Slip ring sealing arrangement and slip ring sealing kit

Abstract

The invention relates to a mechanical seal assembly, comprising: a mechanical seal (10) including a rotating mechanical sliding ring (2) and a stationary mechanical sliding ring (3), defining a sealing gap (4) between them, a sliding ring carrier (5) arranged at the rotating mechanical sliding ring (2), at least one driver element (6) arranged between the rotating mechanical sliding ring (2) and the sliding ring carrier (5) and provided for transmitting a torque from the sliding ring carrier (5) to the rotating sliding ring (2), wherein the rotating sliding ring (2) is clearance-fitted into the sliding ring carrier (5), wherein the rotating sliding ring (2) comprises a first recess (20), wherein the sliding ring carrier (5) comprises a second recess (50), and wherein the driver element (6) is clearance-fitted into the first recess (20) and is clearance-fitted into the second recess (50).

Claims

1. A mechanical seal arrangement comprising: a mechanical seal including a rotating sliding ring and a stationary sliding ring defining a sealing gap therebetween, a sliding ring carrier, which is arranged on the rotating sliding ring, at least one driver element, which is arranged between the rotating sliding ring and the sliding ring carrier and is adapted to transmit a torque from the sliding ring carrier to the rotating sliding ring, wherein the rotating sliding ring is clearance-fitted into the sliding ring carrier, wherein the rotating sliding ring comprises a first recess, wherein the sliding ring carrier comprises a second recess, and wherein the driver element is clearance-fitted into the first recess and clearance-fitted into the second recess.

2. The mechanical seal arrangement according to claim 1, wherein the driver element comprises a cylindrical base body and a square contact region.

3. The mechanical seal arrangement according to claim 1, wherein the sliding ring carrier comprises a first annular groove and a second annular groove, wherein a first secondary seal is arranged in the first annular groove and a second secondary seal is arranged in the second annular groove, wherein each of said first and second secondary seal is an O-ring having circular or elliptical cross-section, or wherein each of said first and second secondary seal is an elastic shaped ring having a cross-section corresponding to a cross-section of said first and second annular groove.

4. The mechanical seal arrangement according to claim 1, further comprising a sleeve, the sliding ring carrier being arranged on the sleeve, wherein the sleeve comprises a groove and is connected to the sliding ring carrier by means of a torque transmitting portion, wherein the torque transmission region is integrally formed with the sliding ring carrier and projects into the groove of the sleeve to enable torque transmission from the sleeve to the sliding ring carrier.

5. The mechanical seal arrangement according to claim 1, wherein the first recess in the rotating mechanical seal is a first radial slot, which is continuous in the radial direction with respect to the axial direction (X-X).

6. The mechanical seal arrangement according to claim 1, wherein the groove in the sleeve is a second radial slot, which is continuous in the radial direction with respect to the axial direction (X-X).

7. The mechanical seal arrangement according to claim 1, wherein the second recess of the sliding ring carrier is a cylindrical bore having a diameter such that the cylindrical base body of the driver element is clearance-fitted into the cylindrical bore.

8. The mechanical seal arrangement according to claim 1, further comprising a spring element arranged between the sliding ring carrier and the rotating mechanical seal.

9. The mechanical seal arrangement according to claim 1, wherein said rotating sliding ring having has a diamond-coated sliding surface.

10. A mechanical seal kit comprising a mechanical seal arrangement according to claim 1, wherein the rotating sliding ring is selected from the group comprising a carbon ring or a ceramic ring or a sliding ring having a diamond-coated sliding surface and/or wherein the first and/or second secondary seal for sealing against the sliding ring carrier is selected from the group comprising O-rings having circular or elliptical cross-sections or elastic form rings having a cross-section corresponding to the cross-section of the first and second annular groove in the sliding ring carrier.

Description

(1) In the following, preferred example embodiments of the invention will be described in detail, while reference will be made to the accompanying drawing, wherein:

(2) FIG. 1 is a schematic sectional view of a mechanical seal arrangement according to a first embodiment of the invention,

(3) FIG. 2 is a schematic, enlarged sectional view of a driver element of FIG. 1,

(4) FIG. 3 is a perspective view of the driver element of FIG. 2,

(5) FIG. 4 is a perspective cut-out view of a sliding ring carrier of FIG. 1, and

(6) FIG. 5 is a schematic sectional view of a mechanical seal arrangement according to a second embodiment of the invention.

(7) In the following, a mechanical seal arrangement 1 according to a first preferred example embodiment of the invention will be described in detail below, while making reference to FIGS. 1 through 4.

(8) As can be seen from FIG. 1, the mechanical seal assembly 1 comprises a mechanical seal 10 having a rotating mechanical sliding ring 2 and a stationary mechanical sliding ring 3. The rotating mechanical sliding ring 2 and the stationary mechanical sliding ring 3 define a sealing gap 4 between them.

(9) The rotating mechanical sliding ring 2 comprises a first recess 20, which is formed as a radially continuous slot in this embodiment. The first recess 20 extends in a radial direction perpendicular to an axial direction X-X of the mechanical seal arrangement at a rear side of the rotating sliding ring, which rear side is opposite to the sliding surface of the rotating sliding ring 2, directed towards the stationary sliding ring 3.

(10) The mechanical seal arrangement 1 furthermore comprises a sliding ring carrier 5, which is made of a metallic material. The sliding ring carrier 5 is also shown in detail in FIG. 4. The sliding ring carrier 5 comprises a first annular groove 51 and a second annular groove 52. Furthermore, the sliding ring carrier 5 comprises a second recess 50. In this embodiment, the second recess 50 is a bore.

(11) Furthermore, a driver element 6 is provided, which is shown in detail in FIGS. 2 and 3. The driver element 6 comprises a cylindrical base body 60 and a square contact region 61. At the free end of the cylindrical base body 60, a chamfer 62 is provided. In the assembled state, the cylindrical base body 60 is positioned in the second recess 50 of the sliding ring carrier 5 and the square contact region 61 is in the first recess 20 in the rotating sliding ring 2. The driver element 6 has clearance in all directions, i.e. axially, radially and circumferentially, in both the first recess 20 and the second recess 50. A torque can be transmitted from the sliding ring carrier 5 to the rotating sliding ring 2 via the driver element 6.

(12) As further shown in FIG. 1, the first annular groove 51 in the sliding ring carrier 5 is provided radially outside the rotating sliding ring 2 directly above the rotating sliding ring 2. In the first annular groove 51, a first secondary seal is arranged, which is a first O-ring 11 in this example embodiment.

(13) Furthermore, the mechanical seal assembly 1 comprises a spring element 8, which is arranged between a sleeve 7 and the sliding ring carrier 5. The sleeve 7 is firmly connected to a rotating component, in this example embodiment a shaft 100. The spring element 8 biases the rotating sliding ring 2 in the axial X-X direction by means of the sliding ring carrier 5 to the stationary sliding ring 3.

(14) In addition, a torque transmission region 53, which projects into a groove 70 in the sleeve 7, is integrally provided at the sliding ring carrier 5, as shown in FIG. 1. The groove 70 is provided at a free end of the sleeve 7, which free end facing towards the rotating sliding ring 2, and is continuously formed in the radial direction. The sleeve 7 is firmly fixed to the shaft 100, for example by a clamping connection or by a setscrew 101, as shown in FIG. 1.

(15) A second secondary seal in the form of a second O-ring 12 is arranged in the second annular groove 52 of the sliding ring carrier 50, sealing the sliding ring carrier 5 against the sleeve 7.

(16) The stationary mechanical sliding ring 3 is arranged on a housing 30 and is sealed by a third O-ring 15.

(17) Furthermore, the mechanical seal assembly 1 comprises a fourth O-ring 16 at the sliding ring carrier 5, which seals against the shaft 100, and a fifth O-ring 17, which is arranged at the sleeve 7 and also seals against the shaft 100.

(18) The mechanical seal arrangement 1 seals a product side 18 against an atmosphere side 19. In this example embodiment, the mechanical seal arrangement 1 is located at a shaft 100, which drives a pump. Herein, no sterile application is provided, as regions are provided in the first annular groove 51 and the second annular groove 52 which are not filled with the first O-ring or the second O-ring 12,

(19) As the first O-ring 11 is arranged radially above the rotating sliding ring 2, the rotating sliding ring 2, which is clearance-fitted into the sliding ring carrier 5, will be fixed slightly. As the driver element 6 also has a clearance both in relation to the cylindrical base body 60 and the square contact region 61, no stresses are transferred to the rotating sliding ring 2 due to shrinkage or press fits between the driver element and the rotating sliding ring 2. As a result, the rotating mechanical seal 2 may easily be replaced or the mechanical seal assembly may be adapted to the rotating mechanical seal 2 without great cost by simply replacing the rotating mechanical seal 2 comprising different materials. Furthermore, the first O-ring 11 and the second O-ring 12 may also be easily replaced by sterile, elastic form seals. This provides for a mechanical seal modular kit system in which the secondary seals at the sliding ring carrier and the rotating mechanical seal 2 may easily be replaced depending on the application, as they are only inserted in the sliding ring carrier 5.

(20) FIG. 5 shows a mechanical seal arrangement according to a second embodiment of the invention. In the second example embodiment, in contrast to the first example embodiment, the first and second secondary sealing elements at the sealing ring carrier 5 are not configured as O-rings, but as a first elastic form ring 13 and a second elastic form ring 14. The elastic form ring 13 is arranged in the first annular groove 51 in the sealing ring carrier and the second elastic form ring 14 is arranged in the second annular groove 52 in the sealing ring carrier. By using the elastic form rings, all cross-sectional regions of the first and second annular grooves 51, 52 can be filled with an elastic material of the form rings. A third elastic form ring 25 is also arranged at the stationary sealing ring 3. The sleeve 7 is arranged at a shaft shoulder and can be clamped in place or fixed with an additional ring 102 and a squeezed O-ring 103. This qualifies the mechanical seal arrangement 1 of the second embodiment to be suitable for sterile applications, for example in the pharmaceutical industry or in the food industry.

(21) Thus, according to the invention, a cost-effective mechanical seal kit system may be provided, which has a common sliding ring carrier 5, a common sleeve 7, a common spring element 8 and a common driver element 9. As the driver element 6 and the rotating mechanical seal 2 are solely inserted into the sealing ring carrier 5, a particularly simple and cost-effective assembly may be provided without the risk of damaging the rotating sliding ring when being assembled, as possible, for example, when using a state-of-the-art thermal shrinking process for fixing the rotating sealing ring.

LIST OF REFERENCE NUMBERS

(22) 1 Mechanical seal arrangement

(23) 2 Rotating sealing ring

(24) 3 Stationary sealing ring

(25) 4 Sealing gap

(26) 5 Sliding ring carrier

(27) 6 Driver element

(28) 7 Sleeve

(29) 8 Spring element

(30) 10 Mechanical seal

(31) 11 First O-ring

(32) 12 Second O-ring

(33) 13 First elastic form ring

(34) 14 Second elastic form ring

(35) 15 Third O-ring

(36) 16 Fourth O-ring

(37) 17 Fifth O-ring

(38) 18 Product side

(39) 19 Atmosphere side

(40) 20 First recess in the rotating seal ring

(41) 25 Third elastic form ring

(42) 30 Housing

(43) 50 Second recess in the sealing ring carrier

(44) 51 First annular groove

(45) 52 Second annular groove

(46) 53 Torque transmission region

(47) 60 Cylindrical body

(48) 61 Square contact region

(49) 62 Chamfer

(50) 70 Groove

(51) 100 Shaft

(52) 101 Setscrew

(53) 102 Additional ring

(54) 103 Squeezed O-ring

(55) X-X Axial direction