JPH01200002A - Balance confirming device for turborotating machine - Google Patents

Abstract

PURPOSE:To make the unbalance of a turborotating machine easily detectable with an acceleration sensor by fixing a half-built-up turborotating machine to a mounting housing on a base and injecting air through a nozzle of said mounting housing to rotate the turbo-rotating machine. CONSTITUTION:An annular mounting housing 6 is fixed on the rotating center of a machine base 5 freely rotating within the horizontal surface. A turbin wheel 31 of a half-built-up turbo supercharger 30 is inserted into the inside of the mounting housing 6, with its turbin shaft 32 being horizontallized. To confirm the balance of the turbo supercharger 30, air is injected through a nozzle 12 to rotate the turbo supercharger 30. If the turbosupercharger 30 is unbalanced, then, the machine base 5 vibrates within the horizontal surface, and this vibration is detected by an acceleration sensor 24. The detection signal from the acceleration sensor 24 is further input to a control confirming device 52 through a vibrometer 51 to confirm whether it is well balanced or not.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a balance checking device for a turbo rotary machine having a turbine wheel and rotating at high speed, mainly for a turbo supercharger.

The rotating body of a turbo rotating machine rotates at high speed, and in particular, the turbine rotor of a turbo supercharger is a very high speed rotating body, so it is necessary to maintain a precise dynamic balance.

However, due to compatibility and manufacturing cost issues, in the past, each member of the rotating body, such as the turbine wheel, compressor impeller, etc., was precisely balanced individually, and rebalancing was not done during assembly.

However, the assembly may later become slightly unbalanced due to phase shifts, dust, etc.

Therefore, an example of a device for correcting the balance of a turbo rotary machine in a semi-assembled state has been proposed (Japanese Patent Laid-Open No. 62-91629).

On the same side, a semi-assembled turbo rotating machine is mounted on a displacement detection stand equipped with multiple displacement gauges, and the displacement at multiple positions of the high speed rotating body is detected by phase detection means provided in relation to the axis of the high speed rotating body. The generated phase is detected, and the amount of unbalance and the direction in which it occurs are detected from the phase and the amount of displacement to correct the balance.

Since the assembly corrects the dynamic balance of the high-speed rotating body in its current state, the accuracy of the balance is maintained as is during actual use.

However, in the case of the same side, a special displacement detection table is required, and the movement of the same displacement detection table is detected by multiple displacement meters, and
A phase detection means detects the phase in which a displacement occurs, and these are integrated to detect the amount of unbalance and the direction in which it occurs. Complex processing is performed under a complicated detection mechanism, and it is difficult to actually mass-produce it. It was extremely difficult to use at work sites such as the United States, and was expensive.

In addition to this, for items that require correction, balance correction work must be performed and balance inspection must be performed again, which also causes a reduction in work efficiency.

If the balance of each individual turbo rotating body is sufficiently corrected, there is a low probability that it will become unbalanced when assembled, and it will be necessary to correct the unbalance.

There is not much merit in using a complicated detection mechanism to detect the direction of occurrence, and on the contrary, the demerit of adversely affecting work efficiency is greater.

The present invention has been made in view of the above, and its purpose is to provide a balance confirmation device that can easily confirm the balance of a rotating body in an assembled state using a simple mechanism. It is in the point of doing.

In other words, the present invention provides a machine base that is rotatable in a horizontal plane, an acceleration sensor provided at the tip of an arm extending from the machine base in a centrifugal direction, and a semi-assembled sensor mounted on the rotation center of the machine base. A turbo comprising: a mounting housing that supports a turbo rotary machine with its turbo rotating shaft horizontal; a turbine drive nozzle assembled to the mounting housing; and a determining means for determining whether the balance is good or bad based on the detected value of the acceleration sensor. This is a balance confirmation device for rotating machines.

A turbo rotary machine in a semi-assembled state in which the turbo rotating body is supported rotatably is mounted on the mounting housing on the machine base. When air is injected from the nozzle, the turbo rotating body is driven to rotate at high speed.

If the turbo rotating body is unbalanced, the turbo rotating machine causes the machine base to vibrate in a horizontal plane, which can be detected by an acceleration sensor.

The detection value detected by the acceleration sensor differs depending on the degree of unbalance of the turbo rotating body, and the determination means can input this value to determine and confirm whether the balance is good or bad.

Since it is possible to easily check whether the dynamic balance of a turbo rotary machine in a semi-assembled state is good or bad, a turbo rotary machine that passes the test can maintain its balance accuracy during actual use.

The structure is simple and inexpensive, and it is easy to check whether the balance is good or bad, so work efficiency can be improved.

Support 1 Control 3 An embodiment of the present invention illustrated in FIGS. 1 to 4 will be described below.

FIG. 1 is a partially longitudinally sectional side view of the balance checking device and the turbocharger attached thereto in a semi-assembled state, and FIG. 2 is a back view thereof.

A rotating shaft 3 is rotatably provided via a bearing 4 in a vertical direction inside a frame 2 erected on a base 1,
A machine stand 5 is fixed at the upper end of the rotating shaft 3 in parallel to a horizontal plane perpendicular to the rotating shaft 3.

An annular mounting housing 6 is fixed on the rotation center of the machine base 5 with its central axis oriented horizontally.

The mounting housing 6 is fixed to the machine base 5 with a cutout and flattened portion of the lower end thereof aligned with the upper surface of the machine base 5, and an annular frame plate 7 forming an exhaust port on one side.
is attached coaxially.

At the upper end of the mounting housing 6, a circular arc is left on one side and a notch is formed on the other side to form a horizontal surface 6a, and a circular hole 8 is formed by drilling vertically downward in the horizontal surface 6a at a position slightly offset from the center. is provided, and the circular hole 8 reaches the inner peripheral surface of the mounting housing 6.

An air supply pipe 11 is fitted into the circular hole 8 while being supported by a support member 9, and the support member 9 is fixed to the horizontal surface 6a of the mounting housing 6 with screws 10.

A nozzle 12 is formed at the inwardly facing end of the air supply pipe 11, and can inject air vertically downward into the interior of the mounting housing 6 at a position deviated from the center.

A semi-assembled turbo supercharger 30 is attached to the mounting housing 6 having such a configuration, and the mechanism of the supercharger 30 will be briefly described.

The turbocharger 30 in a semi-assembled state is roughly divided into a rotating body and a housing that rotatably supports the rotating body.

The rotating body consists of a turbine wheel 31, a turbine shaft 32 connected to the turbine wheel, and a compressor impeller 33 fixed to the tip of the turbine shaft 32. The rotation center of the compressor 33 is penetrated by the turbine shaft 32, and a nut The tightening is fixed by 34.

The rotating body is supported by the center housing 35, but in actual use, a turbine housing and a compressor housing are installed on both sides of the center housing 35, and the exhaust gas is guided by the turbine housing. When the air flows to the turbine wheel 31 and rotates the turbine wheel 31, a compressor impeller 33 rotates within the compressor housing via the turbine shaft 32, compressing the intake air and sending it to the cylinder.

When attached to the present balance checking device, the center housing 35 that supports the turbine shaft 32 of the rotating body and the side plate 36 forming a part of the compressor housing are fitted together and attached to the mounting housing 6 in a semi-assembled state.

The center housing 35 supports the turbine shaft 32 by full float bearings 37 provided at two locations, front and rear.
An oil supply passage 38 for supplying lubricating oil to the center housing 35 is formed in the upper part of the full float bearing 37.
It communicates with the opening on the top surface of.

A space is formed below the full float bearing 37 and communicates with a discharge port 39 on the lower surface of the center housing 35 .

The supplied lubricating oil is discharged from the discharge port 39 through the space below.

The side plate 36 is positioned to cover the back of the compressor impeller 33 and is fitted into the center housing 35, with the turbine shaft 32 passing through the inside thereof.

With the turbo supercharger in a semi-assembled state as described above, with the turbine shaft 32 horizontal, the turbine wheel 31 is inserted into the mounting housing 6, and the outer periphery 7 flange portion 35a on the turbine wheel 31 side of the center housing 35 is attached to the mounting housing. The turbo supercharger is fixed to the mounting housing 6 by fitting into the outer circumferential edge 6b that protrudes in the axial direction of the turbo supercharger 6 and tightening the bolts 41 at several locations via the stoppers 40.

On the other hand, the turbine shaft 32 is
An arm member 20 extends parallel to the side plate 36, and the arm member 20 is bent upward beyond the side plate 36, and further bent horizontally in front of the compressor impeller 33 to form a tip portion 20a.
It is said that

m support rods 21 are fixed vertically to the tip 20a, and support a rotational speed detection sensor 22 provided at the upper end of the support rods 21.

The sensor 22 is located close to the bottom of the nut 34 and is located at a reflective portion provided at one location on the outer periphery of the nut 34 or on the nut 34.
The rotation speed of the rotating body can be detected by detecting the gap in the hexagonal part of the rotor.

A base end portion of a support plate 23 is fixed to the lower surface of a horizontal portion of the arm member 20 extending from the machine base 5, and an acceleration sensor 24 is fixed to a distal end portion extending roughly in the centrifugal direction.

Therefore, a semi-assembled turbocharger 8130 is fixed to the machine base 5 which is rotatably supported in a horizontal plane around the rotating shaft 3 via the mounting housing 6, and a senna turbocharger 8130 is fixed via the arm member 20. 22, the acceleration sensor 24 is in an integrally fixed state.

When performing a balance confirmation test, check the center housing 3.
A refueling nozzle 13 at the tip of a refueling pipe extending from the refueling pump is fitted into an opening communicating with the refueling passage 38 on the upper surface of the fuel pump 5 , and a discharge pipe 14 is disposed below the discharge port 39 .

An air supply pipe (not shown) is fitted into the support member 9 at the upper end of the mounting housing 6 so that air can be injected from the nozzle 12 through the air supply pipe 11.

FIG. 3 shows a block diagram of the control system of this embodiment.

A detection signal from the rotation speed detection sensor 22 is input to a tachometer 50 to calculate the rotation speed, and the calculation result is input to a control confirmation device 52 which is a computer.

Similarly, the detection signal from the acceleration sensor 24 is input to the vibration meter 51 to calculate the acceleration, and the result is also input to the control confirmation device 52.

Further, the control confirmation device 52 controls an air control valve 53 that regulates high-pressure air supplied to the turbine drive nozzle 12, and also controls an oil supply pump 54 that sends lubricating oil to the full float bearing 37.

A circulation system is formed such that the lubricating oil is supplied to the full float bearing 37 and then discharged from the discharge port 39 to the discharge pipe 14, and then pumped up again by the oil supply pump 54 and supplied to the full float bearing 37.

The working procedure for actually carrying out a balance confirmation test under the above-mentioned mechanism will be explained based on the flowchart shown in FIG. 4.

First, the date is input in the control confirmation device 52 (step ■), then the specific number of the turbocharger is input (step ■), and then the turbocharger 30 is set in the mounting housing 6 (step ■), ! Furthermore, set the oil supply nozzle 13 in the center housing 35 (Step ■)
, complete the preparation.

Then press the start button (not shown) (step ■)
, high-pressure air is injected from the nozzle 12 provided in the mounting housing 6 to rotate the turbine wheel 31 (step (2)).

The air control valve causes the turbocharger 30 to rotate at a high speed of tens of thousands of revolutions per minute, and the acceleration at this time is measured by a vibration meter 51.
(Step ■), and perform a comprehensive judgment of the dynamic balance (Step ■).

If the rotating body consisting of the turbine wheel 31, turbine shaft 32, and compressor impeller 33 is unbalanced when attached to the center housing 35, it will cause vibration when rotated at high speed, and among these vibrations, the upper and lower The turbo supercharger 30 is mounted on the machine base 5, which is only allowed to rotate in the horizontal plane.
Since is fixed, v1 is suppressed and only vibrations in the horizontal plane appear as rocking vibrations about the rotating shaft 3.

When the balance of each individual item is corrected, the cause of unbalance is a phase shift in assembling the compressor impeller 33 to the turbine shaft 32 or a nut 34.
It is possible that dirt got caught during tightening.

The acceleration sensor 24' detects the vibration caused by this imbalance, and the vibration meter 51 measures the acceleration G value of the vibration. If this G value is less than a certain value, the dynamic balance of the turbo supercharger 30 is judged to have passed. If the value exceeds a certain value, it is determined to be a failure.

The judgment result is printed out (step ■).

Then, in the next step ■, the drive is stopped and the refueling nozzle 13
Then, the turbocharger 1130 is removed from the mounting housing 6 (step @), and the presence or absence of the next test machine is determined (step @).

If there is no next device under test, it will end, if there is, step ■
Return to , enter the specific number again, and proceed according to the steps.

The time required for one cycle is extremely short, less than 50 seconds, and since the dynamic balance can be confirmed accurately in such a short time, work efficiency can be greatly improved.

In general, if the balance of each component of the rotating body, such as the turbine wheel 31, turbine shaft 32, and compressor impeller 33, is corrected in advance, there is a low probability that the assembly will become unbalanced. It is more advantageous to increase work efficiency through simple confirmation work than to perform balance correction work.

Furthermore, the mechanism is simple and easy to handle, and costs can be reduced.

According to the present invention, the quality of the dynamic balance can be accurately confirmed in a short time using a simple mechanism, thereby improving work efficiency.

Furthermore, the mechanism is simple, the handling is extremely easy, and the cost is low.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal side view of a balance confirmation device according to an embodiment of the present invention and a turbocharger attached thereto in a semi-assembled state, Fig. 2 is a back view of the same, and Fig. 3 is a control system. The block diagram and FIG. 4 are flowcharts showing the working procedure in the same embodiment. 1... Base, 2... Frame, 3... Rotating shaft, 4...
・Bearing, 5...Machine base, 6...Mounting housing, 6a...Horizontal surface, 6b...Outer periphery, 7...Frame plate, 8...Circular hole, 9...Supporting member , 10...screw,
DESCRIPTION OF SYMBOLS 11...Air supply pipe, 12...Nozzle, 13...Refueling nozzle, 14...Discharge pipe, 20...Arm member, 21...Support rod, 22...Sensor, 23... - Support plate, 24... Acceleration sensor, 30... Turbo supercharger, 31... Turbine wheel, 32... Turbine shaft, 33... Compressor impeller, 34... Nut, 35... ...Center housing, 35a...Flange part, 36...Side plate, 31...
・Full float bearing, 38...Oil supply path, 39・
・・Discharge port, 40・stopping metal, 41・・bolt, 5
0... Tachometer, 51... Vibration meter, 52... Control confirmation device, 53... Air control valve, 54 River oil pump.

Claims (1)

[Claims] A machine base that can freely rotate in a horizontal plane, an acceleration sensor installed at the tip of an arm member extending from the machine base in a centrifugal direction, and a turbo rotary machine in a semi-assembled state installed on the rotation center of the machine base. A turbo comprising: a mounting housing that horizontally supports a turbo rotating shaft; a turbine drive nozzle assembled to the mounting housing; and a determining means for determining whether the balance is good or bad based on the detected value of the acceleration sensor. Balance confirmation device for rotating machines.