CN219015955U - A device that can increase the service life of a high-temperature sandblasting erosion tester - Google Patents

Abstract

The utility model belongs to the field of service behavior evaluation of materials, in particular to a device that can improve the service life of a high-temperature sandblasting erosion test machine, and is suitable for the service behavior evaluation of test sample coatings under high-temperature sandblasting erosion conditions. In the lower insulation chamber of the high-temperature sandblasting erosion testing machine, the sample is set on the sample heating and erosion angle adjustment device; in the upper insulation chamber of the high-temperature sandblasting erosion testing machine, the outlet at the lower end of the nozzle corresponds to the sample. The nozzle performs high-temperature sandblasting on the sample, and the sample heater and the erosion angle regulator on the sample heating and erosion angle adjustment device are respectively connected to an external power supply through a line. Determine the conditions required for the test according to the actual working conditions and adjust the sample angle and temperature, and preheat the samples to the actual working condition temperature through the sample heater to conduct the simulation test. The utility model is suitable for high-temperature sandblasting and erosion testing machines, which can greatly increase the heating rate of samples and prolong the service life of the heating system of the original testing machine.

Description

A device that can increase the service life of a high-temperature sandblasting erosion tester

technical field

The utility model belongs to the field of service behavior evaluation of materials, in particular to a device that can improve the service life of a high-temperature sandblasting erosion test machine, and is suitable for the service behavior evaluation of test sample coatings under high-temperature sandblasting erosion working conditions.

Background technique

The high-temperature sandblasting erosion tester is a new type of erosion resistance evaluation equipment that can be used in the fields of aero-engines and steam turbines. The high-speed moving sand particles are ejected from the nozzle to cause erosion of the object to be measured, and the properties of the object to be measured are studied through the analysis of the erosion area. During the erosion test, the high-speed sand is sprayed on the surface of the impact sample, and the pressure is very high. Therefore, the sample fixture needs to clamp the sample while maintaining its own stability.

Chinese Invention Patent Publication No. CN102175547A proposes a mold material erosion testing machine, which includes a heating and holding furnace and a motor. The heating and holding furnace includes a cylindrical furnace body. The top of the furnace body is provided with a furnace cover. There is a shaft hole in the middle of the furnace cover, an outflow port on the bottom side of the furnace body, a control valve in the outflow port, and a heating and heat preservation coil on the outer bottom of the furnace body; the output end of the motor is connected to the transmission shaft , the other end of the transmission shaft extends into the furnace body through the shaft hole in the middle of the furnace cover, and connects the two sample holders through a horizontal connecting rod.

The existing sample heating method is to slowly heat up the entire test chamber by preheating the air, and use the stable temperature gradient between the heating body and the sample in the air heater to control the temperature. This design has too high requirements on the service performance of the heating body in the front-end air heater, and the temperature difference between the heating body and the sample reaches about 300°C in the high temperature section, that is to say, the service temperature of the heating body in the front-end air heater has been at Due to the ultra-high temperature (1000°C) state, its service life is very short, and the maintenance cycle of high-temperature erosion equipment is very long, which seriously affects the smooth progress of research work.

Utility model content

The purpose of this utility model is to provide a device that can improve the service life of the high-temperature sandblasting erosion tester, so as to solve the problem that the current high-temperature erosion research simply uses an air heater to heat the sample, resulting in a short service period of the high-temperature sandblasting erosion tester , slow temperature rise, unstable temperature control and other problems.

In order to achieve the above object, the technical solution of the utility model is:

A device that can improve the service life of a high-temperature sandblasting erosion testing machine. In the lower insulation chamber of the high-temperature sandblasting erosion testing machine, samples are placed on the sample heating and erosion angle adjustment device; In the upper insulation chamber of the machine, the outlet at the lower end of the nozzle corresponds to the sample. The sample is subjected to high-temperature sandblasting and erosion through the nozzle. The sample heater and the erosion angle regulator on the sample heating and erosion angle adjustment device are respectively connected to the external power supply.

In the device that can improve the service life of the high-temperature sandblasting erosion testing machine, the sample heating and erosion angle adjustment device is an integrated structure of the erosion angle adjuster and the heater fixing device, and the erosion angle adjuster is a quarter The fan-shaped structure of the disk has erosion angle positioning holes evenly along the circumferential direction; the heater fixing device is arranged on one side of the erosion angle regulator, and its two sides are connected to the rotating shaft through the installation holes, and the erosion angle can be adjusted by rotating the erosion angle. The regulator adjusts the sample angle on the heater fixing device, and the positioning holes correspond to different erosion angles to adjust the rotation angle and position through the card slot.

In the device that can improve the service life of the high-temperature sandblasting erosion testing machine, a sample table and a sample heater are arranged in the top groove of the heater fixing device, the sample table is set on the sample heater, and the sample is set on the sample table , A heater outlet corresponding to the side of the sample heater is provided on the heater fixing device.

The device that can improve the service life of the high-temperature sandblasting erosion testing machine, the sample heater is equipped with a high-temperature alloy shell, a ceramic protective sleeve, a platinum-rhodium electric heating wire, a ceramic protective sleeve is laid in the high-temperature alloy shell, and the platinum-rhodium electric heating The wires are passed through the ceramic protective sleeve in turn and both ends are led out from the outlets of the two casings. The top of the superalloy casing is installed with a high-temperature alloy cover. The upper edge of the high-temperature alloy cover is equipped with a square-shaped boss as a sample platform. The test sample is fixed by the sample stage.

The device that can improve the service life of the high-temperature sandblasting erosion testing machine is that when making the sample heater, the platinum-rhodium electric heating wire is wound, and the upper, middle and lower layers of the high-temperature alloy shell are covered with ceramic protective sleeves 10 ceramic protection sleeves are distributed in parallel in each layer, and the platinum-rhodium heating wire passes through the ceramic protection sleeves from left to right and from top to bottom; after the wire winding is completed, ceramic The protective sleeve protects the platinum-rhodium heating wire drawn out.

The design idea of the present utility model is:

The utility model proposes a device that can improve the service life of a high-temperature sandblasting erosion testing machine. Its core is to design a device that can quickly preheat samples. After the device is introduced into a high-temperature erosion testing machine, the The temperature difference between the heating body and the sample in the air heater (about 20°C), the reserved temperature gradient can be maintained to compensate for the heat taken away during the sand entry process.

Platinum rhodium wire has the advantages of the highest accuracy, the best stability, wide temperature measurement range, long service life, and high temperature measurement upper limit in the thermocouple series. It is suitable for oxidizing and inert atmospheres, and can also be used in vacuum for a short period of time, but it is not suitable for reducing atmospheres or atmospheres containing metal or non-metal vapors. Industrial thermocouples include platinum rhodium wire B type, S type, and R type. Platinum rhodium thermocouples are also called high-temperature noble metal thermocouples. Platinum rhodium has single platinum rhodium (platinum rhodium 10-platinum rhodium) and double platinum rhodium (platinum rhodium Rhodium 30-platinum rhodium 6), as temperature measurement sensors, they are usually used together with temperature transmitters, regulators and display instruments to form a process control system to directly measure or control various production processes from 0 to Fluid, steam and gas medium and solid surface temperature in the range of 1800°C. The industries used include: iron and steel, power generation, petroleum, chemical industry, glass fiber, food, glass, pharmaceuticals, ceramics, nonferrous metals, heat treatment, aerospace, powder metallurgy, carbon, coking, printing and dyeing, and almost all industrial fields.

According to the working principle of the platinum-rhodium wire heater, it is mainly composed of two parts: resistance wire and heat insulation material. The resistance wire is used to convert electric energy into heat energy, and the heat insulation material plays the role of heat preservation. Make the sample heater reach the required temperature and have a suitable temperature distribution. In addition, the interior of the sample heater also includes ceramic tubes, magnesium oxide, terminal posts, etc. The ceramic tube is used to place the resistance wire, the insulating material is contained in the sample heater shell, and the terminal post is connected with the power supply and the resistance wire. Platinum rhodium wire heater is a device that converts electrical energy into heat energy.

However, in such a narrow space of the high-temperature sandblasting erosion performance testing machine, in order to simulate the high-temperature erosion conditions of aero-engine particles, it is necessary to manufacture a small, convenient, fast heating, and high-power heater, which is heated by conventional air. The temperature control of the device is unstable, the maximum temperature cannot reach the test temperature, and the actual operation is difficult and many other problems.

Therefore, the utility model develops a heater capable of heating the test sample, which is installed in a high-temperature sandblasting erosion tester, and a cost-acceptable platinum-rhodium wire heater manufacturing method. After the sample heater is made, its The introduction of the original high-temperature sandblasting erosion testing machine can easily preheat the test samples to the required temperature, greatly reduce the service temperature of the heating body in the front air heater, and greatly improve the service life of the high-temperature erosion testing machine.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

1. The utility model can heat the sample to a high-temperature section without a slow preheating link, and is especially suitable for research on high-temperature erosion behavior with a fast temperature rise rate.

2. Compared with the original heating means, the temperature of the heating body in the front-end air heater of the utility model is greatly reduced, thereby improving its service life, prolonging the maintenance cycle, saving maintenance costs and improving work efficiency.

3. The high-temperature sample heater produced by the utility model has the characteristics of reliable and simple operation, easy disassembly and installation, fast temperature rise rate, and adjustable angle.

4. The high-temperature sample heater produced by the utility model can simulate the high-temperature environment of an aero-engine, and thanks to its convenient manufacture, fast temperature rise rate, and high heating temperature, it can be used to study the high-temperature erosion of an aero-engine under medium working conditions Behavior.

Description of drawings

Figure 1 is a schematic diagram of the structure of a high-temperature sandblasting erosion tester.

Fig. 2 is a schematic structural diagram of the sample heating and erosion angle adjustment device.

Fig. 3 is a schematic diagram of the structure of the sample heater.

In the figure, 1 air compressor, 2 pressure gauge, 3 oil-water separator, 4 flow meter, 5 vibrating feeder, 6 particle funnel, 7 air heater, 8 sand leakage pipe, 9 nozzle, 10 upper insulation chamber, 11 Sample, 12 lower heat preservation chamber, 13 sample heating and erosion angle adjustment device, 14 double-disc velocimeter, 15 pneumatic guide rail, 16 external power supply, 17 heater fixing device, 18 heater outlet, 19 erosion angle adjuster , 20 mounting holes, 21 erosion angle positioning holes, 22 sample stages, 23 sample heaters, 24 superalloy shells, 25 shell outlets, 26 platinum-rhodium heating wires, 27 superalloy cover plates.

Detailed ways

Below, the utility model is described in further detail in conjunction with accompanying drawing.

As shown in Figure 1, the existing high-temperature sandblasting erosion test machine mainly includes an air compressor 1, a pressure gauge 2, an oil-water separator 3, a flow meter 4, a vibrating feeder 5, a particle funnel 6, and an air heater 7 , sand leakage pipe 8, nozzle 9, upper heat preservation chamber 10, sample 11, lower heat preservation chamber 12, sample heating and erosion angle adjustment device 13, double-disc velocimeter 14, pneumatic guide rail 15, external power supply 16, the specific structure is as follows :

The horizontal pneumatic guide rail 15 is provided with a double-disc velocimeter 14 and a lower heat preservation chamber 12, and the upper heat preservation chamber 10 and the lower heat preservation chamber 12 are set up and down oppositely; the gas outlet of the air compressor 1 is connected to the nozzle 9 in the upper heat preservation chamber 10 through a pipeline. , a pressure gauge 2, an oil-water separator 3, a flow meter 4, and an air heater 7 are arranged on the pipeline; a particle funnel 6 is arranged above the upper insulation chamber 10, and the bottom of the particle funnel 6 communicates with the nozzle 9 through a sand leakage pipe 8, The vibrating feeder 5 is installed on the side of the particle funnel 6, and the particles for sandblasting are housed in the particle funnel 6. The particle outlet of the tube 8 and the gas outlet of the air heater 7 are collected at the upper inlet of the nozzle 9, and the sample 11 in the lower heat preservation chamber 12 is set on the sample heating and erosion angle adjustment device 13, and the outlet at the lower end of the nozzle 9 corresponds to the sample 11 The sample is subjected to high-temperature sandblasting and erosion through the nozzle 9, and the sample heater 23 and the erosion angle regulator 19 on the sample heating and erosion angle adjustment device 13 are respectively connected to the external power supply 16 through lines.

As shown in Figures 2-3, the sample heating and erosion angle adjustment device 13 is an integrated structure of the erosion angle adjuster 19 and the heater fixing device 17. It is made of stainless steel, and the erosion angle adjuster 19 is a quarter. One disc fan-shaped structure, which evenly sets the erosion angle positioning hole 21 along the circumferential direction; the heater fixing device 17 is arranged on one side of the erosion angle regulator 19, and its two sides are connected to the rotating shaft through the installation hole 20 , by rotating the erosion angle regulator 19 to adjust the sample angle on the heater fixture 17, the positioning hole 21 corresponding to different erosion angles is adjusted and positioned through the slot, and the top groove of the heater fixture 17 is provided with There are a sample stage 22 and a sample heater 23, the sample stage 22 is arranged on the sample heater 23, the sample is arranged on the sample stage 22, and a heater outlet 18 corresponding to one side of the sample heater 23 is provided on the heater fixing device 17 .

As shown in Figures 2-3, the sample heater 23 is provided with a high-temperature alloy shell 24, a ceramic protective sleeve, and a platinum-rhodium heating wire 26, and a ceramic protective sleeve is laid in the high-temperature alloy shell 24, and the platinum-rhodium heating wire 26 is worn in turn. It is set on the ceramic protective sleeve and its two ends are drawn from the two shell outlets 25. The top of the superalloy shell 24 is equipped with a high-temperature alloy cover plate 27, and the upper edge of the high-temperature alloy cover plate 27 is provided with a square-shaped boss as a sample platform. 22. The test sample is fixed by the sample stage 22. The sample heater 23 can serve as a sample stage and can also heat the sample at high temperature. The sample heater is small in size and high in heating temperature. The manufactured sample heater can preheat the sample to simulate aviation For the actual working temperature required in aerospace and other fields, the temperature of the sample heater 23 can be adjusted through the external power supply 16, up to 700°C.

When making the sample heater 23, the platinum-rhodium heating wire 26 is wound, and the upper, middle and lower layers of the superalloy shell 24 are covered with ceramic protection sleeves, and 10 ceramic protection sleeves are distributed in parallel on each layer. , the platinum-rhodium heating wire 26 passes through the ceramic protection sleeve from left to right and from top to bottom. After the wire winding is completed, a ceramic protective sleeve is added to the outlet end 25 of the shell of the sample heater 23 to protect the drawn platinum-rhodium heating wire 26 .

After the above preparatory work is completed, the power of the sample heater 23 is adjusted through the external power supply 16, and the power of the sample heater 23 is gradually increased by gradually increasing the current, and finally the peak value is measured, and each temperature of the sample heater 23 is measured The corresponding resistance below. After the calibration of the sample heater 23 is completed, it is placed in the sample heating and erosion angle adjustment device 13, and the surroundings of the sample heater 23 are fixed with magnesia bricks, thereby playing the role of heat insulation, heat preservation, fixation and insulation.

As shown in Figures 2-3, the sample heater 23, sample heating and erosion angle adjustment device 13 are put together into the high-temperature sandblasting erosion testing machine, and the angle is adjusted through the erosion angle positioning hole 21. There is a requirement for the distance from the nozzle of the testing machine to the center of the sample, so the sample heater cannot be too thick, and the ceramic protective sleeve at the outlet end 25 of the shell should be very thin and resistant to erosion. Due to the sand erosion for a long time in the test, it is extremely important to test the shell of the sample heater, and in addition to being in a high temperature working state for a long time, so a superalloy material is selected as the shell of the sample heater 23 . After the sample heater 23 and the sample heating and erosion angle adjustment device 13 are fixed, they are put into the high-temperature sandblasting erosion testing machine together, and the sample angle and temperature are adjusted according to the actual working conditions to determine the required conditions for the test to conduct a simulation test.

The implementation results show that the sample heater of the utility model can be adjusted and fixed according to the size of the sample, so as to meet the requirements of the working conditions on the erosion angle and height. The outlet end of the sample heater is protected by a ceramic tube to prevent erosion from damaging the heating wire. Therefore, it is suitable for high-temperature sandblasting erosion testing machines, which can greatly increase the heating rate of samples and prolong the service life of the heating system of the original testing machine.

Claims (4)

1. The device capable of prolonging service life of the high Wen Pensha erosion testing machine is characterized in that a sample is arranged on a sample heating and erosion angle adjusting device in a lower heat preservation cavity of the high Wen Pensha erosion testing machine; in the upper heat-preserving cavity of the high Wen Pensha erosion testing machine, the outlet at the lower end of the nozzle corresponds to the sample, the sample is subjected to high Wen Pensha erosion through the nozzle, and a sample heater and an erosion angle regulator on the sample heating and erosion angle regulating device are respectively connected with an external power supply through lines.

2. The device for prolonging service life of high Wen Pensha erosion testing machine according to claim 1, wherein the sample heating and erosion angle adjusting device is an integrated combination structure of an erosion angle adjuster and a heater fixing device, the erosion angle adjuster is a sector structure of a quarter disc, and erosion angle positioning holes are uniformly formed along the circumferential direction; the heater fixing device is arranged on one side face of the erosion angle adjuster, two sides of the heater fixing device are connected with the rotating shaft through mounting holes, the sample angle on the heater fixing device is adjusted through rotating the erosion angle adjuster, and the rotating angle adjustment and the positioning are carried out through clamping grooves corresponding to different erosion angle positioning holes.

3. The apparatus for improving service life of high Wen Pensha erosion testing machine according to claim 2, wherein a sample stage and a sample heater are arranged in a groove at the top of the heater fixing device, the sample stage is arranged on the sample heater, the sample is arranged on the sample stage, and a heater outlet corresponding to one side of the sample heater is arranged on the heater fixing device.

4. The device capable of prolonging service life of a high Wen Pensha erosion testing machine according to claim 1, wherein the sample heater is provided with a high-temperature alloy shell, a ceramic protective sleeve and a platinum-rhodium heating wire, the ceramic protective sleeve is laid in the high-temperature alloy shell, the platinum-rhodium heating wire sequentially penetrates through the ceramic protective sleeve and is led out from two shell wire outlets at two ends, a high-temperature alloy cover plate is arranged at the top of the high-temperature alloy shell, square bosses are arranged on the periphery of the upper edge of the high-temperature alloy cover plate to serve as sample tables, and a test sample is fixed through the sample tables.

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