CS200979B1 - Fluid filtration insertion particularly for filtration of large quantities of circulating oil - Google Patents

Description

The invention relates to a liquid filter cartridge, in particular for filtering large quantities of circulating oil, made of a filter fabric of preferably a needled fabric that is wound on a perforated tube and is inserted into the outer casing of the liquid filter.

For fine filtration of larger and large amounts of oil from 50 l / min. above, with a purity of 5 to 40 µm, most commonly used fabrics, as well as metal and non-metallic mesh and paper filter cartridges, inserted in different shaped containers. The filter materials have the shape of an open bag or various shapes such as starfish, concentric annulus etc. The containers have different shapes, but most often they are in the form of perforated metal baskets.

The disadvantage of the known embodiments of the liquid filters is above all their excessive size, requiring a large built-up area, which is disproportionately large in relation to the achieved parameters. This unfavorable relation is also reflected in the costs associated with the production of these devices. Metal mesh filter inserts tend to have a lower filtering ability, the increase of which is solved, for example, by heating the oil of the oil filters to reduce its viscosity and thus the possibility of increasing the flow rate through the filter device. Paper filter cartridges are suitable for lower filtered amounts of oil and are more susceptible to malfunction

200 979 Increased oil flow resistance due to clogging of the filter. There are other types of filters for fine filtration of larger and large amounts of circulating liquids, especially oils. A common feature of all known embodiments of these filters is that they are either too structurally complex, thus failing and costly, or are too large in relation to the filtration performance achieved.

These disadvantages are overcome by the liquid filter element according to the invention. The essence of its construction is that its filter fabric, in particular the needled fabric, is in the form of a closed bag which, before being wound onto a perforated tube, is provided with at least two spacers of spatial mesh over the entire surface. of the bag and the other outside the deployed area of the bag. The perforated tube extends through the interior of the closed bag along its peripheral edge and the outlets therefrom are sealed by a hermetically sealing element.

The advantage of the liquid filter cartridge according to the invention, which is particularly suitable for filtering large quantities of circulating oil, is that it makes it possible to reduce the size of the oil filters, or to increase the quantity of finely filtered oil per unit time by several times. The filter element according to the invention extends the possibility of using needled fabrics as filter material, since it eliminates the existing drawback of the latter and hence the requirement for excessive filter size.

In the accompanying drawing, an exemplary embodiment of an oil filter having a filtration capacity of 1000 rpm for approximately 400 mm diameter and 1000 mm length is shown schematically.

Fig. 1 is a vertical cross-section of the oil filter with a built-in filter element; Fig. 2 is a partial vertical cross-section of the filter element; Fig. 3 is a cross-section of the oil filter in plane AA of Fig. 1; Fig. 5 is a cross-sectional view taken along line BB in Fig. 4.

A filter insert 1 made of needled fabric is inserted sealed to the bottom of the filter body 6 (FIG. 1). 1 /, which is provided with an inlet orifice g and an outlet orifice 4. The filter fabric of the filter element 1 / fig. 2), which in the deployed state has the form of a hermetically sealed bag g / fig. 4 and 5), it is spirally wound onto the perforated tube 6 before being inserted into the filter body 2 (FIG. 3), which extends along the edge of the deployed bag g and the outlets therefrom are sealed with tape sleeves J / fig. 4 /. Inside the bag g is inserted a first spacer 8 of metal spatial mesh and on the outside of the unfolded bag g a second spacer g / fig. The unfolded bag g is spirally wound onto the perforated tube 6 in the direction / fig. 5 / ·

In the exemplary embodiment, the oil to be filtered is preferably fed through the inlet port g in the S direction, passes through a predominant part of the flow area of the filter element 1 into the perforated tube 6 and is discharged from the outlet port 4 therefrom.

200 979

Claims (1)

SUBJECT OF THE INVENTION Liquid filter element, in particular for filtering large and large amounts of circulating oil, made of a filter cloth 3 preferably of a needled fabric, which is wound on a perforated tube and is inserted into the outer casing of the liquid filter, characterized in that the filter cloth of the filter element 1) is formed in the form of a closed bag (5) which is provided with at least two spatial spacers (8, 9) of spatial mesh over the entire developed area before being wound on the perforated tube (6), of which the first spacer (8) is placed within the sealed bag (5) and the second spacer (9) is positioned outside the unfolded area of the bag (5), the perforated tube (6) extending inside the sealed bag (5) along its edge and sealed therefrom by a hermetically sealing element; eg with a tape sleeve (7).