SU877192A2 - Inflatable collar-type shaft seal - Google Patents

Description

(54) INFLATABLE CAMSHAFT SEAL OF SHAFT

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The invention relates to a sealing technique and can be used in shaft seal assemblies with significant angular misalignments and high media temperatures.

According to the main author. St. No. 365506 a sealing device is known, made in the form of an inflatable lip seal with an elastic sealing element protected by floating rings. Floating rings to compensate for the relative misalignment of the shaft are installed in the grooves formed by the end surfaces of the housing and the stop rings that compress the elastic element I}.

When the seal is working under conditions of high media temperatures, the material of the elastic sealing element burns, the seal is disrupted.

The purpose of the invention is to ensure the efficiency of compaction under the conditions of the temperature of the working medium up to 3000 ° C.

This goal is achieved by the fact that the elastic element is installed with respect to the sealing surface with a gap that forms a cavity with the floating rings, which is filled with a pseudo-liquid substance, such as powdered graphite.

 In order to ensure uniform pressure of the pseudo-liquid substance and eliminate local contact of the elastic element with the sealing surface, the elastic element is made with variable stiffness, decreasing from the center to the edges, which ensures the seal to work under conditions of high temperatures, since it eliminates the direct contact of the elastic element with an adjustable surface and its burning.

The drawing shows the seal, a general view.

The seal assembly consists of an annular cuff I, made of an elastic material and having a variable stiffness, large in the center and decreasing towards the edges. The cuff is put on a metal ring 2 having a cavity 3, a channel 4, a cavity 5, which in combination with the channel 6 form a cuff delivery system

1. The cuff 1 is supported on both sides by retaining rings 7, which, together with the housing 8 and the flange 9, form grooves 10 in which the floating rings I move,

having a narrow contact surface 12. The cuff I is installed with respect to the compacted edeme TJ-J with a gap that forms with the floating rings P the cavity I, filled with liquid solids 15, for example, a powdered graph.

The device works as follows.

The working medium supplied under pressure through the channel 6 into the cavity 3, through the cuff I, presses the pseudo-liquid substance 15 to the sealing element 13, creating a seal on its surface.

The floating ring II, due to the narrow contact surface 12. does not prevent the mixing of the sealing element 13 at a permissible angle and allows for minimum clearance in connection with it, therefore, rapid extrusion of matter into these gaps is impossible.

As a result, the absence of direct contact of the cuff with the sealing element increases the temperature range at which the seal can work, which

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allows the use of the proposed device at the temperature of the working medium up to 3000 ° C.

Claims (2)

1. Inflatable lip seal shaft by ed. St. No. 365506, characterized in that, in order to ensure the performance of the seal under conditions of high temperatures, the elastic element is made with variable stiffness, decreasing from center to edges, and is installed relative to the sealing surface with a gap forming a cavity with floating rings, filled with pseudo-liquid substance. 2. The compaction according to claim 1, characterized by the tcm, that the pseudo-liquid substance is powdered graphite. Information sources. taken into account during the examination 1. USSR Copyright Certificate No. 365506, cl. F 16 J 15/46. 1967.  7 YU // : xS: Yu