EP2899406A1 - Cooling module with sound insulated blower - Google Patents

Abstract

Disclosed is a cooling module or cooling unit with a housing and with a radial fan, which serves as a fan for a radiator. The housing has a sound absorber formed from an aluminum sheet absorber, which has a plurality of micro-slots. With the absorber inner walls of the housing are completely or partially lined, whereby spaces between the inner wall and the absorber are formed, which are divided by honeycomb or lattice-shaped partitions in chambers. The chambers are thus connected only through the micro slots with the interior of the housing and insulate the sound of the Radialzuffterrads. Alternatively, the outer housing wall may be formed by an absorber having a plurality of micro-slots.

Description

The invention relates to a cooling module or a cooling unit according to the preamble of patent claim 1.

Such cooling modules have a fan wheel, via which ambient air is conveyed through a cooler of the cooling module. In this case, a coolant, which was previously used away from the cooling module for cooling, recycled in a circuit to the radiator and cooled therein again. Then the coolant can be used again for cooling.

Such cooling modules are mounted, for example, on roofs of rail vehicles in which people are located. Then the coolant is conveyed into the components of the rail vehicle to be cooled. A disadvantage of such cooling modules is that disturbing noises of the fan can be reinforced via the housing of the cooling module and transmitted to the interior and the environment.

From the prior art it is known to line the housing for sound insulation with foams or fibrous materials. A disadvantage of such sound insulation is that they absorb dust as well as rain or condensation water or leaked cooling fluid, whereby their durability is reduced. In particular, such sound insulation can be damaged after exposure to liquids at temperatures below freezing.

In contrast, the invention is based on the object to provide a cooling module, in which these disadvantages are avoided.

This object is achieved by a cooling module having the features of patent claim 1.

The claimed cooling module has a housing and a rotating fan wheel (for example, paddle wheel). For sound insulation, at least one wall section of the housing has, according to the invention, a plurality of chambers, which are delimited at least on the inside by a micro-perforated absorber extending over a plurality of chambers and furthermore by partitions arranged in the interior of the wall section. The micro-perforated absorber has a multiplicity of comparatively small through-holes. The chambers are separated by the partitions. Thus, a cooling module is created in which the durability of the soundproofing is improved. In particular, such sound insulation after exposure to dust and liquid (water or coolant) and temperatures below freezing can be resisted and cleaned. Under wall section is also a bottom or a lid of the housing to understand.

Preferably, the passage recesses have a proportion of an area of the absorber of a few percent (in particular less than 8 percent).

For manufacturing reasons, it is preferred if the passage openings are micro slots.

Preferably, the wall portion comprises an outer sheet wall member or wall surface and an inner sheet wall member or wall surface. The micro-perforated absorber forms at least the inner wall element or the inner wall surface.

In a first development of the invention, the outer wall element of the wall section is closed. Thus, the chambers are bounded on the inside by the absorber and on the outside by a sound-reflecting wall element. By choosing the distance between the outer closed wall element and the inner micro-perforated wall element, the sound insulation can be adapted to the sound frequency to be insulated.

Depending on the possible effort and desired sound insulation, individual or all wall sections of the housing can be lined inside with the absorber and provided with the chambers for sound insulation.

In a second development of the invention, the outer wall element of the wall section is formed by an absorber. Thus, the chambers are on the outside and inside of absorbers and further limited by the partitions. Thus, the outer sound system boundary of the cooling module is formed by micro-perforated absorber. By choosing the distance between the outer micro-perforated wall element and the inner micro-perforated wall element, the sound insulation can be adapted to the sound frequency of the cooling module to be insulated.

The sound insulation is further improved if the wall section has one or more central planar wall elements or middle wall surfaces. Thus, two or more levels of chambers are formed in the wall portion. Here too, the distances between the various wall elements (inner, middle and outer wall element) can also be dimensioned differently and thus adapted to the sound frequency to be insulated.

The planes thus formed may have different thickness and thus chamber depth.

Device technology and manufacturing technology is simple, when the partitions between the wall elements and are arranged perpendicular to the wall elements.

The partitions may form a polygonal honeycomb structure according to a first embodiment.

The partitions may form a rectangular or square grid structure according to a second embodiment.

Preferably, the partitions are firmly connected to the sheet-like wall elements. For this they can be glued, welded, soldered or elastic sealing between the Be clamped wall elements. This prevents an acoustic "short circuit" between the partitions.

In a particularly preferred embodiment, the housing has a frame structure, so that there is a box-like structure of the housing. Then, the at least one invention provided with chambers wall portion is inserted into a frame of this frame structure and / or attached to pins of the frame structure. This results in the possibility of easy to manufacture the wall section as a planar sheet-like part to attach to the frame structure, for example by inserting between profiles of the frame structure and / or by attaching to pins.

In particular, in the case of the box-like housing, it is preferred in terms of efficiency optimization when the fan forms a radial fan, which sucks the ambient air axially via a radiator and radially dissipates. The fan can also form an axial fan.

In particular, in the case of the radial fan further micro-perforated absorber elements can be arranged for further sound insulation on the circumference of the fan wheel, which have a specific angular and radial distance to the fan. The further absorber elements can be arranged in one or more rows. The other absorber elements can have air-conducting function.

The wall section or further absorber foils designed according to the invention with absorber and chambers can be arranged parallel or along an air flow.

The absorber can be made of metal (for example, sheet metal).

The absorber can be made of plastic.

The absorber may be in one piece over a certain surface area and thereby form a plurality of inner planar wall elements and have abutment sections arranged therebetween. The abutment sections serve to abut and attach the absorber to or on the outer wall element (s). So is the absorber in the chosen distance to the outer wall element, whereby the depth of the chambers is determined.

It is particularly preferred if the absorber is formed from a sheet and has a plurality of parallel bending points. Then two mutually adjacent bending points in pairs limit a contact portion or an outer wall element. Thus, the curved inner wall element and the flat outer wall element can form spaces which are each divided by the partitions into a plurality of chambers.

The cooling module may have a further fan wheel, wherein one or more wall sections according to the invention (also) are arranged between them.

The housing may have or limit a blow-out channel, which is arranged in the flow direction of the air flow behind the fan. Then (also) the exhaust duct for soundproofing have a wall section according to the invention.

The housing may include or limit an intake passage, which is arranged in the flow direction of the air flow in front of the fan. Then, the intake duct (also) for soundproofing may have a wall section according to the invention.

To maximize the effectiveness of the absorber, the size of the chambers can be designed as a function of a blade airfoil frequency of the rotating fan wheel to be insulated. The blade frequency can be determined from the primary rotational frequency (for example, nominal rotational frequency) of the fan and the number of blades of the fan. The blade leaf frequency can be 440 Hz in one application.

The size of the chambers is defined by the distance between the wall sections to each other and the distance between the partitions.

In a preferred embodiment, the cooling module according to the invention has carriers which are designed to fasten the cooling module to a roof, in particular a rail vehicle.

• Figur 1 ein erstes Ausführungsbeispiel des erfindungsgemäßen Kühlmoduls in einer perspektivischen Ansicht,
• Figur 2 das erste Ausführungsbeispiel des erfindungsgemäßen Kühlmoduls in einer teilweise geschnittenen seitlichen Ansicht,
• Figuren 3a und 3b jeweils ein Ausführungsbeispiel von Trennwänden und Kammern,
• Figur 4 ein zweites Ausführungsbeispiel des erfindungsgemäßen Kühlmoduls in einer teilweise geschnittenen Ansicht,
• Figur 5 ein Gehäuse eines dritten Ausführungsbeispiels des erfindungsgemäßen Kühlmoduls in einer schematischen perspektivischen Ansicht,
• Figuren 6a und 6b einen Wandabschnitt des dritten Ausführungsbeispiels gemäß Figur 5, und
• Figur 7 das dritte Ausführungsbeispiel des Kühlmodul gemäß den Figuren 5 und 6 in einer schematischen geschnittenen seitlichen Ansicht.

In the following two embodiments of the invention will be described in detail with reference to the figures. Show it:

• FIG. 1 A first embodiment of the cooling module according to the invention in a perspective view,
• FIG. 2 the first embodiment of the cooling module according to the invention in a partially sectioned side view,
• FIGS. 3a and 3b one embodiment of partitions and chambers,
• FIG. 4 A second embodiment of the cooling module according to the invention in a partially sectioned view,
• FIG. 5 a housing of a third embodiment of the cooling module according to the invention in a schematic perspective view,
• Figures 6a and 6b a wall portion of the third embodiment according to FIG. 5 , and
• FIG. 7 the third embodiment of the cooling module according to the FIGS. 5 and 6 in a schematic sectional side view.

FIG. 1 shows a first embodiment of the cooling module according to the invention in a perspective view. It has two cross beams 1 which are mounted transversely to the direction of travel on a roof of a rail vehicle (both not shown). The cross member 1 carry a radiator 2, an intermediate housing 4 and a Lüfterradgehäuse 6 with a blow-out 10th

During operation of the cooling module according to the invention, coolant is passed through the radiator 2 via a coolant pump 8 and from there into an interior space of the rail vehicle (both not shown). At the same time, a radial fan wheel (cf. FIG. 2) arranged in the interior of the fan wheel housing 6 is used. FIG. 2 ) Ambient air through the Cooler 2 and sucked through the intermediate housing 4 in the Lüfterradgehäuse 6. The radial fan is driven by an electric motor 16. From the Lüfterradgehäuse 6, the ambient air is discharged through the blow-out channel 10 formed thereon to the environment. Thus, the ambient air, after which it has absorbed heat in the radiator 2 of the supplied coolant, passed through a housing of the cooling module, which consists essentially of the intermediate housing 4, the Lüfterradgehäuse 6 and the exhaust duct 10.

FIG. 2 shows the cooling module according to FIG. 1 in a partially sectioned side view. In particular, a section through the fan wheel housing 6 is shown extending beyond the coolant pump 8 and the two cross members 1 shown in cross section. In the Lüfterradgehäuse 6, the radial fan 12 is disposed adjacent to a wall portion 14 of the Lüfterradgehäuses 6. The ambient air flows axially through the radial fan 12 and leaves it radially.

The wall portion 14 is formed integrally with a wall portion of the blow-out channel 10. Furthermore, a cover 20 and a bottom 22 of the Lüfterradgehäuses 6 are shown, wherein the bottom 22 is integrally formed with an angled bottom 24 of the Ausblaskanals 10.

On the cover 20 of the Lüfterradgehäuses 6 and on the common wall portion 14 of the Lüfterradgehäuses 6 and the Ausblaskanals 10 and at the bottom 24 of the Ausblaskanals 10 each have a micro-perforated absorber 28 is fixed, the absorber 28 of the lid 20 and the bottom 24 cut are shown, while the absorber 28 of the wall portion 14 is shown in a view. The absorbers 28 are made of aluminum sheet and are angled several times according to a regular scheme. Due to the bends, each absorber 28 has strip-shaped abutment sections 30 which are fastened to the fan wheel housing 6 and lie substantially flat on the wall section 14 or on the floor 24 or on the cover 20. Adjacent strip-shaped sections are formed, between each of which a main portion 32 of the absorber 28 is arranged. The main sections 32 are preferably arranged parallel to the wall section 14 or to the bottom 24 or to the cover 20. This results in a plurality of flat spaces 34, which are connected to the interior of the housing 6 only via a plurality of micro slots which penetrate the absorber 28.

FIGS. 3a and 3b each show an embodiment of regular structures of partitions 35; 135, which are placed inside the rooms 34 to separate chambers 36; 136 to form. More specifically, the first embodiment has lattice-like partition walls 35, while the partition walls of the second embodiment are arranged such that honeycomb-like chambers 136 result. In both embodiments, the height of the partition walls 35; 135 and thus the chambers 36; 136 of the height of the spaces 34, which is defined by the distance of the main portions 32 of the absorber 28 from the outer wall portion 14 and from the bottom 24 and the lid 20. This chambers are formed, the size of which is designed as a function of the sound frequency to be damped.

FIG. 4 shows a second embodiment of the cooling module according to the invention in a partially sectioned view. The cooling module has, in addition to the first radiator 2 according to the preceding embodiment, a second radiator 102, which is separated from the inflowing ambient air (in FIG. 4 from left to right) is flowed through before it flows through the first radiator 2, the intermediate housing 4 and the Lüfterradgehäuse 6. Furthermore, the second embodiment has a coolant filter 144.

In FIG. 4 It is shown that the absorbers 28 are fastened via their abutment sections 30 and via rivet nuts 146 to the respective housing 4, 6. For this purpose, the riveting nuts 146 penetrate the walls and bottoms and ceilings of the housings 4, 6. Some wall sections of the housings 4, 6 have on their inside the absorbers 28, through which the spaces 34 are formed, into the grid-like or honeycomb-like regular structures according to the invention are fitted from partitions for chamber formation.

FIG. 5 shows a housing 206 of a third embodiment of the cooling module according to the invention in a schematic perspective view. It is designed as a frame construction and has profiles 248 along its edges. In the areas between the profiles 248, in each case a flat fitting wall section 214 is inserted.

Figures 6a and 6b a wall portion 214 of the third embodiment according to FIG. 4 , More specifically shows FIG. 6a the wall section in a perspective view, During FIG. 6b shows the wall portion 214 in a side sectional view. The wall sections are formed from three flat wall elements of micro-perforated absorbers 28, ie of an inner wall element 250, a central wall element 252 and an outer wall element 254. In between two levels or spaces 34 are formed, in which partitions 35; 135 and chambers 36; 136 (for example, according to one of the embodiments according to the FIGS. 3a or 3b ) are arranged.

The partitions 25; 135 are attached to the wall elements 250, 252, 254 so that the chambers 36; 136 are airtight except for the perforations made as micro-slots.

The outer wall element 254 has holes 256, over which it is attached to pins 258 of the profiles 248.

FIG. 7 shows the third embodiment of the cooling module according to the FIGS. 5 and 6 in a schematic sectional view. It is illustrated that the radial fan 12 conveys the ambient air radially outward. In this case, a portion of the ambient air penetrates according to the arrows through the micro slots of three additional distributed on the circumference of the radial fan 12 absorber elements 218 and three wall elements 250, 252, 254. The much larger part of the ambient air through the blow-out 10 (see FIG. 1 ) promoted to the outside.

Disclosed is a cooling module or cooling unit with a housing and with a radial fan, which serves as a fan for a radiator. The housing has a sound absorber formed from an aluminum sheet absorber, which has a plurality of micro-slots. With the absorber inner walls of the housing are completely or partially lined, whereby spaces between the inner wall and the absorber are formed, which are divided by honeycomb or lattice-shaped partitions in chambers. The chambers are thus connected only through the micro slots with the interior of the housing and insulate the sound of the Radialzuffterrads. Alternatively, the outer housing wall may be formed by an absorber having a plurality of micro-slots.

LIST OF REFERENCE NUMBERS

1

crossbeam

2; 102

cooler

4

intermediate housing

6

fan case

8th

Coolant pump

10

blow-out

12

radial fan

14; 214

wall section

16

electric motor

20

cover

22

ground

24

ground

28

absorber

30

contact section

32

main section

34

room

35; 135

partition wall

36; 136

chamber

40

cover

144

Coolant Filter

146

rivet nut

206

casing

218

absorber element

248

profile

250

inner wall element

252

middle wall element

254

outer wall element

256

hole

258

pen

Claims (16)

Cooling module with a fan wheel (12) and with a housing (4, 6, 10, 206), wherein for sound insulation at least one wall section (14, 20, 24, 40, 214) of the housing (4, 6, 10, 206) chambers (36; 136) bounded by a micro-perforated absorber (28) extending across a plurality of chambers (36; 136) and partitions (35; 135), the micro-perforated absorber (28) having a plurality of has comparatively small passage recesses, and wherein the chambers (36; 136) are separated from each other by the partitions (35; 135). The cooling module of claim 1, wherein the wall portion (14, 20, 24, 40; 214) comprises an outer sheet wall member (254) and an inner sheet wall member (250), and wherein the micro-perforated absorber (28) covers the inner wall member (25). 250). Cooling module according to claim 2, wherein the outer wall element is closed. The cooling module of claim 2, wherein the outer wall member (254) is formed by a micro-perforated absorber (28). Cooling module according to one of claims 2 to 4, wherein the wall portion (214) has one or more central sheet-like wall elements (252). Cooling module according to one of claims 2 to 5, wherein the partition walls (35; 135) between the wall elements (250, 252, 254) and are arranged perpendicular thereto. Cooling module according to one of the preceding claims, wherein the partition walls (35; 135) form a honeycomb structure or a lattice structure. Cooling module according to one of claims 2 to 7, wherein the partitions (35; 135) are fixedly connected to the wall elements (250, 252, 254). Cooling module according to one of the preceding claims, wherein the housing (206) has a frame structure, in which the wall portion (214) is inserted. Cooling module according to one of the preceding claims, wherein the fan wheel (12) forms a radial fan. Cooling module according to claim 10, wherein on the circumference of the fan wheel (12) further micro-perforated absorber elements (218) are arranged, which have a specific angular and radial distance from the fan wheel (12). Cooling module according to one of the preceding claims, wherein the wall portion (14, 20, 24, 40, 214) is arranged parallel to an air flow. Cooling module according to one of the preceding claims, wherein the absorber (28) is made of metal or plastic. Cooling module according to one of the preceding claims, wherein the absorber (28) is in one piece, and wherein the absorber (28) forms a plurality of main sections (32) of inner planar wall elements and between them analagic sections (30) for engagement with the outer wall element (s). having. Cooling module according to claim 14, wherein the absorber (28) is formed from a sheet and has a plurality of parallel bending points. Cooling module according to one of the preceding claims with a further fan wheel, wherein the wall portion between the fan wheel (12) and the further fan wheel is arranged.

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