High temperature baseline seal performance test apparatus

Abstract

This invention relates to the field of high-temperature performance testing technology for sealing materials, and discloses a high-temperature baseline sealing performance testing experimental device, including a base and a base plate fixedly installed on the top surface of the base. A fixed experimental body is fixedly installed on one side of the top surface of the base plate, and a sealing upper end cap is fixedly installed on the top surface of the fixed experimental body. Two sealing side end caps are symmetrically fixedly installed on the top surface of the base plate at the positions of the fixed experimental body and the sealing upper end cap. This invention further adjusts the pre-tightening force of the sealing material sample by adjusting the cylinder to drive the sliding experimental body. Combined with the introduction of high-temperature and high-pressure gas, it simulates the high-temperature, high-pressure, and frictional stress environment of the sealing material sample in actual service. At the same time, the experimental cylinder drives the friction plate to slide vertically back and forth, continuously applying frictional force through the friction convex bulge, replicating the actual working state of the sealing material sample. It can deeply test its high-temperature baseline sealing performance, providing highly reliable experimental support for sealing structure optimization, material selection, and life assessment.

Description

Technical Field

[0001] This invention relates to the field of high-temperature performance testing technology for sealing materials, and in particular to an experimental apparatus for high-temperature baseline sealing performance testing. Background Technology

[0002] Future hypersonic vehicles will require high-temperature resistant dynamic seals for their engines and connected moving parts (doors, rudders, flaps, etc.). The baseline seals currently used in the Space Shuttle landing gear doors, payload bay exhaust vents, and orbital spacecraft external storage tanks are no longer sufficient to meet the demands of future high-pressure and high-temperature environments. Reusing control surface seals that fail during high-speed flight can cause localized temperatures in areas such as the elevators to reach 1700°C, approaching the structural material's lifespan. Adopting novel high-temperature thermal sealing structures can not only meet sealing requirements but also significantly reduce launch costs. For example, long-life seals can be reused multiple times without replacement, thereby reducing spacecraft hardware, operational, and launch costs.

[0003] Currently, high-temperature baseline sealing material performance testing devices generally suffer from insufficient operating condition simulation and parameter control. Most can only conduct static tests under constant temperature and pressure, failing to reproduce the dynamic changes and complex boundary conditions of sealing materials under high-temperature conditions. This results in significant discrepancies between test data and actual service performance. The acquired material performance data, such as leakage rate, durability, and failure threshold, are limited and cannot comprehensively reflect the true material performance of sealing materials under extreme conditions. This hinders the provision of multi-dimensional, highly reliable support for sealing material formulation optimization, material selection, and material life assessment, thus limiting the accuracy and comprehensiveness of high-temperature baseline sealing material performance evaluation.

[0004] Therefore, it is necessary to design a high-temperature baseline sealing performance testing experimental device to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-temperature baseline sealing performance testing device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A high-temperature baseline sealing performance testing apparatus includes a base and a base plate fixedly installed on the top surface of the base. A fixed experimental body is fixedly installed on one side of the top surface of the base plate. A sealing upper end cap is fixedly installed on the top surface of the fixed experimental body. Two sealing side end caps are symmetrically fixedly installed on the top surface of the base plate at the positions of the fixed experimental body and the sealing upper end cap. An adjustment component is provided on the top surface of the base plate to adjust the pre-tightening force of the experimental sealing material sample in conjunction with the fixed experimental body, the sealing upper end cap, and the two sealing side end caps. An experimental component for driving the experiment is provided on the sealing upper end cap. The adjustment assembly includes a fixed seat fixedly installed on the top surface of the base, an adjustment cylinder fixedly installed on the side of the fixed seat, a sliding test body slidably installed on the top surface of the base plate, a flange for connecting to the telescopic end of the adjustment cylinder fixedly installed on the side of the sliding test body, and an installation assembly provided between the fixed test body, the sliding test body, and the two sealing end caps.

[0007] As a preferred embodiment of the present invention, the sliding experimental body is slidably connected to the sealed upper end cover and the two sealed side end covers through a sliding groove and a slider.

[0008] As a preferred embodiment of the present invention, sealing gaskets are installed between the fixed experimental body, the sliding experimental body and the base plate, between the fixed experimental body and the sealing upper end cover, and between the fixed experimental body and the two sealing side end covers.

[0009] As a preferred embodiment of the present invention, the mounting assembly includes two mounting ports opened on opposite sides of the fixed experimental body and the sliding experimental body. A mounting base is fixedly installed on the inner wall of the mounting port. The end of the mounting base is provided with a C-shaped opening adapted to the sealing material sample. Two side pressure screws corresponding to the C-shaped openings are symmetrically arranged through the sides of the two sealing end caps, and the side pressure screws are screwed to the sealing end caps.

[0010] As a preferred embodiment of the present invention, a sealing gasket is provided between the mounting base and the mounting port.

[0011] As a preferred embodiment of the present invention, the experimental assembly includes an experimental cylinder disposed on the top surface of the sealed upper end cover. The telescopic end of the experimental cylinder passes through the bottom surface of the sealed upper end cover and is provided with an adapter sleeve. The end of the adapter sleeve is provided with a friction plate. A slide is slidably installed on both inner walls of the friction plate. Several openings are provided on both sides of the friction plate. Several friction protrusions corresponding to the openings are fixedly installed on the sides of the slide. A support structure for adjusting the position of the slide is provided on the inner side of the friction plate.

[0012] As a preferred embodiment of the present invention, the support structure includes two adjusting screws symmetrically rotatably mounted on the inner bottom surface of the friction plate. The outer wall of the adjusting screws is threaded with a threaded sleeve. The outer wall of the threaded sleeve is symmetrically hinged with two adjusting plates, and the end of the adjusting plate away from the threaded sleeve is hinged to the side of the slide. The top ends of the two adjusting screws are connected by a driven wheel and a synchronous belt. The top surface of the sealing upper cover is provided with an operating structure adapted to one adjusting screw.

[0013] As a preferred embodiment of the present invention, the operating structure includes a connecting plate that penetrates the top surface of the friction plate, and the top end of an adjusting screw is fixedly connected to the connecting plate. A shaft is provided through a sealing bushing on the top surface of the sealing upper cover. A driving plate is fixedly installed at the bottom end of the shaft, and a driving bar is fixedly installed on the bottom surface of the driving plate.

[0014] As a preferred embodiment of the present invention, the drive disk is located directly above the connecting disk, and the top surface of the connecting disk has a slot adapted to the drive bar.

[0015] As a preferred embodiment of the present invention, air tubes are provided on the sides of both the fixed experimental body and the sealed upper cover, and a pressure sensor is provided on the inner wall of the fixed experimental body.

[0016] The present invention has the following beneficial effects: 1. This invention, through the cooperation of the sealing end cap, side pressure screw, mounting base, and C-shaped opening, allows operators to quickly install and remove sealing material samples. The operation process is simple and efficient. At the same time, by turning the side pressure screws at both ends, the clamping force at both ends of the material sample can be precisely adjusted to ensure that the installation position and initial clamping state of the sealing material sample meet the experimental requirements. This avoids the distortion of material performance test data caused by installation deviation, insufficient or excessive clamping force, and provides a reliable preliminary guarantee for subsequent sealing performance testing, thereby improving the accuracy of the test. 2. This invention drives the adjusting screws through an operating structure, and achieves synchronous rotation of the two adjusting screws with the help of the driven wheel and synchronous belt. With the transmission of the threaded sleeve, adjusting plate and slide, the size of the friction convex protruding through the opening can be precisely adjusted, thereby changing its contact area with the sealing material sample and flexibly controlling the material friction force during the test. In addition, the adjusting screws can be finely driven by rotating the shaft, further improving the accuracy of friction force adjustment. It can simulate different friction states of the sealing material sample under actual working conditions and enrich the dimensions of material performance test data. 3. This invention further adjusts the pre-tightening force of the sealing material sample by adjusting the cylinder-driven sliding experimental body. Combined with the introduction of high-temperature and high-pressure gas, it simulates the high-temperature, high-pressure, and frictional stress environment of the actual service of the sealing material sample. At the same time, the experimental cylinder drives the friction plate to slide vertically back and forth, and continuously applies frictional force through the friction convex bulge to reproduce the actual working state of the sealing material sample. It deeply tests the high-temperature baseline performance of the sealing material, providing highly reliable experimental support for sealing material formulation optimization, material selection, and material life assessment. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the high-temperature baseline sealing performance testing experimental device proposed in this invention; Figure 2This is an exploded structural diagram of the sealing side end cap of the high-temperature baseline sealing performance testing experimental device proposed in this invention; Figure 3 This is a front view schematic diagram of the high-temperature baseline sealing performance testing experimental device proposed in this invention; Figure 4 This is a schematic diagram of the sealing upper cover structure of the high-temperature baseline sealing performance testing experimental device proposed in this invention; Figure 5 This is a schematic diagram of the bottom structure of the sealing upper cover of the high-temperature baseline sealing performance testing experimental device proposed in this invention; Figure 6 This is a schematic diagram of a partial cross-sectional view of the friction plate of the high-temperature baseline sealing performance testing experimental device proposed in this invention; Figure 7 for Figure 5 Enlarged structural diagram at point A in the middle.

[0018] In the diagram: 1. Base; 2. Base plate; 3. Fixing the experimental subject; 4. Sealed side end cap; 5. Sealed top end cap; 6. Adjustment assembly; 61. Fixed base; 62. Adjustment cylinder; 63. Sliding experimental body; 64. Flange 1; 7. Mounting components; 71. Mounting port; 72. Mounting base; 73. C-shaped port; 74. Sealing gasket one; 75. Side pressure screw; 8. Sealing gasket two; 9. Experimental components; 91. Experimental cylinder; 92. Adapter sleeve; 93. Friction plate; 94. Slide; 95. Through port; 96. Friction protrusion; 97. Adjusting screw; 98. Threaded sleeve; 99. Adjusting plate; 10. Operating structure; 101. Connecting disc; 102. Shaft; 103. Drive disc; 104. Drive bar; 11. Trachea; 12. Pressure sensor. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Example 1: This is the high-temperature baseline sealing performance testing experimental apparatus disclosed in this example, referring to... Figure 1-7The apparatus includes a base 1 and a base plate 2 fixedly installed on the top surface of the base 1. A fixed experimental body 3 is fixedly installed on one side of the top surface of the base plate 2. A sealing upper end cover 5 is fixedly installed on the top surface of the fixed experimental body 3. Two sealing side end covers 4 are symmetrically fixedly installed on the top surface of the base plate 2 at the two ends of the fixed experimental body 3 and the sealing upper end cover 5. An adjustment component 6 is provided on the top surface of the base plate 2 to adjust the pre-tightening force of the experimental sealing material sample in conjunction with the fixed experimental body 3, the sealing upper end cover 5 and the two sealing side end covers 4. An experimental component 9 for driving the experiment is provided on the sealing upper end cover 5. Air tubes 11 are provided on the sides of both the fixed experimental body 3 and the sealing upper end cover 5. A pressure sensor 12 is provided on the inner wall of the fixed experimental body 3. The adjustment assembly 6 includes a fixed base 61 fixedly installed on the top surface of the base 1, an adjustment cylinder 62 fixedly installed on the side of the fixed base 61, a sliding test body 63 slidably installed on the top surface of the base plate 2, the sliding test body 63 is slidably connected to the sealing upper end cover 5 and the two sealing side end covers 4 through sliding grooves and sliders, a flange 64 for connecting to the telescopic end of the adjustment cylinder 62 is fixedly installed on the side of the sliding test body 63, a sealing gasket 8 is installed between the fixed test body 3, the sliding test body 63 and the base plate 2, between the fixed test body 3 and the sealing upper end cover 5, and between the fixed test body 3 and the two sealing side end covers 4, and an installation assembly 7 is provided between the fixed test body 3, the sliding test body 63 and the two sealing side end covers 4.

[0021] The implementation principle of this embodiment is as follows: During the high-temperature baseline sealing performance test, the staff first assembled the sealing material sample to be tested onto the opposite sides of the fixed test body 3 and the sliding test body 63 using a special mounting assembly 7. The clamping force applied to both ends of the sealing material sample was precisely adjusted using the mounting assembly 7 to ensure that the installation position and initial clamping state of the sealing material sample met the experimental requirements. After the installation and pre-clamping adjustment were completed, the adjusting cylinder 62 was activated to drive the sliding test body 63 to slide. The displacement and squeezing action of the sliding test body 63 reliably clamped the two sets of sealing material samples onto the overall experimental assembly 9, thus completing the further adjustment and setting of the pre-clamping force of the sealing material sample. Subsequently, combined with the preset test parameters... To meet the requirements of data acquisition, the relevant parameters of experimental component 9 are adjusted to enable the sealing material sample to generate and exhibit different experimental friction forces during relative movement, thus satisfying the testing requirements under multiple working conditions. After all the above parameters are adjusted, the staff connects the two experimental gas tubes 11 and introduces high-temperature and high-pressure gas into the sealed cavity between the fixed experimental body 3 and the sliding experimental body 63. Once all preparations are complete, experimental component 9 can be started to formally carry out the sealing performance test of the sealing material sample. During the experiment, the pressure sensor 12 on the inner wall of the fixed experimental body 3 can accurately monitor the gas pressure to understand the test parameters in a timely manner and facilitate accurate recording of the test results.

[0022] Example 2: Based on Example 1, this example discloses a high-temperature baseline sealing performance testing apparatus, such as... Figure 2 and Figure 3 As shown, the mounting assembly 7 includes two mounting ports 71 on opposite sides of the fixed experimental body 3 and the sliding experimental body 63. A mounting base 72 is fixedly mounted on the inner wall of the mounting port 71. The end of the mounting base 72 is provided with a C-shaped opening 73 that is adapted to the sealing material sample. A sealing gasket 74 is provided between the mounting base 72 and the mounting port 71. Two side pressure screws 75 corresponding to the C-shaped opening 73 are symmetrically arranged through the sides of the two sealing end caps 4, and the side pressure screws 75 are screwed to the sealing end caps 4.

[0023] The implementation principle of this embodiment is as follows: When assembling and installing the sealing material sample to be tested, the staff first removes the two side pressure screws 75 on one side of the sealing end cap 4 to leave assembly space for the sealing material sample. Then, the sealing material sample is smoothly inserted into the C-shaped opening 73 on the mounting base 72 from the installation position corresponding to the side pressure screws 75, completing the initial positioning of the sealing material sample. After the sealing material sample is in place, the previously removed side pressure screws 75 are reinstalled. Then, according to the experimental preset requirements, the two side pressure screws 75 at both ends are tightened and adjusted. By controlling the tightening degree of the side pressure screws 75, the clamping force on both ends of the sealing material sample is gradually adjusted so that the clamping force accurately meets the relevant requirements of the sealing performance test, thereby completing the reliable installation of the sealing material sample.

[0024] Example 3: Based on Example 1, this example discloses a high-temperature baseline sealing performance testing apparatus, such as... Figure 4-6 As shown, the experimental assembly 9 includes an experimental cylinder 91 disposed on the top surface of the sealed upper end cover 5. The telescopic end of the experimental cylinder 91 passes through the bottom surface of the sealed upper end cover 5 and is provided with an adapter sleeve 92. The end of the adapter sleeve 92 is provided with a friction plate 93. Sliders 94 are slidably installed on both inner walls of the friction plate 93. Several openings 95 are opened on both sides of the friction plate 93. Several friction protrusions 96 corresponding to the openings 95 are fixedly installed on the sides of the sliders 94. A support structure for adjusting the position of the sliders 94 is provided on the inner side of the friction plate 93. The support structure includes two adjusting screws 97 symmetrically rotatably mounted on the inner bottom surface of the friction plate 93. The outer wall of the adjusting screw 97 is threaded with a threaded sleeve 98. The outer wall of the threaded sleeve 98 is symmetrically hinged with two adjusting plates 99. The end of the adjusting plate 99 away from the threaded sleeve 98 is hinged to the side of the slide 94. The top ends of the two adjusting screws 97 are connected by a driven wheel and a synchronous belt. The top surface of the sealing upper cover 5 is provided with an operating structure 10 adapted to one adjusting screw 97.

[0025] The implementation principle of this embodiment is as follows: After the sealing material sample is installed, the operator first drives one of the adjusting screws 97 through the operating structure 10. When this adjusting screw 97 rotates, it drives the other adjusting screw 97 to rotate synchronously through the transmission cooperation between the driven wheel and the synchronous belt, thus achieving synchronous rotation of the two adjusting screws 97. Since the threaded sleeve 98 is threadedly connected to the adjusting screw 97, and the threaded sleeve 98 is hinged to the slide 94 through the adjusting plate 99, the threaded sleeve 98 can slide along the axial direction of the adjusting screw 97 during the rotation of the adjusting screw 97. This, in turn, drives the slide 94 to produce a corresponding displacement through the transmission of the adjusting plate 99, thereby adjusting the sliding... The size of the friction protrusion 96 extending from the opening 95 on the side of the frame 94 is precisely adjusted to change the actual contact area of ​​the friction protrusion 96 during the sealing material sample test, thus achieving flexible control over the magnitude of the friction force experienced by the sealing material sample during the test. After all parameters are adjusted, the staff starts the experimental cylinder 91, driving the friction plate 93 to make a stable reciprocating sliding motion in the vertical direction. During the motion, the friction protrusion 96 on the friction plate 93 continuously contacts the sealing material sample and applies friction force, thereby simulating the friction force state of the sealing material sample under actual working conditions, so as to conduct a more in-depth and realistic test experiment on the high-temperature baseline sealing performance.

[0026] Example 4: Based on Example 1, this example discloses a high-temperature baseline sealing performance testing apparatus, such as... Figure 5-7 As shown, the operating structure 10 includes a connecting plate 101 that runs through the top surface of the friction plate 93, and the top end of an adjusting screw 97 is fixedly connected to the connecting plate 101. A shaft 102 is provided through the top surface of the sealing upper cover 5 via a sealing bushing. A drive plate 103 is fixedly installed at the bottom end of the shaft 102. A drive bar 104 is fixedly installed on the bottom surface of the drive plate 103. The drive plate 103 is located directly above the connecting plate 101. A slot adapted to the drive bar 104 is provided on the top surface of the connecting plate 101.

[0027] The implementation principle of this embodiment is as follows: When finely adjusting the friction force of the friction plate 93, the operator can rotate the operating part at the top of the shaft 102, thereby driving the drive plate 103 and the drive bar 104 to rotate synchronously. In the initial state, the experimental cylinder 91 is in a contracted and shortened state. At this time, the drive bar 104 is just fitted into the slot on the top surface of the connecting plate 101. Therefore, when the shaft 102 rotates, it can smoothly drive the connecting plate 101 to rotate synchronously, and further drive the adjusting screw 97 connected to it to rotate, thus successfully completing the driving operation of the adjusting screw 97 and providing a power transmission basis for the subsequent adjustment of the friction force. Since the adjusting screw 97, the slide 94 and the friction protrusion 96 are all inside the cavity and cannot be observed, the operator can set a scale line corresponding to the shaft 102 on the sealed upper cover 5, so as to accurately know the adjustment status of the friction protrusion 96.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-temperature baseline sealing performance testing apparatus, characterized in that, The device includes a base (1) and a base plate (2) fixedly installed on the top surface of the base (1). A fixed experimental body (3) is fixedly installed on one side of the top surface of the base plate (2). A sealing upper end cap (5) is fixedly installed on the top surface of the fixed experimental body (3). Two sealing side end caps (4) are symmetrically fixedly installed on the top surface of the base plate (2) at the two ends of the fixed experimental body (3) and the sealing upper end cap (5). An adjustment component (6) is provided on the top surface of the base plate (2) to adjust the pre-tightening force of the experimental sealing material sample in cooperation with the fixed experimental body (3), the sealing upper end cap (5) and the two sealing side end caps (4). An experimental component (9) for driving the experiment is provided on the sealing upper end cap (5). The adjustment component (6) includes a fixed seat (61) fixedly installed on the top surface of the base (1), an adjustment cylinder (62) fixedly installed on the side of the fixed seat (61), a sliding test body (63) slidably installed on the top surface of the base plate (2), a flange (64) for connecting to the telescopic end of the adjustment cylinder (62) fixedly installed on the side of the sliding test body (63), and an installation component (7) is provided between the fixed test body (3), the sliding test body (63) and the two sealing end caps (4).

2. The high-temperature baseline sealing performance testing apparatus according to claim 1, characterized in that, The sliding experimental body (63) is slidably connected to the sealed upper end cap (5) and the two sealed side end caps (4) through a sliding groove and a slider.

3. The high-temperature baseline sealing performance testing apparatus according to claim 1, characterized in that, Sealing gaskets (8) are installed between the fixed experimental body (3), the sliding experimental body (63) and the base plate (2), between the fixed experimental body (63) and the sealing upper end cover (5), and between the fixed experimental body (63) and the two sealing side end covers (4).

4. The high-temperature baseline sealing performance testing apparatus according to claim 1, characterized in that, The mounting assembly (7) includes two mounting ports (71) on opposite sides of the fixed test body (3) and the sliding test body (63). The inner wall of the mounting port (71) is fixedly mounted with a mounting base (72). The end of the mounting base (72) is provided with a C-shaped opening (73) adapted to the sealing material sample. The two sealing end caps (4) are symmetrically provided with two side pressure screws (75) corresponding to the C-shaped opening (73) on their sides, and the side pressure screws (75) are screwed to the sealing end caps (4).

5. The high-temperature baseline sealing performance testing apparatus according to claim 4, characterized in that, A sealing gasket (74) is provided between the mounting base (72) and the mounting port (71).

6. The high-temperature baseline sealing performance testing apparatus according to claim 1, characterized in that, The experimental assembly (9) includes an experimental cylinder (91) disposed on the top surface of the sealed upper cover (5). The telescopic end of the experimental cylinder (91) passes through the bottom surface of the sealed upper cover (5) and is provided with an adapter sleeve (92). The end of the adapter sleeve (92) is provided with a friction plate (93). A slide (94) is slidably installed on both sides of the inner wall of the friction plate (93). Several openings (95) are opened on both sides of the friction plate (93). Several friction protrusions (96) corresponding to the openings (95) are fixedly installed on the side of the slide (94). A support structure for adjusting the position of the slide (94) is provided on the inner side of the friction plate (93).

7. The high-temperature baseline sealing performance testing apparatus according to claim 6, characterized in that, The support structure includes two adjusting screws (97) symmetrically rotatably mounted on the inner bottom surface of the friction plate (93). The outer wall of the adjusting screw (97) is threaded with a threaded sleeve (98). The outer wall of the threaded sleeve (98) is symmetrically hinged with two adjusting plates (99). The end of the adjusting plate (99) away from the threaded sleeve (98) is hinged to the side of the slide (94). The top ends of the two adjusting screws (97) are connected by a driven wheel and a synchronous belt. The top surface of the sealing upper cover (5) is provided with an operating structure (10) adapted to one adjusting screw (97).

8. The high-temperature baseline sealing performance testing apparatus according to claim 7, characterized in that, The operating structure (10) includes a connecting plate (101) that passes through the top surface of the friction plate (93), and the top end of an adjusting screw (97) is fixedly connected to the connecting plate (101). The top surface of the sealing upper cover (5) is provided with a shaft (102) through a sealing bushing. The bottom end of the shaft (102) is fixedly installed with a drive plate (103), and the bottom surface of the drive plate (103) is fixedly installed with a drive bar (104).

9. The high-temperature baseline sealing performance testing apparatus according to claim 8, characterized in that, The drive disk (103) is located directly above the connecting disk (101), and the top surface of the connecting disk (101) has a slot that is adapted to the drive bar (104).

10. The high-temperature baseline sealing performance testing apparatus according to claim 1, characterized in that, Both the fixed experimental body (3) and the sealed upper end cap (5) are provided with air tubes (11), and the inner wall of the fixed experimental body (3) is provided with pressure sensors (12).

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