DE10328235A1 - Swirling section and device for tempering a component - Google Patents

Abstract

Turbulence system (17) in a control system (02) for controlling the temperature of a component (01) of a machine comprises in direct succession a cross-section enlargement, a direction change, and a cross-section reduction. An Independent claim is also included for a device for controlling the temperature of a component of a printing machine using a fluid whose temperature is changed at a feed point (16). Preferred Features: The turbulence system is arranged in a control system for controlling the temperature of a component of a printing machine. The turbulence system is arranged between a feed point and the component.

Description

The invention relates to a swirling section and a device for tempering a component according to the preamble of claims 1 or 4.

Through the DE 44 29 520 A1 A device and a method for tempering a component in a printing press are known, the component being tempered using an at least partially circulating fluid. An actuator, by means of which a mixing ratio can be set at a feed point of two fluid flows of different temperatures, is controlled via a temperature measuring point arranged between the feed point and the component.

The EP 0 886 577 B1 discloses a device and a method for temperature control of a component, wherein a component temperature is monitored by means of sensors and the measured value is given to a control unit. If the temperature measured on the component deviates from a setpoint, the control unit lowers or increases the temperature of a coolant in a cooling unit by a certain amount, waits for a period of time and repeats the measurement and the steps mentioned until the setpoint is reached again.

The invention has for its object a Swirling section and a device for tempering a To create component.

The object is achieved by the Features of the claims 1 or 4 solved.

The achievable with the invention Advantages are in particular that a very effective mixing on the shortest Distance and therefore in the shortest possible time Time is achieved without expensive internals.

The tempering works due to the swirling section, which is the early extraction of a safe Mixed temperature signal allows, too in the case of larger subsequent ones Transport routes for the tempering medium, very fast and stable. The short response time allows use in applications and processes with high dynamic proportions. So the present temperature control is also of great advantage there, where quick changes must be reproduced in a temperature setpoint and / or where there are external conditions such as B. Energy input due to friction or outside temperature, change very quickly.

Embodiments of the invention are shown in the drawings and are described in more detail below.

Show it:

1 a schematic representation of the temperature control section;

2 a more detailed section of the in 1 shown tempering section;

3 a first embodiment for a swirl chamber;

4 a second embodiment for a swirl chamber;

5 a third embodiment for a swirl chamber.

A component 01 a machine, e.g. B. a printing press, should be tempered. The component 01 the printing press is e.g. B. part of a printing unit, not shown, in particular an ink-guiding roller 01 of a printing unit. This roller 01 can as a roller 01 an inking unit, e.g. B. as anilox roller 01 , or as a cylinder 01 the printing unit, e.g. B. as a forme cylinder 01 , be executed. The device described below and the method for temperature control can be used particularly advantageously together with a printing unit for waterless offset printing, ie a printing unit without the use of dampening solution. In the printing unit, in particular a printing unit for waterless offset printing, the quality in the ink transfer is extremely dependent on the temperature of the ink and / or the ink-guiding surfaces (e.g. surface area of rollers 01 or cylinders 01 ). In addition, the quality of the ink transfer is also sensitive to the splitting speed, i.e. the machine speed.

The temperature control takes place via a temperature control medium, in particular a fluid such as e.g. B. water, which over a tempering section 02 with the component 01 is brought into thermal interaction. Should the component 01 flowed with the fluid, the fluid can also be a gas or gas mixture, such as. B. be air. The component is used for temperature control 01 in a first cycle 03 the fluid is supplied, flows through or flows around the component 01 , absorbs heat (cooling) or emits heat (heating) and flows back heated or cooled accordingly. In this first cycle 03 a heating or cooling unit can be arranged, which can be used to produce the desired fluid temperature.

According to the advantageous embodiment 1 is the first cycle 03 however as a secondary circuit 03 in connection with a second circuit 04, a primary circuit 04 , in which the fluid with a defined and largely constant temperature Tv, z. B. flow temperature Tv. A temperature control device, e.g. B. a thermostat, a heating and / or cooling unit, etc., which ensures the flow temperature Tv, is not shown here. Via a connection 05 between primary and secondary circuit 03 ; 04 can at a first junction 06 of the primary circuit 04 via an actuator 07 , e.g. B. a controllable valve 07 , Fluid from the primary circuit 04 removed and the secondary circuit 03 be added. At a second junction 08 depending on the supply of new fluid at the connection point 06 , Fluid from the secondary circuit 03 at a junction 10 over a connection 15 in the primary circuit 04 returned. For this purpose, for example, the fluid is located in the area of the first connection point 06 at a higher pressure level than in the area of the second connection point 08 , A difference Δp in the pressure level is e.g. B. by a corresponding differential pressure valve 09 between the connection points 06 ; 08 generated.

The fluid, or a large part of the fluid, is driven by a drive 11 , for example by a pump 11 , a turbine 11 or in some other way, on an inflow route 12 , through the component 01 , a return line 13 and a section 14 between inflow and return flow 12 ; 13 in the secondary circuit 03 circulated. Depending on the supply via the valve 07 flows after passing through the component 01 an appropriate amount of fluid across the connection 15 in the primary circuit 04 or a correspondingly reduced amount of fluid through the section 14 , The one over the section 14 the flowing back part and the fresh one over the valve 07 at an infeed or injection point 16 supplied part mix and now form the fluid specifically controlled for temperature control. In an advantageous embodiment, to improve the mixing, it is as possible as possible directly behind the injection point 16 , especially between the injection point 16 and the pump 11 , a swirling stretch 17 , in particular a swirl chamber 17 , arranged.

In the above case, that not by means of a primary circuit 04 , but is tempered by means of a heating or cooling unit, corresponds to the feed or injection point 16 the location of the energy exchange with the relevant heating or cooling unit and the actuator 07 for example a power control or the like assigned to the heating or cooling unit. The connection point 10 in the circuit 03 omitted, since the fluid is in circulation 03 circulates and at the feed point 16 Energy is supplied or removed or heat or cold is "fed in." The heating or cooling unit corresponds, for example, to the actuator 07 ,

Ultimately, a specific temperature θ _{3 of} the component should be achieved by the temperature control 01 , especially in the case of a roller 01 the surface temperature θ ₃ on the roller 01 to a specific setpoint θ _{3, should be} set or held. This is done by measuring a meaningful temperature on the one hand and regulating the supply of fluid from the primary 04 in the secondary circuit 03 to generate a corresponding mixing temperature on the other hand.

In an advantageous embodiment, there are between the injection point 16 and an outlet of the component to be tempered 01 at least two measuring points M1; M2; M3 with sensors S1; S2; S3 is provided, with one of the measuring points M1 near the injection point 16 and at least one of the measuring points M2; M3 in the area of the inflow section near the component 12 and / or in the area of the component 01 itself is arranged. The valve 07 , the pump 11 , the injection point 16 as well as the connection points 06 ; 08 are usually spatially close to each other, and z. B. in a dashboard indicated tempering cabinet 18 arranged. Inflow and return flow path 12 ; 13 between the component 01 and the not explicitly shown exit or entry into the temperature control cabinet 18 usually have a comparatively large length compared to the other routes, which in 1 is indicated by respective interruptions. The locations for the measurement are now selected so that at least one measuring point M1 each in the area of the temperature control cabinet 18 and a measuring point M2; M3 close to the component, i.e. at the end of the long inflow section 12 is arranged.

In the embodiment according to 1 a first temperature Θ is measured between the injection point 16 and the pump 11 , especially between a swirl section 17 and the pump 11 , by means of a first sensor S1. A second temperature θ ₂ is determined by means of a second sensor S2 in the area of entry into the component 01 determined. The temperature θ ₃ is in 1 also determined by measurement, namely by one on the surface of the roller 01 directed infrared sensor (IR sensor) S3. The sensor S3 can also be arranged in the area of the lateral surface or as explained below u. U. also omitted.

The temperature control takes place with the help of a control device 21 or a regulatory process 21 , which is described in more detail below. The control device 21 ( 1 ) is based on a multi-loop, here three-loop cascade control. An innermost control circuit shows sensor S1 just behind the injection point 16 , a first controller R1 and the actuator 07 , ie the valve 07 , on. The controller R1 receives, as an input variable, a deviation Δθ _{1 of} the measured value θ ₁ from a (corrected) setpoint θ _{1, soll, k} (node K1) and acts on the actuator according to its implemented control behavior and / or control algorithm with a control command Δ 07 , I.e. Depending on the deviation of the measured value θ ₁ from the (corrected) setpoint θ _{1, Soll, k, it} opens or closes the valve 07 or maintains the position. The (corrected) setpoint θ _{1, soll, k} is not, as is otherwise customary, directly specified by a controller or manually, but is formed using an output variable from at least one second control circuit located further “outside”. The second control circuit has sensor S2 shortly before entering the component 01 as well as a second regulator R2. The controller R2 receives as an input variable a deviation Δθ _{2 of} the measured value θ ₂ at the sensor S2 from a (corrected) setpoint θ _{2, soll, k} (node K2) and generates one with the deviation at its output in accordance with its implemented control behavior and / or control algorithm Δθ ₂ correlated variable dθ ₁ (output variable dθ ₁ ), which is used to form the corrected setpoint θ _{1, k} above for the first controller R1. I.e. Depending on the deviation of the measured value θ ₂ from the (corrected) target value θ _2, Soll _{, k} is influenced by the quantity dθ ₁ on the corrected to be formed Setpoint θ _{1, Soll, k of} the first controller R1.

In a preferred embodiment, the corrected target value θ _1, target _{, k} for the first controller R1 is formed from the quantity dθ ₁ and a theoretical target value θ ' _1, target. The theoretical target value θ ' _{1, should} in turn is formed in a pilot control with regard to the heat flow V _WF . The pilot control element V _WF , here V _{1, WF} (index 1 for the first control loop) takes into account the heat exchange (losses etc.) of the fluid on a section and is based on empirical values (expert knowledge, calibration measurements etc.). The pilot control element V _{1, WF} takes into account _, for example, the heat or cold losses on the section between the measuring points M1 and M2 by forming a correspondingly increased or decreased theoretical target value θ ' ₁ , which is then together with the quantity dθ ₁ to the corrected setpoint θ _{1, Soll, k is processed} for the first controller R1. In the pilot control element V _{WF there} is a relationship between the input variable (target value θ _3, target or θ ' _2, target or su θ' _2, target _{, n} ) and a corrected output variable (modified target value θ ' _2, target or su θ ' _{1, Soll, n} or θ' _{1, Soll, n} ), which can preferably be changed via parameters or in any other way as required.

In principle, a simple design of the control device is possible, in which only the first two control loops form the cascade control. In this case, the pilot control element V _{1, WF} would be given a defined setpoint value θ _2, setpoint as an input variable from a machine control or manually. This would also be used to form the above-mentioned deviation Δθ ₂ upstream of the second controller R2.

In the in 1 shown embodiment has the control device 21 however, three cascaded control loops. The corrected setpoint θ _{2, soll, k in} front of the second controller R2 is now also not, as is otherwise customary, specified directly by a controller or manually, but is instead formed using an output variable from a third, external control loop. The third control circuit has the sensor S3, which detects the temperature on or in the area of the lateral surface, and a third controller R3. The controller R3 receives as an input variable a deviation Δθ _{3 of} the measured value θ ₃ (with a running time T ' _L3 ) at the sensor S3 from a target value θ _3, target (node K3) and generates one at its output in accordance with its implemented control behavior and / or control algorithm variable dθ ₂ correlated with the deviation Δθ ₃ , which is to _{be used} for the second controller R2 to form the corrected desired value θ _{2 mentioned} above. I.e. Depending on the deviation of the measured value θ ₃ from the setpoint θ _3, setpoint (or a corrected setpoint θ '' _3, setpoint, see below _{) set} by a machine control or manually, the quantity dθ ₂ influences the corrected setpoint θ _2, setpoint _{, k of} the second controller R2.

The corrected setpoint θ _2, Soll _{, k} for the second controller R2 is formed from the quantity dθ ₂ and a theoretical setpoint θ ' _2, Soll (or θ'' _2, Soll see below). The theoretical target value θ ' _{2, soll} is again formed in a pilot control with regard to the heat flow V _{2, WF} . The pilot control element V _{2, WF} takes into account, for example, the heat or cold losses on the section between the measuring points M2 and M3 by forming a correspondingly increased or decreased theoretical target value θ ' ₂ , which is then together with the quantity dθ ₂ to the corrected setpoint θ _{2, Soll, k is processed} for the second controller R2.

The method described is therefore based on the one hand on measuring the temperature directly behind the injection point 16 , in particular with the interposition of a swirl chamber 17 , and at least one measurement close to the component to be tempered 01 , Secondly, a particularly short response time of the control is achieved by the fact that several control loops intermesh in a cascade manner and one closer to the component when the setpoint is being set for the inner control loop 01 current measured value θ ₂ ; θ _{3 is} taken into account. Thirdly, a particularly short response time is achieved by a pilot control, which experience values for on the temperature control section 02 brings expected losses. One closer to the actuator 07 The control loop located is thus already predicted, in anticipation of losses, a setpoint value which has been increased or decreased by an empirical value.

A section of the schematic in 1 temperature control section shown in an advantageous concrete embodiment 2 , The inflow route 12 from the injection point 16 to a destination 22 , ie the place whose surroundings or surface is to be cooled is in 2 in three sections 12.1 ; 12.2 ; 12.3 shown.

The first paragraph 12.1 extends from the injection point 16 to the first measuring point M1 with the first sensor S1 and has a first path X1 and a first mean transit time Ti. The second section 12.2 extends from the first measuring point M1 to a "near-component" measuring point M2 with the sensor S2. It has a second distance X2 and a second mean transit time T _L2 . The third section 12.3 with a third distance X3 and a third mean transit time T _L3 for the fluid connects to the second measuring point M2 and extends to the destination 22 (here the first contact of the fluid in the area of the extended surface). A total run time T of the fluid from the injection point 16 up to the destination, this results in T _L1 + T _L2 + T _L3 . The first measuring point M1 is “near the feed point”, ie at a short distance from the feed point, here the injection point 16 , chosen. A measuring point M1 near the feed point or sensor S1 near the actuating means is therefore a location in the region of the inflow path 12 understood which with respect to the running time of the fluid less than on a tenth, in particular as a twentieth, of the distance from the feed point 16 until the first touch of the destination 22 (here the first is contact of the fluid in the region of the extended circumferential surface), it is considered that T _L1 <0.1 T, especially T _L1 <0.05 T. For a high control dynamics is the measurement point M1 with respect to the period of the fluid T _L1 maximum of 2 seconds, in particular a maximum of 1 second from the injection point 16 away. As already mentioned 1 called, are injection point 16 , Sensor S1 and the following pump 11 in a temperature control cabinet 18 , which forms a structural unit of the included units. The measuring point M1 is preferably in front of the pump 11 ,

Via detachable connections 23 ; 24 in the inflow section 12 as well as the return flow path 13 is the temperature control cabinet 18 with the component 01 connectable.

Usually are component 01 and tempering cabinet 18 not directly adjacent to each other in the machine, so that a line 26 , e.g. B. piping 26 or a hose 26 , from the temperature control cabinet 18 to an entry 27 into the component 01 , for example for an implementation 27 , especially rotary union 27 , has a correspondingly large length. Implementation in the roller 01 or the cylinder 01 is in 2 only shown schematically. Points the roller 01 or the cylinder 01 as usual on the front of a pin, so the implementation is carried out by the pin. The path of the fluid to the lateral surface as well as in the component 01 along the lateral surface is only shown symbolically and can in a known manner, for. B. in axial or spiral channels, in extensive cavities, in a circular cross-section, or in other suitable ways below the outer surface. The second measuring point M2 is "close to the component", ie at a short distance from the component 01 or to the destination 22 , here the lateral surface. Under the second measuring point M2 close to the component or the second sensor S2 close to the component there is therefore a location in the region of the inflow path 12 understood which with respect to the running time of the fluid is farther than halfway from the injection point 16 until the first touch of the destination 22 (here the first contact of the fluid in the area of the extended lateral surface). The following applies: T _L2 > 0.5 T. In order to achieve a high dynamic of the control with a low construction effort for rotating components 01 to obtain the second measuring point M2 in the area of the line 26 stationary outside the rotating component 01 arranged, but is immediately, ie with respect to the running time of the fluid a maximum of 3 seconds from the entry 27 into the component 01 away.

The third measuring point M3, if present, is likewise arranged at least “close to the component”, but in particular “close to the destination”. I.e. it is in the immediate vicinity of the destination 22 of the fluid or directly detects the surface to be tempered (here the surface of the roller 01 ). In an advantageous embodiment, the measuring point M3 does not detect the fluid temperature, such as e.g. B. in the case of measuring points M2 and M3, but the area of the component to be tempered 01 itself. In the immediate vicinity of the destination 22 it is understood here that the sensor S3 is located in the component 01 circulating fluid and the outer surface or detects the temperature θ ₃ on the outer surface without contact.

In another embodiment of the temperature control device, the measuring point S3 can be dispensed with. Conclusions about the temperature θ ₃ can be obtained from empirical values through the measured values of the measuring point M2, for example on the basis of a stored relationship, an offset, a functional relationship. For a desired temperature θ ₃ z. B. taking into account the machine or production parameters (including machine speed, ambient temperature and / or fluid throughput, (doctor blade) friction coefficient, thermal resistance) regulated to a desired temperature θ ₂ as a setpoint.

In a further embodiment, the measuring point M3 is again dispensed with, but conclusions about the temperature θ ₃ can be drawn from empirical values about the measured values of the measuring point M2 and one in the reflux after the component 01 arranged measuring point M4, for example again based on a stored relationship, an offset, a functional relationship and / or by averaging the two measured values. For a desired temperature θ ₃ z. B. either taking into account the machine or production parameters (including machine speed, ambient temperature and / or fluid throughput) again regulated to a desired temperature θ ₂ as the setpoint, or else to the temperature θ ₃ indirectly determined by the two measured values. In 2 are the inflow and outflow of the fluid in or out of the as a roller 01 or cylinder 01 executed component 01 on the same face. Accordingly, the rotary feedthrough has two connections, or, as shown, two coaxially one inside the other and coaxial to the roller 01 arranged bushings. The measuring point M4 is also located as close as possible to the bushing.

In the advantageous embodiment of the temperature control device, it points to the section 12.1 between feed point 16 and first measuring point M1 a swirl path 17 , especially a specially designed swirl chamber 17 , on. As already mentioned above, the measuring point M1 should be arranged close to the feed point, so that the fastest possible response times in the relevant control loop with the measuring point M1 and the actuator 07 are realizable. On the other hand, however, a homogeneous mixture between the fed-in and returned fluid (or in the heated / cooled fluid) has generally not yet been achieved directly behind the feed point, so that measurement errors make it difficult to regulate and u. U. reaching the ultimately desired temperature θ ₃ on the component 01 delay significantly.

The use of the swirl line 17 , especially the specially designed swirls lung chamber 17 according to 3 and 4 , ensure a safe mixing of the fluid at a short distance in a simple manner, so that the above-mentioned condition regarding the short transit time T1 can be met.

A first change in cross-section takes place in the smallest installation space, a first cross-sectional area A1 suddenly increasing by at least a factor f1 = 2 to a second cross-sectional area A2. In the direct connection there is a change in direction from 70 ° to 110 °, in particular abruptly by approx. 90 °, which is followed by a second change in cross-section, namely reduction from cross-sectional area A2 to cross-sectional area A3 with the factor f2 (f2 <1). The factor f2 is advantageously chosen f2 0,5 0.5 and is chosen to be complementary to the factor f1 such that the two cross-sectional areas A1; A3 before and after the swirl chamber 17 are essentially the same size.

3 shows an embodiment of the swirl chamber 17 with (round) tubular inlet and outlet area 29 ; 31 , not shown tubular lines with cross-sectional area A1 here in centrally arranged openings 32 ; 33 as an inlet 32 and outlet 33 lead. The bump line 34 the tubular inlet and outlet areas 29 ; 31 does not form a pipe bend with a continuous curvature, but is at least angularly bent in a plane formed by the flow directions in the border and outlet area (see kink 36 ; 37 ). The openings 32 ; 33 can also be non-centered in areas A2; A3 lie.

4 shows an embodiment, wherein the swirl chamber 17 is carried out in the geometry of a joint of two box-shaped tubes. Here again two surfaces A2 each have the openings 32 ; 33 on. Here, too, is the change of direction in the area of the existing or “imagined” impact 34 of the inlet and outlet area (sharp) edged (see kink 36 ; 37 ). The openings 32 ; 33 can again be arranged asymmetrically in the areas A2.

5 shows an embodiment, wherein the swirl chamber 17 in the geometry of a cuboid, in a special version as in 4 as a cuboid of the same side edge lengths. Here, two adjacent surfaces A2 each have the openings 32 ; 33 on. Here, too, is the change of direction in the area of the "imaginary impact" ( 34 ) of the inlet and outlet area (sharp) edged (see kink 36 ; 37 ). Again, the openings 32 ; 33 again be arranged asymmetrically in the areas A2.

01

component Roller, anilox roller, cylinder, forme cylinder

02

Controlled system, tempering

03

Circulation, first; Secondary circuit

04

Circulation, second; Primary circuit

05

connection

06

Juncture first

07

Actuator Valve

08

Juncture second

09

Valve, Differential pressure valve

10

junction

11

Drive, Pump, turbine

12

flow path

12.1

Section, first

 12.2

Section, second

12.3

 Section, third

13

Return path

14

leg

15

connection

16

feed point, Injection site

17

A turbulence, swirl

18

temperature control cabinet

19

20

21

Control device, control process

 22

destination

23

Connection, solvable

24

Connection, solvable

25

26

Management, Piping, hose

27

Entry, Execution, Rotary union

28

29

inlet area

30

31

outlet

32

Opening, inlet

33

Opening, outlet

34

surge line

35

36

kink

37

kink

A1 up to A3

Areas, cross-sectional area

K1 to K3

 node

M1 up to M4

measuring points

R1 to R3

regulator

 S1 to S4

sensors

_Te

time constant (Index i denotes the control loop)

T _Li

Running time, Fluid (index i denotes the control loop)

T ' _L3

Running time, Temperature response at sensor S3

T _V

Temperature, flow temperature

V _{(i) WF}

pilot member regarding heat flow (index i denotes the control loop, if applicable)

dθ _i

Size, initial size

Δθ _i

deviation

θ _i

Temperature, Measured value (index i denotes the control loop)

θ ' _{i, should}

Setpoint, theoretical (index i denotes the control loop)

θ _{i, target, k}

corrected Setpoint (index i denotes the control loop)

Δ

adjusting command

Ap

difference in the pressure level

Claims (18)

Swirl section ( 17 ) in a controlled system ( 02 ) for tempering a component ( 01 ) of a machine, characterized in that the swirling section ( 17 ) has a cross-sectional enlargement, a change of direction and a cross-sectional reduction in direct succession. Swirl section ( 17 ) according to claim 1, characterized in that the swirling section ( 17 ) in a controlled system ( 02 ) for tempering a component ( 01 ) a printing press is arranged. Swirl section ( 17 ) according to claim 1, characterized in that the swirling section ( 17 ) between an entry point ( 16 ) and the component ( 01 ) is arranged. Device for tempering a component ( 01 ) a printing press using a fluid, the temperature of which at a feed point ( 16 ) is changeable, characterized in that in a controlled system ( 02 ) between an entry point ( 16 ) and the component ( 01 ) a swirl section ( 17 ) is arranged. Apparatus according to claim 4, characterized in that the swirling section ( 17 ) has a cross-sectional enlargement, a change of direction and a cross-sectional reduction in direct succession. Swirl section ( 17 ) according to claim 1 or device according to claim 4, characterized in that the swirling section ( 17 ) as a swirl chamber ( 17 ) is executed. Swirl section ( 17 ) according to claim 1 or device according to claim 5, characterized in that when the cross-sectional enlargement increases a cross-sectional area (A1) increases by at least a factor of 2 to a new cross-sectional area (A2). Swirl section ( 17 ) according to claim 1 or device according to claim 5, characterized in that the change in direction is 70 ° to 110 °. Swirl section ( 17 ) according to claim 1 or device according to claim 5 , characterized in that when the cross-sectional area is reduced, a cross-sectional area (A2) is abruptly reduced by a factor of at most 0.5 to a new cross-sectional area (A3). Swirl section ( 17 ) according to claim 1 or device according to claim 4, characterized in that the swirling section ( 17 ) between an entry point ( 16 ) and a first measuring point (M1) for the temperature in the area of an inflow section ( 12 ) is arranged. Swirl section ( 17 ) or device according to claim 10, characterized in that the first measuring point (M1) with respect to a running time of the fluid T _L1 a maximum of 2 seconds from the injection point 16 is located remotely. Apparatus according to claim 4 and 10, characterized in that in the inflow section ( 12 ) a second measuring point (M2) is provided. Device according to claim 12, characterized in that the second measuring point (M2) is farther away with respect to the running time of the fluid T _L2 than halfway from the injection point ( 16 ) to the destination ( 22 ) is arranged. Device according to claim 13, characterized in that measured values (θ ₁ ; θ ₂ ) of the two measuring points (M1; M2) of a common control device ( 21 ) are fed. Swirl section ( 17 ) or device according to claim 6, characterized in that an inlet and outlet area ( 29 ; 31 ) the swirl chamber ( 17 ) are designed in the form of two box-shaped tubes, and an abutting line ( 34 ) the inlet and outlet areas ( 29 ; 31 ) at least in one through the flow directions in the inlet and outlet area ( 29 ; 31 ) formed plane bent (36; 37) are executed. Swirl section ( 17 ) or device according to claim 6, characterized in that the swirl chamber ( 17 ) a tubular inlet and outlet area ( 29 ; 31 ) and an abutting line ( 34 ) the tubular inlet and outlet areas ( 29 ; 31 ) at least in one through the flow directions in the inlet and outlet area ( 29 ; 31 ) formed level bent angularly ( 36 ; 37 ) are executed. Swirl section ( 17 ) or device according to claim 6, characterized in that the swirl chamber ( 17 ) is designed in the geometry of a cuboid, which has an opening ( 32 ; 33 ) for supplying or removing the fluid. Swirl section ( 17 ) according to claim 1 or device according to claim 4, characterized in that the component ( 01 ) as a roller ( 01 ) or cylinder ( 01 ) of a dampening agent-free offset printing unit.