EP2217901A2

EP2217901A2 - Device for dynamically measuring the imbalance of the rotor of a turbocharger

Info

Publication number: EP2217901A2
Application number: EP08856694A
Authority: EP
Inventors: Dieter Thelen; Jürgen LEHMANN
Original assignee: Schenck RoTec GmbH
Current assignee: Schenck RoTec GmbH
Priority date: 2007-12-04
Filing date: 2008-12-02
Publication date: 2010-08-18
Also published as: WO2009071521A3; BRPI0816361A2; DE102007058592A1; WO2009071521A2; US20100269588A1; CN101836098A; MX2010005616A; JP2009139367A

Abstract

The invention relates to a device for dynamically measuring the imbalance of a turbocharger rotor rotatably supported in a housing segment (6), said device comprising a support device (3) having a spring element whereon the housing segment (6) can be mounted, such that it has at least two degrees of freedom for vibrating relative to the support device, a turbine housing (4) mounted on the support device (3) and having a channel designed for feeding a drive fluid and for impinging the drive fluid on the turbocharger rotor, wherein a free space is located between the turbine housing (4) and the housing segment (6), a measurement transducer for measuring the vibrations of the housing segment (6), an automatic coupling device (9) having a displaceable holder, a connecting part (10) held by the holder and thereby displaceable toward the housing segment (6), and at least one displaceable coupling element, by which the connecting part (10) can be coupled to the housing segment (6), wherein the coupling device (9) can be moved into a position in which the at least one coupling element coupling the connecting part (10) to the housing segment (6) can be displaced relative to the holder such that the coupled connecting part (10) can freely vibrate with the housing segment (6).

Description

DEVICE FOR DYNAMICALLY MEASURING THE BALANCING OF THE ROTOR OF A TURBOCHARGER

The invention relates to a device for dynamically measuring the imbalance of a turbo-engine, comprising a turbine wheel and a compressor wheel, which are arranged on a rotatably mounted in a housing portion shaft, comprising a support device having at least one spring element on which the housing portion is fastened in such a way in that it has at least two degrees of freedom for swinging relative to the carrier device, a turbine housing fixed to the carrier device with a channel adapted to supply a drive fluid and to act on the turbo-motor with the drive fluid, wherein a clearance is provided between the turbine housing and the housing portion , and at least one arranged on the support device sensor for detecting the vibrations of the housing portion.

A device of the type mentioned is known from WO 2007/054445 A1. It serves to measure the unbalance of turbo engines for exhaust-driven turbochargers, to achieve the highest possible accuracy only a so-called turbocharger fuselage group, which consists of the turbo rotor and a bearing housing of the turbo engine housing section is inserted into an unbalance measuring device and the unbalance measuring device missing and required housing parts by analogously designed device parts, such as a turbine housing replaced. As a result, the resonant mass of the spring-mounted measurement setup can be kept small and negative influences due to the mass on the imbalance measurement can be reduced. The rotor imbalance is preferably measured at an angular velocity of the turbo-engine corresponding to substantially the normal operating speed, wherein the turbine wheel of the turbo-rotor is arranged in a turbine casing of the measuring device and is accelerated to the angular velocity required for the measurement by the application of compressed air. The turbine housing is stationary arranged the device and separated by sufficiently large clearances of the turbocharger body group and the oscillating part of their storage.

To carry out a meaningful and trouble-free measuring run, the coupling of connecting parts to the housing section of the turbocharger body group is necessary or expedient. For example, the storage of the turbo-engine requires a sufficient supply of lubricant as possible under conditions prevailing during normal operation of the turbocharger. Furthermore, it has proved to be advantageous if the compressor wheel is covered by a protective hood for flow guidance through a compressor housing or for reasons of protection, which are to be fastened to the housing section. The attachment of such connections by hand is cumbersome and time consuming.

The invention has for its object to provide a device of the type mentioned, which allows automatic connection of a turbocharger hull group with connection parts.

The object is solved by the invention defined in claim 1. Advantageous embodiments of the invention are specified in claims 2 to 11.

The device according to the invention is characterized by an automatic coupling device with a movable holder, one held by the holder and by this to the housing section zoom movable connector part and at least one movable coupling element, through which the connector part can be coupled to the housing portion, wherein the coupling device in a position is movable, in which the connecting part to the housing portion coupling at least one coupling element is movable relative to the holder such that the coupled connector can vibrate freely with the housing portion. By means of the device according to the invention, a connection part required for the measuring run for unbalance measurement with the turbocharger tubing group, for example a lubricant line for supplying the rotor bearing with lubricant, can be automatically coupled to the housing section and vice versa also be separated from the housing section, at the same time ensuring is that the coupling device in the for the

Measuring position determined the freedom of movement of the coupled

Connection part and also of the housing section does not restrict and unbalance induced vibrations can unfold undisturbed.

In an advantageous embodiment of the invention, the coupling element may be a U-shaped spring clip, which is movable in a clamping position encompassing the housing portion and by which the connecting part to the housing portion with a defined force is pressed. This embodiment is primarily suitable for the connection of a lubricant line in which it is pressed by means of the spring clip radially to the axis of rotation of the connecting piece of the housing portion. Usually, the housing section forming the bearing housing is provided with a lubricant inlet opening and a lubricant outlet opening, wherein the openings are arranged on opposite sides of the housing section. The U-shaped spring clip according to the invention is suitable here for the simultaneous connection of a lubricant supply line and a lubricant drain line by each leg of the spring clip is provided with a correspondingly suitable connector.

The coupling of the spring clip can be effected according to a further proposal of the invention in a simple manner, that the legs of the spring clip are held on the arms of a spreading forceps and that the spreading forceps by a drive in a spread apart the legs open position and the spring clip on the housing portion coupling the closed position is movable, wherein the arms in the closed position in such a way - A -

can be positioned relative to the legs, that the spring clip can follow vibrations of the housing portion unhindered. In this case, the spring clip is held in the closed position by the spring force pressing on the connection part and the corresponding reaction force on the housing section.

Preferably, loops are arranged on the arms of the spreading forceps, which surround the legs of the spring clip and have a loop opening which is larger than the encompassed cross section of the legs. In the closed position of the spreading forceps, the holding straps are positioned so that they no longer rest against the legs of the spring clip.

According to a further advantageous embodiment of the invention can be provided as a coupling element arranged on the connector closure with a movable by a holder arranged on the drive locking pin, the drive is separable from the locking pin when the locking pin is in the terminal part coupling the clamping position , This embodiment is particularly advantageous for coupling a compressor housing in order to connect it to a flange of the housing section. In this case, the compressor housing preferably has three closures arranged at regular intervals at its circumference.

The invention will be explained in more detail below with reference to an embodiment (s) shown in the drawing. Show it

Figure 1 is a perspective view of an unbalance measuring device according to the invention, Figure 2 is a first view of a first for coupling Zulauf- and

Drain lines certain coupling device of the unbalance measuring device according to Figure 1, FIG. 3 shows a second view of the coupling device according to FIG. 2,

Figure 4 is a sectional view of a second for coupling a

Compressor housing certain coupling device of

FIG. 5 shows a first perspective view of the coupling device according to FIG. 4, FIG. 6 shows a second perspective view of the coupling device according to FIG. 4 and FIG

Figure 7 shows a detail of the coupling device according to Figure 4 in the coupled disconnected position.

The unbalance measuring device 1 shown in Figure 1 is intended for measuring the imbalance of the turbo rotor turbocharger group 2 and has a fixed to a rigid base 3 turbine housing 4, which is connectable to drive the turbo rotor with a compressed air source. A tensioning device 5 for tensioning a housing section 6, in which the turbo-rotor of the turbocharger body group 2 is mounted, is fastened to the turbine housing 4 by means of spring bars. On the side facing away from the turbine housing 4 side of the clamping device 5, a first coupling means 7 is arranged, which serves for the automatic coupling of a supply line and a drain line to the housing portion 6. The coupling device 7 is arranged on a holder 8 which is movable transversely to the axis of rotation of the turbocharger body group 2. In addition to the coupling device 7, a second coupling device 9 is shown, by means of which a compressor housing 10 can be coupled to the housing section 6 automatically. The coupling device 9 is held on a drive device, not shown, by which it is removable in the direction of the axis of rotation of the turbocharger body group 2.

Figures 2 and 3 show the first automatic clutch device 7, which is intended for coupling a supply line 11 and a drain line 12 to a turbocharger fuselage group 2. The coupling device 7 has a Holder 8, which is held and guided rectilinearly movable on a guide rail 14. The guide rail 14 is fixed to a stationary part of an unbalance measuring device in a horizontal orientation. By drilling the guide rail 14, two parallel rods 15 extend, through which the holder 8 is connected to a working cylinder, not shown. By actuating the working cylinder, the holder 8 can be moved along the guide rail 14.

On the holder 8, a clamp carrier 17 of a pneumatically actuated spreading forceps 18 is fastened by means of screws. The spreading forceps 18 has two parallel arms 19, 20, which extend transversely to the forceps support 17 and are secured to retaining plates 21, 22, which are held longitudinally movable on the forceps support 17. The holding plates 21, 22 are interconnected by a pneumatic cylinder 23. The mobility of the holding plates 21, 22 is limited in both directions of movement by stop elements 24, 25, 26, 27, which are adjustably fastened by means of screws on the forceps support 17. At the free ends of the arms 19, 20 U-shaped loops 28, 29 are fixed, which extend at right angles to the arms 19, 20 to each other.

In the loops 28, 29, a U-shaped spring clip 30 with legs 31, 32 mounted. The legs 31, 32 are inserted through the loops 28, 29 and resiliently biased in the direction of the ends of the loops 28, 29 and thereby hold the spring clip 30 in the position shown in Figure 1 to the loops 28, 29 fixed. At the free ends of the legs 31, 32, which are located on the side facing away from the forceps support 17 side of the loops 28, 29, tubular connecting elements 33, 34 are attached. The connecting elements 33, 34 are provided at their mutually facing end sides with a suitable connection profile and sealing elements to ensure a tight connection to a housing portion 40 of a turbocharger body group 2. The connecting element 33 is connected to the flexible supply line 11. The connecting element 34 protrudes with a pipe section 38 into the drain line 12. The outer diameter of the pipe section 38 is smaller than that Inner diameter of the drain line 12, so that there is a free annular space between the two, which prevents the coupled to the turbocharger group 2 connecting element 34 abuts the drain pipe when the turbocharger body group 2 oscillates in a measuring run. The tube of the drain line 12 is held by an elbow 39 which is fixedly connected to the holder 8.

For the insertion of a turbocharger hull group 2 into the balancing device, the holder 8 with the spreading spreader 18 arranged thereon is moved transversely to the rotational axis of the subsequently used turbocharger hull group 2 into a retracted position, so that the spreading spreader 18 does not hinder the insertion of the turbocharger hull group 2 into the device. In addition, the pneumatic cylinder 23 is driven to move apart the arms 19, 20 until it rests against the stop elements 24, 27. The spring clip 30 which is held on the arms 19, 20 is thereby elastically bent, wherein the connection elements 33, 34 receive a distance which is greater than the outer diameter of the housing section 40 of the turbocharger body group 2 in the area of the connection pipe 42 provided for the connection of the inlet line and the outlet line , 42.

After the turbocharger hull group 2 is inserted into the unbalance measuring device and clamped by a tensioning device in a predetermined position, the spring clip 30 is moved by moving the holder 8 in the direction of the turbocharger hull group 2 into a position in which it surrounds the turbocharger hull group 2 such that the connection elements 33 , 34 are aligned coaxially with the connecting pieces 41, 42. This position may be determined by an adjustable positioning stop on the guide rail 14, which limits the movement of the holder 8. Alternatively, measuring sensors can also be provided which detect the position of the housing section 40 relative to the spreading forceps18. To connect the connecting elements 33, 34, the arms 19, 20 are moved by actuation of the pneumatic cylinder 23 to each other, wherein the legs 31, 32 by the spring force of Federbügels 30 are compressed and finally the connecting elements 33, 34 press against the connecting piece 41, 42 of the housing portion 40. The spring force of the spring clip 30 is in this case dimensioned so large that the spring clip 30 presses the connecting element 33 against the pressure of the supplied via the feed line 11 lubricant pressure-tight manner to the connecting piece 41. After the spring clip 30 has been coupled to the housing section 40, the arms 19, 20 travel a little further until they reach their end position on the stop elements 25, 26. As a result, the loops 28, 29 lift from the legs 31, 32 of the spring clip 30 and create a clearance between the two legs 31, 32 and the inner sides of the loops 28, 29, so that the spring clip 30 in the openings of the loops 28, 29 can move freely when he swings together with the turbocharger hull group 2 during the measurement run. Only via the flexible supply line 11, a connection between the stationary part of the unbalance measuring device and the spring clip 30 remains. However, the supply line 11 is sufficiently flexible and arranged so that thereby the measuring process is not affected.

FIG. 2 shows the coupling device 7 in the position in which the connection elements 33, 34 are coupled to the turbocharger body group 2. The tensioning device, by which the turbocharger body group 2 is held in the balancing device, has been omitted in FIG. 2 for better visualization of the coupling device 7.

After completion of the unbalance measurement of the described process is repeated in reverse order and thereby the spring clip 30 with the connected lines of the turbocharger body group separated and removed, so that the turbocharger group can be freely removed from the unbalance measuring device.

FIGS. 4 to 6 show a coupling device 9 for the automatic coupling of a compressor housing 10 to a turbocharger body group 2 shown. The coupling device 9 has a plate-shaped holder 47, which is movable by a drive device, not shown, in the direction of the axis of rotation 48 of the turbocharger group 2 between a hired to the turbocharger hull group 2 clutch position and a remote from this loading position back and forth. The holder 47 is aligned at right angles to the axis of rotation 48 and has an axis of rotation 48 concentric opening 49. On the holder 47 are on the side facing the turbocharger group 2 side equidistant from the axis of rotation 48 and at a distance from each other three pneumatic cylinders 50 are attached Piston rods 51 are aligned radially to the axis of rotation 48. At the inner, the rotation axis 48 facing ends 51 gripping sleeves 52 are fixed to the piston rods, which have an undercut, radially open recess 53. In the gripping sleeves 52 locking pins 54 are mounted with their operating ends 55. The actuator ends 55 have a thinner portion projecting from the gripping sleeves 52 through an end opening, and a head remote from the thinner portion disposed in the recess 53 and having a smaller axial length than the recess 53, so that it is in the recess 53 between two end positions in the longitudinal direction movable back and forth. The locking pins 54 belong to locks 56 which are arranged on a ring 57 which carries the compressor housing 10. The locks 56 each have a lock body 58 which is secured to the ring 57 and which has a radial bore in which a locking pin 54 is slidably mounted. Furthermore, the lock bodies 58 contain a ball lock 59 with a spring-loaded ball, which acts in the radial direction on a ramp 60 formed on the lock pin 54. The ramp 60 has such a tendency that the pressing force of the ball tends to move the locking pin 54 radially inwards in the closing direction or to keep it in the closed position. Radially inwardly, the locking pin 54 protrudes from the lock body 58 and its protruding end 61 has a larger diameter than the bore of the lock body 58 and forms an outwardly projecting shoulder which abuts the lock body 58 in the release position shown in FIG limited the release movement of the locking pin 54. On the ring 57 and the peripheral edge of the compressor housing 10 side facing the inner end of the locking pin 54 is provided with a wedge surface.

The piston rods 51 of the pneumatic cylinder 50 protrude with their outer ends 65 radially outward from the pneumatic cylinders 50 and carry a screwed into a threaded bore threaded pin 66 on which a spring plate 67 is adjustably secured by a nut. On the ends 65 compression springs 68 are arranged, on the one hand on the pneumatic cylinder 50 on the other hand on the spring plate 67 can be supported. The length of each compression spring 68 and the position of the associated spring plate 67 are coordinated so that the compression spring 68 is compressed until when coupling the compressor housing 10 to reach the closed position still be covered closing path of the locking pin 54 corresponds to about half the free travel, the Head of the operating end 55 in the recess 53 can cover. The compression springs 68 are therefore shortened when closing the locks 56 only by a length amount corresponding to half the free travel of the locking pin 54 relative to the piston rod 51. The compressed in the locked position by a half the free travel of the locking pin head dimension corresponding compression springs 68 can then spring back into their relaxed length when the pneumatic cylinder 50 are relieved of the actuating pressure and thereby move back the piston rods 51 by the appropriate amount.

In FIG. 4, the coupling device 9 has moved up to the turbocharger body group 2. The turbocharger hull group 2 is in this case held with its flange 62 in the tensioning device 5, not shown, of the unbalance measuring device 1. The coupling device 9 is in the open position, which is intended to approach the turbocharger body group 2. In this

Position the pneumatic cylinder 50 are driven so that the locking pins 54 are retracted to its release position, with their operating ends are loaded with a defined tensile force by the gripping sleeves 52. As a result, the ring 57 and the compressor housing 10 fastened thereto are moved in the direction of rotation. Axis 48 centered position held on the holder 47, so that the compressor housing 10 can be pushed when approaching the turbocharger fuselage group 2 with its receiving bore on a flange 63 of the turbocharger fuselage group 2. When the position shown in Figure 4 is reached, the pneumatic cylinders 50 are actuated in the opposite direction and thereby the locking pins 54 are moved radially inwardly until they abut with their wedge surfaces fixed to the flange 63 of the turbocharger group 2 and thereby the compressor housing 10 and the turbocharger group 2 couple. The heads of the actuating ends 55 are in this case on the radially outer walls of the recesses 53 and are supported radially outwardly of the gripping sleeves 52. The compression springs 68 are stretched.

The position reached so far of the coupling device 9 can not be maintained for a measurement run, since the turbocharger body group 2 is prevented from swinging by the pneumatic cylinder 50 in the blocking position. The pneumatic cylinder 50 are therefore controlled without pressure after closing the clutch device 9. As a result, the compression springs 68 arranged on the outer ends 65 of the piston rods 51 can relax, as a result of which the piston rods 51 are moved radially outward to the extent that the heads of the actuating ends 55 are in a central position in the recesses 53. In this disconnected position shown in Figure 7 is on both sides of the heads and also between the end faces of the gripping sleeves 52 and the locking pins 54, a sufficiently large space for the vibrations occurring during the process of imbalance measurement available. The locking pins 54 are held in this case by the forces of the ball locks and the resulting friction in the locked position.

To uncouple the compressor housing 10, the locking pins are moved back to the position shown in FIG. 4 by actuating the pneumatic cylinders 50. Subsequently, the coupling device 9 with the compressor housing 10 held therein is removed from the turbocharger body group 2.

Claims

Anspruch [en] A device for dynamically measuring the imbalance of a turbo-engine comprising a turbine wheel and a compressor wheel arranged on a shaft rotatably mounted in a housing section, comprising a support device having at least one spring element to which the housing section can be fastened such that he has at least two degrees of freedom for swinging relative to the carrier device, a fixed to the support device turbine housing with a

Channel, which is designed for supplying a drive fluid and for acting on the turbo-motor with the lifting fluid, wherein between the turbine housing and the housing portion, a free space is provided, and at least one sensor for detecting the vibrations of the housing portion, characterized by an automatic coupling device with a movable holder a connection part provided by the holder and movable by the latter to the housing section and at least one movable coupling element, by which the connection part can be coupled to the housing section, wherein the coupling device can be moved to a position in which the connection part is attached to the housing section coupling at least one coupling element is movable relative to the holder such that the coupled connection part can swing freely with the housing portion.

2. Device according to claim 1, characterized in that the connecting part is a housing part for covering the compressor wheel.

3. Device according to one of claims 1 or 2, characterized in that the connecting part is a lubricant line.

4. Device according to one of the preceding claims, characterized in that a U-shaped spring clip is provided with two opposing legs as a coupling element, which is movable in a clamping portion enclosing the housing portion and pressed by the connecting part to the housing portion with a defined force is.

5. The device according to claim 4, characterized in that the legs of the spring clip are held on the arms of a spreading forceps and that the spreading forceps can be moved by a drive in a spread apart the legs open position and the spring clip ankuppelnde closed position, wherein the arms in the closed position can be positioned relative to the legs, that the spring clip can follow vibrations of the housing portion unhindered.

6. Apparatus according to claim 5, characterized in that on the arms of the spreading forceps straps are arranged, which engage around the legs of the spring clip and have a loop opening which is larger than the encompassed cross section of the legs.

7. Device according to one of claims 4 to 6, characterized in that on the legs of the spring clip tubular connection elements are attached to which inlet or outlet lines are connected.

8. The device according to claim 1, characterized in that at least one arranged on the connecting part lock with a locking pin is provided as a coupling element by a on the

Holder arranged drive is movable, the drive of the Locking pin is separable when the locking pin is in the terminal part coupling the clamping position.

9. Apparatus according to claim 8, characterized in that the locking pin is driven by a pneumatically actuable actuating cylinder.

10. Device according to one of claims 8 or 9, characterized in that the connecting part has a ring on which at intervals a plurality of locks with the center axis of the ring aligned locking pins are attached.

11. Device according to one of claims 8 to 10, characterized in that the connection between the locking pin and the pneumatic actuating cylinder in the direction of actuation has a free travel and the actuating cylinder from the closed position by half the free travel is movable into an intermediate position.