Cooling airflow electric motor-driven pump

Abstract

An improved cooling airflow electric motor-driven pump, particularly adapted for pumping condensate from refrigeration and air conditioning systems includes a reservoir body, a reservoir cover supporting an electric motor directly connect to a centrifugal pump impeller at one end of the motor rotor shaft and to an open radial blade blower wheel at the opposite end of the motor rotor shaft. The motor is mounted on the reservoir cover and a motor cover mounted on the reservoir covers defines an aerothermodynamically matched blower wheel shroud and cooling air inlet and discharge ports for the flow of cooling air across the motor and associated electronic controls.

1 . An improved cooling airflow electric motor-driven pump comprising:
 a reservoir body including a reservoir chamber for collecting liquid;   a reservoir cover releasably connected to and disposed over the reservoir body and including a fluid inlet port for conducting liquid to the reservoir chamber;   an open radial blade blower wheel for cooling air flow;   an electric motor mounted on the reservoir cover including a first shaft part drivingly connected to a pump impeller and a second shaft part drivingly connected to the blower wheel;   and a motor cover disposed over the motor and the blower wheel, the motor cover being releasably mounted on the reservoir cover, the motor cover including a blower wheel shroud aerothermodynamically matched to the blower wheel, an air scoop proximately located adjacent to the blower wheel shroud and disposed in a second part of the motor cover, and a means forming at least one cooling airflow flue disposed in a third part of the motor cover and formed between the air scoop second part and a fourth part of the motor cover.   
   
   
       2 . The improved cooling airflow pump of  claim 1  wherein:
 the blower wheel shroud of the motor cover comprises   a generally cylindrical part and   is provided with a plurality of spaced apart tangential slots extending generally vertically about the blower wheel shroud periphery forming cooling air discharge ports and adjacent to the blower wheel when the motor cover is disposed on the reservoir cover to provide for cooling air discharge from a cooling air discharge chamber formed by the air scoop second part of the motor cover.   
   
   
       3 . The improved cooling airflow pump of  claim 1  wherein:
 the fourth part of the motor cover comprises   a generally rectangular part and   is provided with a plurality of vertically extending spaced apart slots forming cooling air inlet ports disposed in the fourth part of the motor cover and spaced from the reservoir cover.   
   
   
       4 . The improved cooling airflow pump of  claim 1  wherein:
 the blower wheel shroud of the motor cover is integrally joined to the air scoop second part of the motor cover and the fourth part of the motor cover and   the blower wheel shroud of the motor cover forms a cover for at least of a portion of the motor.   
   
   
       5 . The improved cooling airflow pump of  claim 1  wherein:
 the cooling air flow flue third part of the motor cover is integrally joined to the air scoop second part of the motor cover and the fourth part of the motor cover, and   the cooling air flow flue third part of the motor cover forms a cover for at least the float control electronics for controlling operation of the motor.   
   
   
       6 . An improved cooling airflow electric motor-driven pump comprising:
 a reservoir body including a reservoir chamber for collecting liquid;   a reservoir cover releasably connected to and disposed over the reservoir body;   an open radial blade blower wheel for cooling air flow;   an electric motor mounted on the reservoir cover including a first vertically extending shaft part drivingly connected to a pump impeller and a second vertically shaft part drivingly connected to the blower; and   a motor cover disposed over the motor and the blower wheel, the motor cover being releasably mounted on the reservoir cover, the motor cover including a generally cylindrical first part of the motor cover forming a cooling air shroud and covering the blower wheel, a plurality of spaced apart tangential slots extending generally vertically formed in the first part of the motor cover adjacent to the blower wheel when the motor cover is disposed on the reservoir cover to provide for cooling air discharge from the cooling air shroud formed by the first part of the motor cover, an air scoop disposed in a second part of the motor cover, a means forming at least one cooling airflow flue disposed in a third part of the motor cover, a generally rectangular fourth part of the cover, and a plurality of vertically extending spaced apart slots forming cooling air inlet ports disposed in the fourth part of the motor cover and spaced from the reservoir cover.   
   
   
       7 . The improved cooling airflow pump of  claim 6  wherein:
 the first part of the motor cover is integrally joined to the second and fourth parts of the motor cover, and   the first part of the motor cover forms a cover for at least a portion of the motor.   
   
   
       8 . The improved cooling airflow pump of  claim 6  wherein:
 the third part of the motor cover is integrally joined to the second and fourth parts of the motor cover, and   the third part of the motor cover forms a cover for at least the float control electronics for controlling operation of the motor.   
   
   
       9 . An improved cooling airflow electric motor-driven pump comprising:
 a reservoir body including a reservoir chamber for collecting liquid;   a reservoir cover releasably connected to and disposed over the reservoir body;   a fluid inlet port for conducting liquid to the reservoir chamber,   an open radial blade blower wheel for cooling air flow;   an electric motor mounted on the reservoir cover including a first shaft part drivingly connected to a pump impeller and a second shaft part drivingly connected to the blower wheel; and   a motor cover disposed over the motor and the blower wheel, the motor cover being releasably mounted on the reservoir cover, the motor cover including a plurality of spaced apart tangential slots extending generally vertically forming cooling air discharge ports and disposed in a first generally cylindrical part of the motor cover, and a plurality of vertically extending spaced apart slots forming cooling air inlet ports disposed in a second part of the motor cover and spaced from the reservoir cover.   
   
   
       10 . The improved cooling airflow pump of  claim 9  wherein:
 the first part of the motor cover is integrally joined to the second part, and   the first part of the motor cover forms a cooling air discharge shroud containing at least part of the motor and the blower wheel.   
   
   
       11 . The improved cooling airflow pump of  claim 9  wherein:
 the second part of the motor cover is integrally joined to the first, and   the second part of the motor cover forms a cover for at least the float control electronics for controlling operation of the motor.   
   
   
       12 . An improved cooling airflow device for an electric motor-driven condensate pump, the device comprising:
 a cover having a generally cylindrical first part, a generally teardrop-shaped second part, a generally trapezoidal third part and a generally rectangular fourth part;   a plurality of spaced apart tangential slots extending generally vertically disposed in the first part of the cover and forming cooling air discharge ports;   a plurality of vertically extending spaced apart slots disposed in the fourth part of the motor cover and forming cooling air inlet ports; and   an open radial blade blower wheel aerothermodynamically coupled to the cooling air inlet and discharge ports to optimize airflow across the electric motor to dissipate heat.   
   
   
       13 . The improved cooling airflow device of  claim 12  wherein:
 the first part of the motor cover is integrally joined to the second and fourth parts of the motor cover, and   the first part of the motor cover forms a cooling air discharge shroud containing at least part of the motor and the blower wheel.   
   
   
       14 . The improved cooling airflow device of  claim 12  wherein:
 the third part of the motor cover is integrally joined to the second and fourth parts of the motor cover, and   the third part of the motor cover forms a cover for at least the float control electronics for controlling operation of the motor.