Pumps – Motor driven – Electric or magnetic motor
Patent
1996-01-29
1998-05-12
Thorpe, Timothy
Pumps
Motor driven
Electric or magnetic motor
418 88, 403354, F04B 1700
Patent
active
057497168
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention pertains to an oil-sealed vacuum pump with a pump chamber, with a rotor rotatively mounted therein, with a bearing piece delimiting the pump chamber on the drive side and with a passage in the bearing piece which contains a coupling piece used to interlock the rotor with the shaft of a drive motor and a sealing ring to seal off the coupling piece from the passage in the end plate.
A vacuum pump of this kind is known from DE-A-23 54 039. In the case of this known pump, the inserted coupling piece has a pot-like shape. The shaft of the drive motor engages into the inside space of the coupling piece and is linked to it via radial cams by way of a positive fit. This solution necessitates that the coupling piece be manufactured with very close tolerances as well as precise central mounting of the drive shaft or the drive motor, so that the sealing effect and the service life of the shaft sealing rings running on the coupling piece is not impaired by a non-centric rotation of the coupling piece. Moreover, the known vacuum pump is not equipped with an oil pump. The effect of the oil flow from the oil sump to the locations which must be supplied with oil (pump chambers, bearing bore etc.) relies on the presence of a low pressure in the area of these locations during normal operation.
However, this suction effect is not present when the vacuum pump is operated at an intake pressure of about 1000 mbar (atmospheric pressure). This is the case, for example, when the chamber which is to be evacuated has developed a fault. If such faults are not determined immediately, there is the danger that substantial damage will occur in the vacuum pump owing to the lack of lubricant.
SUMMARY OF THE INVENTION
It is the task of the present invention to create an oil-sealed vacuum pump of the aforementioned kind, the coupling piece of which may be manufactured and mounted in an easier manner without impairing leaktightness within the end plate. Moreover, the pump shall be equipped with an oil pump, production of which is more cost-effective.
This task is solved by the characteristic features of the patent claims.
The coupling piece designed according to the present invention has besides the known functions (coupling, running surface for a shaft sealing ring), the additional function of being the carrier and drive for a rotor of an oil pump. The total number of parts which have to be manufactured is thus reduced. Moreover, the coupling piece itself can be manufactured in a simpler manner, since it no longer requires a central pocket hole. Precise central running of the coupling piece is hardly impaired any more owing to each of the positive fit connections on the face sides for the rotor or for the shaft of the drive motor.
BRIEF DESCRIPTION OF THE DRAWINGS
Further advantages and details of the present invention shall be explained by referring to drawing FIGS. 1 to 5.
Drawing FIG. 1 shows a longitudinal section through a design example for a rotary vane pump according to the present invention.
Drawing FIG. 2 shows a rotor according to the present invention.
Drawing FIG. 3 shows one face side of the rotor with projections.
Drawing FIG. 4 shows an oil pump where the rotor is part of the coupling piece.
Drawing FIG. 5 shows an oil pump with a rotor which is linked by way of a positive fit to the coupling piece.
Drawing FIG. 6 shows a left end view of the oil pump with a rotor illustrated in FIG. 5.
Drawing FIG. 7 shows a right end view of the oil pump with a rotor illustrated in FIG. 5.
DESCRIPTION OF THE INVENTION
The presented pump 1 comprises chiefly the subassemblies housing 2, rotor 3 and drive motor 4.
Housing 2 substantially has the shape of a pot with an outer wall 5, with the lid 6, with an inside section 7 containing pump chambers 8, 9 as well as bearing bore 11 with end piece 12 and bearing piece 13, which limit on their face sides the pump chambers 8, 9. The axis of the bearing bore 11 is designated as 14. Arranged eccentrically to this, are the axes 15 and 16 of the pump ch
REFERENCES:
patent: 4276005 (1981-06-01), Bassan
patent: 5236313 (1993-08-01), Kim
Abelen Thomas
Arndt Lutz
Muller Peter
Leybold Aktiengesellschaft
Thorpe Timothy
Tyler Cheryl J.
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