Adjustable box structure for thermal insulation test research

Abstract

This application belongs to the field of aero-engine technology, and specifically relates to an adjustable box-type structure for heat insulation test research. The frame includes sidewalls and partitions. The partitions and the upper half of the sidewalls form an upward-opening upper mounting space, and the partitions and the lower half of the sidewalls form a downward-opening lower mounting space. A heating device is vertically movable and installed within the lower mounting space. A height-adjustable air-filled cavity is formed between the lower cover and the partition. An upper cover is vertically movable and installed within the upper mounting space. It and the partition form a height-adjustable heat insulation material filling cavity, which is filled with heat insulation material. The heat insulation material filling cavity is provided with multiple temperature measurement wiring holes of different heights for arranging test leads, enabling multiple combinations of the two parameters: air layer thickness and heat insulation material thickness. The thickness of each layer can be adjusted separately, and the range of test parameters can be steplessly adjusted according to test requirements.

Description

Technical Field

[0001] This application belongs to the field of aero-engine technology, and specifically relates to an adjustable box structure for heat insulation test research. Background Technology

[0002] To ensure the maintainability of gas turbines and the safety of operators, there is an urgent need for thermal protection of gas turbines. Common methods for reducing the surface temperature of the gas turbine to allow personnel to work in the turbine compartment include jet ventilation or thermal insulation. Thermal insulation is simple in structure and can achieve insulation by directly covering the hot-end components of the gas turbine. However, conventional insulation materials have high thermal conductivity. Due to the spatial constraints of the turbine compartment, it is essential to research and select highly efficient insulation materials, which are typically conducted experimentally.

[0003] Existing technological structures are generally fixed container structures of various forms. Different thicknesses and densities of insulation material can be achieved by fabricating and designing test specimens of various sizes. However, existing technological structures lack the capability to conduct experimental research on the optimal parameters for selecting the insulation material and air layer.

[0004] Existing technical solutions are limited by their non-adjustable structure, resulting in weak precision control during testing and a wide range of parameter selection. In terms of cost, selecting too many test parameters requires producing a large number of test pieces, leading to higher costs. Furthermore, the testing process occupies a significant amount of heating pipes, resulting in poor efficiency. Summary of the Invention

[0005] To address the aforementioned problems, this application provides an adjustable box-type structure for thermal insulation testing, comprising:

[0006] The frame includes sidewalls and partitions, wherein the partitions and the upper half of the sidewalls form an upward-opening upper mounting space, and the partitions and the lower half of the sidewalls form a downward-opening lower mounting space.

[0007] A heating device having a lower cover plate and a heat source for heating the lower cover plate; the heating device is vertically movable and installed in the lower installation space, and a height-adjustable air-filled cavity is formed between the lower cover plate and the partition plate;

[0008] The upper cover plate is vertically movable and installed in the upper mounting space. It forms a height-adjustable heat insulation material filling cavity with the partition plate. The heat insulation material filling cavity is filled with heat insulation material. Multiple temperature measurement wiring holes of different heights are provided on the heat insulation material filling cavity for arranging test leads.

[0009] Preferably, the heat source of the heating device includes a heating pipe through which a high-temperature airflow flows, and the wall of the heating pipe, except for the part near the lower cover plate, is covered with pipe insulation cotton; the lower cover plate has lower support plates on both sides, and the lower support plates are equipped with hoops to stably fix the pipe insulation cotton.

[0010] Preferably, the edge of the lower cover plate has lugs, which are hinged to the annular groove of the rolling bar by bearings, so that the lower cover plate forms a rolling pair with the opposite sidewalls.

[0011] Preferably, the side wall has a vertical limiting slide rail groove, the mounting seat moves vertically along the limiting slide rail groove and is locked in any position of the limiting slide rail groove by fasteners; the lower support plate has a limiting structure, the mounting seat overlaps with the limiting structure to restrict its vertical degree of freedom.

[0012] Preferably, the edge of the upper cover plate has lugs, which are hinged to the annular groove of the rolling bar by bearings, so that the upper cover plate forms a rolling pair with the opposite sidewalls.

[0013] Preferably, the upper surface of the cover plate has a level.

[0014] Preferably, the upper surface of the lower cover plate has an air cavity protective pad.

[0015] Preferably, the upper surface of the lower cover plate has an ear seat, and a loading device for opening the upper cover plate or pressing the heat insulation material is connected to the ear seat.

[0016] The advantages of this application include: The invention allows for the production of a small number of test specimens to conduct experimental studies on multiple groups of two parameters: "air layer thickness + insulation material thickness." The overall structure is simple and easy to assemble and disassemble, enabling stepless adjustment of both parameters as needed for the experiment. Furthermore, it allows for the filling of insulation material of the same thickness, enabling experimental studies on varying the density of the insulation material without disassembling the test specimens. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of an adjustable box structure according to a preferred embodiment of this application;

[0018] Figure 2 This is a partial schematic diagram of the limiting slide rail groove 12 according to a preferred embodiment of this application;

[0019] Figure 3 This is a cross-sectional view of the connection between the cover plate (15) and the rolling bar (8) in a preferred embodiment of this application. Detailed Implementation

[0020] To make the technical solution and advantages of this application clearer, the technical solution of this application will be described in a clearer and more complete manner below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some embodiments of this application, and are only used to explain this application, not to limit this application. It should be noted that, for ease of description, only the parts related to this application are shown in the accompanying drawings. Other related parts can be referred to the general design. In the absence of conflict, the embodiments and technical features in the embodiments of this application can be combined with each other to obtain new embodiments.

[0021] Furthermore, unless otherwise defined, the technical or scientific terms used in this application description shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "upper," "lower," "left," "right," "center," "vertical," "horizontal," "inner," and "outer," etc., used in this application description to indicate relative direction or positional relationship are used only to indicate relative orientation or positional relationship, and do not imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, and therefore should not be construed as a limitation on this application. The terms "first," "second," "third," and similar terms used in this application description are used only for descriptive purposes to distinguish different components, and should not be construed as indicating or implying relative importance. The terms "a," "one," or "the," etc., used in this application description should not be construed as an absolute limitation on quantity, but should be construed as indicating the existence of at least one. The terms "including," "comprising," etc., used in this application description mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects.

[0022] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, terms such as “installation,” “connection,” and “linkage” used in the description of this application should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can be a connection within two components. Those skilled in the art can understand its specific meaning in this application according to the specific circumstances.

[0023] To address the aforementioned issues, this application provides an adjustable box-type structure for thermal insulation testing, comprising: a heating pipe 1, a frame 2, an air-filled cavity 3, a thermal insulation material-filled cavity 4, a lower support plate 5, a hoop 6, an air cavity protective pad 7, a rolling rod 8, fasteners 9, a mounting base 10, a limiting structure 11, a limiting slide rail groove 12, an ear seat 13, a level 14, an upper cover plate 15, a lower cover plate 16, a temperature measurement wiring hole 17, pipe insulation cotton 18, a test wiring hole spacing L1, a thermal insulation material thickness L2, and an air layer thickness L3.

[0024] Frame 2 includes side walls and partitions, wherein the partitions and the upper half of the side walls form an upward-opening upper mounting space, and the partitions and the lower half of the side walls form a downward-opening lower mounting space.

[0025] Heating device 1 has a lower cover plate 16 and a heat source for heating the lower cover plate 16; heating device 1 is vertically movable and installed in the lower installation space, and a height-adjustable air-filled cavity 3 is formed between the lower cover plate 16 and the partition.

[0026] The upper cover plate 15 is vertically movable and installed in the upper installation space. It forms a height-adjustable heat insulation material filling cavity 4 with the partition plate. The heat insulation material filling cavity 4 is filled with heat insulation material. The heat insulation material filling cavity 4 is provided with multiple temperature measurement wiring holes 17 of different heights for arranging test leads. The heat source of the heating device 1 includes a heating pipe with a high-temperature airflow. The heating pipe is covered with pipe insulation cotton 18 except for the wall near the lower cover plate 16. The lower cover plate 16 has lower support plates 5 on both sides. The lower support plates 5 are equipped with hoops 6 to hold the pipe insulation cotton 18.

[0027] The lower cover plate 16 has lugs on its edge, which are hinged to the annular groove of the rolling rod 8 by bearings, so that the lower cover plate 16 forms a rolling pair with the opposite sidewalls. The upper cover plate 15 has lugs on its edge, which are hinged to the annular groove of the rolling rod 8 by bearings, so that the upper cover plate 15 forms a rolling pair with the opposite sidewalls.

[0028] The side wall has a vertical limiting slide rail groove 12. The mounting seat 10 moves vertically along the limiting slide rail groove 12 and is locked in any position of the limiting slide rail groove 12 by fasteners 9. The lower support plate 5 has a limiting structure 11. The mounting seat 10 overlaps with the limiting structure 11 to restrict its vertical freedom.

[0029] The upper surface of the upper cover plate 15 has a level 14, and the upper surface of the lower cover plate 16 has an air cavity protective pad 7. The upper surface of the lower cover plate 16 has an ear seat 13, and a loading device for opening the upper cover plate 15 or pressing the heat insulation material is connected to the ear seat 13.

[0030] During the experiment, a high-temperature airflow flows through the heating pipe 1, heating the lower cover plate 16 on the pipe. The inner side of the upper end of the frame 2 is marked with the thickness L2 of the insulation material filling cavity 4, and the outer side of the lower end is marked with the thickness L3 of the air filling cavity 3. The middle part of the frame 2 has a structure with good thermal conductivity, while the two ends have structures with poor thermal conductivity. This combination of materials improves the accuracy of the experiment.

[0031] Before the test, the insulation material filling cavity 4 can be opened through the ear seat 13 to complete the filling of the insulation material. Fill to the required thickness to the corresponding scale, and adjust the levelness using the level 14. By opening the fastener 9 and adjusting the thickness of the air filling cavity 3 according to the scale on the lower outer side of the frame 2, slide the fastener 9 and mounting base 10 into the limiting slide rail groove 12 to the corresponding scale value, and then lock them to fix them in the position of the limiting structure 11. When the air layer thickness study is cancelled, the scale position can be zeroed, and the lower rolling rod 8 and other structures can be protected by the air cavity protective pad 7. The temperature inside and at the top of the insulation material is monitored using temperature testing methods. Test leads are arranged through the temperature measurement wiring hole 17. During use, the temperature measurement point should be located in the middle of the structure as much as possible to minimize the influence of heat conduction and radiation. Figure 2 As shown, the rolling rod 8 is connected to the upper cover plate 15 and the lower cover plate 16 via bearings, which are high-temperature resistant rolling bearings. For the insulation material filling cavity 4, the density of the insulation material can be changed by filling it with the same thickness of insulation material and using the lug 13 to compress and adjust the thickness L2. This allows for experimental research on density parameter changes.

[0032] By adjusting the thicknesses of L2 and L3, stepless adjustment of the two types of parameters within a certain range can be achieved, significantly increasing the range of test parameters. The components of this structure are simple in design and easy to assemble and disassemble. Combined with a high-precision testing system, it can accurately obtain the combined thermal insulation performance of air and insulation materials during testing.

[0033] The advantages of this application include: the structure of this invention allows for the production of only a small number of test specimens throughout the entire thermal insulation test research process; the components are low-cost, easy to manufacture, process, and disassemble; it enables multiple combinations of two parameters—air layer thickness and thermal insulation material thickness—and allows for independent adjustment of the thickness of each layer; the range of test parameters can be steplessly adjusted according to the test requirements; it can fill with the same thickness of thermal insulation material, and experimental research on changing the density of the thermal insulation material can be carried out without disassembling the test specimens.

[0034] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An adjustable box structure for thermal insulation test research, characterized in that, include: The frame (2) includes a side wall and a partition, wherein the partition and the upper half of the side wall form an upward-opening upper mounting space, and the partition and the lower half of the side wall form a lower mounting space; The heating device (1) has a lower cover plate (16) and a heat source for heating the lower cover plate (16); the heating device (1) is vertically movable and installed in the lower installation space, and a height-adjustable air-filled cavity (3) is formed between the lower cover plate (16) and the partition. The upper cover plate (15) is vertically movable and installed in the upper installation space. It forms a height-adjustable heat insulation material filling cavity (4) with the partition plate. The heat insulation material filling cavity (4) is filled with heat insulation material. Multiple temperature measurement wiring holes (17) of different heights are provided on the heat insulation material filling cavity (4) for arranging test leads. The heat source of the heating device (1) includes a heating pipe through which a high-temperature airflow flows. The heating pipe is covered with pipe insulation cotton (18) except for the wall near the lower cover plate (16). The lower cover plate (16) has lower support plates (5) on both sides, and the lower support plates (5) are equipped with hoops (6) to hold the pipe insulation cotton (18). The edge of the lower cover plate (16) has lugs, which are hinged to the annular groove of the rolling bar (8) by bearings, so that the lower cover plate (16) forms a rolling pair with the opposite sidewalls; The side wall has a vertical limiting slide rail groove (12). The mounting seat (10) moves vertically along the limiting slide rail groove (12) and is locked in any position of the limiting slide rail groove (12) by fasteners (9). The lower support plate (5) has a limiting structure (11). The mounting seat (10) overlaps with the limiting structure (11) to restrict its vertical freedom. The edge of the upper cover plate (15) has a lug. The lug is hinged in the annular groove of the rolling bar (8) by a bearing, so that the upper cover plate (15) forms a rolling pair with the side wall.

2. The adjustable box structure for thermal insulation test study according to claim 1, characterized in that, The upper surface of the cover plate (15) has a level (14).

3. The adjustable box structure for thermal insulation test studies of claim 1, wherein, The upper surface of the lower cover plate (16) has an air cavity protective pad (7).

4. The adjustable box structure for thermal insulation test studies of claim 1, wherein, The upper surface of the lower cover plate (16) has an ear seat (13), and the ear seat (13) is connected to a loading device for opening the upper cover plate (15) or pressing the heat insulation material.

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