High temperature strain control test local environment control device

Abstract

The application provides a high-temperature strain control test local environment control device, which comprises a split shell composed of a front shell and a rear shell, a hollow structure is formed in the split shell, and a grating ruler for measuring deformation of a high-temperature creep test piece is arranged in the hollow structure; wherein the front shell and the rear shell are both convex structures, a smaller cavity is formed in the upper part of the convex structure, a larger cavity is formed in the lower part of the convex structure, the grating ruler is arranged in the larger cavity, the smaller cavity is arranged between the larger cavity and the high-temperature creep test piece, a dustproof and heat insulation plate is arranged between the smaller cavity and the larger cavity; a top opening is arranged at the top of the split shell, a top cover is arranged on the top opening; an observation window is arranged on the side wall of the front shell matched with the grating ruler; a fan is arranged on the side wall of the front shell matched with the smaller cavity, an air inlet is arranged on the side wall of the rear shell matched with the smaller cavity, and the smaller cavities of the front shell and the rear shell form a cooling channel.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aero-engine test, and particularly relates to a high-temperature strain control test local environment control device. BACKGROUND

[0002] Stress relaxation test is an important material performance testing method in the development process of aero-engine. The stress relaxation test is generally carried out on a high-temperature creep test machine. The test machine and the matching test environment are generally designed to adapt to the load control of the endurance creep test. Some factors that have little effect on the endurance creep test process and test accuracy have a huge impact on the stress relaxation test using strain control.

[0003] The stress relaxation test carried out by the conventional high-temperature creep test room has low success rate and poor data accuracy, which greatly increases the difficulty of obtaining good stress relaxation test data. Among them, the fluctuation factors of the local environment of the strain measurement system of the tester are one of the main reasons for such problems.

[0004] The common stress relaxation test equipment does not have local environment control capability, so the test room generally has the following problems, such as:

[0005] 1) The personnel movement in the high-temperature creep test environment causes air flow disturbance, changes in ventilation conditions and outdoor air flow conditions, thereby forming air flow impact on the test measurement, causing local temperature mutation of the key measurement part and inaccurate measurement;

[0006] 2) The thermal effect of the ultra-high temperature test affects the measurement accuracy and service life of the grating ruler used for measurement;

[0007] 3) The personnel or objects in the test environment may accidentally contact the strain measurement and control device or the loading system, thereby causing measurement failure;

[0008] 4) There are large dust particles falling and adhering to the grating ruler and the top rod contact surface of the strain measurement and control device in the high-temperature furnace for high-temperature creep, which affects the normal contact of the grating ruler contact, and small particle dust also poses a hazard to the human body.

[0009] In addition, due to the poor environment control of the high-temperature creep test room, the following problems may also occur:

[0010] 1) Test room environment temperature fluctuation: the high-temperature stress relaxation test place has many equipment and dense arrangement, and the test machine environment temperature is greatly affected by the day and night temperature difference and the operation of other test equipment in the same space.

[0011] 2) High-temperature scalding risk: the temperature of the strain measurement and control device or the loading system outside the furnace is relatively high, and scalding may occur if personnel accidentally contact it. SUMMARY

[0012] The purpose of the present application is to provide a high-temperature strain control test local environment control device to solve or alleviate at least one problem in the background art.

[0013] The technical solution of the present application is: a high-temperature strain control test local environment control device, comprising:

[0014] The split shell composed of the front shell and the rear shell has a hollow structure formed inside, and the grating ruler for measuring the deformation amount of the high-temperature creep test piece is placed in the hollow structure;

[0015] Among them, the front shell and the rear shell are both convex letter-shaped structures, the upper part of the convex letter-shaped structure forms a smaller cavity, the lower part of the convex letter-shaped structure forms a larger cavity, the grating ruler is placed in the larger cavity, the smaller cavity is between the larger cavity and the high-temperature creep test piece, a dustproof and heat insulation plate is arranged between the smaller cavity and the larger cavity, and the dustproof and heat insulation plate divides the smaller cavity and the larger cavity into two independent cavities;

[0016] An opening is arranged at the top of the split shell, and a top cover is mounted on the opening, which is changed according to the configuration of the clamp used to support the high-temperature creep test piece;

[0017] An observation window is arranged on the side wall of the front shell adapted to the grating ruler, so that the test personnel can observe the inside of the hollow structure through the observation window;

[0018] A fan is mounted on the side wall of the front shell adapted to the smaller cavity, and an air inlet hole is arranged on the side wall of the rear shell adapted to the smaller cavity, the smaller cavities of the front shell and the rear shell form a cooling channel, and the airflow is controlled to enter the cooling channel from the air inlet hole through the fan to reduce the problem of the clamp used to support the high-temperature creep test piece.

[0019] In the preferred embodiment of the present application, the front shell and the rear shell constitute a split shell through at least one hinge.

[0020] In the preferred embodiment of the present application, the front shell and the rear shell are both double-walled structures, and the double walls are filled with a low thermal conductivity material.

[0021] In the preferred embodiment of the present application, the front shell and the rear shell are made of high-temperature resistant materials.

[0022] In the preferred embodiment of the present application, the top cover is made of a low thermal conductivity material.

[0023] In the preferred embodiment of the present application, a filter layer is arranged inside the fan located in the smaller cavity to prevent particles in the cooling channel from flying out.

[0024] In the preferred embodiment of the present application, a video monitoring probe is mounted on the side wall of the front or rear shell body adapted to the grating ruler, through which the operator can observe the inside of the split shell body.

[0025] The local environment control device provided by the present application can physically isolate the furnace outside part of the strain measurement and control device or loading system from the external environment. On the one hand, it can eliminate the influence of test environment fluctuations on the test results, including environmental temperature fluctuations (there are many high-temperature stress relaxation test site equipment, and the test machine environmental temperature is greatly affected by the day and night temperature difference and the operation of other test equipment in the same space) and environmental airflow impact (changes in ventilation conditions and outdoor airflow conditions form airflow impact on the test measurement control device, causing local temperature mutation at the key position), avoiding external abnormal touch affecting the test results. At the same time, since the furnace outside part of the strain measurement and control device or loading system is affected by high temperature, the device can reduce the temperature or area of the accessible part to prevent accidental contact and scalding, reducing the risk of damage. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions provided by the present application, the following will briefly introduce the drawings. Obviously, the drawings described below are only some embodiments of the present application.

[0027] Figure 1 The local environment control device structure of the present application.

[0028] Figure 2 The local environment control device of the present application is a cross-sectional view.

[0029] Figure 3 The local environment control device of the present application is a test process schematic diagram. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below in conjunction with the drawings in the embodiments of the present application.

[0031] In order to solve the problem that the current common stress relaxation test equipment lacks local environment control means, the present application provides a high-temperature stress relaxation test local environment control device, which is installed on the common stress relaxation test equipment.

[0032] As shown in Figure 1 The high-temperature stress relaxation test local environment control device 10 provided by the present application mainly includes: a front shell body 11, a rear shell body 12, a top cover 13, an observation window 14, a fan 15 and a dustproof heat insulation plate 18.

[0033] The front shell 11 and the rear shell 12 form a split shell, and the front shell 11 and the rear shell 12 are connected by at least one hinge 19 to form an openable structure. The front shell 11 and the rear shell 12 are thin-walled sandwich structures, and the middle parts of the two are hollow structures. The front shell 11 and the rear shell 12 are symmetrical in the butt joint surface, and the front shell 11 and the rear shell 12 are both convex structures, the upper part is a smaller cavity, and the lower part is a larger cavity.

[0034] The front shell 11 and the rear shell 12 are double-walled structures, and the wall plates are made of high-temperature-resistant materials, such as tungsten, molybdenum, titanium, and other refractory metals or rare earth metals, or non-metallic compounds such as boron carbide and silicon carbide. Low thermal conductivity materials are filled between the double walls to improve the heat insulation capacity of the shell, such as polyurethane or rock wool board.

[0035] An opening is provided at the top of the split shell, and a top cover 13 is installed on the opening. The top cover 13 is changed according to the corresponding structure of the clamp used in the specific test. The top cover 13 is made of low thermal conductivity material for heat insulation and cooling, such as polyurethane or rock wool board in the above embodiment. In this application, the top cover 13 is a half-split structure, and a through groove is provided in the middle of the half-split structure.

[0036] An observation window 14 is provided on the side wall corresponding to the position of the larger cavity of the front shell 11.

[0037] A fan 15 is installed on the side wall corresponding to the position of the smaller cavity. Preferably, a filter layer 16 is installed on the inner side of the fan 15. An air inlet hole 121 is provided on the side wall corresponding to the position of the smaller cavity of the rear shell 12. The positions of the smaller cavities of the front shell 11 and the rear shell 12 can form an air duct for gas circulation, and the fan 5 can form a gas circulation environment from the air inlet hole 121 to the outlet of the fan 5. The positions of the larger cavities of the front shell 11 and the rear shell 12 form a protection space for the strain measurement and control device. By setting a filter layer 16 at the outlet of the air duct, dust can be isolated and filtered to prevent dust in the cavity from entering the indoor environment and harming the health of test personnel.

[0038] A dustproof and heat insulation plate 18 is provided between the smaller cavity and the larger cavity inside the split shell, and the dustproof and heat insulation plate 18 divides the smaller cavity and the larger cavity into two independent cavities. In this application, the dustproof and heat insulation plate 18 is a half-split structure, and each is fixedly connected to the front shell 11 or the rear shell 12.

[0039] Further, in order to overcome the problem that the split shell shields the protected part and is not conducive to observing the inside of the shell, in addition to the observation window 14 arranged on the wall surface of the front shell 1, a video monitoring probe 7 is arranged on the rear shell 2, so that the operator can observe the inside of the split shell through the video monitoring probe 7, and remote monitoring can be performed through the network.

[0040] As shown in Figure 3 The local environment control device 10 is placed on the test operation platform 21, the heating furnace 22 is arranged above the local environment control device 10, the high-temperature creep test piece (not shown) is placed in the heating furnace 22, and the heating of the high-temperature creep test piece is realized through the heating furnace 22. The high-temperature creep test piece is supported on the test operation platform 21 through the top rod 23 and the adjusting column 24. Two grating scales 25 are connected to the high-temperature creep test piece and are laid along the top rod 23 from the inside of the heating furnace 22, and the deformation amount of the high-temperature creep test piece in the heating furnace 22 can be measured through the grating scale 25.

[0041] The grating scale 25 is a strain measurement sensor of the creep test piece, which is arranged in the larger cavity (i.e. the lower cavity) of the local environment control device 10, and the top rod 23 and the grating scale 25 extend into the larger cavity through the top cover 13 and the dustproof and heat insulation plate 18. The smaller cavity is between the larger cavity and the heating furnace 22, and the influence of the heat radiation generated by the heating furnace 23 on the measurement accuracy of the grating scale 25 below can be reduced by using a shell and a top cover 13 made of low thermal conductivity material. At the same time, the airflow channel formed by the smaller cavity (i.e. the upper cavity) between the grating scale 25 and the heating furnace 22, when the temperature sensor arranged on the fan 15 senses that the temperature inside the upper cavity or the lower cavity exceeds the predetermined value, the fan 15 is started, and the environmental air is introduced from the air inlet hole 121 and the high-temperature air is discharged from the fan 15, which slows down the influence of convective heat transfer on the environment temperature of the lower cavity, further reduces the influence of the furnace temperature, and the airflow can also cool the top rod 23, reduce the degree of heat transfer downward, and reduce the environment temperature of the measurement and control area of the grating scale 25. At the same time, the filter layer 16 inside the fan 15 can realize dust removal and harm reduction, and reduce the influence of dust on the grating scale 25.

[0042] Through the top cover 13 arranged on the top of the split shell, the particles falling in the environment can be blocked, and the larger particles are prevented from moving downward and adhering to the contact surface of the grating scale 25 and the top rod 23 of the strain measurement and control device, so as to affect the normal contact of the grating scale 25 contact or cause inaccurate strain measurement or damage to the grating scale 25.

[0043] In use, the observation window 14 of the front shell 11 faces the test operator, the rear shell 12 is fixed on the test operation platform 21, and after the test starts, the front shell 11 is rotated along the hinge 19 to complete the closure with the rear shell 12.

[0044] The local environment control device provided by the application can physically isolate the furnace outer part of the strain measurement and control device or the loading system from the external environment. On the one hand, it can eliminate the influence of test environment fluctuations on the test piece measurement results, including environmental temperature fluctuations (there are many high-temperature stress relaxation test site equipment, and the test machine environmental temperature is greatly affected by the day and night temperature difference and the operation of other test equipment in the same space) and environmental airflow impact (changes in ventilation conditions and outdoor airflow conditions form airflow impact on the test measurement control device, causing local temperature mutation at key positions), avoiding external abnormal touch from affecting the test results. At the same time, since the furnace outer part of the strain measurement and control device or the loading system is affected by the high temperature of the furnace, the device can reduce the temperature or area of the accessible part to prevent accidental contact and scalding, reducing the risk of damage.

[0045] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto. Any changes or replacements within the technical scope disclosed by the application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A local environment control device for high-temperature strain control testing, characterized in that, include: The shell consists of a front shell and a rear shell, and the interior of the shell has a hollow structure. The grating ruler for measuring the deformation of the high-temperature creep test piece is placed in the hollow structure. The front and rear housings are both convex-shaped structures. The upper part of the convex-shaped structure forms a smaller cavity, and the lower part of the convex-shaped structure forms a larger cavity. The grating ruler is placed in the larger cavity. The smaller cavity is located between the larger cavity and the high-temperature creep test piece. A dustproof and heat-insulating plate is provided between the smaller cavity and the larger cavity, which divides the smaller cavity and the larger cavity into two independent cavities. An opening is provided at the top of the split shell, and a top cover is installed on the opening. The top cover is modified according to the configuration of the fixture used to support the high-temperature creep test specimen. An observation window is provided on the side wall of the front housing that is adapted to the grating ruler, so that the test personnel can observe the interior of the hollow structure through the observation window; A fan is installed on the side wall of the front housing that is adapted to the smaller cavity, and an air inlet is provided on the side wall of the rear housing that is adapted to the smaller cavity. The smaller cavities of the front and rear housings form a cooling channel. The airflow is controlled by the fan to enter the cooling channel through the air inlet, thereby reducing the temperature of the fixture used to support the high-temperature creep test specimen. The local environment control device is placed on the test operation platform, and the heating furnace is set above the local environment control device. The high-temperature creep test piece is placed in the heating furnace, and the heating furnace is used to heat the high-temperature creep test piece. The high-temperature creep test piece is supported on the test operation platform by a top rod and an adjusting column. Two grating rulers are connected to the high-temperature creep test piece and are laid along the top rod inside the heating furnace. The deformation of the high-temperature creep test piece inside the heating furnace is measured by the grating rulers.

2. The high-temperature strain control test local environment control device as described in claim 1, characterized in that, The front and rear housings are configured as a split housing via at least one hinge.

3. The high-temperature strain control test local environment control device as described in claim 1 or 2, characterized in that, Both the front and rear shells are double-walled structures, with a low thermal conductivity material filling the space between the double walls.

4. The high-temperature strain control test local environment control device as described in claim 3, characterized in that, The front and rear housings are made of high-temperature resistant materials.

5. The high-temperature strain control test local environment control device as described in claim 1, characterized in that, The top cover is made of a material with low thermal conductivity.

6. The high-temperature strain control test local environment control device as described in claim 1, characterized in that, A filter layer is installed inside the fan, located in a smaller cavity, to prevent harmful dust from flying out of the cooling channel.

7. The high-temperature strain control test local environment control device as described in claim 1, characterized in that, A video monitoring probe is installed on the side wall of the front or rear housing that is adapted to the grating ruler, so that the operator can easily observe the situation inside the split housing through the video monitoring probe.

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