Pumps – One fluid pumped by contact or entrainment with another – Contact or entrainment within rotary impeller
Patent
1997-06-17
1998-09-01
Freay, Charles G.
Pumps
One fluid pumped by contact or entrainment with another
Contact or entrainment within rotary impeller
417312, 181229, F04C 1900
Patent
active
058001468
DESCRIPTION:
BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS
This is the national stage of International Application No. PCT/EP95/05093 filed Dec. 22, 1995.
During the operation of liquid-ring gas pumps, severe noise arises due to the fact that the vanes of the impeller periodically brush past the opening through which the liquid/gas mixture being pumped crosses from the working space in which the impeller revolves into the discharge space. This noise can be troublesome especially when the discharge stub connected to the top of the discharge space is connected to the atmosphere. Various means have therefore been proposed (DE-C 2036295, EP-A 367845) which ensure that the sound waves within the discharge space do not pass to the discharge stub unhindered. These means include, for example, silencing elements which, in the form of tubes, extend the discharge stub downwards into the discharge space (DE-C 2036295, FIGS. 14 and 18; EP Patent No. 644332, FIG. III). However, such means have the disadvantage that they represent an obstacle not only to the sound waves but also to flow and therefore give rise to losses in efficiency. In pumps the use of which does not require special silencing measures, there is therefore a reluctance to use them. However, it is expensive to provide special series of pumps for those applications in which silencing is required.
According to the invention, this disadvantage is avoided by means of the features stated herein. According to these, the tubular silencing element is provided in such a way as to be removable, making it possible to decide case by case whether it is used or not.
According to a special feature of the invention, it can be inserted into the assembled pump from outside through the discharge stub, allowing standard pumps to be retrofitted with the silencing element without this having to be taken into account during the assembly or storage of these pumps.
The silencing element is preferably a tube which is guided in the discharge stub, and a special device can expediently be provided in the discharge stub to hold the silencing element. According to a special feature of the invention, this is an elastic sealing ring which can be inserted into a circumferential groove in the discharge stub and the frictional force of which holds the tube inserted into the discharge stub as a silencing element. A shoulder or the like can be provided on this tube and, in cooperation with the holding means or sealing ring, prevents the tube from descending further than intended into the discharge space. According to another feature of the invention, a supporting stop is provided in the discharge space, and the bottom end of the tube inserted as a silencing element is supported on this.
The invention is explained in greater detail below with reference to the drawing, which illustrates an advantageous exemplary embodiment. In the drawing:
FIG. 1 shows a cross-section along the line II--II in FIG. 2 and
FIG. 2 shows a longitudinal section along the line I--I in FIG. 1.
FIG. 2 shows the working space 1 of the pump, in which the impeller 2 revolves and which is separated from the discharge space 4 by the control plate 3. The control plate 3 contains one or more discharge openings 5, through which the compressed medium crosses from the working space 1 into the discharge space 4 together with some of the operating liquid. Adjoining the discharge space 4 towards the top is the discharge stub 6, through which the gas and the excess operating liquid is discharged. In the example illustrated, the discharge stub is arranged vertically. This is advantageous but not absolutely essential.
As described thus far, the pump is known and is used for the usual application, in which special silencing means in the discharge space are not required.
According to the invention, the discharge stub 6 can have inserted into it a tubular silencing element 7, the diameter of which is slightly less than that of the discharge stub. If it is desired that its inside diameter should correspond approximately to the nominal diameter of the connec
REFERENCES:
patent: 4779703 (1988-10-01), Takigucji et al.
patent: 4929157 (1990-05-01), Steele et al.
patent: 5133647 (1992-07-01), Herron et al.
Junemann Alfons
Struck Gunther
Freay Charles G.
SIHI GmbH & Co. KG
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