Vacuum filter assembly for cleansing air for use in transfer of bulk, granular material as in conveying vehicles

A vacuum filter assembly for a tank trailer comprising:

• a filter canister, the filter canister having a top of the filter canister and a bottom of the filter canister, a dusty air inlet on the filter canister proximate the bottom of the filter canister and a clean air outlet on the filter canister proximate the top of the filter canister;
• a dust filtering system suspended in the filter canister, the dust filtering system comprising a tube sheet traversing an upper segment of the filter canister and at least one filtration tube suspended from the tube sheet and extending downward into the filter canister;
• a grommet extending through the tube sheet, the grommet being connected to the at least one filtration tube and the grommet being connected to the tube sheet;
• a vacuum connection connecting the clean air outlet on the filter canister to a blower assembly, the blower assembly being operable to generate a vacuum in the filter canister and draw dust laden air through the dusty air inlet on the filter canister into the bottom of the filter canister and through the dust filtering system cleaning the dust laden air in response to operation of the blower assembly;
• a back flush valve on an incoming airline communicating with the clean air outlet on the filter canister, the back flush valve being operable to open and communicate an air flow in an opposite direction through the at least one filtration tube of the dust filtering system and unclog dust from the at least one filtration tube.

A vacuum filter assembly comprising:

• a filter canister, the filter canister having a top of the filter canister and a bottom of the filter canister;
• a dusty air inlet on the filter canister at the bottom of the filter canister;
• a clean air outlet on the filter canister at the top of the filter canister;
• a dust filtering system in the filter canister, the dust filtering system comprising a tube sheet traversing an upper segment of the filter canister and at least one filtration tube suspended from the tube sheet and extending downward into the filter canister;
• a blower assembly;
• a vacuum connection connecting the clean air outlet on the filter canister with the blower assembly, the blower assembly being operable to create a vacuum that is communicated through the vacuum connection and the clean air outlet on the filter canister to an interior of the filter canister to draw dust laden air through the dusty air inlet on the filter canister into the bottom of the filter canister and through the at least one filtration tube of the dust filtering system cleaning the air in response to operation of the blower assembly;
• and
• a back flush valve communicating with the vacuum connection and the clean air outlet on the filter canister, the back flush valve being operable to open and communicate an air flow in an opposite direction through the clean air outlet and the at least one filtration tube of the dust filtering system to unclog dust from the at least one filtration tube.