Conveyor device having an elestically deformable element with a counter surface extending over three arc sections

A conveyor device for at least conveying a fluid, the conveyor device comprising:

• a conveyor chamber having a dimensionally stable conveyor chamber element that at least partially delimits the conveyor chamber;
• an elastically deformable and annular conveyor element surrounding a drive axis, the elastically deformable and annular conveyor element is a conveyor membrane, that delimits the conveyor chamber together with the conveyor chamber element and is arranged radially within the conveyor chamber element relative to the drive axis, wherein the conveyor element has a sealing extension that is designed integrally with a base body of the conveyor element and at least partially arranged in a sealing groove of the conveyor chamber element when the conveyor element is arranged radially within the conveyor chamber element, characterized in that the conveyor chamber element has a counter surface for interacting with a conveying surface of the base body of the conveyor element in order to convey the fluid, wherein said counter surface extends over at least three circular arc sections that are arranged successively and contiguously when viewed in a cross section, and wherein at least one edge region of the conveyor chamber element delimiting the sealing groove is arranged such that it borders directly on at least one of the at least three circular arc sections, wherein the sealing groove completely extends around the counter surface of the conveyor chamber element, which interacts with the conveying surface of the base body of the conveyor element in order to convey the fluid, and in that the sealing groove delimits the counter surface.