Electrical screw spindle coolant pump

Abstract

An electrical screw spindle coolant pump is suitable for conveying a coolant circuit or other corrosive, liquid media. The electrical screw spindle coolant pump has a spindle housing with a spindle chamber and an axially adjacent motor housing. The motor housing has a motor chamber, in which a dry-running electric motor is arranged separated from the flow current. The motor housing has a thermal transition portion through which the flow current flows. The thermal transition portion is arranged between the motor chamber and a component boundary of the motor housing to the spindle housing.

1 . An electric screw coolant pump for delivering a coolant circulation comprising:
 a spindle housing having a spindle chamber in which at least two screw spindles are rotatably accommodated;   a pump inlet and a pump outlet for guiding a delivery flow through the spindle chamber;   a motor housing arranged axially adjacent to the spindle housing;   wherein   the motor housing includes a motor chamber in which a dry-running electric motor is arranged so the motor chamber is delimited with respect to the delivery flow; and   the motor housing comprises a heat transfer section, through which the delivery flow flows, arranged between the motor chamber and a component boundary between the motor housing and the spindle housing.   
     
     
         2 . The electric screw coolant pump according to  claim 1 , wherein
 the heat transfer section includes the pump outlet.   
     
     
         3 . The electric screw coolant pump according to  claim 1 , wherein
 the heat transfer section includes a delivery flow chamber that establishes a connection between a frontal delimitation of the motor chamber and the spindle chamber.   
     
     
         4 . The electric screw coolant pump according to  claim 1 , wherein
 the heat transfer section includes a bearing seat for a shaft bearing arranged between the electric motor and the screw spindles.   
     
     
         5 . The electric screw coolant pump according to  claim 1 , wherein
 an electronic system for the electric motor is arranged inside the motor chamber.   
     
     
         6 . The electric screw coolant pump according to  claim 1 , wherein
 a stator and/or an electronic system of the electric motor is in contact with a frontal delimitation of the motor chamber inside the motor housing.   
     
     
         7 . The electric screw coolant pump according to  claim 1 , wherein
 the heat transfer section is formed integrally with the motor housing.   
     
     
         8 . The electric screw coolant pump according to  claim 1 , wherein
 the spindle housing is formed as one piece.   
     
     
         9 . The electric screw coolant pump according to  claim 1 , wherein
 at the component boundary between the motor housing and the spindle housing, a flange joint is formed of a flange section of the motor housing and a flange section of the spindle housing.