Heat exchanging means for a pump motor using a bypass tube within a recirculating water system

A pump which is designed to be mounted within a recirculating water system where a portion of the recirculating water is diverted (bypass water) and cause to flow through the motor chamber with this recirculating water to absorb heat that is produced during the operation of the motor. The heated bypass water is then added back to the recirculating water. The pump includes an electric motor which is mounted within a pump motor chamber of a motor housing and is completely enclosed therein. The pump motor chamber is filled with oil thereby submerging of the electric motor in oil. A water conducting tube is mounted within the pump motor chamber and surrounds the electric motor. The tube inlets water from the pressure side of the pump impeller, conducts this bypass water entirely through the tube and then discharges the bypass water into the inlet of the recirculating water to the pump impeller. The heat that is produced in the operation of the motor is absorbed by the oil which in turn is conducted through the tube to be absorbed by the bypass water prior to being added back into the recirculating water.

If you were to search for Heat exchanging means for a pump motor using a bypass tube within a recirculating water system using relaxed search criteria, these patents would come up:

What is claimed is:

1. A pump for use in a recirculating water system comprising:

an electric motor having an output shaft, said output shaft having a rotational axis, an impeller connected to said output shaft, said impeller located in an impeller chamber, rotation of said impeller results in liquid flowing through saidimpeller chamber from an inlet to an outlet, rotation of said impeller moves the liquid toward said outlet creating a pressurized environment within said impeller chamber;

a pump motor housing having a pump motor chamber with said electric motor being located within said pump motor chamber, said impeller located exteriorly of said pump motor chamber, a tube located within said pump motor chamber, said tube beingcapable of conducting liquid from said pressurized environment through an outlet connection to said inlet, whereby said liquid within said tube is to absorb heat from said electric motor resulting in heating of said liquid and then result in dischargingof the liquid in said tube into said inlet; and

said tube forming a plurality of U-shaped sections, each said U-shaped section having a pair of legs, each said leg located parallel to said rotational axis whereby the configuration of said tube will allow complete draining of liquid from withinsaid tube by gravity.

2. The pump as defined in claim 1 including:

oil substantially filling said pump motor chamber submerging said electric motor and said tube, whereby heat from the operation of said electric motor is absorbed by said oil causing said oil to rise in temperature with this heat in said oilbeing absorbed by said liquid within said tube causing the temperature of said liquid to rise.

3. A pump for use in a recirculating water system comprising:

an electric motor having an output shaft, said electric motor located in a motor chamber, said output shaft having a rotational axis, an impeller connected to said output shaft, said impeller located in an impeller chamber, rotation of saidimpeller is to result in liquid flowing through said impeller chamber from a main liquid inlet to a main liquid outlet, said impeller chamber being separated from said motor chamber;

a liquid conducting tube located within said motor chamber, said liquid conducting tube surrounding said electric motor, said liquid conducting tube having a bypass inlet connecting with said impeller chamber, said liquid conducting tube having abypass outlet connecting with said main liquid inlet; and

said tube being formed of a plurality of U-shaped sections, each said U-shaped section having a pair of legs, each said leg located parallel to said rotational axis, whereby the configuration of said tube is to maximize the extraction of heatthat is produced from said electric motor by absorbing of the heat contained within the liquid within said tube.

4. A pump for use in a recirculating water system comprising:

an electric motor having an output shaft, said output shaft having a rotational axis, an impeller connected to said output shaft, said impeller located in an impeller chamber, rotation of said impeller results in liquid flowing through saidimpeller chamber from an inlet to an outlet, rotation of said impeller moves the liquid toward said outlet creating a pressurized environment within said impeller chamber;

a pump motor housing having a pump motor chamber with said electric motor being located within said pump motor chamber, said impeller located exteriorly of said pump motor chamber, a tube located within said pump motor chamber, said tube beingcapable of conducting liquid from said pressurized environment through an outlet connection to said inlet, whereby said liquid within said tube is to absorb heat from said electric motor resulting in heating of said liquid and then result in dischargingof the liquid in said tube into said inlet; and

said outlet connection utilizes a pair of deflectable grommets and a rigid spacer, said grommets and said spacer being mounted on said tube with said spacer located between said grommets, said spacer and said grommets being movable on said tube,said grommets being compressingly deformed by being moved on said tube toward each other pressing each said grommet into tight engagement with said spacer establishing a liquid tight connection between said pump motor housing and said tube.

5. The pump as defined in claim 4 wherein:

said spacer including at least one hole, said hole to provide for leakage of liquid externally of said pump motor housing.