Device for testing samples for thermal fatigue

FIELD: physics.

SUBSTANCE: device has a cylindrical housing, a horizontal partition wall and sensors for monitoring and controlling tests. Inside the cylindrical housing, which has a flat bottom and an air-tight cover which is fixed by bolts and nuts in the top part, there is a drum which is mounted on the cover inside the housing. The horizontal partition wall is placed in the bottom part of the drum and is in form of a perforated disc whose perforations are in form of calibrated orifices lying on a circle, having along their edge calibrated channels for passage of heating medium. Inside the drum there is an additional horizontal partition wall with calibrated orifices which are exactly as those in the perforated disc. Sample pipes are fitted in the perforations of the disc and are fixed on the cover of the housing, and there are vertical partition walls between the pipes. Pipes with a smaller diameter are fitted inside each sample pipe and are fixed in a dispensing receiver and have in their top part connecting pipes for outlet of cooling medium and discharge pipes with calibrated devices on them. In the bottom part of the housing under the perforated disc there is a pipe with a diffusion nozzle connected to a cylindrical diffuser and a connecting pipe for inlet of heating medium and a system of chambers with a connecting pipe at the bottom for outlet of the heating medium.

EFFECT: high quality and accuracy of tests and efficiency thereof.

3 dwg

 

The invention relates to the field of test engineering, in particular to devices for the study of thermosflasche samples, are subject to occasional temperature pulsations in the fluid flow, and can be used in nuclear and thermal power generation and energy transport facilities.

A known device for investigation of thermal fatigue pipes, reproducing in the testing conditions, the destruction of water pipes as a result of changing conditions of heat transfer on the inside of the pipe containing a closed pipe circuit in the form of a triangle, one of the tops facing down and mounted on a shaft filled to a certain level of distillate. On one side of the circuit includes the electric furnace. When the oscillation circuit, the water level in it is moved, thereby the fluctuation of temperature of the pipe wall (Trojan E.A., Karikoski I.K. Thermal fatigue of the pipe at high pressure. The collection: a Study of the safety elements of steam boilers, MEI, M., 1954, p.45-52, and Trojan E.A. Metals boiler and strength of parts of steam boilers. Energy, M.-L., 1964, p.192).

The disadvantages of the known system are the complexity of manufacturing of each sample - closed pipe circuit in the form of a triangle, the installation of the electric furnace to the sample, the difficulty in determining the location for testing, and is also a great period of one cycle, and as a consequence, a lot of time to obtain a large number of cycles (106- 107to build the fatigue curve, in addition, the failure to raise the temperature difference and repetition test conditions due to the individual production of each plot.

Known device for testing a sample for thermostast, containing a hollow cylindrical housing filled with fluid, a partition with a hole provided in the casing and dividing it into two cavities with different temperatures of the coolant, the heater and the cooler coolant, and the heater and the cooler is installed in the housing on opposite sides of the partition, the partition is made in the form of fixed coaxially to the drive enclosure with a recess for accommodating the end of the sample, and the axis of the recess parallel to the axis of the disc and the edge of the recess is located from the axis of the hole at a distance equal to the radius of the holes (SU 1665284, IPC: G01N 3/60, published 23.07.91).

On the totality of symptoms is known technical solution is the closest to the claimed and adopted for the prototype.

A disadvantage of the known technical solutions, as well as a cause of hindering the achievement of the desired technical result when using the known devices is the inability to test one is belt large number of samples and, as a consequence, obtaining reliable statistical data.

Conducted by the applicant's analysis of the prior art, including searching by the patent and scientific and technical information sources, and identify sources that contain information about the equivalents of the claimed invention, has allowed to establish that the applicant is not found technical solutions, characterized by signs that are identical or equivalent to offer. While the proposed solution is not derived explicitly for the specialist by way of the known prior art and defined by the applicant.

The definition from the list of identified unique prototype as the closest technical solution set of the features revealed in the inventive device the essential distinguishing features in relation to perceived by the applicant to the technical result set forth in the following claims.

The proposed solution allows to test simultaneously a large number of samples determined by the dimensions of the body, to carry out fatigue tests to obtain curves of metal fatigue by creating on the surface of the specimen organized leakage of the heat medium unstable temperature regime with sharp fluctuations of temperature at various frequencies and ampli is udah, and also ensures uniform distribution of environments sampled, and, as a consequence, the same temperature for all the samples, which significantly improves the quality and accuracy of the results of tests carried out and their effectiveness.

The proposed device for testing of samples for thermostast, comprising a cylindrical casing, a horizontal division wall and the sensors and control trials, while within the cylindrical body, provided with a flat bottom and sealed in the upper part secured by studs and nuts, is a drum mounted on the lid inside the housing, a horizontal partition located in the lower part of the drum and is made in the form of a perforated disk, a perforation is made in the form of spaced around the circumference of the calibrated holes having along its generatrix calibrated channels for passage of a heating medium into the internal cavity of the drum set additional horizontal partition with calibrated holes in it, exactly the same as the holes in the perforated disc, tube samples are installed in the holes of the perforated disk and secured to the cover, and between the tubes installed vertical partition walls, into the internal cavity of each of the tube-sample wound tube of smaller diameter, enshrined in the handout receiver and having in its upper part fittings for drainage of the cooling medium and the drain tube with calibrated devices on them, in addition, in the lower part of the body under a perforated disk mounted tube with diffuser nozzle connected with a cylindrical diffuser and a nozzle for supplying a heating medium and system cameras with a fitting on the bottom for draining the heating medium.

The invention is illustrated in the drawings, where figure 1 shows a General view of the device, figure 2 - a view a-a of figure 1, the placement of the tube samples in the drum, figure 3 - a view b-B of figure 2, the placement of the tube samples in the perforated disk.

The device includes a cylindrical housing 1 with a flat bottom 2 and sealed by a cover 3, in the upper part secured by studs and nuts 4. Inside the housing 1 is a drum 5 mounted on the cover 3, with the test tube with the sample 6, the number of which is determined by the size of the housing 1. In the lower part of the drum 5 posted by a horizontal partition, made in the form of a perforated disk 7. Perforation is made in the form of spaced around the circumference of the calibrated holes having along its generatrix calibrated channels 8 for the passage of a heating medium. In the inner cavity of the drum 5 are additional horizontal partition 9 with alibrandi holes in it, exactly the same as in the perforated disk 7. Tube samples 6 are installed in the holes of the perforated disk 7 and is secured to the cover 3 of the housing 1, and to eliminate the mutual influence of the flow of heating medium between the tubes 6 are installed vertical dividers 10. Inside each tube sample 6 wound tube of smaller diameter inlet cooling medium 11 mounted in the handout receiver 12 to provide uniform distribution of the cooling medium and having in its upper part, the socket 13 for draining the cooling medium and the drain tube 14 with calibrated devices 15 on them. In the lower part of the housing 1 under the perforated disk 7 has a tube 16 with a diffuser nozzle at its end connected with a cylindrical diffuser 17 and the connection of the inlet of the heat medium 18. For removal of the heating medium is installed cameras 19 and 20 and the fitting 21 on the bottom 2. In the internal volume of the drum 5 has a pressure sensor, and on the outer surface of tube samples 6 - thermocouples and strain gages (not shown). For organized leakage of the heat medium in the center of the cover 3 has a fitting 22. For collecting the cooling medium has an annular duct 23. For uniform distribution of the pumped heating medium through the tubes of the sample 6 is provided a cylindrical displacer 24 in the center of the drum 5. As the heating and cooling medium can be used in any working environment - liquids or gases.

The device operates as follows. The heating medium is supplied through the inlet fitting of the heat medium 18, spreads through the diffuser 17 and is discharged through a system of chambers 19, 20 and the nozzle outlet 21. The value of organized leakage of the heating medium is regulated through the nozzle 22. A supply of cooling medium into the internal cavity of the tube 6 samples from receiver 12. In the zone of separation of hot and cold environments along the outer surface of tube samples 6 and the perforation of the disc 7 having ripple temperature and the corresponding thermal stresses, resulting in damage to the specimens, the cracks in them). Control of frequency and amplitude of thermopylai by varying the temperature and flow of heating and cooling media, the direction of the movement of the cooling medium, the magnitude and direction of an organized leakage of the heat medium through the nozzle 22. Temperature fluctuations in the environment acting on the surface of the tubes sample and causing the deformation of their surface, are recorded by sensors and control tests (pressure sensors, strain gauges and thermocouples). Based on these measurements, calculate the voltage corresponding to the deformations of the tube samples, and in accordance with the number of test cycles to build the curves of the mouth of the spine.

Device for testing of samples for thermostast, comprising a cylindrical casing, a horizontal division wall and the sensors and control trials, characterized in that within the cylindrical body, provided with a flat bottom and sealed at the top, secured by studs and nuts, is a drum mounted on the lid inside the housing, a horizontal partition located in the lower part of the drum and is made in the form of a perforated disk, a perforation is made in the form of spaced around the circumference of the calibrated holes having along its generatrix calibrated channels for passage of a heating medium into the internal cavity of the drum set additional horizontal partition with calibrated holes in it, exactly the same as the holes in the perforated disc, tube samples are installed in the holes of the perforated disk and secured to the cover, and between the tubes installed vertical partition walls, into the internal cavity of each tube sample wound tube of smaller diameter, fixed in the handout receiver and having in its upper part fittings for drainage of the cooling medium and the drain tube with calibrated devices on them, in addition, signicast building under a perforated disk mounted tube with diffuser nozzle, connected with a cylindrical diffuser and a nozzle for supplying a heating medium and system cameras with a fitting on the bottom for draining the heating medium.



 

Same patents:

FIELD: physics.

SUBSTANCE: method of determining heat resistance of bentonite clay is characterised by that, a nomograph which reflects dependency of temperature of the second endothermal effect and heat resistance of bentonite clay from contained structural iron is constructed first. For this purpose samples of bentonite clay from known deposits are analysed. The samples are tested in a derivatograph. Derivatograms with differential thermo-weighted (DTW) and differential thermal (DT) curves are obtained, from which temperature of the second endothermal effect is determined depending on structural iron contained in the samples. Heat resistance of the samples is determined depending on structural iron contained in the samples. From the said two curves, the said nomogram is constructed, which is then used for subsequent determination of heat resistance of the analysed bentonite clay; a wet ground up sample is tested in a derivatograph by heating followed by drying. Derivatograms with differential thermo-weighted and differential thermal curves are obtained, from which temperature of the second endothermal effect is determined and heat resistance of the analysed bentonite clay is determined from the said nomogram.

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