JPS63270593A - Water treating device - Google Patents

Abstract

PURPOSE:To form high magnetic flux density and to efficiently improve the quality of a large quantity of water by using the gap between the permanent magnets laminated through an interval control means as a magnetic action passage, and passing water from the central part of the permanent magnet to its periphery. CONSTITUTION:When city water mixed with red rust is supplied to the water storage tank side, the city water is introduced to the hole 18 penetrating the permanent magnet 11 from the inlet passage 41 of a flange 27. In this case, the penetrating hole 18 is closed by a blind patch 51 on the flange 29 side on the outlet side, all the introduced water flows out to the outer periphery of the permanent magnet 11 along the gap 14 between the respectively permanent magnets 11. In addition, the end faces of the adjacent permanent magnets 11 have different shapes,and the city water passing through the gap 14 is exposed in the magnetic flux density having 6,000-7,000 gauss. Namely, the gap 14 functions as a magnetic treating passage, the city water is magnetically treated in the gap 14, and the mixed red rust is reduced to black rust particles which are settled in the storage tank and removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a water treatment device that magnetically improves and purifies the water quality of drinking water, industrial water, wastewater, agricultural water, etc.

[Conventional technology]

Even the tap water provided for drinking may be contaminated with red rust that comes from water supply equipment such as pipes and water tanks, and so-called rust that is brought in from outside. In particular, when the mixed rust is minute red rust particles, the red rust particles do not easily settle and remain suspended in the water. Water in which such red rust particles are suspended is called red water because the particles give it a red color. This red water is not suitable for drinking, and for this reason, for example, chemicals are used, mechanical means such as filtration are employed, or biological means are used.

However, it is difficult to put chemicals to practical use because there are concerns about their effects on the human body, animals and plants after use, and mechanical methods are difficult to implement in actual water supply facilities because the larger the amount of water treated, the higher the equipment cost. There was very little to do. Furthermore, biotechnological methods have not yet been established and are not expected to be adopted at this time. For this reason, recently, a treatment in which water is exposed to a magnetic field, so-called magnetic treatment, has been attracting attention.

An example of water treatment using this magnetic treatment is
There is a water treatment device disclosed in Japanese Patent No. 154188. This water treatment equipment has a plurality of cylindrical permanent magnets with different polarities on the inner and outer circumferential surfaces placed inside a cylindrical space formed by an inner jacket and an outer jacket made of a non-magnetic material. The different poles are housed next to each other through a collar made of a material, and a center member made of a ferromagnetic material and having an outer diameter smaller than the inner diameter of the inner jacket is passed through the center of the inner jacket. An inner flow path is formed between the outer jacket and the outer jacket, and an outer tube made of a ferromagnetic material and having an inner diameter larger than the outer diameter of the outer jacket is concentrically covered with the outer jacket. An outer flow path is formed between the inner flow path and the outer flow path, and the treated water is configured to flow through the inner flow path and the outer flow path.

With this configuration, the lines of magnetic flux emitted from the cylindrical permanent magnet are made to cross the inner flow path and the outer flow path,
It describes the effect that the treated water flowing through the inner and outer channels can be exposed to the magnetic field to the maximum extent possible.

Another known example is a drinking water treatment device disclosed in Japanese Patent Laid-Open No. 61-33290. In this drinking water treatment device, a plurality of hollow disc-shaped permanent magnets magnetized in the axial direction are coaxially arranged in close contact with each other so that the same poles are in contact with each other in a hollow cylindrical body, and the hollow part distributes drinking water. The drinking water flow path is formed in a drinking water flow path, and the surface of the drinking water flow path is coated with a non-magnetic material.

With this configuration, the magnetic fields are mutually compressed, and the magnetic flux density perpendicular to the flow can take the maximum value, and since the fluid passes inside the hollow disc-shaped permanent magnet, the magnetic flux does not expand inside, but over the entire area. It is stated that the space has an effective magnetic flux density throughout the area, and the fluid can be activated effectively, and the reforming function can be performed without the proliferation of bacteria and other bacteria.

Furthermore, as another conventional example, there is a magnetic treatment in which treated water is passed through a flow path consisting of an annular cylinder formed between an inner tube connected to different poles of a permanent magnet and an outer tube surrounding the outer circumference of the inner tube. There is a water treatment equipment that does this. This water treatment device places an inner tube and an outer tube close to each other to form a gap at one end of the flow path, generates a high magnetic flux density in the gap, and causes the treated water to become magnetic when passing through the gap. It is set to be processed.

[Problem that the invention seeks to solve]

By the way, it has been experimentally demonstrated that the magnetic flux density required for water treatment differs depending on the use and purpose. In other words, magnetic treatment with a magnetic flux density of 100 Gauss to 1500 Gauss is effective in promoting the growth of plants including fungi, and magnetic treatment with a magnetic flux density of at least 5000 Gauss or higher is effective in removing red rust and baby kale. is recognized.

However, in the water treatment device mentioned first, lines of magnetic flux are generated between the permanent magnet of the inner north pole and the outer south pole and the axially adjacent permanent magnet of the inner south pole and the outer north pole. The magnetic flux lines will cross the entire surface of the annular cross section of the inner flow path and the outer flow path, but because the distance between different poles becomes longer, the magnetic flux density becomes smaller, and the maximum magnetic flux density is only about 2000 Gauss. I can't. This is because the maximum energy product of a practical permanent magnet, such as a samarium cobalt magnet, is about 10,800 Gauss, so there is a limit to the magnetic flux density that can be obtained with the above configuration in which the north and south poles are far apart. It is. Therefore, in the water treatment apparatus having the above configuration, it is considered that magnetic treatment over a long period of time is required in a closed waterway in order to remove red rust and scale.

In addition, in the second drinking water treatment device, the same poles are connected so that they touch each other and a repulsive magnetic field is used, so contradictory compressed magnetic fields exist continuously, but the obtained The magnetic flux density is small.

Therefore, the effect of removing red rust and scale cannot be obtained. In addition, it is demagnetized due to the repulsive magnetic field, making it unsuitable for long-term use.

Furthermore, in the third-mentioned water treatment device, magnetic treatment is performed when the water passes through the gap, but it is instantaneous, so it is difficult to say that the magnetic treatment is sufficiently performed. In addition, the flow path area becomes smaller at the gap part and the flow path resistance increases, so
There is a problem in that it is difficult to secure a desired flow rate.

This invention was made in view of the above technical background, and its purpose is to be able to obtain high magnetic flux density,
It is an object of the present invention to provide a water treatment device capable of improving water quality by exposing treated water to a high magnetic flux density and subjecting it to magnetic treatment. Another object of the present invention is to provide a water treatment device that can remove not only red rust in treated water but also scale and rust attached to the inner walls of piping. Still another object is to provide a water treatment device that can efficiently perform magnetic treatment on a large amount of treated water without reducing the flow path area.

[Means for solving problems]

In order to achieve the above object, the present invention provides a water quality improvement device that is installed in a running water path and performs magnetic treatment by introducing treated water into a magnetic field. a permanent magnet array formed by stacking different poles facing each other at preset intervals via an interval regulating means made of a non-magnetic material; a casing made of a non-magnetic material that houses the permanent magnet array; The treated water flow path is formed between the outer periphery of the magnet row and the inner surface of the casing, and the through-hole at one end of the permanent magnet row, where the through holes in the center of each permanent magnet are arranged in series. Between an introduction path for introducing water and an adjacent permanent magnet that is located on the other end side of the through-hole and that obstructs the flow passing through the through-hole and that absorbs at least most of the treated water introduced into the through-hole. It is configured to include a flow regulating means for causing the flow to flow out from the gap toward the outer circumference of the permanent magnet, and a discharge path for guiding the treated water that has flowed out of the permanent magnet array and is regulated by the flow regulating means to the outside of the casing.

[Effect]

According to the above means, if the distance between the permanent magnets is set to 111 to 2, for example, a magnetic flux density of about 6000 Gauss to 7000 Gauss can be easily obtained with a permanent magnet having an energy product of about 10800 Gauss. The treated water is introduced into the through-hole in the center of the housing, the flow direction of the treated water is changed by the flow regulating means, and at least the majority of the treated water flows out toward the outer periphery of the permanent magnets along the gaps between the respective permanent magnets. , it becomes possible to magnetically treat treated water by exposing it to high magnetic flux density. Further, since the total opening area of the gaps between the permanent magnets becomes the flow path area, a large amount of magnetic processing can be performed without increasing the flow path resistance.

As a result, for example, the red rust particles present in the treated water are sufficiently magnetized, and while suspended, they adsorb each other and precipitate as a combined body, thereby making it possible to purify the treated water.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

1 to 3 are for explaining a water treatment device according to an embodiment, in which FIG. 1 is a partially cutaway perspective view of the water treatment device, FIG. 2 is a longitudinal section of the same, and FIG. It is an explanatory diagram showing a flow of treated water.

In FIGS. 1 and 2, the water treatment device 10 mainly includes a permanent magnet array 13 made of a stack of a plurality of permanent magnets 11, and a casing 15 that houses the permanent magnet array 13.

The permanent magnet 11 is an annular disc with a through hole 1 in the center.
7, and both end faces are magnetized to N and S poles, respectively, as shown in FIG. This permanent magnet 11 is a samarium cobalt magnet, and is magnetized to an electromagnetic product of 10,800 Gauss.

As shown in FIGS. 1 and 2, ten such permanent magnets 11 are stacked so that the through hole 17 is coaxial and different poles face each other to form a permanent magnet array 13. There is. This laminate is laminated with holders 19 made of polycarbonate, for example, fitted onto the outer periphery of each permanent magnet 11. It is integrally formed into a ring shape by a spacer portion 21 projecting in the direction and a projecting portion 23 projecting in the outer circumferential direction as treated water flow path forming means. By changing the thickness of the spacer portion 21, the distance W between adjacent permanent magnets 11 can be freely set. In this example, the distance RW is set to 1.5 mm in consideration of magnetic flux density and flow path area. This spacing is optimally between 11 meters and 2 meters wide, but generally a spacing between 0.5 m and 511 meters is chosen. Considering the magnetic flux density, it is advantageous to have a magnetic flux density of 0.5 u or less, but the attraction force of the permanent magnet 11 becomes too strong, which not only makes assembly technically difficult, but also causes damage to the eyes due to dust and rust in the treated water. This may cause clogging and is not practical.

In this way, the permanent magnet array 13 formed by stacking the holders 19 can be handled as one unit by mutual attraction force without any particular fixing device, but if necessary,
An insertion hole may be formed in the protruding portion 23 and the protruding portion 23 may be fixed with a bolt and a nut.

The casing 15 consists of a cylindrical cover pipe 25, a flange 27 on the treated water inlet side, and a flange 29 on the treated water outlet side. By screwing together the threaded portions 35° and 37 screwed onto the inner periphery of the cover pipe 25, the king becomes one piece. At this time, a backing 39 is sandwiched between the end face of the cover pipe 25 and the end face of each flange, making the casing 15 watertight.

The flange 27 on the treated water introduction side also has an introduction path 4 for introducing treated water from outside the casing into the casing.
1 is formed coaxially with the through hole part 18 consisting of the through holes 17 arranged in series, and the flange 29 on the treated water outlet side has an outlet path 43 for guiding the treated water from inside the casing into the casing. It is formed coaxially with the section 18. These flanges 27 and 29 are each made of magnetic soft iron, and a connecting member 46 having a pipe thread 45 screwed therein as required is welded to the outer periphery of the path portions 42 and 44 that protrude from the flange portion. It is connected to a running water path outside the water treatment device 10 via the member 46 .

In this embodiment, the cover pipe 25 is made of transparent polycarbonate, and its inner diameter is set to be large enough to allow the protrusion 23 of the holder 19 to be inserted therein. As a result, when the permanent magnet array 13 is inserted into the casing 15, a treated water flow path 47 is formed between the inner surface of the cover pipe 25 and the outer peripheral portion of the holder 19 other than the protrusion 23 of the holder 19. . Further, since the cover pipe 25 is transparent, the gap 14 between the permanent magnets 11 and the treated water flow path 47 can be visually recognized from the outside.

Further, a blind plate 51 made of magnetic soft iron and serving as a flow regulating means is attached to the end face 49 of the permanent magnet array 13 on the lead-out side flange 29 side so as to close the through hole portion 18. This blind plate 51 has the through hole portion 1
8 is closed, and the treated water flow path 47 is not closed. In this embodiment, the portion corresponding to the protrusion 23 of the holder 19 extends in the outer circumferential direction,
The structure is such that the end face of the flange 29 on the outlet side abuts and presses down. However, for example, as described above, an insertion hole is formed at a position corresponding to the insertion hole inserted into the protrusion 23 of the holder 19, and these holders I9 are fixed to the permanent magnet array 13 through bolts and nuts. It's okay.

Moreover, on the flange 27 side on the introduction side of the permanent magnet array 13,
A disc-shaped spacer 54 made of magnetic soft iron and having a through hole 53 coaxial with and having the same diameter as the through hole portion 18 is provided. Therefore, the permanent magnet array 13 is held in the casing 15 with the spacer 54 disposed on the introduction path 41 side and the blind plate 51 disposed on the output path 43 side. As a result, the introduction diameter N41 passes through the through hole 53 of the spacer 54 and the through hole portion 18, reaches the gap 14 between each permanent magnet 11 and the treated water distribution path 47, and further reaches the outlet path 43.
A flow path will be formed that leads to.

This water treatment bag RAIO is, for example, as shown in FIG. Connect and use. In this example, the water treatment device 10 installed on the water supply pipe 57 side is mainly for treating rust from the water main, and the water treatment device 10 installed on the drain pipe 59 side is for the water storage tank. This is for treating red rust in the drain pipes and the inner walls of the water pipes leading from 55 to each water supply point in the building.

This will be explained in detail.

That is, when tap water mixed with red rust is supplied to the water storage tank 55 side from the water pipe through the water supply pipe 57, the tap water flows from the introduction path 41 of the flange 27 to the permanent magnet array 11.
is guided to the through hole portion 18 of.

However, since this through-hole portion 18 is closed by the blind plate 51 of the 29 flanges on the outlet side, all the introduced tap water flows in the direction of the outer circumference of the permanent magnet 11 along the gap 14 between each permanent magnet 11. leaks to. At this time, as shown in FIGS. 2 and 3, since the end faces of the adjacent permanent magnets 11 are formed with different polarities, the tap water passing through the gap 14 has an amplitude of at least 5,000 Gauss or more, and most
It will be exposed to a magnetic flux density of 0.00 Gauss to 7000 Gauss. In other words, the gap 14 functions as a magnetic processing path, and magnetic processing is performed in the gap 14.

Then, the magnetically treated tap water reaches the treated water flow path 47 formed between the outer circumference of the holder 19 fitted around the outer circumference of the permanent magnet 11 and the inner surface of the cover pipe 25. The liquid flows out in the longitudinal direction along the inner surface of the blind plate 51 , passes outside the outer circumferential surface of the blind plate 51 , collects in the outlet path 43 , and is discharged from the outlet path 43 into the water storage tank 55 .

The water flow inside the water treatment device 10 at this time is shown in Figures 2 and 3.
It is indicated by the symbol F in the figure.

In tap water that has been magnetically treated in this way, the red rust mixed therein is reduced to become black rust particles 61, and the magnetized black rust particles 61 aggregate in the water storage 56 and precipitate in the water storage tank 55. The water becomes extremely transparent and is supplied to various parts of the building from the drain pipe 59. To explain in more detail,
The main component of red rust is divalent iron oxide F. 203, which is thought to be reduced to F-304 as well as F and O. This F. 04, F, and O are all black rust, and have been reduced from monovalent to ■. And although red rust does not contain ferromagnetic material, black rust contains quite a lot of ferromagnetic material, so when black rust is magnetized, it aggregates and precipitates, causing red water to This will reduce the occurrence.

Incidentally, the black rust that has coagulated and precipitated may be removed using another permanent magnet or the like during building maintenance, for example once a month.

In addition, the water treatment device 10 attached to the drain pipe 59 side further performs magnetic treatment on the water in the water tank 55 that has been subjected to magnetic treatment. It is possible to remove red rust that has appeared on the surface. This is because the red rust on the inner wall of the pipe is reduced by the nascent hydrogen in the magnetically treated tap water, the surface gradually turns into black rust, and this black rust peels off from the red rust and flows out. It is considered.

Therefore, as described above, the water treatment device 10 is connected to the water supply pipe 57.
When attached to the discharge end of the drain pipe 59 and the suction end of the drain pipe 59, it not only prevents red water but also removes red rust from the piping inside the building.

Note that FIGS. 6 and 7 show how this red rust changes into black rust and aggregates. This example is tap water 20j1!
About 7 g of red rust powder was mixed in to make red water, and the red water was forcibly circulated through the water treatment device 10 using a pump. Figure 6 is a microscopic photograph showing the #1 lotus that was initially mixed in. The small particles that appear dotted are red rust powder with a diameter of about 1 μm. Figure 7 is a microscopic photograph of the signal rust contained in the tap water after 3 days, showing black rust with one aggregate having a size of at least 1000 μm or more. Even after stirring, there were many precipitated crystals, and the mixture was no longer red and cloudy.

In this way, when the water treatment device 10 according to the embodiment is attached to the water storage tank 55 of a building, tap water can be subjected to magnetic treatment due to the strong magnetization effect, making it possible to prevent red water and remove red rust. .

Although the above embodiment describes the removal of red rust, it is also possible to remove hardly soluble scale attached to the inner wall of the piping. In this case, the poorly soluble scale is gradually reduced and transformed into soluble scale, which is dissolved in tap water and discharged.

Further, in the above embodiment, ten permanent magnets 11 are stacked to form one permanent magnet array 13 to obtain a high magnetic flux density, but when the number of stacked permanent magnets 11 is small,
As shown in FIG. 4, a magnetic closed circuit is created by short-circuiting the introduction side flange 27 as an N-pole piece that contacts both end faces of the permanent magnet array 13 and the blind plate 51 as an S-pole piece with a yoke 63. and a permanent magnet 11 as a magnetic action path.
It is also possible to increase the magnetic flux density of the gap 4 between them.

In FIG. 4, components that can be considered to be equivalent to those in FIGS. 1 and 2 are given the same reference numerals, and detailed explanation thereof will be omitted.

Further, in both of the above embodiments, the flow regulating means is constituted by the blind plate 51, and all the introduced treated water is guided to the gap 14 between the permanent magnets 11, and is configured to be magnetically treated in the gap 14. However, if the magnetic flux density for magnetization does not need to be low, a small amount of water may be guided directly from the flow regulating means to the outlet path 43 side. In this case, it is more effective to provide an outflow hole 65 as shown in FIG. 4 along the inner surface of the through hole 17 so that the treated water can be led out.

As described above, according to the above embodiment, (1) the permanent magnet 11 in which both end surfaces of the annular disk are magnetized;
Since a large number of sheets are stacked so that different poles face each other at a short distance through the spacer portion 21 of the holder 19, the energy product 10
With the permanent magnet 11 of about 800 Gauss, it is possible to obtain a magnetic flux density of 6,000 Gauss to 7,000 Gauss in the gap 14 as a magnetic action path, and as described in (1), a magnetic flux density of 5,000 Gauss or more can be obtained. Therefore, the area of the through hole 17 can be On the other hand, by adjusting the gap 14 between adjacent permanent magnets 11 and the number of stages (number of sheets) of permanent magnets 11, the flow path area can be made equal, and it is possible to magnetically process the treated water of many legs without increasing the flow path resistance. (2) Since the gap W between the permanent magnets 11 can be freely set depending on the thickness of the spacer portion of the holder 19, a magnetic flux density of about 1500 Gauss, which is suitable for growing plants, can be achieved with the same configuration. can be obtained and applied to any field of magnetic processing; ■ Since the cover pipe 25 is transparent, treatment can be performed before the gap 14 is clogged; ■ In the direction of the outer circumference of the permanent magnet machine 1. Since it is magnetically treated while it flows out, the time it is exposed to the magnetic field becomes longer and sufficient magnetization becomes possible. Since it is integrally formed with the holder 19 fitted to the outer circumference of the permanent magnet 11, there are various effects such as ease of assembly.

Regarding water that has been magnetically treated to date, in other words, magnetically treated water, in addition to the effects of preventing and removing red rust and scale mentioned above and the effect of promoting plant growth, it has the effect of settling suspended solid particles, improving the performance of concrete, It is known that liquid fuel has an effect of improving fuel efficiency, and it goes without saying that the water treatment device of the present invention has effects on all of these.

In particular, since a water treatment device with a magnetic flux density of 5000 Gauss or more has not been put into practical use until now, sufficient effects can be achieved even on objects for which it was thought that the effects were weak until now.

〔Effect of the invention〕

As is clear from the above description, the water treatment device of the present invention uses the gap between the stacked permanent magnets via the spacing regulating means as a magnetic action path, and performs magnetic treatment by flowing from the center of the permanent magnet to the outer periphery. According to the above, since the different poles of the annular permanent magnets having different end faces are opposed at a short distance, a high magnetic flux density can be obtained. Furthermore, since magnetic treatment can be sufficiently performed under high magnetic flux density, it is possible to remove not only red rust floating in the treated water, but also red rust generated on the inner wall of the piping and scale attached to the inner wall.

At this time, since the flow path area is not reduced for magnetic treatment, efficient magnetic treatment of a large amount of treated water is possible.

[Brief explanation of the drawing]

The figures are all for explaining the present invention, and FIG. 1 is a partially cutaway perspective view of a water treatment device according to an embodiment, and FIG.
The figure is a longitudinal sectional view of the same water treatment device, FIG. 3 is an explanatory diagram showing the flow of treated water and the state of magnetized magnetic poles, and FIG. 4 is a longitudinal sectional view of a water treatment device according to another embodiment. , Fig. 5 is an explanatory diagram showing how the water treatment equipment is used, Fig. 6 is a micrograph showing Naka1 filter lotus in the treated water before magnetic treatment, and Fig. 7 shows the precipitate in the treated water after magnetic treatment. Mist 'I' is a micrograph showing a lotus. lO...Water treatment device, 11...Permanent magnet, 13...Permanent magnet row, 14...Gap, 15...Caging, 17...Through hole, 18...Through hole part, 19...Holder, 21...Spacer part, 23...
Projection, 25...Cover pipe, 27.29.
...Flange, 41 ...Introduction route, 43
...Derivation path, 47 ... Treated water distribution path, 51 ... Blind board. Fig. 3 Fig. 4 2163I911 Fig. 5 Helmet [''. Fig. 6 Fig. 7 Procedure Sakaguchi 1 fall (voluntary) June 8, 1988

Claims (11)

[Claims] (1) In a water treatment device that is installed in a running water path and performs magnetic treatment by introducing treated water into a magnetic field, a plurality of annular permanent magnets with opposite end faces made of non-magnetic material are used. A permanent magnet array formed by stacking different poles facing each other at preset intervals via a spacing regulating means, a casing that houses this permanent magnet array, and a space between the outer circumferential side of the permanent magnet array and the inner surface of the casing. the formed treated water distribution path; an introduction path for introducing the treated water into the through hole at one end of the permanent magnet row in which the through holes in the center of each permanent magnet are arranged in series; and the through hole in the through hole. The flow through the through-hole at the other end is obstructed, and at least most of the treated water introduced into the through-hole from the one end flows out from the gap between adjacent permanent magnets toward the outer periphery of the permanent magnet. A water treatment device comprising: a flow regulating means; and a discharge path for guiding treated water regulated by the flow regulating means and flowing out of the permanent magnet array to the outside of the casing. (2) A water treatment device according to claim (1), characterized in that the permanent magnet is formed of a plate-shaped torus. (3) A water treatment device according to claim (1), characterized in that the interval preset via the interval regulating means is 1 mm to 5 mm. (4) A water treatment device according to claim (1), characterized in that each of the permanent magnets constituting the permanent magnet array is independent. (5) The water treatment device according to claim (1), wherein the outer magnetic poles of the permanent magnets located at both ends of the permanent magnet array are short-circuited by a magnetic material. (6) Claim (1) is characterized in that the flow regulating means is constituted by a blind plate that prevents all of the treated water introduced into the through-hole from passing through the through-hole. Water treatment equipment. (7) The water treatment device according to claim (1), wherein the flow regulating means includes an outflow hole that allows some of the treated water to flow out along the inner edge of the through-hole portion. (8) A water treatment device according to claim (1), characterized in that at least a portion of the casing is transparent. (9) A water treatment device according to claim (1), characterized in that the lead-out path is arranged in a direction substantially perpendicular to the end face of the permanent magnet array. (10) The water treatment device according to claim (1), wherein the magnetic flux density between adjacent permanent magnets is at least 5000 Gauss or more. (11) Claim (1) is characterized in that the spacing regulating means is formed integrally with a holder that holds each permanent magnet with a flow path secured between it and the inner surface of the casing. water treatment equipment.