CN210033892U

CN210033892U - Diagonal fan

Info

Publication number: CN210033892U
Application number: CN201920105065.0U
Authority: CN
Inventors: T·海利; 尤金·克莱因汉斯; 安·卡特琳·洛贝尔
Original assignee: Ebm Papst Mulfingen GmbH and Co KG
Current assignee: Ebm Papst Mulfingen GmbH and Co KG
Priority date: 2018-11-16
Filing date: 2019-01-22
Publication date: 2020-02-07
Anticipated expiration: 2029-01-22
Also published as: WO2020099035A1; DE102018128811A1

Abstract

The present invention relates to a diagonal fan, comprising an electric motor, a housing and a diagonal impeller, which is accommodated in the housing and drivable by the motor, the diagonal flow of the diagonal impeller, which is generated in operation, being deflected by the inner wall of the housing in the axial flow direction, wherein the housing is constructed at its air inlet to securely accommodate an inlet nozzle, and wherein the housing has at least two axial fastening planes for fastening a heat exchanger to the housing in two different axial positions, wherein a first fastening plane is formed by a flange on the outer peripheral face of the housing and a second fastening plane is formed by a fixing device for the inlet nozzle at the air inlet. The utility model provides a can replace axial fan with diagonal angle fan when using with heat exchanger and do not increase the problem of entire system's axial installation length.

Description

Diagonal fan

Technical Field

The utility model relates to a diagonal fan that can variably make up with different nozzles.

Background

Diagonal fans and their use are generally known in the art, for example from DE 102014210373 a 1.

Diagonal fans are used in applications where air performance requirements are high, such as cooling technology or range hoods, where back pressure is high and installation space is small. Due to the large motor diameter of the motor, which is arranged axially with respect to the installation space, the discharge surface at the discharge opening is relatively small, resulting in high outflow losses during flow due to the high dynamic pressure at the diagonal fan outlet.

Axial fans are commonly used to achieve high air supply distances, but they require a considerable amount of axial installation space. Diagonal fans are suitable for compact installations. Furthermore, they have a wider field of application at higher back pressures and at the same time higher efficiencies.

SUMMERY OF THE UTILITY MODEL

The utility model provides a can replace axial fan with diagonal angle fan when using with heat exchanger and do not increase the problem of entire system's axial installation length.

A diagonal fan, wherein the diagonal fan comprises an electric motor, a housing and a diagonal impeller which is accommodated in the housing and drivable by the motor, the diagonal flow of the diagonal impeller generated in operation being deflected by an inner wall of the housing in the axial flow direction, wherein the housing is configured at its air inlet for securely accommodating an inlet nozzle, and wherein the housing has at least two axial fastening planes for fastening a heat exchanger to the housing in two different axial positions, wherein a first fastening plane is formed by a flange on an outer peripheral face of the housing and a second fastening plane is formed by a fixing means for the inlet nozzle at the air inlet.

Preferably, the flange is located at a distance M from the air inlet and is positioned at the housing at a distance N relative to the axial air outlet of the diagonal fan, wherein the ratio M/N is fixed, i.e. 0.70. ltoreq. M/N.ltoreq.1.3 applies.

Preferably, the inlet nozzle is detachably fastenable as a separate component on the housing.

Preferably, the fixing means of the inlet nozzle are configured to accommodate both the inlet nozzle and, alternatively, the heat exchanger.

Preferably, the housing has a truncated portion at the air inlet, the edge of which is dimensioned close to the housing diameter at the air outlet, so that a space-saving installation is achieved when the diagonal fan is immersed in a heat exchanger having a rectangular cross-section.

Preferably, viewed in the axial flow direction, next to the diagonal impeller, a redirecting device is arranged, which has a plurality of guide blades distributed in the circumferential direction, which guide blades balance the gas flow generated by the diagonal impeller.

Preferably, the redirecting device has a protective grid that extends across the output section of the diagonal fan and has an axial length that is less than the total axial length of the redirecting device.

Preferably, the redirecting device, the housing and the protective grid are constructed in one piece.

Preferably, the protective grid has a plurality of annular webs arranged coaxially with one another, which in each case form opposing web surfaces extending parallel to the axial flow direction.

Preferably, the annular web in the region of the stator blade is configured to project axially with respect to the flow edge of the respective stator blade.

Preferably, the guide blades of the redirecting device, viewed in the axial cross section, are curved and/or contoured in a plane.

Preferably, the maximum diameter G of the hub region of the redirecting means is greater than the maximum diameter F of the hub of the diagonal impeller, so that the hub region of the redirecting means, viewed in axial projection, covers the hub of the diagonal impeller.

Preferably, the redirecting device in the hub region has a motor mount for the electric motor.

Preferably, the diagonal impeller has a collar which surrounds the impeller blades distributed in the circumferential direction and sets the outflow angle of the impeller blades.

Preferably, the inlet nozzle is arranged on the suction side on the housing and extends in the axial direction into the retaining ring.

According to the present invention, a diagonal fan is provided having an electric motor, a housing and a diagonal impeller contained within the housing and drivable by the electric motor. The diagonal flow generated by the diagonal impeller in operation is deflected in the axial flow direction by the inner wall of the housing. The housing is formed at an air inlet thereof to securely receive the inlet nozzle. Furthermore, the housing has at least two axial fastening planes for fastening the heat exchanger to the housing at two different axial positions, wherein a first fastening plane is formed by a flange on the outer circumferential face of the housing and a second fastening plane is formed by a fixing device for the inlet nozzle at the air inlet.

By means of the solution according to the invention, the heat exchanger can be fixed on a flange outside the housing, so that part of the diagonal fan is arranged inside the heat exchanger and therefore the axial installation length is very small. In this case, a separate inlet nozzle is alternatively fastened at the air inlet. Alternatively, the heat exchanger itself may form a nozzle that is directed into the diagonal fan at the air inlet and affects the intake air flow. For this purpose, the same fixing means are used at the air inlet, which fixing means are additionally used for fastening the inlet nozzle. In such an embodiment, the heat exchanger extends axially into the diagonal fan, so that the axial installation length of the entire system is also small.

In an advantageous embodiment, the diagonal fan is characterized in that the flange is located at a distance M from the air inlet and is positioned at the housing at a distance N relative to the axial air outlet of the diagonal fan, wherein the ratio M/N is fixed, i.e. 0.70. ltoreq. M/N.ltoreq.1.3, particularly preferably a ratio of 0.5, i.e. the flange is arranged centrally on the housing.

The flange is preferably of annular configuration.

Furthermore, in the case of a diagonal fan, the inlet nozzle can be detachably fixed to the housing as a separate component.

Furthermore, an embodiment is advantageous in which the fixing means for the inlet nozzle are formed in such a way that they securely accommodate both the inlet nozzle and, alternatively, the heat exchanger. For this purpose, for example, holes can be provided in the material of the housing, which holes are matched in position and size to the inlet nozzle and the heat exchanger.

In a further development, the diagonal fan provides that the housing has a truncated portion at the air inlet, the edge of which is dimensioned close to the housing diameter at the air outlet, so that a space-saving installation is possible when the diagonal fan is immersed in a heat exchanger having a rectangular cross section. In addition, the installation height of the heat exchanger can be minimized.

In the case of a diagonal fan, in a further embodiment, the diagonal impeller is then, viewed in the axial flow direction, provided with a redirecting device having a plurality of circumferentially distributed guide blades which homogenize the air flow generated by the diagonal impeller.

An advantageous embodiment provides in the diagonal fan that the redirecting means is formed in one piece with the housing. The number of parts and assembly steps can be reduced. Sealing between components may also be omitted.

In a further development, the redirecting arrangement has a protective grid which extends over the outlet section of the diagonal fan. The axial length of the protective grid is here less than 50% of the maximum axial length of the redirecting device.

An embodiment variant of the diagonal fan in which the redirecting means, the housing and the protective grid are formed in one piece is also advantageous.

In an advantageous embodiment, the protective grid also has a plurality of annular webs arranged coaxially with one another, each annular web forming opposing web surfaces extending parallel to the axial flow direction. Thus, the flow is directed parallel along the web surface over the entire axial length of the protective grid.

In a development of the diagonal fan, the annular webs in the region of the guide blades are configured to project axially to the flow-on edge of the respective guide blade. The guide vane can thus be formed in part by the projection of the annular web, so that the web surface formed by the annular web in the region of the guide vane is enlarged axially. In addition, the axially projecting portion of the annular web can serve as a reinforcing portion of the guide vane.

The guide vanes of the redirecting device can have different shapes and cross sections. In an advantageous embodiment, the guide vanes are arcuately curved, as seen in axial cross-section, and are additionally or alternatively profiled. For example, the bearing surface shape, i.e. the convexly curved shape, can be a contoured shape. Thus, different angles of attack of the diagonal impeller used can be taken into account. In this case, a straight radial extension of the guide blades is possible.

In addition to the embodiment in which the curve is forward or backward as viewed in axial cross section, in a further alternative embodiment the guide blades of the redirecting device can be formed so as to be curved in three dimensions, that is to say the curvature also occurs in the axial extension.

An advantageous embodiment of the diagonal fan also provides that the guide blades of the redirecting device enter the protective grid directly and therefore interact directly in terms of flow technology.

In addition to the redirecting means, the diagonal impeller also comprises a hub with impeller blades fastened or configured thereon. The dimensions of the two hubs or hub regions are preferably such that the maximum diameter G of the hub region of the redirecting device is greater than the maximum diameter F of the hubs of the diagonal impellers, so that the hub region of the redirecting device, viewed in axial projection, covers the hubs of the diagonal impellers.

A further advantageous solution for the axially compact embodiment of the diagonal fan is characterized in that the redirecting device in the hub region has a motor mount for the electric motor. In this case, the hub region of the redirecting device can also be designed to be axially retracted, so that, viewed in radial section, the motor component and the redirecting device overlap.

An advantageous embodiment of the diagonal fan also provides that the diagonal impeller has a collar which surrounds the impeller blades distributed in the circumferential direction. The baffle ring achieves a precisely adjustable angle of attack and a flow path at a predetermined angle to the axis of rotation of the diagonal impeller.

Another advantageous aspect is to configure the electric motor as an external rotor motor in the case of a diagonal fan. The diagonal impeller can thus envelop the motor and the axial position requirement is minimized.

The improvement of the diagonal fan also provides that the inlet nozzle preferably extends in the axial direction into the securing ring, so that, viewed in radial section, the inlet nozzle and the securing ring overlap.

Drawings

Further advantageous developments of the invention are shown in greater detail below in conjunction with the description of preferred embodiments of the invention with the aid of the drawings. The figure is as follows:

figure 1 shows an exploded perspective view of a diagonal fan with a view to the entry side,

FIG. 2 is an exploded perspective view of the diagonal fan of FIG. 1 with a view to the discharge side;

figure 3 is a view in radial section of the diagonal fan in figure 1,

figure 4 is a perspective cross-sectional view of the diagonal fan of figure 1,

fig. 5 to 8 show diagonal fans in various installation situations with heat exchangers.

Detailed Description

An embodiment of a diagonal fan 1 according to the invention is shown in fig. 1 to 4.

In the exploded views according to fig. 1 and 2, the components of the housing 2 with the stationary redirecting device 3 constructed in one piece, the components of the diagonal impeller 4, the components of the electric motor 5 constructed as an external rotor motor, and the components of the inlet nozzle 6 which can be inserted into the housing 2 can be seen.

The diagonal fan 1 is shown in the assembled state in fig. 3 to 4 and has a total axial length E. The diagonal impeller 4 comprises a plurality of impeller blades 9 extending radially outwardly from an axially open hub 8, the impeller blades being surrounded by a retaining ring 14. The collar 14 has a flow cross section which widens radially outwards in the axial flow direction and faces the inner wall of the housing 2. The electric motor 5 is inserted into the axially open hub 8 of the diagonal impeller 4 and is thereby completely closed. In the axial direction, i.e. along the axis of rotation, the electric motor 5 extends into a recess 11 in the center of the axis, so that this recess can be positioned closer to the diagonal impeller 4. A diagonal impeller 4 driven via an electric motor 5 is arranged within the flow channel-forming housing 2 and has an axial length D. On the inlet side, the inlet nozzle 6 is arranged and extends with its end section of the smallest flow cross section (diameter a) into the region of the diagonal impeller 4, so that the end of the baffle ring 14 and the inlet nozzle 6 overlap.

The housing defines two axial fastening planes X, Y for fastening the heat exchanger 200, 200' to the housing 2 in two different axial positions. The first axial position is at a fastening plane X extending through the flange 25 on the peripheral face of the casing 2. The second axial position and the corresponding fastening plane are formed by the fixing means as screw holes for screwing the inlet nozzle 6 to the air inlet 21.

Fig. 5 to 8 show the diagonal fan 1 in various installation situations with heat exchangers 200, 200'. The heat exchanger 200 according to fig. 5 comprises a nozzle 201, which replaces the inlet nozzle 6 of the diagonal fan 1. With its rest face 205 facing the diagonal fan 1, the heat exchanger 200 is fixed to the fastening plane Y at the screw holes for the inlet nozzles 6. The nozzle 201 extends into the diagonal impeller 4 and forms an overlap region with this nozzle comparable to the inlet nozzle 6.

In the embodiment according to fig. 6, the diagonal fan 1 is equipped with an inlet nozzle 6, wherein the heat exchanger 200' is fastened with the inlet nozzle 6 at its rest face 205 facing the diagonal fan 1, however no nozzle is required, as in the example of fig. 5.

The embodiment according to fig. 7 also uses a diagonal fan 1 with an inlet nozzle 6, but the rest face 205 facing the diagonal fan 1 is implemented radially outwards, so that the fastening takes place by means of screws on the annular flange 25 and the diagonal fan 1 is thus positioned with its axially extending half in the heat exchanger 200'. Fig. 8 shows the same embodiment as fig. 7, however with the diagonal fan 1 press fitted, that is to say the air outlet into the heat exchanger 200'.

Reference is now primarily made again to fig. 3. In operation, the diagonal fan 1 sucks in air in the axial direction via the diagonal impeller 4 and conveys it diagonally, that is to say at a predetermined outflow angle relative to the axis of rotation in the direction of the inner wall of the housing 2. In the embodiment shown, the outflow angle is determined obliquely radially outward via the collar 14. Then, on the inner wall of the housing 2, the flow is deflected again in the axial flow direction and is conveyed towards the redirecting device 3.

The air outlet of the diagonal fan 1 has a predetermined discharge diameter B, wherein in the embodiment shown the ratio of the total axial length E to the discharge diameter B is 0.38. The ratio may be increased to 0.6 or decreased to 0.3. In the air inlet 21 formed by the inlet nozzle 6 (in the region of the smallest flow cross section of the inlet nozzle), the diagonal fan 1 has a suction diameter a which is 0.87 smaller than the discharge diameter B. The ratio may be adjusted in the range of 0.70-0.95. The deflection required for the flow in the radially outer region is therefore small.

When viewed in the axial flow direction, the connecting diagonal impeller 4 is arranged with a redirecting device 3 having a plurality of guide vanes 7 distributed in the circumferential direction. The redirecting device 3 also comprises an integral protective grid 17 having a plurality of annular webs 13 arranged coaxially to one another, each of which forms a web surface 19 extending parallel to the axial flow direction and opposite thereto. The axial length of the protective grid 17 corresponds to half the axial length C of the redirecting device 3. The maximum flow cross section (diameter B) of the redirecting device is located on the outlet side in the region of the annular web 13. The redirecting device 3 equalizes the flow by means of the guide vanes 7 and the protective grid 17. The guide vanes 7 extend in the axial direction through the protective grid 17 and thus break the annular web 13 as a type of arcuate radial web, as can be seen in fig. 2.

Referring to fig. 3, the diagonal impeller extends over an axial impeller width D. In the embodiment shown, the ratio of the axial extension C of the redirecting means to the width D of the impeller has a value of 0.5, but can be in the range from 0.30 to 0.75, in particular set between 0.4 and 0.5. The ratio of the maximum diameter G of the hub region of the redirecting device 3 to the maximum diameter F of the hub 8 of the diagonal impeller 4 is also shown, where G > F.

Fig. 1 and 3 also show that the annular web 13 in the region of the stator blade 7 is configured to project axially in the section 12 relative to the incident flow edge of the respective stator blade 7 and thus ensures the reinforcement and support of the stator blade 7. The guide vanes 7 are curved arcuately when viewed in axial cross section and are curved radially outward in a radial section according to fig. 3, so that a three-dimensional total curvature results. Furthermore, the guide blades 7 are profiled in the radial section according to fig. 3 according to the bearing surface, wherein their respective thickness initially increases and then decreases again, as viewed in the axial direction.

Claims

1. Diagonal fan, characterized in that it comprises an electric motor (5), a casing (2) and diagonal impellers (4), the diagonal impeller being accommodated in the housing and being drivable by the motor, a diagonal flow of the diagonal impeller, which is generated in operation, being deflected by an inner wall of the housing in the axial flow direction, wherein the housing (2) is configured at its air inlet (21) to securely accommodate an inlet nozzle (6), and wherein the housing has at least two axial fastening planes for fastening the heat exchanger to the housing (2) in two different axial positions, wherein a first fastening plane is formed by a flange (25) on the peripheral face of the housing (2), and the second fastening plane is formed by a fixing means for the inlet nozzle at said air inlet.

2. The diagonal fan according to claim 1, wherein the flange (25) is located at a distance M from the air inlet (21) and at a distance N from the axial air outlet of the diagonal fan (1) at the housing, wherein the ratio M/N is fixed, i.e. 0.70. ltoreq. M/N. ltoreq.1.3 applies.

3. Diagonal fan according to claim 1 or 2, characterized in that the inlet nozzle (6) is detachably fastenable as a separate component on the housing (2).

4. Diagonal fan according to claim 1 or 2, wherein the fixing means of the inlet nozzle (6) are configured to accommodate both the inlet nozzle and alternatively the heat exchanger.

5. The diagonal fan according to claim 2, wherein the casing (2) has a truncated portion at the air inlet, the edge of the truncated portion being dimensioned close to the casing diameter at the air outlet, thereby enabling a space-saving installation when dipping the diagonal fan (1) into a heat exchanger having a rectangular cross-section.

6. The diagonal fan according to claim 1 or 2, characterised in that, viewed in the axial flow direction, next to the diagonal impeller (4) a redirecting device (3) is arranged, which has a plurality of guide blades (7) distributed in the circumferential direction, which guide blades balance the air flow generated by the diagonal impeller.

7. The diagonal fan according to claim 6, wherein the redirecting device (3) has a protective grid (17) extending over the output section of the diagonal fan (1) and having an axial length smaller than the total axial length of the redirecting device (3).

8. The diagonal fan according to claim 7, wherein the redirecting means, the casing (2) and the protective grid (17) are constructed in a single piece.

9. The diagonal fan of claim 7, wherein the protective grid has a plurality of annular webs arranged coaxially with one another, the annular webs each configuring opposed web surfaces extending parallel to the axial flow direction.

10. The diagonal fan according to claim 9, wherein the annular web in the region of the guide blades (7) is configured to project axially with respect to the flow-incident edge of the respective guide blade.

11. The diagonal fan according to claim 6, wherein the guide blades (7) of the redirecting device (3) are arcuately curved and/or contoured in plane, viewed in axial cross section.

12. The diagonal fan according to claim 6, wherein the maximum diameter G of the hub area of the redirecting means (3) is larger than the maximum diameter F of the hub (8) of the diagonal impeller (4), such that the hub area of the redirecting means (3) covers the hub of the diagonal impeller as seen in axial projection.

13. Diagonal fan according to claim 12, characterized in that the redirecting means (3) in the hub area has a motor support for the electric motor (5).

14. Diagonal fan according to claim 6, characterized in that the diagonal impeller (4) has a collar (14) which surrounds the impeller blades (9) distributed in the circumferential direction and sets the outflow angle of the impeller blades.

15. Diagonal fan according to claim 14, characterized in that the inlet nozzle (6) is arranged on the suction side on the casing (2) and extends in axial direction into the collar (14).