Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified load or strain transmission device from specimen...
Reexamination Certificate
2002-02-07
2003-09-09
Noori, Max (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified load or strain transmission device from specimen...
C073S761000
Reexamination Certificate
active
06615670
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a high-speed rotation testing apparatus, and in particular, to a high-speed rotation testing apparatus preferably used to check the performance and strength of a rotating member of a mechanical element of an apparatus for airplane engines, heavy electrical equipment, grinding stones, generators, ships, automobiles, etc.
2. Description of the Related Art
Conventional high-speed testing apparatuses will be described. The high-speed rotation testing apparatus generally tests industrial products (for example, fans and other rotating members) that are rotated during operation. The high-speed rotation testing apparatus rotates a test object at a rotation speed rated for the operation of the test object to test the reliability thereof under these conditions.
Further, in addition to the check on the rated rotation of the test object prior to incorporation into the actual machine described above (such as an airplane engine), the high-speed rotation testing apparatus is used for various other applications depending on its object, including checks on the safety during overspeed, checks on the rupture strength exhibited when centrifugal stress is forcibly applied, checks on the fatigue strength exhibited when the rotation speed is alternately increased and reduced for a long time (cycle test), tests in which the test object is permanently distorted, and tests in which a distortion gauge is stuck to the test object to measure the stress and distortion during rotation. Accordingly, this apparatus is essential in the industrial fields that use high-speed rotating parts. Recent high-speed rotation testing apparatuses mainly use two types of drive sources for rotation: one of these types uses an air turbine, and the other is based on a gear speed-increase motor driving method that uses a driving motor.
FIG. 5
shows a part of a high-speed rotation testing apparatus based on the air turbine method. The high-speed rotation testing apparatus
100
comprises an air turbine
102
that is rotated by receiving compressed air from a compressor
101
, a support shaft
103
holding a test object S and is rotated by receiving torque applied by the air turbine
102
, a storage section
105
that stores the test object S, supported by the support shaft
103
, and a damper
107
for the support shaft
103
. The test object S is an object shaped like a rotating member which has its durability under high-speed rotation tested as described previously.
The air turbine
102
comprises a casing
104
rotatably storing and supporting a rotor
106
. Compressed air from the air compressor
101
blows against a bucket portion of the rotor
106
to apply a rotational force to the rotor
106
. Thus, the rotor
106
outputs torque.
On the other hand, the casing
104
and the storage section
105
are integrated together. The casing
104
supports the rotor
106
so that when the casing
104
and the storage section
105
, integrated together, are placed on a horizontal surface, the rotational center line of the rotor
106
is arranged toward the vertical direction of the apparatus. Further, the rotor
106
is concentrically fixed (connected) to the support shaft
103
.
Furthermore, the test object S is held at the lower end of the support shaft
103
. The support shaft
103
has a holding mechanism (not shown) provided at the lower end thereof. The holding mechanism fixes the rotating-member-shaped test object S concentrically to a rotating shaft at the rotational center of the test object S by, for example, bolting or screwing. Thus, the test object S rotates with the support shaft
103
.
With this construction, when the compressor
101
is activated, the support shaft
103
and the test object S are rotated with the rotor
106
. Then, the flow of compressed air from the compressor
101
is controlled so that the rotation speed of the test object S has the target value. Then, high-speed rotation tests are carried out for a predetermined time.
FIG. 6
shows a part of a high-speed rotation testing apparatus
200
using a driving motor as a drive source. The high-speed rotation testing apparatus
200
comprises a driving motor
201
, a gear train
202
rotated by the driving motor
201
, a support shaft
203
holding the test object S and is rotated by receiving torque from the gear train
202
, a casing
204
for supporting the driving motor
201
, the gear train
202
, and the support shaft
203
, a storage section
205
that stores the test object S supported by the support shaft
203
, and a damper
210
for the support shaft
203
.
The casing
204
and the storage section
205
are integrated together. The casing
204
supports the driving motor
201
so that when the casing
204
and the storage section
205
, integrated together, are placed on a horizontal surface, a rotor shaft
201
a
of the driving motor
201
is arranged toward the vertical direction of the apparatus. The gear train
202
comprises a driving gear
206
and a driven gear
207
driven thereby. A support shaft
206
a
of the driving gear
206
is connected to the rotor shaft
201
a
, and a support shaft
207
a
of the driven gear
207
is fixedly and concentrically connected to the support shaft
203
. The casing
204
supports the support shafts
206
a
,
207
a
, and
203
so that these shafts are arranged toward the vertical direction. The gear train
202
also serves to increase a rotation speed transmitted from the driving motor
201
to the support shaft
203
. In the high-speed rotation testing apparatus
200
shown in
FIG. 6
, the gear train
202
is illustrated to be composed only of spur gears but may be composed of other various gears such as planetary, helical, and bevel gears. Alternatively, instead of the gear train, a belt may be used to transmit torque and increase the rotation speed.
Furthermore, the test object S is fixed at the lower end of the support shaft
203
via the above described support shaft
103
and a holding mechanism (not shown). Thus, the test object S rotates with the support shaft
203
.
With this construction, when the driving motor
201
is rotated, the support shaft
203
and the test object S are rotated by the gear train
202
. Then, the driving motor
201
is controlled so that the rotation speed of the test object S, achieved via the gear train
202
, has the target value. In this manner, high-speed rotation tests are conducted as in the case with the high-speed rotation testing apparatus
100
.
Long-time cyclic operation (the rotation speed of the rotating member is alternately set for an upper and a lower limit values) intended to check the fatigue strength of a rotating member represented by an airplane engine has recently frequently been performed in every field, for example, in the fields of research and trial production and product shipment. To such long-time tests, it is important to reduce tests costs and improve the maintainability of the testing apparatus.
The above described high-speed rotation testing apparatus
100
using the air turbine
102
allows easy maintenance owing to the simplified structure of the air turbine. Further, the high-speed rotation testing apparatus
100
must use the compressor
101
because compressed air is required to drive the air turbine. In this case, the rotor of the air turbine rotates using air as a medium, so that energy is prone to be lost when compressed air blows against the rotor to apply rotational force to the rotor. Accordingly, the air compressor
101
must provide about 37-kW power even for small-sized high-speed rotation testing apparatuses and 300-kW or more power for large-sized high-speed rotation testing apparatuses. Consequently, the high-speed rotation testing apparatus
100
disadvantageously consumes a huge amount of power for the above described tests requiring a long-time continuous operation. Further, since the compressor
101
generates heat, it is disadvantageously difficult to operate the high-speed rotation testing apparatus for a long time. Furtherm
Shibasaki Koji
Shibasaki Shiro
Watabe Takeshi
Greenblum & Bernstein P.L.C.
Maruwa Electronic Inc.
Noori Max
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