Vacuum box type atmosphere furnace

Abstract

According to the technical scheme, the vacuum box type atmosphere furnace is characterized by comprising a furnace body with a hearth, a gas path system and a control system. The furnace body is provided with a feeding port, and the feeding port is attached to the furnace door in a sealed mode through a sealing flange. The sealing structure comprises a sealing groove and a sealing rubber strip installed on the inner side of the furnace door, an electromagnetic assembly is arranged in the sealing groove, the inner wall of the sealing groove is made to have magnetism under the action of a magnetic field, the sealing groove is matched with the sealing rubber strip filled with magnetic fluid, and reliable magnetic fluid sealing is formed. The sealing rubber strip is made of high-temperature silica gel or fluororubber and has the elastic deformation capacity, the end of the sealing rubber strip can be attached to the sealing groove when pressed, and gas leakage is prevented. Meanwhile, a cooling mechanism is arranged, cooling is achieved through circulating water in a cooling cavity, sealing performance is maintained, and high-temperature failure is avoided. The problem of failure caused by high-temperature aging of a traditional sealing material is solved, the sealing life is prolonged through the cooling system, the sealing stability and the working efficiency of the atmosphere furnace are improved, and the sealing device is particularly suitable for precise heat treatment application in the high-temperature and high-pressure environment.

Description

Technical Field

[0001] This utility model relates to the field of heating equipment technology, specifically to a vacuum box-type atmosphere furnace. Background Technology

[0002] A vacuum atmosphere furnace, also known as a vacuum atmosphere sintering furnace, is a device that sinterstallates materials in a furnace chamber under an atmosphere below one atmosphere, through which a specific gas is introduced. It is a novel heat treatment device combining vacuum technology and heat treatment technology, widely used in production and experimentation in metallurgy, electronics, glass, refractory materials, building materials, and other fields. Selecting a suitable atmosphere for sintering different materials facilitates the sintering process, improves the densification of the finished product, and yields products with superior performance.

[0003] To ensure the purity of the atmosphere and the stability of the gas pressure within the furnace chamber during sintering, the sealing performance between the furnace door and the furnace body is crucial to the sintering results. Existing vacuum atmosphere furnaces typically use flexible sealing materials such as high-temperature silicone gaskets or sealing rings to fill the tiny gaps between the furnace door and the furnace body to improve the sealing effect. However, to ensure that the sealing material can completely fill the gaps between the furnace door and the furnace body, existing equipment also requires bolts or other fasteners to compress and secure the furnace door, thereby applying compressive force to the sealing material, causing it to deform when the furnace door is closed to fill the gaps.

[0004] However, in actual use, the heat inside the furnace chamber is conducted to the seals, causing the sealing material to age and lose elasticity at high temperatures after prolonged use. This results in the seals being unable to effectively fill the tiny gaps between the furnace door and the furnace body, leading to gas leakage. Furthermore, the flexible parts are subjected to compression for extended periods, which accelerates the mechanical wear and aging of the seals, requiring frequent replacements and increasing the workload for staff. Utility Model Content

[0005] This invention proposes a vacuum box-type atmosphere furnace, which solves the problems of unstable furnace door sealing effect and sealing failure caused by aging of sealing materials in existing atmosphere furnaces.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a vacuum box-type atmosphere furnace, comprising a body, a furnace body with a furnace chamber, a control system, and a gas path system connected to the furnace chamber, wherein the furnace body is provided with a feed inlet and a sealing flange is provided at the feed inlet; further comprising a furnace door rotatably mounted on the body, wherein the furnace door and the sealing flange are sealed together by a sealing structure; the sealing structure includes a sealing groove disposed on the periphery of the sealing flange, wherein an electromagnetic component is disposed in the sealing groove to make the inner wall of the sealing groove magnetic; further comprising a sealing strip disposed on the inner side of the furnace door and corresponding to the shape and position of the sealing groove, wherein the sealing strip is elastically deformable and has a fluid cavity disposed inside, wherein the fluid cavity is filled with a magnetic fluid.

[0007] The present invention is further configured such that the sealing groove has a T-shaped structure, and the end of the sealing strip can deform towards the concave sides of the sealing groove after being pressed.

[0008] The present invention is further provided with a cooling mechanism on the sealing strip, the cooling mechanism being used to cool and reduce the temperature of the sealing strip and the magnetic fluid inside it.

[0009] The present invention is further configured such that the cooling mechanism includes a cooling cavity disposed in the middle of the sealing strip, and the fluid cavity is wrapped around the outside of the cooling cavity; the cooling cavity is also provided with an inlet pipe and an outlet pipe that pass through the furnace door and are exposed to the outside, and both the inlet pipe and the outlet pipe are connected to a water tank, and a water pump is provided at the connection between the outlet pipe and the water tank.

[0010] The present invention is further configured such that the shape of the fluid cavity matches that of the cooling cavity.

[0011] The present invention is further configured such that a limiting strip is provided on one end face of the sealing strip facing the sealing groove, the limiting strip is made of solid material and flexible material, a limiting groove is provided at the bottom of the inner wall of the sealing groove to abut against the limiting strip, and the cross-section of the limiting strip is arc-shaped.

[0012] The present invention is further configured such that the sealing flange is a hollow pipe, and the electromagnetic component is disposed inside the cavity of the sealing flange.

[0013] The present invention is further configured such that the electromagnetic component includes an electromagnet disposed within the sealing flange, the electromagnet being in contact with the side wall of the sealing groove, and the electromagnet being connected to a power supply connected to the control system.

[0014] The present invention is further configured such that the sealing strip can be made of high-temperature silicone or fluororubber.

[0015] In summary, the beneficial effects of this utility model are as follows:

[0016] Compared with existing technologies, this application incorporates an electromagnetic component within the sealing groove, imbuing the inner wall of the groove with magnetism. This, in turn, interacts with a sealing strip filled with magnetic fluid, forming a magnetic fluid sealing structure. This magnetic fluid seal exhibits strong adaptability, allowing the sealing strip to adjust and change shape to follow the sealing groove, ensuring tight contact between the strip and the groove. This enhances the elastic deformation capability of the sealing strip, while the fluidity of the magnetic fluid contributes to a more stable sealing effect. Furthermore, since the sealing strip expands or contracts with changes in furnace temperature and pressure, the magnetic fluid seal dynamically adjusts the shape of the sealing strip, ensuring it remains tightly fitted to the inner wall of the sealing groove, maintaining constant sealing performance. This allows the sealing structure to maintain excellent sealing performance even under extreme operating conditions. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of this embodiment.

[0018] Figure 2 This is a schematic diagram of the furnace door opening in this embodiment.

[0019] Figure 3 This is a three-dimensional structural diagram of the furnace body.

[0020] Figure 4 This is an exploded view of the furnace body.

[0021] Figure 5 This is a cross-sectional structural diagram of the furnace body.

[0022] Figure 6 This is an enlarged view of the sealing structure.

[0023] Reference numerals in the attached drawings: 1. Machine body; 2. Furnace body; 3. Furnace chamber; 4. Feed inlet; 5. Sealing flange; 6. Sealing structure; 61. Sealing groove; 62. Electromagnetic assembly; 63. Sealing strip; 64. Fluid chamber; 7. Cooling mechanism; 71. Cooling chamber; 72. Water outlet pipe; 73. Water inlet pipe; 74. Water tank; 75. Water pump; 8. Limiting strip; 10. Cavity; 11. Electromagnet; 12. Fire baffle brick; 13. Furnace door. Detailed Implementation

[0024] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of this utility model.

[0025] like Figure 1-6As shown, this embodiment discloses a vacuum box-type atmosphere furnace, including a body 1, a furnace body 2 with a furnace chamber 3, a control system, and a gas path system connected to the furnace chamber 3.

[0026] The gas supply system and control system are existing technologies, both housed within the main body 1. The gas supply system is responsible for supplying the required gases to the furnace 3, while the control system precisely adjusts the atmosphere within the furnace 3 according to actual needs. The gas supply system includes components such as an inlet pipe, an outlet pipe, gas regulating valves, and gas sensors. It can adjust the gas flow and composition in real time according to the instructions of the control system, ensuring the stability of the atmosphere within the furnace 3. In high-temperature operating environments, the efficiency of the gas supply system is crucial for maintaining the uniformity of the gas inside the furnace 3. The control system monitors parameters such as atmosphere, temperature, and pressure within the furnace 3 in real time through sensors, and then automatically adjusts various valves and fans in the gas supply system via a PLC control board to achieve precise temperature control and atmosphere regulation.

[0027] Through this close coordination, the gas path system not only provides the required atmosphere to the furnace 3, but also dynamically adjusts the airflow according to the working status of the furnace 3, achieving a stable and controllable furnace atmosphere environment. Meanwhile, the control system, through an integrated digital control unit, precisely manages the temperature and atmosphere changes throughout the furnace 3, ensuring that the interior of the furnace 2 always maintains optimal working conditions.

[0028] like Figure 2-4 As shown, the furnace body 2 is provided with a feed inlet 4, and a sealing flange 5 is provided at the feed inlet 4; it also includes a furnace door 13 rotatably mounted on the machine body 1, and the furnace door 13 and the sealing flange 5 are sealed together by a sealing structure 6; the sealing structure 6 includes a sealing groove 61 provided on the periphery of the sealing flange 5, and an electromagnetic component 62 is provided in the sealing groove 61 to make the inner wall of the sealing groove 61 magnetic; it also includes a sealing strip 63 provided on the inner side of the furnace door 13 and corresponding to the shape and position of the sealing groove 61, the sealing strip 63 is elastically deformable and has a fluid cavity 64 inside, and the fluid cavity 64 is filled with magnetic fluid.

[0029] During operation, a fire-resistant brick 12 is installed between the feed inlet 4 and the furnace door 13. The fire-resistant brick 12 can seal the feed inlet 4 of the furnace 3 to ensure a constant internal temperature. The sealing flange 5 is tightly fitted to the inner wall of the furnace door 13 to seal and lock the feed inlet 4. To ensure a good seal, a sealing structure 6 is provided between the sealing flange 5 and the furnace door 13. The sealing structure 6 includes a sealing groove 61, which is located on the periphery of the sealing flange 5. The inner wall of the groove is magnetic due to the magnetic field generated by the electromagnet 11, forming a magnetic fluid seal with the sealing strip 63. The sealing strip 63 is installed on the inner side of the furnace door 13 and is aligned with the shape and position of the sealing groove 61. The sealing strip 63 is made of high-temperature resistant silicone or fluororubber and has good elastic deformation characteristics. It has a closed fluid cavity 64 inside, which is filled with magnetic fluid. Under the action of the electromagnetic component 62, the magnetofluid can flow and adjust, and drive the sealing strip 63 to deform and keep it in contact with the inner wall of the sealing groove 61, thereby enhancing the contact between the sealing strip 63 and the sealing groove 61, thus forming a reliable seal.

[0030] like Figure 6 As shown, the sealing groove 61 has a T-shaped structure. When the end of the sealing strip 63 is compressed, it can deform into the sides of the sealing groove 61. The design of the end of the sealing strip 63 allows it to deform under pressure. The sides of the sealing strip 63 can recess into the sealing groove 61. This elastic deformation helps to enhance the contact between the sealing surface and the sealing groove 61, resulting in stronger sealing performance and preventing gas or atmosphere leakage. After the sealing strip 63 deforms within the sealing groove 61, a snap-fit ​​fit is formed between the sealing strip 63 and the sealing groove 61, preventing loosening or damage under high pressure and high temperature environments. At the same time, the T-shaped groove design improves the stability of the sealing strip 63 under pressure, making the sealing effect more durable.

[0031] like Figure 3-6 As shown, a cooling mechanism 7 is also provided on the sealing strip 63. The cooling mechanism 7 is used to cool the sealing strip 63 and the magnetic fluid inside it. The cooling mechanism 7 includes a cooling cavity 71 located in the middle of the sealing strip 63, and a fluid cavity 64 surrounding the outside of the cooling cavity 71. The cooling cavity 71 is also provided with an inlet pipe 73 and an outlet pipe 72 that pass through the furnace door 13 and are exposed to the outside. Both the inlet pipe 73 and the outlet pipe 72 are connected to a water tank 74. A water pump 75 is provided at the connection between the outlet pipe 72 and the water tank 74. The cooling cavity 71 is located in the middle of the sealing strip 63 and is connected to the external water tank 74 through the inlet pipe 73 and the outlet pipe 72. Through the suction of the pump, cooling water can be delivered to the cooling cavity 71 in a timely manner to cool the sealing strip 63 and the magnetic fluid inside it, and prevent aging or failure caused by overheating. The inlet pipe 73 and outlet pipe 72 are connected to the water tank 74 via the water pump 75 to form a circulating cooling system, which continuously provides cooling for the sealing structure 6, thereby preventing the magnetic fluid from losing magnetism at high temperatures.

[0032] Among them, the water outlet pipe 72 and the water inlet pipe 73 are flexible pipes, so they can deform with the opening and closing of the furnace door 13, thus avoiding interference with the opening and closing of the furnace door 13.

[0033] The fluid cavity 64 and the cooling cavity 71 are matched in shape. After the sealing strip 63 is inserted into the sealing groove 61 and the cooling water in the water tank 74 fills the cooling cavity 71, the cooling water will exert a squeezing force on the outside of the sealing strip 63, thereby further squeezing the sealing strip 63 and making the sealing strip 63 fit more tightly against the inside of the sealing groove 61, further enhancing the sealing effect between the sealing strip 63 and the sealing groove 61.

[0034] A limiting strip 8 is provided on one end face of the sealing strip 63 facing the sealing groove 61. The limiting strip 8 is made of solid and flexible material. A limiting groove is provided at the bottom of the inner wall of the sealing groove 61 to abut against the limiting strip 8. The limiting strip 8 has an arc-shaped cross-section. The limiting strip 8, made of flexible material with an arc-shaped cross-section, is also provided on the end face of the sealing strip 63 to limit excessive deformation of the sealing strip 63 and ensure stable sealing. At the same time, when the cooling chamber 71 is filled with cooling water and the sealing strip expands, the limiting strip 8 will be squeezed and adhered to the limiting groove, thereby further improving the reliability of the sealing effect.

[0035] The sealing flange 5 is a hollow pipe, and the electromagnetic assembly 62 is disposed in the cavity 10 of the sealing flange 5. The electromagnetic assembly 62 includes an electromagnet 11 disposed in the sealing flange 5. The electromagnet 11 is attached to the side wall of the sealing groove 61, and the electromagnet 11 is connected to a power supply connected to the control system.

[0036] The hollow tube-shaped sealing flange 5 has stronger structural strength and stability, and can better seal with the furnace door 13, enhancing the sealing effect. The electromagnetic component 62, by being set inside the cavity 10 of the sealing flange 5, not only saves space, but also allows the electromagnet 11 to act directly on the inner wall of the sealing groove 61, achieving magnetic sealing.

[0037] The coordination between electromagnet 11 and the control system: After electromagnet 11 is connected to the control system, the magnetic field strength of electromagnet 11 can be adjusted in real time, so that the magnetic fluid in the sealing groove 61 can adjust its sealing effect. Through the precise adjustment of the control system, the sealing performance can be flexibly adjusted under different working environments, ensuring good sealing of the atmosphere furnace under extreme temperature and atmosphere conditions.

[0038] Working Principle: During operation, the control system first monitors parameters such as atmosphere, temperature, and pressure within furnace 3 in real time using sensors, and feeds this data back to the PLC control unit. Based on this data, the control unit dynamically adjusts various valves, fans, and other equipment in the gas path system to precisely regulate gas flow and composition, ensuring the stability and precise control of the atmosphere within furnace 3. The gas path system delivers the required gas (such as nitrogen, hydrogen, or other inert gases) into furnace 3 through the inlet pipe and controls the gas flow through gas regulating valves, thereby regulating the atmosphere within furnace 3. This real-time adjustment ensures that the atmosphere furnace can flexibly respond to different operating conditions, maintaining a stable atmosphere within furnace 3 and meeting the needs of various processes.

[0039] The sealing performance of the furnace chamber 3 is equally crucial. The feed inlet 4 of the furnace body 2 and the furnace door 13 are tightly connected and sealed through a sealing flange 5 and a sealing structure 6. A sealing groove 61 is provided between the sealing flange 5 and the furnace door 13. An electromagnetic component 62 generates a magnetic field within the sealing groove 61, controlling the sealing effect between the sealing groove 61 and the sealing strip 63. The sealing strip 63 is filled with a magnetic fluid, which can flow and adjust under the action of the electromagnetic component 62, driving the sealing strip 63 to deform and tightly adhere to the inner wall of the sealing groove 61, thereby enhancing the sealing performance and preventing gas leakage or atmosphere changes. The precise fit of the sealing structure 6 not only ensures the sealing performance of the furnace chamber 3 but also effectively avoids gas or atmosphere leakage, ensuring a stable working environment.

[0040] Furthermore, to prevent the sealing strip 63 and its internal magnetic fluid from failing or aging due to high temperatures, the cooling system is designed to be tightly integrated with the sealing structure 6. A cooling chamber 71 is provided inside the sealing strip 63, connected to an external water tank 74 via an inlet pipe 73 and an outlet pipe 72. Cooling water circulates through a suction pump 75, carrying away heat from the sealing strip 63 and maintaining its stability. The flow of cooling water not only reduces the temperature of the sealing strip 63 but also applies external force to it through the fluid chamber 64, further enhancing the sealing effect. This ensures that the sealing strip 63 can effectively deform at high temperatures and maintain tight contact with the sealing groove 61, preventing seal failure due to high-temperature expansion.

[0041] The core of the entire process is to ensure the stability of the atmosphere within the furnace 3 and the precise control of parameters such as temperature and pressure through the precise collaboration of the gas path system and the control system. Simultaneously, the dynamic adjustment of the furnace body 2's sealing structure 6, cooling system, and electromagnetic components 62 ensures that the furnace body 2 maintains good sealing performance even under high-temperature and high-pressure operating conditions, thereby preventing gas leakage or atmosphere runaway. Through the organic combination of these mechanisms, the entire system ensures atmosphere stability while flexibly responding to different operational needs, guaranteeing the efficient operation and long-term stable functioning of the atmosphere furnace.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vacuum chamber-type atmosphere furnace, comprising a body (1), wherein the body (1) is provided with a furnace body (2) having a furnace chamber (3), a control system, and a gas path system connected to the furnace chamber (3), characterized in that, The furnace body (2) is provided with a feed inlet (4), and a sealing flange (5) is provided at the feed inlet (4); it also includes a furnace door (13) that is rotatably provided on the machine body (1), and the furnace door (13) and the sealing flange (5) are sealed together by a sealing structure (6); the sealing structure (6) includes a sealing groove (61) provided on the periphery of the sealing flange (5), and an electromagnetic component (62) is provided in the sealing groove (61) to make the inner wall of the sealing groove (61) magnetic; it also includes a sealing strip (63) provided on the inner side of the furnace door (13) and corresponding to the shape and position of the sealing groove (61), the sealing strip (63) is elastically deformable and has a fluid cavity (64) inside, and the fluid cavity (64) is filled with magnetic fluid.

2. A vacuum chamber-type atmosphere furnace according to claim 1, characterized in that, The sealing groove (61) has a T-shaped structure, and the end of the sealing strip (63) can deform into the concave sides of the sealing groove (61) after being pressed.

3. A vacuum chamber-type atmosphere furnace according to claim 1 or 2, characterized in that, The sealing strip (63) is also provided with a cooling mechanism (7), which is used to cool the sealing strip (63) and the magnetic fluid inside it.

4. A vacuum chamber-type atmosphere furnace according to claim 3, characterized in that, The cooling mechanism (7) includes a cooling chamber (71) located in the middle of the sealing strip (63), and the fluid chamber (64) is wrapped around the outside of the cooling chamber (71). The cooling chamber (71) is also provided with an inlet pipe (73) and an outlet pipe (72) that pass through the furnace door (13) and are exposed to the outside. The inlet pipe (73) and the outlet pipe (72) are both connected to a water tank (74), and a water pump (75) is provided at the connection between the outlet pipe (72) and the water tank (74).

5. A vacuum box-type atmosphere furnace according to claim 4, characterized in that, The fluid cavity (64) is shaped to match the cooling cavity (71).

6. A vacuum chamber-type atmosphere furnace according to claim 2, characterized in that, The sealing strip (63) has a limiting strip (8) on one end face facing the sealing groove (61). The limiting strip (8) is made of solid material and flexible material. The bottom of the inner wall of the sealing groove (61) is provided with a limiting groove that abuts against the limiting strip (8). The cross-section of the limiting strip (8) is arc-shaped.

7. A vacuum chamber-type atmosphere furnace according to claim 1, characterized in that, The sealing flange (5) is a hollow pipe, and the electromagnetic component (62) is disposed in the cavity (10) of the sealing flange (5).

8. A vacuum chamber-type atmosphere furnace according to claim 7, characterized in that, The electromagnetic assembly (62) includes an electromagnet (11) disposed in the sealing flange (5), the electromagnet (11) fitting against the side wall of the sealing groove (61), and the electromagnet (11) being connected to a power supply connected to the control system.

9. A vacuum chamber-type atmosphere furnace according to claim 1, characterized in that, The sealing strip (63) can be made of high-temperature silicone or fluororubber.

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