Powder conveying chamber for a dense phase powder pump and dense phase powder pump comprising a powder conveying chamber

A powder conveying chamber for a dense phase powder pump for conveying powder, wherein the powder conveying chamber comprises at least one air exchange opening which is designed and formed separately from a cleaning air outlet of an end region of the powder conveying chamber, for alternately connecting fluidly to a vacuum line or vacuum source or to a compressed air supply line or compressed air source for drawing powder into the powder conveying chamber, or pneumatically expelling a portion of powder present within the powder conveying chamber, wherein the end region of the powder conveying chamber is fluidly connected or connectable to a powder line, and is configured as a transition region and designed to reduce an effective sectional area of flow of the powder conveying chamber to an effective sectional area of flow of the powder line and/or to an effective sectional area of flow of a valve, arranged between the powder conveying chamber and the powder line,

• wherein:
• the end region is allocated a cleaning system via which cleaning air in the form of compressed air can be supplied to the end region, in order to keep the end region free of powder deposits or to remove deposits of powder at the end region;
• and
• at least part of a wall area of the end region forming the end region of the powder conveying chamber is designed as a porous wall area more permeable to compressed air but less permeable to powder.