Automatic cooling of high temperature fixtures

Abstract

The application belongs to the technical field of force-thermal combined test, and particularly relates to an automatic cooling high-temperature clamp. The automatic cooling high-temperature clamp comprises a hollow cavity (11) formed in a clamp (1) and a liquid nitrogen storage tank (2) fixed on the clamp, the clamp (1) is provided with an inlet (12) and an outlet (13) communicating with the hollow cavity (11), an outlet end (21) of the liquid nitrogen storage tank (2) is connected with the inlet (12) of the clamp (1), and a one-way damping spring valve (3) is arranged at the inlet (12) in the hollow cavity (11) and at the outlet (13) outside the hollow cavity (11) respectively; the liquid discharge amount of the liquid nitrogen storage tank (2) to the hollow cavity (11) is adjusted through the internal and external pressure difference of the one-way damping spring valve (3) and the spring. The application adopts liquid nitrogen cooling, and there is no risk of electric leakage, the temperature of the clamp can be automatically controlled, and a cooling water pipeline is not needed.

Description

Technical Field

[0001] This application belongs to the field of combined mechanical and thermal testing technology, and specifically relates to an automatic cooling high-temperature fixture. Background Technology

[0002] Combined mechanical and thermal testing of aircraft components is crucial for flight safety. With the significant increase in the speed of modern aircraft, new materials, structures, and processes have been incorporated into the design of aircraft components. Traditional mechanical performance testing at room temperature is no longer sufficient to comprehensively assess the performance indicators of aircraft components; therefore, mechanical performance testing under high-temperature conditions is essential. High-temperature mechanical performance testing requires cooling of the test fixtures; otherwise, the test fixtures will fail before the test specimen.

[0003] Traditional test fixture cooling methods involve water cooling. A hollow cavity is machined into the test fixture, and cooling water flows through this cavity during the test to cool the fixture. This method has the following drawbacks:

[0004] 1. If the hollow cavity of the test fixture leaks water during heating, it will lead to serious consequences such as electric leakage.

[0005] 2. Some mechanical property tests require the test fixture to make large-amplitude reciprocating motions, which puts stringent requirements on the layout and sealing of cooling water pipelines. Summary of the Invention

[0006] To address the aforementioned issues, this application provides an automatic cooling high-temperature fixture to achieve automatic cooling and temperature control of the high-temperature fixture.

[0007] The automatic cooling high-temperature fixture provided in this application mainly includes a hollow cavity opened inside the fixture and a liquid nitrogen storage tank fixed on the fixture. The fixture has an inlet and an outlet communicating with the hollow cavity. The outlet end of the liquid nitrogen storage tank is connected to the inlet of the fixture. A one-way damping spring valve is provided at the inlet inside the hollow cavity and at the outlet outside the hollow cavity.

[0008] The one-way damping spring valve includes an outer tube, an inner tube, a sealing plate, a damping shaft, and a damping bushing. The outer tube has an air inlet that connects to the inlet or outlet of the clamp and an exhaust port that connects to the hollow cavity or the outside. The inner tube is installed inside the outer tube, with one end connected to the air inlet and the other end being an open end. The damping bushing is installed inside the outer tube and has a through hole in its center that is damped and connected to the damping shaft. The sealing plate is installed at the end of the damping shaft, and a compression spring is installed between the sealing plate and the damping bushing. The sealing plate is pressed by the spring at the open end of the inner tube.

[0009] Preferably, the outlet end of the liquid nitrogen storage tank is threadedly connected to the inlet of the clamp.

[0010] Preferably, the clamp is designed as an integral part of the liquid nitrogen storage tank.

[0011] Preferably, the outer tube of the one-way damping spring valve is welded onto the clamp.

[0012] Preferably, the damping shaft and damping bushing are made of rubber material.

[0013] Preferably, the spring is sleeved on the damping shaft.

[0014] This application uses liquid nitrogen cooling, which eliminates the risk of electric leakage, enables automatic temperature control, and eliminates the need for cooling water pipes, fundamentally solving the drawbacks of water-cooled fixtures. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the automatic cooling high-temperature fixture of this application.

[0016] Figure 2 This application Figure 1 A schematic diagram of the one-way damping spring valve structure of the embodiment shown.

[0017] Among them, 1-clamp, 11-hollow cavity, 12-inlet, 13-outlet, 2-liquid nitrogen storage tank, 21-outlet end, 22-inlet end, 3-one-way damping spring valve, 31-outer pipe, 311-air inlet, 312-exhaust port, 32-inner pipe, 33-sealing plate, 34-damping shaft, 35-damping bushing, 36-spring. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are only some, not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0019] This application provides an automatic cooling high-temperature fixture, such as... Figure 1 and Figure 2As shown, it mainly includes a hollow cavity 11 opened in the clamp 1 and a liquid nitrogen storage tank 2 fixed on the clamp. The clamp 1 has an inlet 12 and an outlet 13 communicating with the hollow cavity 11. The outlet end 21 of the liquid nitrogen storage tank 2 is connected to the inlet 12 of the clamp 1. A one-way damping spring valve 3 is respectively provided at the inlet 12 inside the hollow cavity 11 and at the outlet 13 outside the hollow cavity 11.

[0020] The one-way damping spring valve 3 includes an outer tube 31, an inner tube 32, a sealing plate 33, a damping shaft 34, and a damping bushing 35. The outer tube 31 has an air inlet 311 that connects to the inlet 12 or outlet 13 of the clamp 1 and an exhaust port 312 that connects to the hollow cavity 11 or the outside. The inner tube 32 is disposed inside the outer tube 31, with one end connected to the air inlet 311 and the other end being an open end. The damping bushing 35 is disposed inside the outer tube 31 and has a through hole in its center that is damped and connected to the damping shaft 34. The sealing plate 33 is disposed at the end of the damping shaft 34, and a compression spring 36 is disposed between the sealing plate 33 and the damping bushing 35. The sealing plate 33 is pressed by the spring 36 at the open end of the inner tube 32.

[0021] The hollow cavity 11 in this application is the main body of the test fixture 1 and is the object to be cooled. For example... Figure 1 As shown, there is an inlet on the left side, with a one-way damping spring valve 3 installed inside the inlet, through which liquid nitrogen flows in to cool the hollow cavity 11; there is an outlet at the bottom, with a one-way damping spring valve 3 also installed outside the outlet, through which high-temperature nitrogen flows out. The one-way spring damping valve 3 is the core component for completing the automatic cooling function, enabling the automatic inflow of liquid nitrogen into the hollow cavity and the automatic discharge of high-temperature nitrogen from the hollow cavity. Its components are as follows: Figure 2 As shown, in the initial state, under the combined force of the spring preload and the outer tube pressure P2, the sealing plate abuts against the right end face of the inner tube, isolating the inner tube cavity from the outer tube cavity. When the inner tube pressure P1 is greater than the combined force of the spring preload and the outer tube pressure P2, the sealing plate moves to the right, connecting the inner tube cavity with the outer tube cavity. The medium inside the inner tube cavity enters the outer tube cavity and then flows out from the outlet below the outer tube cavity. When the inner tube cavity is connected to the outer tube cavity, the inner tube pressure P1 decreases, and the sealing plate moves to the left. The damping of the damping shaft and damping sleeve slows down the movement speed of the sealing plate, allowing more medium to flow from the inner tube cavity into the outer tube cavity before the inner tube cavity and outer tube cavity are re-isolated by the sealing plate. When the pressure P1 in the inner tube cavity is less than the combined force of the spring preload and the pressure P2 in the outer tube cavity, the sealing plate moves to the left and presses against the right end face of the inner tube cavity, thus isolating the inner and outer tube cavities again. At this time, even if the pressure P2 in the outer tube cavity is greater than the pressure P1 in the inner tube cavity, the medium cannot flow back from the outer tube cavity to the inner tube cavity, achieving unidirectional flow of the medium.

[0022] The automatic temperature control process of the automatic cooling high-temperature fixture based on this application is as follows:

[0023] 1. Before starting the experiment, inject liquid nitrogen into the liquid nitrogen storage tank;

[0024] 2. After the experiment begins, as a small amount of liquid nitrogen in the liquid nitrogen storage tank vaporizes during the heating process, the pressure gradually increases;

[0025] 3. The inner cavity of the one-way damping spring valve 3 installed in the hollow cavity 11 is connected to the liquid nitrogen storage tank, and the pressure in its inner cavity also increases synchronously. When the pressure in the inner cavity is greater than the resultant force of the spring preload and the pressure in the outer cavity, the sealing plate moves to the right, the one-way damping spring valve 3 installed in the hollow cavity 11 opens, the inner cavity is connected to the outer cavity, and liquid nitrogen flows out from the outlet of the liquid nitrogen storage tank, enters the inner cavity of the one-way damping spring valve 3 installed in the hollow cavity 11, then enters the outer cavity, and flows out from the outlet below the outer cavity, entering the hollow cavity 11.

[0026] 4. The damping shaft and damping bushing reduce the movement speed of the sealing plate. Before the inner and outer tube cavities are re-isolated by the sealing plate, liquid nitrogen continues to flow into the hollow cavity 11. After some liquid nitrogen flows out, the pressure in the liquid nitrogen storage tank decreases, and the one-way damping spring valve 3 installed in the hollow cavity 11 closes.

[0027] 5. The liquid nitrogen flowing into the hollow cavity 11 rapidly vaporizes into low-temperature nitrogen gas. The vaporization process absorbs a large amount of heat, lowering the temperature of the hollow cavity 11, while simultaneously increasing the internal pressure. As the heating test continues, the nitrogen temperature gradually rises, and the pressure inside the hollow cavity 11 further increases. Due to the unidirectional flow characteristic of the one-way damping spring valve, the nitrogen gas will not flow back into the liquid nitrogen tank.

[0028] 6. The lower outlet of the hollow cavity 11 is connected to the inner cavity of the one-way damping spring valve 3 installed outside the hollow cavity 11. As the internal pressure of the hollow cavity 11 increases, the pressure in the inner cavity of the one-way damping spring valve 3 installed outside the hollow cavity 11 also gradually increases. When the pressure in the hollow cavity 11 is greater than the resultant force of the spring preload and the pressure in the outer cavity, the sealing plate moves, the one-way damping spring valve 3 installed outside the hollow cavity 11 opens, and the inner cavity is connected to the outer cavity. Nitrogen gas enters the outer cavity from the outlet of the hollow cavity 11 through the inner cavity of the one-way damping spring valve 3 installed outside the hollow cavity 11, and flows out from the outlet of the outer cavity into the atmosphere.

[0029] 7. The damping shaft and damping bushing reduce the movement speed of the sealing plate. Before the inner tube cavity and outer tube cavity are re-isolated by the sealing plate, nitrogen continues to be discharged from the hollow cavity, and the pressure in the hollow cavity 11 decreases.

[0030] 8. As the heating test proceeds, a small amount of liquid nitrogen inside the liquid nitrogen tank vaporizes again, the pressure rises again, and the liquid nitrogen flows back into the hollow cavity 11, starting a new cooling process and realizing continuous automatic cooling of the hollow cavity 11.

[0031] In this application, the internal volume of the hollow cavity 11 remains constant, therefore the internal pressure of the hollow cavity 11 is directly proportional to the temperature. By precisely adjusting the spring preload of the two one-way damping spring valves 3, the pressure fluctuation range and temperature fluctuation range of the hollow cavity 11 can be controlled, thereby achieving temperature control of the hollow cavity 11.

[0032] like Figure 1 As shown, the liquid nitrogen storage tank 2 of this application is fixed on the left side of the hollow cavity 11, with the top being the inlet end 22. Liquid nitrogen is injected from the inlet end 22 before the test begins. The right side is the outlet end 21. During heating, liquid nitrogen enters the hollow cavity 11 from the outlet end 21 to achieve cooling. In some optional embodiments, the outlet end 21 can be configured with an internal thread, or it can extend outwards with a nozzle having an external thread. The outlet end 21 of the corresponding liquid nitrogen storage tank 2 has a matching thread. The outlet end 21 of the liquid nitrogen storage tank 2 is threadedly connected to the inlet 12 of the clamp 1, thereby enabling the replacement of the liquid nitrogen storage tank 2. In alternative embodiments, the clamp 1 and the liquid nitrogen storage tank 2 can be welded together or designed as a single unit. In the integrated design embodiment, the entire clamp is configured with a hollow cavity 11 and a liquid nitrogen cavity for storing liquid nitrogen, with the hollow cavity 11 and the liquid nitrogen cavity communicating with each other.

[0033] The one-way damping spring valve 3 of this application is installed on the inner or outer wall of the hollow cavity 11 of the clamp. It can usually be connected by a detachable connection method, such as snap-fit ​​or threaded connection, or by a fixed connection method. For example, in some optional embodiments, the outer tube 31 of the one-way damping spring valve 3 is welded to the clamp 1.

[0034] Figure 2 In the one-way damping spring valve 3, an inner tube 32 and a damping bushing 35 are fixedly installed inside. The inner tube 32 and the damping bushing 35 can also be welded to the outer tube 31 to form an integral structure. In an alternative embodiment, the damping bushing 35 can be set as a detachable part, and the right side of the one-way damping spring valve 3 can also be set as a detachable sealing cover structure, so as to facilitate the installation of the damping bushing 35, the damping shaft 34 with sealing plate 33, and the spring 36.

[0035] In some alternative embodiments, the damping shaft 34 and the damping bushing 35 are made of rubber material to achieve a damping connection. In alternative embodiments, the damping shaft 34 and the damping bushing 35 can also be a structure in which metal material is covered with rubber material, thereby achieving both a damping connection and improving the connection strength of the components.

[0036] The spring 36 of this application is disposed between the sealing plate 33 and the damping bushing 35. Multiple springs 36 are distributed circumferentially around the damping shaft 34. The sealing plate 33 and the damping bushing 35 are provided with multiple protrusions to limit the extension and retraction direction of the spring 36. In an alternative embodiment, the spring can also be a single spring. When a single spring is used, in some optional embodiments, the spring 36 is sleeved on the damping shaft 34.

[0037] This application utilizes a simple mechanical structure to achieve automatic cooling and temperature control of high-temperature fixtures, featuring low cost, simple structure, and wide range of applications.

[0038] 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 automatic cooling high-temperature fixture, characterized in that, The device includes a hollow cavity (11) opened inside a clamp (1) and a liquid nitrogen tank (2) fixed on the clamp. The clamp (1) has an inlet (12) and an outlet (13) communicating with the hollow cavity (11). The outlet end (21) of the liquid nitrogen tank (2) is connected to the inlet (12) of the clamp (1). A one-way damping spring valve (3) is provided at the inlet (12) inside the hollow cavity (11) and at the outlet (13) outside the hollow cavity (11). The one-way damping spring valve (3) includes an outer tube (31), an inner tube (32), a sealing plate (33), a damping shaft (34), and a damping bushing (35). The outer tube (31) at the inlet (12) inside the hollow cavity (11) has an air inlet (311) communicating with the inlet (12) of the clamp (1) and an exhaust port (312) communicating with the hollow cavity (11). The outer tube (31) at the outlet (13) outside the hollow cavity (11) has an air inlet (311) communicating with the outlet (13) of the clamp (1) and an exhaust port (312) communicating with the outside. The exhaust port (312) is connected, the inner tube (32) is set inside the outer tube (31), one end of which is connected to the air inlet (311), and the other end is an open end. The damping bushing (35) is set inside the outer tube (31), and its center has a through hole for damping connection with the damping shaft (34). The sealing plate (33) is set at the end of the damping shaft (34), and a compression spring (36) is set between the sealing plate (33) and the damping bushing (35). The sealing plate (33) is pressed by the spring (36) at the open end of the inner tube (32). As the liquid nitrogen in the liquid nitrogen storage tank (2) vaporizes during the heating process, the pressure gradually increases. The liquid nitrogen enters the hollow cavity (11) through the one-way damping spring valve (3) at the inlet (12) inside the hollow cavity (11). The liquid nitrogen vaporizes and absorbs heat. At the same time, the pressure inside the hollow cavity (11) rises and is discharged outward through the one-way damping spring valve (3) at the outlet (13) outside the hollow cavity (11).

2. The automatic cooling high-temperature fixture as described in claim 1, characterized in that, The outlet end (21) of the liquid nitrogen storage tank (2) is threadedly connected to the inlet (12) of the clamp (1).

3. The automatic cooling high-temperature fixture as described in claim 1, characterized in that, The clamp (1) is integrated with the liquid nitrogen storage tank (2).

4. The automatic cooling high-temperature fixture as described in claim 1, characterized in that, The outer tube (31) of the one-way damping spring valve (3) is welded onto the clamp (1).

5. The automatic cooling high-temperature fixture as described in claim 1, characterized in that, The damping shaft (34) and damping bushing (35) are made of rubber material.

6. The automatic cooling high-temperature fixture as described in claim 1, characterized in that, The spring (36) is sleeved on the damping shaft (34).

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