Non-destructive surface state infrared detection system and control method for heat pipe pre-embedded effect

Abstract

The present invention belongs to the field of aerospace thermal control technology, and discloses a non-destructive surface state infrared detection system and control method for the pre-embedded effect of heat pipes. A flexible heating plate is placed on the upper surface of a flexible coating protective layer, covering one end of the embedded heat pipe; a temperature measuring element is fixed on the upper side of the flexible heating plate, and the temperature measuring element is connected to a temperature controller; an insulating layer is covered on the upper side of the flexible coating protective layer, and an infrared thermal imager is provided above the flexible coating protective layer, and the infrared thermal imager is fixed on a support frame. The present invention does not cause damage to the surface state of the tested piece, can obtain the temperature distribution of the surface of the tested piece in real time, intuitively judge the pre-embedded effect of the embedded heat pipe, and locate the area of the entire embedded piece with poor pre-embedded effect; the support frame has a 6-degree-of-freedom adjustment capability, can realize 3-dimensional translation and rotation, adjust the observation range of the infrared thermal imager, and the infrared thermal imager can perform real-time online measurement.

Description

Technical Field

[0001] The present invention belongs to the field of aerospace thermal control technology, and in particular relates to a non-destructive surface state infrared detection system and a control method for heat pipe pre-embedded effects. Background Art

[0002] Currently, pre-embedding heat pipes within structural components to enhance heat transfer or improve temperature uniformity has become a common process in aerospace thermal control. After heat pipes are embedded in the structural component, heat transfer testing is performed to determine whether the embedding effect meets design requirements. If the embedding effect does not meet design requirements, rework and re-embedding are required.

[0003] Currently, the effectiveness of pre-embedded components is tested by attaching a heater to one end of the embedded heat pipe in the area on the exterior surface of the structural component where the heat pipe is pre-embedded. Temperature measuring elements are evenly attached to the structural component, and the temperature of the temperature measuring elements is observed after heating. The heater and temperature measuring elements are directly attached to the structural component. This direct contact testing can damage the surface condition of the structural component after the surface treatment and coating are applied. Furthermore, the temperature measuring elements are distributed in a point-like pattern on the structural component, and the position of the temperature measuring elements is determined by the tester's experience. The test data is related to the number and location of the temperature measuring elements, and it is impossible to intuitively obtain the overall pre-embedded effect of the structural component.

[0004] Through the above analysis, the problems and defects of the existing technology are as follows: the existing direct contact testing device will damage the surface condition of the structural parts, and the temperature measuring elements are distributed in a point-like manner on the structural parts. The position of the temperature measuring elements is determined by the experience of the inspection personnel. The test data is related to the number and position of the temperature measuring elements, and the overall pre-embedded effect of the structural parts cannot be intuitively obtained.

[0005] The need to determine the overall pre-embedded effect of a structural component without damaging the component surface is inconsistent with current contact measurement methods and requires a change in these methods. This invention provides a non-contact measurement method that can obtain the overall temperature field of a structural component without directly contacting the component surface, allowing even inexperienced personnel to quickly determine the overall pre-embedded effect of a structural component. Summary of the Invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a non-destructive surface condition infrared detection system and control method for the pre-embedded effect of heat pipes, which does not destroy the surface condition of structural parts, is easy to carry and has high measurement accuracy.

[0007] The present invention is achieved by providing a non-destructive infrared detection method for the surface condition of a heat pipe pre-embedded effect, the non-destructive infrared detection method for the surface condition of a heat pipe pre-embedded effect comprising:

[0008] Cover the surface of the detected part with a coating protection layer, ensuring that the protection layer closely adheres to the surface of the detected part under the action of electrostatic adsorption;

[0009] Confirm the position of the embedded heat pipe, and place the flexible heating plate on the coating protection layer in the heat pipe area;

[0010] Cover the outermost layer of the entire detected part with a heat insulation layer;

[0011] According to the observation range of the infrared imager, confirm the position of the support frame and fix the infrared imager on the support frame;

[0012] The flexible heating plate is powered on for heating, and the temperature control point is lower than the maximum allowable temperature of the embedded heat pipe;

[0013] After the detected part reaches thermal equilibrium, uncover the heat insulation layer, observe and collect the surface temperature of the detected part;

[0014] Judge the embedding effect of the embedded heat pipe and determine the position where the heat pipe has poor contact with the surface of the embedded part.

[0015] Further, the step of judging the embedding effect of the embedded heat pipe and determining the position where the heat pipe has poor contact with the surface of the embedded part includes:

[0016] (1) According to the temperature data of the infrared thermal imager, extract the area of the embedded heat pipe, the temperatures A1, A2 at both ends of the embedded heat pipe and the temperature A3 in the middle section, as well as the temperatures B1, B2, B3, C1, C2, C3 in the area without heat pipes around;

[0017] (2) B is the designed temperature difference value in the heat pipe area of the embedded part: If |A1 - A2| < B, the embedded heat pipe has good contact with the surface of the embedded part and the embedding effect is good; if |A1 - A2| > B, the embedded heat pipe has poor contact with the embedded part and the embedding effect is poor, and the position with poor contact needs to be located;

[0018] (3) If |A1 - A3| > B, the position with poor contact is located between the middle section and the heating end; if |A2 - A3| > B, the position with poor contact is located between the unheated section and the middle section;

[0019] (4) C is the designed temperature difference value between the area of the embedded heat pipe and the area without the embedded heat pipe. If |B1 - A1|, |C1 - A1|, |B2 - A2|, |C2 - A2|, |B3 - A3|, |C3 - A3|, etc. are all less than C, the embedding effect of the embedded part is good. If there is a value greater than C, such as |B1 - A1| > C, the contact in the area without the embedded heat pipe between A1 and B1 is not good.

[0020] Furthermore, the non-destructive surface condition infrared detection method of the pre-embedded effect of the heat pipe obtains an evaluation of the pre-embedded effect of the heat pipe by collecting and processing the test data of the test piece, and can quickly locate unqualified areas; the temperature control and acquisition system is in direct contact with the surface of the test piece; the flexible coating protective layer utilizes electrostatic adsorption to evenly fit the test piece, ensuring that the measured temperature of the infrared imager is close to the actual temperature of the test piece and does not damage the surface condition of the test piece; by heating one end of the pre-embedded heat pipe, the surface temperature of the entire test piece is detected, and the pre-embedded effect of the embedded heat pipe is judged according to the pre-embedded effect criterion.

[0021] Another object of the present invention is to provide a non-destructive infrared detection system for the pre-embedded heat pipe effect, which implements the non-destructive infrared detection method for the pre-embedded heat pipe effect. The non-destructive infrared detection system for the pre-embedded heat pipe effect comprises:

[0022] Flexible heating plates;

[0023] The flexible heating plate is placed on the upper surface of the flexible coating protective layer and covers one end of the embedded heat pipe;

[0024] A temperature measuring element is fixed on the upper side of the flexible heating plate, and the temperature measuring element is connected to the temperature controller;

[0025] The upper side of the flexible coating protective layer is covered with a heat-insulating layer, an infrared thermal imager is arranged above the flexible coating protective layer, and the infrared thermal imager is fixed on the upper side of the support frame.

[0026] Furthermore, the flexible heating plate is a bendable heating sheet;

[0027] The flexible heating plate is a silicone rubber heating plate with a thickness of 2 mm and a black thermal control coating sprayed on the outer surface.

[0028] Furthermore, the flexible coating protective layer covers the surface of the inspected structural part, and the outer surface of the protective layer has a sprayed thermal control coating;

[0029] The temperature measuring element is a temperature measuring resistor or a thermocouple.

[0030] Furthermore, the thermal insulation layer is a 10-unit multi-layer thermal insulation component, and each unit of the thermal insulation component is composed of a layer of double-sided aluminum-plated film and a layer of polyester mesh.

[0031] Furthermore, the infrared thermal imager is connected to a data acquisition and processing system via a data cable;

[0032] The temperature measuring element and the flexible heating plate are integrated.

[0033] Another object of the present invention is to provide a method for enhancing the heat transfer capacity of a structural member, wherein the method for enhancing the heat transfer capacity of a structural member uses the non-destructive surface state infrared detection method of the heat pipe pre-embedded effect.

[0034] Another object of the present invention is to provide a method for improving the temperature uniformity of a structural component, wherein the method for improving the temperature uniformity of a structural component uses the non-destructive surface state infrared detection method of the heat pipe pre-embedded effect.

[0035] Combining all the above technical solutions, the advantages and positive effects of the present invention are as follows: the present invention does not cause damage to the test piece, can obtain the temperature distribution on the surface of the test piece in real time, intuitively judge the pre-embedding effect of the embedded heat pipe, and locate the area of the entire embedded piece with poor pre-embedding effect; the support frame has 6 degrees of freedom adjustment capability, which can achieve 3-dimensional translation and rotation, adjust the observation range of the infrared thermal imager, and the infrared thermal imager can perform real-time online measurement. The temperature control and acquisition system of the present invention does not come into direct contact with the surface of the test piece, and the entire testing process does not damage the surface condition of the test piece. Even personnel without pre-embedding experience can use the present invention to quickly, accurately, and safely judge the pre-embedding effect of the heat pipe.

[0036] Test Method Contact method Surface measurement point distribution number Judgment area residue Existing technology direct contact ≥4 Near the measuring point Residual glue This technical solution Indirect contact 0 Whole board none

[0037] The flexible heating plate in the present invention is a bendable heating plate. When the surface of the test piece is curved, the heating plate can also achieve good contact with the surface. The flexible heating plate in the present invention is a silicone rubber heating plate with a thickness of 2mm and a black thermal control coating sprayed on the outer surface with an emissivity greater than 0.85. The flexible coating protective layer in the present invention covers the surface of the structural part being tested. The outer surface of the protective layer is sprayed with a thermal control coating with an emissivity greater than 0.85. At the same time, the surface of the flexible coating protective layer is sprayed with black matte paint, which has a water-retention film with electrostatic adsorption function.

[0038] The temperature measuring element in the present invention is a temperature measuring resistor or a thermocouple. The insulation layer in the present invention is a 10-unit multi-layer insulation assembly, each unit of which is composed of a double-sided aluminum-coated film and a polyester mesh. This ensures the temperature control effect of the heating plate and allows the test piece to quickly enter a thermal equilibrium state. The infrared thermal imager in the present invention is connected to the data acquisition and processing system via a data cable, and the infrared thermal imager can perform real-time online measurements. The temperature measuring element in the present invention is integrated with the flexible heating plate to achieve temperature detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0040] Figure 1 2 is a schematic structural diagram of a non-destructive surface state infrared detection system for heat pipe pre-embedded effects provided by an embodiment of the present invention;

[0041] Figure 2 Schematic diagram of the structure of the thermal insulation layer provided by an embodiment of the present invention;

[0042] In the figure: 1. Flexible coating protective layer; 2. Flexible heating plate; 3. Temperature measuring element; 4. Temperature controller; 5. Infrared thermal imager; 6. Support frame; 7. Data acquisition and processing system; 8. Insulation layer.

[0043] Figure 3 This is a measured temperature cloud map provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0045] In view of the problems existing in the prior art, the present invention provides a non-destructive surface state infrared detection system and control method for the pre-embedded effect of heat pipes. The present invention is described in detail below with reference to the accompanying drawings. Specific embodiment one:

[0047] like Figure 1 and Figure 2 As shown, the non-destructive surface state infrared detection system for the heat pipe pre-embedded effect provided by the embodiment of the present invention is provided with a temperature control structure and a temperature measurement structure.

[0048] Temperature control structure: flexible coating protective layer 1, flexible heating plate 2, temperature measuring element 3, thermostat 4, thermal insulation layer 8.

[0049] Temperature measurement structure: infrared thermal imager 5, support frame 6, data acquisition and processing system 7.

[0050] The flexible heating plate 2 is placed on the upper surface of the flexible coating protective layer 1, covering one end of the embedded heat pipe; the flexible heating plate 2 is a bendable heating plate. When the surface of the test piece is curved, the heating plate can also achieve good contact with the surface. The flexible heating plate 2 is a silicone rubber heating plate with a thickness of 2mm. The outer surface is sprayed with a black thermal control coating with an emissivity greater than 0.85. The flexible coating protective layer 1 is a flexible electrostatic adsorption material that covers the surface of the structural part being tested. The outer surface of the protective layer is sprayed with a thermal control coating with an emissivity greater than 0.85. At the same time, black matte paint is sprayed on the surface of the flexible coating protective layer 1 to form a water-accumulating film with an electrostatic adsorption function.

[0051] A temperature measuring element 3 is fixed to the upper side of the flexible heating plate 2. This element is integral with the flexible heating plate 2 and connected to a thermostat 4, which, in conjunction with the thermostat, controls the temperature of the heating plate. The temperature measuring element 3 is a Pt100, and the thermostat is a PID (Proton-Inert Diode) thermostat. The upper side of the flexible coating protective layer 1 is covered with an insulation layer 8. This insulation layer 8 comprises a 10-unit multi-layer insulation assembly, each consisting of a double-sided aluminum film and a polyester mesh. This insulation layer 8 ensures the heating plate's temperature control, allowing the test specimen to quickly reach thermal equilibrium.

[0052] A FLIR ETS320 infrared thermal imager 5 is mounted on the upper side of the support frame 6. Positioned above the inspected structure, the support frame 6 features multi-dimensional adjustment, allowing for translation and rotation in each dimension, enabling the infrared thermal imager 5 to comprehensively observe the surface of the inspected component.

[0053] The infrared thermal imager 5 is connected to the data acquisition and processing system 7 via a data line. The data acquisition and processing system 7 can collect observation data in real time and process the data according to the pre-embedding effect judgment criteria to judge the pre-embedding effect. Among them, the data acquisition and processing system 7 is an industrial computer.

[0054] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0055] An embodiment of the present invention provides a non-destructive infrared detection method for the surface condition of a heat pipe pre-embedded effect, comprising the following steps:

[0056] Step a: Cover the surface of the test piece with a coating protective layer, ensuring that the protective layer is closely attached to the surface of the test piece under the action of electrostatic adsorption;

[0057] Step b: confirm the position of the embedded heat pipe and place the flexible heating plate on the coating protective layer in the heat pipe area;

[0058] Step c, covering the outermost layer of the entire test piece with an insulation layer;

[0059] Step d: confirm the position of the support frame according to the observation range of the infrared imager, and fix the infrared imager on the support frame;

[0060] Step e: The flexible heating plate is powered on for heating, and the temperature control point is lower than the maximum allowable temperature of the embedded heat pipe;

[0061] Step f: After the test piece reaches thermal equilibrium, the insulation layer is uncovered, and the surface temperature of the test piece is observed and collected;

[0062] Step g: Determine the pre-embedded effect of the embedded heat pipe and determine the position where the heat pipe has poor contact with the surface of the embedded component.

[0063] Step g of the above infrared detection method for the non-destructive surface state of the heat pipe embedding effect includes the following steps:

[0064] Step g1: According to the temperature data of the infrared thermal imager, extract the area of the embedded heat pipe, the temperatures A1 and A2 at both ends of the embedded heat pipe and the middle-section temperature A3, as well as the temperatures B1, B2, B3, C1, C2, and C3 in the area without the heat pipe around.

[0065] Step g2: B is the designed temperature difference value in the heat pipe area of the embedded part. If |A1 - A2| < B, the contact between the embedded heat pipe and the surface of the embedded part is good, and the embedding effect is good. If |A1 - A2| > B, the contact between the embedded heat pipe and the embedded part is poor, and the embedding effect is poor. It is necessary to locate the position with poor contact.

[0066] Step g3: If |A1 - A3| > B, the position with poor contact is located between the middle section and the heating end. If |A2 - A3| > B, the position with poor contact is located between the unheated section and the middle section.

[0067] Step g4: C is the designed temperature difference value between the area of the embedded heat pipe and the area without the embedded heat pipe. If |B1 - A1|, |C1 - A1|, |B2 - A2|, |C2 - A2|, |B3 - A3|, |C3 - A3|, etc. are all less than C, the embedding effect of the embedded part is good. If there is a value greater than C, such as |B1 - A1| > C, the contact in the area without the embedded heat pipe between A1 and B1 is not good. In this embodiment, the empirical values of B and C are selected, and B = C = 1°C. Specific Embodiment 2:

[0069] The difference between this embodiment and Embodiment 1 is that the infrared thermal imager 5 is handheld, and the model is FLIR E8 and does not require the support frame 6.

[0070] Step g of the above infrared detection method for the non-destructive surface state of the heat pipe embedding effect includes the following steps:

[0071] Step g1: According to the temperature data of the infrared thermal imager, extract the area of the embedded heat pipe, the temperature A12 at one end of the embedded heat pipe is 24.9°C, A2 is 24.7°C, and the middle-section temperature A3 is 24.8°C, as well as the temperatures B1 is 23.9°C, B2 is 24.3°C, B3 is 23.9°C, C1 is 23.8°C, C2 is 23.4°C, and C3 is 4°C in the area without the heat pipe around.

[0072] Step g2: B is the designed temperature difference value in the heat pipe area of the embedded part. If |A1 - A2| = 0.2°C < 1°C, the contact between the embedded heat pipe and the surface of the embedded part is good, and the embedding effect is good. Therefore, steps g3 and g4 are not required.

[0073] Figure 3 This is the measured temperature cloud map of this embodiment.

[0074] The working principle of the present invention is: by collecting and processing the test data of the test piece, an evaluation of the pre-embedded effect of the heat pipe is obtained, and unqualified areas can be quickly located. The temperature control and acquisition system of the present invention is in direct contact with the surface of the test piece. The entire testing process does not damage the surface state of the test piece, and the pre-embedded effect of the heat pipe can be judged quickly, accurately and safely. The flexible coating protective layer 1 utilizes electrostatic adsorption to evenly fit the test piece, ensuring that the measured temperature of the infrared imager 5 is close to the actual temperature of the test piece and does not damage the surface state of the test piece. By heating one end of the pre-embedded heat pipe, the surface temperature of the entire test piece is detected, and the pre-embedded effect of the embedded heat pipe is judged according to the pre-embedded effect criterion.

[0075] In the description of the present invention, unless otherwise specified, "plurality" means two or more; terms such as "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail" indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0076] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with this technical field within the technical scope disclosed by the present invention and within the spirit and principles of the present invention should be covered by the scope of protection of the present invention.

Claims

1. A non-destructive infrared detection method for the surface condition of heat pipe pre-embedded effect, characterized in that: The non-destructive surface state infrared detection method for the heat pipe embedding effect includes: Cover the surface of the detected component with a coating protection layer, ensuring that the protection layer is closely adhered to the surface of the detected component under the action of electrostatic adsorption; Confirm the position of the embedded heat pipe, and place the flexible heating plate on the coating protection layer in the heat pipe area; cover the outermost layer of the entire detected component with a thermal insulation layer; According to the observation range of the infrared imager, confirm the position of the support frame, and fix the infrared imager on the support frame; The flexible heating plate is powered on for heating, and the temperature control point is lower than the maximum allowable temperature of the embedded heat pipe; After the detected component reaches thermal equilibrium, uncover the thermal insulation layer, observe and collect the surface temperature of the detected component; Judge the embedding effect of the embedded heat pipe and determine the position where the heat pipe has poor contact with the surface of the embedded component; The step of judging the embedding effect of the embedded heat pipe and determining the position where the heat pipe has poor contact with the surface of the embedded component includes: (1) According to the temperature data of the infrared thermal imager, extract the area of the embedded heat pipe, the temperatures A1, A2 at both ends of the embedded heat pipe and the temperature A3 in the middle section, as well as the temperatures B1, B2, B3, C1, C2, C3 in the area without heat pipes around; (2) B is the designed temperature difference value in the heat pipe area of the embedded component: if |A1 - A2| < B, then the embedded heat pipe has good contact with the surface of the embedded component and the embedding effect is good; if |A1 - A2| > B, then the embedded heat pipe has poor contact with the embedded component and the embedding effect is poor, and the position with poor contact needs to be located; (3) If |A1 - A3| > B, then the position with poor contact is located between the middle section and the heating end; if |A2 - A3| > B, then the position with poor contact is located between the unheated section and the middle section; (4) C is the designed temperature difference value between the embedded heat pipe area and the non-embedded heat pipe area. If |B1 - A1|, |C1 - A1|, |B2 - A2|, |C2 - A2|, |B3 - A3|, |C3 - A3|, etc. are all less than C, then the embedding effect of the embedded component is good. If there is a value greater than C, such as B1 - A1 > C, then the contact in the non-embedded heat pipe area between A1 and B1 is not good; The non-destructive surface state infrared detection method for the heat pipe embedding effect obtains an evaluation of the heat pipe embedding effect by collecting and processing the test data of the tested component, and can quickly locate the unqualified area; the temperature control and acquisition system is in direct contact with the surface of the tested component; the flexible coating protection layer uses the electrostatic adsorption effect to be evenly adhered to the detected component, ensuring that the measured temperature of the infrared imager is close to the true temperature of the tested component and does not damage the surface state of the tested component; by heating one end of the embedded heat pipe, the surface temperature of the entire tested component is detected, and the embedding effect of the embedded heat pipe is judged according to the embedding effect criterion.

2. A non-destructive infrared detection system for the pre-embedded heat pipe effect implementing the non-destructive infrared detection method for the pre-embedded heat pipe effect according to claim 1, characterized in that: The non-destructive surface state infrared detection system for the heat pipe embedding effect is provided with: A flexible heating plate; The flexible heating plate is placed on the upper surface of the flexible coating protection layer and covers one end of the embedded heat pipe; A temperature measuring element is fixed on the upper side of the flexible heating plate, and the temperature measuring element is connected to the temperature controller; A thermal insulation layer is covered on the upper side of the flexible coating protection layer, and an infrared thermal imager is arranged above the flexible coating protection layer. The infrared thermal imager is fixed on the upper side of the support frame.

3. The non-destructive surface condition infrared detection system for heat pipe pre-embedded effect according to claim 2, characterized in that: The flexible heating plate is a flexible heating sheet; The flexible heating plate is a silicone rubber heating plate with a thickness of 2 mm, and a black thermal control coating is sprayed on the outer surface.

4. The non-destructive surface condition infrared detection system for heat pipe pre-embedded effect according to claim 2, characterized in that: The flexible coating protective layer covers the surface of the structure to be inspected, and the outer surface of the protective layer has a sprayed thermal control coating; The temperature measuring element is a temperature measuring resistor or a thermocouple.

5. The non-destructive surface condition infrared detection system for heat pipe pre-embedded effect according to claim 2, characterized in that: The thermal insulation layer is a 10-unit multi-layer thermal insulation component, and each unit of the thermal insulation component is composed of a layer of double-sided aluminum-plated film and a layer of polyester mesh.

6. The non-destructive surface condition infrared detection system for heat pipe pre-embedded effect according to claim 2, characterized in that: The infrared thermal imager is connected to the data acquisition and processing system via a data line; The temperature measuring element and the flexible heating plate are integrated.

7. A method for enhancing the heat transfer capacity of a structural member, characterized in that: The method for enhancing the heat transfer capacity of a structural component uses the non-destructive surface state infrared detection method for the heat pipe pre-embedded effect as described in claim 1.

8. A method for improving the temperature uniformity of a structural part, characterized in that: The method for improving the temperature uniformity of structural parts uses the non-destructive surface state infrared detection method of the heat pipe pre-embedded effect according to claim 1.

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