Fan device

Abstract

There is provided a fan device configured to transport air from a first region to a second region. The fan device comprises a hub (200) configured to rotate around a central axis 5 (212). The fan device also comprises a plurality of tubes (202, 204, 206) for transporting air. The plurality of tubes (202, 204, 206) are fixed to the hub (200) such that the plurality of tubes (202, 204, 206) rotate with the hub (200). Each tube of the plurality of tubes (202, 204, 206) has a passage (208, 210, 214) extending between the first region and the second region. Each tube of the plurality of tubes (202, 204, 206) has an internal 0 cross-section that varies along the passage (208, 210, 214).

Description

[0001] FAN DEVICE

[0002] Technical Field

[0003] The present disclosure relates to a fan device configured to transport air from a first region to a second region.

[0004] Modern telecommunications (“Telco”) and computing equipment often require cooling in order for the equipment to operate in an optimal manner. For example, T elco equipment, such as router systems (e.g. comprising baseband and router components), use forced air cooling systems to draw in cool air and expel warm air. An example of such a forced air cooling system is a fan tray. A fan tray can be placed at the rear of a computing unit in order to remove heat from computing components within the computing unit. Typically, a fan tray is composed of multiple fans, providing redundancy for (e.g. single) fan failure, and to provide increased airflow. A fan tray can be configured to provide front-to-rear airflow for the fan tray unit, such that an airflow passes through the computing unit (i.e. entering a front portion of the computing unit and exiting a rear portion of the computing unit).

[0005] Fan cooling systems typically generate noise. The noise is generated from air turbulence caused by fan propellors passing through the air. The human ear is very sensitive to noise frequencies that range between 1 Khz and 5Khz. Indeed, such noise frequencies can create annoying / irritating sound to humans (see Figure 1). The noise generated by fan cooling systems is in the frequency range detectable by human ears and therefore operators / engineers (e.g. a Telco operator working in an office installing a computer cabinet) working with equipment which utilize forced air cooling systems can be hampered or impaired by the noise.

[0006] The maximum noise generated by computing (e.g. telecommunications) equipment is regulated by international standards, such as the European Telecommunications Standards Institute (ETSI) and the American National Standards Institute (ANSI). For example, ETSI defines the noise limit for indoor equipment, of class 3.2 and 3.3, in an unsecured Telco room as 7.5 Bel (A), where Bel (A) is an A-weighted Bel. For a secured Telco room, ETSI defines the noise limit for indoor equipment, of class 3.2 and 3.3, as 7.2 Bel (A). As another example, ANSI defines the maximum limit (e.g. as disclosed in Generic Requirements 63 (GR-63) document “NEBS Requirements: Physical Protection”) for indoor Telco room as 7.8 Bel (A).

[0007] Computing units (e.g. telecommunications equipment) is often installed in a rack (e.g. a server rack). As such, the physical space occupied by computing units can be described in terms of rack units (Rlls). A computing unit of dimension 1 RU can sometimes be referred to as a “Pizza Box”. The dimensions of forced air cooling systems are configured so as to match that of their computing unit implementation. For example, fan dimensions for a typical 1 Rll Pizza Box can be configured based on the dimensions of Pizza Box. Such fan dimensions are relatively small. For example, the fan units themselves can have dimensions of around 40x40mm with the fan propeller having even smaller dimensions (e.g. a propeller length of around 6mm).

[0008] Current computing components (e.g. in a 1 RU pizza-box) can have a power consumption of more than 400 Watts (W) and so very high-speed fans are required in order to create enough air pressure to remove heat. In general, the higher the propeller speed (e.g. measured in rotations per minute (RPM)), the higher the noise produced by the fan. As such, the level of noise produced by Telco equipment can be very high during high traffic conditions. Computing equipment has been, and is still, experiencing a miniaturization trend such that advances in computing equipment require greater power capabilities within more limited airflow space and volume. This has resulted in a need for fan cooling systems with propeller speeds in the range of tens of thousands of RPM.

[0009] Some attempts have been made to reduce the noise generated by fan units. For example, some existing fan units attempt to reduce generated noise by using fan blades with curved profiles. However, such existing techniques result in reduced airflow (e.g. intake) and air pressure. As a result, the fan-cooling capacity of such fan units is also disadvantageously reduced.

[0010] Summary

[0011] As mentioned above, there are certain challenges associated with existing fan units. In particular, existing fan configurations which attempt to reduce noise generation generally result in a reduction in airflow, which is disadvantageous for certain fan implementations, such as fan cooling. It is therefore an objective of the disclosure to obviate or eliminate the above-described disadvantages associated with existing techniques.

[0012] Therefore, according to an aspect of the disclosure, there is provided a fan device. The fan device is configured to transport fluid from a first region to a second region. The fan device comprises a hub configured to rotate around a central axis. The fan device also comprises a plurality of tubes for transporting fluid. The plurality of tubes are fixed to the hub such that the plurality of tubes rotate with the hub. Each tube of the plurality of tubes has a passage extending between the first region and the second region. Each tube of the plurality of tubes has an internal cross-section that varies along the passage.

[0013] According to another aspect of the disclosure, there is provided a fan device. The fan device is configured to transport air from a first region to a second region. The fan device comprises a hub configured to rotate around a central axis. The fan device also comprises a plurality of tubes for transporting air. The plurality of tubes are fixed to the hub such that the plurality of tubes rotate with the hub. Each tube of the plurality of tubes has a passage extending between the first region and the second region. Each tube of the plurality of tubes has an internal cross-section that varies along the passage.

[0014] According to another aspect of the disclosure, there is provided a cooling fan assembly. The cooling fan assembly comprises at least one fan device, as described herein.

[0015] According to another aspect of the invention, there is provided a fan tray. The fan tray comprises a cooling fan assembly, as described herein.

[0016] According to another aspect of the invention, there is provided a rack. The rack comprises a cooling fan assembly, as described herein, and / or a fan tray, as described herein.

[0017] Thus, in the manner described herein, there is provided an improved fan device for transporting fluid (e.g. air) from a first region to a second region. The fan device is improved as it comprises a plurality of tubes, fixed to a hub, that transport the fluid. The geometry of the plurality of tubes is variable such that the fluid pressure at the first region (e.g. back-end side of the fan device) is increased, resulting in a greater flow of fluid from the first region to the second region. The plurality of tubes allow for a fan device which provides high fluid pressure (e.g. via a jet effect), while at the same time providing noise reduction. As such, the improved fan device maintains fluid flow pressure while minimising turbulence, and thus minimising noise generated by the fan device. Furthermore, the fan device described herein exhibits improved energy efficiency thanks to the increased pressure of fluid flow provided by the plurality of tubes.

[0018] In addition, the fan device described herein can be conveniently configured for cooling fan assemblies which can, for example, be used for cooling existing computing (e.g. Telco) equipment (e.g. in a server room). As such, current computing systems (e.g. server racks) require no modification in order to benefit from cooling fan assemblies comprising the fan device described herein.

[0019] Brief description of the drawings

[0020] For a better understanding of the techniques, and to show how they may be put into effect, reference will now be made, by way of example, to the accompanying drawings, in which:

[0021] Figure 1 is a graph illustrating a sensitivity of humans and mice to certain frequencies of noise;

[0022] Figures 2 to 5 are schematic illustrations of a fan device according to some embodiments;

[0023] Figure 6A is a schematic illustration of a tube, according to an embodiment;

[0024] Figure 6B is a schematic illustration of a fan device according to an embodiment;

[0025] Figures 7 to 9 are schematic illustrations of a tube element, according to an embodiment;

[0026] Figure 10 is a schematic illustration of a fan device according to an embodiment;

[0027] Figure 11 is a schematic illustration of a fan assembly according to an embodiment; and

[0028] Figures 12 and 13 are graphs illustrating the performance of an existing fan and a fan device according to an embodiment, respectively. Detailed Description

[0029] Generally, all terms used herein are to be interpreted according to their ordinary meaning in the relevant technical field, unless a different meaning is clearly given and / or is implied from the context in which it is used. All references to a / an / the element, apparatus, component, means, step, etc. are to be interpreted openly as referring to at least one instance of the element, apparatus, component, means, step, etc., unless explicitly stated otherwise. The steps of any methods disclosed herein do not have to be performed in the exact order disclosed, unless a step is explicitly described as following or preceding another step and / or where it is implicit that a step must follow or precede another step. Any feature of any of the embodiments disclosed herein may be applied to any other embodiment, wherever appropriate. Likewise, any advantage of any of the embodiments may apply to any other embodiments, and vice versa. Other objectives, features and advantages of the enclosed embodiments will be apparent from the following description.

[0030] Some of the embodiments contemplated herein will now be described more fully with reference to the accompanying drawings. Other embodiments, however, are contained within the scope of the subject-matter disclosed herein, the disclosed subject-matter should not be construed as limited to only the embodiments set forth herein; rather, these embodiments are provided by way of example to convey the scope of the subject-matter to those skilled in the art.

[0031] As mentioned above, there is provided herein a fan device. A fan device can be understood to be a device that is used to create a flow of fluid (e.g. air). The fan device described herein comprises a plurality of tubes for transporting air. The plurality of tubes are fixed to a (e.g. central) hub of the fan device such that the plurality of tubes rotate (e.g. synchronously) with the hub. The hub and the plurality of tubes can rotate around a central axis (e.g. in operation of the fan device). The fan device described herein can be referred to as an axial-flow fan. An axial flow fan can be understood to be a fan that forces fluid (e.g. air) to move parallel to an axis about which propellors of the fan rotate. Herein, the plurality of tubes of the fan device can force fluid to move parallel to the central axis.

[0032] As mentioned herein, the fan device is configured to transport fluid from a first region to a second region. The first region may correspond to a fluid intake region of the fan device and / or the second region may correspond to a fluid output region of the fan device. The fluid may, for example, comprise a liquid and / or a gas. The liquid may, for example, comprise one or more of water, oil (e.g. mineral oil), and coolant. The gas may comprise, for example, one or more of air, carbon dioxide, and refrigerant gas. It will be understood that these are merely examples of a fluid, and that other types of fluid may be beneficially transported by the fan device described herein.

[0033] Figure 2 illustrates a fan device according to an embodiment. The fan device is configured to transport fluid from a first region to a second region. As illustrated in Figure 2, the fan device comprises a hub 200 configured to rotate around a central axis 212. The central axis 212 can be referred to herein as the (e.g. axial) axis of rotation of the fan device. As also illustrated in Figure 2, the fan device comprises a plurality of tubes 202, 204, 206. As illustrated in Figure 2, In some examples, the plurality of tubes 202, 204, 206 may comprise three tubes. However, it will be understood that this is merely an example, and that the plurality of tubes may comprise any number (e.g. two or more) of a plurality of tubes, such as four tubes, five tubes, six tubes, etc.

[0034] A tube, as referred to herein, may be understood to be an elongated, hollow structure that is configured to facilitate the passage of fluid. An elongated structure can be understood to mean a structure (e.g. body) that has a length that is greater than its width. A tube may have an internal cross-section and an external cross-section. The internal cross-section and the external cross-section may be different (e.g. depending on a wall thickness of the tube). The internal cross-section of the tube may define a flow capacity of the tube. The external cross-section of the tube may define a structural integrity of the tube.

[0035] As illustrated in Figure 2, the plurality of tubes 202, 204, 206 are fixed to (e.g. disposed on) the hub 200 such that the plurality of tubes 202, 204, 206 rotate with the hub 200. The plurality of tubes 202, 204, 206 can be fixed to (e.g. coupled to and / or extend from) the hub 200 such that the plurality of tubes rotate synchronously with the hub 200 around the central axis 212. As illustrated in Figure 2, in some examples, the plurality of tubes 202, 204, 206 may be fixed to an exterior surface of the hub 200. As also illustrated in Figure 2, the exterior surface of the hub 200 may comprise a cylindrical surface. In some examples, the plurality of tubes 202, 204, 206 may be fixed to the cylindrical surface of the hub 200, as illustrated in Figure 2. In some examples, the exterior surface of the hub 200 may form a wall of each tube of the plurality of tubes 202, 204, 206. In some examples, the plurality of tubes 202, 204, 206 may be fixed to the hub 200 by being disposed on the (e.g. exterior surface of the) hub 200.

[0036] As also illustrated in Figure 2, each tube of the plurality of tubes 202, 204, 206 has a passage 208, 210, 214 extending between the first region, as defined herein, and the second region, as defined herein. With reference to the example of the fan device illustrated in Figure 2, the first region may be considered to be adjacent to the part of the fan device that is facing into the page (e.g. the underside of the fan device as shown in the example of Figure 2). Similarly, with reference to the example illustrated in Figure 2, the second region may be considered to be adjacent to the part of the fan device that is facing out of the page. Each tube of the plurality of tubes 202, 204, 206 has an internal cross-section that varies along the passage 208, 210, 214. Herein, a cross-section may be said to vary if an area and / or a shape of the cross-section varies. In some examples, the internal cross-section of each tube may be different at different points along the length of the passage of the tube. For example, the internal cross-section of each tube may vary at a constant rate along (e.g. at least a portion of) the passage of the tube. The internal cross-section of each tube may correspond to the cross-section of the passage of each tube. In some examples, an external cross-section of each tube of the plurality of tubes 202, 204, 206 may vary along the passage of each tube. In some examples, the internal cross-section of each tube may vary proportionally to the external cross-section of the tube. For example, the (e.g. internal and / or external) thickness of each tube can vary (e.g. increase or decrease) at a constant rate along the length of the passage of the tube.

[0037] As illustrated in Figure 2, in some examples, each tube of the plurality of tubes can comprise a first opening adjacent the first region, as defined herein, and a second opening adjacent the second region, as defined herein. In some examples, each tube may comprise only two openings (e.g. the first opening and the second opening referred to herein). The first opening can be a fluid intake of the tube. The second opening can be a fluid output of the tube. For each tube, fluid may enter the tube from the first region via the first opening, and exit the tube into the second region via the second opening. The passage of each tube may be defined by the first opening and the second opening. For example, the passage 208, 210, 214 of each tube may be terminated at the first opening and the second opening. In some examples, each tube of the plurality of tubes 202, 204, 206 may have only (e.g. no more than) two openings (e.g. the first opening and the second opening). Each tube of the plurality of tubes 202, 204, 206 may be impermeable to fluid (e.g. air) apart from at the first opening and the second opening.

[0038] Although not explicitly illustrated in Figure 2, in some examples, the first opening may be larger than the second opening. As such, in some examples, the fluid intake of each tube may be larger than the fluid output of each tube. As illustrated in Figure 2, in some examples, the first opening may have an, at least partially, elliptical cross-section. In some examples, the internal cross-section of each tube may decrease continuously along the passage from the first opening to the second opening. The size of the internal cross-section may be defined by a cross-sectional area. The internal cross-section of each tube may be defined by a plane that is perpendicular to the central axis 212. As illustrated in Figure 2, in some examples, the first opening and the second opening may be positioned at opposite ends of the tube. In other words, the first opening and the second opening can correspond to opposing openings of the tube.

[0039] As described herein, each tube of the plurality of tubes 202, 204, 206 around the hub (e.g. rotor) can have a larger first opening and terminate with a smaller (e.g. reduced diameter) opening (e.g. towards a back side of the fan device). In this way, the plurality of tubes 202, 204, 206 can collect fluid (e.g. airflow) at a lower pressure and increase pressure towards the output region (e.g. the second region referred to herein). The variable internal cross-section of each tube provides for reduction in resonance of air turbulence, and thus reduces noise generation. As a result, the fan device described herein minimizes fluid turbulence while maximizing fluid pressure by channeling fluid via the plurality of tubes 202, 204, 206.

[0040] As illustrated in Figure 2, in some examples, each tube of the plurality of tubes 202, 204, 206 may extend along a surface of the hub 200. For example, as also illustrated in Figure 2, each tube may extend along the exterior surface of the hub 200. As illustrated in Figure 2, in some examples, each tube of the plurality of tubes 202, 204, 206 can be curved around the hub 200 to extend axially along the central axis 212 and circumferentially about the central axis 212. As such, in some examples, a flowline of each tube, as defined herein, may not be perpendicular to the central axis. In some examples, each tube of the plurality of tubes 202, 204, 206 can be curved helically around the central axis 212. Thus, in some examples, each tube may form a shape that twists and / or coils around the hub 200 (e.g. central axis 212) in the form of a (e.g. partial) helix. The structure of each tube of the plurality of tubes 202, 204, 206 can move both around and along the central axis, as illustrated in Figure 2.

[0041] Figure 3 is a schematic illustration of the fan device according to an embodiment. The fan device illustrated in Figure 3 can be as described with reference to the fan device of Figure 2 above. More specifically, Figure 3 illustrates a different perspective view of the fan device illustrated in Figure 2. In the perspective view of the fan device of Figure 3, an example of the first opening of each tube of plurality of tubes 202, 204, 206 can be seen.

[0042] As illustrated in Figure 3, in some examples, the first opening of each tube may be angled to a flowline along the passage of the tube. Although not explicitly illustrated in Figure 3, in some examples, the second opening of each tube may be angled to the flowline along the passage of the tube. The flowline along the passage of the tube can represent a line of flow of fluid through the tube. For example, the flowline of the passage may correspond to a (e.g. geometric) centre line of the internal cross-section of the tube which passes along the passage of the tube. Herein, an opening being angled to the flowline along the passage can be understood to mean that a plane (e.g. forming a surface) of the opening is non-perpendicular to the flowline.

[0043] Herein, an opening (e.g. the first opening referred to herein, and / or the second opening referred to herein) may have an area. In some examples, the first opening may be larger than the second opening by virtue of the area of the first opening being larger than the area of the second opening. An area of an opening, as referred to herein, can be understood to refer to an area of a surface defined by the perimeter (e.g. edges) of the opening. For example, the area of an opening may correspond to a surface of least area where said surface is bounded by the edges of the opening (e.g. and an exterior surface of the hub). As illustrated in Figure 3, in some examples, the first opening, as referred to herein, may be irregularly shaped. As also illustrated in Figure 3, the first opening may comprise a plurality of edges. The plurality of edges of the first opening may comprise one or more arcs and / or curves. In some examples, as illustrated in Figure 3, the first opening may comprise at least four edges each in the form of an arc and / or curve.

[0044] As illustrated in Figure 3, in some examples, the fan device may comprise a plurality of blades 302, 304, 306. Each blade of the plurality of blades 302, 304, 306 may be coupled to a respective tube of the plurality of tubes 202, 204, 206. As illustrated in Figure 3, each blade may extend outwardly from the respective tube (e.g. to which it is coupled). For example, each blade may extend outwardly by extending away from the central axis 212. As illustrated in Figure 3, each blade of the plurality of blades 302, 304, 306 may have an outer edge. As also illustrated in Figure 3, in some examples, the outer edge of each blade may be in the form of an arc. Herein, an arc may be understood to refer to a continuous portion of a curve. In some examples, the arc formed by the outer edge of each blade may correspond to part of a circumference of a circle. The outer edge of the blade may be understood to correspond to an edge of the blade that has points positioned farthest from the central axis 212 (e.g. of any other point on the blade). In some examples, each point on the outer edge of the blade can be equidistant from the central axis 212.

[0045] Figure 4 is a schematic illustration of the fan device according to an embodiment. The fan device illustrated in Figure 4 can be as described with reference to the fan device of Figure 2 and / or Figure 3 above. In the perspective view of the fan device of Figure 4, an example of the second opening of each tube of the plurality of tubes 202, 204, 206 can be seen.

[0046] As illustrated in Figure 4, in some examples, the cross-section of the second opening of each tube of the plurality of tubes 202, 204, 206 may be at least partially elliptical. As also illustrated in Figure 4, in some examples, the second opening, as referred to herein, may comprise a plurality of edges. The plurality of edges of the second opening may comprise one or more arcs and / or curves. In some examples, as illustrated in Figure 3, the second opening may comprise at least two edges each in the form of an arc and / or curve.

[0047] As illustrated in Figure 4, in some examples, the fan device may comprise a housing 400. As also illustrated in Figure 4, the housing 400 can be configured to house the hub 200 and the plurality of tubes 202, 204, 206. In some examples, the hub 200 and the plurality of tubes 202, 204, 206 can be arranged to rotate relative to the housing 400. Thus, in some examples, the housing 400 may be configured not to rotate (e.g. with the hub 200 and / or the plurality of tubes 202, 204, 206). The housing 400 may be a structure and / or casing that surrounds and / or supports the hub 200 and the plurality of tubes 202, 204, 206. The housing 400 can be configured to protect the hub 200 and the plurality of tubes 202, 204, 206. The housing 400 may also assist in directing fluid flow (e.g. from the first region to the second region, as defined herein). In some examples, the housing 400 may comprise coupling means. The coupling means can be configured to couple (e.g. mount) the fan device to another structure. For example, the housing 400 may be configured to allow the fan device to be installed in a larger system (e.g. a fan assembly as described herein).

[0048] As illustrated in Figure 4, in some examples, the housing 400 may comprise an interior wall 402. As also illustrated in Figure 4, the interior wall 402 may be cylindrical. For example, the interior wall of the housing may correspond to a cylindrical surface. As mentioned herein (e.g. with respect to Figure 3), in some examples, the fan device can comprise a plurality of blades 302, 304, 306. As also mentioned herein, each blade can be coupled to a respective tube of the plurality of tubes 202, 204, 206, and can extend outwardly from the respective tube. As illustrated in Figure 4, in some examples, each blade of the plurality of blades 302, 304, 306 may extend between the respective tube and the interior wall 402 of the housing 400. In some examples, each point on the outer edge of each blade may be equidistant from the interior wall 402 of the housing 400.

[0049] Figure 5 is a schematic illustration of the fan device according to an embodiment. The fan device illustrated in Figure 5 can be as described with reference to the fan device of Figure 2, Figure 3, and / or Figure 4 above. More specifically, Figure 5 illustrates a different perspective view of the fan device illustrated in Figure 2 and Figure 3. In the perspective view of the fan device of Figure 5, an example of the first opening of each tube of the plurality of tubes 202, 204, 206 can be seen.

[0050] As illustrated in Figure 5, and as described herein, the plurality of tubes 202, 204, 206 are fixed to the hub 200 such that the plurality of tubes 202, 204, 206 rotate with the hub 200. As also illustrated in Figure 5, in some examples, the plurality of tubes 202, 204, 206 may be disposed at equal angular intervals around the hub 200. As illustrated in Figure 5, in some examples, the plurality of tubes 202, 204, 206 can be spaced apart from each other in a circumferential direction about the central axis 212. As such, in some examples, the plurality of tubes 202, 204, 206 may not be in contact with each other. In some examples, each tube of the plurality of tubes 202, 204, 206 may be identical (e.g. in shape).

[0051] In some examples, the fan device may comprise a fan drive configured to rotate the hub 200. The fan drive may be a motor that is configured to power the fan device. As illustrated in Figure 5, in some examples, the hub 200 can comprise a plurality of teeth 502. The plurality of teeth 502 can extend (e.g. protrude) from an interior surface of the hub 200. The fan drive may comprise one or more elements configured to engage with the plurality of teeth 502 (e.g. in order to drive the fan device). In some examples, the fan drive may be at least partially comprised inside the hub 200. For example, the fan drive may be at least partially comprised in an interior space 504 of the hub 200. The fan drive may be configured to rotate the hub and / or the plurality of tubes at any rotational speed. For example, the fan drive may be configured to rotate the plurality of tubes at a rotational speed of 12000 RPM to 34000 RPM. In some examples, the fan drive may be configured to rotate the plurality of tubes at a rotational speed of 12000 RPM, 18000 RPM, 25000 RPM, and / or 34000 RPM. In some examples, the fan drive may be configured to rotate the plurality of tubes at a rotational speed of more than 34000 RPM.

[0052] Figure 6A is a schematic illustration of a tube 602, as defined herein, in two different perspective views. The tube 602 illustrated in Figure 6A is an example of a tube of a plurality of tubes of the fan device. As illustrated in Figure 6A, the tube 602 has a passage. As such, the tube 602 can be a fluid conduit (e.g. air conduit).

[0053] As illustrated in Figure 6A, the tube 602 has an internal cross-section that varies along the passage. As also illustrated in Figure 6A, in some examples, the external crosssection of the tube 602 can vary along the (e.g. length of the) passage. For example, the internal cross-section and / or the external cross-section of the tube 602 may vary at a constant rate along the passage. In some examples, as illustrated in Figure 6A, the tube can have a first opening 604 and a second opening 606. As also illustrated in Figure 6A, in some examples, the first opening 604 can be larger than the second opening 606. In some examples, the internal cross-section and / or the external cross-section of the tube 602 may decrease (e.g. continuously) along the passage from the first opening 604 to the second opening 606.

[0054] In the example illustrated in Figure 6A, two different perspective views of the tube 602 are shown. The view on the left hand side of Figure 6A can be considered to show an unbent (non-curved) configuration of the tube 602. The view of the right hand side of Figure 6A can be considered to show a bent (curbed) configuration of the tube 602 (e.g. in an implementation in which the tube is curved around the hub, as described herein). Figure 6B is a schematic illustration of the fan device according to an embodiment. The fan device illustrated in Figure 6A can be as described with reference to the fan device of Figure 2, Figure 3, Figure 4, and / or Figure 5 above. More specifically, Figure 6 illustrates a different perspective view of the fan device illustrated in Figure 2, Figure 3, and Figure 5.

[0055] As illustrated in Figure 6B, in some examples, each tube of the plurality of tubes 202, 204, 206 may extend along a surface of the hub 200. As also illustrated in Figure 6B, each tube may extend along an exterior surface of the hub 200. The exterior surface of the hub may be cylindrical, as illustrated in Figure 6B. As also illustrated in Figure 6B, in some examples, each tube of the plurality of tubes 202, 204, 206 can be curved around the hub 200 to extend axially along a central axis, as defined herein, and circumferentially about the central axis. As such, in some examples, a flowline of each tube, as defined herein, may be non-perpendicular to the central axis. As illustrated in Figure 6B, in some examples, each tube of the plurality of tubes 202, 204, 206 can be curved helically around the central axis. Thus, in some examples, each tube may form a shape that twists and / or coils around the hub 200 (e.g. central axis) in the form of a (e.g. partial) helix. The structure of each tube of the plurality of tubes 202, 204, 206 can move both around and along the central axis, as illustrated in Figure 6B. As illustrated in Figure 6B, in some examples, each tube may not extend (e.g. axially) beyond the hub 200. As such, in some examples, (e.g. the length of) each tube of the plurality of tubes 202, 204, 206 may be bounded by the (e.g. geometry of the) hub 200.

[0056] Figures 7 to 9 are schematic illustrations of a tube element 702 which may form part of a tube, as defined herein. In more detail, Figures 7 to 9 illustrate different perspective views of the tube element 702.

[0057] In some examples, the tube element 702 may be coupled to the hub 200, as defined herein, in order to form a (e.g. complete) tube as defined herein. In such a scenario, the passage of the tube may be formed by the exterior surface of the hub and an interior surface of the tube element 702. The passage of each tube can be a fluid conduit (e.g. for transporting fluid such as air). The tube element 702 illustrated in Figure 7 may be understood to correspond to a cutaway (e.g. part) of a tube as defined herein. As such, although the tube element 702 may represent only a cutaway of a tube, it will be understood that a tube, as defined herein, can be described with reference to the tube element 702 of Figures 7 to 9.

[0058] As illustrated in Figures 7 to 9, each tube can comprise a first opening 704 and a second opening 706. As also illustrated in Figures 7 to 9, in some examples, the first opening 704 may be larger than the second opening 706. In some examples, as illustrated in Figures 7 to 9, the internal cross-section of each tube may be at least partially elliptical. For example, the internal cross-section of each tube can be defined by at least a convex elliptical arc and a concave elliptical arc. In some examples, the concave elliptical arc may be longer than the convex elliptical arc. The concave elliptical arc may be defined by the internal surface of the tube element 702 illustrated in Figures 7 to 9. Although not illustrated in Figures 7 to 9, the convex elliptical arc may be formed by the outer (e.g. cylindrical) surface of the hub, as defined herein.

[0059] As illustrated in Figures 7 to 9, the second opening 706 of the tube may comprise one or more edges. The one or more edges of the second opening 706 can comprise an edge formed by the tube element 702 and an edge formed by the (e.g. exterior surface of the) hub. As illustrated in Figures 7 to 9, a first edge of the second opening 706 may be formed by a continuous curve. The continuous curve of the first edge of the second opening 706 may terminate at the exterior surface of the hub. A second edge of the second opening 706 may be formed by a continuous curve. For example, the second edge of the second opening 706 may be formed by the exterior cylindrical surface of the hub, as defined herein.

[0060] As illustrated in Figures 7 to 9, the first opening 704 of the tube may comprise one or more edges. The one or more edges of the first opening 704 can comprise a plurality of edges formed by the tube element 702 and an edge formed by the (e.g. exterior surface of the) hub. As illustrated in Figures 7 to 9, a first edge, a second edge, and a third edge of the first opening 704 may each be (e.g. separately) formed by a continuous curve. The first edge, the second edge, and the third edge of the first opening can be edges of the tube element 702, as illustrated in Figures 7 to 9. The continuous curve of the first edge of the first opening 704 may terminate at the exterior surface of the hub and at the second edge of the first opening 704. The continuous curve of the second edge of the first opening 704 may terminate at the first edge of the first opening 704 and the third edge of the first opening 704. The continuous curve of the third edge of the first opening 704 may terminate at the second edge and the exterior surface of the hub. The one or more edges of the first opening 704 may comprise a fourth edge. The fourth edge of the first opening 704 may be formed by a continuous curve. For example, the fourth edge of the first opening 704 may be formed by the exterior cylindrical surface of the hub, as defined herein.

[0061] As described herein, the fan device may comprise a plurality of blades (e.g. as described with reference to Figure 3). As illustrated in Figures 7 to 9, in some examples, each blade 708 of the plurality of blades may extend outwardly from the tube (e.g. to which the blade 708 is coupled). Each tube of the plurality of tubes may be coupled to a single blade, according to some examples. As illustrated in Figures 7 to 9, in some examples, each blade 708 may extend along a length of the tube. For example, the blade 708 may extend along an entire length of the respective tube. The plurality of blades referred to herein and the plurality of tubes referred to herein may be made of the same material. In some examples, the plurality of tubes and / or the plurality of blades may be made of a material that is impermeable to fluid. For example, the material may be a gas (e.g. air) impermeable material.

[0062] Figure 10 is a schematic illustration of the fan device according to an embodiment. The fan device illustrated in Figure 10 can be as described with reference to the fan device of Figure 2, Figure 3, Figure 4, Figure 5, and / or Figure 6B above. More specifically, Figure 10 illustrates a different perspective view of the fan device illustrated in Figure 4. The fan device illustrated in Figure 10 includes some example dimensions of the fan device. It will be understood that these dimensions are merely exemplary, and that the fan device may be configured with alternative dimensions according to other examples.

[0063] As illustrated in Figure 10, in some examples, the fan device can comprise a housing 400. The housing 400 can comprise the hub and the plurality of tubes referred to herein. As illustrated in Figure 10, in examples in which the fan device comprises a plurality of blades, the housing 400 can comprise the plurality of blades. As also illustrated in Figure 10, in some examples, the exterior of the housing 400 may be substantially square shaped. In some examples, a (e.g. total) height of the housing 400 may be less than or equal to 40mm. Alternatively, or in addition, a (e.g. total) width of the housing may be less than or equal to 40 mm. It will be understood that these dimensions are merely exemplary, and the housing 400 may have any size and / or dimensions. As illustrated in Figure 10, the interior surface of the housing 400 can be cylindrical. In some examples, as illustrated in Figure 10, the interior surface of the housing 400 may have a constant diameter. For example, as illustrated in Figure 10, the diameter of the interior surface of the housing 400 may be around 38mm. As also illustrated in Figure 10, the hub may have an exterior cylindrical surface. The exterior cylindrical surface of the hub may have a constant diameter. For example as illustrated in Figure 10, the exterior cylindrical surface of the hub may have a diameter of around 24.9mm. In some examples, the diameter of the exterior surface of the hub may be 60-70% of the diameter of the interior surface of the housing 400.

[0064] As illustrated in Figure 10, in some examples, the outermost points of each tube of the plurality of tubes may be equidistant from the central axis, as defined herein. The outermost parts of each tube may be understood to mean the parts of each tube that are farthest from the central axis.

[0065] In some examples, the fan device referred to herein may be a cooling fan device. For example, the fan device may be configured to move fluid (e.g. air) to lower the temperature of an environment, system, and / or component by dissipating heat. The cooling fan device may be used in many different applications, such as for cooling electronic, automotive systems, and / or industrial equipment.

[0066] There is also provided herein a cooling fan assembly comprising at least one fan device as described herein.

[0067] Figure 11 is a schematic illustration of a fan assembly 1100 according to an embodiment. As illustrated in Figure 11 , the fan assembly 1100 comprises at least one fan device 1102. In the example illustrated in Figure 11 , the fan assembly 1100 comprises four fan devices. However, it will be understood that this is merely an example, and that the fan assembly 1100 can comprise any number of (e.g. one or more) fan devices according to other examples. The fan assembly 1100 may be used for cooling computing components.

[0068] The fan assembly 1100 defined herein may be a modular assembly that comprises multiple (e.g. cooling) fan devices. The fan devices may be arranged together in a frame and / or tray structure. As such, there is also provided herein a fan tray comprising a cooling fan assembly 1100 as described herein. The fan tray can be used to provide enhanced and efficient fluid (e.g. air) flow across a specific area or component. The fan tray and / or the fan assembly 1100 can be installed in (e.g. confined) spaces such as (e.g. server) racks, network cabinets, or other electronics enclosures. The fan tray, as described herein, and / or the fan assembly1100, as described herein, can be advantageously used in data centres, telecommunications equipment, and / or industrial control systems where heat management is crucial.

[0069] There is also provided herein a rack comprising a cooling fan assemblyl 100, as described herein, and / or a fan tray, as described herein. The rack can be a server rack.

[0070] Figures 12 and 13 are graphs illustrating a relationship between frequency and generated noise. Figure 12 corresponds to measurements obtained from an existing fan assembly. Figure 13 corresponds to measurements obtained from a fan assembly comprising a plurality of fan devices as described herein. In more detail, Figures 12 and 13 can be used to illustrate the noise reduction provided by the fan device defined herein.

[0071] The data illustrated in the graph of Figure 12 corresponds to noise measurement data from a fan tray comprising four existing commercial fans. During measurement, each of the existing fans were rotated with a rotational speed of 18000 RPM. As illustrated in Figure 12, there are some relatively significant noise components generated at frequency values of around 1.2Khz, 2.5Khz and 3.6Kz. Noises generated in these frequency ranges are known to be particularly annoying for humans. Note that, in Figure 12, the noise components at around 1.2KHz and 2.5KHz are equal and / or above -41 decibel- milliwatts (dBm).

[0072] The data illustrated in the graph of Figure 12 corresponds to measurement data from a fan tray comprising four fan devices as described herein. During measurement, each of the fan devices were rotated with a rotational speed of 18000 RPM. As illustrated in Figure 13, the noise components generated around 1.2Khz and 1.5KHz in the graph of Figure 12 are not present in the graph of Figure 13. In fact, as illustrated in Figure 13, all noise components of the graphed signal are below -46.9 dBm. The overall result is that the fan device described herein provides a noise power reduction of 50% (or overall 3dB) when compared to existing fans.

[0073] Although not illustrated in Figures 12 or 13, thrust tests have also been carried out to verify the ability of the fan device defined herein to pressurize and / or de-pressurize air. Single fan comparative tests between existing fans and the fan device described herein show beneficial performance of the fan device described herein. Typically, thrust values for commercial fans are in the range of about 9.0-9.8m / s. The fan device described herein produced a thrust of 9.2 m / s, which is in line with commercial performance.

[0074] Therefore, as described herein there is provided an improved fan device for transporting air form a first region to a second region. The configuration of the fan device provides for significant noise reduction (e.g. compared to existing fans) while maintaining equivalent fluid (e.g. air) pressure (e.g. for a given rotational speed). Advantageously, the fan device described herein can be mounted in a fan assembly. The fan assembly can be configured to have a similar structural footprint to existing fan assemblies such that there is no need for modification of current equipment building practices (e.g. for Telco equipment). The use of the fan device described herein improves energy efficiency as a result of the increased pressure of fluid flow (e.g. directed to components to be cooled). Indeed, it is estimated that the utilisation of the fan device described herein could result in a power saving of 10-15%.

[0075] It should be noted that the above-mentioned embodiments illustrate rather than limit the idea, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. The word “comprising” does not exclude the presence of elements or steps other than those listed in a claim, “a” or “an” does not exclude a plurality, and a single processor or other unit may fulfil the functions of several units recited in the claims. Any reference signs in the claims shall not be construed so as to limit their scope.

Claims

CLAIMS1. A fan device, configured to transport air from a first region to a second region, the fan device comprising: a hub (200) configured to rotate around a central axis (212); and a plurality of tubes (202, 204, 206) for transporting air, wherein the plurality of tubes (202, 204, 206) are fixed to the hub (200) such that the plurality of tubes (202, 204, 206) rotate with the hub (200), wherein each tube of the plurality of tubes (202, 204, 206) has a passage (208, 210, 214) extending between the first region and the second region, and wherein each tube of the plurality of tubes (202, 204, 206) has an internal cross-section that varies along the passage (208, 210, 214).

2. The fan device of claim 1, wherein the plurality of tubes (202, 204, 206) are arranged on an exterior surface of the hub (200).

3. The fan device of any of the preceding claims, wherein an external cross-section of each tube of the plurality of tubes (202, 204, 206) varies along the passage.

4. The fan device of any of the preceding claims, wherein the internal cross-section of each tube varies at a constant rate along the passage (208, 210, 214).

5. The fan device of any of the preceding claims, wherein each tube of the plurality of tubes (202, 204, 206) comprises a first opening (604) adjacent the first region, and a second opening (606) adjacent the second region.

6. The fan device of claim 5, wherein the first opening (604) is larger than the second opening (606).

7. The fan device of claim 5 or 6, wherein the internal cross-section of each tube decreases continuously along the passage (208, 210, 214) from the first opening (604) to the second opening (606).

8. The fan device of any of claims 5 to 7, wherein the first opening (604) and the second opening (606) are positioned at opposite ends of the tube.

9. The fan device of any of claims 5 to 8, wherein:the first opening (604) is angled to a flowline along the passage (208, 210, 214); and / or the second opening (606) is angled to a flowline along the passage (208, 210, 214).

10. The fan device of any of the preceding claims, wherein the passage (208, 210, 214) of each tube of the plurality of tubes (202, 204, 206) is an air conduit.

11. The fan device of any of the preceding claims, wherein the passage (208, 210, 214) of each tube of the plurality of tubes (202, 204, 206) terminates at the first opening (604) and the second opening (606).

12. The fan device of any of the preceding claims, wherein the internal cross-section of each tube is at least partially elliptical.

13. The fan device of claim 12, wherein the internal cross section of each tube is defined by a convex elliptical arc and a concave elliptical arc.

14. The fan device of claim 13, wherein the concave elliptical arc is longer than the convex elliptical arc.

15. The fan device of claim 13 or 14, wherein the convex elliptical arc is formed by an exterior surface of the hub (200).

16. The fan device of any of the preceding claims, wherein the plurality of tubes (202, 204, 206) are disposed at equal angular intervals around the hub (200).

17. The fan device of any of the preceding claims, wherein the plurality of tubes (202, 204, 206) are spaced apart from each other in a circumferential direction about the central axis (212).

18. The fan device as claimed in any of the preceding claims, wherein each tube of the plurality of tubes (202, 204, 206) extends along a surface of the hub (200).

19. The fan device of claim 18, wherein each tube of the plurality of tubes (202, 204, 206) is curved around the hub (200) to extend axially along the central axis (212) and circumferentially about the central axis (212).

20. The fan device of claim 19, wherein each tube of the plurality of tubes (202, 204, 206) is curved helically around the central axis (212).

21. The fan device of any of the preceding claims, comprising: a housing (400) configured to house the hub (200) and the plurality of tubes (202, 204, 206), the hub (200) and the plurality of tubes (202, 204, 206) being arranged to rotate relative to the housing (400).

22. The fan device of claim 21 , wherein the housing (400) comprises an interior wall (402).

23. The fan device of claim 22, wherein the interior wall (402) is cylindrical.

24. The fan device of any of claims 21 to 23, wherein: a height of the housing (400) is less than or equal to 40mm, and / or a width of the housing (400) is less than or equal to 40mm.

25. The fan device of any of the preceding claims, comprising: a plurality of blades (302, 304, 306), wherein each blade is coupled to a respective tube of the plurality of tubes (202, 204, 206), wherein each blade extends outwardly from the respective tube.

26. The fan device of claim 25, when dependent on claim 22 or 23, wherein each blade of the plurality of blades (302, 304, 306) extends between the respective tube and the interior wall (402) of the housing (400).

27. The fan device of claim 25 or 26, wherein each blade of the plurality of blades (302, 304, 306) has an outer edge in the form of an arc.

28. The fan device of any of the preceding claims, comprising: a fan drive configured to rotate the hub (200).

29. The fan device of claim 28, wherein the fan drive is at least partially comprised inside the hub (200).2230. The fan device of claim 28 or 29, wherein the fan drive is configured to rotate the plurality of tubes (202, 204, 206) at a rotational speed of 12000 revolutions per minute, RPM, to 34000 RPM.

31. The fan device of any of the preceding claims, wherein the fan device is a cooling fan device.

32. A cooling fan assembly (1100) comprising at least one fan device as claimed in any of claims 1 to 31.

33. A fan tray comprising the cooling fan assembly (1100) of claim 32.

34. The fan tray of claim 33, further comprising a second cooling fan assembly (1100) according to claim 32.

35. A rack comprising the cooling fan assembly (1100) of claim 32, and / or the fan tray of claim 33 or 34.

36. The rack of claim 35, wherein the rack is a server rack.

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