Abstract
The invention relates to a housing (1) for a fluid machine, in particular for a radial fan (2), comprising at least one housing part (3), wherein the housing pail (3) has at least one inlet opening (7), wherein the housing part (3) can at least partially delimit a fluid chamber (8) for receiving at least one fan wheel (9), and wherein the inlet opening (7), at least in part, has a coned inlet surface (11) To produce a housing (1) for a fluid machine, in particular a housing (1) for a radial fan, preferably for use in a car seat and offering reduced noise emission together with good performance, the curved inlet surface (11) has at least in part the furan of a logarithmic spiral in cross-section, aridly at least one guide element (21) extends from the inlet surface (11) towards a central axis of the inlet opening (7), and/or on the inside (17) of the housing part (3) there is provided a circumferential recess (25) which at least partially circumferentially
Claims
1-15. (canceled)
16. A housing (1) for a radial fan (2), said housing comprising: at least one housing part (3), wherein the housing part (3) has at least one inlet opening (7), wherein a fluid chamber (8) for accommodating at least one fan wheel (9) can be at least partially delimited of the housing part (3), and an encircling set-back structure (25) which at least partially circumferentially surrounds the inlet opening (7) is formed on an inner side (17) of the housing part (3).
17. The housing (1) as claimed in claim 16, wherein the encircling set-back structure (25) has a basic cross section (27) in at least one first arc segment (26) along the circumference, and has a varying fill cross section (29) in at least one second arc segment (28), in particular in that the fill cross section (29) extends over an arc segment (28) with a center angle of between 1° and 359°.
18. The housing (1) as claimed in claim 17, wherein the encircling set-back structure (25) has a free basic area (30) in the basic cross section (27), and in that the free basic area (30) is reduced in the fill cross section (29).
19. The housing (1) as claimed in claim 17, wherein in a polar coordinate system which lies against the inner side (17) of the housing part (3) and the pole (P) of which coincides with a central axis (M) of the inlet opening (7) and the pole axis (PA1) of which is orthogonal with respect to the central axis (MA1) of an outlet opening (10), the fill cross section (29) extends in an angle range between 120° and 360° , in particular in an angle range between 135° and 355°.
20. The housing (1) as claimed in claim 17, wherein the fill cross section (29) has a continuous or discontinuous profile (33), in particular has a linear, arcuate and/or stepped profile (33).
21. The housing (1) as claimed claim 37, wherein the encircling projection (6) extends in at least one projection arc segment (34) along the circumference, in particular in that the projection arc segment (34) has a center angle between 1° and 359°, in particular 220°.
22. The housing (1) as claimed in claim 21, wherein in a polar coordinate system which lies against the inner side (17) of the housing part (3) and the pole (P) of which coincides with a central axis (M) of the inlet opening (7) and the pole axis (PA1) of which is orthogonal with respect to the central axis (MA1) of an outlet opening (10), the projection arc segment (34) extends in an angle range between 120° and 360°, in particular in an angle range between 135° and 355°.
23. The housing (1) as claimed claim 37, wherein the encircling projection (6) has a cross section which varies over its extent.
24. The housing (1) as claimed in claim 37, wherein the encircling projection (6) is at least partially inset into the housing part (3).
25. The housing (1) as claimed in claims 16, wherein the housing part (3) is formed from a plastic.
26. (canceled)
27. A radial fan (2), having at least one fan wheel (9), wherein the fan wheel (9) can be driven by a drive means, and wherein the fan wheel (9) is arranged rotatably in a fluid chamber (9) of a housing (1), the housing having at least one housing part (3), wherein the housing part (3) has at least one inlet opening (7), wherein a fluid chamber (8) for accommodating at least one fan wheel (9) can be at least partially delimited by the housing part (3), and an encircling set-back structure (25) which at least partially circumferentially surrounds the inlet opening (7), and/or an encircling projection (6) which at least partially surrounds the inlet opening, is formed on an inner side (17) of the housing part (3).
28. (canceled)
29. The radial fan (2) as claimed in claim 27, wherein the encircling set-back structure (25) has a basic cross section (27) in at least one first arc segment (26) along the circumference, and has a varying fill cross section (29) in at least one second arc segment (28), in particular in that the fill cross section (29) extends over an arc segment (28) with a center angle of between 1° and 359°.
30. The radial fan (2) as claimed in claim 29, wherein the encircling set-back structure (25) has a free basic area (30) in the basic cross section (27), and in that the free basic area (30) is reduced in the fill cross section (29).
31. The radial fan (2) as claimed in claim 30, wherein in a polar coordinate system which lies against the inner side (17) of the housing part (3) and the pole (P) of which coincides with a central axis (M) of the inlet opening (7) and the pole axis (PA1) of which is orthogonal with respect to the central axis (MA1) of an outlet opening (10), the fill cross section (29) extends in an angle range between 120° and 360°, in particular in an angle range between 135° and 355°.
32. The radial fan (2) as claimed in claim 27, wherein the fill cross section (29) has a continuous or discontinuous profile (33), in particular has a linear, arcuate and/or stepped profile (33).
33. A radial fan (2) as claimed claim 27, wherein the encircling projection (6) extends in at least one projection arc segment (34) along the circumference, in particular in that the projection arc segment (34) has a center angle between 1° and 359°, in particular 220°.
34. A radial fan (2) as claimed in claim 33, wherein a polar coordinate system which lies against the inner side (17) of the housing part (3) and the pole (P) of which coincides with a central axis (M) of the inlet opening (7) and the pole axis (PA1) of which is orthogonal with respect to the central axis (MA1) of an outlet opening (10), the projection arc segment (34) extends in an angle range between 120° and 360°, in particular in an angle range between 135° and 355°.
35. A radial fan (2) as claimed claim 27, wherein the encircling projection (6) has a cross section which varies over its extent.
36. A radial fan (2) as claimed in claim 27, wherein the encircling projection (6) is at least partially inset into the housing part (3).
37. A housing (1) for a radial fan (2), said housing comprising: at least one housing part (3), wherein the housing part (3) has at least one inlet opening (7), wherein a fluid chamber (8) for accommodating at least one fan wheel (9) can be at least partially delimited by the housing part (3), and an encircling projection (6) which at least partially surrounds the inlet opening, is formed on an inner side (17) of the housing part (3).
Description
[0052] In the drawing:
[0053] FIG. 1 shows a radial fan with an exemplary embodiment of a housing;
[0054] FIG. 2 shows a section through the exemplary embodiment as per FIG. 1;
[0055] FIG. 3 shows an exemplary embodiment of a housing part;
[0056] FIG. 4 shows a radial fan with an exemplary embodiment of a housing;
[0057] FIG. 5 shows an exemplary embodiment of a housing;
[0058] FIG. 6 shows a section through a further exemplary embodiment of a housing;
[0059] FIG. 7 shows an exemplary embodiment of a housing;
[0060] FIG. 8 shows the exemplary embodiment as per FIG. 7 in another view;
[0061] FIGS. 9a to g show exemplary embodiments of fill cross sections,
[0062] FIGS. 10a to h show exemplary embodiments of circumferential courses of the fill cross section,
[0063] FIG. 11 shows a radial fan with an exemplary embodiment of a housing,
[0064] FIG. 12 shows an exemplary embodiment of a housing part,
[0065] FIG. 13 shows the housing part as per FIG. 12,
[0066] FIGS. 14a to h show exemplary embodiments of cross sections of the encircling projection, and
[0067] FIGS. 15a to h show exemplary embodiments of circumferential courses of the encircling projection.
[0068] FIG. 1 shows an exemplary embodiment of a housing 1 for an illustrated radial fan 2. In this exemplary embodiment, the housing 1 comprises a first housing part 3 and a second housing part 4. The first housing part 3 and the second housing part 4 are connected to one another. The housing part 3 has an inlet opening 7 through which a fluid, for example air, can flow into a fluid chamber 8 in which a fan wheel 9 is rotatably held. The housing 1 furthermore has an outlet opening 10 through which the fluid exits the radial fan 2 again at a higher pressure. The inlet opening 7 has, at its circumference, a curved inlet face 11 which, in this exemplary embodiment, is convexly curved in the direction of the central axis M of the inlet opening 7.
[0069] FIG. 2 shows a section through the exemplary embodiment as per FIG. 1 in a plane which fully encompasses the central axis M of the inlet opening 7. The fan wheel 9 is held rotatably within the fluid chamber 8 between the first housing part 3 and the second housing part 4. The curved inlet face 11 which surrounds the inlet opening 7 over the full circumference is formed, in a portion between an end 12 of the inlet face 11 within the fluid chamber 8 and approximately the midpoint 13, of a height 14, of a domed elevation 15, as a Fibonacci spiral with three different radii of curvature. The inlet face 11 extends, in part, on the domed elevation 15.
[0070] The domed elevation 15 surrounds the inlet opening 7 along the entire circumference and protrudes from an outer side 16 of the housing part 3 in a direction parallel to the central axis M (see FIG. 1). The domed elevation 15 has, over its entire extent, a continuous course in cross section, in particular including the inlet face 11. On an inner side 17 of the housing part 3, the curved inlet face 11 likewise protrudes by way of its end 12.
[0071] FIG. 3 shows an exemplary embodiment of a housing part 3 in a perspective view. The housing part 3 is designed as a covering ring of a housing 1. The inlet opening 7 has a curved inlet face 11 which extends at least partially on a domed elevation 15. The domed elevation 15 projects out of the outer side 16 in a direction parallel to the central axis M. A multiplicity of guide projections 18 are arranged in the inlet face 11, wherein the guide projections 18 each extend substantially in a plane which comprises the central axis M of the inlet opening 7, that is to say which are not inclined relative to the central axis M. In particular, the noises generated by the radial fan 2 are further reduced by means of a recess 19 in the domed elevation 15 and/or in the inlet face 11. The recess 19 extends over a part of the circumference.
[0072] FIG. 4 shows a radial fan 2 with an exemplary embodiment of a housing 1 in a perspective view. In this exemplary embodiment, the housing part 3 has an inlet ring 20 which at least partially covers the inlet opening 7. The exemplary embodiment in FIG. 1 likewise shows an inlet ring 20. The inlet ring 20 is held on the housing part 3 by ten guide elements 21 in FIG. 4 and is held on the housing part 3 by three guide elements 21 in FIG. 1. The guide elements 21 have a first guide face 22a and a second guide face 22b with an at least two-dimensional extent. In FIG. 4, the guide faces 22a and 22b are inclined relative to the central axis M. In FIG. 1 and FIG. 4, the guide elements are uniformly distributed and spaced apart from one another on the circumference surrounding the inlet opening 7. The guide elements 21 are arranged on the inlet face 11 and extend in a radial direction in the direction of the inlet ring 20.
[0073] FIG. 5 shows an exemplary embodiment of a housing 1 from the outer side 16. The housing 1 has an inlet ring 20 which is held on the housing part 3, so as to partially cover the inlet opening 7, by seven guide elements 21. A proportion of the guide elements 21 are spaced apart from one another on the circumference of the inlet opening 7 or of the inlet face 11 such that the spacings A1 to A5—the center angles—relate to one another in accordance with the Fibonacci sequence. This means that, proceeding from a first spacing A1, which is based on a center angle of 13°—as the seventh element of the Fibonacci sequence—, and a spacing A2, which is based on a center angle of 21°—as the sum of 8° and 13°—, the following spacings correspond in each case to the sum of the two preceding spacings or center angles. Consequently, the center angle of the spacing A3 is the sum of the center angles of A1 and A2, and the center angle of A4 is the sum of the center angles of A2 and A3, and the center angle of A5 is the sum of the center angles of A3 and A4. By means of the illustrated non-uniform distribution of the guide elements 21 on the circumference, the pressure can be increased while maintaining the same noise generation, in particular in the case of volume flows between two and four liters per second.
[0074] In FIG. 5, in a polar coordinate system which lies against the outer side 16 of the housing part 3 and the pole P of which coincides with the central axis M of the inlet opening 7 and the pole axis PA of which is orthogonal with respect to the central axis MA of the outlet opening 10, the first guide element 21 is arranged with the spacing Al to the second guide element 21 approximately at an angle of 90°.
[0075] In the exemplary embodiment of FIG. 1 and FIG. 2, the inlet ring 20 has a surface 23 which is oriented in the direction of the inlet face 11 and which, in the cross section illustrated in FIG. 2, has, in part, in particular specifically between an end 20a and a portion end 23a prior to the change in the sign of the curvature of the face in the cross section, the form of a Fibonacci spiral. Furthermore, in the cross section, a surface 24, which is averted from the inlet face 11, of the inlet ring 20 also has, in part, in particular specifically between the end 20a and a portion end 24a at the transition into the end face of the inlet ring, the form of a Fibonacci spiral, in particular with at least two different radii. By means of such a design of the inlet ring 20, it is possible for the pressure of the radial fan 2 to be increased while maintaining the same noise generation in the case of virtually all volume flows.
[0076] FIG. 6 shows an exemplary embodiment of a housing 1 for an illustrated radial fan 2. The fan wheel 9 is held rotatably within the fluid chamber 8 between the first housing part 3 and a second housing part 4. At the inner side 17 of the housing part 3, on the opposite side of the domed elevation 15, there is formed an encircling set-back structure 25 which surrounds the inlet opening 7 over the full circumference. The encircling set-back structure 25 is, in the section illustrated, designed such that the wall thickness is approximately constant in the region of the inlet face 11 and of the domed elevation 15. By means of the encircling set-back structure 25, it is possible, while maintaining the same noise generation, in particular in the case of volume flows of greater than two liters per second, for the pressure to be increased in relation to exemplary embodiments without an encircling set-back structure 25. In this exemplary embodiment, an inner flank 31 of the encircling set-back structure 25 is formed parallel to the central axis M of the inlet opening 7.
[0077] FIG. 7 and FIG. 8 show an exemplary embodiment of a housing part 3 from the inner side 17. FIG. 8 shows the exemplary embodiment in a perspective view. The encircling set-back structure 25 extends over the entire circumference of the inlet opening 7. In a first arc segment 26 along the circumference, the encircling set-back structure 25 has a basic cross section 27, which is illustrated for example in FIG. 6. In a second arc segment 28, the encircling set-back structure 25 has a fill cross section 29, the cross section of which deviates from the basic cross section 27 and varies. In the illustrated exemplary embodiment, the fill cross section 29 extends over a second arc segment 28 with a center angle of approximately 220°. In a polar coordinate system which is directed onto the inner side 17 of the housing part 3 and the pole P of which coincides with the central axis M of the inlet opening 7 and the pole axis PA1 of which is orthogonal with respect to a central axis MA1 of the outlet opening 10 of the housing 1, the illustrated fill cross section 29 is—with its total center angle of 220°—arranged in an angle range between 138° and 358°. In FIG. 8a, the fill cross section 29 is illustrated by dashed lines merely for illustrative purposes; it is not a section.
[0078] FIG. 9a to FIG. 9g show exemplary embodiments of the basic cross section 27 and of the fill cross section 29 of the encircling set-back structure 25. The cross section reduced in relation to the basic cross section 27 is illustrated by hatching in FIG. 9b to FIG. 9g merely for the purposes of a simplified illustration; it is not a different material. FIG. 9a shows the encircling set-back structure 25 with a basic cross section 27 which, in the cross section, has a free basic area 30 with a basic height GH, which is measured at the inner flank 31 between an imaginary plane at the inner side 17 and that point 30 in the basic cross section 27 which is furthest remote from said plane along the central axis M or the inner flank 31.
[0079] FIG. 9b to FIG. 9g show exemplary embodiments of the fill cross section 29 with different profiles 33 in the base region over the width of the encircling set-back structure 25. In the cross section, the profiles 33 have, in particular in a radial direction proceeding from the central axis M, either a continuous, arcuate course (FIGS. 9c and 9e), a linear course (FIGS. 9b, 9d and 9f) or a stepped course (FIG. 9g). FIG. 9b to FIG. 9g show in each case a section in the region of the maximum reduction of the free basic area 30. Proceeding from the illustrated maximum reduction of the of the free basic area 30, this increases again in both circumferential directions in that, with a constant profile 33, a continuous increase of the free basic area 30 is realized—the hatched area decreases proceeding from the illustrated maximum area.
[0080] FIG. 10a to FIG. 10h show exemplary embodiments of the course of the fill cross section 29 in percent—on the ordinate axis. The value of 100% is illustrated in all exemplary embodiments of FIGS. 9b to 9g; the course illustrated in FIG. 10a to FIG. 10h is realized over the circumference proceeding from said maximum value. The circumference is illustrated on the basis of the angle in a coordinate system as per FIG. 7 on the abscissa axis. The exemplary embodiments of FIGS. 10d, 10e and 10f show exemplary embodiments with at least two second arc segments 28 with a varying fill cross section 29, which, at least locally on the circumference, has one of the profiles of FIG. 9b to FIG. 9g, specifically at the illustrated maxima. The exemplary embodiments of FIGS. 10a, 10b, 10c, 10g and 10h show exemplary embodiments in which the second arc segment 28 extends with the fill cross section 29 approximately fully over the entire circumference.
[0081] FIG. 11 shows an exemplary embodiment of a housing 1 for an illustrated radial fan 2. As in the exemplary embodiment as per FIG. 1, over the entire circumference of the inlet opening 7, the inlet face 11 has, in cross section, a form which corresponds to the form of the Fibonacci spiral, in particular with three different radii. The inlet face 11 extends at least partially on a domed elevation 15 which surrounds the inlet opening 7. On the outer side 17 of the housing part 3, the domed elevation 15 is surrounded by a honeycomb-like supporting structure 5, the height of which corresponds to the height 14—see FIG. 2—of the domed elevation 15. The supporting structure 5 is formed in one piece with the housing part 3 and serves in particular for stabilizing the housing part 3. In this exemplary embodiment, the supporting structure extends over the entire face of the outer side 16.
[0082] FIG. 12 and FIG. 13 show an exemplary embodiment of a housing part 3 from the inner side 17. The inlet opening 7 is, along its circumference, partially surrounded by an encircling projection 6, which extends over a projection arc segment 34 which covers a center angle of approximately 250°—see FIG. 12. In a coordinate system as per FIG. 7, the projection arc segment 34 is arranged approximately in an angle range between 135° and 25°. The encircling projection 6 is illustrated with hatching merely for illustrative purposes. In this exemplary embodiment, the encircling projection 6 is formed in one piece with the housing part 3. The encircling projection 6 is, in the assembled state, arranged substantially in the pressure region of a radial fan 2, whereby the performance characteristics are advantageously influenced.
[0083] FIGS. 14a to 14g show exemplary embodiments of encircling projections 6 in cross section, specifically at a point with the maximum area of the encircling projection in the cross section. Proceeding from the areas illustrated in FIG. 14a to FIG. 14h, the area of the encircling projection 6 in the cross section decreases continuously or has a course which is illustrated in FIGS. 15a to 15h. Here, the sections illustrated in FIG. 14a to FIG. 14h are at the absolute maximum of FIG. 15a to FIG. 15h. The stated angles in FIG. 15a to FIG. 15h relate to a coordinate system as per FIG. 7.
[0084] In the exemplary embodiments of FIG. 14a to FIG. 14h, the encircling projection 6 is formed as a separate part and is inserted and fastened into a recess 35 in the housing part 3. The illustrated encircling projections 6 have a polygonal and/or at least partially curved cross section. A maximum height 36, illustrated by way of example in FIGS. 14a and 14g, of the encircling projection 6 is preferably selected such that a gap between a fan wheel 9 and the maximum height 36 amounts to between 1 mm and 5 mm.
