Flow conditioner

Abstract

The invention relates to a flow conditioner for conditioning a fluid flow comprising a pipe having a constriction with a reduced pipe cross-section, at least one ring-shaped element arranged inside the pipe which has an outer diameter which is smaller than the inner diameter of the pipe in the axial region of the pipe in which the at least one ring-shaped element is arranged, and having an areal web whose surface normal is not in parallel with the pipe axis. The invention further relates to a throughflow measurement system for measuring a fluid throughflow through a pipe having a measurement device and a flow conditioner in accordance with the invention arranged upstream of the measurement device.

Claims

1. A flow conditioner (1) for conditioning a fluid flow which comprises the following: a pipe (9, 11) having a constriction (15) with a reduced pipe cross-section; at least one ring-shaped element (21, 23) which is arranged inside the pipe (9, 11) and which has an outer diameter which is smaller than the inner diameter of the pipe (9, 11) in the axial region of the pipe (9, 11) in which the at least one ring-shaped element is arranged; and at least one areal web (25, 27) whose surface normal is not in parallel to the axis (A) of the pipe (9, 11), wherein a plurality of webs (25) are provided which are tapered against a flow direction (3) and a plurality of webs (27) are provided which are tapered in the flow direction (3), and wherein the webs (25) tapered against the flow direction and the webs (27) tapered in the flow direction are alternately arranged in the peripheral direction of the pipe (9, 11).

2. A flow conditioner (1) in accordance with claim 1, wherein the surface normal of the at least one web (25, 27) is perpendicular to the direction of the pipe axis (A).

3. A flow conditioner (1) in accordance with claim 1, wherein a surface of the at least one web (25, 27) in the pipe (9, 11) extends radially outwardly.

4. A flow conditioner in accordance with claim 1, wherein at least two ring-shaped elements (21, 23) are arranged inside the pipe (9, 11) which have an outer diameter which is smaller than the inner diameter of the pipe (9, 11) in the axial region of the respective ring (9, 11).

5. A flow conditioner in accordance with claim 4, wherein the at least two ring-shaped elements (21, 23) have different diameters.

6. A flow conditioner in accordance with claim 4, wherein the ring-shaped element (21) arranged upstream in the flow direction is located in the axial region of the at least one constriction (15).

7. A flow conditioner in accordance with claim 4, wherein the at least one web (25, 27) is located with at least half its axial extent in the axial region between the ring-shaped elements (21, 23).

8. A flow conditioner in accordance with claim 1, wherein the at least one ring-shaped element (23) is held by at least one web (25, 27).

9. A flow conditioner in accordance with claim 1, wherein at least one inner pipe (32) has a smaller diameter than the diameter of the pipe (9, 11).

10. A flow conditioner in accordance with claim 9, wherein the at least one inner pipe (32) is held by at least one web (25, 27).

11. A flow conditioner in accordance with claim 9, wherein the axis of the inner pipe (32) is in parallel to the pipe axis (A) of the pipe (9, 11).

12. A flow conditioner in accordance with claim 9, wherein the axis of the inner pipe (32) coincides with the pipe axis (A) of the pipe (9, 11).

13. A throughflow measurement system for measuring a fluid throughflow through a pipe comprising a measurement device for carrying out a measurement at the fluid; and a flow conditioner (1) arranged upstream of the measurement device, wherein the flow conditioner (1) comprises a pipe (9, 11) having a constriction (15) with a reduced pipe cross-section; at least one ring-shaped element (21, 23) which is arranged inside the pipe (9, 11) and which has an outer diameter which is smaller than the inner diameter of the pipe (9, 11) in the axial region of the pipe (9, 11) in which the at least one ring-shaped element is arranged; and at least one areal web (25, 27) whose surface normal is not in parallel to the axis (A) of the pipe (9, 11), wherein a plurality of webs (25) are provided which are tapered against a flow direction (3) and a plurality of webs (27) are provided which are tapered in the flow direction (3), and wherein the webs (25) tapered against the flow direction and the webs (27) tapered in the flow direction are alternately arranged in the peripheral direction of the pipe (9, 11).

14. A throughflow measurement system in accordance with claim 13, wherein the measurement device is an ultrasound measurement device.

15. A throughflow measurement system in accordance with claim 13, wherein the measurement device is adapted to measure a speed of the fluid.

Description

(1) The invention will be explained in detail in the following with reference to an embodiment in accordance with the invention which is shown in the Figures. There are shown:

(2) FIG. 1 a side plan view of an embodiment of a flow conditioner in accordance with the invention;

(3) FIG. 2 a plan view of the flow conditioner of FIG. 1 in the direction of gaze II given in FIG. 1;

(4) FIG. 3 an oblique plan view of the same side which is shown in FIG. 2;

(5) FIG. 4 a view of the flow conditioner of FIG. 1 in the direction of gaze IV such as is given in FIG. 1;

(6) FIG. 5 an oblique plan view of the same side which is shown in FIG. 4;

(7) FIG. 6 a side section through the flow conditioner of FIG. 1 in a sectional plane such as is given by VI in FIGS. 2 and 4;

(8) FIG. 7 a side section through the flow conditioner of FIG. 1 in a sectional plane such as is given by VII in FIGS. 1, 2 and 4;

(9) FIG. 8 a side section through the flow conditioner of FIG. 1 in a plane such as is given by VIII in FIGS. 2 and 4; and

(10) FIG. 9 an oblique elevation of the flow conditioner of FIG. 1;

(11) FIG. 1 shows in a side plan view a flow conditioner 1 which can be used, e.g. as an intermediate element, in a pipe flowed through by a fluid. Reference numeral 3 designates the flow direction of the fluid in the flow conditioner 1. The fluid flows e.g. through an inflow pipe into the flow conditioner 1 which is fastened, e.g. flanged, in a manner known per se to the lug of the flow conditioner 1 shown at the right in FIG. 1. The fluid flows out of the flow conditioner 1 again at the side shown at the left in FIG. 1, e.g. into an outflow pipe which is likewise fastened, e.g. flanged, in a manner known per se to the side 7. Reference numeral 5 correspondingly designates the inflow side, whereas reference numeral 7 designates the outflow side. The flow conditioner shown comprises two parts 8, 10 and includes to pipe parts 9, 11 which are connected to one another in a manner known per se at the lug 13.

(12) A flow conditioner in accordance with the invention does not have to comprise two parts, however. In addition, it can also be implemented directly in a pipe which is flowed through without this representing an insert part to be flanged therebetween.

(13) Reference numeral 15 designates a constriction in the pipe cross-section in the first part 8 of the flow conditioner 1. The pipe axis is designated by A.

(14) Differing from the embodiment shown in which the pipe 9, 11 has a corresponding indentation, the constriction can also be obtained by an installation element reducing the cross-section in an otherwise uniform pipe.

(15) FIG. 2 shows a plan view of the inflow elements 5 of the flow conditioner 1 shown in FIG. 1, that is in the direction of gaze II given there. FIG. 3 likewise shows a plan view of the side 5 in a slightly slanted position. The view in FIGS. 2 and 3 is therefore through the constriction 15 to the inner workings of the flow conditioner 1 which will be explained in more detail further below.

(16) FIG. 4 shows a view of the outflow side 7 in the direction of gaze IV, as is indicated in FIG. 1. FIG. 5 shows a view of the same side of the flow conditioner in a slightly slanted position. FIGS. 4 and 5 allow a view of the inner workings of the flow conditioner 1 which will be explained in more detail further below.

(17) FIGS. 6, 7 and 8 show side sections through the flow conditioner 1 along the sectional plane which is indicated by VI, VII and VIII in FIG. 2. In addition, in FIGS. 6, 7 and 8 the directions of gaze II and IV are indicated which correspond to FIGS. 2 and 4.

(18) FIG. 9 additionally shows for better illustration an elevated view of the flow conditioner 1 in a slanted view.

(19) It can be seen from the Figures that the following installations are located inside the two parts 8, 10 of the flow conditioner 1:

(20) A first ring 21 can in particular easily be recognized in FIGS. 2, 3, 6, 8 and 9. In the lateral sectional views of FIGS. 6, 8 and 9, its sectioned surfaces 21s can also clearly be seen.

(21) In the embodiment shown, the first ring 21 is formed with sharp edges in the follow-on direction.

(22) A second ring 23 can furthermore be seen in the Figures which is arranged behind the first ring 21 in the follow-on direction. The ring 23 can be recognized particularly clearly in FIGS. 4, 5, 6, 7, 8 and 9. The sectional surfaces of the ring 23 visible in the side sections of FIGS. 6, 7, 8 and 9 are designated by reference numeral 23s. The diameter of the second ring 23 is larger than the diameter of the first ring 21. It is in particular ensured by the different diameters that a fluid flowing in the flow direction 3 can fully impact on both rings.

(23) In addition, webs 25, 27 are provided in the flow conditioner 1 which extend radially outwardly and in parallel to the pipe axis A.

(24) The first webs 25 are tapered against the flow direction 3, whereas the second webs 27 are tapered in the flow direction 3. The term “tapering” against the direction of flow is used in this respect to indicate for the webs 25 that they extend against the flow 3 in the pipe center. A web arrangement “tapered in the direction of the direction of flow 3”, such as the webs 27 show, extends in the downstream direction in the pipe center.

(25) In the embodiment shown, six first webs 25 are provided which are tapered against the flow direction 3 and six second webs 27 which are tapered in the flow direction 3. These two types of web 25, 27 are arranged alternately.

(26) The sectional surfaces 25 and 27 respectively are designed by reference numerals 25s and 27s in the corresponding sectional representations of FIGS. 6, 7, 8 and 9.

(27) The webs 25 have radially outwardly arranged regions 26 at which they are fastened within the pipe of the second flow conditioner 11.

(28) The radially outer fastening parts 26 and the webs 25 tapered against the flow direction 3 can in this respect be formed in one piece and have the same areal alignment. The fastening parts 26 in this respect then each form a part of the webs 25.

(29) All the webs in the embodiment shown have prolongations 30 which bear the ring 23 disposed downstream in the flow direction 3.

(30) In particular those elements which can be recognized with the first ring 21, the second ring 23, the tapered webs 25, 27, the fastening regions 26 and the prolongations 30 for bearing the second ring 23 are not all respectively marked by the corresponding reference numerals in the Figures for reasons of clarity. Only respective representative reference numerals are added in the Figures.

(31) In the region close to the axis, the webs 25, 27 bear an inner pipe 32 whose axis corresponds to the pipe axis A.

(32) The axial extent of the arrangement of rings 21, 23, webs 25, 27 and inner pipe 32 is in this embodiment approximately as large as the inner diameter of the pipe of the flow conditioner 1 in a region in which the constriction 15 is not located, that is here e.g. in the region of the second pipe part 11. The arrangement of rings 21, 23, webs 25, 27 and inner pipe 32 adjoins the constriction 15 in the flow direction 3.

(33) The inner structure of the flow conditioner 1 is mutually connected by the connection of the webs 25 tapered against the flow direction 3 via the inner pipe 32 or via the prolongations 30 and the second ring 23 with the webs 27 tapered in the flow direction 3 The unit is carried by the fastening regions 26 in the radially outwardly arranged regions of the webs 25. The total arrangement can also be in one piece, for example a one-piece plastic part.

(34) The embodiment shown is used as follows.

(35) The flow conditioner 1 is placed in a fluid pipe, with the embodiment shown being interposed by flanging as an intermediate piece in the fluid pipe. In the follow-on of the flow conditioner 1 (that is on the left hand side in FIG. 1), an ultrasound measurement e.g. follows downstream with which the throughflow speed of a fluid, e.g. of a gas, can be measured in a manner known per se.

(36) Disturbances in the flow such as are e.g. caused by curves, constrictions or similar upstream (that is on the right hand side in FIG. 1) in the fluid pipe region disposed before the flow conditioner 1 are effectively combated by the flow conditioner 1.

(37) In this respect, the constriction 15 effects a centration and an acceleration of the flow. The first ring 21 breaks up the core flow and asymmetry. A first mixing in the follow-on of the ring 21 arises which homogenizes an unequal axial speed profile. The second ring 23 amplifies this effect.

(38) The tapered webs 25 and 27 and the inner pipe 32 further divide the follow-on and increase the mixing. This is in particular advantageous with an inflow with swirl. A swirl axis of any swirl which may be present is displaced into the center of the pipe axis A by the previously occurring centration of the flow by the constriction 15. In this manner, the tangential speed portions determining the swirl are maximally distributed over the side surfaces of the webs. The follow-on of a web directed to the front impacts again on a rearwardly directed web due to the alternating tapering of the webs 25, 27. The alternating direction of the web tapering moreover additionally induces shear flow between the follow-on portions which are oppositely orientated in the radial direction with each next web in the peripheral direction.

(39) The cooperation of the constriction 15, the areal webs 27, 27 and the rings 21, 23 therefore serves in a particularly effective manner for the flow conditioning for a measurement in the follow-on of the flow conditioner 1 which is as undisturbed as follows.

REFERENCE NUMERAL LIST

(40) 1 flow conditioner 3 fluid flow direction 5 inflow side 7 outflow side 8 first part of the flow conditioner 9 first pipe part 10 second part of the flow conditioner 11 second pipe part 13 lug 15 constriction 21 first ring 21s sectioned surface of the first ring 23 second ring 23s sectioned surface of the second ring 25 web tapered against the flow direction 25s sectioned surface of the first web 26 fastening regions for fastening the webs 25 27 web tapered in the flow direction 27s sectioned surface of the second web 30 prolongation 32 inner pipe A pipe axis II, IV direction of gaze VI, VII, VIII cross-sectional surface