DE8606515U1 - Mechanical seal - Google Patents

Description

Mechanical seal
Description:

The innovation concerns a mechanical seal which consists of a sliding ring and a support ring, whereby recesses are arranged in the area of the circumferential surface of the sliding ring assigned to the support ring, which engage in soft, radially directed retaining tabs of the support ring, as well as a spring element extending between the sliding ring and the support ring.

DE-OS 17 50 565 discloses a mechanical seal consisting of a sliding ring and a support ring. The support ring shown in Figure 5 has a cross-section that is approximately U-shaped, with the outer leg being designed as an adhesive part and the inner leg as a cone. An anti-twisting device is provided between the sliding ring and the support ring, which is formed from a wart-shaped elevation in the adhesive part that extends into the axial groove of the sliding ring. The axial locking is carried out by radially bending the end area of the support ring, so that the sliding ring and support ring form an installation unit.

The disadvantage is the complex production of the support ring, which is drawn from sheet metal and then undergoes a further operation to attach the anti-twisting or release lock.

The innovation is based on the task of

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Mechanical seal according to the generic term of the main claim to be structurally improved in such a way that a reduction in the number of individual parts enables a more cost-effective production as well as a quick and simple assembly of the individual parts to produce a compact installation unit.

This task is solved in accordance with the innovation in that the open ends of the recesses have constrictions and that the retaining tabs are elastically deformable. The sliding ring is preferably made of cast iron. The recesses intended to accommodate the retaining tabs with the constrictions proposed according to the invention at the open ends of the recesses can be cast on. Machining the surface of the sliding ring or the constrictions is not necessary. The retaining tabs arranged on the support ring made of sheet metal are punched out and can be elastically deformed by cuts in the circumferential direction. The elastic deformability allows assembly over the constrictions of the recesses. To achieve larger contact surfaces, the retaining tabs can be angled. A favorable deformation of the retaining tabs in this context produces in particular - a bend at an angle less than 90°.

The innovation is shown in the drawing and is described in more detail below:

Figure 1 Installation unit "sliding ring - support ring" Figure 2 Detail of the bottom view of the sliding ring with retaining tabs

Figure 3 Detail of the side view of the support ring Figure 3a Detail of the bottom view with angled retaining tabs.

Figure 1 shows a mechanical seal consisting of a support ring (1) and a sliding ring (2) with conical peripheral surfaces (3,3') which serve as rolling surfaces for an O-ring (4) arranged between the sliding ring and the support ring. The seal in the machine housing is provided by a further O-ring (5). The inclinations of the two cones (3,3 ^' ) are different. With increasing axial displacement of the sliding ring (2), the cross-sectional deformation and diameter change of the O-ring (4) increases. Since the aim is to keep the axial force of the seal as low as possible, transmission of the frictional moments through the O-ring (4) is at risk. For this reason, an anti-twisting device in the form of radial retaining tabs (6) is provided on the support ring (1), which engage in recesses (7) in the sliding ring (2).

Figure 2 reveals the improvement according to the innovation, the recesses (7) of the sliding ring (2) have defined cast-on constrictions (10) at their open ends. The retaining tabs (6) are tied into the recesses (7) via the constrictions (10). The elastic behavior required for this can be created, for example, by incisions (11) of the retaining tabs (6) in the circumferential direction (see Figure 3). To achieve a firmer axial locking, the retaining tab areas (6 ¹ ) can be axially bent, see also Figure 3a.

After assembly, the sliding ring (2) and support ring (1) form an installation unit. The retaining tabs (6 or 6') provide anti-twisting protection and axial locking. In a unit with, for example, four recesses (7) or retaining tabs (6), these can be of different widths to make assembly easier and to avoid incorrect assembly.

Claims (7)

Protection claims: 1. Mechanical seal, consisting of a sliding ring and a support ring, whereby in the area of the circumferential surface of the sliding ring assigned to the support ring, recesses are arranged, into which radially directed retaining tabs of the support ring engage, as well as a spring element extending between the sliding ring and the support ring, characterized in that the open ends of the recesses (7) have constrictions (10) and that the retaining tabs (6) are elastically deformable. 2. Mechanical seal according to claim 1, characterized in that the sliding ring (2) consists of cast iron. 3. Mechanical seal according to claims 1 to 2, characterized in that the constrictions (10) can be cast onto the open ends of the recesses (7). 4. Mechanical seal according to claims 1 to 3, characterized in that the protective ring (1) consists of sheet metal. 5. Mechanical seal according to claims 1 to 4, characterized in that the retaining tabs (6) of the support ring (1) have incisions (11) in the circumferential direction. 6. Mechanical seal according to claims 1 to 5, characterized in that the retaining tab areas (6*) of the tt 44 .· 44 '"· t * 4 444 · 4 4 4 44 4 » *** *** 4 4* 44 44 4 « Support ring (1) can be angled. 7. Mechanical seal according to claims 1 to 6, characterized in that the retaining tab regions (6 ¹ ) are preferably bent at an acute angle. t« M Il Il '··· . · . Ill I ·» III I lltl t # · 4 · · 1 III · * &bull; t t I &igr; I I · *