Tubular furnace with good sealing performance

Abstract

The utility model provides a tubular furnace with good sealing performance, which comprises a furnace body, a hearth is arranged in the furnace body, the hearth is connected with a furnace tube, and the furnace tube penetrates out of two ends of the furnace body. And two ends of the furnace tube are respectively connected with sealing covers and are provided with guide wheels. The furnace tube is a quartz tube, and atmosphere is introduced into the furnace tube or vacuumizing is carried out in the sintering process. Sintered fibers penetrate into the furnace tube from the sealing cover and penetrate out of the sealing cover at the other end of the furnace tube, in the fiber sintering and conveying process, the guide wheels guide the fibers to enter the furnace tube, sliding friction borne by the fibers is converted into rolling friction, friction resistance borne by fiber materials in the conveying process is reduced, and the fiber tensile strength is improved; the mechanical wear of the fiber material is reduced and the mechanical strength is improved.

Description

Technical Field

[0001] This utility model belongs to the field of tube furnace technology, specifically relating to a tube furnace with good sealing performance. Background Technology

[0002] To improve the mechanical properties or surface characteristics of limiting materials, high-temperature treatment is typically employed, involving high-temperature sintering of fibers in a tube furnace. The fiber structure is stabilized by controlling the temperature and residence time. Different atmospheres are required in the tube furnace depending on the process to ensure sintering occurs under specific conditions. Furthermore, harmful gases are generated during production; leaks of these gases can easily lead to poisoning or even explosions. Existing tube furnaces often have poor sealing, resulting in heat loss, reduced thermal efficiency, and increased energy consumption.

[0003] Therefore, the above problems urgently need to be solved. Utility Model Content

[0004] Purpose of the utility model: In order to overcome the above shortcomings, this utility model provides a tube furnace with good sealing performance, which is equipped with multi-stage mechanical seals to improve the sealing performance of the furnace tubes, reduce external interference, improve sintering quality, reduce heat loss, and improve thermal efficiency.

[0005] Technical Solution: To achieve the above objectives, this utility model provides a tubular furnace with good sealing performance, including a furnace body, a furnace chamber inside the furnace body, and a furnace tube connected to the furnace chamber, the furnace tube extending from both ends of the furnace body. Sealing caps are connected to both ends of the furnace tube, and guide wheels are provided at both ends of the furnace tube. The furnace tube is a quartz tube, and an atmosphere is introduced or a vacuum is drawn inside the furnace tube during the sintering process. This utility model allows sintered fibers to pass through the sealing cap into the furnace tube and out through the sealing cap at the other end of the furnace tube. During fiber sintering and transport, the guide wheels guide the fibers into the furnace tube, converting the sliding friction experienced by the fibers into rolling friction, reducing the frictional resistance encountered during fiber material transport, improving fiber tensile strength, reducing mechanical wear of the fiber material, and improving mechanical strength.

[0006] Furthermore, in the aforementioned tubular furnace with good sealing performance, the sealing cover includes a pressure ring, a sealing ring, and an end cap. The pressure ring is fitted onto the outside of the furnace tube. The end cap abuts against one end of the furnace tube, and a limiting groove is provided at the abutment end of the end cap and the furnace tube. The furnace tube is snapped into the limiting groove, and the end cap and the pressure ring are connected by fasteners. Near the end cap, the pressure ring has a pressing bevel extending outwards from the end cap. Threaded holes are provided on the sidewall of the pressure ring, arranged in an array along the outer circumference of the pressure ring, and set screws are threaded into the threaded holes. The sealing ring is connected to the outside of the furnace tube, and the pressing bevel compresses the sealing ring, forming a seal. The pressure ring is connected to one end of the furnace tube via set screws. The pressing bevel compresses the sealing ring, causing deformation of the sealing ring and creating sealing pressure, ensuring the sealing performance of the sealing cover and the furnace tube. The limiting groove improves the positioning accuracy of the furnace tube, preventing furnace tube misalignment and affecting sintering quality. The sealing ring is preferably made of graphite-based composite material.

[0007] Furthermore, in the aforementioned tubular furnace with good sealing performance, a nozzle is threadedly connected to the end cap, and a short pipe is threadedly connected to the end of the nozzle furthest from the end cap, forming a threaded passage. A first stepped portion is provided at the end of the nozzle near the end cap, and a first sealing gasket is fitted onto this first stepped portion. The first stepped portion compresses the first sealing gasket, connecting it to the outside of the furnace body to form a seal. Two or more first sealing gaskets are provided. The preferred material for the first sealing gaskets is polytetrafluoroethylene (PTFE). The nozzle is threadedly connected to the end cap; rotating the nozzle causes the first stepped portion to compress the first sealing gasket, forming a seal between the nozzle and the end cap, thus improving the sealing performance.

[0008] Furthermore, in the aforementioned tubular furnace with good sealing performance, the end of the nozzle extending into the furnace tube is designed as a flared opening, and the end of the nozzle connected to the short tube is designed as a stepped hole, with the short tube threaded into the stepped hole. A second stepped portion is provided within the stepped hole, and a ceramic eye is connected to the second stepped portion. A second sealing gasket is connected between the ceramic eye and the short tube. The short tube compresses the second sealing gasket, forming a seal. The ceramic eye material is preferably a high-temperature resistant ceramic material. The short tube compresses the second sealing gasket, forming a mechanical compression seal, thus improving the sealing performance.

[0009] Furthermore, in the aforementioned tubular furnace with good sealing performance, the ceramic eye is designed as a hollow cylinder with a T-shaped cross-section. A third sealing gasket is installed around the ceramic eye, and the ceramic eye wings compress the third sealing gasket to form a seal. The second and third sealing gaskets form a multi-stage seal, improving the sealing performance and effectively preventing outside air or furnace tubes from entering the furnace tubes, ensuring the sealing effect and improving the sintering quality.

[0010] Furthermore, in the aforementioned tube furnace with good sealing performance, the end of the short tube furthest from the nozzle is designed as a flared opening. This flared opening reduces friction between the fiber and the short tube, minimizing mechanical damage and improving fiber sintering quality.

[0011] Furthermore, in the aforementioned tubular furnace with good sealing performance, the end cap is connected to a connector, which is connected to a gas pipe. Gas is introduced into the furnace tube through the connector, allowing for rapid switching of the gas supply to meet the requirements of different sintering processes.

[0012] Furthermore, in the aforementioned tubular furnace with good sealing properties, the furnace chamber is surrounded by a high-temperature resistant material, which is a lightweight silicate block. Lightweight silicate blocks heat up quickly, have low density, and can reduce weight.

[0013] Furthermore, in the aforementioned tubular furnace with good sealing performance, a heating tube is installed inside the furnace chamber, and the heating tube is a quartz heating tube. The quartz heating tube heats through infrared radiation, and combined with the temperature detection installed inside the furnace chamber, the sintering temperature can be dynamically adjusted to meet process requirements.

[0014] Furthermore, in the aforementioned tubular furnace with good sealing performance, there are two or more furnace tubes arranged parallel to each other from top to bottom. Having multiple furnace tubes allows fibers to be inserted into multiple tubes simultaneously, and also allows the fiber direction to be changed via guide wheels, enabling fibers to pass through multiple tubes sequentially from top to bottom, thus shortening the length of the tubular furnace and saving equipment space.

[0015] As can be seen from the above technical solution, this utility model has the following beneficial effects: The tubular furnace of this utility model has good sealing performance. Guide wheels are set to guide the fibers into the furnace tube, converting the sliding friction experienced by the fibers into rolling friction, reducing the frictional resistance encountered during fiber material transportation, improving fiber tensile strength, reducing mechanical wear of the fiber material, and improving mechanical strength. Multi-stage sealing improves the sealing performance of the furnace tube, reduces external interference, improves sintering quality, reduces heat loss, improves thermal efficiency, and reduces energy consumption. Attached Figure Description

[0016] Figure 1 This is a front view of the tubular furnace with good sealing performance according to this utility model;

[0017] Figure 2 This is a cross-sectional view of the tubular furnace with good sealing performance according to this utility model;

[0018] Figure 3 for Figure 1 A magnified view of a portion of the image;

[0019] Figure 4 Here is an exploded view of the sealing cap;

[0020] Figure 5 for Figure 3 A magnified view of a portion of the image.

[0021] In the diagram: 1. Furnace body, 2. Furnace chamber, 3. Furnace tube, 4. Sealing cap, 41. Pressure ring, 411. Extrusion bevel, 412. Threaded hole, 42. Sealing ring, 43. End cap, 431. Limiting groove, 44. Nozzle, 441. First step, 442. Stepped hole, 4421. Second step, 45. Short tube, 46. Threading channel, 47. First sealing gasket, 48. Ceramic eye, 49. Second sealing gasket, 50. Third sealing gasket, 51. Connector, 5. Guide wheel, 6. Heating tube. Detailed Implementation

[0022] Example 1

[0023] like Figure 1-2 The diagram shows a tubular furnace with good sealing performance, comprising a furnace body 1, a furnace chamber 2 inside the furnace body 1, and a furnace tube 3 connected to the furnace chamber 2, the furnace tube 3 extending from both ends of the furnace body 1. Sealing caps 4 are connected to both ends of the furnace tube 3, and guide wheels 5 are provided at both ends of the furnace tube 3. The furnace tube 3 is a quartz tube, and during the sintering process, an atmosphere is introduced into the furnace tube 3 or a vacuum is drawn.

[0024] In this embodiment, the furnace chamber 2 is surrounded by a high-temperature resistant material, which is a lightweight silicate block.

[0025] In this example, the furnace chamber 2 is equipped with a heating tube 6, which is a quartz heating tube. The quartz heating tube heats through infrared radiation, and combined with the temperature detection inside the furnace chamber 2, the sintering temperature can be dynamically adjusted to meet the process requirements.

[0026] In this embodiment, there are two or more furnace tubes 3, which are arranged parallel to each other from top to bottom. Having multiple furnace tubes 3 allows fibers to be inserted into multiple tubes simultaneously, and the fiber direction can be changed by the guide wheel 5, allowing the fibers to pass through multiple tubes sequentially from top to bottom, thus shortening the length of the tubular furnace and saving equipment space.

[0027] like Figure 3-4 The tubular furnace shown has good sealing performance. The sealing cover 4 includes a pressure ring 41, a sealing ring 42, and an end cap 43. The pressure ring 41 is sleeved on the outside of the furnace tube 3. The end cap 43 abuts against one end of the furnace tube 3. The end cap 43 and the furnace tube 3 have a limiting groove 431 at the abutting end. The furnace tube 3 is snapped into the limiting groove 431. The end cap 43 and the pressure ring 41 are connected by fasteners. The pressure ring 41 has a pressing bevel 411 extending outward from the end cap 43 near the end cap 43. The side wall of the pressure ring 41 has threaded holes 412, which are arranged in an array along the outer circumference of the pressure ring 41. The threaded holes 412 are internally threaded with set screws. The sealing ring 42 is connected to the outside of the furnace tube 3. The pressing bevel 411 compresses the sealing ring 42 to form a seal.

[0028] In this embodiment, a nozzle 44 is threadedly connected to the end cap 43, and a short pipe 45 is threadedly connected to the end of the nozzle 44 away from the end cap 43. The nozzle 44 and the short pipe 45 are connected to form a wire passage 46. A first stepped portion 441 is provided at the end of the nozzle 44 near the end cap 43. A first sealing gasket 47 is fitted onto the first stepped portion 441. The first stepped portion 441 compresses the first sealing gasket 47 and connects it to the outside of the furnace body 1, forming a seal. Two or more first sealing gaskets 47 are provided. The material of the first sealing gasket 47 is preferably polytetrafluoroethylene (PTFE). The nozzle 44 is threadedly connected to the end cap 43. Rotating the nozzle 44 causes the first stepped portion 441 to compress the first sealing gasket 47, forming a seal between the nozzle 44 and the end cap 43, thus improving the sealing performance.

[0029] In this embodiment, the end cap 43 is connected to a connector 51, which is connected to a gas pipe. Gas is introduced into the furnace tube 3 through the connector 51, allowing for rapid switching of the introduced gas to meet the requirements of different sintering processes.

[0030] like Figure 5 The tubular furnace shown has good sealing performance. One end of the nozzle 44, which extends into the furnace tube 3, is flared. The end of the nozzle 44 connected to the short tube 45 has a stepped hole 442, and the short tube 45 is threaded into the stepped hole 442. A second step 4421 is provided within the stepped hole 442, and a ceramic eye 48 is connected to the second step 4421. A second sealing gasket 49 connects the ceramic eye 48 and the short tube 45. The short tube 45 compresses the second sealing gasket 49 to form a seal. The ceramic eye 48 is preferably made of high-temperature resistant ceramic material. The short tube 45 compresses the second sealing gasket 49 to form a mechanical compression seal, improving the sealing performance.

[0031] In this embodiment, the ceramic eye 48 is a hollow cylindrical body with a T-shaped cross-section. A third sealing gasket 50 is fitted over the ceramic eye 48, and the wings of the ceramic eye 48 compress the third sealing gasket 50 to form a seal. The through hole and the limiting diameter in the middle of the ceramic eye 48 are correspondingly set. When the fiber passes through the through hole of the ceramic eye 48, the through hole of the limiting component of the ceramic eye 48 is blocked, reducing gas leakage. The second sealing gasket 49 and the third sealing gasket 50 form a multi-stage seal, improving the sealing performance and effectively preventing outside air or furnace tubes from entering the furnace tube 3, ensuring the sealing effect and improving the sintering quality.

[0032] In this embodiment, the end of the short tube 45 furthest from the nozzle 44 is configured as a flared opening.

[0033] In this embodiment, the pressure ring 41 and the sealing ring 42 are connected to the outside of the furnace tube 3, and the end cap 43 is connected to one end of the furnace tube 3. The furnace tube 3 abuts against the limiting groove 431. The set screw in the threaded hole 412 is tightened to connect the pressure ring 41 and the furnace tube 3. Fasteners are used to connect the end cap 43 and the pressure ring 41. The sealing ring 42 is squeezed by the compression slope 411, and the sealing ring 42 deforms to form a seal. The third sealing gasket 50 is fitted onto the outside of the ceramic eye 48. The ceramic eye 48 is placed into the bottom of the stepped hole 442 provided in the nozzle 44. The second sealing gasket 49 is placed into the second stepped part 4421, and the second sealing gasket 49 abuts against the ceramic eye 48. The short tube 45 is screwed into the stepped hole 442. The short tube 45 squeezes the second sealing gasket 49, the second sealing gasket 49 squeezes the ceramic eye 48, and the ceramic eye 48 squeezes the third sealing gasket 50 to form a double seal. The first sealing gasket 47 is fitted onto the first stepped portion 441, and the nozzle 44 is screwed into the end cap 43. The first stepped portion 441 compresses the first sealing gasket 47, forming a triple seal. The connector 51 is threaded and sealed to the end cap 43, and the gas pipe is connected to the connector 51. During production, atmosphere is introduced into the furnace tube 3 through one end connector 51 to expel oxygen from the furnace tube 3. The guide wheel 5, which is limited around one end of the uppermost furnace tube 3, passes through the threading channel 46 into the furnace tube 3, and exits through the threading channel 46 at the other end. It then passes through the guide wheel 5 at the other end and is introduced into the lower furnace tube 3. This process is repeated, and the fiber passes through multiple furnace tubes 3 in a folded serpentine shape before exiting. The heating tube 6 in the furnace chamber 2 heats and sinters the fiber.

[0034] The above embodiments are exemplary and are intended to illustrate the technical concept and features of this utility model, so that those skilled in the art can understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A tube furnace with good sealing performance, characterized in that: The furnace includes a furnace body (1), a furnace chamber (2) is provided inside the furnace body (1), a furnace tube (3) is connected to the furnace chamber (2), and the furnace tube (3) extends out from both ends of the furnace body (1); a sealing cap (4) is connected to both ends of the furnace tube (3), and a guide wheel (5) is provided at both ends of the furnace tube (3).

2. The tubular furnace with good sealing performance according to claim 1, characterized in that: The sealing cap (4) includes a pressure ring (41), a sealing ring (42), and an end cap (43). The pressure ring (41) is sleeved on the outside of the furnace tube (3). The end cap (43) abuts against one end of the furnace tube (3). The end cap (43) and the furnace tube (3) abut against each other and are provided with a limiting groove (431). The furnace tube (3) is snapped into the limiting groove (431). The end cap (43) and the pressure ring (41) are connected by fasteners. The pressure ring (41) The end near the end cap (43) is provided with an extrusion slope (411) extending outward from the end cap (43). The side wall of the pressure ring (41) is provided with a threaded hole (412). The threaded holes (412) are arranged in an array along the outer periphery of the pressure ring (41). The threaded hole (412) is connected to a set screw by an internal thread. The sealing ring (42) is connected to the outside of the furnace tube (3). The extrusion slope (411) extrudes the sealing ring (42) to form a seal.

3. The tubular furnace with good sealing performance according to claim 2, characterized in that: The end cap (43) is threaded with a nozzle (44), and the end of the nozzle (44) away from the end cap (43) is threaded with a short pipe (45). The nozzle (44) and the short pipe (45) are connected to form a wire passage (46). The end of the nozzle (44) near the end cap (43) is provided with a first step (441). The first step (441) is fitted with a first sealing gasket (47). The first step (441) squeezes the first sealing gasket (47) to connect to the outside of the furnace body (1) to form a seal.

4. The tubular furnace with good sealing performance according to claim 3, characterized in that: The nozzle (44) extends into the furnace tube (3) and is provided with a flared mouth at one end. The nozzle (44) is connected to a short tube (45) and is provided with a stepped hole (442) at one end. The short tube (45) is threaded into the stepped hole (442). A second stepped part (4421) is provided in the stepped hole (442). A porcelain eye (48) is connected to the second stepped part (4421). A second sealing gasket (49) is connected between the porcelain eye (48) and the short tube (45). The short tube (45) squeezes the second sealing gasket (49) to form a seal.

5. The tubular furnace with good sealing performance according to claim 4, characterized in that: The ceramic eye (48) is a hollow cylinder with a T-shaped cross-section. The ceramic eye (48) is fitted with a third sealing gasket (50), and the wings of the ceramic eye (48) press against the third sealing gasket (50) to form a seal.

6. The tube furnace with good sealing performance according to claim 3, characterized in that: The end of the short tube (45) away from the nozzle (44) is set as a flared mouth.

7. The tube furnace with good sealing performance according to claim 2, characterized in that: The end cap (43) is connected to a connector (51), which is connected to an air tube.

8. The tubular furnace with good sealing performance according to claim 1, characterized in that: The furnace chamber (2) is surrounded by a high-temperature resistant material, which is a lightweight silicate block.

9. The tube furnace with good sealing performance according to claim 1, characterized in that: The furnace chamber (2) is equipped with a heating tube (6), which is a quartz heating tube.

10. The tube furnace with good sealing performance according to claim 1, characterized in that: The furnace tube (3) has two or more tubes, which are arranged in parallel from top to bottom.

Images