Sealing ring for sintering furnace

Abstract

The utility model discloses a sealing ring for a sintering furnace, which comprises a sealing seat, the lower side wall of the sealing seat is fixedly connected with a sealing ring main body, the outer side wall of the sealing ring main body is fixedly connected with three layers of sealing sleeves, and the cross section of each sealing sleeve is triangular; the sealing seat and the sealing ring body are each composed of four layers of materials, and the four layers of materials are sequentially a preliminary sealing layer, a heat insulation sealing layer, a reinforced sealing layer and a wear-resistant sealing layer from outside to inside. Through the multi-layer sealing structure and the heat insulation design, the sealing performance and the heat insulation effect are improved, the service life of the sealing ring is prolonged, meanwhile, the structural stability and adaptability are enhanced, the production cost is reduced, the energy utilization efficiency of a sintering furnace is improved, and the strict requirement of the sintering technology for the sealing environment is met; and efficient and stable operation of the sintering furnace is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of sintering furnace technology, and in particular to a sealing ring for sintering furnaces. Background Technology

[0002] Sintering furnaces, as commonly used thermal equipment, are widely applied in semiconductors, new energy, and materials processing. The sealing performance of their furnace doors directly affects the uniformity of temperature, atmosphere stability, and energy efficiency within the furnace, profoundly impacting product quality and production costs. Traditional sintering furnace doors typically use a single-material sealing ring, such as rubber, asbestos, or metal rings. Their working principle primarily involves using close contact between the sealing ring and the furnace door and body to prevent the exchange of matter and energy between the high-temperature gases inside the furnace and the external environment. Rubber sealing rings, with their good elasticity and flexibility, can conform to the sealing surface to a certain extent, achieving a preliminary seal. Asbestos sealing rings rely on their high-temperature resistance to maintain a basic sealing shape under high-temperature conditions. Metal sealing rings mainly utilize their strength and rigidity to meet the mechanical fastening requirements of the furnace door, maintaining the stability of the sealing structure.

[0003] However, these existing technologies generally suffer from several problems that urgently need to be addressed. On the one hand, sealing rings made of a single material cannot simultaneously meet the diverse performance requirements of high-temperature environments. Rubber sealing rings are prone to accelerated aging at high temperatures, with their elasticity and flexibility significantly decreasing, leading to a rapid decline in sealing performance over time. While asbestos sealing rings have good temperature resistance, their material is relatively brittle and hard, resulting in poor adhesion to the sealing surface. When the furnace door is frequently opened and closed or subjected to mechanical vibration, tiny gaps can easily appear, leading to gas leakage. Metal sealing rings have poor thermal conductivity, failing to effectively prevent heat loss from the furnace, resulting in energy waste and causing thermal stress concentration in the furnace door and surrounding components due to uneven heating, affecting the overall stability and service life of the equipment. On the other hand, the structural design of existing sealing rings is relatively simple, lacking optimized layouts for multi-stage sealing and insulation. A single sealing layer cannot form an effective labyrinthine sealing path, allowing high-temperature gases to easily leak along a straight path, making it difficult to meet the stringent requirements of the sintering process for the furnace's sealing environment. Utility Model Content

[0004] The purpose of this invention is to provide a sealing ring for sintering furnaces that overcomes the shortcomings of existing sealing rings.

[0005] To achieve the above objectives, a sealing ring for a sintering furnace is provided, comprising a sealing seat, a sealing ring body fixedly connected to the lower side wall of the sealing seat, and three sealing sleeves fixedly connected to the outer side wall of the sealing ring body, wherein the cross-section of the sealing sleeves is triangular.

[0006] The sealing seat and the main body of the sealing ring are both composed of four layers of material, which are arranged from the outside to the inside as a preliminary sealing layer, a heat insulation sealing layer, a reinforced sealing layer and a wear-resistant sealing layer.

[0007] According to the sealing ring for a sintering furnace, the sealing seat and the sealing ring body have the same inner diameter, such that the inner sidewalls of the sealing seat and the sealing ring body are set as smooth curved surfaces.

[0008] According to the sealing ring for a sintering furnace, the outer side wall of the sealing ring body is provided with a positioning groove to facilitate the positioning of the sealing ring body.

[0009] According to the sealing ring for a sintering furnace, the three sealing sleeves are arranged in descending order of outer diameter as an upper sealing sleeve, a lower sealing sleeve, and a middle sealing sleeve, thereby forming a tortuous sealing chamber. This requires the medium to undergo multiple turns and compressions during passage, thus greatly reducing the possibility of leakage.

[0010] According to the aforementioned sealing ring for a sintering furnace, the initial sealing layer is made of a flexible material, and the material of the initial sealing layer is set as high-temperature resistant rubber, forming a basic sealing barrier.

[0011] According to the aforementioned sealing ring for a sintering furnace, the heat-insulating sealing layer is made of a high-temperature resistant material, and the material of the heat-insulating sealing layer is set as glass fiber, which effectively prevents heat in the furnace from being conducted outward, reduces the erosion and impact of heat on the sealing ring, lowers the operating temperature of the sealing ring, and extends its service life.

[0012] According to the sealing ring for a sintering furnace, the reinforcing sealing layer is made of a pressure-resistant material, and the material of the reinforcing sealing layer is set as polytetrafluoroethylene, which further improves the sealing effect and also provides support and protection for the outer layer.

[0013] According to the aforementioned sealing ring for a sintering furnace, the wear-resistant sealing layer is made of wear-resistant and corrosion-resistant material. The material of the wear-resistant sealing layer is set as reinforced fluororubber, which can better fit the sealing surface when the handle is tightened to close the furnace door, achieving a good sealing effect, and can also resist external friction and collision, protecting the internal sealing structure.

[0014] This utility model has the following beneficial effects:

[0015] 1. Compared with existing technologies, the sealing ring of this utility model adopts a multi-layer sealing structure. The initial sealing layer is made of high-temperature resistant rubber, which can fit tightly with the sealing surface to form a basic sealing barrier. The reinforcing sealing layer is made of polytetrafluoroethylene, which further improves the sealing effect and provides support and protection for the outer layer. The outer layer of reinforced fluororubber wear-resistant sealing layer fits the sealing surface better when the furnace door is closed, achieving a good sealing effect. The outer diameters of the three sealing sleeves are arranged in descending order to form a tortuous sealing chamber, which forces the medium to change direction and compress multiple times when attempting to leak, significantly reducing the possibility of leakage and ensuring a stable atmosphere inside the furnace.

[0016] 2. Compared with existing technologies, the heat insulation sealing layer uses glass fiber material. Its porous structure effectively blocks heat conduction from the furnace to the outside, reducing the erosion and impact of heat on the internal structure of the sealing ring and lowering the operating temperature of the sealing ring. This not only slows down the aging process of the material and extends the service life of the sealing ring, but also improves the energy utilization efficiency of the sintering furnace, reduces energy waste, and lowers production costs. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0018] Figure 1 This is a schematic diagram of the structure of a sealing ring for a sintering furnace according to the present invention;

[0019] Figure 2 This is a front view of a sealing ring for a sintering furnace according to the present invention.

[0020] Figure 3 This is a bottom schematic diagram of a sealing ring for a sintering furnace according to the present invention;

[0021] Figure 4 This is a cross-sectional schematic diagram of a sealing ring for a sintering furnace according to the present invention.

[0022] Legend:

[0023] 1. Sealing seat; 2. Sealing ring body; 201. Positioning groove; 3. Sealing sleeve; 4. Preliminary sealing layer; 5. Heat insulation sealing layer; 6. Reinforced sealing layer; 7. Wear-resistant sealing layer. Detailed Implementation

[0024] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0025] Reference Figure 1-4This utility model provides a sealing ring for a sintering furnace, which includes a sealing seat 1. A sealing ring body 2 is fixedly connected to the lower side wall of the sealing seat 1. The inner diameters of the sealing seat 1 and the sealing ring body 2 are the same, so that the inner side walls of the sealing seat 1 and the sealing ring body 2 are set as smooth curved surfaces. A positioning groove 201 is provided on the outer side wall of the sealing ring body 2 to facilitate the positioning of the sealing ring body 2.

[0026] Three sealing sleeves 3 are fixedly connected to the outer wall of the sealing ring body 2. The cross-section of the sealing sleeve 3 is set as a triangle. The outer diameter of the three sealing sleeves 3 is arranged from large to small as the upper sealing sleeve 3, the lower sealing sleeve 3, and the middle sealing sleeve 3, thus forming a tortuous sealing chamber. This requires the medium to undergo multiple turns and compressions when passing through, thereby greatly reducing the possibility of leakage.

[0027] Both the sealing seat 1 and the sealing ring body 2 are composed of four layers of material. From the outside to the inside, the four layers are arranged as follows: preliminary sealing layer 4, heat insulation sealing layer 5, reinforced sealing layer 6, and wear-resistant sealing layer 7. The preliminary sealing layer 4 is made of flexible material and is made of high-temperature resistant rubber to form a basic sealing barrier. The heat insulation sealing layer 5 is made of high-temperature resistant material and is made of glass fiber, which effectively prevents heat from the furnace from being conducted outward, reduces the erosion and impact of heat on the sealing ring, lowers the working temperature of the sealing ring, and extends its service life. The reinforced sealing layer 6 is made of pressure-resistant material and is made of polytetrafluoroethylene, which further improves the sealing effect and also provides support and protection for the outer layer. The wear-resistant sealing layer 7 is made of wear-resistant and corrosion-resistant material and is made of reinforced fluororubber. When the handle is tightened and the furnace door is closed, it can better fit the sealing surface to achieve a good sealing effect and resist external friction and collision, protecting the internal sealing structure.

[0028] Working Principle: When the sintering furnace door is closed, the sealing ring is compressed between the furnace door and the furnace body. The initial sealing layer 4 first contacts the furnace body, using its elastic deformation to fill the tiny gaps in the sealing surface, forming the first sealing barrier to prevent gas leakage from the furnace. As the furnace door is further tightened, the heat-insulating sealing layer 5 plays a heat-insulating role. Its glass fiber material can effectively block the high-temperature heat inside the furnace from being conducted to the outside, reducing the overall working temperature of the sealing ring, slowing down material aging, and extending the service life of the sealing ring. At the same time, the polytetrafluoroethylene material of the reinforcing sealing layer 6 provides support for the sealing ring and enhances the sealing effect under pressure, preventing seal failure due to pressure changes. The innermost wear-resistant sealing layer 7, during the opening and closing of the furnace door, resists mechanical damage and chemical damage due to the wear-resistant and corrosion-resistant properties of the reinforced fluororubber. To prevent corrosion and protect the internal structure of the sealing ring, the special design of the three-layer sealing sleeve 3 forms a tortuous sealing path during the sintering process. When high-temperature gas attempts to leak, it needs to undergo multiple turns and compressions, passing sequentially through the upper, middle, and lower sealing sleeves with decreasing outer diameters. This labyrinthine structure greatly increases the resistance to gas leakage, reduces the possibility of leakage, ensures a stable atmosphere inside the furnace, and meets the stringent requirements of the sintering process for a sealed environment. The positioning groove 201 of the sealing ring body 2 cooperates with the positioning device on the furnace door to ensure accurate installation of the sealing ring and avoid incomplete sealing due to misalignment. The sealing seat 1 has the same inner diameter as the sealing ring body 2 and a smooth inner wall, allowing the sealing ring to fit evenly against the furnace door and furnace body contact surfaces, further improving sealing reliability and ensuring the efficient and stable operation of the sintering furnace.

[0029] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A sealing ring for a sintering furnace, characterized in that, Includes a sealing seat (1), the lower side wall of the sealing seat (1) is fixedly connected to a sealing ring body (2), the outer side wall of the sealing ring body (2) is fixedly connected to a three-layer sealing sleeve (3), and the cross-section of the sealing sleeve (3) is set as a triangle; The sealing seat (1) and the sealing ring body (2) are both composed of four layers of material, which are arranged from the outside to the inside as a preliminary sealing layer (4), a heat insulation sealing layer (5), a reinforced sealing layer (6), and a wear-resistant sealing layer (7).

2. A sealing ring for a sintering furnace according to claim 1, characterized in that, The sealing seat (1) and the sealing ring body (2) have the same inner diameter.

3. A sealing ring for a sintering furnace according to claim 1, characterized in that, The outer wall of the sealing ring body (2) is provided with a positioning groove (201).

4. A sealing ring for a sintering furnace according to claim 1, characterized in that, The three sealing sleeves (3) are arranged in descending order of their outer diameter as upper sealing sleeve (3), lower sealing sleeve (3), and middle sealing sleeve (3).

5. A sealing ring for a sintering furnace according to claim 1, characterized in that, The initial sealing layer (4) is made of a flexible material, and the material of the initial sealing layer (4) is set as high temperature resistant rubber.

6. A sealing ring for a sintering furnace according to claim 1, characterized in that, The heat insulation sealing layer (5) is made of high temperature resistant material, and the material of the heat insulation sealing layer (5) is glass fiber.

7. A sealing ring for a sintering furnace according to claim 1, characterized in that, The reinforcing sealing layer (6) is made of a pressure-resistant material, and the material of the reinforcing sealing layer (6) is polytetrafluoroethylene.

8. A sealing ring for a sintering furnace according to claim 1, characterized in that, The wear-resistant sealing layer (7) is made of wear-resistant and corrosion-resistant material, and the material of the wear-resistant sealing layer (7) is set as reinforced fluororubber.

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