A cooling molding apparatus for carbon-carbon composite materials
By using multi-stage cooling and inert gas pressure compensation technology in the cooling molding device, the problem of inaccurate temperature control during the cooling process of carbon-carbon composite materials was solved, achieving uniform distribution of internal stress and improving the density and strength of the material.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO HUAYUXIANG NEW ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-06-04
- Publication Date
- 2026-05-26
AI Technical Summary
In the existing technology, the cooling temperature of carbon-carbon composite materials is difficult to control precisely, which leads to stress concentration and affects the material properties.
A cooling forming device is adopted, which combines a cold water tank, a water storage tank and a gas storage cylinder to achieve multi-stage cooling and dynamic flow regulation. Combined with inert gas pressure compensation technology, it ensures that the temperature gradient during the cooling process is gradually reduced and the material shrinkage stress is reduced.
This method achieves a gradual reduction in the temperature gradient during the cooling process of carbon-carbon composite materials, avoiding stress concentration and improving the density and strength of the materials.
Smart Images
Figure CN224275846U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of composite material manufacturing technology, specifically to a cooling and molding device for carbon-carbon composite materials. Background Technology
[0002] Carbon-carbon composites are carbon matrix composites reinforced with carbon fibers and their fabrics, possessing excellent properties such as low density, high strength, high temperature resistance, corrosion resistance, and electrical and thermal conductivity.
[0003] In the molding process of carbon-carbon composite materials, the preform needs to be treated by impregnation, curing and carbonization and then cooled. A reasonable cooling molding process can make the stress distribution inside the material uniform, reduce the generation of cracks and defects, and improve the density and strength of the material. Therefore, cooling molding is an important step in the preparation process of carbon-carbon composite materials and directly affects the mechanical properties of the material.
[0004] Current carbon-carbon composite material cooling structures generally follow the structure described in patent application CN202122517489.8, which discloses a novel carbon-carbon composite material cooling structure. This structure includes a shell with an air inlet at the bottom, connected to an inner shell. An exhaust valve is installed at the top of the shell. A cooling water pipe connects the shell and the inner shell, with an inlet and outlet pipe. A water pump is installed on the inlet pipe. An air pipe connects to the air inlet, which in turn connects to an inert gas tank. A valve and pressure gauge are installed on the air pipe. This invention increases air density by introducing inert gas and pressurizing it before cooling with cold water. This increases the air density and allows for greater contact between the inert gas molecules and the cold water, effectively improving cooling efficiency. Furthermore, it eliminates the need for continuous inert gas supply, reducing production costs. However, different cooling stages of carbon-carbon composite materials require different temperatures. This invention struggles to precisely control the cooling temperature, potentially leading to stress concentration within the composite material and affecting its performance.
[0005] Therefore, this invention proposes a cooling and molding device for carbon-carbon composite materials to solve the above-mentioned problems. Utility Model Content
[0006] The purpose of this invention is to provide a cooling and molding device for carbon-carbon composite materials, which solves the problem in the prior art that the cooling temperature is difficult to control precisely, and that stress concentration easily occurs inside the carbon-carbon composite material.
[0007] The technical solution adopted by this utility model to solve its technical problem is:
[0008] A cooling molding device for carbon-carbon composite materials includes a cooling cylinder with a cover connected to the top. The top of the cover is connected to a gas storage cylinder via a gas supply pipe. A pressure sensor, a pressure relief valve, and a temperature sensor are also connected to the cover.
[0009] The cooling cylinder is fixedly connected to an inlet pipe and an outlet pipe. The inlet pipe is connected to a cold water tank via an inlet pump, and the outlet pipe is connected to a first water storage tank via an outlet pump. Both the cold water tank and the first water storage tank are located inside the machine body. A second water storage tank is also located inside the machine body. A main control device is connected to the side wall of the machine body.
[0010] The first water tank has a first water pipe connected to its outlet, which is connected to the inlet pipe via a three-way valve a, and a first water pump is connected to the first water pipe. The second water tank has a second water pipe connected to its inlet, which is connected to the outlet pipe via a three-way valve b, and a second water pump is connected to the second water pipe. The first water tank and the second water tank are connected to each other via a third water pipe, which is connected to a third water pump.
[0011] The main control device is electrically connected to the pressure sensor, pressure relief valve, temperature sensor, inlet pump, outlet pump, first pump, second pump, and third pump.
[0012] Furthermore, the cooling cylinder comprises, from the outside to the inside, a protective shell, an insulation layer, a cooling layer, and an inner liner. The cooling layer is provided with a spiral cooling channel, and the cooling layer is connected to the water inlet pipe and the water outlet pipe.
[0013] Furthermore, the gas storage cylinder contains an inert gas, specifically nitrogen.
[0014] Furthermore, the cold water tank includes a tank body, a condenser is connected to the bottom of the tank body, and a temperature control switch is provided inside the tank body, which is electrically connected to the condenser.
[0015] Furthermore, a pressure balancing pipe is provided between the inlet pipe and the outlet pipe, and a safety overflow valve is provided on the pressure balancing pipe.
[0016] Furthermore, a one-way valve is connected to the water inlet pipe, and the one-way valve is located between the three-way valve a and the cold water tank.
[0017] Furthermore, a booster pump and a pressure switch are also connected to the water inlet pipe, and both the booster pump and the pressure switch are electrically connected to the main control device.
[0018] In summary, compared with the prior art, the beneficial effects of this utility model are as follows:
[0019] 1. This utility model controls the cooling water temperature by mutually adjusting the cold water tank, the first water storage tank and the second water storage tank, thereby dividing the cooling process into multiple stages. Furthermore, the flow rate of the cooling water in the spiral cooling channel is dynamically adjusted by the pressurization pump, so that the temperature difference gradient of the carbon-carbon composite material gradually decreases during the cooling process, thus avoiding stress concentration during the cooling process.
[0020] This invention uses inert gas pressure compensation technology to continuously inject nitrogen from a gas storage cylinder to maintain a constant gas pressure inside the cooling cylinder. When the internal pressure fluctuates due to material shrinkage during cooling, the main control device automatically adjusts the amount of nitrogen injected or makes fine adjustments through a pressure relief valve. This, combined with the slow cooling process, reduces the shrinkage stress of the material. Attached Figure Description
[0021] Figure 1 This is a three-dimensional illustration of the present invention. Figure 1 ;
[0022] Figure 2 This is a three-dimensional illustration of the present invention. Figure 2 ;
[0023] Figure 3 This is a partial cross-sectional view of the main view of this utility model;
[0024] Figure 4 This is a partial cross-sectional schematic diagram of the top view of this utility model;
[0025] In the diagram: 1. Cooling cylinder; 2. Protective shell; 3. Insulation layer; 4. Cooling layer; 5. Inner liner; 6. Spiral cooling channel; 7. Cover; 8. Gas supply pipe; 9. Gas cylinder; 10. Pressure sensor; 11. Pressure relief valve; 12. Temperature sensor; 13. Water inlet pipe; 14. Water outlet pipe; 15. Water inlet pump; 16. Housing; 17. Condenser; 18. Temperature control switch; 19. Water outlet pump; 20. First water storage tank; 21. Pressure balance pipe; 22. Safety overflow valve; 23. Check valve; 24. Three-way valve a; 25. Booster pump; 26. Pressure switch; 27. Second water storage tank; 28. First water pipe; 29. First water pump; 30. Second water pipe; 31. Second water pump; 32. Third water pipe; 33. Third water pump; 34. Machine body; 35. Main control device; 36. Three-way valve b. Detailed Implementation
[0026] 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. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0027] In this application, the terms "upper," "inner," "outer," "middle," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0028] like Figure 1-4 As shown, a cooling molding device for carbon-carbon composite materials includes a cooling cylinder 1, with a cover 7 connected to the top of the cooling cylinder 1. The top of the cover 7 is connected to a gas storage cylinder 9 via a gas supply pipe 8. The gas storage cylinder 9 contains an inert gas, namely nitrogen. A pressure sensor 10, a pressure relief valve 11, and a temperature sensor 12 are also connected to the cover 7.
[0029] Furthermore, an inlet pipe 13 and an outlet pipe 14 are fixedly connected to the outer side of the cooling cylinder 1. The inlet pipe 13 is connected to the cold water tank via an inlet pump 15, and the outlet pipe 14 is connected to the first water storage tank 20 via an outlet pump 19. Both the cold water tank and the first water storage tank 20 are located inside the body 34. The cold water tank includes a housing 16, and a condenser 17 is connected to the bottom of the housing 16. A temperature control switch 18 is installed inside the housing 16, and the temperature control switch 18 is electrically connected to the condenser 17. The cooling cylinder 1 includes, from the outside to the inside, a protective shell 2, an insulation layer 3, a cooling layer 4, and an inner liner 5. A spiral cooling channel 6 is provided inside the cooling layer 4, and the cooling layer 4 is connected to the inlet pipe 13 and the outlet pipe 14. A pressure balancing pipe 21 is provided between the inlet pipe 13 and the outlet pipe 14, and a safety overflow valve 22 is provided on the pressure balancing pipe 21. A one-way valve 23 is connected to the water inlet pipe 13, and the one-way valve 23 is located between the three-way valve a24 and the cold water tank. A booster pump 25 and a pressure switch 26 are also connected to the water inlet pipe 13, and both the booster pump 25 and the pressure switch 26 are electrically connected to the main control device 35.
[0030] Furthermore, a second water storage tank 27 is also provided inside the body 34, and a main control device 35 is connected to the side wall of the body 34; a first water pipe 28 is connected to the outlet of the first water storage tank 20, and the first water pipe 28 is connected to the inlet pipe 13 through a three-way valve a24, and a first water pump 29 is connected to the first water pipe 28; a second water pipe 30 is connected to the inlet of the second water storage tank 27, and the second water pipe 30 is connected to the outlet pipe 14 through a three-way valve b36, and a second water pump 31 is connected to the second water pipe 30; the first water storage tank 20 and the second water storage tank 27 are connected through a third water pipe 32, and a third water pump 33 is connected to the third water pipe 32;
[0031] Furthermore, the main control device 35 is electrically connected to the pressure sensor 10, the pressure relief valve 11, the temperature sensor 12, the inlet pump 15, the outlet pump 19, the first pump 29, the second pump 31, and the third pump 33.
[0032] The working process of this utility model is as follows:
[0033] First, the main control unit 35 starts the condenser 17. Then, the cooling water in the cold water tank controls the operation of the condenser 17 through the temperature control switch 18, reducing the water temperature to the target range of 10-20℃. Then, the gas storage cylinder 9 injects nitrogen into the cooling cylinder 1. The internal gas pressure is monitored by the pressure sensor 10 and maintained at the set value, while the pressure relief valve 11 is in the closed state.
[0034] Then, the cooling water is pressurized by the one-way valve 23 and the booster pump 25 through the inlet pipe 13 and enters the spiral flow channel of the cooling layer 4. The spiral cooling flow channel design increases the contact area between the cooling water and the inner tank 5. The high-temperature carbon-carbon composite material releases heat to the cooling layer 4 through the inner tank 5, accelerating heat conduction. At this time, the outlet pump 19 operates synchronously, discharging the heat-absorbing warm water into the first water storage tank 20 for temporary storage. The safety overflow valve 22 on the pressure balance pipe 21 balances the pressure in the pipe in real time to avoid the risk of overpressure. The temperature sensor 12 provides real-time feedback on the material temperature inside the cooling cylinder 1. When the detected temperature drop rate reaches the preset threshold, the main control device 35 triggers the stage switching signal.
[0035] The main control unit 35 then gradually reduces the power of the condenser 17 by adjusting the cooling parameters, while simultaneously starting the first water pump 29. Through the three-way valve a24, the warm water in the first water storage tank 20 is mixed with the low-temperature water in the cold water tank. The power of the booster pump 25 is simultaneously reduced, decreasing the water flow rate and slowing the heat exchange rate. The pressure sensor 10 continuously monitors the internal pressure. If pressure fluctuations occur due to material contraction, the main control unit 35 automatically controls the gas cylinder 9 to replenish nitrogen or fine-tunes the pressure through the pressure relief valve 11. The outlet pump 19 then discharges the heated cooling water into the second water storage tank 27 through the three-way valve b36. When the temperature drop rate reaches a preset threshold, the main control unit 35 triggers a stage switching signal.
[0036] Then, the condenser 17 is shut off, and the water temperature of the first water tank 20 and the second water tank 27 is balanced by the third water pump 33. The power of the booster pump 25 is simultaneously reduced to decrease the water flow rate and slow down the heat exchange rate. This ensures that the internal crystal structure of the material slowly reorganizes and the nitrogen pressure is maintained at a constant value.
Claims
1. A cooling and molding apparatus for carbon-carbon composite materials, comprising a cooling cylinder (1), characterized in that, The top of the cooling cylinder (1) is connected to a cover (7), and the top of the cover (7) is connected to a gas storage cylinder (9) through a gas supply pipe (8). The cover (7) is also connected to a pressure sensor (10), a pressure relief valve (11) and a temperature sensor (12). The cooling cylinder (1) is fixedly connected to an inlet pipe (13) and an outlet pipe (14). The inlet pipe (13) is connected to the cold water tank via an inlet pump (15), and the outlet pipe (14) is connected to the first water storage tank (20) via an outlet pump (19). The cold water tank and the first water storage tank (20) are both located inside the machine body (34). A second water storage tank (27) is also located inside the machine body (34). The main control device (35) is connected to the side wall of the machine body (34). The first water tank (20) is connected to a first water pipe (28) at its outlet. The first water pipe (28) is connected to the inlet pipe (13) via a three-way connector a (24). A first water pump (29) is connected to the first water pipe (28). The second water tank (27) is connected to a second water pipe (30) at its inlet. The second water pipe (30) is connected to the outlet pipe (14) via a three-way connector a (24). A second water pump (31) is connected to the second water pipe (30). The first water tank (20) and the second water tank (27) are connected via a third water pipe (32). A third water pump (33) is connected to the third water pipe (32). The main control device (35) is electrically connected to the pressure sensor (10), pressure relief valve (11), temperature sensor (12), inlet pump (15), outlet pump (19), first pump (29), second pump (31) and third pump (33).
2. The cooling and molding apparatus for carbon-carbon composite materials according to claim 1, characterized in that, The cooling cylinder (1) includes, from the outside to the inside, a protective shell (2), a heat insulation layer (3), a cooling layer (4) and an inner liner (5). The cooling layer (4) is provided with a spiral cooling channel (6). The cooling layer (4) is connected to the water inlet pipe (13) and the water outlet pipe (14).
3. The cooling and molding apparatus for carbon-carbon composite materials according to claim 1, characterized in that, The gas storage cylinder (9) contains an inert gas, namely nitrogen.
4. The cooling and molding apparatus for carbon-carbon composite materials according to claim 1, characterized in that, The cold water tank includes a tank body (16), a condenser (17) is connected to the bottom of the tank body (16), and a temperature control switch (18) is provided inside the tank body (16), which is electrically connected to the condenser (17).
5. The cooling and molding apparatus for carbon-carbon composite materials according to claim 1, characterized in that, A pressure balancing pipe (21) is provided between the water inlet pipe (13) and the water outlet pipe (14), and a safety overflow valve (22) is provided on the pressure balancing pipe (21).
6. The cooling and molding apparatus for carbon-carbon composite materials according to claim 5, characterized in that, A one-way valve (23) is connected to the water inlet pipe (13), and the one-way valve (23) is located between the three-way connector a (24) and the cold water tank.
7. The cooling and molding apparatus for carbon-carbon composite materials according to claim 6, characterized in that, A booster pump (25) and a pressure switch (26) are also connected to the water inlet pipe (13). The booster pump (25) and the pressure switch (26) are both electrically connected to the main control device (35).