Wet vacuum machine

Claim 2

A suction power unit for use with a wet vacuum machine comprising a housing, a first electric motor-centrifugal fan arrangement provided in the housing, the first centrifugal fan having an axis of rotation, inlet means communicating axially with the fan, an exhaust chamber defined radially of the centrifugal fan, means hermetically isolating the motor of said first centrifugal fan from said exhaust chamber, the exhaust chamber being defined by walls of the housing including a top wall in a plane at right angles to the axis of the first centrifugal fan, an inlet aperture defined in the top wall of the exhaust chamber, a second centrifugal fan arranged in said housing having an axis of rotation parallel to but spaced from the axis of rotation of the first centrifugal fan, the inlet aperture communicating axially with the second centrifugal fan, a second exhaust chamber formed radially of the second centrifugal fan, and means hermetically isolating the motor of the second centrifugal fan from the second exhaust chamber, and exhaust ports communicating said second chamber with the atmosphere.

Claim 3

An apparatus as defined in claim 1, wherein the motor of the first centrifugal fan is located in a circulation chamber defined by the housing and hermetically isolated from the exhaust chamber of the first centrifugal fan and the motor of the second centrifugal fan is provided in a separate circulating chamber defined by the housing and hermetically isolated from the exhaust chamber of the second centrifugal fan.

Claim 4

A wet vacuum apparatus including a housing, a suction system within said housing, the housing including a first closed wall and a second partition wall spaced from the first wall inwardly of the housing and parallel to the first wall, a third partition wall perpendicular to the second wall, and a fourth partition wall spaced from the second wall inwardly of the housing and parallel to the second wall and forming a closed chamber with said second and third walls and the wall of the housing, the first wall defining an air inlet, a first centrifugal blower unit having a first centrifugal blowing fan mounted to the second wall such that the blower fan is between the first and second walls with the air inlet aligned with the axis of rotation of the fan and with the electric motor of said centrifugal blower located on the opposite side of said second wall to the first wall such that the motor is isolated from the air passage formed between the first and second walls, an air inlet opening formed in said second wall spaced from the first centrifugal blower unit, a second centrifugal blower unit having a second centrifugal blower fan mounted to the fourth wall such that the second blower fan is located in said chamber between the second and fourth walls, and the axis of rotation is aligned with the inlet opening in the second wall, the motor of the second centrifugal blower unit located on the opposite side of the fourth wall from the second wall such that it is hermetically isolated from the air passage formed between the first and second walls and exhaust ports provided in the housing wall communicating the chamber between the second and fourth walls with the atmosphere.

Claim 5

A wet vacuum apparatus including a housing, a suction system within said housing, the housing including a first closed wall and a second partition wall spaced from the first wall inwardly of the housing and parallel to the first wall, a third partition wall perpendicular to the second wall, and a fourth partition wall spaced from the second wall inwardly of the housing and parallel to the second wall and forming a closed chamber with said second and third walls and the wall of the housing, the first wall defining an air inlet, a first centrifugal blower unit having a first centrifugal blowing fan mounted to the second wall such that the blower fan is between the first and second walls with the air inlet aligned with the axis of rotation of the fan and with the electric motor of said centrifugal blower located on the opposite side of said second wall to the first wall such that the motor is isolated from the air passage formed between the first and second walls, an air inlet opening formed in said second wall spaced from the first centrifugal blower unit, a second centrifugal blower unit having a second centrifugal blower fan mounted to the fourth wall such that the second blower fan is located in said chamber between the second and fourth walls, and the axis of rotation is aligned with the inlet opening in the second wall, the motor of the second centrifugal blower unit located on the opposite side of the fourth wall from the second wall such that it is hermetically isolated from the air passage formed between the first and second walls and exhaust ports provided in the housing wall communicating the chamber between the second and fourth walls with the atmosphere.

Claim 6

An apparatus as defined in claim 3, wherein an air filter surrounds the first inlet opening in the first closed wall and air flow passing through the inlet passes first through the air filter.

Claim 7

An apparatus as defined in claim 4, wherein the second and third walls defining with the housing a circulating chamber surrounding the motor of the first centrifugal blower and a series of venting ports being provided in the housing wall communicating with the circulating chamber of the first motor, said circulating chamber being hermetically isolated from the exhaust chamber formed between the first and second walls and the exhaust chamber formed between the second, third and fourth walls, the third and fourth walls and the wall of the housing defining a second circulating chamber surrounding the motor of the second centrifugal blower and venting ports are provided in the housing wall communicating the second circulating chamber with the atmosphere to allow circulating air to pass through the chamber, said second circulating chamber being hermetically isolated from the other chambers.

Claim 8

An apparatus as defined in claim 4, wherein the axis of rotation of the first centrifugal blower is spaced from the axis of rotation of the second centrifugal blower and the second centrifugal blower is stepped such that the central inlet of the fan of the second centrifugal blower is higher relatively in the housing than the centrifugal fan of the first centrifugal blower.