Pumps – One fluid pumped by contact or entrainment with another – Contact or entrainment within rotary impeller
Patent
1995-08-15
1996-12-31
Freay, Charles G.
Pumps
One fluid pumped by contact or entrainment with another
Contact or entrainment within rotary impeller
417 54, F04B 4712
Patent
active
055888062
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for operating a liquid ring machine, as well as to a liquid ring machine for implementing the method.
In the case of a liquid ring machine disclosed by German Patent C 961 653, the working chamber is subdivided by a wall part that axially subdivides the impeller and by an intermediate wall of the housing shell arranged in the same plane with this wall part into two partial working chambers of the same size. During operation, a liquid ring forms in each partial working chamber.
Separate suction and discharge connections are assigned to each partial working chamber. In addition, the partial working chambers are interconnected in the lower region by openings, making it possible for both partial working chambers to be drained simultaneously through a shared outlet. A pump of this type is able to deliver two distinct gases having different pressures at the same time.
The CH-A 285 570 discloses a two-stage liquid ring pump, whose first stage is designed for a larger output volume than its second downstream stage. Such pumps generally experience difficulties when they have to work at a low vacuum.
In this case, the output volume of the first stage is substantially greater than that of the second stage. The second stage is not able to process the volume required by the first stage. As a result, blocking occurs, which reduces pump efficiency and can also cause damage to the pump. This working point has to be run through at every start-up operation of the pump. For this reason, it is provided in the case of this known pump for the second stage (high pressure stage) to be made inactive by removing operating liquid for so long until the ratio of the intake volume to the final volume corresponds to the ratio of the output volume of the first stage to that of the second stage. So much operating liquid is removed from the second stage, that its delivery is interrupted. Thus, the liquid ring, which requires a corresponding amount of energy for its actuation, still remains in the second liquid stage.
This invention is directed to a method of adapting a liquid ring machine to various types of loading and to provide a liquid ring machine for implementing this method.
SUMMARY OF THE INVENTION
The present invention solves this problem by a method for operating a liquid ring machine, whose apex lies in the geodetic upper area of the working chamber and whose working chamber is divided up into at least two partial working chambers, in the case of which method, at least one partial working chamber of the liquid ring machine is separated from the supply of operating liquid and is drained of the operating liquid at least to the point where the part of the impeller rotating in this partial working chamber does not come into contact with the operating liquid. This partial working chamber is also blocked on the suction and/or discharge side. The position of the apex in the geodetic upper area of the working chamber is guaranteed in that the eccentricity of the impeller is selected so as to provide adequate clearance between the unattached blade ends of the impeller and the inner housing wall of the working chamber in the geodetic lower area of the working chamber in which any existing sump liquid can collect without coming into contact with the unattached blade ends of the impeller.
By this means, a complete partial switching-off of the liquid ring machine. As a result, an adaptation of the suction capacity of the liquid ring machine to the required operating conditions is achieved that is simple and effective. This ability to adapt to the actual operating conditions is particularly advantageous, because the actual operating conditions cannot be precisely ascertained in advance in an installation of this type. In this respect, it is possible for an oversized liquid ring machine to be installed. Operational costs can then be considerably reduced by partially shutting down such a liquid ring machine. Previously, such an adjustment had only been possible in an operation us
REFERENCES:
patent: 2230405 (1941-02-01), Jennings
patent: 3154240 (1964-10-01), Jennings
patent: 3846046 (1974-11-01), Roe et al.
patent: 4323334 (1982-04-01), Haavik
patent: 5366348 (1994-11-01), Skelton
Mugele Kurt-Willy
Trimborn Peter
Freay Charles G.
Siemens Aktiengesellschaft
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