SU1432381A1 - Apparatus for testing filter elements for strength - Google Patents

Abstract

The invention relates to a testing technique and can be used in tests for the strength of filtering elements (PE). The purpose of the invention is to increase the reliability in testing corrugated PE. In the cylindrical cavity of the housing 1 there is a closed annular elastic sheath 2. Elastic inserts 3 are installed between the corrugations of the effective partition 10. The sheath 2 is made with right angles 6 and has roundings and smooth thickenings of the wall in these corners. To compensate for the reduced axial force versus actual operating conditions from the pressure on the adhesive joint 9, the radial force from the pressure in the zone 8 is reduced by gradually increasing the thickness of the elastic shell S 2 in the corners 6, which approximates the corresponding axial and radial strength from pressure to real. 1 hp f-ly, 3il. (L

Description

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The invention relates to a test technique and can be used when testing the strength of filter elements.

The purpose of the invention is to increase the reliability when testing corrugated filter elements by ensuring uniform pressure distribution over their surface.

1) Fig. 1 shows a device for testing the strength of the filter elements, a section; figure 2 - section aa in figure 1; FIG. 3 is a diagram of the distribution of forces acting on the filter element under actual operating conditions.

A device for testing filtering elements comprises a housing 1 in whose cylindrical cavity a closed annular elastic sheath is placed 2. A source of excess pressure (not shown) is connected to the cavity of sheath 2. The transmitting element is made in the form of N elastic inserts 3 by the number of corrugations of the filtering element 4, and the inserts 3, parallel to each other and the axes, are in contact with the shell 2 with their direct generators and are placed evenly around the circumference. Each insert 3 is made in the form of a closed shell, the cavity 5 of which is filled with a medium under excess pressure. The shell 2 is made with straight angles 6 in axial section on the inner side and has rounding and smooth thickening of the wall in these corners.

The filter element 4 under test is a perforated tube 7, at the ends of which there are caps 8, which are attached to POM01CHI

adhesive bonding 9 is fixed by filtering, and partition 10.

The device operates as follows.

Between the corrugations of the filter septum 10, elastic inserts 3 are placed on the outside and the filter element 4 is placed into the cavity of the housing 1 with an elastic annular sheath 2. The cavity of the sheath 2 is filled with medium from an overpressure source. When expanding, the sheath 2 puts pressure on the inserts 3 and the LOOPS of the filter septum 10. The weakest point of the filter element 4 under test is adhesive bonding 9, which under actual operating conditions is amplified by the pressing forces R and PJ (Fig. 3). In a variety of conditions

R, R, R d.

The pressure P creates a radial force, which tends to press the filter septum 10 against the central perforated tube 7 and deform it. The resulting bending of the partition 10 in the direction of the tube 7 creates the greatest tear-off force of the partition 10 from the outer edge of the covers 8. In turn, the axial pressure P on the adhesive joint 9 prevents this.

In the device, the annular elastic shell 2 creates only a radial load on the partition 10, the axial pressure on the adhesive joint 9 is much less real and is transmitted only through the expansion of the elastic inserts 3.

To compensate for the reduced force from the axial pressure P on the adhesive joint 9, the radial force from the pressure P in the area of the caps 8 is reduced by gradually increasing the thickness of the elastic sheath 2 in the corners 6.

A smooth increase in the thickness of the shell 2 in the corners 6 approximates the ratio-. force from pressures P and P to the real, which increases the reliability of the tests.

When a pressure is created, exceeding the permissible value, the filtering unit Yu is destroyed, which is recorded by recording equipment.

Claims (1)

1. A device for compressing strength of filter elements, comprising a housing with a cylindrical cavity, a closed annular elastic sheath, concentrically placed in the body cavity and in contact with its inner walls with its outer surface and ends, an overpressure source connected to the sheath cavity, and transmissions for contacting its generators with the inner surface of the casing, characterized in that, in order to increase the reliability of testing the corrugated filter elements, the shell is made with right angles in the axial section and on the inside has a round laziness and FIG. 2