DE7540607U - Mechanical seal for sealing a shaft - Google Patents

Description

The innovation relates to a mechanical seal for sealing a Shaft, with a stationary seated counter ring, a rotating, in its axial direction displaceable sliding ring and one to this coaxially arranged, the sliding ring in its axial direction resiliently biasing against the counter ring and the torque exerted on the sliding ring transmitting conical spring, the wide end of which is attached to the sliding ring and whose narrow end is axially supported, a frictional connection on the inner circumference forms as well as with the free end of the wire running out here in the main direction of rotation of the sliding ring.

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In known mechanical seals of this type, see the support the sliding surface pending frictional torque on the shaft transmitting cone spring with its narrow end on a shaft shoulder or the like axially. To transmit torque, the wire end bent radially outward at the wide end of the cone spring engages in a recess of the sliding ring and takes it with it, while at the narrow end of the conical spring its last narrowest turn is pressed against the smooth shaft surface by pulling it shut and creates a frictional connection. An advantage of this training is that on the shaft no disturbing and in the production expensive recesses or the like are required for the positive fastening of the conical spring.

Such well-known conical and internally tensioning springs are in their frictional engagement on the shaft depending on its direction of rotation. To have to therefore, depending on the direction of rotation, either left-hand or right-hand winding springs are used. These known mechanical seals can then fail when the shaft (and thus the sliding ring) moves against its main direction of rotation, for which the conical spring is designed, because it no longer closes with its narrow end, but on the contrary Opens. A torque transmission through this conical spring is then no longer guaranteed.

The task of the present innovation is to provide a mechanical seal of the The type mentioned at the beginning should be designed in such a way that it is also considered to be closed

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754G607 27.0177

Rotational surface formed shaft an at least conditional independence of the direction of rotation is achieved, as in particular during commissioning periods - if, for example, the motor is wrongly polarized is - the mechanical seal does not fail and, at the same time, axial assembly is made possible in tight installation spaces with little space requirement.

This object is achieved according to the invention by an open wire clamping ring with at least one resilient inner circumference Applicable frictional connection forming turn, whose in the Main direction of rotation of the sliding ring pointing wire end has a stop against which the free wire end of the cone spring to plant can be brought.

In contrast to known mechanical seals, the cone can spring thus also opposite to the main direction of rotation of the sliding ring, the frictional torque on the sliding surface is transferred to the shaft, in that the free wire end of this cone spring is supported against the stop on the wire end of the rotary clamping ring, which closes in this direction of rotation and in turn transmits the torque to the shaft.

In an advantageous development of this innovation, the wire clamping ring essentially the shape of a helical spring with approximately one and a half turns, the direction of which is opposite to that of the conical spring is and consists of the same spring wire as the cone spring.

7540807

Preferably, the stop of the wire clamping ring consists of an im essentially parallel to its axis, the conical spring facing bend of the pointing in the main direction of rotation of the slide ring Wire end of the wire clamping ring.

To skip the narrow conical spring end over the wire clamping ring to prevent, is preferably between the cone spring and the wire clamping ring, which are arranged one after the other in the axial direction are, an intermediate disk is arranged and the stop or the offset protrudes through a recess in the intermediate disk,

In the following, an embodiment of the innovation is explained with reference to the drawing, which shows a partial longitudinal section through the Mechanical seal shows.

The mechanical seal serves to seal the passage point a rotating shaft 1 opposite a seal housing 2. The shaft 1 has an annular groove 3 in which an internally tensioning spring washer 4 is provided. The shaft 1, the sealing housing 2, which in the ring groove 3 contained in the shaft and the internally tensioning spring ring 4 are known and do not form part of the innovation according to the invention Mechanical seal.

A wire clamping ring surrounding the shaft lies axially on the spring ring 4 5 at. This wire clamping ring 5 is used as a helical spring

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1 1/2 turns and is also frictionally on the circumference this wave. The free wire end 9 of the wire clamping ring 5 facing the active sealing elements is axially bent and protrudes through a recess 7 in an intermediate disk 6 which can be pushed onto the shaft 1.

This designed as a stop 8 wire end 9 of the wire clamping ring 5 serves as a stop for the free wire end 10 running out a conical spring 11. The conical spring 11 surrounds the shaft 1 and extends from its end 12, which is close to it, with increasing Radius up to a sliding ring carrier sleeve 19, which is provided with a bore 13 is provided, in which the radially outwardly bent end 14 of the cone spring 11 protrudes.

The one surrounding the shaft 1 with radial play, the mechanical seal facing wide end 14 of the cone spring 11 presses the sliding ring carrier sleeve 19 carrying the actual sliding ring 15 with the interposition a washer 16 and one of this support sleeve opposite the Shaft 1 sealing O-ring 17 against a counter ring 18.

The arrow R indicates the main direction of rotation of the rotating shaft 1 Sliding ring 15, the arrow L the brief reverse direction of rotation during commissioning periods.

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754069? 27.0177

Claims (5)

F / room 2 111 · Il I t ι til > t I October 19, 1976 Official File corpses! G 75 ho 607, ^ File; Sm 7889 protection claims, Mechanical seal for sealing a shaft, with a stationary Gelijgerten counter ring, a circumferential, sliding ring displaceable in its axial direction and a coaxially arranged to this, the The sliding ring resiliently biases against the counter ring in its axial direction and transmits the torque exerted on the sliding ring Conical spring, the wide end of which is attached to the sliding ring and the narrow end of which is axially supported, forms a frictional connection on the inner circumference and with the free end of the wire running out here in the main direction of rotation of the sliding ring has, gekennzei chnet by an open wire clamping ring (5) with at least one with their inner circumference forming a resiliently attachable frictional connection Winding whose wire end (9) pointing in the main direction of rotation (R) of the sliding ring (15, 19) has a stop (δ) against which the free wire end (1o) of the conical spring (11) can be brought to bear. 7540607 01/27/77 H! * MS !! * I III 2.) Mechanical seal according to claim 1, characterized in that the wire clamping ring (5) essentially the Has the shape of a helical spring with approximately one and a half turns, the winding direction of which is opposite to that of the conical spring (11) is. 3.) Mechanical seal according to claim 1 or 2, characterized gekennzei chnet that the wire clamping ring (5) consists of the same spring wire as the conical spring (11), 4.) Mechanical seal according to one of the preceding claims, characterized in that the stop (8) of the wire clamping ring (5) from a substantially parallel to its axis, the conical spring (11) facing bend of the in the Main direction of rotation of the slide ring (15, 19) facing wire end (9) the wire clamping ring (5) commits. 5.) Mechanical seal according to one of the preceding claims, characterized in that between the conical spring (11) and the wire clamping ring (5) in the axial direction are arranged one after the other, an intermediate washer (6) is arranged and that the stop (8) or the bend protrudes through a recess (7) in the intermediate disk (6). F / room 2 7140607