High-purity zirconia calcining furnace

Abstract

The utility model belongs to calcining furnace technical field, specifically disclose a kind of high-purity zirconia calcining furnace, including furnace body, the bottom of furnace body is provided with air inlet, air inlet upper is provided with the air inlet component for guiding and dispersing airflow;Air inlet component includes the flow guide structure being arranged in the inside of furnace body and being located above air inlet, flow guide structure has the flow guide cone that gradually expands from bottom to top, the upper end of flow guide cone is connected with the multiple shunt plates that are evenly distributed along circumference, the utility model is entered into stove when external air is evenly speed by the air inlet being opened in the bottom center of furnace body, airflow flows to air inlet component when upwards, contact the flow guide cone and shunt plate of flow guide structure directly above air inlet, avoid airflow direct to stove top and cause local air concentration, and airflow is dispersed into multiple uniform horizontal airflow, finally realize airflow in the inside of furnace body global uniform diffusion, provide sufficient oxygen for calcining.

Description

Technical Field

[0001] This application relates to the field of calcining furnace technology, and more specifically, to a high-purity zirconium oxide calcining furnace. Background Technology

[0002] Zirconia calcining furnaces are industrial equipment specifically designed for high-temperature calcination of zirconia raw materials (or their blanks, such as ceramic denture blanks or electronic component blanks). Their core function is to remove impurities such as moisture and organic matter from the raw materials by precisely controlling the high-temperature environment, while simultaneously promoting the transformation and densification of the zirconia crystal structure, ultimately obtaining zirconia finished products that meet usage requirements (such as strength, purity, and stability).

[0003] The patent with publication number CN206321053U discloses a high-purity zirconia calcining furnace. This patent uses electric heating, which is clean and pollution-free. At the same time, it adopts a hemispherical design and a silicon controlled rectifier intelligent control system to control three sets of heating wires to heat the product evenly, ensuring precise control of the temperature inside the calcining furnace and no dead angles in heating.

[0004] Although the patent uses electric heating which is clean and pollution-free, the air inlet is only located in the center of the furnace bottom and lacks a flow guiding structure. This results in a lack of airflow guidance, causing the airflow to easily impact the top of the furnace cavity vertically upwards. This can lead to uneven airflow distribution in the upper and lower parts of the furnace cavity, resulting in differences in local oxygen concentration and heat exchange efficiency, which affects the quality of forging. Utility Model Content

[0005] To address the aforementioned problems, this application provides a high-purity zirconium oxide calcining furnace.

[0006] The high-purity zirconium oxide calcining furnace provided in this application adopts the following technical solution:

[0007] A high-purity zirconium oxide calcining furnace includes a furnace body, an air inlet at the bottom of the furnace body, and an air inlet assembly above the air inlet for guiding and dispersing airflow.

[0008] The air inlet assembly includes a flow guide structure located inside the furnace body and above the air inlet. The flow guide structure has a flow guide cone that gradually expands from bottom to top, and the upper end of the flow guide cone is connected to multiple flow dividers that are evenly distributed circumferentially.

[0009] With the above technical solution, when external air enters the furnace at a uniform speed through the air inlet at the center of the bottom of the furnace body, the airflow flows upward to the air inlet assembly and contacts the guide cone and the diverter plate of the guide structure directly above the air inlet. This prevents the airflow from rushing directly to the top of the furnace and causing local air concentration, and disperses the airflow into multiple uniform horizontal airflows. Ultimately, this achieves uniform diffusion of the airflow throughout the furnace body, providing sufficient oxygen for calcination.

[0010] Furthermore, an air outlet is provided on the top of the furnace body, and a pressure relief valve is installed inside the air outlet.

[0011] Furthermore, the air outlet has slots inside, and a filter screen is installed at the top of the air outlet.

[0012] Through the above technical solution, the filter screen prevents dust in the environment from flowing back into the furnace body from the air outlet and contaminating the high-purity zirconium oxide material.

[0013] Furthermore, a plug plate is fixedly connected to the bottom of the filter screen, and the plug plate is inserted into the slot.

[0014] With the above technical solution, if the filter becomes clogged after long-term use, the operator can manually pull the filter upwards to separate the fixed plate at the bottom of the filter from the preset slot inside the air outlet, thus completing the disassembly, cleaning or replacement of the filter. The operation is convenient and does not affect the overall operation of the equipment.

[0015] Furthermore, the furnace body has two connecting plates fixedly connected inside, and one end of each connecting plate is fixedly connected to a placement frame for carrying materials.

[0016] Furthermore, multiple heating plates are arranged around the outer perimeter of the furnace body, and each heating plate is equipped with an electric heating wire inside.

[0017] Furthermore, a sealed door is provided on the front side of the furnace body.

[0018] Furthermore, a frame is provided at the bottom of the furnace body.

[0019] In summary, this application includes at least one of the following beneficial technical effects:

[0020] (1) By setting up the air inlet component, when the external air enters the furnace at a constant speed through the air inlet at the center of the bottom of the furnace body, the airflow flows upward to the air inlet component and contacts the guide cone and the diverter plate of the guide structure directly above the air inlet, thus avoiding the airflow from rushing directly to the top of the furnace and causing local air concentration, and dispersing the airflow into multiple uniform horizontal airflows, so as to achieve uniform diffusion of the airflow throughout the furnace body and provide sufficient oxygen for calcination;

[0021] (2) The filter screen installed at the top of the air outlet of this utility model prevents dust in the environment from flowing back into the furnace body from the air outlet and contaminating the high-purity zirconium oxide material. If the filter screen becomes clogged after long-term use, the operator can manually pull the filter screen upwards to separate the fixed plate at the bottom of the filter screen from the preset slot inside the air outlet, so that the filter screen can be disassembled, cleaned or replaced. The operation is convenient and does not affect the overall operation of the equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a side view of the present invention;

[0024] Figure 3 This is a cross-sectional view of the furnace body of this utility model;

[0025] Figure 4 This is a plan view of the present invention;

[0026] Figure 5 This is a schematic diagram of the connection structure between the insert plate and the slot of this utility model.

[0027] Explanation of reference numerals in the attached drawings: 1. Furnace body; 2. Sealing door; 3. Heating plate; 4. Frame; 5. Air inlet; 6. Placement frame; 7. Connecting plate; 8. Pressure relief valve; 9. Air outlet; 10. Filter screen; 11. Guide cone; 12. Diverter plate; 13. Slot; 14. Insert plate. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] Reference Figures 1-5 A high-purity zirconium oxide calcining furnace includes a furnace body 1, an air inlet 5 at the bottom of the furnace body 1, and an air inlet assembly for guiding and dispersing airflow above the air inlet 5.

[0030] The air inlet assembly includes a flow guide structure disposed inside the furnace body 1 and above the air inlet 5. The flow guide structure has a flow guide cone 11 that gradually expands from bottom to top, and the upper end of the flow guide cone 11 is connected to a plurality of flow dividers 12 that are evenly distributed in the circumferential direction.

[0031] First, material preparation and sealing are carried out. The operator manually opens the sealing door 2 on the front side of the furnace body 1 and evenly spreads the high-purity zirconia billet to be calcined on the placement frame 6 inside the furnace body 1. The placement frame 6 is securely connected to the inner wall of the furnace body 1 by the connecting plate 7. The connecting plate 7 is made of high-temperature resistant alloy material to prevent deformation at high temperatures that could cause the placement frame 6 to shift, ensuring that the material is always in the central heating area inside the furnace. After the material is placed, the sealing door 2 is closed, so that a closed calcination space is formed inside the furnace body 1.

[0032] Next, the heating system is activated to create a high-temperature environment. The power supply to multiple heating plates 3 evenly distributed around the outer perimeter of the furnace body 1 is turned on. The electric heating wires built into the heating plates 3 heat up rapidly after being energized. The heat is conducted to the interior of the furnace body 1 through the contact surface between the heating plates 3 and the outer shell of the furnace body 1. Since the heating plates 3 are evenly distributed in a ring around the outer perimeter of the furnace body 1, it can ensure that the heat diffuses synchronously from the perimeter of the furnace wall to the center, avoiding local temperature differences inside the furnace. This provides stable high-temperature conditions for the transformation of the high-purity zirconia crystal structure and the removal of impurities. High-purity zirconia calcination usually requires a high temperature of 800-1200℃. The power of the electric heating wires of the heating plates 3 can be adjusted by an external control system (existing technology, not shown in the figure) to adapt to the temperature requirements of different calcination stages.

[0033] External air enters the furnace at a constant speed through the air inlet 5 at the center of the bottom of the furnace body 1. When the airflow flows upward to the air inlet assembly, it comes into contact with the guide cone 11 and the diverter plate 12 of the guide structure directly above the air inlet 5. This prevents the airflow from rushing directly to the top of the furnace and causing local air concentration, and disperses the airflow into multiple uniform horizontal airflows. Ultimately, the airflow is uniformly diffused throughout the furnace body 1, providing sufficient oxygen for calcination.

[0034] Reference Figures 1-3 The top of the furnace body 1 is provided with an air outlet 9, the air outlet 9 is provided with a pressure relief valve 8, the air outlet 9 is provided with a slot 13, the top of the air outlet 9 is provided with a filter screen 10, and the bottom of the filter screen 10 is fixedly connected with a plug plate 14, which is inserted into the slot 13.

[0035] During the calcination process, the high-temperature mixed gas generated inside the furnace will naturally rise and be discharged outward through the air outlet 9 at the top of the furnace body 1. During the discharge process, the pressure relief valve 8 installed inside the air outlet 9 will sense the gas pressure inside the furnace in real time. When the gas pressure inside the furnace exceeds the preset threshold due to the expansion of the gas due to heat, the valve core of the pressure relief valve 8 will open upward under the action of gas pressure to release excess gas and prevent the gas pressure inside the furnace from rising suddenly, which could damage the sealing structure of the furnace body 1 or cause temperature fluctuations. When the gas pressure inside the furnace drops to a safe range, the return spring of the pressure relief valve 8 will drive the valve core to close automatically, maintaining the stability of the gas pressure inside the furnace.

[0036] Meanwhile, the filter screen 10 installed at the top of the air outlet 9 (made of high-temperature resistant stainless steel with a mesh size of 80-100, which can block micron-sized dust particles) will form a physical barrier against the outside air, preventing dust in the environment from flowing back into the furnace body 1 from the air outlet 9 and contaminating the high-purity zirconium oxide material. If the filter screen 10 becomes clogged after long-term use, the operator can manually pull the filter screen 10 upwards to separate the insert plate 14 fixed at the bottom of the filter screen 10 from the slot 13 preset inside the air outlet 9, thus completing the disassembly, cleaning or replacement of the filter screen 10. The operation is convenient and does not affect the overall operation of the equipment.

[0037] Reference Figures 3-5The furnace body 1 has two connecting plates 7 fixedly connected inside, and one end of each connecting plate 7 is fixedly connected to a placement frame 6 for carrying materials. Multiple heating plates 3 are arranged around the outer perimeter of the furnace body 1, and each heating plate 3 is equipped with an electric heating wire. A sealing door 2 is provided on the front side of the furnace body 1, and a frame 4 is provided at the bottom of the furnace body 1.

[0038] Working principle: First, the material is prepared and sealed. The operator manually opens the sealing door 2 on the front side of the furnace body 1 and evenly spreads the high-purity zirconia billet to be calcined on the placement frame 6 inside the furnace body 1. The placement frame 6 is fixedly connected to the inner wall of the furnace body 1 by two connecting plates 7. The connecting plates 7 are made of high-temperature resistant alloy material to prevent deformation under high temperature from causing the placement frame 6 to shift, ensuring that the billet is in the central heating area inside the furnace. After the material is placed, the sealing door 2 is closed, so that a closed calcination space is formed inside the furnace body 1.

[0039] Next, the heating system is started by an external drive mechanism, and the power supply to the multiple heating plates 3 evenly arranged around the outer periphery of the furnace body 1 is turned on. The electric heating wires inside the heating plates 3 generate heat after being energized. The heat is conducted into the furnace through the contact surface between the heating plates 3 and the outer shell of the furnace body 1. Because the heating plates 3 are evenly distributed in a ring around the outer periphery of the furnace body 1, the heat diffuses synchronously from the four sides of the furnace wall to the center, avoiding local temperature differences in the furnace. This provides a stable high temperature of 800-1200℃ for the transformation of high-purity zirconia crystal structure and the removal of impurities. The power of the electric heating wires of the heating plates 3 can be adjusted by an external control system to adapt to the needs of different calcination stages.

[0040] Meanwhile, clean external air enters the furnace at a constant speed through the air inlet 5 at the center of the bottom of the furnace body 1. The airflow flows upward to the air inlet assembly and contacts the guide cone 11 and the diverter plate 12 of the guide structure above the air inlet 5. This prevents the airflow from rushing directly to the top of the furnace and causing local air concentration. The airflow is dispersed into multiple uniform horizontal airflows, which diffuse evenly throughout the entire interior of the furnace body 1, providing sufficient oxygen for calcination.

[0041] During the calcination process, the high-temperature mixed gas generated inside the furnace gathers upward and is discharged through the air outlet 9 at the top of the furnace body 1. When the gas is discharged, the pressure relief valve 8 inside the air outlet 9 senses the gas pressure inside the furnace in real time. When the gas pressure exceeds the preset threshold, the valve core of the pressure relief valve 8 opens upward to release excess gas, preventing damage to the sealing structure of the furnace body 1 or temperature fluctuations. After the gas pressure drops to a safe range, the return spring of the pressure relief valve 8 drives the valve core to close to maintain stable gas pressure. At the same time, the filter screen 10 at the top of the air outlet 9 blocks external dust from flowing back in. The insert plate 14 at the bottom of the filter screen 10 is inserted into the slot 13 inside the air outlet 9. It can be pulled out when cleaning or replacement is required.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-purity zirconium oxide calcining furnace, characterized in that, include: Furnace body (1), with an air inlet (5) at the bottom of the furnace body (1) and an air inlet assembly for guiding and dispersing airflow above the air inlet (5); The air intake assembly includes a flow guide structure disposed inside the furnace body (1) and above the air inlet (5). The flow guide structure has a flow guide cone (11) that gradually expands from bottom to top. The upper end of the flow guide cone (11) is connected to a plurality of flow dividers (12) that are evenly distributed along the circumference.

2. The high-purity zirconium oxide calcining furnace according to claim 1, characterized in that: The top of the furnace body (1) is provided with an air outlet (9), and the air outlet (9) is provided with a pressure relief valve (8).

3. The high-purity zirconium oxide calcining furnace according to claim 2, characterized in that: The air outlet (9) has a slot (13) inside, and a filter screen (10) is provided at the top of the air outlet (9).

4. A high-purity zirconium oxide calcining furnace according to claim 3, characterized in that: The bottom of the filter screen (10) is fixedly connected to a plug plate (14), which is inserted into the slot (13).

5. A high-purity zirconium oxide calcining furnace according to claim 1, characterized in that: The furnace body (1) has two connecting plates (7) fixedly connected inside, and one end of each of the two connecting plates (7) is fixedly connected to a placement frame (6) for carrying materials.

6. The high-purity zirconium oxide calcining furnace according to claim 1, characterized in that: The furnace body (1) is provided with multiple heating plates (3) on its outer periphery, and each heating plate (3) is provided with an electric heating wire inside.

7. A high-purity zirconium oxide calcining furnace according to claim 1, characterized in that: The furnace body (1) is provided with a sealing door (2) on the front side.

8. A high-purity zirconium oxide calcining furnace according to claim 1, characterized in that: The furnace body (1) is provided with a frame (4) at the bottom.

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