Turbo molecular pump for mass spectrometer
First Claim
1. A turbo molecular pump comprising a stationary frame structure and at least one rotor stage located at a low pressure input region, wherein the at least one rotor stage is substantially accommodated within or substantially resides inside the stationary frame structure, wherein the rotor in the at least one rotor stage rotates about an axis with respect to the stationary frame structure during operation and has an axially aligned central shaft receiving member from which a first rotor blade portion extends substantially radially outward and is connected to a second rotor blade portion which extends substantially paraxially to, and along the central shaft receiving member towards a high pressure output region, wherein, during operation, the first and second rotor blade portions deflect gaseous matter substantially paraxially and radially inwards, wherein the central shaft receiving member, the first rotor blade portion and the second rotor blade portion are designed and configured such that there is a substantially free path between the second rotor blade portion and the central shaft receiving member for gaseous matter deflected substantially radially inwards.
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Accused Products
Abstract
The invention relates to turbo molecular pumps enabling high pumping speed. The disclosure suggests using one or more cage-like rotor stages to optimize pumping speed on vacuum systems with low gas flows and low ultimate pressures. This allows for a smaller motor as well as smaller overall form factor and makes it well suited, in particular, for compact mass spectrometers and desk-top mass spectrometers.
20 Citations
22 Claims
- 1. A turbo molecular pump comprising a stationary frame structure and at least one rotor stage located at a low pressure input region, wherein the at least one rotor stage is substantially accommodated within or substantially resides inside the stationary frame structure, wherein the rotor in the at least one rotor stage rotates about an axis with respect to the stationary frame structure during operation and has an axially aligned central shaft receiving member from which a first rotor blade portion extends substantially radially outward and is connected to a second rotor blade portion which extends substantially paraxially to, and along the central shaft receiving member towards a high pressure output region, wherein, during operation, the first and second rotor blade portions deflect gaseous matter substantially paraxially and radially inwards, wherein the central shaft receiving member, the first rotor blade portion and the second rotor blade portion are designed and configured such that there is a substantially free path between the second rotor blade portion and the central shaft receiving member for gaseous matter deflected substantially radially inwards.
- 15. A turbo molecular pump comprising a stationary frame structure and at least one rotor stage located at a low pressure input region, wherein the rotor in the at least one rotor stage rotates about an axis with respect to the stationary frame structure during operation and has an axially aligned central shaft receiving member from which a first rotor blade portion extends substantially radially outward and is connected to a second rotor blade portion which extends substantially paraxially to, and along the central shaft receiving member towards a high pressure output region, wherein, during operation, the first and second rotor blade portions deflect gaseous matter substantially paraxially and radially inwards, further comprising a third rotor blade portion which extends substantially radially outward from the central shaft receiving member and connects to the second rotor blade portion at a position between the low pressure input region and high pressure output region axially offset from the first rotor blade portion, in order to enhance mechanical stability, wherein, during operation, the third rotor blade portion deflects gaseous matter substantially paraxially.
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19. A mass spectrometer, comprising:
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a recipient which has at least one compartment that, during operation, is to be maintained at a pressure substantially lower than ambient atmospheric pressure, and a turbo molecular pump comprising a stationary frame structure and at least one rotor stage located at a low pressure input region, wherein the at least one rotor stage is substantially accommodated within or substantially resides inside the stationary frame structure, wherein the rotor in the at least one rotor stage rotates about an axis with respect to the stationary frame structure during operation and has an axially aligned central shaft receiving member from which a first rotor blade portion extends substantially radially outward and is connected to a second rotor blade portion which extends substantially paraxially to, and along the central shaft receiving member towards a high pressure output region, wherein, during operation, the first and second rotor blade portions deflect gaseous matter substantially paraxially and radially inwards, wherein the central shaft receiving member, the first rotor blade portion and the second rotor blade portion are designed and configured such that there is a substantially free path between the second rotor blade portion and the central shaft receiving member for gaseous matter deflected substantially radially inwards, and wherein the turbo molecular pump is mounted at the at least one compartment such that the second rotor blade portion substantially protrudes into the at least one compartment. - View Dependent Claims (20, 21)
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22. A mass spectrometer, comprising:
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a recipient which has at least two adjacent compartments that, during operation, are to be maintained at pressures substantially lower than ambient atmospheric pressure, and a turbo molecular pump of multi-port configuration comprising a stationary frame structure and at least a first rotor stage located at a low pressure input region, wherein the at least one rotor stage is substantially accommodated within or substantially resides inside the stationary frame structure, wherein the rotor in the first rotor stage rotates about an axis with respect to the stationary frame structure during operation and has an axially aligned central shaft receiving member from which a first rotor blade portion extends substantially radially outward and is connected to a second rotor blade portion which extends substantially paraxially to, and along the central shaft receiving member towards a high pressure output region, wherein, during operation, the first and second rotor blade portions deflect gaseous matter substantially paraxially and radially inwards, wherein the central shaft receiving member, the first rotor blade portion and the second rotor blade portion are designed and configured such that there is a substantially free path between the second rotor blade portion and the central shaft receiving member for gaseous matter deflected substantially radially inwards, and comprising a second rotor stage at a position spaced apart from the low pressure input region, which second rotor stage is of similar configuration as the first rotor stage located at the low pressure input region, wherein the turbo molecular pump of multi-port configuration is mounted at the at least two adjacent compartments such that the second rotor blade portion substantially protrudes into a first one of the at least two adjacent compartments and the second rotor stage is fluidically connected to a second one of the at least two adjacent compartments.
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Specification