Constructional arrangement introduced in a cube for a fan propeller assembly

Abstract

Constructive arrangement introduced in a cube for a fan propeller assembly. The present utility model refers to a cube (120) for a fan propeller assembly (100), wherein said cube (120) comprises a housing channel (130) provided with relief zones (131) alternating with interference zones (132). Said housing channel (130) is also provided with a stop (140) at one of its ends.

Description

1 / 8 CONSTRUCTIONAL ARRANGEMENT INTRODUCED IN A CUBE FOR A FAN PROPELLER ASSEMBLY Field of application

[001] The present utility model pertains to the field of ventilation apparatus and devices and their respective parts or accessories. Introduction

[002] The present utility model refers to a constructive arrangement introduced in a cube for a fan propeller assembly.

[003] A fan propeller, according to the present utility model, is characterized by having a hub comprising a central housing channel with alternating relief zones and interference zones for accommodating and securing the motor shaft that drives the propeller assembly. The channel of said hub also comprises a stop at one of its ends. State of the art

[004] Various fan configurations and respective propellers of the nature described above are known in the state of the art.

[005] An example is the solution disclosed by patent document BR 102015030423-4 which refers to a “Quick fastening system for fan propellers”. Said patent document deals with a quick fastening system for fan propellers comprising a symmetrically shaped spring housing, a fastening spring and a rotation shaft provided with a propeller coupling end comprising a spring latch and two keys (as contained in the abstract of the patent document). Petition 870200104230, dated 08 / 19 / 2020, p. 10 / 25 2 / 8

[006] As can be deduced from patent document BR 102015030423-4, the arrangement disclosed therein requires a set of elements for attaching the propeller to the motor shaft, in which the spring-functioning part and its interaction with the end of the motor shaft stand out. Said motor shaft has a guide and keys to properly couple the said spring. It is easily noticeable that this construction requires greater manufacturing complexity and does not offer a practical solution for the end user, since the user may have problems when uncoupling the propeller from the motor shaft. Furthermore, this solution is not robust since these keys and the spring, when locked, may require excessive force from the end user in an attempt to disassemble the device, which may damage or deform them.

[007] Other state-of-the-art devices are those presented in patent documents US 3264016, PI 0502971, CN 209604282, CN 201546983 and EP 2799719. However, these solutions continue to exhibit as their main problems either the requirement for a more sophisticated, and often more fragile and expensive, apparatus to attach the propeller to the shaft; or the inefficiency of simpler, and consequently less expensive, arrangements in coupling the propeller without any element to ensure its proper and secure attachment.

[008] As for the more sophisticated solutions, they usually depend on accessory parts such as springs, latches and buttons, which are susceptible to breakage and result in higher manufacturing costs. As for the simpler solutions, it is common to find that they have the added disadvantage of making it difficult to remove the elements due to the formation of a vacuum between two parts, given the absence of a clearance or relief. Petition 870200104230, dated 08 / 19 / 2020, page 11 / 25 3 / 8

[009] There is therefore room for a constructive arrangement introduced in a fan propeller assembly integrating the following characteristics: a) simple and low-cost construction; b) secure coupling and fastening between the fan propeller and motor shaft; and c) practicality for the end user. Utility model objective

[010] The objective of the present utility model is, therefore, to provide a hub for a fan propeller assembly provided with a channel with relief zones and interference zones, interspersed with each other, for accommodating and fixing the motor shaft, and a stop for delimiting the shaft's travel inside the channel. Brief description of the figures

[011] For better understanding and visualization of the object of the present utility model, it will now be described with reference to the attached figures, representing the functional improvement obtained, in which, schematically: Figure 1: shows a front view of a fan propeller assembly according to the utility model; Figure 2a: shows a partial front view of the hub housing channel according to the utility model; Figure 2b: shows a partial rear view of the fan propeller hub housing channel according to the utility model; Petition 870200104230, dated 08 / 19 / 2020, p. 12 / 25 4 / 8 Figure 2c: shows an enlarged view of detail C of the fan propeller hub housing channel from Figure 2b; Figure 3: shows a cross-sectional view AA of the fan propeller hub from Figure 1; Figure 4a: shows a cross-sectional view BB of the fan propeller hub from Figure 1; Figure 4b: shows an enlarged view of detail D of the stop and housing channel of the fan propeller hub from Figure 4a; Figure 5: shows a rear perspective view of the fan propeller hub housing channel according to the utility model; and Figure 6: shows a rear view of the hub housing channel with the motor shaft according to the utility model. Numerical references for the figures 100 fan blades; 110 blades; 120 cube; 130 hosting channels; 131 relief zone; 132 interference zone; 140 doorstop; 200 motor shaft; 0c diameter of the housing channel; Petition 870200104230, dated 08 / 19 / 2020, p. 13 / 25 5 / 8 0e motor shaft diameter; p depth of the relief zone; dl distance between the wall of the housing channel and the edge of the stop; and d2 distance between the stop and the front opening of the housing channel. Detailed description of the utility model

[012] The fan propeller (100) according to the utility model, or just propeller (l00), comprises a set of blades (ll0) and a hub (l20), in the center of which is a housing channel or just channel (130).

[013] In order to better visualize the housing channel (130) of the fan propeller hub (120), said propeller (100) is shown in cross-section in Figures 3 and 4a.

[014] The housing channel (130) is concentric to the hub (120) and is open both at its rear and at its front. Inside the housing channel (130) are arranged relief zones (131) and interference zones (132), symmetrically interleaved, and, at one of its ends, a stop (140).

[015] Note that channel (130) is intended to house a motor shaft (200), or just shaft (200), of a fan motor (not shown) that drives the assembly, as already known in the state of the art.

[016] The present utility model provides that the channel (130) has an equal number of relief zones (131) and interference zones (132) within it, since these relief zones (131) and interference zones (132) alternate equidistantly. Said channel (130) has a starting shape Petition 870200104230, dated 08 / 19 / 2020, p. 14 / 25 6 / 8 substantially cylindrical, compatible with a known shape of fan motor shaft (200). The arrangement of relief zones (131) and interference zones (132) inside the channel (130) gives the profile of its internal diameter (0c) a polygonal shape. The number of edges of this internal polygon is proportional to the number of relief zones (131) or interference zones (132), more precisely, the number of edges is equal to the number of relief zones (131) or interference zones (132).

[017] The present utility model provides that the fan motor shaft (200) enters the channel (130) from its rear portion. To this end, the diameter (0e) of the shaft (200) and the diameter (0c) of the channel (130) are corresponding, in a manner already known in the state of the art. By corresponding, it is understood that the diameter (0e) of the shaft (200) and the diameter (0c) of the channel (130) have similar measurements, with the diameter (0e) of the shaft (200) being smaller than the diameter (0c) of the channel (130) in their interference zones (132), within tolerance values ​​known to one skilled in the art. Once inserted, the shaft (200) encounters, at the end of the channel (130), the stop (140) which prevents unwanted movement of the shaft (200) and imposes longitudinal (axial) translational limitation on its travel.

[018] For this purpose, the distance (d1) between the inner wall of the channel (130) and the edge of the stop (140), according to the present utility model, must correspond to a value between 20% and 40%, preferably between 25% and 35% of the diameter (0c) of the channel (130). In turn, the distance (d2) between the stop (140) and the front opening of the channel (130) must correspond to a value between 10% and 25%, preferably between 15% and 20% of the length of the channel (130). Petition 870200104230, dated 08 / 19 / 2020, page 15 / 25 7 / 8

[019] The presence of relief zones (131) and interference zones (132) on the inner walls of the channel (130) allows the shaft (200) to be inserted and removed with relative ease and, after insertion, to remain firmly located inside the channel (130).

[020] Relief zones (131) extend longitudinally along the entire length of the channel (130), reducing the contact surface between the shaft (200) and the hub (120), preventing the formation of a vacuum between the channel (130) and the shaft (200), facilitating its assembly and disassembly. Conversely, interference zones (132) prevent unwanted rotational (radial) movement of the shaft (200) relative to the hub (120), since they constitute friction zones between the walls of the channel (130) and the motor shaft (200).

[021] It should be noted that the interference zones (132) eliminate the need for guides, locks or keys to keep the shaft firmly seated inside the channel (130) of the propeller (100). Consequently, they also prevent the shaft (200) from coming loose or the speed phase difference between the shaft (200) and the propeller (100).

[022] The alternation of relief zones (131) with interference zones (132) ensures proper fixation of the shaft (200) while also providing easy handling of the propeller (100) during assembly or disassembly. The present utility model provides that the depth (p) of the relief zones (131) should correspond to a value between 1.75% and 7%, preferably between 2.5% and 5% of the diameter (0c) of the channel (130).

[023] Furthermore, the fan propeller (100) according to the present utility model eliminates the need for additional accessories, springs, clips, covers, tabs and other elements that are necessary in other state-of-the-art solutions. Thus, it further reduces the manufacturing cost and makes its Petition 870200104230, dated 08 / 19 / 2020, page 16 / 25 8 / 8 construction is even simpler. This obviously translates into ease of assembly and disassembly for the end user. Final considerations

[024] It is evident that the measurements and relationships between measurements described for the present constructive arrangement may vary according to the dimensioning of the fan propeller (100).

[025] Exhaustive practical tests, however, have shown that the aforementioned dimensions and their relationships are highly efficient and effective in the assembly and reliability provided by the fan propeller.

[026] Furthermore, the constructive arrangement of the present utility model and the aforementioned measurements and their relationships are highly reliable and reproducible. Conclusion

[027] As can be inferred from the description above, the constructive arrangement according to the present utility model surpasses the solutions of the state of the art, being an object of practical use, perfectly susceptible to industrial application, which presents a new arrangement, involving an inventive act and resulting in functional improvement in its use. Petition 870200104230, dated 08 / 19 / 2020, p. 17 / 25

Claims

1 / 1 CLAIMS 1. Constructive arrangement introduced in a hub for a fan propeller assembly, characterized in that the hub (120) is provided with a housing channel (130) provided with relief zones (131) alternating with interference zones (132), wherein the housing channel (130) is provided with a stop (140) at one of its ends.

2. Constructive arrangement introduced in a cube for a fan propeller assembly, according to claim 1, characterized in that the depth (p) of the relief zones (131) corresponds to a value between 1.75% and 7%, preferably between 2.5% and 5% of the diameter (0c) of the channel (130). Petition 870200104230, dated 19 / 08 / 2020, p. 18 / 25

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