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A one-piece soundproofing panel which is attached within an circumferential air blower casing of a turbomachine, with an axis, in which circulates an airflow from upstream to downstream, is disclosed. The panel includes a circumferential rigid seat with a longitudinal cylindrical part, arranged to a

A one-piece soundproofing panel which is attached within an circumferential air blower casing of a turbomachine, with an axis, in which circulates an airflow from upstream to downstream, is disclosed. The panel includes a circumferential rigid seat with a longitudinal cylindrical part, arranged to axially extend with respect to the axis A of the turbomachine, having an outside surface, intended to come to extend facing with an internal surface of the air blower casing, and an internal surface to which is applied a soundproofing coating; and an annular fastening flange, formed at the upstream end of the longitudinal cylindrical part, radially outwardly extending, the fastening flange being arranged to cooperate with a fastening flange of the air blower casing.

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1. A one-piece soundproofing panel attached within an circumferential air blower casing of a turbomachine, comprising an axis, in which circulates an airflow from upstream to downstream, the panel comprising: a circumferential rigid seat comprising: a longitudinal cylindrical part axially extending

1. A one-piece soundproofing panel attached within an circumferential air blower casing of a turbomachine, comprising an axis, in which circulates an airflow from upstream to downstream, the panel comprising: a circumferential rigid seat comprising: a longitudinal cylindrical part axially extending with respect to the axis of the turbomachine, the cylindrical part comprising an outside surface, which faces an internal surface of the air blower casing, and an internal surface to which a soundproofing coating is applied; andan annular fastening flange formed at an upstream end of the longitudinal cylindrical part and radially outwardly extending, the fastening flange being cooperating with a fastening flange of the air blower casing,wherein a length of the panel is provided such that the cylindrical part fills a longitudinal space between an upstream annular layer attached to an internal cylindrical surface of an inlet duct and a downstream annular layer attached to the internal surface of the air blower casing just in front of blades of an air blower, the downstream annular layer including an abradable material which comes into contact with the blades of the air blower, andwherein a radial thickness of an upstream end of the soundproofing coating is adapted so that internal surfaces of the upstream annular layer and of the soundproofing coating are continuous at a first interface therebetween, and a radial thickness of a downstream end of the soundproofing coating is adapted so that internal surfaces of the downstream annular layer and of the soundproofing coating are continuous at a second interface therebetween. 2. The panel according to claim 1, wherein a downstream end of the panel comprises a support device which maintains the outside surface of the panel near the internal surface of the air blower casing. 3. The panel according to claim 2, wherein the support device is formed in the soundproofing coating of the insulation panel. 4. The panel according to claim 1, wherein at least one of the upstream or downstream ends of the soundproofing coating includes a rigid reinforcement. 5. The panel according to claim 1, wherein the soundproofing coating includes a one-piece sandwich panel comprising at least a honeycomb layer covered with a perforated skin. 6. A turbomachine, intended for the propulsion of an aircraft, comprising a turbomachine axis in which circulates an airflow from upstream to downstream, the turbomachine comprising: a circumferential air blower casing;a circumferential inlet duct mounted upstream to the air blower casing; anda soundproofing panel according to claim 1,wherein the fastening flange of the soundproofing panel extends between the inlet duct and the air blower casing. 7. The turbomachine according to claim 6, wherein the air blower casing comprises an upstream fastening flange, the inlet duct comprises a downstream fastening flange, and the fastening flange of the panel extends between the fastening flanges of the inlet duct and the air blower casing. 8. The turbomachine according to claim 7, wherein the fastening flanges of the inlet duct, the air blower casing and the insulation panel are together made fastened together by a fastener longitudinally extending with respect to the axis of the turbomachine. 9. The turbomachine according to claim 6, wherein the turbomachine comprises a support device at a downstream end of the soundproofing panel in an element of the air blower casing. 10. A method for the assembly of a turbomachine according to claim 6, comprising: mounting the soundproofing panel to the air blower casing so that the outside surface of its rigid seat is facing with the internal surface of the air blower casing, the fastening flange of the soundproofing panel being in contact with a upstream fastening flange of the air blower casing;placing a downstream fastening flange of the inlet duct in contact with the fastening flange of the soundproofing panel; andfastening together the fastening flanges of the inlet duct, the soundproofing panel and the air blower casing. 11. The panel according to claim 2, wherein the downstream end of the panel includes an annular tongue which fits into an annular groove provided in an element of the air blower casing. 12. The panel according to claim 2, wherein the downstream end of the panel has a conical surface presenting a first seating surface which is flared from upstream towards downstream, and cooperating with a conical surface provided on the downstream annular layer of the air blower casing presenting a second seating surface which is flared from downstream towards upstream. 13. The turbomachine according to claim 9, wherein the downstream end of the panel includes an annular tongue which fits into an annular groove provided in the element of the air blower casing, the annular groove being formed between the internal surface of the air blower casing and an annular tongue formed in the downstream annular layer of the air blower casing. 14. The turbomachine according to claim 13, wherein a radially thickness of the tongue at the downstream end of the panel is substantially equal to a radial thickness of the tongue formed in the downstream annular layer. 15. The turbomachine according to claim 13, wherein a radially thickness of the tongue at the downstream end of the panel is greater than a radial thickness of the tongue formed in the downstream annular layer. 16. The turbomachine according to claim 9, wherein the downstream end of the panel has a conical surface presenting a first seating surface which is flared from upstream towards downstream. 17. The turbomachine according to claim 16, wherein the first seating surface cooperates with a conical surface provided on the downstream annular layer of the air blower casing presenting a second seating surface which is flared from downstream towards upstream. 18. The turbomachine according to claim 16, wherein the first seating surface cooperates with an interface element mounted to an upstream radial face of the downstream annular layer, the interface element including a downstream radial wall attached to the downstream annular layer and a skew upstream wall presenting a second seating surface.