Cooling device for zirconia high-temperature sintering furnace

Abstract

This utility model relates to the technical field of special ceramic manufacturing equipment, and in particular to a cooling device for a zirconia high-temperature sintering furnace. The device includes a furnace body, cooling pipes, and a return water pipe. A controller is installed in the furnace body, a cooling fan is installed at the rear of the furnace body, and a water tank is connected to the rear of the furnace body. An air inlet is opened in the furnace body at the rear, and a mounting frame is connected to the rear of the furnace body, surrounding the outer end of the air inlet. A fan is installed at the outer end of the mounting frame, and an annular pipe is connected inside the mounting frame. One end of the cooling pipe is connected to the water tank, and the other end is connected to the annular pipe. One end of the return water pipe is connected to the annular pipe, and the other end is connected to the water tank. A cooling component is installed on the water tank to circulate and reduce the temperature of the liquid inside. Through the cooperation of the fan, the annular pipe, and a first water pump, air flows through the annular pipe and exchanges heat with the coolant, pre-cooling the gas into a low-temperature airflow, which is then sent into the furnace body through the air inlet. The high-temperature gas discharge and the low-temperature gas input occur simultaneously, improving cooling efficiency.

Description

Technical Field

[0001] This utility model relates to the field of special ceramic manufacturing equipment technology, and in particular to a cooling device for a zirconia high-temperature sintering furnace. Background Technology

[0002] Zirconia ceramics are widely used in dental restorations and industrial structural components due to their excellent mechanical strength, biocompatibility, and aesthetics. Achieving their final properties relies on a high-temperature sintering process, typically carried out in a dedicated zirconia high-temperature sintering furnace. The core function of this furnace is to heat the zirconia preform to a high temperature of 1400°C to 1600°C under precisely controlled atmosphere and temperature programs and hold it at that temperature, allowing the internal particles of the preform to become denser through processes such as diffusion, migration, and recrystallization. However, after sintering, the furnace interior and the sintered product itself remain at extremely high temperatures. Therefore, an efficient and safe cooling process is crucial for improving production efficiency, ensuring operational safety, and guaranteeing product quality.

[0003] Currently, a high-temperature sintering furnace for zirconia blocks used in all-ceramic dentures, with announcement number CN214039556U, utilizes heat dissipation holes on the furnace body and a fan for airflow cooling. This airflow method uses air convection to remove some of the heat from the furnace surface and interior, aiming to accelerate the heat dissipation process to a certain extent.

[0004] However, in practical applications, cooling efficiency is low, and the high-temperature state lasts for a long time. Relying solely on air convection for heat dissipation has limited heat exchange capacity and cannot quickly remove the enormous heat contained within the furnace and the high-temperature sintered product, severely restricting equipment utilization and production efficiency. Secondly, during the long initial and middle stages of cooling, the temperature inside the furnace and on the surface of the sintered product is extremely high, making it unsafe for operators to open the furnace door for handling, posing a significant risk of burns. Relying solely on air blowing for heat dissipation is insufficient at high temperatures and makes it difficult to achieve rapid and uniform cooling. This not only prolongs the waiting time but may also increase the risk of residual stress inside the product and even induce microcracks, affecting the final product's performance and yield. Utility Model Content

[0005] To overcome the drawback of low cooling efficiency, this invention provides a high-efficiency cooling device for a zirconia high-temperature sintering furnace.

[0006] A cooling device for a zirconia high-temperature sintering furnace includes a furnace body, a cooling pipe, and a return water pipe. The furnace body is equipped with a controller. A cooling fan is installed at the rear of the furnace body. A water tank is connected to the rear of the furnace body. The furnace body has an air inlet at the rear. A mounting frame is connected to the rear of the furnace body, surrounding the outer end of the air inlet. A fan is installed at the outer end of the mounting frame. An annular pipe is connected inside the mounting frame. One end of the cooling pipe passes through the water tank and is connected to a first water pump. The other end of the cooling pipe is connected to one end of the annular pipe. One end of the return water pipe is connected to the other end of the annular pipe and the other end is connected to the water tank. The cooling pipe and the return water pipe are located on the left and right sides of the water tank, respectively. The first water pump is wired to the controller. A cooling component for circulating and reducing the temperature of the liquid inside the water tank is installed on the water tank.

[0007] Optionally, the cooling component includes an inlet pipe and an outlet pipe. A water-cooled radiator is installed on the top of the water tank. One end of the inlet pipe passes through the water tank and is connected to a second water pump. The second water pump is wired to the controller. The inlet pipe and the return pipe are located on the same side. The other end of the inlet pipe is connected to the water-cooled radiator. One end of the outlet pipe is connected to the water-cooled radiator, and the other end is connected to the water tank. The outlet pipe and the cooling pipe are located on the same side.

[0008] Optionally, a diversion pipe is connected inside the furnace body, the top of the diversion pipe is connected to the air inlet at the inner end of the furnace body, the diversion pipe has several air outlets, and several deflector plates are connected inside the diversion pipe, the deflector plates are provided with inclined surfaces facing the air outlets.

[0009] Optionally, a heat insulation plate is connected to the middle of the water tank, and the cooling pipe and the return water pipe are located on the left and right sides of the heat insulation plate, respectively.

[0010] Optionally, two liquid level sensors are installed in the water tank, located on the left and right sides of the heat insulation plate, respectively, and the liquid level sensors are wired to the controller.

[0011] Optionally, a plurality of stabilizing frames are connected to the rear side of the furnace body, and the stabilizing frames are used to house the cooling pipe and the return water pipe.

[0012] Optionally, a protective net is connected to the rear side of the water-cooled radiator, and a protective net is connected to the port of the mounting frame.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. Through the cooperation of the fan, the annular pipe and the first water pump, the air flows through the annular pipe and exchanges heat with the coolant, pre-cooling the gas into a low-temperature airflow, which is then sent into the furnace body through the air inlet. The high-temperature gas is discharged and the low-temperature gas is input simultaneously, improving the cooling efficiency.

[0015] 2. By combining the diverter and the deflector, the incoming cold air is divided into multiple airflows and blown evenly into the furnace from the air outlets at different locations. This eliminates the temperature gradient inside the furnace, prevents stress cracks in the zirconia sintered body due to uneven cooling, ensures product yield, and at the same time makes the surface temperature of the furnace body drop rapidly and evenly. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a schematic diagram showing the connection relationship between the return water pipe and the mounting frame of this utility model.

[0018] Figure 3 This is a cross-sectional view showing the connection relationship between the fan and the annular tube of this utility model.

[0019] Figure 4 This is a cross-sectional view showing the connection relationship between the cooling pipe and the first water pump of this utility model.

[0020] Figure 5 This is a cross-sectional view of the specific structure of the diversion tube of this utility model.

[0021] The markings in the attached diagram are as follows: 1: Furnace body, 2: Controller, 21: Cooling fan, 3: Water tank, 4: Cooling pipe, 41: First water pump, 5: Circular pipe, 6: Mounting frame, 61: Air inlet, 7: Fan, 8: Return water pipe, 9: Water inlet pipe, 10: Second water pump, 11: Water-cooled radiator, 12: Water outlet pipe, 13: Diverter pipe, 14: Reverse flow plate, 15: Air outlet, 16: Heat insulation plate, 17: Liquid level sensor, 18: Stabilizer, 19: Protective net. Detailed Implementation

[0022] The embodiments of this utility model will be described below with reference to the accompanying drawings.

[0023] Example: A cooling device for a zirconia high-temperature sintering furnace, such as... Figures 1-4As shown, the system includes a furnace body 1, a controller 2, a cooling fan 21, a water tank 3, a cooling pipe 4, a first water pump 41, a ring pipe 5, a mounting frame 6, a fan 7, a return water pipe 8, and cooling components. The controller 2 is mounted on the furnace body 1. The cooling fan 21 is mounted on the rear side of the furnace body 1. The water tank 3 is connected to the rear side of the furnace body 1. The furnace body 1 has an air inlet 61 that enters its interior from the rear. The mounting frame 6 is connected to the rear side of the furnace body 1, surrounding the outer end of the air inlet 61. The fan 7 is mounted on the outer end of the mounting frame 6. An annular pipe 5 is connected inside the mounting frame 6. One end of the cooling pipe 4 passes through the water tank 3 and is connected to the first water pump 41. The other end of the cooling pipe 4 is connected to one end of the annular pipe 5. One end of the return water pipe 8 is connected to the other end of the annular pipe 5, and the other end of the return water pipe 8 is connected to the water tank 3. The cooling pipe 4 and the return water pipe 8 are located on the left and right sides of the water tank 3, respectively. After sintering, the controller 2 starts the cooling fan 21 to exhaust the high-temperature air in the furnace. At the same time, the fan 7 sends the outside air through the mounting frame 6 into the air inlet 61 of the furnace body 1. The first water pump 41 pumps the low-temperature liquid on the left side of the water tank 3 into the cooling pipe 4 and delivers it to the annular pipe 5 inside the mounting frame 6. When the air flows through the annular pipe 5, it exchanges heat with the low-temperature liquid inside the pipe. The cooled air enters the furnace body 1 from the air inlet 61. After absorbing heat, the liquid flows back to the right side of the water tank 3 through the return water pipe 8, forming a cycle. The first water pump 41 is wired to the controller 2. The water tank 3 is equipped with a cooling component for circulating and reducing the temperature of the liquid in the water tank 3. Through gas-liquid dual heat exchange, the cooling efficiency is greatly improved. The annular pipe 5 is integrated into the air inlet path to achieve gas pre-cooling and prevent high-temperature gas from directly entering the furnace body 1. Liquid recycling reduces energy consumption.

[0024] like Figures 1-4 As shown, the cooling assembly includes an inlet pipe 9, a second water pump 10, a water-cooled radiator 11, and an outlet pipe 12. The water-cooled radiator 11 is installed on the top of the water tank 3. One end of the inlet pipe 9 passes through the water tank 3 and is connected to the second water pump 10. The second water pump 10 is wired to the controller 2. The inlet pipe 9 and the return pipe 8 are located on the same side. The other end of the inlet pipe 9 is connected to the water-cooled radiator 11. One end of the outlet pipe 12 is connected to the water-cooled radiator 11, and the other end is connected to the water tank 3. The outlet pipe 12 and the cooling pipe 4 are located on the same side. The second water pump 10 draws liquid from the right side of the water tank 3 and pumps it into the water-cooled radiator 11 through the inlet pipe 9 for cooling. The cooled liquid flows back to the left side of the water tank 3 through the outlet pipe 12. The independent liquid cooling circulation system continuously reduces the temperature of the liquid in the water tank 3, ensuring heat exchange efficiency. The dual-pump side control optimizes the liquid flow path and avoids temperature crosstalk.

[0025] like Figure 1 , Figure 3 and Figure 5As shown, it also includes a diversion pipe 13 and a backflow plate 14. The diversion pipe 13 is connected inside the furnace body 1. The top of the diversion pipe 13 is connected to the air inlet 61 located at the inner end of the furnace body 1. The diversion pipe 13 has several air outlets 15. Several backflow plates 14 are connected inside the diversion pipe 13. The air is evenly distributed to multiple air outlets 15 by the internal backflow plates 14 and blown into the furnace from different positions to prevent stress cracks from occurring in the zirconia sintered body due to uneven cooling. The backflow plate 14 is provided with an inclined surface facing the air outlet 15.

[0026] like Figure 4 As shown, it also includes a heat insulation plate 16. The heat insulation plate 16 is connected to the middle of the water tank 3. The cooling pipe 4 and the return water pipe 8 are located on the left and right sides of the heat insulation plate 16, respectively, physically separating the high-temperature reflux zone on the left and the low-temperature output zone on the right.

[0027] like Figure 4 As shown, the system also includes liquid level sensors 17. Two liquid level sensors 17 are installed inside the water tank 3, located on the left and right sides of the heat insulation plate 16, respectively. The liquid level sensors 17 are wired to the controller 2. The two liquid level sensors 17 monitor the difference in liquid level height between the two sides of the heat insulation plate 16 in the water tank 3 in real time. If the difference exceeds the threshold, a signal is sent to the controller 2 to automatically adjust the power of the first water pump 41 and the second water pump 10 to balance the liquid distribution on both sides, ensuring the continuous and stable operation of the cooling system and reducing manual intervention.

[0028] like Figure 3 As shown, it also includes a stabilizer 18. Several stabilizers 18 are connected to the rear side of the furnace body 1. The stabilizers 18 are used to mount the cooling pipe 4 and the return water pipe 8 to constrain the vibration of the pipeline and prevent the liquid conveying pipeline from shifting or leaking due to vibration.

[0029] like Figure 2 As shown, it also includes a protective net 19. The water-cooled radiator 11 is connected to the rear side of the protective net 19, and the mounting frame 6 is connected to the protective net 19 to ensure clean airflow and protect the core heat dissipation components.

[0030] The operator starts the furnace body 1 via controller 2 to sinter the material. After sintering, the cooling fan 21 and fan 7 are turned on. The high-temperature air inside the furnace body 1 is exhausted by the cooling fan 21, and the low-temperature air is blown in by the fan 7. At the same time, the first water pump 41, the water-cooled radiator 11, and the second water pump 10 are turned on. The second water pump 10 draws liquid from the right side of the water tank 3 and delivers it into the water-cooled radiator 11 through the inlet pipe 9. The water-cooled radiator 11 cools the incoming liquid, and then it flows into the left side of the water tank 3 through the outlet pipe 12. Water pump 41 draws the low-temperature liquid from the left side of water tank 3 and enters the annular pipe 5 along the cooling pipe 4. The air blown in by fan 7 enters the furnace body 1 along the mounting frame 6 and the air inlet 61. When the air passes through the mounting frame 6, the low-temperature liquid in the annular pipe 5 absorbs the temperature of the outside gas. The gas exchanges heat when passing through the annular pipe 5, and the gas blown in from the air inlet 61 becomes low-temperature gas. The liquid in the annular pipe 5 then flows back into water tank 3 through the return water pipe 8. The first water pump 41 and the second water pump 10 realize the recycling of the liquid.

[0031] The cold air entering the diversion pipe 13 is diverted by the deflector plates 14 at different positions and blown out from different air outlets 15, uniformly cooling the furnace body 1. The liquid level sensor 17 monitors the liquid level in the left and right parts of the water tank 3 respectively. If the liquid level difference is large, that is, the liquid level difference reaches the flow interruption threshold, an adjustment signal is sent to the controller 2. The controller 2 adjusts the power of the first water pump 41 and the second water pump 10, so that the liquid in the water tank 3 is evenly distributed and the liquid delivery is stable. The stabilizer 18 stabilizes the return water pipe 8 and the cooling pipe 4 to ensure the stability of the liquid delivery. The protective net 19 protects the water-cooled radiator 11 and also filters the gas entering the furnace body 1 from the mounting frame 6 to ensure the cleanliness of the airflow.

[0032] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present application. Therefore, the content of this specification should not be construed as a limitation of the present application.

Claims

1. A cooling device for a zirconia high-temperature sintering furnace, characterized by: The furnace includes a furnace body (1), a cooling pipe (4), and a return water pipe (8). The furnace body (1) is equipped with a controller (2). A cooling fan (21) is installed on the rear side of the furnace body (1). A water tank (3) is connected to the rear side of the furnace body (1). The furnace body (1) has an air inlet (61) that enters its interior from the rear. A mounting frame (6) is connected to the rear side of the furnace body (1). The mounting frame (6) surrounds the outer end of the air inlet (61). A fan (7) is installed on the outer end of the mounting frame (6). An annular pipe (5) is connected inside the mounting frame (6). The cooling pipe (4)... The end of the cooling pipe (4) passes through the water tank (3) and is connected to the first water pump (41). The other end of the cooling pipe (4) is connected to one end of the annular pipe (5). One end of the return water pipe (8) is connected to the other end of the annular pipe (5). The other end of the return water pipe (8) is connected to the water tank (3). The cooling pipe (4) and the return water pipe (8) are located on the left and right sides of the water tank (3) respectively. The first water pump (41) is wired to the controller (2). The water tank (3) is equipped with a cooling component for circulating and reducing the temperature of the liquid in the water tank (3).

2. The cooling device for a zirconia high-temperature sintering furnace according to claim 1, characterized in that: The cooling component includes an inlet pipe (9) and an outlet pipe (12). A water-cooled radiator (11) is installed on the top of the water tank (3). One end of the inlet pipe (9) passes through the water tank (3) and is connected to a second water pump (10). The second water pump (10) is wired to the controller (2). The inlet pipe (9) and the return pipe (8) are located on the same side. The other end of the inlet pipe (9) is connected to the water-cooled radiator (11). One end of the outlet pipe (12) is connected to the water-cooled radiator (11), and the other end is connected to the water tank (3). The outlet pipe (12) and the cooling pipe (4) are located on the same side.

3. The cooling device for a zirconia high-temperature sintering furnace according to claim 2, characterized in that: The furnace body (1) is connected to a diversion pipe (13). The top of the diversion pipe (13) is connected to the air inlet (61) at the inner end of the furnace body (1). The diversion pipe (13) has several air outlets (15). The diversion pipe (13) is connected to several backflow plates (14). The backflow plates (14) are provided with inclined surfaces facing the air outlets (15).

4. The cooling device for a zirconia high-temperature sintering furnace according to claim 3, characterized in that: A heat insulation plate (16) is connected to the middle of the water tank (3), and the cooling pipe (4) and the return water pipe (8) are located on the left and right sides of the heat insulation plate (16), respectively.

5. A cooling device for a zirconia high-temperature sintering furnace according to claim 4, characterized in that: Two liquid level sensors (17) are installed in the water tank (3), located on the left and right sides of the heat insulation plate (16) respectively. The liquid level sensors (17) are wired to the controller (2).

6. A cooling device for a zirconia high-temperature sintering furnace according to claim 5, characterized in that: The furnace body (1) is connected to a number of stabilizers (18) on the rear side. The stabilizers (18) are used to house the cooling pipe (4) and the return water pipe (8).

7. A cooling device for a zirconia high-temperature sintering furnace according to claim 6, characterized in that: A protective net (19) is connected to the rear side of the water-cooled radiator (11), and a protective net (19) is connected to the port of the mounting frame (6).

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