JPS5854847B2 - filter cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filter cylinder suitable for oil operation in machine tools, internal combustion engines, air compressors, roll mills, etc., oil filtration in lubrication systems, and filtration of liquids such as chemicals and petroleum.

Some of the lubricants generally used for machine tools, internal combustion engines, etc.
Impurities that get mixed in during use include a mixture of large particles and fine particles, but these impurities cause mechanical wear and significantly shorten the life of the machine, so these impurities must be removed. Various methods have been adopted for this purpose.

For example, when filtering circulating oil in an internal combustion engine or the like, a filter cylinder is used to maintain the life of the engine by removing impurities.

As shown in Fig. 1, the filter cylinders used for the above purpose are made of filter paper 21 punched out into an annular shape as a filter medium, and filter paper 22 with a higher density than this filter paper punched out into an annular shape. The honeycomb-shaped outer openings 2 are stacked alternately, and openings are provided alternately at regular intervals, and the filtrate is provided at regular intervals on the outer periphery.
3, and is filtered through a filter paper through the honeycomb-shaped inner openings 24 provided at regular intervals to the inner diameter flow path, and both coarse particles and fine particles of the stock solution entering from the honeycomb-shaped outer openings pass through the filter medium. One drawback is that the filter paper gets clogged quickly because it is collected on the surface of the filter paper, and the other problem is that the load on the surface of the filter concentrates on areas with little resistance, making it impossible to filter uniformly over the entire surface of the filter. .

In order to eliminate these conventional drawbacks, the present invention provides a density gradient nonwoven fabric having an intermediate density between a relatively low density nonwoven fabric, a high density nonwoven fabric, and the above-mentioned amphibodi woven fabric. Several different types of annular plates are punched out, and one or more of the above annular plates are laminated and integrated to form a cylindrical structure, thereby solving the conventional drawbacks.

Generally, impurities in dust-containing fluids are filtered by contact collection or diffusion collection.In the case of diffusion collection, the efficiency decreases as the flow rate increases, and the collected dust As the amount increases, re-scattering becomes more likely to occur and filtration efficiency decreases, making it impossible to achieve the purpose of filtration.

Therefore, the conditions for efficient filtration are (1) uniform introduction of the fluid to be filtered onto the surface of the filter medium;

(2) The filter medium is formed with a density gradient so that dust is filtered from coarse to fine particles.

To achieve this, a filter medium that has the function of rectifying the fluid introduced onto the surface of the filter medium is required, and in order to satisfy item (2), the lower layer is dense and the upper layer is coarser. It is constructed by incorporating density gradient type filter media with different fiber types and fineness into the mirror layer.

Next, the configuration of the present invention will be explained with reference to the drawings.

Figure 2 shows a low-density nonwoven fabric 3, which is composed of dog fibers 1 with a fineness of 15 to 500 deniers and a resin binder 2 that binds the fibers, and is resistant to fluids. Density with low filtration resistance (0, 2, 9/ff
1 or less) are used.

Figure 3 shows a highly dense non-woven fabric 4, which is packed with fibers or a resin binder to prevent fluid from seeping through. is 0.2 g/crit or more.

FIG. 4 shows a density gradient nonwoven fabric 7 having a density that is approximately medium to that of the nonwoven fabric shown in FIGS. It is sewn to make it rough.

The nonwoven fabric 7 is formed by creating a web by selecting and combining the types and fineness of fibers, and the fineness used is 0.
The fibers range from 5 to 20 deniers, and the upper layer is preferably made of highly elastic polyester, acrylic fiber, etc., and the lower layer is preferably made of rayon, etc., and usually has an average density of 0. o 5-0.25 g/crj
, using non-woven fabric.

FIGS. 5 to 10 show the inner diameter and outer diameter (a) of the nonwoven fabrics of different densities that constitute the filter cylinder.

b) Five types of annular punched plates having (a, c) (a, d) (c, b) (d, b) are shown, and the radius length of the inner diameter and outer diameter of each of the annular plates is a, b, c.

There is the following relationship between d.

a>c)b, a)d)c a-b-(d-b)+(a-d) Figure 5 shows the mirror layer of the filter tube using the density gradient type nonwoven fabric 7 shown in Figure 4. Figures 13 to 15 show the constituent substrate C.
This layer constitutes layer C of the filter cylinder shown in the figure, and is a layer that substantially filters and collects impurity particles.

FIG. 6 shows a filter tube forming substrate 9 formed by punching out the high-density nonwoven fabric 4 shown in FIG. 3 into a ring shape, and constitutes layer A of the filter tube shown in FIG. 15.

The substrate serves as a fluid shield, and materials such as the nonwoven fabric, synthetic resin, metal, foamed plastic, and rubber can also be used.

FIG. 11 shows a substrate U constituting a filtration barrel mirror layer in which a small-diameter high-density non-woven fabric punched circular plate 11 of FIG. 10 is fitted into the inner diameter of the low-density non-woven fabric punched circular plate 8 of FIG. 13th
This constitutes the B layer of the filter cylinder shown in FIGS.

Instead of the high-density nonwoven fabric punched annular plate 11, an annular plate made of a material such as synthetic resin, metal, foamed plastic, or rubber may also be used.

FIG. 12 shows an integrated filtration system in which a low-density nonwoven ring-shaped plate 13 punched out with an outer diameter a and an inner diameter shown in FIG. The substrate 15 forming the mirror layer of the cylinder constitutes the D layer of the filter cylinder shown in FIG.

The ring-shaped plate 14 punched from the high-density non-woven fabric serves as a fluid shield, and a ring-shaped plate made of the non-woven fabric, synthetic resin, metal, foamed plastic, rubber, etc. may also be used.

FIG. 13 shows a filter tube formed into a cylindrical shape by appropriately combining four of the above-mentioned filter tube constituent substrates A to D and laminating them into one piece.The internal structure of the filter tube is as shown in FIGS. 14 and 15.
Layer A 9, which serves as a fluid shield, is arranged on the lower surface layer, Layer B performs a rectifying action on the filtered fluid from the upper layer, and Layer C performs a filtration action to completely collect and filter even the minute impurity particles contained in the fluid. It is constructed by repeating B, C, D, and C of the D layer, which rectifies the impurity-filtered fluid and discharges it to the outside, with one unit e, but of course it is not limited to this constituent unit, but can also be used as a filtered body. The structure can be arbitrarily rearranged depending on the type of fluid.

In addition, when laminating and integrating each layer of the annular plates A to D constituting the above-mentioned filter cylinder, the thermosetting resin fixed to the fiber layer of each annular plate is in an uncured state. Heat and harden the laminated state to integrate.

At this time, if the amount of uncured resin deposited is 30% or more, an integrated filter tube can be obtained simply by applying pressure and heating, but if a filter tube with a low density as a whole is to be constructed, the amount of resin must be increased. could not be increased, and the amount of adhesion was 30%.
In the following cases, in order to achieve complete interlayer adhesion, it is necessary to activate the uncured resin before laminating.

The method for this activation is to spray an uncured resin stagnation agent on the annular plate surface, or to spray a resin diluted solution of the same quality as the above resin on the annular plate surface, and to apply a predetermined amount of the resin while laminated and pressurized. The method used is to heat them for a period of time to integrate them.

When using the filter cylinder configured as described above, fluids such as oil, water, acid agents, etc. to be filtered enter from the inlet 16 and are filtered toward the inner diameter side as shown in FIGS. 13 and 14, and from the outlet 17. be discharged.

FIG. 15 illustrates this state in more detail.

The fluid to be filtered, consisting of laminar flow, turbulent flow, and swirling flow, flows in from the inlet 18 of the low-density nonwoven fabric layer at a pressure P, but the pressure at the center hole 19 is PO, where P>Po, and the fluid has a rectifying effect. It flows from the layer with the least resistance of the laminated filter medium, which also has the function of

The inflowing fluid moves in the direction of the arrow, and is blocked by the high-density nonwoven fabric layer 11 on the inner diameter side, which has a large resistance, making it difficult to penetrate, so the surface layer has a relatively low density, and the density increases toward the lower layer. It is evenly distributed and flows into layer C, which is made of density gradient type nonwoven fabric, passes through the arrow opening and reaches layer 0 10, where it is blocked by the high density nonwoven fabric 14 on the outer diameter (inlet) side. The filtrate flows along arrow 2 toward the center hole 19 where the pressure is low, is discharged from layer D, and is filtered.

In addition, the fluid moving in the direction of arrow C in the C layer has a pressure P on the inlet side, and because this pressure is high, all the fluid flows toward the arrow port,
Go in the second direction.

Similarly, the filtration action is performed in the D layer from the 68th outer diameter layer of the filter cylinder as described above.

The present invention will be explained below with reference to Examples.

Example First, each nonwoven fabric base material constituting a filter cylinder was manufactured as follows.

(1) Low-density nonwoven fabric A fiber web made by mixing nylon fibers of 100 denier, cut length 51 mm, 55 parts, and nylon fibers 2 denier, cut length 38 mm, 45 parts, with a basis weight of 80 g/d, is coated with a binder based on NBR latex using the dipping method. The solid amount is 50
After drying and vulcanization, in a second step, a water-soluble phenolic resin initial condensate was applied to the nonwoven fabric in a solid amount of about 30%, and the product was rolled up in an uncured state that was dry to the touch to give a product basis weight of 155. g/m3 thickness 2 mm, apparent density 0.0
8g/CI! A nonwoven fabric was obtained.

(2) Fiber web made by mixing 10 parts of high-density nonwoven polyester fiber, 6 denier, 5-1 mm cut and 90 parts of polyester fiber fabric, 5 denier, 64 strength cut, with a basis weight of 250 g/NB by dipping method.
A binder containing R latex as a main ingredient was attached to the fibers in a solid amount of 45%, and after drying and vulcanization, the same procedure as in (1) above was carried out to adhere 30% of the solid amount to this nonwoven fabric in an uncured state. Winding, basis weight 472g/mz thickness 2mm, apparent density 0
A nonwoven fabric weighing 1.24 g/- was formed.

(3) The upper layer of density gradient nonwoven fabric is 50 parts of polyester 6 denier 38 mm cut;
The middle layer of the 80 ji/m" fiber web is made of 50 parts of polyester 3 denier, 38 strength, and has a basis weight of 60, which is a mixture of 60 parts of polyester 3 denier, 38 m 11L strength, and 40 parts of rayon 3 denier, 38 strength.
A 3-layer laminated web consisting of a fibrous web with a weight of 609/rrr' and a lower layer made of a fibrous web with a basis weight of 609/rrr', which is made by mixing 30 parts of polyester 3 denier, 38-inch cut, and 70 parts of rayon 3-denier 38-inch cut. is immersed in a binder solution containing acrylic acid ester polymer as the main ingredient to form a nonwoven fabric with a solid resin adhesion of 60% on the fibers, and then water-soluble in the second step as in (1) above. Approximately 30% of the initial condensate of phenolic resin was applied, and the uncured material was rolled up until it was dry to the touch, with a basis weight of 374 g/m and a thickness of 2 m.
A nonwoven fabric with an apparent density of 0.199/cril was obtained.

(4) Punching and forming process Each of the nonwoven fabrics obtained in the above (IX2X3) is punched to a predetermined outer diameter and inner diameter to form a ring-shaped punched product as shown below.

The low-density nonwoven fabric is made of a ring-shaped plate with an outer diameter of 50 mm and an inner diameter of 24 mm.
(Fig. 7, 10) and one with an outer diameter of 40 mmφ and an inner diameter of 16 mm (Fig. 8, 13), and the density gradient type nonwoven fabric has an outer diameter of 50 iiφ,
The inner diameter is 16 mm (Fig. 5, 8), and the outer diameter of the high-density nonwoven fabric is 50 mm.
mmφ, inner diameter 16mmφ (Fig. 6 9) and outer diameter 24m1φ
, inner diameter 16 mm φ (Fig. 9 14) and outer diameter 50 mrttφ,
Six kinds of annular plates with an inner diameter of 40vtvtφ (Fig. 10, 11) are formed, and among them, annular plates 10 and 11, and 14 and 13 are combined and fitted into one body, 12B and 15D, respectively.

Four filter cylinder constituent substrates of 8C and 9A are obtained.

Next, as shown in FIGS. 14 and 15, a high-density nonwoven fabric is placed at both ends as layer A, followed by layers B and C.

D and C were repeatedly laminated in the following order as one unit.

During lamination, in order to activate the uncured resin, a dilute solution of solvent or curable resin is applied in the amount necessary to activate the surface, and then the layers are immediately laminated and tightened with metal fittings to a certain thickness. In this state, heat treatment was performed at a humidity of 100 to 150° C. for 2 to 5 hours to harden the resin, and at the same time, each layer was bonded to form an integrated filter cylinder.

As described above, according to the present invention, a filter cylinder with excellent water resistance, anti-slagging agent resistance, and heat resistance can be obtained, and it can be used in filtering circulating oil of internal combustion engines, filtration of paint, and filtration of transformer oil using conventional filter paper. Compared to the manufactured filtration cylinder, due to its structure, the fluid to be filtered is rectified and distributed uniformly in the wave layer, so there is no clogging and the service life is much longer.A part of the filtered liquid is in the low-density wave layer. Filtration is performed by repeating the dense gradient mirror layer, and it has various effects such as being able to filter fine particles to coarse particles efficiently and uniformly.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a filter cylinder showing a conventional example, Figures 2 and 3.
4 are cross-sectional views of a low-density nonwoven fabric, a high-density nonwoven fabric, and a density gradient type nonwoven fabric having an intermediate density between the two, respectively, which are used in the present invention. Fig. 5 is a plan view of a stamped annular plate C of density gradient type nonwoven fabric that constitutes the wave layer of the filter cylinder of the present invention, and Fig. 6 is a plan view of a stamped annular plate A of high density nonwoven fabric that constitutes the filter cylinder. . Figures 7 and 8 are plan views of circular plates punched from the same low-density nonwoven fabric with different inner diameters and outer diameters, respectively, and Figures 9 and 10 are plan views of circular plates punched from the same high-density nonwoven fabric with different inner diameters and outer diameters, respectively. Plan view of annular plate. Fig. 11 is a plan view of the annular plate B that constitutes the wave layer of the filter cylinder made by combining the annular plates shown in Figs. 7 and 10, and Fig. 12 is the annular plate shown in Figs. 8 and 9. FIG. FIG. 13 is a perspective view showing one example of the filter cylinder of the present invention, and FIG.
The figure is a sectional view taken along the Y-Y line in Figure 13, and Figure 15 is a cross-sectional view of Figure 1.
FIG. 4 is a partially enlarged view taken along line X-X in FIG. 4; 1...Fiber, 2...Resin binder, 1.
...Low density nonwoven fabric, 4...High density nonwoven fabric, 5...Lower layer, 6...Upper layer, E...
... Density gradient type nonwoven fabric, 8... Density gradient type nonwoven fabric filtration tube constituent substrate C, 9... High density nonwoven fabric filter tube constituent substrate A, 10, 13... Low-density nonwoven fabric circular plate, 12...Filter cylinder constituent substrate B115...
...Filter tube configuration board, 16, 18... Inlet, 17... Outlet, 19... Center hole.

Claims (1)

[Claims] 1 Annular plate formed by fitting a high-density nonwoven annular plate onto the inner diameter surface of a low-density nonwoven annular plate B1 Density gradient type nonwoven fabric annular plate C and a high-density nonwoven annular plate fitted onto the outer diameter surface of the low-density nonwoven annular plate Ring-shaped board and density gradient nonwoven fabric ring-shaped board C
High-density annular plates A are arranged and laminated as fluid shielding layers on the upper and lower surfaces of a cylindrical body, which is formed by laminating a plurality of sets of filtration layer-constituting substrates formed by sequentially laminating annular plates C and B in contact with each other. , a filter cylinder characterized by being integrally molded.