Temperature-controlled plume baffle structure

Abstract

The utility model relates to a temperature control type plume baffle structure belongs to plume baffle technical field. This temperature control type plume baffle structure, include: the baffle body of installation in the spacecraft surface, the heat abstract mechanism, the heat abstract mechanism includes the multiple grid grating of even opening in the baffle body surface, the inside of grid grating corresponds to be provided with the adjusting plate, the inside of baffle body is provided with the even heating layer, through setting up multiple grid grating at the surface of baffle body and setting up the baffle that can open and close at the surface of grid grating, make baffle can perceive temperature change and drive adjusting plate to open through the deformation of bimetallic strip when the engine works, carry out efficient radiation heat dissipation through the grid, and keep airtight under the non - working state to provide complete protection. Not only has improved the heat dissipation efficiency significantly, effectively avoided the problem that the backfire surface temperature exceeded the standard caused by heat accumulation.

Description

Technical Field

[0001] This utility model relates to the field of plume baffle technology, and in particular to a temperature-controlled plume baffle structure. Background Technology

[0002] Plume baffles are mechanical devices used to control the spread of the exhaust plume (feather) from engines or rockets, typically installed near the nozzle exit. Their core function is to regulate the impact of the plume on surrounding structures, protecting equipment and optimizing airflow distribution. To prevent material deformation or failure caused by high-temperature plumes and to ensure stable operation in extreme thermal environments, a temperature-controlled plume baffle structure is required. This design extends baffle life and prevents structural failures caused by thermal stress.

[0003] Traditional plume deflectors typically employ fixed thermal barriers, primarily consisting of multiple heavy solid baffles made of titanium alloys, high-temperature nickel-based alloys, or carbon composite materials installed between the engine nozzle and sensitive equipment. Their working principle is purely physical blocking and heat absorption—utilizing the material's high melting point and high heat capacity to absorb and temporarily store the thermal shock of the plume, and radiating heat into space through its large surface area. However, although this structure is simple and reliable, it is heavy and passively insulated. The heat accumulation may cause the temperature on the unexposed side to remain too high, which may cause the internal equipment to malfunction due to excessive heat. Utility Model Content

[0004] Therefore, it is necessary to provide a temperature-controlled plume baffle structure to address the problem that traditional plume baffles cannot actively dissipate heat.

[0005] A temperature-controlled plume baffle structure includes: a baffle body installed on the surface of a spacecraft; The heat dissipation mechanism includes multiple mesh grids evenly distributed on the surface of the baffle body, an adjustment plate correspondingly disposed inside the mesh grids, and a heat equalization layer disposed inside the baffle body.

[0006] In one embodiment, the surface of the adjusting plate is provided with a sealing block, and the inside of the grid is provided with a sealing groove corresponding to the sealing block. The sealing block is made of flexible graphite.

[0007] In one embodiment, the end of the adjusting plate away from the sealing block is hinged to the surface of the baffle body with two connecting blocks. The rotation angle of the two ends of the connecting blocks is no more than 90 degrees. Multiple guide grooves are provided on both sides of the adjusting plate.

[0008] In one embodiment, two bimetallic strips are fixedly connected between the lower surface of the adjusting plate and the inner wall of the baffle body. The bottom end of the bimetallic strip is disposed inside the mesh grid, and the two sides of the bimetallic strip have different metal expansion coefficients.

[0009] In one embodiment, a support rod is provided between the inner wall of the baffle body and the lower surface of the adjusting plate, the top end of the support rod is hinged to the lower surface of the adjusting plate, and the bottom end of the support rod is hinged to a slider.

[0010] In one embodiment, the slider is slidably connected to a groove inside the mesh grid that is formed in the inner wall of the baffle body, and the support rod is disposed between the two bimetallic strips and is arranged to cross the two bimetallic strips.

[0011] In one embodiment, a limiting rod is fixedly connected inside a groove formed inside the mesh grid, and the surface of the limiting rod passes through a slider, with the slider slidably connected to the surface of the limiting rod.

[0012] In one embodiment, a spring is sleeved on the surface of the limiting rod, and the spring is fixedly connected between the slider and the inner wall of the baffle body. Beneficial effects

[0013] By setting multiple mesh grilles on the surface of the baffle body and installing openable baffles on the surface of the mesh grilles, the baffle can sense temperature changes when the engine is running and open the adjustment plate through the deformation of the bimetallic strip, allowing for efficient radiative heat dissipation through the grilles. When not in operation, it remains sealed to provide complete protection. This not only significantly improves heat dissipation efficiency but also effectively avoids the problem of excessive back-fire surface temperature caused by heat accumulation. By installing support rods inside the mesh grid and driving them with springs, the device can quickly reset the adjusting plate after heat dissipation, effectively reducing the risk of contaminant intrusion due to reset delay or malfunction, and significantly improving the reliability and service life of the device. Furthermore, by setting a heat-equalizing layer inside the baffle body, the concentrated thermal shock experienced locally is quickly diffused to the entire baffle plane, which not only effectively prevents local overheating damage, but also promotes coordinated response and uniform heat dissipation of the large-area grid, improving the overall heat dissipation efficiency. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0015] Figure 1This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the overall structure of the present invention in its unfolded state; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the overall structure of the heat dissipation mechanism of this utility model; Figure 5 This is a schematic diagram of the internal structure of the mesh grid of this utility model.

[0016] Figure label: 100. Baffle body; 200. Heat dissipation mechanism; 210. Adjustment plate; 211. Sealing block; 212. Connecting block; 213. Flow guide channel; 220. Heat dissipation layer; 230. Bimetallic strip; 240. Support rod; 241. Limiting rod; 242. Slider; 243. Spring; 250. Mesh grid. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0018] The following is combined with Figure 1 - Figure 5 This invention describes the temperature-controlled plume baffle structure.

[0019] In one embodiment, a temperature-controlled plume baffle structure includes: a baffle body 100 installed on the surface of a spacecraft; The heat dissipation mechanism 200 includes a plurality of mesh grids 250 evenly distributed on the surface of the baffle body 100, an adjustment plate 210 is correspondingly provided inside the mesh grids 250, and a heat equalization layer 220 is provided inside the baffle body 100.

[0020] In this device, the baffle body 100 is made of titanium alloy, and its internal heat spreader 220 is filled with ammonia as the working fluid. At initial ambient temperature, the ammonia working fluid exists in liquid form within the heat spreader 220. When the baffle body 100 is impacted by an engine plume and its temperature rises rapidly, the liquid ammonia in the heat spreader 220 absorbs a large amount of heat and undergoes a phase change, rapidly vaporizing into ammonia vapor. Driven by the pressure difference, this vapor rapidly diffuses and fills the entire sealed cavity of the heat spreader 220, efficiently transferring locally concentrated heat to the entire baffle. This ensures that all the mesh grilles 250 on the back can start synchronously and uniformly and participate in heat dissipation, achieving coordinated thermal management from a "point" to a "surface".

[0021] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the surface of the adjusting plate 210 is provided with a sealing block 211, and the inside of the mesh grid 250 is provided with a sealing groove corresponding to the sealing block 211. The sealing block 211 is made of flexible graphite. Two connecting blocks 212 are hinged between the end of the adjusting plate 210 away from the sealing block 211 and the surface of the baffle body 100. The rotation angle of the two ends of the connecting blocks 212 is no more than 90 degrees. Multiple guide grooves 213 are provided on both sides of the adjusting plate 210. Two bimetallic strips 230 are fixedly connected between the lower surface of the adjusting plate 210 and the inner wall of the baffle body 100. The bottom end of the bimetallic strip 230 is located inside the mesh grid 250, and the two sides of the bimetallic strip 230 have different metal expansion coefficients.

[0022] In this embodiment, the bimetallic strip 230 is formed by high-temperature rolling of two metal alloys with different coefficients of thermal expansion. The active layer is a manganese-nickel-copper alloy, while the passive layer is an Invar nickel-iron alloy. When the ambient temperature rises, the active layer with a high coefficient of thermal expansion elongates significantly, while the passive layer with a low coefficient of thermal expansion elongates very little. Due to the stress difference within the strong bond between the two metal layers, the entire component is forced to bend towards the passive layer. This bending deformation is directly converted into angular displacement through a mechanical connection, i.e., the free end of the bimetallic strip 230 and the adjusting plate... The lower surface of 210 is connected. When the bimetallic strip 230 is heated and bent, the displacement generated at its free end pushes the adjusting plate 210 to rotate around the connecting block 212 to open. When the adjusting plate 210 and the baffle body 100 are in a horizontal state, the heat inside the mesh 250 will flow to the outside through the guide grooves 213 on both sides of the baffle. Since the adjusting plate 210 covers the surface of the mesh 250 and the heat is dissipated to the outside, it can block the impurities in the air outside the adjusting plate 210 and avoid affecting the closing of the adjusting plate 210. It should be noted that this device optimizes heat dissipation by setting a heat dissipation mechanism 200 on the surface of the baffle. Since the heat dissipation mechanism 200 is set on the surface and inside the baffle body 100, it will not affect the normal installation of the baffle, nor will it affect the material of the baffle body 100. The components in this device are all heat-resistant and have a certain degree of rigidity, so they will not affect the normal use of the baffle.

[0023] like Figure 3 , Figure 4 and Figure 5 As shown, a support rod 240 is provided between the inner wall of the baffle body 100 and the lower surface of the adjusting plate 210. The top end of the support rod 240 is hinged to the lower surface of the adjusting plate 210, and the bottom end of the support rod 240 is hinged to a slider 242. The slider 242 is slidably connected to a groove opened in the inner wall of the baffle body 100 inside the mesh grid 250. The support rod 240 is positioned between two bimetallic strips 230 and is arranged intersecting the two bimetallic strips 230. A limiting rod 241 is fixedly connected inside the groove opened inside the mesh grid 250. The surface of the limiting rod 241 passes through the slider 242, and the slider 242 is slidably connected to the surface of the limiting rod 241. A spring 243 is sleeved on the surface of the limiting rod 241, and the spring 243 is fixedly connected between the slider 242 and the inner wall of the baffle body 100.

[0024] In this embodiment, when the heat inside the baffle decreases, the bimetallic strip 230 slowly resets. Since the slider 242 was pulled by the support rod 240 to compress the spring 243 during the deformation process, the spring 243 releases its elastic force and pushes the slider 242 to reset. The slider 242 pulls the adjusting plate 210 to reset via the support rod 240 until the bimetallic strip 230 and the spring 243 push the slider 242 to reset. At this time, the adjusting plate 210 resets and completely covers the surface of the grid 250, and the sealing block 211 is inserted into the corresponding sealing groove to complete the reset.

[0025] Working principle: This device is installed on the surface of the part of the spacecraft that needs protection. When the spacecraft launches, its engine exhaust produces a high-temperature plume, causing the temperature near the engine to rise rapidly. At the same time, the temperature inside the baffle body 100 rises synchronously. The temperature rise inside the baffle body 100 causes the liquid ammonia inside the heat spreader 220 to vaporize rapidly, thereby causing the temperature of the entire baffle body 100 to rise rapidly and uniformly. When the temperature of the baffle body 100 rises, the bimetallic strip 230 is heated and begins to bend. Initially, the bending of the bimetallic strip 230 causes the adjusting plate 210 to rotate along the connecting block 212, with a rotation angle within ninety degrees. At this time, the plume airflow passes through the adjusting plate 210 and applies a thrust to it. A portion of the plume flows along the guide grooves 213 on both sides of the adjusting plate 210. This design helps the baffle to open stably under the action of the airflow and guides the airflow to reduce direct impact on the rotating mechanism. After the plume dissipates, the temperature of the baffle body 100 reaches its highest value. At this point, the thrust of the plume is lost, and heat inside the baffle body 100 begins to dissipate into the external space. Under the action of the support rod 240 and the bimetallic strip 230, the connecting block 212 rotates along the surface of the baffle body 100, while the adjusting plate 210, constrained by the bimetallic strip 230 and the adjusting rod, returns to a horizontal angle with the baffle surface. This increases the surface area for radiative heat dissipation, enabling efficient heat exchange through infrared radiation into space, thereby rapidly cooling the baffle body 100.

[0026] It should be noted that the spring 243, sealing block 211, bimetallic strip 230 and baffle body 100 mentioned above are all devices with relatively mature existing technology. The specific models can be selected according to actual needs, and will not be elaborated here.

[0027] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A temperature-controlled plume baffle structure, characterized in that, include: baffle body (100) installed on the surface of spacecraft. The heat dissipation mechanism (200) includes a plurality of mesh grids (250) evenly distributed on the surface of the baffle body (100), an adjustment plate (210) is correspondingly provided inside the mesh grids (250), and a heat dissipation layer (220) is provided inside the baffle body (100).

2. The temperature-controlled plume baffle structure according to claim 1, characterized in that, The surface of the adjustment plate (210) is provided with a sealing block (211), and the inside of the grid (250) is provided with a sealing groove corresponding to the sealing block (211). The material of the sealing block (211) is flexible graphite.

3. The temperature-controlled plume baffle structure according to claim 2, characterized in that, Two connecting blocks (212) are hinged between the end of the adjusting plate (210) away from the sealing block (211) and the surface of the baffle body (100). The two ends of the connecting blocks (212) rotate at an angle not greater than 90 degrees. Multiple guide grooves (213) are provided on both sides of the adjusting plate (210).

4. The temperature-controlled plume baffle structure according to claim 1, characterized in that, Two bimetallic strips (230) are fixedly connected between the lower surface of the adjusting plate (210) and the inner wall of the baffle body (100). The bottom end of the bimetallic strip (230) is located inside the mesh grid (250). The metal expansion coefficients on both sides of the bimetallic strip (230) are different.

5. The temperature-controlled plume baffle structure according to claim 4, characterized in that, A support rod (240) is provided between the inner wall of the baffle body (100) and the lower surface of the adjusting plate (210). The top end of the support rod (240) is hinged to the lower surface of the adjusting plate (210), and the bottom end of the support rod (240) is hinged to a slider (242).

6. The temperature-controlled plume baffle structure according to claim 5, characterized in that, The slider (242) is slidably connected to the groove inside the mesh (250) and opened in the inner wall of the baffle body (100). The support rod (240) is arranged between the two bimetallic strips (230) and is arranged to cross the two bimetallic strips (230).

7. The temperature-controlled plume baffle structure according to claim 1, characterized in that, A limiting rod (241) is fixedly connected inside the groove opened inside the mesh (250). The surface of the limiting rod (241) passes through the slider (242), and the slider (242) is slidably connected to the surface of the limiting rod (241).

8. The temperature-controlled plume baffle structure according to claim 7, characterized in that, A spring (243) is sleeved on the surface of the limiting rod (241), and the spring (243) is fixedly connected between the slider (242) and the inner wall of the baffle body (100).

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