Nozzle with a first passage and second passages surrounding the first passage and nozzle arrangement

A nozzle for cleaning a filter element by means of a fluid flow, comprising:

• a first nozzle section configured as a hollow truncated cone;
• a first passage, wherein the first passage forms a first nozzle opening in a top surface of the first nozzle section;
• and
• a plurality of second passages surrounding the first passage, wherein the second passages form second nozzle openings in a lateral surface of the first nozzle section,
• wherein the plurality of second passages each comprise a passage axis that is angled with respect to a parallel axis that extends parallel to a center axis of the nozzle, in order to impart a helical flow contour on the fluid flow.

A nozzle assembly for cleaning a filter element by means of a fluid flow, comprising:

• a tubular feed line having a feed line opening defined in a lateral surface of the feed line;
• at least one nozzle designed as a hollow body with a base surface, wherein the nozzle defines an inlet opening in the base surface;
• and
• at least one nozzle holder comprising a receptacle for the nozzle,
• wherein the nozzle defines a recess at the base surface for abutment against the lateral surface of the feed line, such that the inlet opening abuts against the feed line and is aligned with the feed line opening, and
• wherein the nozzle is releasably held and centered at the receptacle of the nozzle holder and the nozzle holder is releasably held at the feed line.