SU1364808A1 - Piston seal - Google Patents

Abstract

The invention relates to sealing technology, in particular to devices for sealing rod or pistons of single-acting cylinders, for example, with spring return. The purpose of the invention is to simplify the construction. The L-shaped cuffs rest on a spacer elastic ring. A part of the side surface of the piston groove on the side opposite to the pressure supply is toroidal with a recess along the radius with a transition to the end edge. The radius of the recess 8 corresponds to half the height of the groove 7. The end edge 9 is equal in size to the thickness of the sealing tab 5 L-shaped cuff 3. The shape of the side surface of the groove 7 with the recess 8 contributes to the least deformation of the spacer elastic ring 6 when pressure is applied. When a certain pressure value is reached, the spacer ring 6 is deformed, which causes an increase in radial forces on the sealing tab 5 of the cuff 3 along the contact plane, as well as an increase in the force on the sealing lip 10 from the impact of the wedge 12. 2 Il. (/)

Description

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The invention relates to the field of engineering, in particular to sealing technology, in particular, to devices for sealing rods or pistons of single-acting cylinders, for example, with spring return.

The purpose of the invention is to simplify the design due to ease of manufacture.

Figure 1 shows a seal without affecting the pressure differential of the working medium; a section; Figure 2 is the same, under the influence of the pressure drop of the working medium;

The seal consists of a piston 1, cylinder liner 2, sealing elastic cuff 3 L-shaped se1

placed in an annular flow-through constricting spacer ring 6 in an axle 4 on the piston, supported by the sealing direction. Upon reaching a definite distance

6 round sich.

With an elastic flap, an elastic ring installed in the piston groove 7 with a preliminary compression of the cross section in the radial direction, which is ensured by exceeding the cross section diameter of the spacer 6 in the free state above the cavity height formed by the groove 7 and the sealing tab 5 of the cuff 3. The part of the side surface of the groove 7 is opposite the pressure supply is made toroidal with a recess 8 along the radius corresponding to half the height of the groove 7 with a transition to the end edge 9 equal in thickness to the thickness of the seal cuff 3. The front edge .9 of the groove 7 and the sealing edge 10 of the petal 5 of the cuff 3 form an axial gap 11 between them, which is filled with a wedge I2 of the ring 6. The recess 8 serves to fix the spacer ring 6 in a position where The most compressed section of the ring 6 would be permanently in the zone of the axial gap 11.

Seal works as follows.

Before supplying the pressure of the working medium (Fig. 1) due to the preliminary compression of the cross section of the spacer ring 6 in the radial direction, the latter is deformed, taking the shape of a section that is close to elliptical, while

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divided by the pressure of the working medium, the spacer ring 6, which is in close contact with the recess 8 of the groove 7, is deformed, which causes an increase in radial forces on the sealing lip 5 of the cuff 3 along the contact LINGEREX, as well as an increase in force on the sealing edge 10 from the impact of the wedge 12. The shape of the lateral surface of the groove 7, made with a recess 8 along the radius, contributes to the least deformation of the spacer elastic ring when pressure is applied, which increases its service life and increases the reliability of compaction.

Claims (1)

Invention Formula 40 A piston seal that includes an L-shaped cuff mounted in a bore on the piston, which is supported by a sealing lip on a expandable elastic round ring, is placed in an annular groove on the piston, which is one of the sides to simplify the design on the side of the groove, on the side opposite to the pressure supply, is toroidal with a transition to an end edge equal in size to the thickness of the L-shaped sealing lobe eg cuffs. - is 3648082 a part of the space of the spacer ring 6 tends to penetrate and fill the annular gap 11 between the edge 10 of the sealing tab 5 of the cuff 3 and the end edge 9 of the groove 7. As a result, a wedge appears, the force from which acts on the edge 10 of the sealing tab 5 of the cuff 3 in place the least stiffness, thereby creating a specific pressure sufficient to seal the joint at zero and low pressures. When the pressure P is applied (Fig. 2), in addition to the preliminary compression of the spacer 6, due to the geometrical dimensions of the sealing elements, a force appears. ten The pressure value of the working medium, the spacer ring 6, which is in close contact with the recess 8 of the groove 7, is deformed, which causes an increase in radial forces on the sealing lip 5 of the cuff 3 along the contact strip L as well as an increase in the force on the sealing edge 10 from the impact of the wedge 12. The shape of the lateral surface of the groove 7, made with a recess 8 along the radius, contributes to the least deformation of the spacer elastic ring when pressure is applied, which increases its service life and increases the reliability of compaction. Invention Formula A piston seal that includes an L-shaped cuff mounted in a bore on the piston, which is supported by a sealing lip on a spacer elastic o-ring placed in an annular groove on the piston, is different because, in order to simplify the design, one of the side surfaces the grooves on the side opposite to the pressure supply are toroidal with a transition to an end edge equal in size to the thickness of the L-shaped sealing lobe cuffs.  L