Electric pump

Abstract

An electric pump may comprise a motor, an impeller driven by the motor, and a casing comprising a pump chamber that accommodates the impeller. The motor and the pump chamber may be disposed along a rotational axis of the impeller. The casing may comprise an intake port extending in a direction parallel to the rotational axis of the impeller and a discharge port extending in a direction perpendicular to the rotational axis of the impeller. The motor may have an oblong cross section that is perpendicular to the rotational axis of the impeller.

1 . An electric pump comprising:
 a motor;   an impeller driven by the motor; and   a casing comprising a pump chamber that accommodates the impeller,   wherein   the motor and the pump chamber are disposed along a rotational axis of the impeller,   the casing comprises an intake port extending in a direction parallel to the rotational axis of the impeller and a discharge port extending in a direction perpendicular to the rotational axis of the impeller, and   the motor has an oblong cross section that is perpendicular to the rotational axis of the impeller.   
     
     
         2 . The electric pump as in  claim 1 , wherein
 the pump chamber has a cross section that is perpendicular to the rotational axis of the impeller,   the cross section of the pump chamber has an outline such that a distance from the outline to the rotational axis of the impeller changes in a circumferential direction, the distance becoming maximum at a point corresponding to the discharge port,   the oblong cross section of the motor has a first outside dimension in a first direction and a second outside dimension in a second direction perpendicular to the first direction,   a length of the first outside dimension is longer than a length of the second outside dimension, and   the discharge port extends in a direction parallel to the second direction.   
     
     
         3 . The electric pump as in  claim 2 , wherein
 the motor comprises a rotor connected to the impeller and a stator disposed around the rotor, and   when the motor is viewed along the rotational axis of the impeller, a position of a center of the rotor is different from a position of a center of the stator.   
     
     
         4 . The electric pump as in  claim 3 , further comprising a motor driving circuit that drives the motor, wherein
 the casing further comprises a circuit chamber that accommodates the motor driving circuit,   the pump chamber, the motor and the circuit chamber are disposed along the rotational axis of the impeller,   the motor is disposed between the pump chamber and the circuit chamber,   the motor driving circuit comprises a circuit substrate with circuit elements, and   the circuit substrate is parallel or perpendicular to the rotational axis of the impeller.   
     
     
         5 . The electric pump as in  claim 4 , wherein
 the casing further comprises an outer surface with an attaching surface part adapted to be attached to an external device, and   the discharge port projects from the attaching surface part in a direction perpendicular to the attaching surface part.   
     
     
         6 . The electric pump as in  claim 1 , further comprising a motor driving circuit that drives the motor, wherein
 the casing further comprises a circuit chamber that accommodates the motor driving circuit,   the pump chamber, the motor and the circuit chamber are disposed along the rotational axis of the impeller,   the motor is disposed between the pump chamber and the circuit chamber,   the motor driving circuit comprises a circuit substrate with circuit elements, and   the circuit substrate is parallel or perpendicular to the rotational axis of the impeller.   
     
     
         7 . The electric pump as in  claim 6 , wherein
 the pump chamber has a cross section that is perpendicular to the rotational axis of the impeller,   the cross section of the pump chamber has an outline such that a distance from the outline to the rotational axis of the impeller changes in a circumferential direction, the distance becoming maximum at a point corresponding to the discharge port,   the oblong cross section of the motor has a rectangular shape comprising a first side extending in a first direction, and a second side extending in a second direction perpendicular to the first direction,   a length of the first side is longer than a length of the second side, and   the discharge port extends in a direction parallel to the second direction.   
     
     
         8 . The electric pump as in  claim 1 , wherein
 the casing further comprises an outer surface with an attaching surface part adapted to be attached to an external device, and   the discharge port projects from the attaching surface part in a direction perpendicular to the attaching surface part.   
     
     
         9 . The electric pump as in  claim 8 , wherein
 the pump chamber has a cross section that is perpendicular to the rotational axis of the impeller,   the cross section of the pump chamber has an outline such that a distance from the outline to the rotational axis of the impeller changes in a circumferential direction, the distance becoming maximum at a point corresponding to the discharge port,   the oblong cross section of the motor has a rectangular shape comprising a first side extending in a first direction and a second side extending in a second direction perpendicular to the first direction,   a length of the first side is longer than a length of the second side, and   the discharge port extends in a direction parallel to the second direction.   
     
     
         10 . The electric pump as in  claim 9 , wherein
 the motor comprises a rotor connected to the impeller and a stator disposed around the rotor, and   when the motor is viewed along the rotational axis of the impeller, a position of a center of the rotor is different from a position of a center of the stator.   
     
     
         11 . An electric pump comprising:
 a motor;   an impeller driven by the motor; and   a casing comprising a pump chamber that accommodates the impeller,   wherein   the motor and the pump chamber are disposed along a rotational axis of the impeller,   the casing comprises an intake port extending in a direction parallel to the rotational axis of the impeller and a discharge port extending in a direction perpendicular to the rotational axis of the impeller, and   the motor has a rectangular cross section that is perpendicular to the rotational axis of the impeller, the cross section of the motor comprising a first side extending in a first direction and a second side extending in a second direction perpendicular to the first direction.   
     
     
         12 . The electric pump as in  claim 11 , wherein
 the pump chamber has a cross section that is perpendicular to the rotational axis of the impeller,   the cross section of the pump chamber has an outline such that a distance from the outline to the rotational axis of the impeller changes in a circumferential direction, the distance becoming maximum at a point corresponding to the discharge port,   a length of the first side is longer than a length of the second side, and   the discharge port extends in a direction parallel to the second direction.   
     
     
         13 . The electric pump as in  claim 12 , wherein
 the motor comprises a rotor connected to the impeller and a stator disposed around the rotor, and   when the motor is viewed along the rotational axis of she impeller, a position of a center of the rotor is different from a position of a center of the stator.   
     
     
         14 . The electric pump as in  claim 13 , further comprising a motor driving circuit that drives the motor, wherein
 the casing further comprises a circuit chamber that accommodates the motor driving circuit,   the pump chamber, the motor and the circuit chamber arc disposed along the rotational axis of the impeller,   the motor is disposed between the pump chamber and the circuit chamber,   the motor driving circuit comprises a circuit substrate with circuit elements, and   the circuit substrate is parallel or perpendicular to the rotational axis of the impeller.   
     
     
         15 . The electric pump as in  claim 14 , wherein
 the casing further comprises an outer surface with an attaching surface part adapted to be attached to an external device, and   the discharge port projects from the attaching surface part in a direction perpendicular to the attaching surface part.