Stator for a fluid machine, fluid machine comprising such a stator, and method for manufacturing such a stator

A stator configured for a fluid machine selected from the group consisting of a centripetal turbomachine and a centrifugal compressor, the stator comprising:

• a volute in the form of a channel defined about a main axis of the stator and delimited by a side wall comprising a first end wall and a second end wall opposite the first end wall in a direction parallel to the main axis, the side wall also comprising an internal perimeter adjacent the main axis and an external perimeter opposite the internal perimeter in a direction perpendicular to the main axis, the first end wall and the second end wall defining a maximum height of the volute, the internal perimeter and the external perimeter defining a maximum width of the volute;
• a pipe connected to the volute and extending along the main axis, the pipe and the volute delimiting a circuit for the flow of a fluid between an inlet section and an outlet section;
• and
• a set of one or more vanes arranged in the circuit for the flow of the fluid,
• wherein the volute, the pipe and the set of one or more vanes are produced in a single piece by an additive manufacturing process, in that the ratio of the maximum width to the maximum height of the volute is less than or equal to 30%, and in that, except for a portion of the second end wall and a portion of the first end wall each having a chord of length less than or equal to 70% of the maximum width, any plane tangent to the side wall of the volute forms an angle of less than 45° in absolute terms with the main axis.