Pumps – One fluid pumped by contact or entrainment with another – Contact or entrainment within rotary impeller
Patent
1996-10-15
1998-04-07
Freay, Charles G.
Pumps
One fluid pumped by contact or entrainment with another
Contact or entrainment within rotary impeller
417 69, F04C 1900
Patent
active
057356742
DESCRIPTION:
BRIEF SUMMARY
In a liquid-ring gas pump, the liquid ring circulating in the working space with the impeller takes part in the compression of the gas enclosed in the impeller cells. During this process, the inner surface of the liquid ring is brought close to the discharge opening through which the gas passes out of the working space into the discharge space, and mixing of the gas and the liquid also takes place to a certain extent. It is therefore unavoidable that operating liquid will pass continuously from the working space into the discharge space and will thereby be lost from the liquid ring. This loss of operating liquid is compensated in part by supplying fresh liquid and otherwise by recirculating liquid from the discharge space into the working space as "recirculated liquid". To this end, adequately dimensioned passages are provided in that part of the casing which contains the discharge space. This part of the casing also forms the connections and for this reason is referred to below as the connection casing. Within a hub space provided for the purpose, this connection casing can also contain the mechanical seal, which must be lubricated and cooled during operation. In the prior art, this is achieved by passing the fresh liquid through the hub space or by diverting a part stream out of the liquid ring, passing it via the mechanical seal and returning it to the working space on the inlet side (DE-U-7017341).
The object on which the invention is based is to reduce the requirement for fresh liquid or simplify the routing of the liquid. It achieves this by virtue of the the fact that the recirculated liquid should be used to lubricate the mechanical seal and, to achieve this, the connection for the recirculation of the returned liquid is passed out of the discharge space into the working space via the hub space. In comparison with those known pumps in which the mechanical seal is lubricated by means of fresh liquid, this has the advantage that the part of the liquid situated in the discharge space which is used as a cooling flow reduces the requirement for fresh liquid and that the cooling of the seal is not dependent on the continuous supply of fresh liquid. This can therefore be reduced and does not need to be maintained continuously. Compared with the abovementioned known pump, in which the cooling is carried out by means of a stream diverted specially for this purpose from the liquid ring, this has the advantage of simplification.
In the case of another known pump (DE-A-1903887). the space containing the seal is connected to the working space by a passage through which liquid can both flow in and out, i.e. can be exchanged. Admittedly, the seal space is also connected to the working space via an impeller gap; however, since this gap is to be sealed off as far as possible, it is not sufficient for the return of the recirculating liquid.
It has been found that the fear that the unavoidable gas content of the recirculated liquid in the discharge space could interfere with cooling is unfounded if the recirculated livid is taken from the discharge space at a point at which the liquid is in a calmed state and the gas content has largely separated out. According to the invention, this can be guaranteed particularly if the discharge space is provided, for the removal of the recirculated liquid, with an extension which leads from the discharge space to that side of the pump which contains the inlet space. On the one hand, the very length of the liquid path created by the extension of the discharge space gives greater surety that the recirculated liquid will be calm and free from gas bubbles. On the other hand, taking the extension to that side of the pump which contains the inlet space involves a largely horizontal course of the extension which permits good separation of any gas which the liquid may still contain before it reaches the hole leading from the extension to the hub space. If the pump is set up with the shaft horizontal, the extension should, in other words, lead to the opposite side of the vertical diameter
REFERENCES:
patent: 1668532 (1928-05-01), Stewart
patent: 3209987 (1965-10-01), Jennings
patent: 3713749 (1973-01-01), Fitch
patent: 3884596 (1975-05-01), Hoffmeister
patent: 3894812 (1975-07-01), Huse
patent: 4498844 (1985-02-01), Bissell et al.
patent: 4755107 (1988-07-01), Trimborn
patent: 4817265 (1989-04-01), Trimborn
patent: 5489195 (1996-02-01), Domagalla et al.
Domagalla Klaus
Segebrecht Udo
Freay Charles G.
SIHI GmbH & Co KG
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