A thermal protection and cooling device for non-contact temperature measurement infrared probe

Abstract

The present invention provides a thermal protection and cooling device for a non-contact temperature measurement infrared probe, comprising a thermal protection sleeve, an air intake structure and an air outlet structure; the thermal protection sleeve comprises an outer stainless steel tube (1), a middle stainless steel tube (2), an inner stainless steel tube (3) and heat dissipation fins (5) arranged concentrically; the air intake structure comprises an air intake nozzle (8), a nitrogen air intake cover (9), a cover plate (10), a flow equalizing plate (11) and a collimating tube (13); the air outlet structure comprises a nitrogen air outlet cover (14) and a mounting support plate (16); the air intake structure is used to allow the cooling gas entering through the air intake nozzle (8) to evenly purge the heat dissipation fins (5) under the action of the flow equalizing plate (11), and to allow the cooling gas entering through the cover plate (10) and the collimating tube (13) to purge the cavity of the inner stainless steel tube (3). The present invention can ensure the stable operation of the infrared probe in a high temperature environment.

Description

Technical Field

[0001] The invention belongs to the technical field of heat exchange equipment, and in particular relates to a thermal protection and cooling device for a non-contact temperature measuring infrared probe. Background Art

[0002] Aircraft engines are sophisticated and complex thermal machines. Their performance directly impacts an aircraft's reliability, safety, and economic performance. Their development also reflects a country's overall strength in science, technology, defense, and industry. Advances in aircraft engine development depend largely on the development of various testing technologies, such as those for temperature, flow, pressure, stress, and vibration. Temperature is a crucial parameter in engine design and analysis.

[0003] The turbine disk is a critical component in gas turbine engines, and its performance is a significant factor influencing aircraft engine performance. The currently widely used method for measuring turbine disk temperature is still traditional thermocouples, which are inconvenient to install and can easily affect test efficiency. To enable non-contact temperature measurement within the turbine disk under high temperatures, high rotation speeds, and strong vibration conditions, research into infrared temperature measurement technology is needed. Current infrared temperature sensors have a maximum operating temperature of 50°C. However, the turbine disk cavity of an aircraft engine is subject to heat transfer through three modes: conduction, convection, and radiation. This complex heat transfer pattern within the cavity is highly susceptible to sensor performance. To enable infrared sensors to measure the temperature of the turbine disk for extended periods while the engine is operating, it is crucial to redesign the thermal protection and cooling structures of existing infrared probes. Summary of the Invention

[0004] The purpose of the present invention is to provide a thermal protection and cooling device for a non-contact temperature measuring infrared probe, so as to ensure the stable operation of the infrared probe in a high temperature environment.

[0005] The present invention provides a thermal protection and cooling device for a non-contact temperature measuring infrared probe, comprising a thermal protection sleeve, an air inlet structure and an air outlet structure;

[0006] The heat protection sleeve comprises an outer stainless steel tube, a middle stainless steel tube, an inner stainless steel tube, and heat dissipation fins arranged concentrically; the front end of the heat protection sleeve comprises a vacuum insulation layer formed by the outer stainless steel tube and the middle stainless steel tube, and a heat pipe layer formed by the middle stainless steel tube and the inner stainless steel tube; the rear end of the heat protection sleeve comprises a heat pipe layer formed by the middle stainless steel tube and the inner stainless steel tube; the heat dissipation fins are sleeved on the outer wall of the middle stainless steel tube at the rear end of the heat protection sleeve by an interference fit; the vacuum insulation layer and the heat pipe layer ports at the front end of the heat protection sleeve are sealed by a front cover; the heat pipe layer ports at the rear end of the heat protection sleeve are sealed by a rear cover; the heat pipe layer is filled with acetone working medium; the inner stainless steel tube cavity is used to place an infrared sensor; a glass window is installed at the front opening of the inner stainless steel tube;

[0007] The air inlet structure includes an air inlet nozzle, a nitrogen air inlet cover, a cover plate, a flow equalizing plate, and a collimator; the air outlet structure includes a nitrogen air outlet cover and a mounting support plate;

[0008] The air inlet nozzle is installed on the nitrogen air inlet hood by means of a threaded connection. One end of the nitrogen air inlet hood is connected to the cover plate by a bolt, and the other end is connected to the flow equalizing plate and the nitrogen air outlet hood by a bolt; the rear end of the heat protection sleeve is installed in the nitrogen air outlet hood, and the nitrogen air outlet hood is provided with an air outlet in a circumferential direction close to the front end of the heat protection sleeve, and the nitrogen air outlet hood is fixed to the mounting support plate by bolts; the collimator tube is provided in the nitrogen air inlet hood and is coaxially connected to the inner stainless steel tube; the air inlet structure is used to make the cooling gas entering from the air inlet nozzle evenly purge the heat dissipating fins under the action of the flow equalizing plate, and make the cooling gas entering from the cover plate and the collimator tube purge the cavity of the inner stainless steel tube.

[0009] Furthermore, the glass window is glued with high-temperature glue, or installed by fastening with a knob.

[0010] Furthermore, the rear end cover is provided with a liquid filling pipe for filling the working medium.

[0011] Furthermore, a layer of nickel powder or stainless steel powder with a thickness of 0.3-0.4 is sintered on the inner wall of the middle stainless steel tube, the powder particle size is 100-300 mesh, and the porosity is greater than or equal to 50%, which is used to provide capillary force for the reflux of the working medium in the heat pipe layer.

[0012] Furthermore, the outer surface of the outer stainless steel tube is sprayed with a high reflectivity material.

[0013] Furthermore, three circular grooves are provided inside the front end cover for inserting the outer stainless steel tube, the middle stainless steel tube, and the inner stainless steel tube; two circular grooves are provided inside the rear end cover for inserting the middle stainless steel tube and the inner stainless steel tube, and are equipped with a filling hole connected to the liquid filling tube.

[0014] Furthermore, the heat dissipation fins adopt a cylindrical structure.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention can ensure the stable operation of the infrared probe in a high-temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A perspective view of the thermal protection and cooling device for a non-contact temperature measurement infrared probe according to the present invention;

[0018] Figure 2 A cross-sectional view of the thermal protection and cooling device for a non-contact temperature measurement infrared probe according to the present invention;

[0019] Figure 3 This is an exploded view of the thermal protection and cooling device for the non-contact temperature measurement infrared probe of the present invention;

[0020] Figure 4 An exploded view of the thermal protection sleeve of the present invention;

[0021] Figure 5 A schematic diagram of a turbine disk of a thermal protection and cooling device for mounting a non-contact temperature measurement infrared probe in accordance with an embodiment of the present invention;

[0022] Figure 6 Schematic diagram of a non-contact temperature measurement infrared probe thermal protection and cooling device installed on a turbine disk in one embodiment of the present invention.

[0023] Numbers in the figure:

[0024] 1-Outer stainless steel tube; 2-Middle stainless steel tube; 3-Inner stainless steel tube; 4-Rear end cover; 5-Heating fins; 6-Front end cover; 7-Glass window; 8-Air inlet nozzle; 9-Nitrogen inlet cover; 10-Cover plate; 11-Flow equalizing plate; 12-Bolt; 13-Collimator; 14-Nitrogen outlet cover; 15-Air outlet; 16-Mounting support plate; 17-Filling port; 18-Turbine disc; 19-Thermal protection sleeve mounting hole. DETAILED DESCRIPTION

[0025] The present invention is described in detail below with reference to the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in this field based on these embodiments are all within the scope of protection of the present invention.

[0026] Ginseng Figures 1 to 4As shown, this embodiment provides a thermal protection and cooling device for a non-contact temperature measurement infrared probe, including a thermal protection sleeve, an air inlet structure, and an air outlet structure.

[0027] The thermal protection sleeve includes an outer stainless steel tube 1, a middle stainless steel tube 2, an inner stainless steel tube 3, and heat dissipation fins 5 arranged concentrically. The stainless steel tubes of different diameters are connected by welding. The front end of the thermal protection sleeve includes a vacuum insulation layer formed by the outer stainless steel tube 1 and the middle stainless steel tube 2, and a heat pipe layer formed by the middle stainless steel tube 2 and the inner stainless steel tube 3. The rear end of the thermal protection sleeve includes a heat pipe layer formed by the middle stainless steel tube 2 and the inner stainless steel tube 3. The vacuum insulation layer is used to isolate part of the heat, and the heat pipe layer is used to transmit heat. The heat dissipation fins 5 are fitted onto the outer wall of the middle stainless steel tube 2 at the rear end of the thermal sleeve using an interference fit. When the outer stainless steel tube is heated, the heat is dissipated through the fins. The vacuum insulation layer and the heat pipe layer ports at the front end of the thermal sleeve are sealed with a front cover 6, forming a double hollow cylindrical layer. The heat pipe layer ports at the rear end of the thermal sleeve are sealed with a rear cover 4. The heat pipe layer is filled with acetone. The cavity of the inner stainless steel tube 3 is used to house the infrared sensor. A glass window 7 is installed at the front opening of the inner stainless steel tube 3 to partially isolate the external heat. The overall length of the thermal sleeve is ultimately determined by factors such as the heat load, background radiation shielding efficiency, and the required location during test installation. During operation, the middle stainless steel tube is heated, and the working fluid within the heat pipe layer removes a large amount of heat through phase change and transports it to the fins. The heat is then dissipated into the atmosphere through heat conduction and convection.

[0028] The air inlet structure includes an air inlet nozzle 8, a nitrogen air inlet cover 9, a cover plate 10, a flow equalizing plate 11, and a collimator 13; the air outlet structure includes a nitrogen air outlet cover 14 and a mounting support plate 16;

[0029] The air inlet nozzle 8 connected to the external cold air source is installed on the nitrogen air inlet cover 9 by means of a threaded connection. One end of the nitrogen air inlet cover 9 is connected to the cover plate 10 by a bolt, and the other end is connected to the flow equalizing plate 11 and the nitrogen air outlet cover 14 by a bolt 12. The axis of the cover coincides with the axis of the heat protection sleeve; the rear end of the heat protection sleeve is installed in the nitrogen air outlet cover 14, and the nitrogen air outlet cover 14 is provided with an air outlet 15 in the annular direction near the front end of the heat protection sleeve. The position of the air outlet of the nitrogen air outlet cover corresponds to the position of the cold end fin, which can ensure that the heated gas flows out smoothly. When in use, the cooling gas is discharged from the nitrogen outlet The nitrogen outlet hood 14 is fixed to the mounting support plate 16 by bolts. The mounting support plate can be adjusted to its mounting aperture according to different usage environments to meet different usage requirements, so as to ensure that the overall structure will not shake during operation. The collimator 13 is arranged in the nitrogen inlet hood 9 and is coaxially connected to the inner stainless steel tube 3. The air intake structure is used to allow the cooling gas entering through the air inlet nozzle 8 to evenly sweep the heat dissipation fins 5 under the action of the equalizing plate 11, and to allow the cooling gas entering through the cover plate 10 and the collimator 13 to sweep the cavity of the inner stainless steel tube 3. During use, cold air enters from the air inlet nozzle and the cover plate, and after being divided by the equalizing plate and the collimator, it forms two air flows, which respectively sweep the fins of the thermal protection sleeve structure and the inner cavity of the inner stainless steel tube, thereby ensuring that the temperature of the infrared sensor placed in the inner stainless steel cavity is lower than its maximum operating temperature. To improve cooling efficiency, use nitrogen or another cooling gas to cool the fins. The dimensions of the nitrogen inlet and outlet hoods match the dimensions of the fin ends to ensure smooth ventilation. To ensure a stable and continuous flow of cooling gas, connect an external source with a certain pressure to the inlet nozzle. The installation diameter of the inlet nozzle is 12mm, so the corresponding connection part of the external gas source should also be 12mm.

[0030] The thermal protection and cooling device of the non-contact temperature measurement infrared probe can ensure the stable operation of the infrared probe in a high temperature environment. It is simple to assemble, easy to operate and has excellent performance.

[0031] In this embodiment, the glass window 7 can be glued with high temperature glue or installed by a knob fastening method. Note that the knob method must ensure that it does not fall off at high temperatures.

[0032] In this embodiment, the rear end cover 4 is equipped with a filling pipe 17 for filling the working medium. The filling pipe 17 has an outer diameter of 1 mm and an inner diameter of 0.5 mm. After the working medium is filled, the filling pipe needs to be clamped and repaired by welding to prevent leakage of the working medium.

[0033] In this embodiment, a layer of nickel powder or stainless steel powder with a thickness of 0.3-0.4 is sintered on the inner wall of the middle stainless steel tube 2. The powder particle size is 100-300 mesh and the porosity is greater than or equal to 50%, which is used to provide capillary force for the backflow of the working medium in the heat pipe layer.

[0034] In this embodiment, the outer surface of the outer stainless steel tube 1 is sprayed with a high reflectivity material to improve the heat insulation effect of the vacuum shell.

[0035] In this embodiment, the front end cover 6 has three internal circular grooves for inserting the outer stainless steel tube 1, the middle stainless steel tube 2, and the inner stainless steel tube 3. Due to the small spacing, CNC machining is used to form the grooves. The rear end cover 4 has two internal circular grooves for inserting the middle stainless steel tube 2 and the inner stainless steel tube 3, and is equipped with a filling hole connected to the liquid filling tube 17. After CNC machining, the filling hole is punched through using a laser drilling machine. To ensure the correct fit of the three layers of stainless steel tubes in the thermal protection sleeve, the stainless steel tube of the outermost sleeve must have an inner diameter of 19 mm and an outer diameter of 20 mm. After positioning, the weld spots of the front end cover and the rear end cover of this layer must be polished. The inner diameter of the middle stainless steel tube is 14.4 mm, and a metal powder-type liquid wick is sintered on the inner wall of the tube. After sintering, it is welded to the front and rear end covers. The inner stainless steel tube has an inner diameter of 10mm and an outer diameter of 11.6mm and is welded to the front and rear end covers. The inner diameter of the front end cover is 9mm, and the stainless steel tube is inserted into the front end cover and welded on the outer ring of the tube. The rear end cover needs to be flush with the inner diameter of the stainless steel tube, which is 10mm, because the infrared probe needs to be inserted deeper. The inner and outer diameters of the three-layer stainless steel tube have tolerance requirements and are processed using wire cutting technology. After the parts are processed, except for the heat sink fins, the remaining parts are welded by induction diffusion welding to reduce the heat transfer resistance.

[0036] In this embodiment, the heat dissipation fins 5 are cylindrical in structure, arranged circumferentially, with an inner diameter of 16 mm, a tolerance of -0.1 to 0, and an outer diameter of 32 mm. They are formed by wire cutting technology and finally tightly fitted to the outer wall of the middle stainless steel tube by heat sleeve.

[0037] During the operation of an aircraft engine, the temperature of the turbine disk 18 will rise significantly. Conventional thermocouple temperature measurement methods are relatively difficult to operate, have a high potential for damage to the turbine disk, and require relatively large temperature measurements (contact temperature measurement has a certain impact on the original ambient temperature field). Therefore, it is considered to use infrared temperature measurement to measure temperature. To ensure that the infrared sensor, electrical components, and leads can be used normally within their operating temperature range, they are placed in the inner stainless steel tube cavity of the thermal protection and cooling device of the non-contact temperature measurement infrared probe provided in this embodiment. The vacuum insulation layer formed by the outer stainless steel tube and the middle stainless steel tube can serve as a vacuum insulator with good thermal insulation effect, and has a good blocking effect on heat from the turbine disk cavity. The heat pipe layer formed by the middle stainless steel tube and the inner stainless steel tube has excellent thermal conductivity and can transport heat to the fin part of the thermal protection sleeve through phase change heat transfer, preventing heat from accumulating at the placement position of the infrared sensor and affecting the normal operation of the sensor.

[0038] Ginseng Figure 5 、 Figure 6 As shown, when measuring the temperature of the turbine disk surface, the assembled heat protection and cooling device needs to be installed on the turbine disk support plate through the six heat protection sleeve installation holes 19.

[0039] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

Claims

1. A thermal protection and cooling device for a non-contact temperature measuring infrared probe, characterized in that: Including heat protection sleeve, air inlet structure and air outlet structure; The heat protection sleeve comprises an outer stainless steel tube (1), a middle stainless steel tube (2), an inner stainless steel tube (3) and heat dissipation fins (5) arranged concentrically; the front end of the heat protection sleeve comprises a vacuum heat insulation layer formed by the outer stainless steel tube (1) and the middle stainless steel tube (2), and a heat pipe layer formed by the middle stainless steel tube (2) and the inner stainless steel tube (3); the rear end of the heat protection sleeve comprises a heat pipe layer formed by the middle stainless steel tube (2) and the inner stainless steel tube (3); the heat dissipation fins (5) are sleeved on the outer wall of the middle stainless steel tube (2) at the rear end of the heat protection sleeve by means of interference fit; the vacuum heat insulation layer and the heat pipe layer ports at the front end of the heat protection sleeve are blocked by a front end cover (6); the heat pipe layer ports at the rear end of the heat protection sleeve are blocked by a rear end cover (4); the heat pipe layer is filled with acetone working medium; the cavity of the inner stainless steel tube (3) is used to place an infrared sensor; a glass window (7) is installed at the front end opening of the inner stainless steel tube (3); The air intake structure includes an air intake nozzle (8), a nitrogen air intake cover (9), a cover plate (10), a flow equalizing plate (11), and a collimating tube (13); the air outlet structure includes a nitrogen air outlet cover (14) and a mounting support plate (16); The air inlet nozzle (8) is installed on the nitrogen air inlet cover (9) by means of a threaded connection. One end of the nitrogen air inlet cover (9) is connected to the cover plate (10) by means of a bolt, and the other end is connected to the flow equalizing plate (11) and the nitrogen air outlet cover (14) by means of a bolt (12); the rear end of the heat protection sleeve is installed in the nitrogen air outlet cover (14), and the nitrogen air outlet cover (14) is provided with an air outlet (15) in a circumferential direction close to the front end of the heat protection sleeve. 4) is fixed to the mounting support plate (16) by bolts; the collimator (13) is arranged in the nitrogen inlet cover (9) and is coaxially connected to the inner stainless steel tube (3); the air intake structure is used to make the cooling gas entering from the air inlet nozzle (8) evenly blow the heat dissipation fins (5) under the action of the flow equalizer (11), and make the cooling gas entering from the cover plate (10) and the collimator (13) blow the cavity of the inner stainless steel tube (3); The glass window (7) is glued with high-temperature glue or installed by fastening with a knob; The rear end cover (4) is provided with a liquid filling pipe (17) for filling a working medium.

2. The thermal protection and cooling device for the non-contact temperature measurement infrared probe according to claim 1 is characterized in that: A layer of nickel powder or stainless steel powder with a thickness of 0.3-0.4 mm is sintered on the inner wall of the middle stainless steel tube (2), the powder particle size is 100-300 mesh, and the porosity is greater than or equal to 50%, which is used to provide capillary force for the reflux of the working medium in the heat pipe layer.

3. The thermal protection and cooling device for the non-contact temperature measurement infrared probe according to claim 1 is characterized in that: The outer surface of the outer stainless steel tube (1) is sprayed with a high reflectivity material.

4. The thermal protection and cooling device for the non-contact temperature measurement infrared probe according to claim 1, characterized in that: The front end cover (6) is provided with three circular grooves for inserting the outer stainless steel tube (1), the middle stainless steel tube (2), and the inner stainless steel tube (3); the rear end cover (4) is provided with two circular grooves for inserting the middle stainless steel tube (2) and the inner stainless steel tube (3), and is provided with a filling hole connected to the liquid filling tube (17).

5. The thermal protection and cooling device for the non-contact temperature measurement infrared probe according to claim 1 is characterized in that: The heat dissipation fins (5) adopt a cylindrical structure.

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