Liquid extraction machine
First Claim
1. A machine for extracting liquid from a surface, such as carpeting, said machine comprising,a main housing,a vacuum pump in the main housing for creating a vacuum to extract liquid from the surface,a motor in the main housing for driving said vacuum pump, said vacuum pump having an exhaust,an exhaust duct for conducting exhaust air from the exhaust of the vacuum pump to an opening in the main housing for exhaust to the environment,a constriction in said exhaust duct for reducing the pressure of exhaust air flowing through the exhaust duct from a first pressure upstream from the constriction to a second lower pressure in a low pressure zone adjacent the constriction,a compartment having an inlet for entry of ambient air into the compartment and an outlet for exit of air from the compartment,a second motor within the compartment,a cooling duct having an inlet communicating with the outlet of the compartment and an outlet communicating with said low pressure zone in said exhaust duct, said second lower pressure of the exhaust air in said low pressure zone being less than ambient pressure thereby to cause a flow of cooling ambient air into the compartment, through the compartment and into the cooling duct, and then into the exhaust duct for exhaust out of the main housing.
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Accused Products
Abstract
An extraction machine of this invention comprises a main housing. A vacuum pump in the main housing operates to create a vacuum to extract liquid from the surface. A motor in the main housing drives the vacuum pump, the vacuum pump having an exhaust. An exhaust duct conducts exhaust air from the exhaust of the vacuum pump to an opening in the main housing for exhaust to the environment. A constriction in the exhaust duct reduces the pressure of exhaust air flowing through the exhaust duct from a first pressure upstream from the constriction to a second lower pressure in a low pressure zone adjacent the constriction. A compartment has an inlet for entry of ambient air into the compartment and an outlet for exit of air from the compartment. A second motor is located within the compartment. A cooling duct has an inlet communicating with the outlet of the compartment and an outlet communicating with the low pressure zone in the exhaust duct. The second lower pressure of the exhaust air in the low pressure zone is less than ambient pressure thereby to cause a flow of cooling ambient air into the compartment, through the compartment and into the cooling duct, and then into the exhaust duct for exhaust out of the main housing.
31 Citations
18 Claims
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1. A machine for extracting liquid from a surface, such as carpeting, said machine comprising,
a main housing, a vacuum pump in the main housing for creating a vacuum to extract liquid from the surface, a motor in the main housing for driving said vacuum pump, said vacuum pump having an exhaust, an exhaust duct for conducting exhaust air from the exhaust of the vacuum pump to an opening in the main housing for exhaust to the environment, a constriction in said exhaust duct for reducing the pressure of exhaust air flowing through the exhaust duct from a first pressure upstream from the constriction to a second lower pressure in a low pressure zone adjacent the constriction, a compartment having an inlet for entry of ambient air into the compartment and an outlet for exit of air from the compartment, a second motor within the compartment, a cooling duct having an inlet communicating with the outlet of the compartment and an outlet communicating with said low pressure zone in said exhaust duct, said second lower pressure of the exhaust air in said low pressure zone being less than ambient pressure thereby to cause a flow of cooling ambient air into the compartment, through the compartment and into the cooling duct, and then into the exhaust duct for exhaust out of the main housing.
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12. A cooling system for use in a machine of the type comprising a main housing having an opening therein, a motor-driven unit in the main housing, a compartment having an inlet for entry of ambient air into the compartment and an outlet for exit of air from the compartment, and a motor in the compartment,
the cooling system comprising an exhaust duct for conducting exhaust air from the motor-driven unit to the opening in the main housing, a constriction in said exhaust duct for reducing the pressure of exhaust air flowing through the exhaust duct from a first pressure upstream from the constriction to a second lower pressure in a low pressure zone adjacent the constriction, and a cooling duct connecting the outlet of said compartment to the low pressure zone in the exhaust duct, said second lower pressure of the exhaust air in said low pressure zone being less than ambient pressure thereby to cause a flow of cooling ambient air into said compartment, through the compartment and into the cooling duct, and then into the exhaust duct for exhaust through the exhaust duct outlet.
Specification