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Title:
AIR INLET DUCT FOR A GENSET ENCLOSURE
Document Type and Number:
WIPO Patent Application WO/2010/060482
Kind Code:
A1
Abstract:
An air inlet duct for a genset enclosure comprising: a body having a slot and a front border; and a baffle supported in the body between the slot and the front border, wherein the body and the baffle are arranged in a sound path between a sound source and an inlet to reflect a sound transmitted along the sound path. A method for reducing sound emission in a genset enclosure comprising: providing an air inlet duct having a body with a slot and a front border; positioning a baffle in the body between the slot and the front border; arranging the body and the baffle in a sound path between a sound source and an inlet to reflect a sound transmitted along the sound path.

Inventors:
KELLY GARY S (IE)
Application Number:
PCT/EP2008/066304
Publication Date:
June 03, 2010
Filing Date:
November 27, 2008
Export Citation:
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Assignee:
F G WILSON ENGINEERING LTD (IE)
KELLY GARY S (IE)
International Classes:
F02B63/04; F02B77/13
Foreign References:
JP2002070571A2002-03-08
JP2003020955A2003-01-24
JP2000110579A2000-04-18
JP2001355445A2001-12-26
Attorney, Agent or Firm:
MODIANO, Micaela (Via Meravigli 16, Milano, IT)
Download PDF:
Claims:
CLAIMS

1. An air inlet duct (10) for a genset enclosure (40) comprising: a body (12) having a slot (16) and a front border (31); and a baffle (14) supported in the body (12) between the slot (16) and the front border

(31), wherein the body (12) and the baffle (14) are arranged in a sound path between a sound source and an inlet (44) to reflect a sound transmitted along the sound path.

2. The air inlet duct (10) of claim 1 wherein the air inlet duct (10) is superposed on the inlet (44).

3. The air inlet duct (10) of claims 1 or 2 wherein the longitudinal axes of the baffle (14) and the slot ( 16) are aligned.

4. The air inlet duct (10) of claims 1, 2 or 3 wherein the body (12) comprises mating elements (26) for coupling to corresponding mating elements on a wall (42) of the genset enclosure.

5. The air inlet duct (10) of claim 4 wherein the mating elements (26) are removably coupled to the corresponding mating elements.

6. The air inlet duct (10) of any of the preceding claims wherein the body (12) comprises an inclined end member (22).

7. The air inlet duct (10) of any of the preceding claims wherein the body comprises at least one lip coupled to an internal edge (36).

8. The air inlet duct (10) of any one of the preceding claims wherein the baffle (14) is removably supported.

9. The air inlet duct (10) of any one of the preceding claims wherein the baffle (14) and the slot (16) are centrally positioned on the body (12).

10. A genset enclosure comprising the air inlet duct (10) of any one of the preceding claims.

1 1. A method for reducing sound emission in a genset enclosure comprising: providing an air inlet duct (10) having a body (12) with a slot (16) and a front border (31); positioning a baffle (14) in the body (12) between the slot (16) and the front border (31); arranging the body (12) and the baffle (14) in a sound path between a sound source and an inlet (44) to reflect a sound transmitted along the sound path.

12. The method of claim 1 1, further comprising the step of superposing the air inlet duct (10) on the inlet (44).

13. The method of claims 1 1 or 12 wherein the longitudinal axes of the baffle (14) and the slot ( 16) are aligned.

Description:
AIR INLET DUCT FOR A GENSET ENCLOSURE Technical Field

This disclosure relates generally to enclosures for an engine-generator set. More particularly, the disclosure relates to the attenuation of sound emitted from the enclosure during operation of an engine-generator set. Background

An engine-generator or a genset may be a combination of an engine and a generator.

Both components may be mounted together to form a single machine. A genset may provide electricity at various locations such as construction sites or emergency response sites. Generally, a genset may provide electricity for apartments, office buildings, hotels and hospitals.

A genset may be a small person-portable device or a larger device that may be mounted on a skid or a trailer, depending on the requirements and location, and the amount of power that is needed for a particular use. Often, a genset may be mounted within an enclosure, such as a removable shroud or cover.

Within the enclosure, adequate ventilation and cooling may be required to dissipate heat generated by the genset components for reliable operation of the genset. Generally, heat, from a genset, may be dissipated by natural convection. For instance, heat may be dissipated from an engine mounted radiator which may be cooled by air flowing through a compartment in the enclosure. An air flow may be usually produced by a radiator fan.

Besides heat, noise or sound may be also generated by the engine, by the generator and by the exhaust and it is obviously desirable to keep such sound emissions as low as possible. Local authorities may also set sound regulations, which may include limits on maximum sound emissions. Hence, the sound emission from the genset enclosure may need to be within the maximum sound limits in order to operate legally. The enclosure may block or attenuate sound emanating from the engine or other genset components. In order to provide adequate cooling within the genset enclosure, it may be necessary to provide openings within the enclosure for ventilation. Hence, sound may be emitted through the openings. To reduce sound emission through the openings, the number or size of openings in the compartment may be decreased. However, the air flow may decrease to a level where the cooling effect may be also reduced, resulting in an increase in temperature within the enclosure. This may adversely affect temperature sensitive components, such as alternator, fuel injection system and various electronic components such as microprocessors. A solution may be to increase the air flow by providing a fan which has a high rotational speed. However, the increase in fan speed may result in more noise being produced from the engine compartment.

Sound may also be reduced by lowering the fan speed or lowering engine output. However, such actions may decrease the overall efficiency of the machine. Sound dampers may be used to reduce or avoid the transmission of sound. The genset enclosure may be lined with sound dampers, which may either absorb or reflect the noise.

It is desirable to provide adequate ventilation through a genset enclosure with a minimal emission of sound from the genset enclosure

The present disclosure is directed, at least in part, to improving or overcoming one or more aspects of the prior art system. Brief Summary of the Invention

In a first aspect, the present disclosure describes an air inlet duct for a genset enclosure comprising: a body having a slot and a front border; and a baffle supported in the body between the slot and the front border, wherein the body and the baffle are arranged in a sound path between a sound source and an inlet to reflect a sound transmitted along the sound path.

In a second aspect, the present disclosure describes a method for reducing sound emission in a genset enclosure comprising: providing an air inlet duct having a body with a slot and a front border; positioning a baffle in the body between the slot and the front border; arranging the body and the baffle in a sound path between a sound source and an inlet to reflect a sound transmitted along the sound path.

Other features and advantages of the present disclosure will be apparent from the following description of various embodiments, when read together with the accompanying drawings. Brief Description of the Drawings

The foregoing and other features and advantages of the present disclosure will be more fully understood from the following description of various embodiments, when read together with the accompanying drawings, in which: Fig. 1 is a front isometric view of an air inlet duct according to the present disclosure;

Fig. 2 is a rear isometric view of an air inlet duct according to the present disclosure;

Fig. 3 is an top isometric view of a partially assembled genset enclosure including an air inlet duct according to the present disclosure; and

Fig. 4 is a cross-section of the air inlet duct along the line Al - A2 of Fig.1 mounted to an inlet of a genset enclosure, according to the present disclosure.

Detailed Description

This disclosure generally relates to an air inlet duct for a genset enclosure. The air inlet duct may allow ventilation or air flow through the enclosure and minimise sound emission from genset components. Fig. 1, illustrates an air inlet duct 10 which may comprise a body 12, baffle 14 and a slot 16.

Body 12 may have a base member 18, side members 20 and an end member 22. Base member 18 may have any suitable shape and may have any suitable dimensions to correspond with an inlet of a genset enclosure. In an embodiment, base member 18 may be formed as a rectangle.

Side members 20 may be formed as a trapezium, for instance a right-angled trapezium, and may be connected, through one the parallel edges, to the edges of base member 18. In an embodiment, the longitudinal edges of the base member 18 and the side members 20 may be connected. Side members 20 may be perpendicular relative to the base member 18. Side members 20 may have edges 24 which may be opposite and parallel to the edges connected to the base member 18.

Edges 24 may have mating elements 26. Mating elements 26 may couple to corresponding mating elements in a genset enclosure. In an embodiment, mating elements 26 may be male projections that couple to corresponding female cavities in the genset enclosure. In another embodiment, mating elements 26 may be female cavities that couple to corresponding male projections in the genset enclosure.

End member 22 may be connected, through an edge, to the base member 18. End member 22 may be connected to the side members 20 through opposite edges, both of which may be adjacent to the edge connected to base member 18. The end member 18 may be connected to the slanting edges of the side members 20. End member 18 may have a free edge 28 and may be oblique relative to the base member 18. In an embodiment, end member 22 may be inclined in a direction away from the base member 18. End member 22 may be formed as a rectangle.

Opposite end member 22, the body 12 may have an end border 30. End border 30 may be formed by end edges of the base member 18 and the side members 20. Adjacent end border 30 may be a front border 31. Front border 31 may be foπned by the edges 24 of the side member 20 and free edge 28 of the end member 22. In an embodiment, Front border 31 may be formed by the mating elements 26 of the side member 20 and free edge 28 of the end member 22. Body 12 may further have a channel 32. Channel 32 may be formed by surfaces of the base member 18, the side members 20 and the end member 22. Depth of channel 32 may be equal to the width of the side member 20. In an embodiment, the depth of the channel 32 may be uniform along the base member 18, and may be the length between edge 24 and the surface of base member 18. The depth of the channel 32 may be decrease along the end member 22 between the edge connecting to the base member 18 and the free edge 28, and may be the length between edge 24 and the surface of end member 22.

Baffle 14 may be positioned within channel 32. In an embodiment, baffle 14 may be centrally positioned in the channel 32 such that the longitudinal axes of the base member 18 and the baffle 14 may be aligned. Baffle 14 may be equidistant from side members 20. Baffle 14 may be supported in the channel 32 by a bracket 34 extending from a surface of the base member 18, the side members 20 or the end member 22. In an embodiment, the baffle 14 may be supported by two brackets 34. In another embodiment, brackets 34 extend from base member 18. Brackets 34 may be mounted to a surface of the channel 34 and baffle 14 by mechanical coupling or chemical bonding. Brackets 34 may mounted to opposite ends of baffle 14. Baffle 14 may be formed as a rectangle. In an embodiment baffle 14 may be have a hollow structure. Baffle 14 may have a length corresponding to the length of base member

18. In an embodiment, length of baffle 14 may be less than the length of the base member 18.

At an end, baffle 14 may not extend beyond border 30. At the opposite end baffle 14 may not extend beyond the junction between body member 18 and end member 22.

Body 12 and baffle 14 may be formed with suitable materials. In an embodiment, body 12 and baffle 14 may be foπned with steel, for instance marine steel.

With reference to Fig. 2, base member 18 may carry the slot 16. Slot 16 may be defined by internal edges 36 of base member 18. In an embodiment, slot 16 may be centrally positioned on the base member 18 such that the longitudinal axes of the base member 18 and the slot 16 may be aligned. Slot 16 may be equidistant from side members 20. Channel 32 may communicate with space beyond base member 18 through slot 16. Between either ends of slot 16 and the opposite edges of base member 18 may be gaps 38. Brackets 34 may be mounted at the gaps 38 within channel 32. Baffle 14 may be positioned between the slot 16 and the front border 31 with the longitudinal axes of the front border 31, the slot 16 and the baffle 14 in parallel.

In another embodiment, the baffle 14 may be offset relative to the slot 16. The baffle 14 may be positioned such that the longitudinal axis of the baffle 14 may be positioned on either side of the longitudinal axis of the slot 16. In this arrangement, either the baffle 14 or the slot 16 may be centrally positioned relative to the base member 18.

Baffle 14 nay be mounted to brackets 34 and may extend over slot 16. The dimension and position of slot 16 may be determined by dimension and position of baffle 14. In an embodiment, dimensions of baffle 14 may be greater than the dimensions of slot 16. Sides of baffle 14 may overlap the internal edges 36 of base member 18 that define slot 16. In an embodiment, a partition may extend from a side of the baffle 14 to the surface of the base member 18. In another embodiment, vanes or strips may be positioned across slot 16 between edges 36. In yet another embodiment, a matrix or a grid may be positioned in the slot 16.

In an embodiment, baffle 14 may be formed as a series of baffles. The baffles may be inclined relative to the slot 16. The baffles may be positioned such that the longitudinal axes may be parallel to the longitudinal axis of the slot 16. The baffles may be positioned such that the longitudinal axes may be perpendicular to the longitudinal axis of the slot 16. The baffles may be mounted over the slot 16 or mounted between internal edges 36.

With reference to Fig. 3 a genset enclosure 40 may comprise an embodiment of the air inlet duct 10. The enclosure 40 may be bound by walls 42. The walls 42 may be of any suitable material and shape as required to contain the genset.

Walls 42 may have at least two openings to permit an airflow through the enclosure 40. A first opening may be an inlet 44 and a second opening may be an outlet 46. Inlet 44 and outlet 46 may allow the interior of the enclosure 40 to communicate with air space external thereto. The openings may allow passage of air into and out of the enclosure 40. The openings may be formed on any wall 42 or may be in any suitable position on the walls 42 of enclosure 40. The openings may include a matrix or a grid of holes to prevent passage of objects larger than the size of the holes.

In an embodiment the inlet 44 and the outlet 46 may be formed on multiple adjacent walls 42, for instance an inlet 44 may be formed in a corner of the enclosure, which may be a junction of three walls 42. The inlet 44 formed on a wall 42 may define a single plane. An inlet 44 formed on multiple adjacent walls 42 may define multiple planes, each plane corresponding to a wall 42.

An air passage 48 may be formed within the interior of the enclosure 40 and may be enclosed by walls 42. Ambient air external the enclosure 40 may enter through inlet 44 flow through the interior of the enclosure 40 along the air passage 48 and may exit through outlet 46.

Air inlet duct 10 may be located within enclosure 40 in the air passage 48. Duct 10 may be positioned over inlet 44. In an embodiment, the front border 31 may form a periphery around the inlet 44 and the baffle 14 in the channel 32 may be between the slot 16 and the inlet 44 of the enclosure 10.

The air inlet duct 10 may be removably or rigidly mounted to a wall 42 at the inlet 44.

In an assembled genset enclosure 40, with mating elements 26 coupled to genset mating elements, front border 31 may abut a wall 42 of the genset enclosure 40. In an embodiment, the front border 31 may form a sealing connection with wall 42. In the assembled genset enclosure 40, border 30 may abut a wall 42 perpendicular to the wall 42 that abuts edges 24 of each side member 20 and the free edge 28 of end member 22. Border 30 may form a sealing connection with said wall 42.

In an assembled genset enclosure 40, channel 32 may communicate with air passage 48.

The enclosure 40 may be divided into portions or sections to receive the genset or components of a genset. The sections or portions may be within the air passage 48 such that air flowing through the air passage 48 flows over the genset positioned within the sections or portions. The gentset may comprise of an engine, a generator and a radiator for transfer of heat to the air flowing through the air passage 48. The genset may comprise a fan, where rotation of the fan may draw air in through the inlet 44 and may force air out of through the outlet 46 thereby driving circulation of the air through the air passage 48.

In an embodiment a section or portion 50 of the enclosure 40 which may receive the engine/generator component may be adjacent to the inlet 44 or the plane of the inlet 44. In another embodiment the engine/generator section or portion 50 may be normal to the inlet 44 or the plane of the inlet 44. In the embodiment where the inlet 44 may be formed on multiple adjacent walls 14 the engine/generator section or portion 50 may be normal to at least one plane of the inlet 44.

A source of sound or noise in enclosure 40 may be components of the genset, for instance the engine and/or generator. Sound produced by engine and/or generator may be transmitted from the engine/ generator portion 50 along a sound path towards the inlet 44 and out to the area external the enclosure 40. The sound path may be a route of sound, for instance a straight-line route, from the source, for instance the engine and/or generator, to a destination, for instance the inlet 44. Sound from the source may also be reflected off a wall 42 and travel towards inlet 44.

An air inlet duct 10 may be positioned in a sound path between the inlet 44 and the engine/ generator 50. The baffle 14 within the air inlet duct 10 may be in the sound path.

Body 12 and baffle 14 may reflect the sound travelling along the sound path. The body 12 and baffle 14 may prevent a direct transmission of sound from the source to the inlet 44. In an embodiment, body 12 and baffle 14 may reflect the sound travelling in the sound path into the channel 32 or into enclosure 40.

With reference to Fig. 4, air inlet duct 10 may further have a lip 52 positioned along an internal edge 36 of the base member 18 that may part define the slot 16. In an embodiment, lips 52 may be mounted to the longitudinal internal edges 36. Each lip 52 may extend along an entire longitudinal internal edge 36. The lips 52 may be mounted by mechanical coupling or by chemical bonding.

In operation, a radiator fan may circulate air through the air passage 48. Ambient air external to the enclosure 40 may flow through inlet 44. Air flow through air inlet duct 10 may be depicted by solid arrows 54. Ambient air entering through inlet 44 may flow into channel 32 of duct 10. Air may flow around baffle 14 and may flow out of channel 32 through slot 16. Air exiting slot 16 may enter air passage 48. Air may flow through the air passage 48 and over a radiator which may transfer heat to the flowing air. Heated air may flow from the radiator through the outlet 46 and out from the enclosure 40.

Sound produced from the engine and/ or generator or reflected of a wall 42 may be transmitted towards the inlet 44. Base member 18 may reflect part of the transmitted sound through the air passage 48 towards inlet 44. Sound may be transmitted through slot 16 and into channel 32. Fig. 4 illustrates the sound entering the channel 32 by arrows with broken lines 56. Baffle 14 may be positioned in the channel 32 between the slot 16 and the inlet 44 of the enclosure 10. Baffle 14 may reflect sound transmitted through slot 16. Sound transmitted beyond the edges of baffle 14 may be reflected by the side members 20. Emission of sound produced by the engine and/ or generator may be restricted by the air inlet duct 10, during operation thereof.

Lips 52 may capture water droplets or other contaminants earned by the air entering channel 32. Captured water droplets may slide along the lips 52 and may land onto end member 22. The inclined end member 22 may allow the water to drain out of the duct 10.

Various surfaces of the air inlet duct 10 may be lined with sound absorbing foam to prevent noise reflecting from the surfaces of the air inlet duct 10 and out through the inlet grill 44. Such surfaces may be side walls 20, base member 18, baffle 14 and end member 22.

The skilled person would realise that foregoing embodiments may be modified or combined to obtain the air inlet duct 10 of the present disclosure Industrial Applicability

This disclosure describes an air inlet duct 10 for controlling sound transmission from a sound source to areas external to the genset enclosure 40 and for controlling entry of contaminants into the enclosure 40. The air inlet duct 10 according to the present disclosure may reflect sound from a source away from an inlet 44 of an enclosure 40. The air inlet duct 10 may reflect sound travelling along a transmission sound path from the sound source to the inlet 44 and may allow ventilation of the enclosure 40 and cooling of the radiator by the air flow through air passage 48. The air inlet duct 10 according to the present disclosure may be suitable for genset enclosures.

The industrial applicability of the air inlet duct 10 as described herein will have been readily appreciated from the foregoing discussion.

Accordingly, this disclosure includes all modifications and equivalents of the subject matter recited in the claims appended hereto as peπnitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the disclosure unless otherwise indicated herein.

Where technical features mentioned in any claim are followed by references signs, the reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, neither the reference signs nor their absence have any limiting effect on the technical features as described above or on the scope of any claim elements.

One skilled in the art will realise the disclosure may be embodied in other specific forms without departing from the disclosure or essential characteristics thereof. The foregoing embodiments are therefore to be considered in all respects illustrative rather than limiting of the disclosure described herein. Scope of the invention is thus indicated by the appended claims, rather than the foregoing description, and all changes that come within the meaning and range of equivalence of the claims are therefore intended to be embraced therein.