Mechanical face seal assembly, in particular for hot media, and pump assembly
The invention relates to a mechanical seal arrangement for sealing on a rotating component ( 21 ), comprising a slide ring seal ( 2 ) having a rotating slide ring ( 3 ) and a stationary slide ring ( 4 ), which define a sealing gap ( 5 ) between the sliding surfaces ( 3 a, 4 a ) thereof, a recirculation conveyor ( 7 ) arranged adjacent to the rotating slide ring ( 3 ) wherein the recirculation conveyor ( 7 ) comprises a recirculation line ( 19 ) in which a cooling device ( 20 ) for cooling the recirculated fluid is arranged, a recirculation rotor ( 8 ) and a hollow cylindrical housing ( 9 ), wherein the recirculation line ( 19 ) leads to a cavity ( 6 ) in the region of the sealing gap ( 5 ) of the sliding ring seal ( 2 ), wherein the hollow cylindrical housing ( 9 ) comprises an inner shell surface ( 11 ) and an outer shell surface ( 12 ) and wherein a conveyor channel ( 10 ) is provided on the outer shell surface ( 12 ), which conveyor channel ( 10 ) is formed along the outer shell surface ( 12 ) from a start portion ( 13 ) to an end portion ( 14 ) wherein the start portion ( 13 ) of the conveyor channel ( 10 ) is separated from the end portion ( 14 ) by a separating web ( 15 ), wherein a plurality of feed openings ( 16 ) are provided in the hollow cylindrical housing ( 9 ), which open from the inner shell surface ( 11 ) into the conveyor channel ( 10 ), and wherein a single outlet opening ( 17 ) is provided at the end portion ( 14 ). (FIG. 1 )
1. A mechanical seal arrangement for sealing on a rotating component, comprising:
a mechanical seal having a rotating slide ring and a stationary slide ring, which define a sealing gap between the sliding surfaces thereof
a recirculation conveyor arranged adjacent to the rotating slide ring,
wherein the recirculation conveyor includes a recirculation line in which a cooling device ( 20 ) for cooling the recirculated fluid is arranged, a recirculation rotor and a hollow cylindrical housing,
wherein the recirculation line leads to a cavity in the region of the sealing gap of the mechanical seal, wherein the hollow cylindrical housing includes an inner shell surface and an outer shell surface, and wherein a conveyor channel is provided on the outer shell surface, which conveyor channel is formed along the outer shell surface from a start portion to an end portion,
wherein the start portion of the conveyor channel is separated from the end portion by a separating web,
wherein a plurality of feed openings are provided in the hollow cylindrical housing, which open from the inner shell surface into the conveyor channel, and
wherein a single outlet opening is provided at the end portion.
2. The mechanical seal arrangement according to claim 1 , wherein the outlet opening is directed in an axial direction of the mechanical seal arrangement.
3. The mechanical seal arrangement according to claim 1 , wherein a width of the conveyor channel is widened from the start portion to the end portion.
4. The mechanical seal arrangement according to claim 3 , wherein the conveyor channel widens continuously or widens stepwise starting from the start portion to the end portion.
5. The mechanical seal arrangement according to claim 1 , wherein center axes of the feed openings are inclined towards radial lines at an angle α.
6. The mechanical seal arrangement according to claim 1 , wherein the recirculation rotor comprises a plurality of blades.
7. The mechanical seal arrangement according to claim 6 , wherein the number of blades is not an even multiple of the number of feed openings.
8. The mechanical seal arrangement according to claim 1 , wherein all centers of the feed openings are located in a first plane which is perpendicular to the axial direction.
9. The mechanical seal arrangement according to claim 1 , wherein the conveyor channel comprises a first wall located in a second plane which is perpendicular to the axial direction.
10. The mechanical seal arrangement according to claim 9 , wherein a start of outlet opening is located in a third plane which is perpendicular to the axial direction, and wherein a first distance between the second and third planes is at least twice as large as a second distance between the second and first planes.
11. A pump arrangement comprising a pump having a pump rotor and a mechanical seal arrangement according to claim 1 .
12. The pump arrangement according to claim 11 , wherein the mechanical seal arrangement is arranged radially inside a pump housing.