RU30282U1 - Filter for liquids and gases - Google Patents

Description

Filter for liquids and gases

The utility model relates to techniques for cleaning liquids and gases and is intended for use in the implementation of separation processes, mainly in diesel fuel of vehicles.

In the fuel systems of cars with diesel engines, the most widely used filters for fine fuel cleaning are filters with replaceable filtering elements of the surface type. In this case, the most traditionally used filters are filtering star-shaped curtains made of special filter papers and cardboard enclosed in a perforated shell, which are obtained by bending the corrugated tape around the inner perforated tube and gluing its ends (SU 808100 A, 02.28.1981).

However, filters with star-shaped filtering elements are characterized by a small filtering surface and low resource.

Known filters for cleaning fuel and oil in internal combustion engines with an increased filtration surface, in

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which the filter curtain located between the shell and the outlet tube is made with corrugations, spiral

oriented relative to the filter axis, i.e. having a curvilinear bend in a plane perpendicular to the axis (US 2801009 A, 07/30/1957; SU 1255165 A1, 09/07/1986; SU 1761201 A1, 15.09.1992 prototype).

A disadvantage of the known filters is associated with low filtering efficiency due to the non-optimal choice of their main dimensions and parameters of the filtering curtain.

The objective of the utility model is to improve the design of such filters with increased efficiency and resource.

The problem is solved in that in a filter for liquids and gases containing an outer perforated shell and an inner perforated outlet pipe closed by end caps, and also located between the shell and the outlet tube, a filter curtain with corrugations having a curved bend in the plane perpendicular to the axis , - for a given value of H characterizing the ratio of the filter height H to its diameter D, the diameter D is selected in accordance with the ratio

D 1.857 V, p

Ar „.N. (O, 2H., - 0.52-10-0 (1)

where: VTH is the nominal consumption of filtered fuel

(filter capacity), VT - kinematic viscosity, PT - density, Arn - pressure drop (Arn 10 kPa), nominal filtration fineness, diameter d of the outlet tube is defined as

d D / 2, (2)

and the width of the corrugation h of the filter curtain in a free state corresponds to the expression

h. (f) .k ,, (3)

where kh is the coefficient of increasing the width of the spiral corrugation along

relation to direct.

Partial essential features of the utility model also contribute to the solution of the problem.

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The corrugation step t of the filtering curtain is selected according to the criterion of the maximum conditional resource T with the determination of the inflection point of the curve T f (t), while

(4)

B / .P.JtDH

where: Ke - coefficient taking into account operational factors,

Co is the concentration of contaminants in the fuel having

density Рз, g | - fuel cleaning ratio by weight,

 - porosity of the curtain material, QT - filter operating time by volume of purified fuel. To prevent adhesion of the corrugations under the pressure of a contaminated filter curtain, they are equipped with comb drainage inserts.

Figure 1 presents a top view (in section) of the proposed filter, and figure 2 shows one of the comb drainage inserts used in the filter curtain.

In Fig.1 marked: filter curtain 1, the inner perforated outlet pipe 2, the outer perforated shell 3, the comb drainage insert 4. The outlet pipe 2 and

the shell 3 is closed by end caps not shown in FIG. 1. A filter curtain 1 with corrugations is provided; with them, a curvilinear bend in a plane perpendicular to the axis of the filter is placed between the casing 3 and the outlet pipe 2.

For a given value of H, which characterizes the ratio of the filter height H to its diameter D, the diameter D is selected in accordance with relation (1), the diameter d of the outlet pipe 2 is determined by expression (2), and the width of the corrugation h of the filter curtain 1 in the free state is expression (3).

The corrugation step t of the filter curtain 1 is selected according to the criterion of the maximum conditional resource T with the definition

the inflection points of the curve T f (t) Moreover, T corresponds to (4).

The device operates as follows.

The initial fuel is fed into the filter through the holes in the casing 3, i.e. from the periphery to the center, and is cleaned by a filter curtain 1. The filtrate enters the openings of the outlet pipe 2 and from it flows to the consumer. During the operation of the filter and the contamination of the curtain 1, the adhesion of its corrugations is prevented by geared drainage inserts 4.

Compared to traditional filters that use star-shaped filter curtains and filter diameters

corresponds to D (figure 1), in the proposed device, the filtration surface is doubled within the same filter volume. The increase in the filtration surface determines the increase in the resource of the filter curtain 1 and the filter as a whole.

According to the calculated and experimental data, the proposed design allows to increase the nominal throughput by 1.74 times in comparison with traditional filters and 2.1 times increase the filter curtain 1 life, expressed by the service life before its replacement. Compared with the known filters, in which the filtering curtain is made with corrugations that are helically oriented relative to the filter axis, the optimal choice of the parameters of the constituent elements in this case provides a significant increase in the filtration efficiency.

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Claims (3)

1. Filter for liquids and gases, containing an outer perforated shell and an inner perforated outlet pipe, closed by end caps, and also a filter curtain located between the shell and the outlet tube with corrugations having a curved bend in a plane perpendicular to the filter axis, characterized in that it for a given value of H, characterizing the ratio of the height of the filter H to its diameter D, the diameter D is selected in accordance with the ratio

where V _tn is the nominal flow rate of the filtered fuel (filter capacity); ν _t is the kinematic viscosity; ρ _t is the density; Δp _n - pressure drop (Δp _n = 10 kPa); d _0.95 - nominal filtration fineness, outlet pipe diameter d is defined as d = D / 2, and the width of the corrugation h _{with a} filter curtain in a free state corresponds to the expression

where k _h is the coefficient of increase in the width of the spiral corrugation with respect to the straight line. 2. The filter according to claim 1, characterized in that the corrugation step t of the filtering curtain is selected according to the criterion of maximum conditional resource

with determination of the inflection point of the curve

= f (t); moreover,

where: K _e - coefficient taking into account operational factors, With _{about the} concentration of contaminants in the fuel having a density p _s η is the fuel purification coefficient by weight, ψ _{about the} porosity of the curtain material, Q _t - filter operating time by volume of purified fuel. 3. The filter according to claim 1 or 2, characterized in that to prevent adhesion of the corrugations under the pressure of a contaminated filter curtain, they are equipped with comb drainage inserts.