Rotary expansible chamber devices – Methods
Reexamination Certificate
1998-11-09
2001-08-28
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Methods
C418S083000, C418S085000, C418S094000, C418S102000, C418S206300
Reexamination Certificate
active
06280164
ABSTRACT:
BACKGROUND OF THE SUMMARY
This application claims the priority of European application No. 97 119 483.2, filed Nov. 7, 1997, the disclosure of which is expressly incorporated by reference herein.
The present invention relates to a method and apparatus for stabilizing the temperature in a gear pump lubricated with material to be delivered.
When gear pumps equipped with slide bearings and lubricated by the material to be delivered are used to deliver polymers, the temperature of the material being delivered is of great significance because if, the temperature is too low, the viscosity is too high, and decomposition phenomena can occur at temperatures that are too high. Therefore, an attempt is made to keep the temperature of the medium being delivered within a certain range. This makes it possible significantly to increase the size of the operating window of the gear pump.
Hence, known heat exchangers are provided in the housing of the gear pump and in the shaft for temperature stabilization. The heat exchanger in the housing is connected to a heating assembly by a first system of lines and the heat exchanger in the shaft is connected to a cooling device by a second system of lines. The housing that gives off heat to the environment during operation is kept at a preset temperature by the heating assembly. The cooling assembly compensates for the heat which is generated and released by friction between the shaft and the bearing, thereby avoiding local overheating of the material being delivered.
The known method for temperature adjustment is, however, cumbersome and associated with correspondingly high costs.
SUMMARY OF THE INVENTION
Hence, an object of the present invention is to provide a method that does not suffer from the above disadvantages.
This object has been achieved by providing that a medium is adjusted in a temperature stabilizer to a predetermined temperature; medium firstly flows through the (at least one) housing part and secondly through the shafts and/or slide bearings to stabilize the temperature.
Because the temperature stabilizer used for stabilizing the temperature in gear pumps is connected to both the heat exchanger in the shaft and/or in the slide bearing as well as to the heat exchanger in the housing, utilizing the invention the system is advantageously considerably simplified, as reflected particularly in lower costs.
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Heinen Michael
Kalt Stefan
Crowell & Moring LLP
Denion Thomas
Maag Pump Systems Textron AG
Trieu Theresa
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