A rotor hub for a gas sorption rotor and a rotor assembly

Abstract

The disclosure relates to a rotor hub (10) for a gas sorption rotor (101) comprising two rotor hub parts (1), with a shared rotational axis (A), wherein each rotor hub part (1) comprises a fastening mechanism (2) configured to connect one of the rotor hub parts (1) with the other rotor hub part (1), such that they together form a rotor hub (10) configured to be arranged in a center part (12) of the gas sorption rotor (101). The disclosure further relates to a rotor assembly (100).

Description

[0001] A rotor hub for a gas sorption rotor and a rotor assembly

[0002] Technical field

[0003] The present disclosure relates to a rotor hub for a gas sorption rotor and a rotor assembly.

[0004] Background art

[0005] Air treatment systems of various kinds are commonly used for providing treated air into a defined space. Such air treatment systems normally comprise some sort of gas sorption device with a gas sorption element. One such air treatment system involves dehumidifying air using a gas sorption rotor, commonly a desiccant rotor, also referred to as a desiccant wheel. The rotor rotates and thereby presents the desiccant in the rotor to the process and regeneration airstreams of the air treatment system. Regeneration may also be referred to as reactivation.

[0006] The desiccant rotor commonly comprises a rotor media with finely divided desiccant, impregnated into a semi-ceramic structure, which in appearance can resemble corrugated cardboard that has been rolled up into the shape of a wheel. The rotor rotates slowly between the process and regeneration airstreams. The process air flows through the flutes formed by the corrugations and the desiccant rotor either adsorbs or absorbs the moisture. Then, as the wheel rotates into the regeneration airstream, the desiccant is heated by the hot regeneration air, and the desiccant releases its moisture into the regeneration air.

[0007] Following regeneration, the desiccant rotates back into the process airstream, where the process repeats.

[0008] Gas sorption rotors are generally arranged on a rotating shaft, or axle, which stretches axially across the centre of the gas sorption rotor. Bearings for the rotating shaft are arranged either in a separate rotor hub arranged along the same axis as the shaft, or in cavities shaped in the rotor media. In circumstances where a rotor hub is used, it is normally arranged between the shaft and the rotor media.

[0009] Gas sorption rotors may have different dimensions, depending on the intended use. In circumstances where the gas sorption rotor has a large inner diameter, a machined rotor hub of metal is commonly used in order to tolerate the high strain of the rotor. Such rotor hubs are expensive and heavy. In circumstances where the gas sorption rotor has a small inner diameter, the inner parts of the rotor media are often used inefficiently. Furthermore, bearing seats are often machined into the rotor media, which wastes rotor media surface and risks damaging the rotor media. It is an object of the solution herein to mitigate, alleviate or eliminate one or more of the above-identified deficiencies and disadvantages in the prior art and solve at least the above-mentioned problem.

[0010] According to a first aspect, a rotor hub for a gas sorption rotor is provided. The rotor hub comprises two rotor hub parts, with a shared rotational axis A. Each rotor hub part comprises a fastening mechanism configured to connect one of the rotor hub parts with the other rotor hub part, such that they together form a rotor hub configured to be arranged in a center part of the gas sorption rotor.

[0011] The herein disclosed rotor hub provides weight and cost savings for the rotor assembly in which it is suitably used. Furthermore, the rotor hub provides support close to rotor end, which lowers strain in the rotor construction.

[0012] The two rotor hub parts are arranged adjacent each other along the shared rotational axis. The two rotor hub parts are thus arranged one after the other along the shared rotational axis. This way, by connecting the two rotor hub parts, a longer rotor hub can be achieved. In other words, the total length of the rotor hub is the sum of the length of each rotor hub part.

[0013] The rotor hub may be symmetric. The rotor hub parts may be referred to as duplicate parts.

[0014] Each rotor hub part may be manufactured as a single unit. That is, each rotor hub part may constitute a one piece or a single entity.

[0015] In gas sorption rotors, for which the rotor hub herein is suitably used, the rotor comprises a rotor media surrounding the rotor hub and the rotor is mounted on a rotating central shaft. Each of the rotor hub parts therefore advantageously comprises a central through-hole for receiving the rotating central shaft.

[0016] In rotors of significant width, it is not feasible to provide a rotor hub consisting of a single molded part, especially not with supports at the ends of the rotor hub. In some examples, the width may be considered significant when it is approximately twice the length of the radial extension of the active part of the rotor material. A configuration of the rotor hub as disclosed herein enables formation of supports at the rotor ends, even in rotors of a great width. Furthermore, the herein disclosed configuration allows for an arrangement of bearing seats close to the rotor ends. It is important to provide a highly controlled geometry at the rotor ends, which is possible due to the two-part configuration of the herein disclosed rotor hub.

[0017] Furthermore, the herein disclosed rotor hub allows for a rotor configuration where the rotor axis can be placed vertically, having the bottom rotor seal absorbing the weight of the rotor. Such a configuration may have beneficial size and tolerance constraints, compared to rotors with a horizontal rotor axis.

[0018] A rotor hub as disclosed herein is particularly suitable for use in rotor constructions where the volume of the rotor media is high enough to motivate the non-recurring engineering (NRE) cost for molds. Such an assessment may be based on various factors, such as costs relating to use of specialized tools, alternative ways of production etc.

[0019] The rotor hub may advantageously be airtight in a radial direction. Thereby, air is prevented from entering the rotor media through the rotor hub, which could otherwise adversely affect the performance of the various rotor sectors.

[0020] The rotor hub may also be airtight in an axial direction, thereby eliminating the risk of any leaks occurring between the two rotor hub parts and into the rotor media.

[0021] According to some examples, the fastening mechanism is a releasable fastening device. It is contemplated that that such a fastening device may enable disassembly and replacement of the rotor hub, and would thus allow for repair and maintenance. Furthermore, a releasable fastening mechanism would enable re-use of hub parts, which is both economically and environmentally beneficial.

[0022] Such a fastening device may comprise a bayonet type connection. Bayonet type connections, also referred to as bayonet catches, are easy to handle, while at the same time providing a firm connection that resists vibrations and other stresses that the rotor hub is exposed to, during operation of the rotor.

[0023] According to some examples, each rotor hub part comprises an aperture and a protrusion, the protrusion being L-shaped and arranged to fit in the aperture of the other rotor hub part and clasp the perimeter of the aperture of the other rotor hub part.

[0024] To reach a locked state, at least one of the rotor hub parts is rotated in relation to the other. When the L-shaped protrusion of one of the two rotor hub part aligns with the aperture of the other rotor hub part, the protrusion is inserted into the aperture if pressure or force in the direction of the other rotor hub part is exerted on at least one of the two rotor hub parts. Further rotation brings the L-shaped protrusion into contact with the contact surface of the rotor hub part, so that the contact surface of one of the rotor hub parts is clasped between an inner surface of the L-shaped protrusion and the contact surface of the other rotor hub part.

[0025] Such a connection provides a reliable and firm connection between the rotor hub parts. Due to its simple yet efficient configuration, such a connection is suitable for mass production and can be molded together with the hub part. Thus, there is no need to attach separate parts, which may loosen during operation of the rotor.

[0026] According to some examples, the releasable fastening device locks by snap-action. A snap-action fastener, which may be configured in any suitable way, provides a fast and easy connection. In addition, when a snap-action fastening device is used, the "snap" during connection provides an indication that a locked state has been reached.

[0027] Such a snap-action fastening device may be configured with a retractable pin in one of the two rotor hub parts and a corresponding aperture in the other rotor hub part. Each rotor hub part may comprise at least one retractable pin and one aperture. When connected, the retractable pin of a first rotor hub part is inserted into the aperture of a second rotor hub part. Correspondingly, the retractable pin of the second rotor hub part is inserted into the aperture of the first rotor hub part.

[0028] To reach a locked state, the rotor hub parts may first be arranged with their contact surfaces abutting each other. In such a position, the retractable pins of the rotor hub parts will be in a retracted state. Thereafter, one or both of the rotor hub parts may be rotated, such that the one or more pins align with their corresponding aperture. When the one or more pins align with the corresponding one or more apertures, the pins project through the aperture, reach an extended state and thereby block any further rotation of the rotor hubs parts in relation to each other. Thus, in the locked state, the rotor hub parts are fixed to each other and cannot rotate in relation to each other. Due to the configuration of the rotor hub parts, they are fixed in a radial position and cannot loosen during operation of the rotor.

[0029] Thereby, an even more stable connection may be achieved.

[0030] According to some examples, the fastening mechanism is a permanent fastening mechanism. The fastening mechanism may lock the rotor hub parts together by adhesion, for example. Such a fastening mechanism provides a firm connection between rotor hub parts and eliminates the need for manufacture of a fastening device.

[0031] Adhesives may also be used to attach the rotor hub parts to the rotor media, which contributes to increasing the stability of the rotor hub in the rotor and to avoid movement of the rotor hub in relation to the rotor media. In such examples, the adhesives may be applied to at least one of the rotor hub parts and / or to the surfaces of the rotor media in the center of the gas sorption rotor.

[0032] According to some examples, each rotor hub part comprises a contact surface at a first end of the rotor hub part and a bearing seat at a second end of the rotor hub part. The rotor hub parts are configured to be arranged with the contact surfaces abutting each other. Thus, the rotor hub parts are configured to be arranged with the first end of one of the rotor hub parts facing the first end of the other rotor hub part.

[0033] According to some examples, each rotor hub part comprises a contact surface and a bearing seat, the fastening mechanism being arranged at the contact surface and the bearing seat being arranged at a distance from the contact surface. The bearing seat may be any suitable bearing seat, such as a seat for a ball bearing, roller bearing or thrust bearing.

[0034] Each bearing seat may be arranged in a retracted position from the respective outer surfaces of the rotor media. By "retracted position", the intended meaning herein is that the bearing seats are located closer to the center of the rotor hub compared to the position of the outer surfaces of the rotor media. Thereby, the bearing seats are protected from pollutants and potentially damaging particles or the like, which may aggregate in the direct vicinity of the rotor media surface.

[0035] The contact surface may be essentially annular, comprising an inner circumference encircling the through-hole and having a diameter that is equal to, or larger than, the diameter of the through-hole. The bearing seat may be essentially annular, comprising an inner circumference encircling the through-hole and having a diameter that is equal to, or larger than, the diameter of the through-hole.

[0036] The fastening mechanism is advantageously arranged at the respective contact surface of each rotor hub part. Thereby, the fastening mechanism may be activated when the contact surfaces of each rotor hub part are brought into contact which other. In some examples, the fastening device comprises one or more apertures arranged in the contact surface of each rotor hub part and corresponding protrusions arranged on, or at, the contact surface of each rotor hub part. In other examples, a permanent fastener, such as an adhesive, is applied or attached to the contact surface of one or both rotor hub parts. When the contact surfaces are brought together, in such an example, the permanent fastening mechanism is activated and a firm connection is achieved between the two rotor hub parts.

[0037] Each rotor hub part may comprise a connecting structure configured to connect the first end of the rotor hub part with the second end of the rotor hub part. The connecting structure may comprise an outer sleeve and an inner sleeve. The outer sleeve is suitably configured to be arranged in contact with a rotor media of the gas sorption rotor surrounding the rotor hub. The inner sleeve may comprise the bearing seat. The outer sleeve may surround the inner sleeve circumferentially. The outer sleeve may be arranged radially outside the inner sleeve. Thus, the outer sleeve and the inner sleeve may be coaxially arranged. In some examples, the outer sleeve extends beyond the second end of the rotor hub part. The connecting structure may be a molded plastic sleeve. The inner sleeve of the connecting structure may have a frustoconical shape with the base at the first end of the rotor hub part and the top at the second end of the rotor hub part. Thus, the diameter of the inner sleeve may decrease from the first end of the rotor hub part towards the second end of the rotor hub part.

[0038] When the two rotor hub parts are connected to each other, with the contact surfaces at the first ends abutting each other, an inner volume delimited by the inner sleeves may be formed. When the rotor hub parts are connected, the outer sleeves will be essentially aligned and form an outer envelope surface of the rotor hub, configured to be arranged in contact with the rotor media.

[0039] Such a configuration of the rotor hub parts allows for arranging bearings close to the end surfaces of the rotor, even in rotors that have a large width.

[0040] The outer sleeve may be configured to be airtight. The airtightness may be achieved by choosing a suitable material for the outer sleeve, such as an airtight plastic material. In addition, the configuration of the outer sleeve should be such that the surfaces that are to be arranged against the rotor media are intact, and do not contain any apertures, slits, or the like. Thus, the outer sleeve further improves the airtightness of the rotor hub, achieved when the two rotor hub parts are connected.

[0041] The outer sleeve and the inner sleeve may be connected to each other via the contact surface of the rotor hub part. The outer sleeve and the inner sleeve may extend from the outer and inner circumference of the contact surface of the rotor hub part, respectively. The outer sleeve may comprise two sections. In one example, a first section is an essentially right cylinder and the second section is an essentially conical frustum. In such an example, at least the first section of the outer sleeve is arranged in contact with the rotor media.

[0042] According to some examples, each rotor hub part comprises at least one substantially radial projection, configured to extend into the rotor media surrounding the rotor hub. Each rotor hub part may comprise a plurality of substantially radial projections, for example two, three or four substantially radial projections. The projections may also be referred to as wings. Each rotor hub part is preferably equipped with as many substantially radial projections as is considered suitable for the situation at hand. The projections may have different shapes depending on the circumstances, such as the configuration of the rotor media, the size of the rotor, the size of the rotor hub parts etc. The projections may have a rounded first edge and an essentially straight second edge, wherein the first rounded edge is oriented toward the center of the rotor hub, i.e. toward the contact surface of the rotor hub part.

[0043] The at least one radial projection provides a support against rotation of the rotor hub part in relation to the rotor media. Thus, the substantially radial projections contribute to stabilizing the position of the rotor hub within the rotor, since they extend into the rotor media and thereby limit the risk of the rotor hub parts rotating in relation to the rotor media. In other words, the at least one substantially radial projection contributes to preventing angular displacement of the rotor hub part in relation to the rotor media.

[0044] In an example where each rotor hub part comprises an inner sleeve and an outer sleeve, the substantially radial projection is beneficially arranged on the outer sleeve. In order to achieve a uniform contact with the rotor media, the substantially radial projections are distributed evenly along the outer sleeve. In examples where the rotor hub parts comprise one or more substantially radial projections, the rotor hub is preferably assembled first, and the rotor media is thereafter attached to the rotor hub. In examples where the fastening mechanism is a releasable fastening mechanism, such as a bayonet connection, the two rotor hub parts are first connected to each other by means of the fastening mechanism to form the rotor hub. Thereafter the rotor media is attached to the rotor hub, since rotation of the rotor hub parts could otherwise damage the rotor media, in examples where the substantially radial projections extend into the rotor media.

[0045] In some examples, the substantially radial projections may be configured to project from the rotor hub after the rotor hub has been inserted into the center of the gas sorption rotor. Such a configuration may for example be achieved by employing a suitable type of spring bias, which can be used to move the projection from a retracted position inside of the rotor hub part to an extended position on the outside of the rotor hub part. In the extended position, the substantially radial projection extends into the rotor media. Such a mechanism for moving the at least one substantially radial projection from a retracted to an extended state does not need to be spring-loaded, but may be achieved with any other suitable means, such as a screw. According to some examples, the rotor hub parts are essentially identical. By "essentially", the intended meaning herein is that the rotor hub parts are identical in the relevant aspects thereof, such as having identical fastening mechanisms. It is not considered relevant if one of the rotor hub parts is provided with some auxiliary part that is unrelated to the other hub part and / or to the function of the two-part rotor hub. Additionally or alternatively, the rotor hub parts may be essentially symmetrical.

[0046] Amongst other benefits, providing a rotor hub configured with essentially identical rotor parts contributes to a more efficient manufacturing. Furthermore, the handling of the parts is more flexible, since there is no need to provide two matching parts to each rotor where a hub is to be assembled.

[0047] According to some examples, the rotor hub parts are molded plastic parts. The rotor hub parts may, for example, be injection molded plastic parts. Injection molded plastic parts are cost-efficient to produce, lightweight and durable.

[0048] According to some examples, the two rotor hub parts are configured to extend along the full width of the rotor, when connected. Thereby, increased stability of the rotor hub as well as even further improved airtightness of the hub is achieved. Additionally, there is no need for auxiliary supporting parts.

[0049] According to a second aspect a rotor assembly, comprising a gas sorption rotor and the rotor hub disclosed herein, is provided.

[0050] Effects and features of the second aspect are to a large extent analogous to those described above in connection with the first aspect. Examples of the present solution mentioned in relation to the first aspect are compatible with the second aspect.

[0051] The rotor hub may be assembled in any suitable way. A method for assembling the rotor hub may comprise as many as necessary of the following steps:

[0052] - providing two rotor hub parts; - if needed, attaching or applying the fastening mechanism to the contact surface of each rotor hub part;

[0053] - inserting the first of the two rotor hub parts into the rotor from one side of the rotor;

[0054] - inserting the second of the two rotor hub parts into the rotor from a second, opposite, side of the rotor;

[0055] - bringing the respective contact surfaces of the two rotor hub parts into contact; and

[0056] - if needed, positioning the rotor hub parts to achieve a locked state.

[0057] In an alternative method for assembling the rotor hub, the two rotor hub parts are connected to each other first to form the rotor hub, and thereafter the rotor media of the gas sorption rotor is applied or attached to the outer surfaces of the connected rotor hub. The rotor media may be applied or attached to, or on, the outer surface of the rotor hub in any suitable manner. To improve the attachment between the rotor hub and the rotor media, a suitable adhesive may be applied to one or both of the rotor media and the rotor hub, such that the rotor hub and the rotor media are glued together.

[0058] In examples where the rotor hub parts are attached by means of a fastening device, the rotor hub parts are positioned using any appropriate action when both parts have been inserted into the rotor, to achieve a locked state in which the rotor hub parts are firmly connected to each other. For example, when the fastening device is a bayonet type fastener, the rotor hub parts, when inserted, are positioned by rotating them in relation to each other until the locked state is reached.

[0059] In examples where the rotor hub parts are connected by means of a permanent fastening mechanism such as by adhesive, the fastening mechanism is attached or applied to each rotor hub part prior to insertion of the rotor hub parts. In examples here an adhesive is used, the respective contact surfaces of the two rotor hub parts are brought into contact with each other, whereby the connection between the two rotor hub parts is achieved. In some examples, the adhesive may be a two-component adhesive.

[0060] The present solution will become apparent from the detailed description given below. The detailed description and specific examples disclose preferred embodiments of the invention by way of illustration only. Those skilled in the art understand from guidance in the detailed description that changes and modifications may be made within the scope of this disclosure. Hence, it is to be understood that the herein disclosed invention is not limited to the particular component parts of the device described or steps of the methods described since such device and method may vary. It is also to be understood that the terminology used herein is for purpose of describing particular embodiments only, and is not intended to be limiting. It should be noted that, as used in the specification and the appended claim, the articles "a", "an", "the", and "said" are intended to mean that there are one or more of the elements unless the context explicitly dictates otherwise. Thus, for example, reference to "a unit" or "the unit" may include several devices, and the like. Furthermore, the words "comprising", "including", "containing" and similar wordings does not exclude other elements or steps.

[0061] Brief of the

[0062] The above objects, as well as additional objects, features and advantages of the present invention, will be more fully appreciated by reference to the following illustrative and non-limiting detailed description of example embodiments, when taken in conjunction with the accompanying drawings.

[0063] Figure 1A shows a perspective view of the rotor hub according to examples of the present disclosure.

[0064] Figure IB shows an exploded view of the rotor hub according to examples of the present disclosure.

[0065] Figure 2A shows a perspective view of a rotor hub part according to examples of the present disclosure.

[0066] Figure 2B shows a cross-sectional perspective view of the rotor hub according to examples of the present disclosure.

[0067] Figure 3 shows a cross-sectional view of the rotor hub according to examples of the present disclosure.

[0068] Figure 4 shows a perspective cross-sectional view of the rotor hub according to examples of the present disclosure.

[0069] Figure 5 shows a perspective view of a rotor assembly according to examples of the present disclosure. Detailed description

[0070] The present disclosure will now be described with reference to the accompanying drawings, in which preferred example embodiments of the disclosure are shown. The disclosure may, however, be embodied in other forms and should not be construed as limited to the herein disclosed embodiments. The disclosed embodiments are provided to fully convey the scope of the disclosure to the skilled person.

[0071] Figure 1A shows a perspective view of a rotor hub 10 arranged in a gas sorption rotor 101 according to some examples. The rotor hub 10 is rotating around a rotational axis A.

[0072] Figure IB shows a perspective exploded view of the rotor hub 10 and the gas sorption rotor 101. As shown in Fig. IB, the rotor hub 10 comprises two rotor hub parts 1, sharing the rotational axis A. Each rotor hub part 1 comprises a fastening mechanism 2 configured to connect one of the rotor hub parts 1 with the other rotor hub part 1, such that they together form a rotor hub 10 configured to be arranged in a center part 12 of the gas sorption rotor 101. Each of the rotor hub parts 1 shown in Fig. IB comprises a bearing seat 41 configured to accommodate a bearing 42 of a suitable type.

[0073] Although the gas sorption rotor 101 is shown in two parts in Fig. IB, the rotor hub 10 is compatible with any suitable gas sorption rotor 101.

[0074] Figure 2A shows a perspective view of a rotor hub part 1 according to some examples. Figure 2B shows a cross-sectional perspective view of the rotor hub 10, formed by connecting two rotor hub parts 1.

[0075] In the examples shown in Figs. 2A and 2B, the fastening mechanism 2 is a releasable fastening device 20. The releasable fastening device 20 in the examples of Figs. 2A and 2B comprises a bayonet type connection 21, where each rotor hub part 1 comprises an aperture 211 and a protrusion 212. As shown in Fig. 2A, the protrusion 212 may be arranged at, or on, a contact surface 31 of each rotor hub part 1. The aperture 211 may be arranged in the contact surface 31 of each rotor hub part 1, as in the example shown in Fig. 2A. Although the protrusion 212 may have any suitable shape, it is L-shaped in the example shown in Fig. 2A. The protrusion 212 is arranged to fit in the corresponding aperture 211, in order to achieve a bayonet type fastening mechanism 21. In the example shown in Figs. 2A and 2B, the protrusion 212 of one rotor hub part 1 is arranged to fit in the aperture 211 of the other rotor hub part 1 and clasp at least one side of the perimeter P of the aperture 211 of the other rotor hub part 1. When the protrusion 212 is brought into position, such that it extends beyond the perimeter P of the aperture 211, it extends over a portion of the contact surface 31 of the other rotor hub part 1. Thereby, the protrusion clasps the contact surface 31 of the other rotor hub part 1.

[0076] In Fig. 2B, the rotor hub parts 1 are arranged in a locked state, where they cannot rotate in relation to each other. To reach the locked state, at least one of the rotor hub parts 1 is rotated in relation to the other. When the L-shaped protrusion 212 of one of the two rotor hub parts 1 aligns with the aperture 211 of the other rotor hub part 1, the protrusion 212 is inserted into the aperture 211, if pressure or force in the direction of the other rotor hub part 1 is exerted on at least one of the two rotor hub parts 1. Further rotation brings the L-shaped protrusion 212 into contact with the contact surface 31 of the rotor hub part 1, so that the contact surface 31 of one of the two rotor hub parts 1 is clasped between an inner surface of the L-shaped protrusion 212 and the contact surface 31 of the other of the two rotor hub parts 1.

[0077] Although Figs. 2A and 2B show a bayonet type connection 21 with the abovementioned characteristics, other releasable fastening devices 20 are suitable for connecting the two rotor hub parts 1 together. The releasable fastening device 20 may, for example, lock the two rotor hub parts together by snap-action.

[0078] Alternatively, the fastening mechanism 2 may be a permanent fastening mechanism (not shown). Such a permanent fastening mechanism may, for example, lock the two rotor hub parts 1 together by adhesion.

[0079] Figure 3 shows a cross-sectional view of the rotor hub 10 according to some examples. In Fig. 3, each rotor hub part 1 comprises a contact surface 31 and a bearing seat 41. The fastening mechanism 2 (not shown in Fig. 3) is arranged at the contact surface 31 and the bearing seat 41 is arranged at a distance from the contact surface 31. The contact surface 31 is arranged at a first end 3 of the rotor hub part 1 and the bearing seat 41 is arranged at a second end 4 of the rotor hub part 1.

[0080] In the illustrated example in Fig. 3, each rotor hub part 1 comprises a connecting structure 5 configured to connect the first end 3 of the rotor hub part 1 with the second end 4 of the rotor hub part 1. The connecting structure 5 comprises an outer sleeve 51 that is to be arranged in contact with a rotor media 11 of the gas sorption rotor 101 (not shown in Fig. 3) surrounding the rotor hub 10. The connecting structure 5 also comprises an inner sleeve 52 comprising the bearing seat 41. The inner sleeve 52 may have a frustoconical shape with a diameter decreasing from the first end 3 towards the second end 4.

[0081] In Fig. 3, each rotor hub part 1 comprises at least one substantially radial projection 6, configured to extend into the rotor media 11 (not shown in Fig. 3) surrounding the rotor hub 10. The rotor hub parts 1 shown in Fig. 3 each comprises a plurality of substantially radial projections 6, arranged on the outer sleeve 51. Specifically, Fig. 3 shows two substantially radial projections 6 arranged on and distributed evenly along the outer sleeve 51. Although not shown in the figure, each rotor hub part 1 can be equipped with more than two substantially radial projections 6, for example three or four substantially radial projections 6. The substantially radial projections 6 shown in Fig. 3 exhibit a rounded first edge 61 and an essentially straight second edge 62, wherein the rounded first edge 61 is oriented toward the center of the rotor hub 10, i.e. toward the contact surface 31 of the rotor hub part 1.

[0082] Figure 4 shows a perspective cross-sectional view of the rotor hub 10 in a state where the two rotor hub parts 1 have been connected to form a rotor hub 10, with a shared rotational axis A. The rotor hub 10 may be airtight. The rotor hub 10 is arranged in the center part 12 of the gas sorption rotor 101. In Fig. 4, the rotor hub parts 1 are essentially identical. The rotor hub parts 1 may be molded plastic parts, such as injection molded plastic parts.

[0083] In the example shown in Fig. 4, the two rotor hub parts 1 together extend along the full width of the gas sorption rotor 101. In each of the rotor hub parts 1, the bearing seat 41 is arranged in a retracted position from the respective rotor media surface 11a, lib. Each of the rotor hub parts 1 comprises a central through-hole 9 for receiving a rotating central shaft 8 of the gas sorption rotor 101. The central through-hole 9 of each rotor hub part 1 is arranged at the second end 4 of the rotor hub part 1, at the level of the bearing seats 41. The gas sorption rotor 101 is mounted on the rotating central shaft 8. The rotating central shaft 8 extends through the rotor hub 10, along the axis A.

[0084] Fig. 4 also illustrates the position of the substantially radial projections 6, arranged so that they extend into the rotor media 11.

[0085] The rotor hub 10 may be assembled in any suitable way. The method for assembling the rotor hub 10 may comprise as many as necessary of the following steps:

[0086] - providing slOl two rotor hub parts 1; - if needed, attaching or applying sl02 the fastening mechanism 2 to the contact surface 31 (see e.g. Figs. 2A and 2B) of each rotor hub part 1;

[0087] - inserting sl03 a first of the two rotor hub parts 1 into the center 12 of the gas sorption rotor 101 from one side of the rotor 101;

[0088] - inserting sl04 a second of the two rotor hub parts 1 into the center 12 of the gas sorption rotor 101 from a second, opposite, side of the rotor 101;

[0089] - bringing sl05 the respective contact surfaces 31 of the two rotor hub parts 1 into contact; and

[0090] - if needed, positioning sl06 the rotor hub parts 1 to achieve a locked state.

[0091] In an alternative assembly method, the two rotor hub parts 1 are connected to each other first to form the rotor hub 10, and thereafter the rotor media 11 of the gas sorption rotor 101 is applied to the outer surfaces of the connected rotor hub 10. The rotor media 11 may be applied to, or on, the outer surface of the rotor hub 10 in any suitable manner. To improve the attachment between the rotor hub 10 and the rotor media 11, a suitable adhesive may be applied to one or both of the rotor media 11 and the rotor hub 10, such that the rotor hub 10 and the rotor media 11 are glued together.

[0092] In examples where the rotor hub parts 1 are attached by means of a releasable fastening device 20, the rotor hub parts are positioned sl06 using any appropriate action to achieve a locked state in which the rotor hub parts 1 are firmly connected to each other. In examples where the fastening device 20 comprises a bayonet type connection 21 (see e.g. Figs. 2A and 2B), the rotor hub parts 1 are positioned sl06 by rotating them in relation to each other until the locked state is reached.

[0093] In examples where the rotor hub parts 1 are connected by means of a permanent fastening mechanism such as by adhesive, the fastening mechanism 2 is attached or applied sl02 to one or both of the rotor hub parts 1. In examples where an adhesive is used, the respective contact surfaces 31 (see e.g. Fig. 3) of the two rotor hub parts 1 are brought sl05 into contact with each other, whereby a connection between the two rotor hub parts 1 is achieved. In some examples, the adhesive may be a two-component adhesive. Figure 5 shows a rotor assembly 100 comprising a gas sorption rotor 101 and the rotor hub 10 as disclosed herein. The rotor assembly 100 may also be referred to as an air treatment module. The rotor hub 10 comprises two essentially identical rotor hub parts 1 connected to each other, forming a rotor hub 10, which may be essentially airtight.

[0094] The rotor assembly 100 comprises an inlet part 102 and an outlet part 103, arranged on opposite sides of the gas sorption rotor 101. Air enters into the inlet part 102, passes through the rotor media 11 of the gas sorption rotor 101 and exits through the outlet part 103. The inlet part 102 may also be referred to as an inlet assembly and the outlet part 103 may also be referred to as an outlet assembly.

[0095] In the example shown in Fig. 5, the inlet part 102 of the gas sorption rotor 101 comprises a process fan 7 for achieving a process airflow through the rotor 101. The inlet part 102 or the outlet part 103 may comprise a drive unit (not shown) arranged to drive the rotating central shaft 8 and thereby rotate the gas sorption rotor 101.

[0096] In the example shown in Fig. 5, the rotor is suspended by means of suspension members 81, 82 connected to the rotating central shaft 8. Each of the suspension means 81, 82 are connected to a respective rotor hub part 1.

[0097] The person skilled in the art realizes that the present disclosure is not limited to the preferred embodiments described above. The person skilled in the art further realizes that modifications and variations are possible within the scope of the appended claims. Additionally, variations to the disclosed embodiments can be understood and effected by the skilled person in practicing the claimed disclosure, from a study of the drawings, the disclosure, and the appended claims.

Claims

CLAIMS1. A rotor hub (10) for a gas sorption rotor (101) comprising two rotor hub parts (1), with a shared rotational axis (A), wherein each rotor hub part (1) comprises a fastening mechanism (2) configured to connect one of the rotor hub parts (1) with the other rotor hub part (1), such that they together form a rotor hub (10) configured to be arranged in a center part (12) of the gas sorption rotor (101).

2. The rotor hub (10) according to claim 1, wherein the rotor hub (10) is airtight in a radial direction.

3. The rotor hub (10) according to claim 1 or 2, wherein the fastening mechanism (2) is a releasable fastening device (20).

4. The rotor hub (10) according to claim 3, wherein the fastening device (20) comprises a bayonet type connection (21).

5. The rotor hub (10) according to claim 1 or 2, wherein the fastening mechanism (2) is a permanent fastening mechanism (2), preferably a permanent fastening mechanism (2) that locks the rotor hub parts (1) together by adhesion.

6. The rotor hub (10) according to any one of the preceding claims, wherein each rotor hub part (1) comprises a contact surface (31) and a bearing seat (41), the bearing seat (41) being arranged at a distance from the contact surface (31).

7. The rotor hub (10) according to claim 6, wherein the contact surface is arranged at a first end (3) of the rotor hub part (1) and the bearing seat (41) is arranged at a second end (4) of the rotor hub part (1), each rotor hub part (1) further comprising a connecting structure (5) configured to connect the first end (3) of the rotor hub part (1) with the second end (4) of the rotor hub part (1).

8. The rotor hub (10) according to claim 7, wherein the connecting structure (5) comprises an outer sleeve (51) arranged in contact with a rotor media (11) of the gas sorption rotor (101) surrounding the rotor hub (101), and an inner sleeve (52).

9. The rotor hub (10) according to claim 8, wherein the inner sleeve (52) and the outer sleeve (51) are coaxially arranged.

10. The rotor hub (10) according to claim 8 or 9, wherein the inner sleeve (52) has a frustoconical shape with the base at the first end (3) of the rotor hub part (1) and the top at the second end (4) of the rotor hub part (1).

11. The rotor hub (10) according to any one of the preceding claims, wherein each rotor hub part (1) comprises at least one substantially radial projection (6), configured to extend into the rotor media (11) surrounding the rotor hub (10).

12. The rotor hub according to any one of the preceding claims, wherein the rotor hub parts (1) are essentially identical.

13. The rotor hub (10) according to any one of the preceding claims, wherein the rotor hub parts (1) are molded plastic parts.

14. The rotor hub (10) according to any one of the preceding claims, wherein the two rotor hub parts (1) are configured to extend along the full width of the gas sorption rotor (101), when connected.

15. A rotor assembly (100) comprising a gas sorption rotor (101) and the rotor hub (10) according to any one of the claims 1 to 14.

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