Turbine pump with a stator stage integrated with a spacer ring

Details Turbine pump with a stator stage integrated with a spacer ring Turbine pump with a stator stage integrated with a spacer ring

2002-05-31

2004-01-13

Verdier, Christopher (Department: 3745)

Rotary kinetic fluid motors or pumps

Smooth runner surface for working fluid frictional contact

C073S040700

Reexamination Certificate

active

06676368

ABSTRACT:

FIELD OF THE INVENTION
The present invention refers to high-vacuum pumps, and more particularly it concerns a turbine pump, in particular a turbomolecular pump, comprising a stator stage integrated with a spacer ring and located in correspondence of an intermediate inlet for a gas flowing in counter-current flow to the operating direction of the pump.
BACKGROUND OF THE INVENTION
Pumps with such an intermediate inlet are employed for example, in leak detectors. In leak detectors a test gas, usually helium, which enters a vessel to be tested or escapes therefrom because of leaks, is led to the intermediate inlet of the pump, then it flows in counter-current flow towards a gas detector, usually a mass spectrometer, connected to the low-pressure side of the pump.
Examples of such pumps are disclosed in U.S. Pat. No. 4,472,962 entitled “Low Pressure Leak-Detector” issued Sep. 25, 1984 and U.S. Pat. No. 5,585,548 entitled “Counterflow Leak-Detector Unit With A High-Vacuum Pump” issued Dec. 17, 1996.
The '962 patent discloses a pump in which the intermediate inlet opens into an annular channel, formed in the pump housing and surrounding the rotor of an intermediate pumping stage. That pump requires a relatively high vacuum in the area where the test gas enters, a vacuum of the order of 10
−5
mbar, (1 mPa).
The '548 patent discloses a pump in which the intermediate inlet opens into a transition chamber separating a group of low-pressure stages and a group of high-pressure stages. The chamber is limited upwards by a rotor impeller and downwards by a stator stage comprising a stationary disc, defining with the rotor shaft a constriction intended for providing a high detection sensitivity without any danger of the pressure in the test gas detector increasing to inadmissible levels. In an embodiment, the disc has a set of axially projecting strips. This pump does not require a relatively high vacuum in the inlet area of the test gas, where it tolerates pressures of the order of 0.1 mbar (10 Pa).
Therefore it is desirable to provide a pump with an intermediate inlet, exhibiting improved performance in terms of compression ratio and conductance of the test gas, such as helium, in order to increase the maximum pressure that can be tolerated at the intermediate port through which the test gas enters.
SUMMARY OF THE INVENTION
The present invention provides a pump where the transition chamber is limited by a stator stage integrated with a spacer ring and comprising a disc having a peripheral edge, integral with the disc and forming the spacer ring, and radial blades formed in a peripheral region of the disc and joined therewith at both a radially inner edge and a radially outer edge.


REFERENCES:
patent: 3748055 (1973-07-01), Becker et al.
patent: 4472962 (1984-09-01), Mennenga
patent: 4550593 (1985-11-01), Reich
patent: 5158426 (1992-10-01), Casaro et al.
patent: 5585548 (1996-12-01), Grosse Bley et al.
patent: 5733104 (1998-03-01), Conrad et al.
patent: 6030189 (2000-02-01), Bohm et al.
patent: 39 22 782 (1990-02-01), None
patent: 199 37 393 (2001-02-01), None
patent: 60-62692 (1985-04-01), None
patent: 222587 (1968-11-01), None

Affiliated with

Also associated with

Rating

Turbine pump with a stator stage integrated with a spacer ring does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Turbine pump with a stator stage integrated with a spacer ring, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Turbine pump with a stator stage integrated with a spacer ring will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3200580