Modular system for producing a screw spindle pump

A modular system for constructing a screw spindle pump, comprising:

• a drive spindle;
• at least one running spindle to mesh with the drive spindle to move fluid from a fluid inlet to a fluid outlet in an axial direction;
• and
• a housing including:
• a basic housing component having the fluid inlet and a basic pump chamber,
• a housing pressure component having the fluid outlet and forming a pressure chamber,
• a housing cover arrangeable on the basic housing component, and
• a plurality of identical intermediate housing components, wherein any number of the intermediate housing components is selectively arrangeable between the basic housing component and the housing pressure component so as to form a corresponding number of additional pump chambers that together with the basic pump chamber form a common pump chamber,
• the at least one running spindle including:
• at least one running spindle base element arrangeable in the basic housing component, and a plurality of identical running spindle extension elements, wherein any number of the running spindle extension elements is selectively arrangeable in the selected number of intermediate housing components so that the at least one running spindle base element and the number of running spindle extension elements form the running spindle,
• wherein the housing cover is configured to support the at least one running spindle, wherein when the drive spindle, the at least one running spindle and the housing are configured so that when the drive spindle, the at least one running spindle and the housing are assembled the drive spindle extends parallel to the at least one running spindle, through the housing pressure component and into the basic pump chamber so that the drive spindle and the at least one running spindle move the fluid from the fluid inlet to the fluid outlet.