WO2004042214A1

WO2004042214A1 - Electromechanical drive unit for controlling and regulating a butterfly valve used as a flow rate modulator in a pipe

Info

Publication number: WO2004042214A1
Application number: PCT/EP2003/011958
Authority: WO
Inventors: Jörg Hansen; Karl Hörmann
Original assignee: Deutsche Montan Technologie Gmbh
Priority date: 2002-11-02
Filing date: 2003-10-28
Publication date: 2004-05-21
Also published as: EP1893859A1; DE10251116A1

Abstract

The invention relates to an electromechanical drive unit for controlling and regulating a butterfly valve (2) which is provided with a pin and is used as a flow rate modulator in a pipe (1). Said drive unit comprises a rod (5), one end of which is disposed in an oscillator while the other end thereof is connected to the pin (3) of the butterfly valve (2).

Description

Electromechanical drive for controlling and regulating a throttle valve acting as a flow modulator in a pipe

The invention relates to an electromechanical drive for controlling and regulating a throttle valve functioning as a flow modulator with an axis in a tube.

From EP 0 647 348 B1 drives for throttle valves functioning as flow modulators are known. A stepper motor or an electric motor with a return spring are disclosed as drives. These motors directly control the throttle valve axis. The drive with an electric motor is very susceptible to faults because the brushes wear out quickly because it works continuously during start-up. Due to the large masses, the engine cannot move so quickly to achieve the vibration frequencies required for the throttle valve.

For this reason, EP 0 647 348 B1 proposes an electromechanical drive with a rotor and a stator, the rotor being connected directly to the axis of the throttle valve. This makes it possible for the flow modulator to reach frequencies in the order of a few hundred hertz.

The invention is based on the object of providing a drive for controlling and regulating a throttle valve functioning as a flow modulator, which is robust and is inexpensive and which enables higher accelerations by reducing the mass to be moved and thereby a significant increase in the usable frequency range. In addition, the drive should have a low power consumption and enable control of the vibration behavior.

This object is achieved by the characterizing features of claim 1.

Further developments take place according to the characteristics of the subclaims.

The invention is based on the basic idea of providing a drive in which a translatory movement is generated, which is converted into a tilting movement in the region of the axis of the throttle valve.

The translational movement is generated in a vibration generator, in which one end of a rod is set in vibration, the vibration can be generated in the form of an up and down movement or a back and forth movement. This translational movement is converted into a tilting movement in the region of the axis of the throttle valve, the movement being understood to mean an oscillation of approximately 3 to 10 degrees around a rest position. That is, the throttle valve performs a controlled or regulated flutter movement.

A coil with an iron core, to which an active counter bearing is assigned, can be used as the vibration generator. The active counter bearing can be a spring of a coil or a magnet. Pneumatic, hydraulic solutions are also conceivable. Compressible media, e.g. a gel pad is also possible.

According to a further embodiment of the invention, a piezo component, to which a counter bearing is assigned, can be used as the vibration generator. The counter bearing can also be designed as a piezo block.

Depending on whether an up and down movement or a back and forth movement is generated in the vibration generator, the vibration is converted into a tilting movement by the appropriate connections in the region of the axis. During an up and down movement, the rod is supported in such a way that a lever is created and the other end of the rod is connected to the axis of the throttle valve via an eccentric.

Another possibility is to connect the rod to the axis of the throttle valve via gear wheels.

If only low vibration amplitudes of the throttle valve are to be generated, it is also possible to connect the rod directly to the axle.

When the rod moves back and forth, the rod is connected to the axis of the throttle valve via a rocker arm. The tilting movement of the throttle valve can be limited by end stops.

The vibration behavior can be controlled and a targeted influence can be exerted on the vibration behavior by a damping element which is arranged on the rod. This damping element can be designed passively or actively. By actively controlling the damping element, age-related changes can be eliminated.

The following advantages are achieved by the drive according to the invention: only small masses have to be moved. This enables faster movements and accelerations. It is much cheaper than the drives known from the prior art. There are no storage problems. A larger frequency range is possible. The vibration can be influenced in a targeted manner by means of adjustable damping. The drive according to the invention has a low current consumption.

A pipe is to be understood as any pipe through which a fluid flows and whose flow is to be influenced by the throttle valve acting as a flow modulator. This is e.g. B. the case with exhaust pipes. Another application is the intake pipe of an internal combustion engine.

The size, shape, material selection and technical concept of the above-mentioned components as well as the components to be used according to the invention described in the exemplary embodiments are not subject to any special exceptions, so that selection criteria known in the area of application can be applied without restriction.

Further details, features and advantages of the object of the invention emerge from the subclaims and from the following description of the associated drawing, in which — by way of example — preferred exemplary embodiments of the drive according to the invention are shown. The drawing shows:

FIG. 1 shows a schematic illustration of a drive with a vibration generator with up and down movement in a side view,

FIG. 2 shows the drive of FIG. 1 in a top view,

FIG. 3 shows an exemplary embodiment of the vibration generator with piezo components,

FIG. 4 shows an exemplary embodiment of the vibration generator with a coil and a spring,

FIG. 5 shows an embodiment of the vibration generator with two coils,

FIG. 6 shows a schematic illustration of a drive with a vibration generator with a back and forth movement,

Figure 7 shows another embodiment of the drive with a vibration generator with a back and forth movement and

Figure 8 shows an embodiment of the drive with a gear.

1 shows a tube 1 in which a throttle valve 2 with an axis 3 is arranged. On the axis 3, an eccentric 4 is attached, which is connected to a rod 5. The rod 5 is stored in a bearing 6. The other end of the rod 5 is located in a vibration generator which consists of a coil 8 with an iron core 9 and a coil 10 with an iron core 9a and a spring 11. An oscillation of the rod 5 is generated by the oscillation generator. These up and down Vibration is transmitted to the throttle valve 2 via the eccentric 4. The vibration behavior can be specifically influenced by a damping element 7.

The bearing 5 balances the rod 5 such that the vibration generator only has to work against the damping of the damping element 7. This mass distribution enables high accelerations / speeds.

Figure 2 shows the drive of Figure 1 in plan view. The reference symbols have the same meaning as in FIG. 1. The throttle valve 2 with the axis 3 is arranged in the tube 1. The axis 3 is mounted outside of the tube 1 in a bearing 12. The damping element 7 can be regulated by a controller 13. A regulator 14 regulates the vibration generator.

FIG. 3 shows an oscillation generator for the up and down movement. The rod 5 is located at one end between two piezo components 20 and 21, which cause the rod 5 to oscillate up and down.

It can be seen from FIG. 4 that the rod is caused to oscillate up and down by a coil 8 with an iron core 9 and a spring 11 as an active counter bearing.

FIG. 5 shows a vibration generator for the up and down movement with a coil 8 with an iron core 9 and a coil 10 with an iron core 9a as an active counter bearing.

FIG. 6 shows a vibration generator for a back and forth movement. A coil 23 and a coil 24 generate a magnetic field, by means of which a magnet 25, which is connected to the rod 5, can be set in vibration. The rod 5 is held by springs 26 and 27 and possibly dampened in the vibration. The back and forth vibration of the rod 5 is transmitted to the throttle valve via a rocker arm 28 which is fastened to the axis 3 of the throttle valve 2. The rocker arm converts the translatory movement into a rocking movement. The tilting movement is limited by an end stop 29. FIG. 7 shows an oscillation generator for the back and forth movement. The piezo block 20 with the spring 26 causes the rod 5 to oscillate back and forth, which is thus transmitted via the rocker arm 28 as a rocking movement to the throttle valve 2, which is not shown. On the rod 5, a damping element 30 is arranged, which also serves as a guide sleeve.

FIG. 8 shows a vibration generator 31 for the back and forth movement. The rod 5 is designed in the region of the axis 3 as a rack 32. The rack 32 engages in a gear 33 which is fixed on the axis 3. The back and forth movement or the tilting movement is limited by end stops 34 and 34a.

LIST OF REFERENCE NUMBERS

1 pipe

2 throttle valve

3 axis

4 eccentrics

5 bars

6 storage

7 damping element

8 spool

9 iron core

9a iron core

10 spool

11 spring

12 storage

13 controller damping

14 controller vibration

20 piezo component

21 piezo component

23 coil

24 coil

25 magnet

26 spring

27 spring

28 rocker arm

29 end stop

30 damping element (guide sleeve)

31 vibrators

32 rack

33 gear

34 end stop

34a end stop

Claims

claims

1. Electromechanical drive for controlling and regulating a throttle valve (2) functioning as a flow modulator with an axis (3) in a tube (1), characterized in that a rod (5) is arranged at one end in a vibration generator and the other end the rod is connected to the axis (3) of the throttle valve (2).

2. Drive according to claim 1, characterized in that a coil (8) with an iron core (9), which is assigned an active counter bearing, is provided as the vibration generator.

3. Drive according to claim 2, characterized in that the counter bearing is designed as a spring (11).

4. Drive according to claim 2, characterized in that the counter bearing is designed as a coil (16) with an iron core (9a).

5. Drive according to claim 2, characterized in that the counter bearing is designed as a magnet.

6. Drive according to claim 1, characterized in that a piezo component (20), to which an active counter bearing is assigned, is provided as the vibration generator.

7. Drive according to claim 6, characterized in that the counter bearing is designed as a piezo block (21).

8. Drive according to one or more of claims 1 to 7, characterized in that the rod (5) has a bearing (6) and is connected via an eccentric (4) to the axis (3) of the throttle valve (2).

9. Drive according to one or more of claims 1 to 7, characterized in that the rod (5) via gears with the axis (8) of the throttle valve (2) is connected.

10. Drive according to one or more of claims 1 to 7, characterized in that the rod (5) is connected directly to the axis (10) of the throttle valve (2).

11. Drive according to one or more of claims 1 to 10, characterized in that the rod (5) via a rocker arm (28) with the axis (3) of the throttle valve (2) is connected.

12. Drive according to claim 11, characterized in that the rocker arm (28) has at least one end stop (29).

13. Drive according to one or more of claims 1 to 12, characterized in that a damping element (7) is arranged on the rod.