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A housing for a fan or blower, in particular an axial fan, includes a wall ring (2) having an inlet nozzle section (3), an outer diffuser (6) having an inlet flow opening (7) and an outlet flow opening (8), and a holder for an electric motor (9) of the fan. The holder is arranged in an inner space o

A housing for a fan or blower, in particular an axial fan, includes a wall ring (2) having an inlet nozzle section (3), an outer diffuser (6) having an inlet flow opening (7) and an outlet flow opening (8), and a holder for an electric motor (9) of the fan. The holder is arranged in an inner space of the housing. The outer diffuser (6) is formed by at least two partial ring sections that are connected to the outer circumferential surface via mechanical connection elements. The holder includes several struts (14) that are fastened to an inner circumferential surface of the outer diffuser (6) by one end, are circumferentially spaced apart, and are fastened in the edge region of the inlet flow opening (7). The struts can be installed by their other end to a motor flange (16) of the motor housing (17) of the electric motor (9).

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1. A housing for an axial fan (1), comprising a wall ring (2) with an inlet nozzle section (3) and an outflow side, the wall ring (2) configured for surrounding a blade wheel,an annular outer diffuser (6) connected to the wall ring (2) on the outflow side of the wall ring (2),a holder for an electri

1. A housing for an axial fan (1), comprising a wall ring (2) with an inlet nozzle section (3) and an outflow side, the wall ring (2) configured for surrounding a blade wheel,an annular outer diffuser (6) connected to the wall ring (2) on the outflow side of the wall ring (2),a holder for an electric motor (9) of the axial fan (1), the holder being arranged in an inner space of the housing,an inner diffuser (26) arranged inside the outer diffuser (6),a motor housing (17) of the electric motor (9) disposed inside the inner diffuser (26), anda protective grid (36) being fastened to the outer diffuser (6),wherein the outer diffuser (6) having an inlet flow opening (7) and an outlet flow opening (8) and being formed from at least two partial ring sections (12), which are connected via mechanical connecting elements (13) on an outer circumferential surface of the outer diffusor (6), the outer diffusor (6) widening conically from the inlet flow opening (7) toward the outlet flow opening (8) at a cone angle (α) with respect to a central longitudinal axis (X-X), andthe holder being formed of several struts (14) to be fastened to an inner circumferential surface of the outer diffuser (6) at first strut ends, the struts (14) being circumferentially spaced apart and fastened at the first strut ends in an edge region of the inlet flow opening (7), the struts (14) being configured to be installed to a motor flange (16) of the motor housing (17) of the electric motor (9) at second strut ends opposite the first strut ends,the inner diffuser (26) axially extending from the inlet flow opening (7) to the outlet flow opening (8) of the outer diffuser (6) and having a closed circumferential wall (27), the inner diffuser (26) configured to be connected near the inlet flow opening (7) to the motor flange (16) of the motor housing (17), wherein the motor housing (17) is disposed axially between the protective grid and the wall ring (2),the protective grid (36) being fastened in an opening plane of the outlet flow opening (8) of the outer diffuser (6), the opening plane running perpendicular to the central longitudinal axis (X-X) and axially spaced from the motor housing, the protective grid (36) being connected to the outer diffuser (6) by an outer circumferential edge (37),wherein the outer diffuser (6) has recesses (41) in a circumferential wall near the outlet flow opening (8) for accommodating grid wires (38) of the protective grid (36) and wall surfaces (31) of the inner diffuser (26) have recesses (44) at a free end in the edge region to accommodate the grid wires (38), andwherein the inner diffuser (26) has an end cover (43), covering a central portion of the protective grid (36) on a side facing the outflow direction, the end cover connected to an air guiding section (29) of the inner diffuser via fastening elements in such a way that the protective grid (36) is axially enclosed between the end cover (43) and the air guiding section (29). 2. The housing according to claim 1, wherein the outer diffuser (6) is formed from four partial ring sections (12). 3. The housing according to claim 1, wherein the struts are four spaced apart struts (14), each comprising two parallel spokes. 4. The housing according to claim 1, wherein the inlet flow opening (7) and the outlet flow opening (8) of the outer diffuser (6) are circular in cross section and wherein the cone angle (a) with respect to the central longitudinal axis (X-X) is 10° to 18°. 5. The housing according to claim 1, wherein the outer diffuser (6) is made of plastic. 6. The housing according to claim 1, further comprising the blade wheel (11) with fan blades arranged in the wall ring (2), wherein the outer diffuser (6) has a height (L) measured along the central longitudinal axis (X-X) above the fan blades, the height (L) being greater than or equal to 200 mm to including 800 mm, with a ratio L/D1 of 0.25 to 1.0, with D1 being the diameter of the inlet flow opening (7) and L being the height of the outer diffuser (6). 7. The housing according to claim 1, wherein the circumferential wall (27) in the connecting region for the motor flange (16) has an annular section (28), which is circular in cross section, which tapers into the air guiding section (29) with an especially square cross section, wherein its corners (32) are preferentially rounded. 8. The housing according to claim 7, wherein, starting at the annular section (28), the air guiding section (29), has an outlet surface (A2i) that changes toward the opposite end, wherein the outer diffuser (6) has a height (L), the inlet flow opening (7) has a diameter (D1), and the inner diffuser has an internal diameter (d1) in a region near the inlet flow opening (7), wherein the optimal change in surface (ΔAi) with respect to its inlet surface (A1i) is calculated with an expansion factor (k) with k=[(D1+2×L×tan⁢⁢α)2-(D12-d12)×(LD1-0.45×(LD1)2+1)-d12×L]and the formula ΔAi=A2i−=π×(d1+k+L)×(k×L)and the thus calculated outlet surface (A2i) of the air guiding section (29) differs by a maximum of 20% from the obtained optimal value, wherein (A1i) is the opening surface of the inner diffuser (26) at the beginning of its annular section (28), and (A2i) is the opening surface of the inner diffuser (26) at its end adjacent to the protective grid (36). 9. The housing according to claim 1, wherein the wall ring (2), the outer diffuser (6), and the struts (14) are fastened via the fastening elements (18, 19, 21, 22, 23). 10. The housing according to claim 9, wherein the wall ring (2) and the outer diffuser (6) have radially directed circumferential abutment surfaces (19, 21), which, in the installed state, abut one another and are connected to one another and to the struts (14) by the fastening elements (22), which run along the central longitudinal axis (X-X). 11. The housing according to claim 1, wherein the wall ring (2) with the inlet nozzle section (3) projects into the outer diffuser (6) through the inlet flow opening (7) in such a way that an axial gap (47) running along the central longitudinal axis (X-X) appears in an overlap region. 12. The housing according to claim 11, wherein the struts (14) connect the outer diffuser (6) and the wall ring (2) to the motor housing (17) through fastening elements that run radially with respect to the central longitudinal axis (X-X). 13. The housing according to claim 12, wherein the outer diffuser (6) has several fastening regions (18), that are widened in an outward direction and have an angle piece (19) at a free end, wherein the angle (β) of the angle piece (19) is β≥90°+α, with α=the cone angle of the outer diffuser (6) and β being the angle of the angle piece (19). 14. The housing according to claim 1, wherein the inner diffuser (26) is connected via a plug connection (50, 60) to the motor flange (16). 15. The housing according to claim 14, wherein the plug connection is formed from several latch connectors (50), which are fastened to a ring flange (14a) on the outer diffuser (6) to which the struts (14) are connected at the first strut end. 16. The housing according to claim 15, wherein the latch connectors (50) consists of a snap-in hook each. 17. The housing according to claim 16, wherein the snap-in hook has a fastening section (51) for fastening to the ring flange (14a) and a latch section (53) which connects thereto in the axial direction. 18. The housing according to claim 17, wherein the fastening section (51) is formed as an external thread section with a circumferentially arranged external thread (52). 19. The housing according to claim 17, wherein a contact section (54) is present between the fastening section (51) and the latch section (53). 20. The housing according to claim 15, wherein the latch section (53) consists of a shaft (55), to which at least two radial elastic latch arms (57) are formed, which are circumferentially spaced apart and extend along a longitudinal connector axis of each latch connector (50), the latch arms (57) extending from a tip (56) of the shaft (55) toward the fastening section (51) and together enclose an angle (□) of 36°±3° and have ends with angle sections (58) bent toward the longitudinal connector axis. 21. The housing according to claim 20, wherein the tip (56) has the shape of a truncated cone, wherein the smaller truncated cone surface lies at a free end of the tip (56). 22. The housing according to claim 20, wherein the inner diffuser (26) has fastening tabs (34) with holes (60), whose diameter is fitted to radial separations (A, B) of the spring arms in such a way that the latch arms (57) are radially pressed together by pushing the latch connector (50), and after completion of the plugging process, again spring back and in this position engage behind the fastening tabs (34) in the edge region of the holes (60), and the angle sections (58), with pre-tensioning, abut on an edge region formed by the holes (60). 23. The housing according to claim 22, wherein the angle sections (58) have an oblique position with respect to the longitudinal connector axis and cause a self-retention upon contact on the edge region of the holes (60). 24. The housing according to claim 14, wherein the latch connector (50) is formed as a molded plastic part.