DE3024769A1 - LEADING BODY OR AIR CONDUCTOR FOR FLOW MACHINES - Google Patents

Description

Guide bodies or air guide bodies for turbomachines

The invention relates to a guide body or air guide body according to the preamble of the patent claim 1, as it is used for fluid flow machines that work with different fluids can.

Known air deflectors of the type mentioned above have a structure that prevents the formation of an axially continuous current filament. this will achieved for example by a multiple spatial deflection of the flow in the air guide body. The diversion in the radial and in the circumferential direction is carried out by guide ribs that are inserted or inserted into the flow channels are integrally formed on this.

IX / Rp

130064/0173

Deutsche Bank (Munich) Account 5T / 61070

Dresdner Bank (Munich) Account 3939844

Postal check (Munich) account 670-43-804

-Α ΏΕ 0384

The design or the insertion of these guide ribs in the air guide body sets the shape of the Deflection channels narrow limits. In this way, optimal guidance of the flow from the point of view of flow technology can be achieved cannot be implemented or can only be implemented with considerable effort during manufacture or during assembly. Further the guide ribs can not be made double-walled, and connecting openings between the individual Channels are only possible in places that are technically unproblematic. To the well-known air deflector To be able to produce economically, the management of the channels must be as simple as possible, which, however, the efficiency is adversely affected.

It is therefore the object of the invention to create an air guide body which, with low manufacturing costs enables optimal flow guidance and noise damping, and its assembly is greatly simplified.

This task is carried out by the characterizing part

of claim 1 specified features solved.

Because each row of rings consists of a multitude of identical ones

is composed of self-supporting single ducts, 25

the assembly of the air guide body in a simple manner in a radial manner, even with multiple curved individual ducts Direction. Furthermore, only one tool is required for each row of rings during manufacture by injection molding. This tool can be produced more cost-effectively because the molded body to be cast is a closed one Has profile and since its free cross-section are formed by a relatively stable core of the tool can. The demoldability of the molded body is made easier, so that complicated, optimal flow guidance Customized channels can be cast without one too

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to drive large manufacturing costs. The confrontation of these individual channels automatically takes care of the Formation of double-walled ribs, which help to increase the damping effect. The division into Segments, this large number of individual channels is very easy to assemble into a unit and the workload becomes very low.

A particularly favorable embodiment is achieved with the features of subclaims 3 and 4. Through the webs according to the invention creates a cavity between the adjoining walls of the individual channels into which an additional insulating material can be placed, which in the formation of transverse bores in the walls of the Single channels produce an increased effect.

The features of claim 5 lead to a particularly favorable fixation of the flow units, in which the air guide in a simple manner to a pre-fixed assembly unit can be connected. These bundling and centering flanges are also suitable good for a secure coupling to the housing of the turbo machine.

The features of the dependent claims 6 and 7 lead to

a particularly favorable configuration of the walls of the individual channels, so that the assembly of the flow units is simplified significantly. The snap connections 2Q ensure that the air guide body without an auxiliary mounting frame is composable and at the same time receives a higher rigidity.

Further developments result from the other or subclaims.

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Below are based on schematic drawings several embodiments of the invention explained in more detail. Show it:

FIG. 1 shows a longitudinal section through an axially sucking-in radial fan with an upstream according to the invention Air deflector,

FIG. 2 shows a partial section through the air guide body according to FIG. 1 along the line II-II,

FIG. 3 shows a partial view of the air guide body according to FIG. 1 looking in the direction of arrow III,

FIG. 4 is a diagrammatic view of a preassembled row of rings of flow channels of an air guide body according to Figure 1 to 3,

Figure 5 shows a section through the air guide body according to Figure 3 along the line V-V (development),

FIG. 6 shows an enlarged illustration of the detail VI d <

VI of Figure 5 and

FIG. 7 shows a section similar to FIG. 5 through a further embodiment of the air guide body with straight lines Single channels.

η «Figure 1 shows the front end or in the right part the suction side of a radial fan with the impeller 1, the outer housing 2 and the outflow channels 3. An air guide body according to the invention is attached to the outer housing 2 Flanged via a ring stop body 5. The axial

The contact pressure is applied via an inner contact flange 15 upset.

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The front of the

Blower shielded from the outside, whereby by the special Cross-sectional design of the flow channel a slower one Intake flow at the inlet of the air deflector and an accelerated flow, if necessary with pre-swirl at the Exit of the air guide body is effected.

The air deflector is one to the axis of rotation of the impeller . 1 rotationally symmetrical body which has a flow cross section 6 which is curved in an S-shape in the axial direction. the The flow is guided in the form of a horizontal S, and the flow cross-section widens outwards from the inlet cross section 7 of the impeller 1 continuously

,,. outwards in the direction of the inlet cross section 8 of the Air guide body 4. The curvature of the guide surfaces 11 resp. 13 is chosen so that there is a radial overlap of the exit and entry cross-sections of the air guide body. However, air deflectors can also be used,

nn. whose flow cross-sections at the outlet and inlet are the same size and have the same radial dimensions. To prevent the occurrence of axial continuous flow threads, these air guide bodies have essentially radial guide ribs 12 which run obliquely to the axis of the air guide body so that the individual partial inlet and outlet cross-sections are covered.

FIG. 2 shows that in the embodiment according to FIG. 1, too, a deflection in the circumferential direction, ie a 3Q swirl generation of the flow, is effected. The radial or almost radial guide ribs 12 run in such a way that a screw connection of the flow channels 9 in the circumferential direction results _r which is greater than a division 14.

As FIG. 3 shows, the air guide body 4 is set composed of a large number of individual channels 20a or 20b,

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which are bundled to form concentric rows of rings 21a and 21b. All individual channels 20a, b of a row of rings 21a, b are designed identically. In general, the individual channels have a twisted rectangular tube shape. the Side walls 22a, b of the individual channels 20 form the guide ribs 12, the walls running in the circumferential direction 2 3a, b form the outer and inner guide surfaces 10 and 13, respectively, and one essentially parallel to the guide surfaces , «Running rib 16. In this way, within of the air guide body 4 no axially aligned stream filament occur.

The individual channel segments 20a and 20b are designed in such a way, c, that their walls resting against one another support one another, as best shown in FIG. Ring flanges 30 and 31, which are from the outside on the The preassembled flow unit 24 is pushed on and then glued, for example, to fix the individual 2Q segments 20 to form a preassembled unit. In the embodiment According to Figure 1, this task of fixing the ring stop body 5 and the inner pressure flange takes over 15th

In order to increase the damping effect, the mutual support - according to FIG. 5 - can take place via webs 32, which ensure that between the individual walls 22 and 23 of the channels 20 cavities 34 arise. As a result, the channels 20 can be decoupled from one another in terms of vibrations and operate with less noise. Connecting bores 33 in the walls 22 and 23 of the channels 20 ensure that a required flow mechanical Connection of the individual channels 20 is created. The cavity 34 can by means of a suitable insulating material 35 can be isolated.

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An assembly aid consists in the individual

Fixing channels 20 that adjoin one another via a plug connection. Figures 5 and 6 show a c possible embodiment of such a connector in the radial walls 22 of the channels 20. The connector is designed as a snap lock 40, which also has the function to fix the distance of the two adjacent channels 20th Every part of the connector

IQ v / eist a spring ring collar 41 and a for this purpose Groove-ring collar 42, which are plugged into one another, with a profile 43 on the outside of the spring ring collar 41 and on the inside of the groove ring collar 42 interlock with one another. Within the

ir plug connection 40 remains a free space 44 which the Channels 20 are coupled to one another. The groove ring collar 42 also functions as a spacer and ensures that the channels assume a stable position to one another.

2Q Figure 7 shows the same fixation device for the case that the individual channels 20 do not have a radial flow deflection can cause.

When assembling the air guide body 4, it is expedient to proceed so before that you first the innermost flow unit 21b with the insertion of insulating material between the walls of the individual channels and then the other individual channels of the adjacent ones in the radial direction Affiliated flow unit. In addition to or as an alternative to the snap connection, the individual Glue the ducts together to get a compact assembly. The flanges 30 and 31 can also glued on or welded to the individual channels and then clamped to the housing 2. 35

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Claims (8)

Claims 1 / air deflector for noise insulation from fans, - ^ Fans or similar flow machines, with a cross section consisting of at least one concentric Annular row of flow channels is formed by essentially radial and inclined in the axial direction Wall sections are separated from one another, characterized in that each row of rings (21) consists of a plurality of identical preformed individual channels (20) which, with mutual support, form an annularly closed and centered flow unit (24) are bundled. 2. Air guide body according to claim 1, characterized in that with a plurality of flow units (21a, 21b) these are concentric are arranged with respect to one another, their wall sections (23a, 23b) extending in the circumferential direction being supported on one another. 3. Air guide body according to claim 1 or 2, characterized in that that the individual channels (20) of a row of rings (21) and / or adjacent rows of rings (21a, 21b) are molded on Support spacer bars (32) on one another, through which the walls (22, 23) of the individual channels (20) are spaced a certain distance apart 130064/0173 Deutsche Bank (Munich) KIo. 51/61070 Dresdner Bank (Munich) Account 3939 844 Postscheck (Munich) Account 670-43-804 TX ORIGINAt-tNSPEpTED DE 0384 can be fixed to each other with the formation of double walls (34). 4. Air guide body according to claim 3, characterized in that that in the double walls (34) dam material (35) is inserted. 5. air guide body according to claim 1 to 4, characterized characterized in that the flow units (24) over The annular flanges (30, 31) are centered and bundled, which from the respective end faces of the air guide body (4) can be postponed. 6. air guide body according to claim 1 to 5, characterized characterized in that adjacent wall sections (22, 23) of the individual channels (20) by a snap connection (40) can be fixed in their associated position. 7. air guide body according to claim 6, characterized shows that each snap connection (40) is formed by a spring ring collar (41) protruding on one side, which can be snapped into a groove ring collar (42) formed in the adjacent wall (22, 23), where in the assembled state within the ring collar (40, 41) a passage opening (44) remains. 8. air guide body according to claim 1 to 7, characterized characterized in that adjoining individual channels (20) are glued together.
30th 130064/0173