DE202009013496U1 - Mechanical seal arrangement with axially clamped sliding ring - Google Patents

Abstract

Gas mechanical seal assembly comprising
A rotating sliding ring (2) connected to a rotating component (6) and having a first sliding surface (2a),
A stationary sliding ring (3) connected to a fixed component (8) with a second sliding surface (3a),
A first shaft sleeve (5) having a sleeve flange (52) which is in contact with a rear side (2b) of the rotary rotary ring (2), and
- A shoulder (16) which is directed to a portion of the first sliding surface (2a) of the rotating sliding ring (2), wherein between the shoulder (16) and the rotating seal ring (2), a spring element (15) is arranged.

Description

The invention relates to a mechanical seal arrangement for gaseous media with an axially clamped sliding ring.

Mechanical seal assemblies for gaseous media are used in, for example, compressors. In operation, a sealing gap filled with gas is built up between a rotating and a stationary sliding ring in order to ensure contactless running of the mechanical seal. In this case, the rotating seal ring is held with an axial gap of about 0.05 mm to avoid tensioning of the rotating seal ring. Since a speed of the compressor is 20,000 rpm or higher, high-frequency axial vibrations occur during operation. However, this also means that the rotating sliding ring resonates and staggers within its axial play. As a result, undesirable signs of wear occur on the rotating seal ring, in particular on its back abutment surface. Also, wear of the rotating seal ring is reinforced on the sealing surface.

It is therefore an object of the present invention to provide a mechanical seal assembly for gaseous media, which prevents a simple and inexpensive construction even at very high speeds, a vibration of the rotating seal ring.

This object is achieved by a gas-mechanical seal assembly having the features of claim 1. The dependent claims show preferred developments of the invention.

The gas-mechanical seal assembly according to the invention with the features of claim 1 has the advantage that even at high speeds, the rotating seal ring does not vibrate or a tumbling motion is avoided. As a result, undesirable wear on the rotating seal ring can be avoided. This is inventively achieved in that the rotating seal ring is arranged between a first sleeve flange of a shaft sleeve and a shoulder and between the shoulder and the rotating seal ring, a spring element is arranged. The spring element exerts an axial spring force on the rotating slip ring, so that it is pressed against the sleeve flange of the shaft sleeve and rests in any operating position on the sleeve flange. The spring element acts on a portion of the sliding surface of the rotating sliding ring and presses it with its back surface to the sleeve flange. In this case, the mechanical seal assembly according to the invention can continue to be made very compact and especially small in the axial direction.

In order to enable a safe and uniform introduction of force in the axial direction of the rotating seal ring, the spring element is preferably arranged completely circumferentially.

More preferably, the spring element is arranged in a recess formed in the shoulder. As a result, a simple and secure installation can be made possible.

As spring element, an axial annular spring or a plate spring or an axially compressed O-ring with resilient properties is preferably provided.

In order to allow a quick and easy installation, the shoulder on which the spring element is arranged, formed in a second shaft sleeve.

For a particularly compact construction, the second shaft sleeve has an axially projecting region, on the front side of which a receiving space for an O-ring is defined. The O-ring serves to center between the first shaft sleeve and the rotating seal ring. More preferably, the axially projecting portion and the shoulder include an inner edge portion of the rotating seal ring. Further preferably, the second shaft sleeve further comprises an inwardly directed stepped portion having a stop surface for abutment with an end face of the first shaft sleeve. As a result, an error-free and easy mounting of the second shaft sleeve can be made possible.

Hereinafter, a preferred embodiment of the invention will be described in detail with reference to the accompanying drawings. In the drawing is:

1 a schematic sectional view of a gas-mechanical seal assembly according to an embodiment of the invention,

2 an enlarged partial representation of 1 , and

3 and 4 Representations of a spring element.

The following is with reference to the 1 to 4 a gas mechanical seal assembly 1 according to a preferred embodiment of the invention described in detail.

The mechanical seal assembly comprises a rotating seal ring 2 with a sealing surface 2a and a stationary slip ring 3 with a sealing surface 3a , Between the two sealing rings 2 . 3 is a sealing gap during operation 4 educated.

The rotating seal ring 2 is over a first shaft sleeve 5 with a wave 6 connected. The first shaft sleeve 5 is by means of several pins 7 rotatably with the shaft 6 connected. The shaft sleeve 5 has a cylindrical base area 51 with a front side 54 , a sleeve flange 52 and an axial extension 53 on. The axial extension 53 engages over the rotating seal ring 2 (please refer 1 ). Furthermore, there is a back 2 B of the rotating sliding ring 2 completely on the sleeve flange 52 at. In the sleeve flange 52 is also a recess for an O-ring 55 educated.

How farther 1 it can be seen, is the stationary seal ring 3 with a stationary housing 8th connected. The stationary seal ring 3 is arranged movable in the axial direction XX and is by means of an axial biasing device 9 towards the rotating seal ring 2 biased. Furthermore, the gas-mechanical seal assembly comprises 1 a second shaft sleeve 10 with a base area 11 , an inward stage 12 , an axially projecting area 13 , one shoulder 16 and an annular recess 14 , The recess 14 is in the shoulder 16 educated. In the recess 14 is a completely circumferential spring element 15 arranged in detail in the 3 and 4 is shown. The spring element 15 is in this embodiment, a welded, axial annular spring, which is made of a wire. The spring element 15 is in the recess 14 arranged and is located with a portion of the sliding surface 2a of the rotating sliding ring 2 in contact. This exercises the spring element 15 a spring force in the axial direction on the rotating seal ring 2 out, leaving the rotating slip ring 2 with his backside 2a completely on the sleeve flange 52 the first shaft sleeve 5 is applied. This ensures that even at high speeds, the rotating seal 2 always on the shaft sleeve 5 rests and does not perform even axial oscillatory movements or a wobbling motion. As a result, wear of the rotating sliding ring can be avoided, so that the mechanical seal arrangement according to the invention has a significantly improved service life.

The second shaft sleeve 10 is with the axially projecting area 13 and the shoulder 16 formed such that an inner, peripheral edge region 2c of the rotating slip ring is included. Thus, the rotating seal ring is as shown 1 can be seen on two outer surfaces completely and on two outer surfaces partially in contact with other components and can thus be kept very safe.

The second shaft sleeve 10 is also located above the step 12 with the front side 54 the first shaft sleeve 5 in contact. Further defines an end face 17 of the axially projecting portion 13 the second shaft sleeve 10 a receiving space for an O-ring 20 which has a centering between the rotating seal ring 2 and the first shaft sleeve 5 provides.

Thus, a compact mechanical seal assembly for gaseous media can be provided according to the invention, which also at high speeds, for. B. when used in compressors, no wobbling movement and performs no axial vibrations. It should be noted that as a spring element 15 also in the recess 14 axially compressed O-ring or a plate spring o. Ä. Can be used.

LIST OF REFERENCE NUMBERS

1

Gas face seal assembly

2, 3

Glide

2a

first sliding surface / first sealing surface

2 B

Rear side of the rotating sliding ring

2c

inner mounting area

3a

second sliding surface / sealing surface

4

sealing gap

5

shaft sleeve

6

wave

7

pencils

8th

casing

9

axial pretensioner

10

second shaft sleeve

11

base region

12

inward step

13

axially projecting area

14

recess

15

spring element

16

shoulder

17

front

20

O-ring

51

cylindrical base area

52

sleeve flange

53

axial extension

54

Front side of the first shaft sleeve

55

Recess for O-ring

Claims (9)

Gas mechanical seal assembly comprising - one with a rotating component ( 6 ) associated rotary sliding ring ( 2 ) with a first sliding surface ( 2a ), - one with a fixed component ( 8th ) associated stationary slip ring ( 3 ) with a second sliding surface ( 3a ), - a first shaft sleeve ( 5 ) with a sleeve flange ( 52 ), which with a back ( 2 B ) of the rotating sliding ring ( 2 ) is in contact, and - one shoulder ( 16 ), which to a portion of the first sliding surface ( 2a ) of the rotating sliding ring ( 2 ), between the shoulder ( 16 ) and the rotating seal ring ( 2 ) a spring element ( 15 ) is arranged. Gas-mechanical seal arrangement according to claim 1, characterized in that the spring element ( 15 ) is provided completely circumferential. Gas-mechanical seal arrangement according to one of the preceding claims, characterized in that the spring element ( 15 ) in one in the shoulder ( 16 ) formed recess ( 14 ) is arranged. Gas-mechanical seal arrangement according to one of the preceding claims, characterized in that the spring element ( 15 ) is an axial ring spring or a plate spring or an axially compressed O-ring. Gas-mechanical seal arrangement according to one of the preceding claims, characterized by a second shaft sleeve ( 10 ), on which the shoulder ( 16 ) is trained. Gas-mechanical seal arrangement according to one of the preceding claims, characterized by an O-ring ( 20 ), for centering between the first shaft sleeve ( 5 ) and the rotating seal ring ( 2 ) is arranged. Gas-mechanical seal assembly according to claim 5 or 6, characterized in that the second shaft sleeve ( 10 ) an axially projecting area ( 13 ), which together with the shoulder ( 16 ) an inner edge region ( 2c ) of the rotating slip ring. Gas-mechanical seal assembly according to claim 7, characterized in that the axially projecting area ( 13 ) of the second shaft sleeve an end face ( 17 ), which has a receiving space for the O-ring ( 20 ) limited. Gas-mechanical seal assembly according to one of claims 5 to 8, characterized in that the second shaft sleeve ( 10 ) an inward step ( 12 ) with an axial stop surface for a stop with an end face ( 54 ) of the first shaft sleeve ( 5 ) having.

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