A halogen lamp complex gradient thermal fatigue test device with liquid cooling isolation layer of the specimen

Abstract

The present invention discloses a halogen lamp complex gradient thermal fatigue test device with a specimen liquid cooling isolation layer, comprising a sheet metal outer cover box body (1) with a hexagonal cross section, a box body upper cover (2) arranged on the top of the sheet metal outer cover box body (1), a quartz lamp holder (3) and a plurality of quartz lamp tubes (4) arranged in the sheet metal outer cover box body (1), and a specimen quartz isolation cover (5) arranged on the quartz lamp holder (3). The present invention can heat a small area specimen to be tested with a high temperature gradient, and can perform salt spray and water mist cooling treatment on the small area specimen. The quartz protective cover also has the function of protecting the quartz glass lamp tube and extending its service life. Therefore, the present invention realizes an economical, safe, clean, quiet, flexible and efficient gradient thermal shock test device.

Description

Technical Field

[0001] The present invention relates to a complex gradient thermal fatigue heating device of a halogen lamp with a liquid cooling isolation layer of a specimen, which is suitable for thermal fatigue heating experiments of small-area complex curved surface structures and can be used for simulating high temperature tests in extreme thermal environments or rarefied flow environments such as aircraft engine blades and small high-temperature thermal structural parts. Background Art

[0002] Aircraft engines are the "crown jewel of modern industry" and an important symbol of a country's comprehensive scientific and technological level, the strength of its scientific and technological industrial foundation, and its comprehensive national strength. With the improvement of aircraft performance, the thrust-to-weight ratio required of aircraft engines has also become higher. With the improvement of aircraft engine performance, the gas temperature at the high-pressure turbine inlet of aircraft engines will increase, which puts extremely stringent requirements on the service life of aircraft engine blades. For aircraft engine blades, which contain flow channels and high temperature gradients (local heating temperature is greater than 200℃ / cm), more advanced thermal testing methods are required.

[0003] At present, for the thermal fatigue assessment of test pieces containing flow channels inside aircraft engine blades, the current methods are: using high-frequency electromagnetic induction to adjust the position of high-frequency induction heating components according to the required heating surface, which makes it difficult to heat the complete experimental workpiece; using quartz lamps to adjust the position of the workpiece containing flow channels inside the blade, arranging exposed quartz lamp heating tubes between the brackets, and performing heating tests on the curved surface. Among them, it is difficult to force cooling of quartz lamp heating tubes, and the wires of quartz lamp tubes are directly connected to the heating control power bus. During the experiment, the heated curved surface is first pushed into the bracket of the heating equipment. Traditional heating methods have the following problems:

[0004] 1. For exposed quartz lamp heating tube, the radiation from the back of the tube cannot be efficiently utilized in the heating process.

[0005] 2. Single customized equipment is not adaptable to pneumatic heating tests on curved surfaces of different types and sizes.

[0006] 3. The temperature field distribution of aircraft engine blades is complex, the temperature gradient is large, and the area of ​​the blades is small. For customized equipment, the control system is difficult to write and the experimental cycle is long.

[0007] 4. When cooling the test piece, the coolant may splash onto the quartz lamp, causing greater thermal stress on the surface of the quartz lamp and causing damage.

[0008] 5. It is impossible to simulate the rarefied flow environment at high altitude or even the vacuum environment, and it is also impossible to use protective gas to conduct experiments. Summary of the invention

[0009] In order to solve the above problems, the present invention provides a halogen lamp with a liquid cooling interlayer and a flat heating device, which has the characteristics of compact structure, stable performance, large-scale modular splicing, easy temperature control and better efficiency. At the same time, an adaptive protective cover is added to protect the quartz lamp tube to extend its service life, and also creates conditions for further experiments such as high-altitude rarefied flow.

[0010] The present invention is achieved by adopting the following technical solutions:

[0011] A halogen lamp complex gradient thermal fatigue test device with a specimen liquid cooling isolation layer, comprising a sheet metal housing box body with a hexagonal cross section, a box body upper cover arranged on the top of the sheet metal housing box body, a quartz lamp holder and a plurality of quartz lamp tubes arranged in the sheet metal housing box body, and a specimen quartz isolation cover arranged on the quartz lamp holder;

[0012] The quartz lamp holder is provided with a plurality of quartz lamp slots, on which a plurality of quartz lamp tubes are evenly arranged in the circumferential direction. Three identical first cooling pipelines, second cooling pipelines and third cooling pipelines are arranged in the three non-adjacent first wall surfaces, third wall surfaces and fifth wall surfaces of the sheet metal cover box body. In order to ensure the uniform flow of cooling water, a flow mode of bottom-in and top-out is adopted, wherein the lower right hole on each wall surface is the water inlet of the first side wall water cooling pipeline, the upper right hole is the water outlet of the first side wall water cooling pipeline, and the lower left hole is the water outlet of the second side wall water cooling pipeline. The upper left hole is the water inlet of the side wall water cooling pipe, and the upper left hole is the water outlet of the second side wall water cooling pipe; in the first cooling pipe on the first wall, the coolant flows into the sheet metal outer cover box from the water inlet of the first side wall water cooling pipe, flows out from the water outlet of the first side wall water cooling pipe, and then transfers to the water inlet of the second side wall water cooling pipe, and then flows out from the water outlet of the second side wall water cooling pipe; the upper cover of the box body is arranged with an upper cover inner coolant pipe, the coolant flows in from the water inlet of the upper cover water cooling pipe, and flows out from the water outlet of the upper cover water cooling pipe along the channel.

[0013] A further improvement of the present invention is that the lamp tube coolant starts from the water cooling pipe in the upper cover, flows into the water inlet of the upper cover water cooling pipe, and then passes through the water outlet of the upper cover water cooling pipe, the first water cooling pipe on the first wall, the second water cooling pipe on the third wall, and the third water cooling pipe on the fifth wall in sequence, and then flows out for a subsequent industrial cooling cycle process.

[0014] A further improvement of the present invention is that a threaded hole is provided on the upper cover of the box body, and the hole diameter thereof is equal to the outer diameter of the quartz isolation cover of the specimen. The quartz isolation cover of the specimen is inserted into the sheet metal outer cover box body to separate the specimen and the quartz lamp tube, thereby protecting the lamp tube and realizing a closed environment thermal fatigue test. After the insertion, a threaded cover is screwed into the threaded hole of the upper cover of the box body to play a sealing role. A slot for fixing the quartz glass cover on the lower bottom surface is provided on the bottom surface of the sheet metal outer cover box body, thereby facilitating the fixing of the quartz isolation cover of the specimen.

[0015] A further improvement of the present invention is that a lower boss for fixing the test piece extends above the threaded cover to support the test piece.

[0016] A further improvement of the present invention is that the threaded cover, the slot for fixing the quartz glass cover and the lower boss for fixing the test piece are penetrated by the threaded hole on the threaded cover and the threaded hole penetrating the lower boss and the bottom surface of the box body. In the closed experiment, the threaded hole on the threaded cover and the threaded hole penetrating the lower boss and the bottom surface of the box body are closed by bolts to play a sealing role. In the air circulation experiment, the threaded hole on the threaded cover can be connected to the water cooling pipe and the air cooling pipe to play a role in temperature control of the test piece.

[0017] A further improvement of the present invention is that three circular holes of the same size are respectively opened on the second wall, the fourth wall and the sixth wall of the sheet metal outer cover box as observation holes, and the temperature of the test piece is measured by infrared temperature measurement technology; quartz glass is inlaid in the observation hole, and a layer of disc-shaped mullite insulation board is added on the outside of the quartz glass to play a role in thermal insulation.

[0018] The present invention has at least the following beneficial technical effects:

[0019] 1. The quartz lamp heating method is a remote non-contact heating method. Its principle is to convert the electrical energy input into a high-efficiency heat source of infrared radiation. Compared with gas heating, its temperature distribution, size and rise and fall rate are greatly improved, and the quartz lamp also has the advantages of being quiet and clean;

[0020] 2. The quartz lamp heating method has a larger heating area than laser and other heating methods, and the heating is not easily restricted by the heated material.

[0021] 3. The device isolates the specimen from the quartz lamp heating components through the specimen quartz isolation cover, achieving the function of rapid cooling of the specimen by salt spray and water mist while achieving the heating of the specimen in a small range. Further, the quartz lamp is isolated from the specimen through the specimen quartz isolation cover while ensuring that the heating capacity of the quartz lamp is not lost. At the same time, the quartz lamp heating components separated by the specimen quartz isolation cover have the ability to use independent centralized cooling, which is not affected by the cooling method of the blades inside the specimen quartz isolation cover, further improving the capacity of the quartz heating components.

[0022] 5. The power of each independent quartz lamp is independently controlled by the control system, and the heating of the device is easy to control and adjust on a large scale.

[0023] 6. The back of the quartz lamp tube is coated with reflective paint to reduce the irradiation effect of the heating light on the rear side wall, further enhance the irradiation intensity of the front radiated surface, and improve the heating efficiency of the heating surface.

[0024] 7. It adopts modular design concept, control theory, and independent cooling unit. At the same time, the temperature of a single device is always stable during the heating process and normal operation. Compared with the traditional quartz lamp heating technology, it can be spliced ​​and combined on a large scale and applied to the heating of large areas and complex surfaces.

[0025] 8. The quartz glass cover inserted in the middle separates the experimental object from the lamp assembly, which can effectively prevent the sprayed coolant from splashing onto the quartz lamp, and prevent the temperature difference between the inside and outside of the quartz lamp from being too large, resulting in large thermal stress and causing damage to the quartz lamp. In addition, the upper and lower spray holes are closed to form a closed space, and the protective gas can be filled in the glass cover, or the air can be pumped to simulate the real high-altitude rarefied flow environment.

[0026] 9. The three reserved observation windows are used for infrared temperature measurement technology to measure the temperature of the test piece in real time.

[0027] In summary, the present invention provides a halogen lamp complex gradient thermal fatigue test device with a liquid cooling isolation layer for a specimen, which can perform gas cooling on a high-density complex quartz lamp array and water mist cooling on the tested workpiece, overcoming the problem that the life of the quartz lamp heating module is rapidly damaged in the water mist and salt fog environment of the specimen. The overall device overcomes the shortcomings of the traditional gas thermal shock test device, such as high cost, high noise pollution, difficult control of temperature distribution size and rise and fall rate, low safety, and the inability of the isothermal thermal cycle test device to achieve gradient thermal shock, and overcomes the shortcomings of the traditional quartz lamp heating device, such as low efficiency, low temperature rise, short continuous heating time, and poor adaptability. At the same time, a large temperature gradient of 200℃ / cm in a very small range of 100℃-1500℃ can be achieved by adjusting the heating power, heating distance, and modular splicing number of the quartz lamp, and the minimum heating area is 70mm. The thermal damage process in the real environment is simulated by adjusting the gas composition in the glass cover. In addition, the designed quartz isolation cover can achieve the cooling of complex structures and the water mist and salt mist cooling of complex structures through isolation test and quartz lamp heating device, while extending its service life. Therefore, the present invention realizes an economical, safe, clean, quiet, flexible and efficient thermal fatigue testing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall view of the present invention.

[0029] Figure 2 (a) to (d) are respectively the front view, rear view, left view and top view of the present invention.

[0030] Figure 3 The main view perspective.

[0031] Figure 4 In (a) and (b), they are Figure 3AA and BB cross-sectional views.

[0032] Figure 5 The main view perspective.

[0033] Figure 6 In (a) and (b), they are Figure 5 CC and DD cross-sectional views.

[0034] In the figure: the bottom surface of the sheet metal housing box is a support surface;

[0035] 1 is a sheet metal outer cover box, 2 is a box cover, 3 is a quartz lamp holder, 4 is a quartz lamp tube, 5 is a test piece quartz isolation cover, 6 is a quartz lamp slot, 7 is a coolant pipeline in the side wall, 8 is a coolant pipeline in the upper cover, 9 is a threaded hole on the box cover, 10 is a threaded cover, 11 is a threaded hole on the threaded cover, 12 is a test piece, 13 is a threaded hole passing through the lower boss and the bottom of the box, 14 is a lower boss for fixing the test piece, 15 is a slot for fixing the quartz glass cover on the lower bottom, and 16 is quartz glass;

[0036] 1-1, 1-2, 1-3, 1-4, 1-5, 1-6 are the first to sixth wall surfaces, 7-1, 7-3, 7-5 are the first to third water-cooling pipes, a, c are the water inlets of the first and second side wall water-cooling pipes, b, d are the water outlets of the first and second side wall water-cooling pipes, e is the water inlet of the upper cover water-cooling pipeline, and f is the water outlet of the upper cover water-cooling pipeline. DETAILED DESCRIPTION

[0037] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0038] like Figure 1 , 2 As shown in Figure 3, the present invention provides a liquid-cooled interlayer halogen lamp and a flat heating device, comprising a sheet metal outer cover box 1, a box cover 2, a quartz lamp holder 3, a quartz lamp tube 4, a quartz isolation cover 5, a quartz lamp slot 6, a coolant pipe 7 in the side wall, a coolant pipe 8 in the upper cover, a threaded hole 9 opened in the hexagonal upper cover, a threaded cover 10, a threaded hole 11 opened on the threaded cover, a test piece 12, a threaded hole 13 passing through a lower boss and a bottom surface of the box, a lower boss 14 for fixing the test piece, a slot 15 for fixing the quartz glass cover on the lower bottom surface, and a quartz glass 16.

[0039] Among them, the hexagonal quartz lamp holder 3 is fixedly connected to the bottom surface of the sheet metal housing box 1, and the quartz lamp holder 3 is processed with quartz lamp slots 6 evenly distributed on the circumference, and the quartz lamp tube 4 is fixed on the quartz lamp slots 6. The hexagonal box cover 2 is connected to the sheet metal housing box 1 by bolts, and a threaded hole 9 is opened on the box cover 2 to facilitate the insertion of the quartz isolation cover 5. The inner side of the slot 15 for fixing the quartz glass cover on the lower bottom surface of the sheet metal housing box 1 is provided with a sealing rubber ring. After the lampshade is inserted, the slot 15 for fixing the quartz glass cover on the lower bottom surface is fixed and sealed. The threaded cover 10 is screwed into the threaded hole 9, and a small threaded hole 11 on the threaded cover is opened in the center of the threaded cover 10 to facilitate the connection of the external air-cooling and water-cooling pipelines. A lower boss 14 for fixing the test piece is provided at the lower bottom surface to fix the test piece. A threaded hole 13 is provided which passes through the lower boss and the bottom surface of the box body, and passes through the lower boss and the bottom surface of the box body, so as to provide an outlet for cooling gas or cooling liquid.

[0040] The first to third cooling liquid channels 7-1, 7-2, 7-3 and the upper cover inner cooling liquid pipe 8 are also opened inside the first wall 1-1, the third wall 1-3, the fifth wall 1-5 of the sheet metal outer cover box 1 and the upper cover 2 of the box body. The lamp tube cooling liquid starts from the upper cover inner cooling liquid pipe 8, flows into the water inlet e of the upper cover water cooling pipeline, and then passes through the water outlet f of the upper cover water cooling pipeline, the first water cooling pipeline 7-1 of the first wall 1-1, the second water cooling pipeline 7-3 of the third wall 1-3, and the third water cooling pipeline 7-5 of the fifth wall 1-5, and then enters the water cooling box for the next cycle.

[0041] The first to third cooling channels 7-1, 7-2, and 7-3 all adopt a bottom-in-top-out flow mode, wherein the lower right hole of each surface is the water inlet a of the first side wall water cooling pipe, the upper right hole is the water outlet b of the first side wall water cooling pipe, the lower left hole is the water inlet c of the second side wall water cooling pipe, and the upper left hole is the water outlet d of the second side wall water cooling pipe. For example, in the first cooling pipeline 7-1 of the first wall surface 1-1, the coolant (mainly water-based coolant and oil-based coolant) flows into the box from the water inlet a of the first side wall water cooling pipe, flows out from the water outlet b of the first side wall water cooling pipe, and then transfers to the water inlet c of the second side wall water cooling pipe, and then flows out from the water outlet d of the second side wall water cooling pipe, and is connected to the water inlet a of the first side wall water cooling pipe of the second water cooling pipe 7-3, thereby circulating.

[0042] The sheet metal housing 1 is made of stainless steel by direct bending. The back of the lamp tube is sprayed with a high temperature resistant coating, so that the back of the lamp tube has a total reflectivity of 80-85%.

[0043] Furthermore, by adjusting the number of lamp tube groups, changing the length of the lamp tube groups, and making adaptive changes to the external structural parts, the size and power of a single lamp module can be improved. The shape of the lamp tube interlayer can be changed, and the structural parts can be adaptively changed to achieve the purpose of adaptive changes in the required heating surface. For part of the surface of the structural parts and the lamp tube, a heat insulation coating is sprayed to reduce the actual working temperature of some parts. The number and diameter of the coolant inlet and outlet are adjusted, and the layout range and distance of the internal coolant pipeline are adjusted to improve the cooling efficiency of the coolant.

[0044] Furthermore, the entire device can be fixed with materials having a temperature resistance of more than 100°C at normal operating temperature (below 1100°C).

[0045] The lower surface of the box is fixed, and the upper cover and side walls of the box are protected by cooling channels.

[0046] The electrical circuit in the lamp adopts high-temperature glass fiber braided insulated wire. The quartz lamp tube adopts tungsten filament halogen heating tube, with a rated voltage of 220V, a rated power of 2KW, and can be adjusted and customized. The heating temperature is as high as 3300K, the radiation energy is stable, and it can achieve 1800℃ remote rapid heating, which is not affected by the surrounding environment and is only effective for the irradiated object. The power of the halogen lamp can be changed by adjusting the power supply. At the same time, this heating method belongs to electrically controlled non-contact heating, which has the advantages of economy, safety, cleanliness, quietness and efficiency, and has a service life of more than 5000 hours.

[0047] The internal cooling pipeline of the heating lamp, the quartz lamp holder and the quartz lamp mounting end are made of the same material and have high thermal conductivity and low thermal expansion coefficient.

[0048] The sheet metal shell is made of stainless steel.

[0049] The present invention provides a halogen lamp and a flat heating device with a liquid cooling interlayer, and the method of using the device is as follows:

[0050] Step 1: Place the device upright, check whether the cooling pipe of the test device is complete, intact, and unblocked, check whether the quartz lamp tube is oily or blocked, and check whether the electrical circuit is short-circuited or exposed. When all items meet the requirements, the equipment safety inspection is completed.

[0051] Step 2: Slowly inject cooling water from the water inlet. When the cooling water flows out of the water outlet, observe whether there are bubbles in the water. When there are no bubbles in the water, increase the cooling water flow rate. When the cooling water flows out of the outlet steadily and without pulsation, the device can be placed in the required heating angle and position to complete the cooling water injection.

[0052] Step 3: Turn on the power, preheat the lamp for one minute according to the actual working conditions, and observe whether there is any problem with the equipment.

[0053] Step 4: Enter the experimental stage, and control the heating power of the lamp tube by controlling the signal changes in the power supply, so as to realize long-term heating or thermal fatigue cycle process.

[0054] Step 5: Observe the cooling condition of the test workpiece in the salt spray cooling atmosphere of the test piece quartz isolation cover, and check whether the test piece quartz isolation cover is damaged in the high temperature environment and whether the quartz is atomized due to high temperature.

[0055] Step 6: After the test, first turn off the power system, and stop injecting coolant after the equipment cools down to room temperature. Finally, drain the excess cooling water in the pipeline to end the heating process.

[0056] The above content is a further detailed description of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation methods of the present invention are limited to these. For ordinary technicians in the technical field of the present invention, several improvements and substitutions can be made without departing from the concept of the present invention, which should be deemed to belong to the scope of patent protection determined by the claims submitted by the present invention.

Claims

1. A halogen lamp complex gradient thermal fatigue test device with a specimen liquid cooling isolation layer, characterized in that: It comprises a sheet metal housing box body (1) with a hexagonal cross section, a box body upper cover (2) arranged on the top of the sheet metal housing box body (1), a quartz lamp holder (3) and a plurality of quartz lamp tubes (4) arranged in the sheet metal housing box body (1), and a test piece quartz isolation cover (5) arranged on the quartz lamp holder (3); A plurality of quartz lamp slots (6) are arranged on the quartz lamp holder (3), and a plurality of quartz lamp tubes (4) are evenly arranged in the circumferential direction. Three identical first water cooling pipes (7-1), second water cooling pipes (7-3), and third water cooling pipes (7-5) are arranged in three non-adjacent first wall surfaces (1-1), third wall surfaces (1-3), and fifth wall surfaces (1-5) of the sheet metal housing box (1). In order to ensure uniform flow of cooling water, a bottom-in-top-out flow mode is adopted, wherein the lower right hole on each wall surface is a water inlet a of the first side wall water cooling pipe, and the upper right hole is a water outlet b of the first side wall water cooling pipe. , the lower left hole is the water inlet c of the second side wall water cooling pipe, and the upper left hole is the water outlet d of the second side wall water cooling pipe; in the first water cooling pipe (7-1) of the first wall surface (1-1), the coolant flows into the sheet metal outer cover box body (1) from the water inlet a of the first side wall water cooling pipe, flows out from the water outlet b of the first side wall water cooling pipe, and then transfers to the water inlet c of the second side wall water cooling pipe, and then flows out from the water outlet d of the second side wall water cooling pipe; the box body upper cover (2) is arranged with an upper cover inner coolant pipe (8), the coolant flows in from the water inlet e of the upper cover water cooling pipe, and flows out from the water outlet f of the upper cover water cooling pipe along the channel; The lamp tube cooling liquid starts from the cooling liquid pipeline (8) in the upper cover, flows into the water inlet e of the upper cover water cooling pipeline, and then passes through the water outlet f of the upper cover water cooling pipeline, the first water cooling pipeline (7-1) of the first wall surface (1-1), the second water cooling pipeline (7-3) of the third wall surface (1-3), and the third water cooling pipeline (7-5) of the fifth wall surface (1-5), and then flows out to perform a subsequent industrial cooling cycle process; The upper cover (2) of the box body is provided with a first threaded hole (9), the diameter of which is the same as the outer diameter of the test piece quartz isolation cover (5). The test piece quartz isolation cover (5) is inserted into the sheet metal outer cover box body (1) to separate the test piece (12) and the quartz lamp tube (4), thereby protecting the lamp tube and realizing a closed environment thermal fatigue test. After the insertion, a threaded cover (10) is screwed into the first threaded hole (9) of the upper cover (2) of the box body to achieve a sealing effect. A clamping groove (15) for fixing the test piece quartz isolation cover is provided on the bottom surface of the sheet metal outer cover box body, thereby facilitating the fixing of the test piece quartz isolation cover (5).

2. A halogen lamp complex gradient thermal fatigue test device with a specimen liquid cooling isolation layer according to claim 1, characterized in that: A lower boss (14) for fixing the test piece extends from the top of the threaded cover (10) and plays a role in supporting the test piece (12).

3. A halogen lamp complex gradient thermal fatigue test device with a specimen liquid cooling isolation layer according to claim 2, characterized in that: The threaded cover (10), the slot (15) for fixing the test piece quartz isolation cover and the lower boss (14) for fixing the test piece are all penetrated by the second threaded hole (11) on the threaded cover and the third threaded hole (13) penetrating the lower boss and the bottom surface of the box body. In a closed experiment, the second threaded hole (11) on the threaded cover and the third threaded hole (13) penetrating the lower boss and the bottom surface of the box body are closed by bolts to play a sealing role. In an air circulation experiment, the second threaded hole (11) on the threaded cover can be connected to a water cooling pipe and an air cooling pipe to play a role in temperature control of the test piece (12).

4. The halogen lamp complex gradient thermal fatigue test device of the specimen liquid cooling isolation layer according to claim 1, characterized in that: Three circular holes of the same size are respectively opened on the second wall surface (1-2), the fourth wall surface (1-4) and the sixth wall surface (1-6) of the sheet metal outer casing body (1) to serve as observation holes for measuring the temperature of the test piece using infrared temperature measurement technology; quartz glass (16) is embedded in the observation hole, and a layer of circular mullite heat insulation board is added on the outer side of the quartz glass (16) to play a role in heat preservation and heat insulation.

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