DE102015000629A1 - Turbo compressor - Google Patents

Abstract

The invention relates to a turbocompressor, comprising an impeller (1) for compressing a compressible fluid, wherein the impeller (1) for guiding the fluid is associated with a flow guiding device (2) and a pressure measuring point (3) acted upon by the fluid. According to the invention it is provided that the pressure measuring point (3) is associated with a Strömungsabschirmelement (4) for forming a dead water area pneumatically connected to a main flow of the fluid.

Description

The invention relates to a turbocompressor according to the preamble of patent claim 1.

A turbocompressor of the type mentioned is from the patent document DE 197 26 547 A1 known. This turbocompressor consists of an impeller for compressing a compressible fluid (in particular air), wherein the impeller for guiding the fluid is associated with a flow guide device and this is acted upon by the fluid pressure measuring point. In this solution, a plurality of pressure measuring points are arranged in a measuring plane around the circumference of the flow guide device designed as an inlet nozzle in order to determine an averaged pressure measurement. This construction is so expensive.

The invention has for its object to improve a turbocompressor of the type mentioned, which can optionally be designed as axial or radial compressor. In particular, a turbocompressor is to be created in which a comparably good pressure measurement result can be achieved with less effort.

This object is achieved with a turbocompressor of the type mentioned by the features listed in the characterizing part of patent claim 1.

According to the invention, it is thus provided that the pressure measuring point is associated with a flow shielding element in order to form a dead water region which is pneumatically connected to a main flow of the fluid (in particular the air).

In other words, the solution according to the invention is thus distinguished by the fact that a preferably multiple pressure measuring point-large dead water area for the fluid is created by the flow shielding element - behind this shielded from the main flow, d. H. it inevitably takes place over this area, a pressure compensation in not disturbed by the main flow fluid, so that with the pressure measuring point, although this is basically acted upon by the fluid only at a singular point, an average value can be measured. Forming what is preferred and explained in more detail below, the flow shielding element as round or circular ring around the typical circular, in particular circular, flow guiding device, so ultimately with a single pressure measuring a valid for the total circumference average pressure reading is detected become.

The well-known from fluid mechanics term "dead water area" (see also http://de.wikipedia.org/w/index.php?title=Totwasser&oldid=135818888 ) in the present context, of course, does not refer to water, but to the compressible fluid to be compressed, in this case in particular air.

The term "pressure gauge size" refers to a maximum extent of the pressure measuring point transverse to the main flow direction. For example, if the pressure measuring point is circular in cross-section, which will be the case on a regular basis, the term "pressure gauge size" refers to the diameter of the pressure measuring point.

Other advantageous developments of the turbocompressor according to the invention will become apparent from the dependent claims.

For the sake of completeness is still on the above-mentioned patent document DE 197 26 547 A1 in this context technically similar patent document EP 0 419 798 A1 pointed.

The turbocompressor according to the invention including its advantageous developments according to the dependent claims will be explained in more detail with reference to the drawing of a preferred embodiment.

It shows (each in perspective)

1 in section, the turbocompressor with the Strömungsabschirmelement invention from above and a sake of simplicity only schematically illustrated impeller;

2 the Strömungsabschirmelement according to 1 from underneath;

3 uncut the turbo-compressor according to 1 ; and

4 an excerpt from 1 ,

The turbocompressor shown in the figures and used as a blower for a heating burner consists initially in a conventional manner of a (only schematically illustrated) impeller 1 for compressing a compressible fluid (here air), the impeller 1 for guiding the fluid, a flow guiding device 2 and this one acted upon by the fluid pressure measuring point 3 assigned.

It is further provided that the turbocompressor is designed as a radial compressor and the flow guiding device 2 accordingly one to the impeller 1 axial inflow area 5 , a helical shape around the wheel 1 arranged casing 11 and one to the housing 11 tangential or to the impeller 1 radial outflow area 12 having.

Essential for the turbocompressor according to the invention is now that the pressure measuring point 3 to form a pneumatically connected to a main flow of the fluid dead water or dead water space a Strömungsabschirmelement 4 assigned.

As already explained, the impeller is 1 one of the flow guide device 2 formed inflow area 5 assigned. With respect to the flow shielding member 4 is particularly preferably provided that this at the inflow 5 is arranged.

It is further provided that the inflow region 5 as a towards impeller 1 continuously tapered nozzle is formed, in which case (see in particular 1 ) the flow shielding element 4 forming a gap forming the dead water area or the dead water space 6 Contour-matched is arranged at or to the nozzle.

Furthermore, it is provided that the dead water area on the one hand by the flow guiding device 2 and on the other hand, from the flow shielding member 4 is formed enclosed.

As already mentioned, it is particularly preferred that the flow shielding element 4 as a particularly round inflow area 5 of the impeller 1 enclosing ring or at least partial ring is formed. It is also between the flow guide area 2 and the annular flow shield member 4 an annular dead water area is formed, that is, it adjusts over the entire circumference of the annular Totwasserraums a pressure equalization, so that at the main flow-side pressure measuring point 3 measured pressure value ultimately a representative pressure mean value of the inflow region 5 represents.

However, since this (absolute) pressure value also depends on the ambient pressure of the turbocompressor, it is further preferred that an additional pressure measuring point be provided in a region unaffected by the main flow of the fluid 7 is arranged, which serves to detect the ambient pressure, so that conclusions can be drawn by forming the differential pressure on the flow velocity of the fluid and thus at a known density on the volume flow of the fluid.

Considered in more detail, is at Strömungsabschirmelement 4 for the additional pressure measuring point 7 an additional dead water area 8th intended. This is pneumatically connected to the environment of the turbocompressor, but formed shielded from the main flow of the fluid. Or again in other words: the additional pressure measuring point 7 is away from the main flow on Strömungsabschirmelement 4 arranged.

The two pressure measuring points 3 and 7 serve in the present application, ultimately, to adjust the fuel-air mixture of the heater burner, being considered even more specific, the volume flow determination of the main flow of the fluid with the pressure measuring point 3 and the additional pressure measuring point 7 connected, typically in the heating control integrated computing unit is provided. Optionally have the pressure measuring point 3 and / or the additional pressure measuring point 7 a hose connection piece 9 over which they are then ultimately connected to suitable, not specifically illustrated pressure measuring devices.

Again with reference to 1 is furthermore preferably a connection opening between a flow region of the main flow of the fluid and the dead water region 10 intended. Here is a main plane of the connection opening 10 oriented substantially parallel to the main flow of the fluid, with the proviso "substantially" expressing that the main flow ultimately simply at the connection opening 10 past and not flowing into the dead water area.

Furthermore, it shows in particular 4 in that the dead water area is considered (apart from the pressure measuring point 3 ) exclusively for the connection opening 10 open gap 6 is trained.

Finally, as can be seen from the figures, for guiding the main flow of the fluid at the flow shielding element 4 (Facing away from the flow device or facing away from the housing) a plurality of preferably rib-shaped flow guide elements 13 arranged. In each case, a main plane of the flow guide is 13 on one or the main axis of the impeller 1 aligned trained.

The turbocompressor according to the invention works as follows: The impeller 1 is typically rotated by an electric motor (not shown). This causes air over the inflow area 5 is sucked. This air passes the impeller 1 and is compressed to the discharge area 12 promoted. Following this, the air is added to an amount of fuel, especially gas, defined by the control unit to form a fuel-air mixture. The named Control unit uses the at the two pressure measuring points 3 and 7 determined pressure readings, which are sufficiently accurate thanks to the inventive solution and further, previously required measurements on the remaining circumference of the inflow 5 can be waived.

LIST OF REFERENCE NUMBERS

1

Wheel

2

Flow guide device

3

Pressure measuring point

4

Strömungsabschirmelement

5

inflow

6

gap

7

Additional pressure measuring point

8th

Zusatztotwasserbereich

9

Hose connectors

10

connecting opening

11

casing

12

outflow region

13

flow guide

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19726547 A1 [0002, 0010]
• EP 0419798 A1 [0010]

Cited non-patent literature

• http://en.wikipedia.org/w/index.php?title=Totwasser&oldid=135818888 [0007]

Claims (10)

Turbo compressor comprising an impeller ( 1 ) for compressing a compressible fluid, wherein the impeller ( 1 ) for guiding the fluid, a flow guiding device ( 2 ) and this one acted upon by the fluid pressure measuring point ( 3 ), characterized in that the pressure measuring point ( 3 ) to form a pneumatically connected to a main flow of the fluid Totwasserbereichs a Strömungsabschirmelement ( 4 ) assigned. A turbocompressor according to claim 1, wherein the impeller ( 1 ) one of the flow guiding device ( 2 ) formed inflow area ( 5 ), characterized in that the flow shielding element ( 4 ) at the inflow area ( 5 ) is arranged. A turbocompressor according to claim 2, wherein the inflow region ( 5 ) as a towards the impeller ( 1 ) is formed continuously tapered nozzle, characterized in that the Strömungsabschirmelement ( 4 ) forming a gap forming the dead water zone (US Pat. 6 ) contour-matched to the nozzle is arranged. Turbo compressor according to one of claims 1 to 3, characterized in that the dead water area on the one hand by the flow guiding device ( 2 ) and on the other hand from the flow shielding element ( 4 ) is formed enclosed. Turbo compressor according to one of claims 1 to 4, characterized in that the Strömungsabschirmelement ( 4 ) as a particularly round inflow region ( 5 ) of the impeller ( 1 ) enclosing ring or at least partial ring is formed. Turbo compressor according to claim 5, characterized in that between the flow guide region ( 2 ) and the annular formed Strömungsabschirmelement ( 4 ) an annular Totwasserbereich is formed. Turbo compressor according to one of claims 1 to 6, characterized in that in a region uninfluenced by the main flow of the fluid, an additional pressure measuring point ( 7 ) is arranged. Turbo compressor according to claim 7, characterized in that on Strömungsabschirmelement ( 4 ) for the additional pressure measuring point ( 7 ) an additional dead water area ( 8th ) is provided. Turbo compressor according to claim 8, characterized in that the additional dead water area ( 8th ) is pneumatically connected to the environment of the turbocompressor, but is shielded from the main flow of the fluid. Turbo compressor according to one of claims 7 to 9, characterized in that for the volume flow determination of the main flow of the fluid with the pressure measuring point ( 3 ) and the additional pressure measuring point ( 7 ) connected computing unit is provided.

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