• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:NL1038334A
    申请号:NL1038334
    申请日:2010-10-26
    公开日:2011-04-27
    发明作者:Tobias Metz；Roland Keber
    申请人:Ebm Papst Landshut Gmbh；
    IPC主号:
    专利说明:

    Radial fan.
    Description
    The invention relates to a radial fan with a housing and fan fan arranged therein, around which a pressure chamber widening substantially in the direction of flow is formed, wherein a tongue is provided in the housing, which tongue extends substantially with its free end in the circumferential direction, and a diffuser is provided on the housing, which comprises multiple flow segments, wherein at least a first flow segment extends within the housing and wherein the cross sections of the flow segments increase towards the air outlet at least per segment.
    The fan configuration of the present invention is often used as a premixing fan in heating technology, with gas and air being premixed in the usual way into a flammable mixture. The use of such a radial fan in heating technology requires a fan with an extremely small construction space, which can be operated with high efficiency with low noise production. With such radial fans, the fan impeller generates a rotating flow from the center of rotation to the outside. In order to use the energy entrained in the flow as efficiently as possible, in particular the pulse energy present as rotation is converted into pressure energy. To that end, the rotation of the flow is deflected by means of a guide unit and the mass flow is collected. By increasing the flow cross-section, at least a part of the pulse energy can be converted back to static pressure. For this purpose, for example, a diffuser may be provided as a guiding device, which is advantageous and can be used over a wide range with smaller fans. This widening of the flow cross-section is realized by applying a spiral housing, the outer part of which extends around the central fan impeller zone with its cross-section, so that the flow and the fan impeller can be absorbed and can be discharged tangentially at the end. In the area of the spiral housing where the wide end meets at the beginning of the spiral, a tongue "reduces" the flow. Such a tongue is disclosed, for example, in the European patent application with application number 04 400 016.4. Partly for acoustic reasons, the tongue is not simply formed parallel to the axis of rotation, but runs out of the spiral into a sharp angle. Furthermore, the structure of the tongue also significantly influences the noise production of the fan.
    In the case of radial fans according to the prior art, it is disadvantageous that the diffuser usually is arranged at the end of the spiral shape of the housing, in order to ensure a maximum recovery of pressure. However, this is accompanied by an enlarged construction space of the radial fan.
    In such an embodiment of the spiral housing with subsequent diffuser, the tongue nowadays forms the transition to the diffuser. In this case, however, the initial cross-section of the diffuser is difficult to determine. As a result of this indeterminacy, the diffursor is usually dimensioned too small or too large, so that non-maximum possible amount of pressure is recovered, or the flow in the diffuser tears off. If the tongue is not designed as an additional part, as described above, but is formed as a simple step, the danger of releasing the flow exists in particular in the area which follows the tongue in the direction of flow.
    It is known from the literature that the diffusers arranged in the area of the air outlet are not provided with an opening angle greater than 10 ° in any direction, in order to prevent the flow from releasing. This also determines the maximum pressure gain in a diffuser for a given end cross-section of the coil. If the dimensions of a diffuser are limited in some directions by constructional or production-technical reasons, then optimum design of the diffuser is not possible.
    In the present invention of a radial fan having the features of claim 1, a diffuser is formed such that flow release does not occur even when the individual aperture angles are greater than 10 °. This is achieved in particular as a result of the fact that the diffuser is not downstream of the spiral-shaped housing, but is already at least partly formed in the interior of the spiral housing, so that a substantially loss-free flow as well as a small construction volume are obtained. The diffuser is thereby provided with multiple flow segments, preferably three, with the first flow segment still within the housing, the second flow segment located in the free end of the tongue following the flow direction and the third flow segment located in the area for the air or mixture outlet respectively , extends.
    In addition to the spiral widening, the fan housing is substantially round, so that different angles of the outer circumference of the housing can be determined starting from the axis of the fan fan. The angle α is the angle over which the tongue extends in the circumferential direction of the fan housing. The angle is given as β, over which the tongue and a first flow segment of the diffuser extend in the circumferential direction of the housing. The angle δ is the extension of the first flow segment over the outer circumference of the housing, where: δ = β - α. In a preferred embodiment, a first flow segment of the diffuser extends over an angle δ of the outer circumference of the housing from at most 50 ° within the housing. The spiral housing encloses the fan impeller without the first flow segment of the diffuser and without the tongue at a maximum of 310 °, that is, the angle δ must be greater than 50 °. It is also advantageous if the extension of the tongue in the circumferential direction about the fan impeller is between α = 15 and 40 °. If the geometric dimensions of these areas are not adhered to, there is a risk of releasing the flow, low returns and increased noise.
    In order to obtain a high efficiency with a low overall height, it is envisaged that the first flow segment of the diffuser extends from the interior of the housing to a plane that is clamped by the normal of the free end of the tongue perpendicular to the housing outer wall. The second flow segment of the diffuser connects to the first flow segment in the flow direction and preferably extends over a length between one and two thirds of the total length, measured from the end of the first flow segment to the air outlet. In this area, it is possible to widen the flow cross-section from the first flow segment to the second flow segment so that neither the release of the flow nor excessive noise production is obtained.
    In the present invention, from the free end of the tongue to the air outlet, the diffuser can, by determining the overall geometry, include an opening angle of more than 10 ° without releasing the flow mentioned in the literature. According to an embodiment of the invention, this is achieved in that a first auxiliary angle, between the cross-sectional area formed at the end of the first flow segment and the cross-sectional area formed at the end of the second flow segment, is less than 10 °. A second auxiliary angle, between the sectional plane formed at the end of the second flow segment and the sectional plane formed at the air outlet, is preferably less than 7 °. The auxiliary angle is formed by the fan according to the invention by the following formula: where A1 is the sectional plane at the end of the first flow segment, A2 is the sectional plane at the end of the second flow segment, D is the hydraulic diameter at the end of the first flow segment and d the length is of the second flow segment:
    As long as the determination of the geometry based on the above-mentioned auxiliary angle in the corresponding flow segments is taken into account, it is possible to realize a total opening angle greater than 10 ° within the diffuser, without releasing the flow, and the pressure recovery always being sufficiently large is. In a preferred embodiment, the diffuser in the area of the third flow segment, which follows the second flow segment in the flow direction, can be designed as a bend piece in order to minimize the required building space. Normally, the material and space consumption for an additional bend piece is very high, since in addition to the fan housing and the diffuser, an additional component is set up, which must be designed even with large jets, in order to exclude the release of the flow. It is also difficult to match the extra parts precisely to each other in order to minimize the disadvantages mentioned. With the present invention it is possible to integrate the bend in the diffuser, the bend preferably being designed such that the normal of the cross-section at the end of the second flow segment tends to have an angle of at least 15 ° with the air outlet normally connected to the cross-section, maximum 80 °, however. Any angle is possible between them. The cross-section of the diffuser or bend in the area at the air outlet is provided essentially with a ratio of the sides of 4: 3, the housing wall extending from the tongue to the air outlet terminating in an arc-shaped direction towards the center of the cross-sectional area of the air outlet . The flow can thereby be carried along in the area following the tongue, without releasing, up to the air outlet on the bend piece.
    In an advantageous embodiment, the housing can be formed from a bottom part and a cover, the cover in the third flow segment (bend piece) comprising an inclination extending in the direction of the bottom part. By "slope" is meant any embodiment which extends from the cover in the direction of the bottom part such that the cross-section is reduced. The slope can extend over the total width or can only be provided in segments. In any case, it is advantageous if the end of the ramp ends up flush with the bottom part of the housing in the area of the air outlet.
    In addition to the widening of the diffuser, starting from the free end of the tongue to the largest width, it can further be provided that the height of the diffuser in the second flow segment increases substantially uniformly and decreases substantially regularly in the region of the third flow segment. The height reduction can in one embodiment be made possible by providing a slope. The axial direction of the fan impeller is defined as the height direction. Reducing the cross-section in the last segment results in an acceleration of flow and therefore an optimized inflow into the bend.
    With the given geometrical dimensions, a diffuser can be provided on a radial fan, which is constructed in such a way that release of the flow does not occur, even when the individual areas of the diffuser or the bend have an opening angle greater than 10 °. Due to the special design of the auxiliary angle in the various flow segments and the inclusion of the diffuser action in the interior of the spiral housing as well as the design of the third flow segment as a bend, a small construction volume with a maximum efficiency and an extremely low noise production is obtained.
    Further features, advantages and embodiments of the invention form the subject of the following description and the schematic drawing of the exemplary embodiments.
    FIG. 1 shows a top view of a radial fan with integrated diffuser, FIG. 2 is a sectional side view of the radial fan of FIG.
    FIG. 1 shows a radial fan 1 with a housing 2 and a fan impeller 3 provided therein. The housing comprises a substantially spiral-shaped shape, a pressure chamber 4 which is regularly widened in the circumferential direction is formed on the outside and merges at its end into a diffuser mounted 6 housing.
    The diffuser 6 comprises three flow segments X, Y, Z, the first flow segment X being formed internally in the housing 2 and the third flow segment Z as a bend piece 8. The flow cross sections of the diffuser 6 widen at least per segment in all sections X, Y, Z, with a substantially regular widening provided in the first and second flow segments X, Y. Provided in the region of the end of the spiral of the housing 2 is a tongue 5 arranged in the circumferential direction, the free end 5 'of which forms the beginning of the spiral shape and which serves to' dismantle 'and follow up the flow. The tongue is shaped in such a way that it runs up sharp edges over several parts. In the circumferential direction the tongue 5 extends over the angle α, in the present example about 30 °, measured from the free end 5 'of the tongue to an extended line up to the end of the second flow segment Y of the diffuser. The first flow segment X of the diffuser 6 formed in the interior of the housing encloses the circumference of the housing with the angle β, which according to Fig. 2 takes up approximately 70 °. In any case, the angle β must nevertheless be made greater than 50 ° in order to be able to guarantee the advantages of the present invention. The first flow segment X of the diffuser is formed outside of the fan impeller 3 and extends in the interior of the housing to an angle δ of the free end of the tongue 5 'with respect to the housing outer wall, where: δ = β - α in this case. 40 °.
    From the free end of the tongue 5 'up to the largest width, the diffuser 6 opens by about 10 °, the auxiliary angle of the sectional surfaces A1, A2, C arranged at the end of the flow segments meeting the standard that the auxiliary angle of A1 to A2 less than 10 ° and from A2 to C less than 7 °. The help angle is then according to the formula
    where D is the hydraulic diameter at the flow inlet at the sectional plane A1 and d is the distance between the sectional planes A1 and A2. d can in any case be selected such that the third flow segment Z extends to the second flow segment Y with a length of one to two thirds of the total length from the sectional plane A1 to the outlet plane C.
    The tongue 5 extends tangentially from the free end 5 'with respect to the housing wall in the direction of the main axis of the diffuser 6 and is contiguous to the third flow segment Z in a shape substantially parallel to the outer wall (seen in top view) ) about. The diffuser is manufactured in such a way that the end cross-section no longer changes with a certain size, starting from a start cross-section, in order to prevent the flow from being released. The third flow segment Z formed as a bend 8 at the air outlet then comprises a substantially rectangular shape, with a ratio of the sides of 4: 3, wherein the housing wall extending from the tongue 5 to the air outlet 7 ends in an arc-shaped direction towards the center of the cross-sectional plane C, the air outlet 7. Along the tongue 5 and the following second and third flow segments Y, Z can therefore be guaranteed over the entire length of the diffuser 6 without releasing and at the same time with a high degree of pressure recovery.
    Fig. 2 shows a cross-sectional view of the radial fan of Fig. 1. The housing 2 comprises a bottom part 2 'and a cover 2 "which are attached to each other. The fan impeller 3 arranged in the interior of the housing 2 extends in radial direction into the first and second flow segment X, Y of the diffuser 6. The diffuser 6 regularly expands in the height direction h and in the first and second flow segment X, Y, wherein in the third flow segment Z the height is reduced in segments by a slope 9 on the cover 2 'arranged in the area of the air outlet. ends immediately in the housing bottom part 2 'in the area of the air outlet and guarantees a permanent abutment in height direction of the flow over the entire length of the diffuser The third flow segment Z, designed as bend piece 8, deflects the flow at an angle τ of about 60 ° which is formed by the normal of the section A2 relative to the section C. Other deflections of 90 ° and more are also possible.
    The invention is not limited in the embodiment to the exemplary embodiment shown above. Rather, a number of variants are conceivable which also make use of the disclosed solution in embodiments which are designed differently in principle and which also lie within the scope of the invention. For example, it is possible to design the housing in one piece or to have the flow guide inside the diffuser not take place on this outer wall, but on additionally introduced means for changing the cross-section.
    权利要求:
    Claims (15)
    [1]
    Radial fan (1) with a housing (2) and a fan impeller (3) arranged therein, around which a pressure chamber (4) widening substantially in the direction of flow is formed, wherein a tongue (5) is formed in the housing (2) provided with its free end (5 ') extending substantially in the circumferential direction, and a diffuser (6) is provided on the housing (2), which comprises multiple flow segments (X, Y, Z), at least one first flow segment (X ) extends inside the housing (2) and the cross sections of the flow segments (X, Y, Z) widen towards the air outlet (7) at least per segment.
    [2]
    Radial fan according to claim 1, characterized in that at least one first flow segment (X) of the diffuser (6) extends through an angle (δ) of the outer circumference of the housing of at most 50 ° within the housing.
    [3]
    Radial fan according to one of the preceding claims, characterized in that the first flow segment (X) extends to a plane that is clamped by the normal of the free end (5 ') of the tongue (5) perpendicular to the outer wall of the housing.
    [4]
    Radial fan according to one of the preceding claims, characterized in that the second flow segment (A2) connects to the first flow segment (A) in the flow direction and extends over a length between one and two thirds of the total length, measured from the end from the first flow segment (X) to the air outlet (7).
    [5]
    Radial fan according to one of the preceding claims, characterized in that the diffuser (6) opens from the free end (5 ') of the tongue (5) to the air outlet (7) with at least 10 °.
    [6]
    Radial fan according to one of the preceding claims, characterized in that a first auxiliary angle (μ) formed between the sectional plane (A) at the end of the first flow segment (X) and the sectional plane (A2) formed at the end of the second flow segment (Y), is less than ΙΟ®.
    [7]
    Radial fan according to one of the preceding claims, characterized in that a second auxiliary angle (μ '), smaller between the sectional plane (A2) formed at the end of the second flow segment and the sectional plane (C) formed at the air outlet (7), is smaller is then 7 °.
    [8]
    Radial fan according to one of the preceding claims, characterized in that the tongue (5) extends over at least 15 ° to at most 40 ° of the outer circumference of the fan impeller (3).
    [9]
    Radial fan according to one of the preceding claims, characterized in that the diffuser (6) in the area of the third flow segment (Z) is designed as a bend piece (8).
    [10]
    Radial fan according to the preceding claim, characterized in that the bend (8) is shaped such that the normal of the cross-section (B) and the normal of the cross-section (C) are at an angle of at least 15 °.
    [11]
    A radial fan according to any one of the preceding claims, characterized in that the cross-section (C) at the air outlet (7) is substantially rectangular and is formed with a ratio of the sides of 4: 3, the distance from the tongue (5) housing wall extending up to the air outlet (7) ends arcuately towards the center of the cross-sectional plane (C) of the air outlet (7).
    [12]
    Radial fan according to one of the preceding claims, characterized in that the housing (2) is formed from a bottom part (2 ') and a cover (2 "), with the cover (2") in the third flow segment (Z) slope (9) extending in the direction of the bottom part (2 ').
    [13]
    Radial fan according to one of the preceding claims, characterized in that the height (h) of the diffuser (6) in the second flow segment (Y) increases substantially regularly.
    [14]
    Radial fan according to one of the preceding two claims, characterized in that the height (h) of the diffuser (6) in the third flow segment (Z) decreases substantially regularly and the slope (9) ends substantially flush with the bottom part ( 2 ') of the housing in the area of the air outlet (7).
    [15]
    Radial fan according to one of the preceding claims, characterized in that the auxiliary angle is in each case formed by the formula

    Λ T O Ύ X L
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    法律状态:
    2019-06-05| MM| Lapsed because of non-payment of the annual fee|Effective date: 20181101 |
    优先权:
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    DE102009050684|2009-10-26|
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