JPS6119772Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is applicable to iron, nickel, etc. in condensate systems, water supply systems, heater drains, etc.
The present invention relates to a matrix for a high-gradient electromagnetic filter that is effectively applied to the removal of so-called (cladding) containing copper as a main component.

Conventional high-gradient electromagnetic filters are constructed by filling a pressure vessel (canister) with a matrix of ferromagnetic metal fibers, surrounding which an electromagnetic coil is placed, and applying a direct current to the coil to generate a magnetic field. Therefore, the matrix is magnetized to generate a high gradient magnetic field, which effectively traps crud in condensate systems, water supply systems, etc.

When using the above-mentioned filter, the washing water is normally flowed upward, and the matrix washing is carried out downward flow, and the washing is carried out for a preset period of time.
Alternatively, it can be performed automatically based on the pressure loss signal of the matrix. First, the inflow condensate is switched to bypass, then the energization to the excitation coil is stopped, the matrix is demagnetized, and the superfluous cleaning water held in the canister is discharged from the system together with the trapped particles in a short time. . This process is repeated to complete cleaning, and after the cleaning is completed, the filter is automatically switched to water flow.

However, the conventional filters have drawbacks such as the density of the matrix is not uniform and the crud collection rate varies depending on the part of the matrix.

The present invention was proposed to eliminate these drawbacks, and is characterized by having a substrate made of ferrite-based SUS430 with a large number of small through-holes formed on a sloped inner peripheral wall. This relates to a metal filter for a high gradient electromagnetic canister.

As described above, the filter according to the present invention has a substrate 1 made of ferrite-based SUS430 with a large number of small through holes 2 whose inner circumferential surface 2a is sloped. A sharp portion 2b is formed at the edge, and a particularly strong magnetic field is generated in the portion 2b, so that the crud in the superfluous cleaning water passing through the small through hole 2 is reliably captured by the sharp portion 2b. It is something that

In addition, the filter according to the present invention is ferrite-based.
Since a large number of small through holes 2 for the filter are drilled in the metal substrate 1 made of SUS430, by uniformly drilling the small through holes 2 in the substrate 1, the filter of the present invention can be uniformly formed over the entire surface of the filter. It is capable of trapping crud in superfluous washing water.

Next, embodiments of the present invention will be described.

A substrate made of ferrite SUS430 with a thickness ranging from several microns to several millimeters is manufactured using a glass mold by a microsieve method with small through holes having a diameter of approximately 5 microns to 200 microns.

In other words, there is a glass model on the front side in which countless small holes with a pitch and tolerance of a few microns are drilled, and a back glass model in which countless small holes with different diameters are drilled concentrically with the same small holes. The substrate is sandwiched between the mold and the substrate, and treated with a chemical solution such as ferric chloride, hydrochloric acid, nitric acid, oxalic acid, etc. alone or in combination, and then the substrate is formed into small particles using a known microsieve method. This is for drilling a through hole. In this case, it is most desirable that the pore area ratio be 50% or more and up to 75%.

In the embodiment shown in FIGS. 1 and 2, the inner circumferential surface 2a of the small through hole 2 formed in the substrate 1 is formed into a sloped surface whose diameter gradually increases as it reaches the bottom. The lower end edge of the through hole 2 is formed into a sharp portion 2b. The diameter of the large diameter part of the small through hole 2 is 80μ, the diameter of the small diameter part is 60μ, and the pitch is 100μ.

In the embodiment shown in Figs. 3 and 4, the inner peripheral surface 2a of the small through hole 2 is formed into a sloped surface whose diameter gradually increases upward, and a sharp portion 2b is provided at the upper edge of the small through hole 2.

In the embodiment shown in FIGS. 5 and 6, the substrates 1 of both of the above embodiments are superimposed, and a sharp portion 2b is provided in the middle of the small through hole 2.

[Brief explanation of the drawing]

1, 3, and 5 are enlarged plan views of small through holes of an embodiment of a metal filter for a high-gradient electromagnetic canister according to the present invention, and FIGS. 2 and 4 respectively.
6 and 6 are longitudinal sectional views thereof, respectively. 1... Ferrite SUS430 substrate, 2... Small through hole, 2a... Inner peripheral surface of small through hole, 2b... Sharp portion.

Claims (1)

[Claims for Utility Model Registration] (1) A matrix for a high-gradient electromagnetic filter, characterized in that the inner circumferential wall is composed of a substrate having a plurality of small through holes formed on a sloped surface. (2) The substrate material is ferrite stainless steel.
A matrix for a high gradient electromagnetic filter according to claim 1, which is made of SUS430. (3) From 100 substrates with a thickness of 30μ to 200μ
2. A matrix for a high gradient electromagnetic filter according to claim 1 or 2, characterized in that 2000 sheets are laminated.