JPS6327791Y2 - - Google Patents

Description

[Detailed explanation of the invention] Industrial field This invention removes magnetic dust, etc. floating in the atmosphere.
The present invention relates to a dust collection plate that attracts and collects dust using the magnetic force of a permanent magnet, and particularly relates to a dust collection plate that is small and has high dust collection efficiency.

Background technology Magnetic dust, etc. floating in the atmosphere can be removed by magnetic force.
Conventionally, devices for attracting and collecting dust have been constructed by placing a matrix made of thin ferromagnetic wires in a magnetic field, creating a high magnetic field gradient, and causing magnetic fine particles introduced into the magnetic field in the atmosphere to be attracted to the thin magnetic wires. Are known.

In addition, a dust collection device (1983-1983), in which plate-shaped permanent magnets housed in plastic bags are suspended at predetermined intervals in a dust collection hood, and the permanent magnets attract dust from machine tools, etc. 107149) is proposed.

Furthermore, as a device for adsorbing and removing iron in liquid such as lubricating oil, a simple structure in which permanent magnets are appropriately arranged within a non-magnetic case is known.

A configuration that utilizes a high magnetic field gradient has a strong attraction force, but the configuration of the device is complicated, and
The above-mentioned dust collectors and those for liquids have a simple configuration, but there is a problem that their ability to attract and collect dust in the atmosphere is weak. A dust collection plate was desired.

Purpose of the invention This invention aims to create a dust collection plate with a simple structure and high ability to attract and collect stray magnetic dust in the atmosphere.
-The purpose is to create a dust collection plate with a structure that makes the most effective use of R-based permanent magnets.

Structure of the device This device has a prismatic shape in which an even number of pieces are arranged in parallel with a non-magnetic material interposed between them, and the maximum energy product is
Fe-B-R permanent magnet of 30MGOe or more (R is Y
(at least one kind of rare earth element containing) is fixed to one end surface of a plate-like yoke, and is provided with a non-magnetic material cover that covers at least the above-mentioned prismatic permanent magnet. .

This invention is a dust collection plate that exhibits a magnetic adsorption force equal to or higher than that of the conventional dust collector that applies a high magnetic field gradient, and for this purpose, Fe-B-R with a maximum energy product of 30 MGOe or more is required. system permanent magnet (R is at least one rare earth element including Y)
is necessary.

Fe−B− with a maximum energy product of 30MGOe or more
R-based permanent magnets are R8 atomic% to 30 atomic% (R is Y
Permanent magnets whose main components are at least one rare earth element containing obtained more than
This design is ideal for permanent magnets.

The permanent magnets may be arranged in any configuration as long as prismatic permanent magnets are arranged in parallel with a non-magnetic material interposed between them and a plate-shaped yoke is connected to one end of the permanent magnet group. It is best to arrange an even number of magnets in parallel, such as 2, 4, or 6, and it is most desirable to arrange two magnets in parallel in order to effectively utilize the excellent magnetic properties of Fe-BR permanent magnets.

In addition, the dust collection plate of this invention is equipped with a non-magnetic material cover that encloses at least a permanent magnet, and can be used in a variety of ways, such as being used as a single plate, or accommodating and arranging multiple plates in a predetermined duct. However, in order to facilitate the removal of magnetically attracted magnetic dust, it is desirable to cover the dust collection plate with a non-magnetic sheet or bag material such as a vinyl sheet or paper bag.

Preferred Embodiment of the Invention In this invention, it has been found that the following conditions are effective in minimizing the amount of the permanent magnet used, miniaturizing the device, and improving the magnetic adsorption dust collection efficiency.

When there are two prismatic permanent magnets; The ratio of the width W to the height Lm of the prismatic permanent magnets provides a synergistic effect with adjacent magnets, so if it is outside the range of 2.5 to 4.0, the permanent magnets should be made larger. Therefore, it is not possible to expect a significant improvement in the magnetic adsorption force.

That is, W/Lm is preferably in the range of 2.5 to 4.0.

The ratio between the thickness t of the non-magnetic material interposed between the magnets and the height Lm of the prismatic permanent magnet is such that the non-magnetic material has the effect of dispersing the magnetic flux generated from the permanent magnet magnetic pole surface far away, but Increasing the spacing is not preferable because it weakens the mutual effect of adjacent magnets. Therefore, it is desirable that t/W=0.04 to 0.06.

A plate-shaped yoke fixed to one end of a prismatic permanent magnet contributes to improving the magnetic force of the permanent magnet, but if the yoke thickness T is too thick, the entire plate becomes large and the obtained magnetic force improvement is small, so the permanent magnet height For Lm,
T/Lm=0.3-2 is desirable.

When there are four prismatic permanent magnets, the following conditions are desirable for the same reason.

W/Lm=1.3-2.8 t/W=0.04-0.06 T/Lm=0.3-2 Disclosure of the invention based on the drawings FIG. 1 is a longitudinal cross-sectional view of a dust collecting plate according to this invention.

The dust collection plate is a pair of prismatic Fe-BR
The system permanent magnets 1, 1 are fixed on a plate-shaped yoke 3 with a small non-magnetic material 2 interposed between them.
It has a structure in which a non-magnetic material cover 4 made of a stainless steel plate is fixed to the side surface of the plate-shaped yoke 3 so as to cover the upper surfaces of the Fe-BR-based permanent magnets 1, 1 and the plate-shaped yoke 3, The upper surface of the non-magnetic material cover 4 serves as an attraction surface.

In the above configuration, the permanent magnet 1 has a width W20 mm.
A permanent magnet with dimensions of × height Lm 7 mm × length 50 mm and a maximum energy product of 30 MGOe is used, and a permanent magnet with a thickness of t1 mm is used for the non-magnetic material 2, and a thickness of T9 is used for the yoke 3.
When using a board with dimensions of mm x width 48 mm x length 55 mm,
The dust collecting plate according to this invention exhibited three times the adsorption and dust collecting power compared to the dust collecting plate of the comparative example, which was manufactured in exactly the same manner except that ferrite magnets of the same size were used as the permanent magnets.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of the dust collecting plate according to this invention. 1... Fe-B-R permanent magnet, 2... Non-magnetic material, 3... Plate yoke, 4... Non-magnetic material cover.

Claims (1)

[Scope of utility model registration request] A prismatic Fe-B-R permanent magnet (R is at least one rare earth element including Y) having a maximum energy product of 30 MGOe or more and having an even number arranged in parallel with a non-magnetic material interposed therebetween. A dust collection plate characterized in that a non-magnetic material cover is fixed to one end surface of a plate-shaped yoke and covers at least the prismatic permanent magnet.