Tube fan designed as radial fan

Abstract

The invention relates to a tube fan (1), in particular a radial fan designed with a motor (10) and a radial impeller (11), comprising a housing, which has an inlet housing (2) on the inlet side and an outlet housing (3) on the outlet side, the inlet housing defining an inlet section (52) and receiving the radial impeller (11), the outlet housing (3) defining an outlet section (53), wherein a cup-shaped motor holder (5) is arranged within the outlet housing (3), wherein a continuous flow channel (20) leading to the outlet section (53) is formed between the motor holder (5) and the outlet housing (3), through which flow (S) generated by the radial impeller (11) during operation is guided.

Description

TECHNICAL FIELD

[0001] The invention relates to a duct fan, which is designed in particular as a radial fan with a motor and a radial impeller. BACKGROUND

[0002] Duct fans are used to generate an airflow through a duct arrangement with a predetermined duct diameter inside the duct arrangement. A distinction is made between so-called inline duct fans, in which the maximum housing diameter of the duct fan corresponds to the duct diameter of the duct arrangement. Axial fans and diagonal fans are particularly suitable for this application. Their advantages lie in the compact design and the good flow guidance. However, they do not achieve the pressure and efficiency of radial fans. This is the reason why axial fans and diagonal fans for high flow rates are used at low pressure.

[0003] When radial fans with axial intake and radial exhaust are used to achieve higher pressure, the housing diameter of the housing accommodating the radial fan is always significantly greater than the duct diameter of the duct arrangement. Therefore, radial fans cannot be used in the inline variant. SUMMARY

[0004] The invention is intended to propose a duct fan, which is designed in particular as a radial fan. It is known from the prior art to construct the housing in multiple parts and to integrate a motor holder for the motor of the radial fan in the housing part on the outlet side. The radial impeller of the radial fan requires the flow to be blown into the outlet-side housing part without being influenced and then into the adjacent duct arrangement. This leads to a recirculation zone and a flow separation in the housing part on the exhaust side This has a negative effect on both efficiency and noise formation.

[0005] It is therefore an object of the invention to provide a duct fan designed as a radial fan, whose flow guidance is improved, thereby increasing the efficiency while reducing the noise formation.

[0006] This object is achieved by the technical solution described below.

[0007] According to the invention, a duct fan, in particular designed as a radial fan with a motor and a radial impeller, is proposed, which comprises a housing, which has an intake housing on the intake side and an exhaust housing on the exhaust side, which intake housing defines an intake section and receives the radial impeller, and which exhaust housing defines an exhaust section. A cup-shaped motor holder is arranged within the exhaust housing for fixedly receiving a motor. A continuous flow channel leading to the exhaust section is formed between the motor holder and the exhaust housing, through which flow generated by the radial impeller during operation is guided.

[0008] As in the prior art, the housing of the duct fan is mounted to the adjacent ducting to be flowed through. In comparison to the ducting, the inlet housing and the outlet housing define a larger diameter. The respective housing shape of the inlet housing and the outlet housing provides a widening for increasing the diameter and subsequently a narrowing to the diameter of the ducting, viewed in the flow direction. The flow created by the radial fan is created a flow channel by the at least partially cup-shaped motor holder in the outlet housing and thus a defined flow guidance from the radial impeller to the outlet section, which minimizes recirculation zones and flow separation. This has a positive effect on the efficiency and reduces the noise.

[0009] A further advantageous refinement of the duct fan provides that a plurality of guide posts distributed in the circumferential direction are arranged in the flow channel. The guide posts are preferably designed as radial struts, which form a guiding surface for the flow extending through the flow channel.

[0010] In an advantageous embodiment of the duct fan, the guide posts extend from the outer side surface of the motor holder to the inner wall surface of the outlet housing and divide the flow channel in the circumferential direction into a plurality of separate passages. Due to the radial extension of the guide posts from the wall to the wall, the separate passages are closed between one another and preferably only converge again in the outlet section.

[0011] The particularity of the preferred variant is that the guide posts are integrally formed on the motor holder. This reduces the number of parts and the effort required for assembling the motor holder to the outer housing.

[0012] In the prior art, the motor holder can generally be integrally formed with the outlet housing. In the inventive duct fan, however, the motor holder is designed as a separate component. In order that an advantageous and simple assembly can be possible, it is provided that a receiving groove is provided on the outlet housing for fixedly inserting a fastening web formed on the motor holder. The motor holder can thus be fixed positionally in the outlet housing, but at the same time be detachably fastened. The receiving groove is preferably formed in the tubular end of the outlet housing which defines the outlet section. In this region, the receiving groove has virtually no influence on the flow.

[0013] In a particularly advantageous design variant of the duct fan, the fastening web on the motor holder is formed by the guide posts. The guide posts thus assume the function of guiding the flow through the flow channel and of fastening the motor holder to the outlet housing.

[0014] The flow channel between the outlet housing and the motor holder is ensured by the two housing wall sections thereof. The motor holder comprises a housing which tapers in cross section in the flow direction and this tapering essentially corresponds to the cross section of the outer housing, so that the flow channel has an essentially constant flow width. The guide posts, however, preferably extend outwardly in the axial flow direction beyond the housing of the motor holder which forms the flow channel, in particular into the outlet section and thus guide the flow into the adjacent ducting.

[0015] On the axial side facing the radial impeller, the flow channel-forming shell of the motor holder has, in an advantageous embodiment, an axial protrusion encircling in the circumferential direction. The axial protrusion defines an inlet section of the flow channel and protrudes axially opposite the guide post in the direction of the radial impeller. In other words, the guide post begins to extend in the flow channel at an axial distance from the axial outer edge of the shell of the motor holder.

[0016] The aerodynamically advantageous design of the ducted fan also provides that the guide post is curved in sections in the circumferential direction. A curved course is particularly preferred. The curved course is provided in particular in the region of the motor holder area in which the shell is located. In the subsequent sections, the guide post extends in the axial flow direction, i.e. parallel to the axis of rotation of the radial fan.

[0017] The noise reduction of the ducted fan is positively enhanced by the following further solution, wherein the wall section of the shell of the motor holder forming the flow channel is designed to be perforated by through-holes through which a sound-damping and sound-insulating material can then be introduced into the shell. In one preferred embodiment, the shell of the motor holder has a motor seat for holding the axial center of the motor and defines an accommodation space between the inner wall surface of the perforated wall section and the motor seat. The accommodation space can be used in the same way for arranging the sound-damping and sound-insulating material.

[0018] A further solution also provides for noise reduction of the ducted fan, in particular in the region of the shell. To this end, in the region of the flow channel, the exhaust shell has radial widenings in the circumferential direction, viewed between the guide posts, which are designed to accommodate sound-damping and sound-insulating material. In an axial top view, the widenings distributed in the circumferential direction by the exhaust shell form a kind of flower shape. The radial widenings extend along the extension between every two guide posts and are therefore preferably curved or twisted into an arc shape in the circumferential direction as well. The sound-damping and sound-insulating material is preferably injected directly into the radial widenings of the exhaust shell. For example, sound-insulating foam can be used as sound-insulating material.

[0019] In order to advantageously channel the airflow generated by the radial impeller into the flow channel, the ducted fan is distinguished in that the maximum outer diameter of the intake side of the shell of the motor holder is greater than the outer diameter of the radial impeller. Furthermore, in one advantageous embodiment, the intake section defines an inlet nozzle which extends in the axial flow direction into the inlet opening of the radial impeller.

[0020] In the case of the ducted fan, an advantageous further solution also provides that the mutually superimposed intake shell and exhaust shell can be fixed to one another by means of a fixing device and thereby determine the position of the motor holder in the exhaust shell. For example, a clamp or bayonet catch can be used as a fixing device. In particular, the motor holder is positioned and fixed between the intake shell and the exhaust shell. BRIEF DESCRIPTION OF DRAWINGS

[0021] Further advantageous developments of the application are presented in more detail below together with the description of a preferred embodiment of the application with reference to the accompanying drawings. In the drawings, the following is shown:

[0022] Figure 1 Cross-sectional view of an embodiment of a ducted fan according to the application. DETAILED DESCRIPTION

[0023] Figure 1 A cross-sectional view of a ducted fan 1 designed as a radial fan is shown. The ducted fan 1 comprises two housing parts, namely an inlet housing 2 designed as an inlet side and an outlet housing 3 designed as an outlet side. The inlet housing 2 comprises a tubular inlet section 52 and the outlet housing 3 comprises a tubular outlet section 53, via which the ducted fan 1 is mounted to an external ducting arrangement on the inlet side and on the outlet side. Furthermore, the flow passage diameter of the inlet housing 2 and the outlet housing 3 is significantly larger for the design of a radial fan. A radial fan with an electric motor 10 and a radial impeller 11 driven by the electric motor 10 is arranged in the inlet housing 2. The radial impeller 11 comprises a cover disk, a base disk and impeller blades running therebetween. In operation, the radial impeller 11 sucks in a flow S axially through the inlet section 52 and blows it radially in the direction of the inner wall surface of the inlet housing 2.

[0024] The electric motor 10 is fastened to an axial center of a cup-shaped motor holder 5 on a motor base 22, which is in turn accommodated and fixed in the outlet housing 3. The cup-shaped motor holder 5 comprises a housing 6, to the axial center of which the motor base 22 is integrally formed, and guide posts 4 which are also integrally formed on the outside of the housing 6, preferably in the circumferential direction. Between the housing 6 of the motor holder 5 and the outlet housing 3, a continuous flow channel 20 is formed which leads to the outlet section 53, through which the flow S generated by the radial impeller 11 is guided during operation. The flow channel 20 is divided into individual passages by the guide posts 4, since the guide posts 4 extend continuously from the outer surface of the housing 6 of the motor holder 5 to the inner wall surface of the outlet housing 3. In the downstream region of the housing 6, the individual passages then converge again to form the flow channel. The guide posts 4 extend beyond the housing 6 of the motor holder 5 forming the flow channel 20 and into the tubular outlet section 53 in the axial flow direction. On the axial side facing the radial impeller 11, the guide posts 4 are spaced apart from the axial edge of the housing 6 by axial protrusions 12. The axial protrusions 12 extend parallel to the axis of rotation of the radial fan 11. The inlet flow in the flow channel 20 is therefore initially determined only by the housing 6 and the outlet housing 3. Only in the region of the flow channel 20 where the housing 6 begins to taper, the flow is guided through the guide posts 4. The maximum outer diameter of the housing 6 of the motor holder 5 on the inlet side is greater than the outer diameter of the radial impeller 11.

[0025] To this end, the guide posts 4 are segmented in the circumferential direction. A preferred curved bending 63 is particularly advantageous, but other continuous bends can also be provided as desired, including an S-shaped course. The bending direction is preferably coordinated with the direction of rotation of the radial fan 11. The guide posts 4, which extend parallel to the axial flow direction, end in the discharge section 53. The guide posts 4 guide the flow S along the housing 6 of the motor holder 5 and the exhaust housing guide through the flow channel 203.

[0026] In the discharge section 53, a plurality of receiving grooves 9 are formed for fixedly accommodating the guide posts 4. The guide posts 4 are inserted into the receiving grooves 9 to mount the motor holder 5 in the exhaust housing 3, thereby fixing the motor holder 5 in the exhaust housing 3. Alternatively, although not shown, a variant is also included in which fastening webs independent of the guide posts 4 are arranged or formed on the motor holder 5 and fix the motor holder 5 in the receiving grooves 9 of the exhaust housing 3. The intake housing 2 and the exhaust housing 3 are superposed on one another and fixed to one another by means of the clamps 51. The motor holder 5 is positioned between the housing parts of the intake housing 2 and the exhaust housing 3 by means of a portion of the guide posts 4 and fixed and secured in place by means of fastening. In particular, it is ensured that the guide posts 4 are completely pushed into the receiving grooves 9 when the clamps 51 are fixed.

[0027] The wall section of the housing 6 of the motor holder 5 has a plurality of through-holes 8, which form openings. The through-holes 8 are dimensioned to decrease in the flow direction. A sound-deadening material (not shown) is inserted into the receiving space 15 between the housing 6 of the motor holder 5 and the motor base 22 to minimize the noise formed along the housing 6 by the flow. The perforation through the through-holes 8 increases the effect of the sound-deadening material. Furthermore, radial widenings 7 are formed on the exhaust housing 3 in the region between the guide posts 4, which have a course in the circumferential direction and in the axial direction corresponding to the course of the guide posts 4. The sound-deadening material (at reference 77, but not shown) is also introduced into the widenings 7, preferably in the manner of injection molding. In this way, noise reduction is also achieved at the exhaust housing 3.

Claims

1. A tubular fan (1) designed as a radial fan having a motor (10) and a radial impeller (11), the tubular fan comprising a housing having an inlet shell (2) on an inlet side and an exhaust shell (3) on an exhaust side, the inlet shell defining an inlet section (52) and receiving the radial impeller (11), the exhaust shell (3) defining an exhaust section (53), wherein a cup-shaped motor retainer (5) for fixedly receiving the motor (10) is arranged within the exhaust shell (3), wherein the motor retainer (5) is designed as a separate part The motor retainer is detachably fixed in the exhaust housing (3), wherein a continuous flow channel (20) leading to the exhaust section (53) is formed between the motor retainer (5) and the exhaust housing (3), through which the flow (S) generated by the radial impeller (11) during operation is guided, wherein a plurality of guide posts (4) distributed in the circumferential direction are arranged in the flow channel (20), wherein a receiving groove (9) is provided on the exhaust housing (3) for fixedly inserting into the fastening web formed on the motor retainer (5).

2. The tubular fan according to claim 1, characterized in that, The guide post (4) extends from the outer side of the motor retainer (5) to the inner wall surface of the exhaust shell (3) and divides the flow channel (20) into multiple separate channels in the circumferential direction.

3. The tubular fan according to claim 1 or 2, characterized in that, The guide post (4) is integrally formed on the motor retainer (5).

4. The tubular fan according to claim 1, characterized in that, The receiving groove (9) is formed in the tubular end of the exhaust shell (3) that defines the exhaust section (53).

5. The tubular fan according to claim 1 or 4, characterized in that, The fastening web is formed by the guide post (4).

6. The tubular fan according to any one of claims 1-2 and 4, characterized in that, The guide post (4) extends outward in the axial flow direction beyond the shell (6) of the flow channel (20) forming the motor retainer (5).

7. The tubular fan according to claim 6, characterized in that, The housing (6) of the motor retainer (5) forming the flow channel (20) has an axial protrusion (12) that surrounds the flow channel (20) in a circumferential direction, the axial protrusion defining the inlet section of the flow channel (20) and protruding axially in the direction of the radial impeller (11) opposite to the guide post (4).

8. The tubular fan according to any one of claims 1-2 and 4, characterized in that, The guide post (4) extends in a segmented, curved manner in the circumferential direction and terminates in the axial flow direction.

9. The tubular fan according to claim 8, characterized in that, The guide post (4) extends in an arc shape in the circumferential direction.

10. The tubular fan according to claim 6, characterized in that, The motor retainer (5) is formed by one of the flow channels (20) or the wall section of the housing (6) is designed to be perforated through a through hole (8).

11. The tubular fan according to claim 6, characterized in that, The housing (6) of the motor retainer (5) has a motor base (22) for holding the axial center of the motor (10), and a receiving space (15) for accommodating sound-absorbing and sound-insulating material is defined between the inner wall surface of the perforated wall section of the housing (6) and the motor base (22).

12. The tubular fan according to any one of claims 1-2 and 4, characterized in that, Accordingly, when viewed along the circumferential direction, the exhaust shell (3) in the flow channel (20) region has a radially widened portion (7) between the guide posts (4), the radially widened portion being designed to accommodate sound-absorbing and sound-insulating material.

13. The tubular fan according to any one of claims 1-2 and 4, characterized in that, The overlapping air intake shell (2) and the air exhaust shell (3) can be fixed to each other by a fixing device, thereby determining the position of the motor retainer (5) in the air exhaust shell (3).

14. The tubular fan according to claim 6, characterized in that, The maximum outer diameter of the inlet side of the housing (6) of the motor retainer (5) is greater than the outer diameter of the radial impeller (11).

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