Vapor lead-through system for a rotary evaporator, and a rotary evaporator

• US 6,709,025 B2
• Filed: 02/15/2001
• Issued: 03/23/2004
• Est. Priority Date: 02/17/2000
• Status: Expired due to Fees

• Current Assignee: BÜCHI Labortechnik AG
• Original Assignee: BÜCHI Labortechnik AG
• Inventors: Spring, Arthur
• Primary Examiner(s): Browne, Lynne H.
• Assistant Examiner(s): Hewitt, James M.
• Application Number:
  US09/783,127
• Publication Number:
  US 20010020368A1
• Time in Patent Office: 1,132 Days
• Field of Search: 285/223, 285/231, 285/234, 285/272, 285/278, 285/280, 285/281
• US Class Current: 285/272
• CPC Class Codes: B01D 3/085 using a rotary evaporator
• CPC Class Codes: B01L 3/565 Seals in general F16L
• CPC Class Codes: F16L 27/0828 having radial bearings connections of quick-acting couplings maintained by balls or rollers under radial pressure F16L37/22

Abstract

A vapour lead-through system for a rotary evaporator with a rotatable evaporator vessel (5) and a stationary cooler (7) consists of a vapour lead-through tube (6) and a connection piece (8). The vapour lead-through tube (6) is on the cooler-side mounted in a stationary seal (9). On the evaporator-side end the vapour lead-through tube (6) is connected to the connection piece (8) in a manner such that the axis (A) of the vapour lead-through tube (6) is movable with respect to the axis (A′) of the connection piece (8).

Claims

1. A vapor lead-through system for a rotary evaporator including a rotary evaporator vessel, a stationary cooler, a vapor lead-through connecting the evaporator vessel to the cooler, and a drive part for rotating the evaporator vessel, the vapor-lead through comprising

a connection piece drivable by the drive part, said connection piece having a longitudinal axis and being connected to the evaporator vessel,

a single vapor lead-through tube, said connection piece being drivable with the drive part and being connected or connectable to the evaporator vessel, said vapor lead-through tube being arranged within a seal at its cooler side end, said seal being stationary with respect to the cooler, and having a longitudinal axis, an evaporator end and a cooler end, and

a stationary seal surrounding said cooler end of said tube, said seal comprising a deformable lip, and further comprising

an annular gap between said yapor lead-through tube and said drive part adjacent the evaporator end of the tube, thus permitting the vapor lead-through tube to deviate radially with respect to the drive part to compensate for eccentric movement of the connection piece.

2. A vapor lead-through system according to claim 1, wherein said seal bears sealingly on the outer wall of the vapor lead-trough tube and is reversibly deformable under influence of heat.

3. A vapor lead-through system according to claim 1, wherein said seal consists of an inert, friction-modified plastic.

4. A vapor lead-through system according to claim 3, wherein said seal consists of PTFE.

5. A vapor lead-through system according to claim 1, wherein said seal is held in a base body of an inert plastic.

6. A vapor lead-through system according to claim 5, wherein said seal is held on a base body of PTFE.

7. A vapor lead-through system according to claim 5, wherein said base body bears sealingly on a connection piece of the cooler.

8. A vapor lead-through system according to claim 1, wherein said seal comprises an annular body.

9. A vapor lead-through system according to claim 1, further comprising a first ring on tie outer circumference of a base body, and a second ring within the seal.

10. A vapor lead-through system according to claim 9, wherein said first ring or said second ring is a steel ring.

11. A vapor lead-through system according to claim 1, wherein said vapor lead-through tube is mounted at the evaporator-side end by a seal in such a manner that the outer wall of the vapor lead-through tube sealingly bears on the inner side of the seal.

12. A vapor lead-through system according to claim 11, wherein said evaporator-side seal is V-shaped in cross section.

13. A vapor lead-through system according to claim 11, wherein said evaporator-side seal by way of axial forces is sealingly connected and in the circumferential direction movably connected to the connection piece.

14. A vapor lead-through system according to claim 11, wherein said evaporator-side seal on its outer side comprises a spherical surface and said connection piece comprises on its inner side a taper-ground joint, wherein the spherical surface of the seal while forming a ball joint sealing lies in the taper-ground joint of the connection piece.

15. A vapor lead-through system according to claim 11, wherein said seal on the evaporator-side end of the vapor lead-through tube is made of an inert plastic.

16. A vapor lead-through system according to claim 11, wherein said evaporator-side seal comprises an O-ring.

17. A vapor lead-through system according to claim 16, wherein said O-ring consists of rubber.

18. A vapor lead-through system according to claim 1, wherein said vapor lead-through tube at the evaporator side end comprises a flange for preventing displacement in the axial direction.

19. A vapor lead-through system according to claim 18, wherein said flange is latchable in a recess of the drive part.

20. A rotary evaporator including a rotatable evaporator vessel and a stationary cooler, a vapor lead-through assembly connecting the evaporator vessel to the cooler and a drive part for rotating the evaporator vessel, wherein

the vapor lead-through assembly comprises a connection piece and a single vapor lead-through tube having a longitudinal axis,

said connection piece has a longitudinal axis and is drivable with the drive part and is connected or connectable to the evaporator vessel,

said vapor lead-through tube is arranged within a seal at its cooler side end, said seal being stationary with respect to the cooler and comprising a deformable lip, and

an annular gap between said vapor lead-trough tube and said drive part adjacent the evaporator end of the tube, thus permitting the vapor lead-through tube to deviate radially with respect to the drive part, to compensate for eccentric movement of the connection piece.