CN216767845U - Mechanical sealing device - Google Patents

Abstract

The utility model discloses a mechanical sealing device, which comprises a shaft sleeve connected with a pump shaft, a movable ring seat in transmission connection with the shaft sleeve, a movable ring which is arranged in the movable ring seat and rotates along with the movable ring, a static ring seat connected with a pump body, a static ring which is fixedly arranged in the static ring seat and a compensation mechanism, wherein the movable ring and the static ring form a sealing end surface; the compensation mechanism is arranged at the end part close to the medium side between the shaft sleeve and the movable ring seat and used for elastic compensation; the compensation mechanism comprises a first compensation part close to the medium side and a second compensation part arranged at intervals with the first compensation part, the first compensation part comprises a first disc spring and a first coating sleeve coating the first disc spring, and the second compensation part comprises a second disc spring. The mechanical sealing device provided by the utility model is provided with the compensation mechanism which comprises the first compensation part and the second compensation part which are arranged at intervals, so that the compensation range and the compensation pressure are enlarged, and the service life of the mechanical sealing device is effectively prolonged.

Description

Mechanical sealing device

Technical Field

The utility model relates to the technical field of mechanical sealing, in particular to a mechanical sealing device which is suitable for conveying particles with heavy density, high hardness, high concentration and corrosive media and has higher sealing requirements.

Background

In the equipment such as centrifugal pump, centrifuge, reaction kettle, compressor, etc., because the transmission shaft runs through the inside and outside of the equipment, there is a circumferential gap between the shaft and the equipment, the medium in the equipment leaks outwards through the gap, if the pressure in the equipment is lower than the atmospheric pressure, the air leaks into the equipment, therefore, a shaft sealing device for preventing the leakage is necessary. The shaft seals are of various types, and mechanical seals are widely applied due to the advantages of good sealing performance, long service life, low power loss, difficult abrasion of the surfaces of shafts or shaft sleeves and the like.

The mechanical seal is a shaft seal device which achieves leakage resistance by keeping the fit of a pair of integrated mechanical seals or a plurality of pairs of end faces which slide relatively and are vertical to a shaft under the action of fluid pressure and the elasticity (or magnetic force) of a compensation mechanism and matching with auxiliary seals, and the mechanical seal is usually provided with a spring, a sealing ring and other structures.

When a medium containing heavy-density, high-hardness particles and high-concentration particles is conveyed, impurity particles in the medium are easy to deposit on a spring, a sealing ring and the like, so that a mechanical seal compensation mechanism is jammed, mechanical seal leakage is caused, and mechanical seal failure is directly caused when the jam is serious. When corrosive media are transported, corrosion may also occur to the compensating mechanism of the mechanical seal, resulting in failure of the mechanical seal.

The problem that a compensation mechanism is prone to jamming is solved by arranging one coating disc spring in an existing mechanical sealing device, but in the working condition that pressure is high, only one coating disc spring is arranged, the compensation range is small, compensation pressure is small, the compensation mechanism is still prone to being damaged, and leakage is prone to occurring in use.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a mechanical sealing device to solve the problems that in the prior art, a coated disc spring is arranged on the mechanical sealing device, so that the compensation range is small, the compensation pressure is small, and the mechanical sealing device is easy to damage, so that the mechanical sealing fails.

In order to achieve the above purpose, the utility model provides the following technical scheme: a mechanical sealing device comprises a shaft sleeve connected with a pump shaft, a movable ring seat in transmission connection with the shaft sleeve, a movable ring which is arranged in the movable ring seat and rotates along with the movable ring, a static ring seat connected with a pump body, a static ring which is fixedly arranged in the static ring seat and a compensation mechanism, wherein the movable ring and the static ring form a sealing end face;

the movable ring seat is arranged at one end of the shaft sleeve close to the medium side, the static ring seat is arranged at one end of the shaft sleeve far away from the medium side, and the compensation mechanism is arranged at the end part close to the medium side between the shaft sleeve and the movable ring seat and used for elastic compensation;

the compensation mechanism comprises a first compensation part close to the medium side and a second compensation part arranged at intervals with the first compensation part, the first compensation part comprises a first disc spring and a first coating sleeve coating the first disc spring, and the second compensation part comprises a second disc spring;

the movable ring seat comprises a first disc spring seat used for installing the first compensation piece, a second disc spring seat used for installing the second compensation piece, and a fixing piece which fixes the first disc spring seat and the second disc spring seat into a whole.

Further, the second compensation part also comprises a second coating sleeve coating the second disc spring.

Further, the second disc spring seat is provided with a step, and the step is abutted to the second disc spring.

Further, the first coating sleeve and the second coating sleeve are one or a combination of more of an acid-resistant rubber sleeve, an alkali-resistant rubber sleeve, an oil-resistant rubber sleeve and a water-resistant rubber sleeve.

Furthermore, the number of the first compensation pieces is one or more, the first disc spring seats are arranged at intervals, and the first disc spring seats correspond to the first compensation pieces one by one.

Furthermore, the number of the second compensation parts is one or more, the second compensation parts are arranged at intervals, and the second disc spring seats correspond to the second compensation parts one to one.

Further, the fixing part comprises a fastening bolt for fixing the first disc spring seat and the second disc spring seat, a bolt sealing ring arranged between the fastening bolt and the first disc spring seat, and a fifth sealing ring arranged between the first disc spring seat and the second disc spring seat.

Furthermore, the shaft sleeve comprises a first shaft sleeve connected with the pump shaft and a second shaft sleeve connected with the pump shaft, and the second shaft sleeve is sleeved at one end of the first shaft sleeve.

Further, a third sealing ring is arranged between the second shaft sleeve and the movable ring.

Further, the third sealing ring is an O-shaped ring or a spring energy storage ring.

Compared with the prior art, the mechanical sealing device provided by the utility model has the following advantages:

the mechanical sealing device provided by the utility model is provided with the compensation mechanism for elastic compensation, the compensation mechanism comprises the first compensation part close to the medium side and the second compensation part arranged at intervals with the first compensation part, the elastic compensation force is improved, the compensation range and the compensation pressure are increased, the use requirement under the high-pressure working condition is met, and the service life of the mechanical sealing device can be effectively prolonged; even if one of the compensation parts is damaged or the main seal fails, the compensation capacity and the sealing performance of the whole compensation mechanism can not be lost.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. In the drawings:

fig. 1 is a schematic structural view of a mechanical seal device according to embodiment 1 of the present invention;

fig. 2 is an enlarged view of a portion a of the mechanical seal device shown in fig. 1.

Fig. 3 is a schematic structural view of a mechanical sealing device according to embodiment 2 of the present invention;

FIG. 4 is a schematic structural view of a mechanical seal device according to example 3 of the present invention;

fig. 5 is a schematic structural diagram of a mechanical sealing device according to embodiment 3 of the present invention.

Reference numerals:

the sealing device comprises a shaft sleeve 1, a first shaft sleeve 11, a second shaft sleeve 12, a first sealing ring 13, a movable ring seat 2, a first disc spring seat 21, a second disc spring seat 22, a step 221, a fixed part 23, a 231 fastening bolt, a 232 bolt sealing ring, a 233 fifth sealing ring, a second sealing ring 24, a movable ring 3, a third sealing ring 31, a stationary ring seat 4, a fourth sealing ring 41, a stationary ring 5, a compensating mechanism 6, a first compensating part 61, a first disc spring 611, a first wrapping sleeve 612, a second compensating part 62, a second disc spring 621, a second wrapping sleeve 622 and a transmission key 7.

Detailed Description

The present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific examples described in the following embodiments of the present invention are merely illustrative of specific embodiments of the present invention and do not limit the scope of the utility model.

The utility model is further described with reference to the following figures and detailed description of embodiments.

Example 1

As shown in fig. 1, fig. 1 is a schematic structural diagram of a mechanical sealing device according to embodiment 1 of the present invention.

The embodiment provides a mechanical sealing device, which is suitable for conveying equipment containing heavy-density particles, high-hardness particles, high-concentration particles, corrosive media and high sealing requirements (such as high-pressure working conditions), and is particularly suitable for conveying acid-base equipment containing impurities.

The mechanical sealing device comprises a shaft sleeve 1 connected with a pump shaft, a movable ring seat 2 in transmission connection with the shaft sleeve 1, a movable ring 3 which is arranged in the movable ring seat 2 and rotates along with the movable ring, a static ring seat 4 connected with a pump body, a static ring 5 fixedly arranged in the static ring seat 4 and a compensating mechanism 6, wherein the movable ring 3 and the static ring 5 form a sealing end face;

the movable ring seat 2 is arranged at one end of the shaft sleeve 1 close to the medium side, the static ring seat 4 is arranged at one end of the shaft sleeve 1 far away from the medium side, and the compensation mechanism 6 is arranged at the end part between the shaft sleeve 1 and the movable ring seat 2 close to the medium side and used for elastic compensation;

the compensation mechanism 6 comprises a first compensation member 61 close to the medium side and a second compensation member 62 arranged at a distance from the first compensation member 61, the first compensation member 61 comprises a first disc spring 611 and a coating sleeve 612 coating the first disc spring 611, and the second compensation member 62 comprises a second disc spring 621;

the moving ring seat 2 comprises a first disc spring seat 21 for mounting the first compensating piece 61, a second disc spring seat 22 for mounting the second compensating piece 62, and a fixing piece 23 for fixing the first disc spring seat 21 and the second disc spring seat 22 into a whole.

The mechanical sealing device is provided with the compensation mechanism for elastic compensation, the compensation mechanism comprises a first compensation piece close to the medium side and a second compensation piece arranged at intervals with the first compensation piece, elastic compensation force is improved through the plurality of compensation pieces, compensation range and compensation pressure are increased, the use requirement under a high-pressure working condition is met, and the service life of the mechanical sealing device can be effectively prolonged; even if one of the compensation parts is damaged or the main seal fails, the compensation capacity and the sealing performance of the whole compensation mechanism can not be lost.

As shown in fig. 1, the shaft sleeve 1 includes a first shaft sleeve 11 connected to the pump shaft and a second shaft sleeve 12 connected to the pump shaft, and the second shaft sleeve 12 is sleeved on one end of the first shaft sleeve 11. The first shaft sleeve 11 is arranged at one end of the pump shaft close to the medium side, and the second shaft sleeve 12 is arranged at one end of the pump shaft close to the atmosphere side, namely, the end far away from the medium side.

The shaft sleeve 1 is divided into two parts, and the second shaft sleeve 12 moves leftwards or rightwards according to actual conditions so as to provide different pressing amounts. Of course, in other embodiments, the number of the shaft sleeves 1 may also be 1, or more than 2.

Further, the shaft sleeve 1 further comprises a plurality of first sealing rings 13 arranged between the first shaft sleeve 11 and the second shaft sleeve 12. First sealing washer 13 is O type circle, U type circle or spring energy storage circle, in this embodiment, first sealing washer 13 is O type circle, and quantity is two, plays double sealing and supporting axle sleeve 1's effect, has strengthened the ability of resisting strong impact, has avoided causing sealed complete failure after the single sealing washer became invalid, improves sealed reliability. Of course, in other embodiments, there may be one first sealing ring 13, or 3 or more first sealing rings.

The movable ring seat 2 is used for installing the movable ring 3, and the shaft sleeve 1 is in transmission connection with the movable ring seat 2 through a transmission key 7. Specifically, the second shaft sleeve 12 is in transmission connection with the moving ring seat 2 through the transmission key 7, so that the moving ring seat 2 rotates with the pump shaft under the driving of the second shaft sleeve 12.

A second sealing ring 24 is arranged at a gap between the moving ring seat 2 and the moving ring 3 and used for assisting sealing, so that the medium is effectively prevented from leaking to the atmosphere side from the gap, and as static sealing, even if the medium contains high-concentration particle impurities, the sealing performance of the medium cannot be adversely affected. The second sealing ring 24 may be an O-ring structure, or other sealing types such as a sealing gasket, a spring energy storage ring, etc. may be selected.

Further, a third sealing ring 31 is arranged between the second shaft sleeve 12 and the movable ring 3. The third sealing ring 31 has the functions of supporting and aligning the movable ring 3 and assisting in sealing, so that external impurities are prevented from entering the compensating mechanism 6, and the medium in the equipment is prevented from leaking outwards after the compensating mechanism 6 fails in sealing.

Further, the third sealing ring 31 is an O-ring or a spring energy storage ring, so that the sealing performance is better, and even if the compensation mechanism 6 fails to seal, the third sealing ring 31 can still play a good sealing role.

The stationary ring seat 4 is used for installing the stationary ring 5, and a fourth sealing ring 41 is arranged at a gap between the stationary ring seat 4 and the stationary ring 5, so that auxiliary sealing is realized, the medium is effectively prevented from leaking to the atmosphere side from the gap, and the stationary sealing is realized, so that adverse effects on the sealing performance of the stationary sealing can be avoided even if the medium contains high-concentration particle impurities. The fourth sealing ring 41 may be an O-ring structure, or may select other sealing types such as a sealing gasket, a spring energy storage ring, and the like.

The compensation mechanism 6 is used for giving elastic compensation to the moving ring seat 2, so that the moving ring 3 is in close contact with the static ring 5, and sealing is completed in a matching way.

The first compensation part 61 is a coated disc spring, and has a sealing function and an elastic compensation function. Specifically, the first disc spring 611 and the first cover 612 covering the first disc spring 611 are included, and the first cover 612 prevents leakage between the first disc spring 611 and the rotating ring seat 2, that is, the first compensator 61 is firstly in contact with the medium.

The first disc spring 611 is a disc spring and is also called a Belleville spring washer, the first disc spring is conical disc-shaped, the load is large, the stroke is short, the required space is small, the combination and the use are convenient, the maintenance and the replacement are easy, the economic safety is high, the device is suitable for precise heavy machinery with small space and large load, and the optimal application range of the compression stroke of the device is 10% -75% of the maximum compression stroke of the device.

The first covering sleeve 612 is one or a combination of more of an acid-resistant rubber sleeve, an alkali-resistant rubber sleeve, an oil-resistant rubber sleeve and a water-resistant rubber sleeve, and plays a role in sealing after being compressed. According to the properties of the conveying medium, such as acidity and alkalinity, chemical properties and particle hardness in the medium, coating materials with different properties are selected, and premature aging and failure of the coating materials are avoided.

In this embodiment, the second compensation member 62 further includes a second cover 622 covering the second disc spring 621, that is, the second compensation member 62 also covers the disc spring, and has a sealing function and an elastic compensation function.

The second coating sleeve 622 is one or a combination of more of an acid-resistant rubber sleeve, an alkali-resistant rubber sleeve, an oil-resistant rubber sleeve and a water-resistant rubber sleeve, and plays a role in sealing after being compressed. According to the properties of the conveying medium, such as acidity and alkalinity, chemical properties and particle hardness in the medium, coating materials with different properties are selected, and premature aging and failure of the coating materials are avoided.

In this embodiment, there are one first compensating member 61 and one second compensating member 62, the first disc spring 611 is the same as the second disc spring 621, and the first sheath 612 is the same as the second sheath 622; of course, in other embodiments, the first disc spring 611 may be different from the second disc spring 621, or the first cover 612 may be different from the second cover 622, or the first disc spring 611 may be different from the second disc spring 621, and the first cover 612 may be different from the second cover 622; the first compensation part 61 can be a plurality of and arranged at intervals, and the second compensation part 62 can be a plurality of and arranged at intervals; when there are a plurality of first compensating members 61 and second compensating members 62, the first disc spring 611 may be partially identical to or partially different from the second disc spring 621, or the first cover 612 may be partially identical to or partially different from the second cover 622, or the first disc spring 611 may be partially identical to or partially different from the second disc spring 621, and the first cover 612 may be partially different from the second cover 622, and may be arranged according to the specific compensating pressure requirement, and the larger the number of the first compensating members 61 and the second compensating members 62, the larger the compensating range, and the larger the compensating pressure.

For installing the first compensating piece 61 and the second compensating piece 62, the movable ring base 2 is divided into the first disc spring base 21 and the second disc spring base 22.

The first disc spring seat 21 is used for mounting the first compensation part 61, and the two parts are in one-to-one correspondence. Specifically, the inner side of the first compensating part 61 abuts against the outer side of the second shaft sleeve 12, the outer side of the first compensating part 61 abuts against the inner side of the first disc spring seat 21, and when the first compensating part abuts against the inner side of the second shaft sleeve 12, the first disc spring seat 21 and the second shaft sleeve 12 are both provided with a groove which is used for accommodating the first compensating part 61.

The second disc spring seat 22 is used for mounting the second compensation parts 62, and the two parts are in one-to-one correspondence. Specifically, the inner side of the second compensating member 62 abuts against the outer side of the second shaft sleeve 12, the outer side of the second compensating member 62 abuts against the inner side of the second disc spring seat 22, and when the second shaft sleeve 12 and the second disc spring seat 22 abut against each other, a groove which just accommodates the second compensating member 62 is formed in each of the second shaft sleeve 12 and the second disc spring seat 22.

At the same time, the movable ring 3 is also mounted in the second disc spring seat 22.

As shown in fig. 2, fig. 2 is an enlarged view of a portion a of the mechanical seal device shown in fig. 1.

The fixing member 23 includes a fastening bolt 231 for fixing the first disc spring seat 21 and the second disc spring seat 22, a bolt sealing ring 232 disposed between the fastening bolt 231 and the first disc spring seat 21, and a fifth sealing ring 233 disposed between the first disc spring seat 21 and the second disc spring seat 22.

The fastening bolt 231 fixes the first disc spring seat 21 and the second disc spring seat 22 into a whole to form the movable ring seat 2, and the bolt sealing ring 232 and the fifth sealing ring 233 are used for enhancing the sealing performance of a gap and used as auxiliary sealing.

The fifth sealing ring 233 may be an O-ring structure, or may be selected from other sealing types such as a sealing gasket, a spring energy storage ring, and the like.

Example 2

As shown in fig. 3, fig. 3 is a schematic structural view of a mechanical sealing device of embodiment 2 provided by the present invention.

Compared with example 1, example 2 provides the mechanical sealing device with the following differences: the number of the second compensation members 62 is two, and the second compensation members are arranged at intervals and matched with the second compensation members, the number of the second disc spring seats 22 is also two, and the fifth sealing ring 233 is arranged between the two second disc spring seats 22 for auxiliary sealing.

Example 3

As shown in fig. 4, fig. 4 is a schematic structural diagram of a mechanical sealing device according to embodiment 3 of the present invention.

Example 3 provides the mechanical seal device that differs from example 1 only in that: the second compensating part 62 is one and only includes the second disc spring 621, that is, the second disc spring is an uncoated disc spring, the uncoated disc spring is thinner, the sealing performance is ensured, the elastic compensating force is improved, the space is saved, and the size of the whole mechanical sealing device is smaller.

The second disc spring seat 22 is provided with a step 221, the step 221 abuts against the second disc spring 621, and the inner side of the second disc spring 621 is arranged in the groove of the second sleeve 12 to avoid the position movement.

Example 4

As shown in fig. 5, fig. 5 is a schematic structural diagram of a mechanical sealing device according to embodiment 4 of the present invention.

Example 4 provides the mechanical seal device different from example 1 only in that: the number of the second compensation members 62 is two, and each of the second compensation members 62 includes only the second disc spring 621, i.e. the disc spring is not covered. Of course, in other embodiments, the second compensation element 62 may be a plurality of disc springs, both covered and uncovered, spaced apart.

And two second disc spring seats 22 are provided, the fifth sealing ring 233 is provided between the two second disc spring seats 22 for auxiliary sealing, and the last second disc spring seat 22 is provided with the moving ring 3.

Each second disc spring seat 22 is provided with a step 221, the step 221 abuts against the second disc spring 621, and the inner side of the second disc spring 621 is arranged in the groove of the second shaft sleeve 12.

In the above description of the present specification, the terms "fixed," "mounted," "connected," and the like are to be construed broadly unless otherwise explicitly specified or limited. For example, with the term "coupled", it can be fixed, removable, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship. Therefore, unless otherwise specifically defined in the present specification, the specific meanings of the above-mentioned terms in the present invention can be understood by those skilled in the art according to specific situations.

From the above description of the present specification, those skilled in the art will also understand the terms used below, terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "lateral", "clockwise" or "counterclockwise" are based on the orientation or positional relationship shown in the drawings of the present specification, it is for the purpose of facilitating the explanation of the utility model and simplifying the description, and it is not intended to state or imply that the devices or elements involved must be in the particular orientation described, constructed and operated, therefore, the above terms of orientation or positional relationship should not be construed or interpreted as limiting the present invention.

In addition, the terms "first" or "second", etc. used in this specification are used to refer to numbers or ordinal terms for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present specification, "a plurality" means at least two, for example, two, three or more, and the like, unless specifically defined otherwise.

It should be noted that the above-mentioned embodiments illustrate rather than limit the utility model, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim.

Claims (10)

1. A mechanical sealing device is characterized by comprising a shaft sleeve (1) connected with a pump shaft, a movable ring seat (2) in transmission connection with the shaft sleeve (1), a movable ring (3) installed in the movable ring seat (2) and rotating along with the movable ring, a fixed ring seat (4) connected with a pump body, a fixed ring (5) fixedly installed in the fixed ring seat (4), and a compensation mechanism (6), wherein the movable ring (3) and the fixed ring (5) form a sealing end face;

the movable ring seat (2) is arranged at one end, close to the medium side, of the shaft sleeve (1), the static ring seat (4) is arranged at one end, far away from the medium side, of the shaft sleeve (1), and the compensation mechanism (6) is arranged at the end, close to the medium side, between the shaft sleeve (1) and the movable ring seat (2) and used for elastic compensation;

the compensation mechanism (6) comprises a first compensation part (61) close to the medium side and a second compensation part (62) arranged at a distance from the first compensation part (61), the first compensation part (61) comprises a first disc spring (611) and a first coating sleeve (612) coating the first disc spring (611), and the second compensation part (62) comprises a second disc spring (621);

the movable ring seat (2) comprises a first disc spring seat (21) used for installing the first compensating piece (61), a second disc spring seat (22) used for installing the second compensating piece (62), and a fixing piece (23) which fixes the first disc spring seat (21) and the second disc spring seat (22) into a whole.

2. A mechanical sealing arrangement according to claim 1, wherein the second compensator (62) further comprises a second casing (622) surrounding the second disc spring (621).

3. A mechanical sealing arrangement according to claim 1, characterized in that the second disc spring seat (22) is provided with a step (221), the step (221) abutting the second disc spring (621).

4. A mechanical sealing arrangement according to claim 2, wherein the first (612) and second (622) sheaths are a combination of one or more of acid-resistant rubber sheath, alkali-resistant rubber sheath, oil-resistant rubber sheath, and water-resistant rubber sheath.

5. A mechanical sealing device according to claim 1, wherein the number of the first compensation members (61) is one or more, and the first disc spring seat (21) is in one-to-one correspondence with the first compensation members (61).

6. A mechanical seal according to claim 1, wherein the number of the second compensation members (62) is one or more and the second disc spring seat (22) is in one-to-one correspondence with the second compensation members (62).

7. A mechanical sealing arrangement according to claim 1, characterized in that the fixing element (23) comprises a fastening bolt (231) for fixing the first and second disc spring seats (21, 22), a bolt sealing ring (232) arranged between the fastening bolt (231) and the first disc spring seat (21), and a fifth sealing ring (233) arranged between the first and second disc spring seats (21, 22).

8. A mechanical sealing arrangement according to claim 1, characterized in that the shaft sleeve (1) comprises a first shaft sleeve (11) connected to the pump shaft and a second shaft sleeve (12) connected to the pump shaft, the second shaft sleeve (12) being fitted over one end of the first shaft sleeve (11).

9. A mechanical sealing arrangement according to claim 8, characterized in that a third sealing ring (31) is arranged between the second sleeve (12) and the rotating ring (3).

10. A mechanical sealing arrangement according to claim 9, characterized in that the third sealing ring (31) is an O-ring or a spring-loaded ring.

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