Muffler

Details Muffler Muffler

1993-04-26

1995-03-21

Dang, Khanh

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181230, 181243, 181265, 181267, 417312, F01N 708

Patent

active

053998170

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention relates to a muffler for the exhaust of a machine.
2. Background Information
Mufflers are generally disposed in the end region of exhaust gas conduits which discharge the gases leaving the exhaust of a machine (engine, pump or the like) into the open.
The following problem exists, for example, in connection with rotary vacuum pumps:
Rotary vacuum pumps include single shaft (sliding vane rotary pumps, rotary piston pumps, or the like) and dual shaft pumps (pumps equipped with pairs of rotors of the screw, Roots, or claw type, or the like) which additionally may be constructed to have one or several stages. In order to improve the suction capability of such pumps, it is possible to increase their number of revolutions. However, this also causes a considerable increase in noise development. In particular, dry running dual shaft vacuum pumps (suction chamber without oil) generate very high noise pressure levels in the region of their exhausts.
Vacuum pumps of the above-mentioned type are frequently employed in chemical or other processes (etching, vapor deposition processes, or the like). The gases sucked in by the vacuum pump in these cases are generally damaging to the environment. The exhaust of the vacuum pump is therefore connected to a permanently installed exhaust gas conduit which discharges the conveyed gases through gas washers or other cleaning systems into the open air. The gases extracted, in particular, from etching and vapor deposition processes are additionally often heavily laden with dust. Since in such processes it is customary to employ dry-running vacuum pumps, there exists the problem of dust deposits, particularly in the discharge region of the pump and in the connected exhaust gas conduits.


SUMMARY OF THE INVENTION

It is therefore the object of the present invention to configure a muffler in such a way that it can be accommodated in the vicinity of the machine whose noise emission is to be reduced, even if the exhaust gas conduits are permanently installed, and so that it can be easily exchanged without costly installation work at the exhaust gas conduits to make it possible to exchange it, for example, if there is a heavy dust load, without significant interruptions of the operation.
According to the invention this is accomplished in that the muffler is configured as a cartridge-type component. The cartridge configuration is known from oil filters. The cartridge housing has an essentially cylindrical configuration and has a closed end face. The intake and discharge openings are disposed in the second end face. Generally the oil entrance opening is in a central position and the oil discharge opening is other than central. The central oil entrance opening is formed by a threaded pipe socket. By means of this thread, the oil filter cartridge can be screwed to the assembly in which the oil to be filtered is disposed.
The configuration of the muffler as a cartridge-type component has the advantage that this component can be quickly exchanged without costly installation work at the exhaust gas conduits. Moreover, a compact structure results so that the muffler generally can still be accommodated within the outer machine housing.
Particularly advantageous is the use of the muffler according to the invention in the mentioned vacuum pumps which are employed in chemical or other processes (etching vapor deposition processes, or the like). The dust deposits accumulating in the discharge region of the pump can be removed without interruption of operations--for example by exchanging the muffler. There is the additional effect that the annoying dust preferably collects within the muffler according to the invention so that cleaning of the conduit guides disposed upstream and downstream of the muffler is substantially unnecessary.


BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages and details of the invention will now be described with reference to embodiments thereof that are illustrated in FIGS. 1 to 3, in which:
FIG. 1 is

REFERENCES:
patent: 806714 (1905-12-01), Porter
patent: 1598578 (1926-08-01), Maxim
patent: 3032139 (1962-05-01), Gildone
patent: 3612216 (1971-10-01), Rieder

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