Pumps – One fluid pumped by contact or entrainment with another – Contact or entrainment within rotary impeller
Patent
1995-07-21
1997-02-25
Thorpe, Timothy
Pumps
One fluid pumped by contact or entrainment with another
Contact or entrainment within rotary impeller
F04C 1900
Patent
active
056054459
DESCRIPTION:
BRIEF SUMMARY
This is a 371 of international application PCT/DE94/00021, filed Jan. 11, 1994, now international publication WO 94/17309.
BACKGROUND OF THE INVENTION
The present invention relates to a liquid ring machine for selectively conveying several liquids. A machine housing eccentrically surrounds a rotor, which is closed off by means of lateral shields for the rotor shaft on end faces. The liquid ring machine includes a pressure slot assigned to the rotor and at least one control body provided with a suction slot. The at least one control body has at least one relief passage located in the pressure region of the liquid ring machine.
A typical liquid ring machine is disclosed in German Patent Document No. DE-C-31 24 867. This type of machine transmits energy to the medium to be conveyed, by the rotor, via a liquid ring formed from working liquid. Since the working liquid is directly in contact with the medium to be conveyed, as an energy carrier and as a sealing element, vapors are condensed, liquid and dirt particles are also conveyed, hot gases are cooled and compression heat is absorbed by the working liquid. If liquids are conveyed together in the liquid ring, an increased power requirement and a deterioration of the running properties of the rotor result, which can lead to accelerated wear of the rotor bearing.
Such a typical liquid ring machine achieves a reduction in power consumption, along with simultaneously improved running properties when liquids are conveyed together. This is achieved by providing a relief passage separate from the pressure slot of the control disk in the control body formed as a flat control disk. This relief passage is covered by the rotating liquid ring when liquids are conveyed together. The liquid ring machine disclosed in the German Patent Document does not provide any further explanation about the function of the relief passage.
SUMMARY OF THE INVENTION
The present invention relates to a liquid ring machine in which the total amount of liquid resulting from the usual working liquid and from the additional liquid occurring as a result of the process in question can be kept as constant as possible, so that an approximately uniform liquid ring thickness can be achieved.
According to an embodiment of the present invention, the relief passage is directly connected with the working liquid feed line of the liquid ring machine. Excess liquid exits through the relief passage and is directly fed to the working liquid. In the case where several liquids are conveyed together, the liquid ring thickness increases and thereby the amount of liquid exiting through the relief passage also increases. This liquid is conveyed directly to the working liquid.
This results in a reduction of the need for working liquid. Accordingly, since liquids are conveyed together automatically, an increase in the liquid ring thickness results in a throttling of the working liquid feed.
According to a further embodiment of the present invention, the relief passage is connected with a closed feed channel which opens outside the machine housing. In this embodiment, the increased amount of liquid which results when the liquid ring thickness increases is still conveyed away outside of the machine. An increased conveyance of several liquids results in increased pressure conditions in the pressure region, so that an increased exit of liquid through the relief passage of the liquid ring machine is effected. The pressure conditions which result therefore automatically regulate the liquid ring thickness.
A connection between the relief passage and the working liquid feed line, which runs outside of the housing, offers advantages with regard to accessibility and the cooling effect which can be achieved, while a connection located within the housing results in compact construction. In accordance with a further embodiment of the present invention, the connection can be provided either in the housing or outside of the housing. The connection can therefore be adapted to the operation and installation conditions in each ins
REFERENCES:
patent: 1904321 (1933-04-01), Nash
patent: 3289918 (1966-12-01), Adams
patent: 4545730 (1985-10-01), Lubke
McAndrews, Jr. Roland G.
Siemens Aktiengesellschaft
Thorpe Timothy
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