Helico centrifugal fan

Abstract

 A helico centrifugal fan formed by a structural assembly comprising an air passage duct formed by an air convergence cone (2) and an air divergence cone (3) inside a tubular casing (1), which are axially separated, there being a silencer (7) between them arranged between the narrowest parts thereof.

Description

Field of the Art

[0001] The present invention relates to air driving means used in ventilation systems, proposing a helico centrifugal tubular fan intended for being intercalated in an air duct, with structural features determining an advantageous embodiment of soundproofing.

State of the Art

[0002] In both domestic and industrial ventilation systems, it is important to prevent the noise which the fans produce when operating from propagating through the structures supporting the system, which is conventionally solved by arranging the fans with soundproofing solutions.

[0003] On the other hand, axial tubular fans are known which are intercalated in air circulation ducts, the body of these fans formed by a cylindrical casing in which an air driving element and the operating elements for the operation thereof are housed, said casing being connected by its ends to an air circulation duct.

[0004] With this such fans high air driving performance for ventilation is achieved, particularly with those having a helico centrifugal propeller, but the installation assembly of these fans intercalated in air ducts favors the transmission of the noise of the operation through said air circulation ducts.

[0005] To solve this problem, the conventional solution that is adopted is to arrange independent silencers of the fan itself, which silencers are incorporated on the sections of the air duct to which the fan is connected or intercalated between said sections of the air duct and the fan, in front of and behind the fan, which determines a considerable longitudinal extension of the fan, said extension further being determined by the diameter of the air duct in which the fan is arranged since a longer length of the silencers is required the larger the diameter of the duct.

Object of the Invention

[0006] A helico centrifugal fan is proposed according to the invention, developed with structural features determining an advantageous soundproofing arrangement with respect to conventional embodiments.

[0007] This fan object of the invention comprises a structural assembly formed by an air convergence cone and an air divergence cone which determine connections for connecting to air ducts, an air driving propeller associated with a drive motor being included in the air divergence cone, whereas a silencer is intercalated between the two cones determining an intermediate conduit between both.

[0008] A fan is thus obtained which is suitably soundproofed with a reduced longitudinal dimension, since the silencer arranged between the structural cones has a smaller diameter than the outer openings of said cones and therefore it requires less length in comparison with the silencers arranged in extension of said outer openings in conventional fans.

[0009] The silencer arranged between the structural cones of the fan can further be determined with an extension onto one or both structural cones, whereby achieving an even greater soundproofing effect with the same fan longitudinal dimension.

[0010] The possibility of incorporating a complimentary silencer with respect to the outer opening of the air divergence cone of the fan is also provided, said silencer being formed by two concentric cylindrical bodies, assembled on the structural casing itself in that output part of the fan, whereby further increasing the soundproofing of the fan without increasing the longitudinal dimension thereof.

[0011] Therefore, said fan object of the invention has very advantageous constructive and functional features, acquiring its own identity and preferable character with respect to conventional fans of the same type.

Description of the Drawings

[0012] 

Figure 1 schematically shows a conventional type soundproofed helico centrifugal fan.

Figure 2 is a scheme of a soundproofed helico centrifugal fan according to the invention.

Figure 3 is an exploded perspective view of a practical embodiment of a soundproofed helico centrifugal fan according to the invention.

Figures 4, 5 and 6 schematically show a soundproofed helico centrifugal fan according to the invention, according to three enlarged embodiments of the silencer arranged between the air convergence cone and the air divergence cone of the fan.

Figure 7 is a scheme of a soundproofed helico centrifugal fan according to the invention, incorporating a complimentary silencer in the outlet part of the fan.

Figure 8 is an exploded perspective view of a practical embodiment of a soundproofed helico centrifugal fan like that of the preceding figure.

Detailed Description of the Invention

[0013] The object of the invention relates to a helico centrifugal fan of the type comprising a tubular casing (1), inside which there is housed a structural assembly made up of an air convergence cone (2) and an air divergence cone (3), which determine an air passage duct, an air driving propeller (4) associated with a drive motor (5) being housed in the air divergence cone (3), all of this forming an assembly intended for being intercalated in an air duct, to which the ends of the tubular casing (1) are coupled.

[0014] Conventional fans of this type are complimented with silencers (6) arranged in extension of the ends, as observed in Figure 1, for preventing the operating noise from propagating through the application air duct, said silencers (6) necessarily having a length proportional to the diameter of the air duct in which the fan is arranged, which generally means that the has an excessive longitudinal dimension.

[0015] The helico centrifugal fan proposed according the invention is formed with the air convergence cone (2) and the air divergence cone (3) axially separated, including a silencer (7) between them arranged between the narrowest parts thereof, as observed in Figure 2.

[0016] The silencer (7) is thus included inside the fan assembly, in an area of smaller diameter than the coupling ends for being coupled to the application air duct, so said silencer (7) requires a much short length than the silencers (6) arranged in extension of the end of conventional helico centrifugal fans do.

[0017] In that arrangement, the soundproofing silencer (7) according to this solution of the invention, can be arranged such that it extends onto the air convergence cone (2) of the fan, as shown in Figure 4, or onto the air divergence cone (3), as shown in Figure 5, or onto both cones (2 and 3), as shown in Figure 6, a greater soundproofing effect with the same total length of the fan being achieved with these forms.

[0018] In addition, the possibility of incorporating a complimentary silencer (8) at the outlet of the fan assembled on the tubular casing (1) is provided, said complimentary silencer (8) comprising two concentric cylindrical bodies (8.1 and 8.2), which are in correspondence outside and inside the air passage, whereby increasing the soundproofing of the fan maintaining its structural longitudinal dimension.

Claims

1. A helico centrifugal fan formed by a structural assembly comprising an air convergence cone (2) and an air divergence cone (3) inside a tubular casing (1), between which cones there is an air passage duct, there being a propeller (4) in the air divergence cone (3) associated with a drive motor (5), characterized in that the air convergence cone (2) and the air divergence cone (3) are axially separated, there being a silencer (7) between them arranged between the narrowest parts thereof.

2. The helico centrifugal fan according to claim 1, characterized in that the silencer (7) extends onto the air convergence cone (2).

3. The helico centrifugal fan according to claim 1, characterized in that the silencer (7) extends onto the air divergence cone (3).

4. The helico centrifugal fan according to claim 1, characterized in that the silencer (7) extends onto the air convergence cone (2) and onto the air divergence cone (3).

Drawing