A flow rectifier (1) for an axial fan (2), having a base body (3) which has rings (4a, 4b, 4c, 4d, 4e) delimited radially inside the outside by cylindrical surfaces (5, 6). Air guide vanes (7) which are distributed in the circumferential direction about a longitudinal axis (X-X) arranged in a genera
A flow rectifier (1) for an axial fan (2), having a base body (3) which has rings (4a, 4b, 4c, 4d, 4e) delimited radially inside the outside by cylindrical surfaces (5, 6). Air guide vanes (7) which are distributed in the circumferential direction about a longitudinal axis (X-X) arranged in a generally radial manner and extend between the cylindrical surfaces (5, 6). The air guide vanes (7), in the circumferential direction, extend with a curvature (R1) relative to the axial direction (X-X) between an inflow-side vane edge (7a) and an outflow-side vane edge (7b). In order to minimize the divergence of airflow from the flow rectifier (1), two or more rings (4a, 4b, 4c, 4d, 4e) having air guide vanes (7) are provided in the base body (3).
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1. A flow rectifier for an axial fan, having a base body, comprising two or more rings arranged in a radial sequence, each delimited radially by cylindrical inside and outside curved surface areas, a plurality of air guide blades, which are distributed in a circumferential direction about a longitud
1. A flow rectifier for an axial fan, having a base body, comprising two or more rings arranged in a radial sequence, each delimited radially by cylindrical inside and outside curved surface areas, a plurality of air guide blades, which are distributed in a circumferential direction about a longitudinal axis, and which are disposed in a generally radial manner such that they extend between the curved surface areas, wherein, when viewed in a circumferential direction, the plurality of air guide blades extend with a first curvature relative to an axial direction, each air guide blade extending between an inflow-side blade edge and an outflow-side blade edge, and wherein the plurality of air guide blades have an axial height that varies in a radial direction such that the outflow-side blade edges of each air guide blade follow a radial path that defines defining a second curvature that is a circular arc-shaped curvature, wherein the second curvature has a first end portion extending generally parallel to the axial direction and a second end portion extending generally parallel to the radial direction. 2. A flow rectifier according to claim 1, wherein the varying axial height in the radial direction of each outflow-side blade edge has a constantly changing height. 3. A flow rectifier according to claim 1, wherein the first curvature relative to the axial direction, of each of the plurality of air guide blades, when viewed in a circumferential direction, between the inflow-side blade edge thereof and the outflow-side blade edge, an inflow angle (μz) of air to each of the plurality of air guide blades is selected such that the inflow angle corresponds to an outflow angle (μA) of the air out of the axial fan, on which the base body is mounted, and in that the outflow angle (μA) of the air from each of the plurality of air guide blades is selected such that, each air guide blade is configured to extend parallel to an air flow direction, which extends in a direction of the longitudinal axis. 4. A flow rectifier according to claim 3, wherein the respective inflow angle (μz) of the air is identical at all air guide blades. 5. A flow rectifier according to claim 3, wherein the respective inflow angle (μz) of the air is identical at all of the air guide blades that are located in a first of the two or more rings and wherein the inflow angle is the same as or differs from the respective inflow angle (μz) of the air at all of the air guide blades in a second of the two or more rings. 6. A flow rectifier according to claim 5, wherein the respective inflow angle (μz) of the air at the plurality of air guide blades varies from the first ring to the second ring as a function of an outflow profile of the air leaving the axial fan. 7. A flow rectifier according to claim 1, wherein the base body is designed as a one-part, molded component made from plastic. 8. A flow rectifier according to claim 1, wherein fastener elements are provided on the base body for releasable attachment to the axial fan. 9. A flow rectifier according to claim 1, wherein the number of air guide blades disposed within a ring of the two or more rings decrease from one of the two or more rings to another of the two or more rings moving radially inward, so that substantially uniform circumferential spacing between respective air guide blades exists in each of the two or more rings. 10. A flow rectifier according to claim 1, wherein in the radial sequence of the two or more rings with the plurality of air guide blades, the rings each have different heights, which each alternate from each of the two or more rings. 11. A flow rectifier according to claim 10, wherein the radial path of the second curvature of each of the plurality of blade edges, using the axial height, which varies in the radial direction, is configured such that the second curvatures of each of the plurality of blade edges in adjacently located rings are a mirror image of one another. 12. A flow rectifier according to claim 1, wherein in the radial sequence of the two or more rings, the inflow-side blade edges and the outflow-side blade edges of the plurality of air guide blades in adjacently located rings are disposed having a circumferential offset relative to one another. 13. A flow rectifier according to claim 8, further comprising the fastener elements in the form of a catch means for connection to a wall ring associated with the axial fan through mounting openings, through which screws serving as a screw connection to the axial fan may pass. 14. A flow rectifier according to claim 8, wherein the two or more rings comprise a first ring, a second ring, and a third ring with the plurality of air guide blades extending between the first ring and the second ring, and between the second ring and the third ring. 15. A flow rectifier according to claim 8, wherein the two or more rings comprise a first ring, a second ring, a third ring, and a fourth ring with the plurality of air guide blades extending between the first ring and the second ring, between the second ring and the third ring, and between the third ring and the fourth ring. 16. A flow rectifier according to claim 8, wherein the two or more rings comprise a first ring, a second ring, a third ring, a fourth ring and a fifth ring, with the plurality of air guide blades extending between the first ring and the second ring, between the second ring and the third ring, between the third ring and the fourth ring, and between the fourth and the fifth ring.
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