JP2001141626A - Thermal fatigue testing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal fatigue testing device that can check the thermal fatigue behavior of a rotary member in fluid with complicated temperature fluctuation. SOLUTION: The thermal fatigue testing device is composed of a rotary test piece, a fluid container for retaining fluid around the rotary test piece, a driving part for rotating the rotary test piece, a fluid supply system for supplying the fluid with different temperature, a device for controlling positioning in the rotary direction of the rotary test piece, and a control part for controlling a thermal fatigue test, thus carrying out the thermal fatigue test where high- cycle thermal fatigue is combined with low-cycle one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for performing a thermal fatigue test of a rotating member in a fluid environment where the temperature fluctuates.

[0002]

2. Description of the Related Art A conventional thermal fatigue test apparatus for a rotating member employs a heating means for heating the rotating member and a cooling water for cooling, as described in Japanese Patent Application Laid-Open No. 55-13858. Was sprayed.

Conventionally, thermal fatigue testing devices which apply a fluid to a fixed and immovable specimen to give a temperature difference are disclosed in Japanese Patent Application Laid-Open Nos. 58-225343, 59-220629 and 59-220629. 59-231435, JP-A-60-117127, JP-A-62-2503
There is No. 30.

Japanese Patent Application Laid-Open No. 61-76934 and Japanese Patent Application Laid-Open No. 62-134540 disclose conventional apparatuses for performing a thermal fatigue test by moving a test specimen into a plurality of spaces having different environments.

[0005]

In the above prior art, the thermal fatigue test apparatus for the rotating member cannot be tested in a fluid environment. An object of the present invention is to enable a thermal fatigue test for a rotating member to be performed in a fluid environment.

Further, in the above-mentioned prior art, a test body is fixed in a test for performing a thermal fatigue test in a fluid environment. It is an object of the present invention to enable a test in a similar environment to be performed on a rotating rotating member.

Further, in the above-mentioned prior art, a mechanism for rotating the test body was not considered in the case where the test body was moved instead of fixedly and the thermal fatigue test was performed. Further, since the environment changes with the movement of the test specimen, the test specimen cannot always be exposed to one kind of fluid. An object of the present invention is to carry out a thermal fatigue test on a rotating specimen while exposing the specimen in a fluid.

Further, in the above prior art, it was not possible to independently control the temperature of the fluid around the test piece and the operation of the test piece. An object of the present invention is to simplify introduction of a fluid into a fluid container so as to make it steady, and to enable independent setting of a temperature of a fluid around a test piece and an operation of the test piece. An object of the present invention is to make it possible to easily perform a complicated thermal fatigue test by programming a body movement.

[0009]

In order to achieve the above object, a rotary member sealed with a fluid container is connected to a motor installed outside the fluid container, and a mark for detecting a position in a rotational direction is attached to the rotary member. In addition, it is possible to detect a rotational direction position of the rotating member by reading a mark for detecting a rotational direction position provided on the rotating member.

[0010] Further, the rotation direction position of the rotating member is always acquired by the control device, and the rotation of the test specimen can be controlled by driving the motor in accordance with the rotating member rotation program preset by the control device.

The fluid container which seals the rotating member can hold the fluid around the rotating member without being affected by the external environment. At this time, by providing a seal portion on a shaft connecting the rotating member and a driving mechanism such as a motor, the fluid in the fluid container does not leak to the outside.

[0012] From a plurality of fluid inlets provided in the fluid container,
By simultaneously introducing fluids having different temperatures, fluids having different temperatures are given to specific positions around the rotating member.
At this time, if the rotating member is rotated, the periphery of the rotating member will be alternately exposed to a plurality of fluids having different temperatures,
A thermal fatigue test controlled by the number of revolutions of the specimen is performed.

[0013] From a plurality of fluid inlets provided in the fluid container,
When the rotation of the rotating member is stopped while fluids with different temperatures are simultaneously introduced, one side of the rotating member becomes hot,
The other side is heated to a low temperature.

From a plurality of fluid inlets provided in the fluid container,
When a rotating member that has been stopped is rotated half a revolution at high speed with fluids of different temperatures being simultaneously introduced, the hot part is rapidly cooled and the cold part is rapidly heated. . At this time, a different thermal strain is generated in the rotating member than during rotation of the rotating member. In order to rotate the rotating member by a half turn, a mark attached to the rotating member for detecting a rotational position and a device which can read the mark and detect the rotational direction position of the rotating member are used.

[0015] From a plurality of fluid inlets provided in the fluid container,
When the rotating member stopped in the above state is rotated at a high speed for half a revolution while simultaneously introducing fluids having different temperatures, the hot portion hitting the opposite side from the previous one is rapidly cooled, and the temperature becomes low. The heated part is rapidly heated. At this time, thermal strains having different directions of tension and compression are generated in the rotating member.

As described above, by combining the rotation, the stop, and the half rotation of the rotating member to the application, the thermal fatigue test according to a predetermined program can be performed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. The rotating specimen 1 is set in an autoclave 2. Water 4 flowing inside the pipe 3 is made into pure water through a filter 5 and an ion exchange resin 6 and stored in a water storage tank 7. Low-temperature pure water 9 is introduced into the low-temperature water pipe 8, and is pumped by a high-pressure metering pump 10. The pumped low-temperature pure water 9 enters the autoclave 2 at a low temperature, and is sent out of the autoclave through the low-temperature water chamber 11 in the autoclave. The sent low-temperature pure water 9 returns to the water storage tank 7 through the cooler 12, the pressure regulating valve 13, and the flow meter 14. The water led to the high-temperature water pipe 15 is pumped by a high-pressure metering pump 16, and is introduced into the autoclave 2 through a heat exchanger 17 and a preheater 18. The high-temperature pure water 20 that has passed through the high-temperature water chamber 19 in the autoclave 2 returns to the water tank 7 through the heat exchanger 17, the cooler 18, the pressure regulating valve 19, and the flow meter 20. The rotation speed of the rotating test body 1 and the output of the heater 18 can be controlled by the control device 21. Rotating specimen 1
Is in contact with the high-temperature pure water 20 in the high-temperature water chamber 19, and the opposite side of the rotating test body 1 is in contact with the low-temperature pure water 9 in the low-temperature water chamber 11. The rotating specimen 1 is controlled by the control device 21
When the rotation is performed by a command, a predetermined portion of the surface of the rotating specimen 1 is alternately exposed to high-temperature water and low-temperature water, and a repeated thermal strain is generated. it can.

The heater 18 is controlled by the control device 21.
, The temperature of the high-temperature pure water 21 can be set to a predetermined value, so that the temperature difference given to the surface of the rotating test body 1 can be set to a predetermined value. By controlling the number of revolutions of the rotating specimen 1, the frequency of the temperature fluctuation can be adjusted to the number of revolutions of the rotating specimen 1
By controlling the temperature, the temperature fluctuation width can be controlled to a predetermined value.

FIG. 2 shows the thermal fatigue test section. Rotating specimen 1
Are placed inside the autoclave 2. The rotating specimen 1 is provided with a shaft 30 at its center. The shaft 30 is connected to a motor 32 via a joint 31. The autoclave 2 is provided with a seal 34 so that the high-pressure pure water 33 does not leak from the autoclave 2. The shaft 30 is provided with a code 35 for detecting the position in the rotational direction of the rotating test body 1. The rotation direction position detection code 35 is read by the rotation direction position detection device 36, and the rotation direction position of the rotating test body 1 is sent to the control device 37. By using the apparatus shown in FIG. 2, it is possible to stop the rotating specimen 1 at a predetermined position or to control the half rotation of the rotating specimen 1.

FIG. 3 shows a temperature state of the rotating test body 1 in a stopped state. The high-temperature pure water 21 introduced into the autoclave 2 is led out of the autoclave 2 through the high-temperature water chamber 19. The low-temperature pure water 9 introduced into the autoclave 2 is led out of the autoclave 2 through the low-temperature water quality 11. At this time, the high temperature water chamber 19 side of the rotating specimen 1 becomes the rotating specimen high temperature side 40, and the low temperature water chamber 1 of the rotating specimen 1
One side is a low temperature side 41 of the rotating test body.

FIG. 4 shows a temperature state in a stopped state of the rotating test body 1 when the rotating test body 1 is rotated half a circumference from the state of FIG. 3 using the apparatus shown in FIG. Autoclave 2
The high-temperature pure water 21 introduced into the inside is led out of the autoclave 2 through the high-temperature water chamber 19. The low-temperature pure water 9 introduced into the autoclave 2 is led out of the autoclave 2 through the low-temperature water quality 11. At the moment when the rotating specimen 1 has rotated half a revolution, the high temperature water chamber 19 side of the rotating specimen 1 has a low temperature,
The low temperature water chamber side 11 of the rotating test body 1 has a high temperature. But,
Immediately after the rotation of the rotating test body after half rotation, the portion in contact with the high-temperature water chamber 19 on the low-temperature side 50 of the rotating test body becomes the high-temperature portion 51 with the passage of time, and is in contact with the low-temperature water chamber 11 on the high-temperature side 52 of the rotating test body. The part becomes the low temperature part 53. At this time,
By the temperature difference between the low temperature side 50 and the high temperature part 51 of the rotating test body,
In addition, thermal distortion occurs due to the temperature difference between the high temperature side 52 and the low temperature part 53 of the rotating test body. The thermal strain generated at this time is
The cycle of fluctuation and the fluctuation width are different from the thermal strain when the test body is constantly rotating.

In the state shown in FIG.
When the rotating test piece 1 is rotated half a turn again after each of the 3 has fully developed, thermal strain is generated in each part of the rotating test piece 1 in a direction different from that before the half turn. By rotating the rotating specimen 1 by half a revolution, a relatively low frequency and large amplitude thermal strain can be repeatedly given to the rotating specimen 1, and a relatively low frequency and large amplitude thermal fatigue test can be performed. it can.

FIG. 5 shows a program example in which the rotationally synchronized thermal fatigue described in FIG. 1 and the low-period, large-amplitude thermal fatigue described in FIGS. 3 and 4 are combined. Specimen surface temperature 6
0 and the specimen rotation number 61 are shown, and when the specimen rotation number 61 is a constant rotation number 62, the specimen surface temperature 60 becomes a high-frequency thermal fatigue waveform 63. When the specimen is brought into the stop state 64, a low-frequency / large-amplitude thermal fatigue waveform 65 appears. When the test specimen half-turn 66 is added,
A large amplitude thermal fatigue waveform 67 appears. Again, constant speed 6
At 8, a high frequency thermal fatigue waveform 69 appears. By programming as described above, a thermal fatigue test in which high-frequency thermal fatigue and low-frequency thermal fatigue are appropriately combined can be performed.

[0024]

According to the present invention, a thermal fatigue test in which a high-frequency thermal cycle and a low-frequency thermal cycle are appropriately combined can be performed, so that a thermal cycle in which both high-cycle thermal fatigue and low-cycle thermal fatigue are combined can be performed. A fatigue test can be performed.

[Brief description of the drawings]

FIG. 1 is a view showing an entire thermal fatigue test apparatus and a method of a rotational synchronous thermal fatigue test.

FIG. 2 is a diagram showing a thermal fatigue test section.

FIG. 3 is a diagram illustrating a temperature state of the rotating test body when the rotating test body is in a stopped state.

FIG. 4 is a diagram showing a temperature state in a stopped state of the rotating test body when the rotating test body is rotated half a circumference from the state of FIG. 3 using the apparatus shown in FIG. 2;

FIG. 5 is a diagram showing an example of a test program combining a high-frequency thermal cycle and a low-frequency thermal cycle.

[Explanation of symbols]

1 ... rotating specimen, 2 ... autoclave, 3 ... piping, 4 ...
Water 5 ... Filter 6 ... Ion exchange resin 7 ... Reservoir 8 ... Low temperature water piping 9 ... Low temperature pure water 10 ... High pressure metering pump 11 ... Low temperature water chamber 12 ... Cooler 13 Pressure valve, 14 flow meter, 15 high-temperature water pipe, 16 high-pressure metering pump, 17 heat exchanger, 18 preheater, 19 high-temperature water chamber, 20 high-temperature pure water, 21 control device, 30 ... shaft, 31 ... joint, 32 ... motor, 33 ... high pressure water,
34: seal, 35: code for detecting the rotational direction of the test specimen, 36: detecting device for the rotational direction of the test specimen, 40: high temperature side of the rotary test specimen, 41: low temperature side of the rotational test specimen, 50: low temperature side of the rotational test specimen, 51 ... High temperature part, 52 ... High temperature side of rotating test piece, 5
3: low temperature section, 60: specimen surface temperature, 61: specimen rotation number, 62: constant rotation number, 63: high frequency thermal fatigue waveform, 64
... Stopped state, 65 ... Low-frequency, large-amplitude thermal fatigue waveform, 66
... Half-circle rotation of test specimen, 67: anti-low frequency / large amplitude thermal fatigue waveform, 68: constant rotation speed, 69: high frequency thermal fatigue waveform.

Claims (4)

[Claims] 1. A rotating member, a motor, a fluid container surrounding the rotating member, and a rotation direction position detecting device of the rotating member. A high temperature fluid and a low temperature fluid are externally put into predetermined positions in the fluid container, and the rotating member is moved. In a heating or cooling device, a thermal fatigue test device is characterized in that a rotating member is repeatedly rotated and stopped to apply a different temperature waveform to the rotating member. 2. The thermal fatigue test apparatus according to claim 1, wherein a mark for detecting a rotational direction position is provided on the rotating member, and a device capable of reading the mark to detect the rotational direction position of the rotating member is provided. A thermal fatigue test apparatus characterized in that the apparatus can be stopped at a predetermined position. 3. A thermal fatigue test apparatus according to claim 1, wherein a rotary member rotation program capable of giving a predetermined temperature fluctuation is previously stored in a controller of the thermal fatigue test apparatus, and a rotational direction position of the rotary member is set. A thermal fatigue test device that controls the rotation of the rotating member according to the rotating member rotation program while detecting the thermal fatigue test. 4. The thermal fatigue test device according to claim 1, wherein the temperature of the high-temperature fluid and the temperature of the low-temperature fluid introduced into the fluid container can be controlled.