Double-seal leak-proof structure of sleeve furnace rotary joint

Abstract

The utility model relates to metallurgy, chemical equipment sealing connection technical field, concretely is sleeve furnace rotary joint double -sealed leakproof structure, including static pipe and rotating pipe, and the integrated connection pipe that goes into the inside of static pipe is formed on rotating pipe, and one sealed bearing is installed on the inner ring wall of connection pipe, and the integrated connection ring that is connected with sealed bearing is formed in static pipe. The utility model discloses a sealed bearing is arranged on the inner ring wall of the connection pipe of rotating pipe, and the interference fit of its outer ring and connection pipe, inner ring and static pipe connection ring forms first heavy sealing, and the structure of the annular sealing groove is set up simultaneously in the outer ring wall of connection pipe, and the sealing convex ring of cooperation outer sealing pipe forms second heavy rotary seal, and the leakproof performance of rotary joint is improved significantly in double -sealed structure, the threaded connection mode of outer sealing pipe and static pipe, the close adhesion of sealed convex ring and annular sealing groove is guaranteed, and it is convenient to install and maintain, realizes the reliable sealing when static pipe and rotating pipe relatively rotate.

Description

Technical Field

[0001] This utility model relates to the field of sealing connection technology for metallurgical and chemical equipment, specifically a double-seal leak-proof structure for a rotary joint of a sleeve furnace. Background Technology

[0002] In industrial production processes such as metallurgy and chemical engineering, sleeve furnaces are widely used as important heating equipment in processes such as material drying, calcination, and roasting. During operation, the furnace body rotates continuously, requiring a rotary joint to transport external fluid media (such as high-temperature steam, heat transfer oil, compressed air, etc.) into the rotating furnace body to control the heating or reaction process of the materials. However, traditional sleeve furnace rotary joints have many shortcomings in their sealing structure design.

[0003] On the one hand, existing rotary joints mostly use a single sealing structure, such as relying solely on rubber sealing rings or simple mechanical seals. Under the complex operating conditions of long-term high-speed rotation, high temperature and high pressure in a sleeve furnace, the sealing components are prone to wear, aging or deformation, leading to seal failure and subsequent fluid leakage. Fluid leakage not only causes energy waste and material loss, but may also lead to safety accidents.

[0004] On the other hand, traditional rotary joints are inconvenient to install and maintain. An unreasonable sealing structure design makes it difficult to ensure precise positioning and tight fit of the sealing components during installation, easily leading to reduced sealing performance due to assembly deviations. Furthermore, when sealing components are damaged and need replacement, the disassembly process is cumbersome, consuming significant time and labor costs, severely impacting the continuous production efficiency of the sleeve furnace.

[0005] In view of this, we propose a double-seal leak-proof structure for the rotary joint of the sleeve furnace. Utility Model Content

[0006] To overcome the above deficiencies, this utility model provides a double-sealed leak-proof structure for the rotary joint of the sleeve furnace.

[0007] The technical solution of this utility model is:

[0008] The rotary joint of the sleeve furnace has a double-sealed leak-proof structure, including a stationary tube and a rotating tube. A connecting tube is integrally formed on the rotating tube, extending into the interior of the stationary tube. A sealing bearing is installed on the inner ring wall of the connecting tube. A connecting ring, connected to the sealing bearing, is integrally formed inside the stationary tube. The outer ring of the sealing bearing is interference-fitted with the inner ring wall of the connecting tube, and the inner ring is interference-fitted with the outer circumference of the connecting ring. An outer sealing tube is rotatably installed on the outer ring wall of the connecting tube and threadedly connected to the inner wall of the stationary tube. Several annular sealing grooves are formed on the outer circumference of the connecting tube. A sealing convex ring, rotatably connected to the annular sealing grooves, is integrally formed on the inner ring wall of the outer sealing tube, and the sealing convex ring fits tightly against the annular sealing grooves. By installing a sealing bearing on the inner ring wall of the connecting pipe of the rotating pipe, the first layer of seal is formed by the interference fit between its outer ring and the connecting pipe, and the inner ring and the connecting ring of the stationary pipe. At the same time, a structure with an annular sealing groove is set on the outer ring wall of the connecting pipe, which, together with the sealing convex ring of the outer sealing pipe, forms a second layer of rotational seal. The double sealing structure significantly improves the leakage prevention performance of the rotary joint. The threaded connection between the outer sealing pipe and the stationary pipe ensures a tight fit between the sealing convex ring and the annular sealing groove, and facilitates installation and maintenance, thus achieving a reliable seal when the stationary pipe and the rotating pipe rotate relative to each other.

[0009] As a preferred technical solution, an inner extension ring is integrally formed on the inner ring wall of the stationary tube, extending into the interior of the connecting tube, and the connecting ring is integrally formed with the inner extension ring. The inner extension ring enhances the tightness between the interior of the stationary tube and the inner ring wall of the connecting tube, while also providing a means for the installation of the connecting ring.

[0010] As a preferred technical solution, an annular mounting groove is formed inside the stationary tube on the outer side of the inner extension ring, and both the connecting tube and the outer sealing tube are installed in the annular mounting groove. The annular mounting groove inside the stationary tube provides precise installation and positioning space for the connecting tube and the outer sealing tube, ensuring their coaxiality during assembly and reducing sealing failure caused by assembly deviations; the annular mounting groove forms a wrapping restraint for the connecting tube and the outer sealing tube, which can buffer the impact of external vibration on the sealing structure under rotation conditions, maintain the fitting accuracy between the sealing convex ring and the annular sealing groove, and ensure the stability of sealing performance.

[0011] As a preferred technical solution, the inner extension ring is in close contact with the sealing bearing at one end, which can provide axial positioning and support for the sealing bearing and prevent it from moving axially during rotation, thus affecting the sealing effect. The outer circumference of the inner extension ring is in close contact with the inner wall of the connecting pipe, forming an auxiliary seal on the inner side of the sealing bearing, which further extends the fluid leakage path. The tightness of the inner seal is enhanced through multiple contact cooperation, thereby improving the overall leak-proof capability.

[0012] As a preferred technical solution, when the outer sealing tube is fully screwed into the stationary tube, the outer end of the outer sealing tube and the outer end of the connecting tube are flush with the outer side of the stationary tube, making the end structure of the rotary joint flat. Two drive grooves are symmetrically opened on the outer end of the outer sealing tube. The two drive grooves on the outer end of the outer sealing tube facilitate tool operation, making the installation and disassembly of the outer sealing tube more convenient and labor-saving.

[0013] As a preferred technical solution, an outer sealing sleeve is threadedly connected to the outer wall of the stationary tube near the end of the rotating tube. The inner ring of the outer sealing sleeve fits tightly against the outer wall of the rotating tube, forming a third seal on the outside of the rotating joint. This can block trace amounts of fluid that may leak from the inner sealing structure, thus forming multiple layers of protection.

[0014] As a preferred technical solution, when the outer sealing sleeve is tightened onto the stationary pipe, its inner wall fits tightly against the end of the stationary pipe, the end of the outer sealing pipe, and the end of the connecting pipe. This completely covers the end gap of the rotary joint, forming a comprehensive external seal that effectively prevents fluid leakage from the connection gaps between components. This fully fitted structure also creates an axial clamping force on the internal sealing assembly, maintaining a tight fit between the inner and outer sealing structures and ensuring the durability and reliability of the sealing performance under rotation and vibration conditions.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention features a sealing bearing installed on the inner ring wall of the connecting pipe of the rotating pipe. The first layer of seal is formed by the interference fit between the outer ring of the bearing and the connecting pipe, and the inner ring of the bearing and the connecting ring of the stationary pipe. Simultaneously, a structure with an annular sealing groove is provided on the outer ring wall of the connecting pipe, which, together with the sealing convex ring of the outer sealing pipe, forms a second layer of rotational seal. This double sealing structure significantly improves the leak-proof performance of the rotary joint. The threaded connection between the outer sealing pipe and the stationary pipe ensures a tight fit between the sealing convex ring and the annular sealing groove, while also facilitating installation and maintenance, thus achieving a reliable seal when the stationary pipe and the rotating pipe rotate relative to each other. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 In this utility model Figure 1 Internal structure diagram;

[0019] Figure 3 This is a schematic diagram of the structure of the rotating tube, connecting tube, and outer sealing tube in this utility model;

[0020] Figure 4 In this utility model Figure 2 Enlarged view of point A in the image;

[0021] The meanings of the labels in the diagram are as follows:

[0022] 1. Stationary tube; 10. Annular mounting groove; 11. Inner extension ring; 12. Connecting ring; 2. Rotating tube; 20. Sealed bearing; 21. Outer sealing tube; 210. Sealing convex ring; 211. Drive groove; 22. Connecting tube; 220. Annular sealing groove; 3. Outer sealing sleeve. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-4 This utility model provides a technical solution:

[0025] The rotary joint of the sleeve furnace has a double-sealed leak-proof structure, including a stationary tube 1 and a rotating tube 2. A connecting tube 22 is integrally formed on the rotating tube 2 and extends into the interior of the stationary tube 1. A sealing bearing 20 is installed on the inner ring wall of the connecting tube 22. A connecting ring 12 connected to the sealing bearing 20 is integrally formed inside the stationary tube 1. The outer ring of the sealing bearing 20 is interference-fitted with the inner ring wall of the connecting tube 22, and the inner ring is interference-fitted with the outer circumference of the connecting ring 12. An outer sealing tube 21 is rotatably installed on the outer ring wall of the connecting tube 22. The outer sealing tube 21 is threadedly connected to the inner wall of the stationary tube 1. Several annular sealing grooves 220 are opened on the outer circumference of the connecting tube 22. A sealing convex ring 210 is integrally formed on the inner ring wall of the outer sealing tube 21 and rotatably connected to the annular sealing grooves 220. The sealing convex ring 210 and the annular sealing grooves 220 are tightly fitted. By setting a sealing bearing 20 on the inner ring wall of the connecting pipe 22 of the rotating pipe 2, the first layer of seal is formed by the interference fit between its outer ring and the connecting pipe 22, and the inner ring and the connecting ring 12 of the stationary pipe 1. At the same time, a structure with an annular sealing groove 220 is set on the outer ring wall of the connecting pipe 22, which, together with the sealing convex ring 210 of the outer sealing pipe 21, forms a second layer of rotational seal. The double sealing structure significantly improves the leakage prevention performance of the rotary joint. The threaded connection between the outer sealing pipe 21 and the stationary pipe 1 ensures a tight fit between the sealing convex ring 210 and the annular sealing groove 220, and facilitates installation and maintenance, thus achieving a reliable seal when the stationary pipe 1 and the rotating pipe 2 rotate relative to each other.

[0026] In a preferred embodiment, an inner extension ring 11 is integrally formed on the inner ring wall of the stationary pipe 1, extending into the interior of the connecting pipe 22. The connecting ring 12 is integrally formed with the inner extension ring 11. The inner extension ring 11 enhances the tightness between the interior of the stationary pipe 1 and the inner ring wall of the connecting pipe 22, while also providing a means for the installation of the connecting ring 12.

[0027] In a preferred embodiment, an annular mounting groove 10 is provided inside the stationary tube 1 on the outer side of the inner extension ring 11, and both the connecting tube 22 and the outer sealing tube 21 are installed in the annular mounting groove 10. The annular mounting groove 10 in the stationary tube 1 provides a precise installation and positioning space for the connecting tube 22 and the outer sealing tube 21, ensuring their coaxiality during assembly and reducing sealing failure caused by assembly deviations; the annular mounting groove 10 forms a wrapping limit for the connecting tube 22 and the outer sealing tube 21, which can buffer the influence of external vibration on the sealing structure under rotation conditions, maintain the fitting accuracy between the sealing convex ring 210 and the annular sealing groove 220, and ensure the stability of the sealing performance.

[0028] As a preferred embodiment, the end of the inner extension ring 11 close to the sealing bearing 20 is tightly fitted to the sealing bearing 20, which can provide axial positioning and support for the sealing bearing 20, preventing axial movement during rotation and affecting the sealing effect. The outer circumference of the inner extension ring 11 is tightly fitted to the inner wall of the connecting pipe 22, forming an auxiliary seal on the inner side of the sealing bearing 20, further extending the fluid leakage path. Through multiple contact cooperation, the tightness of the inner seal is strengthened, and the overall leak-proof capability is improved.

[0029] As a preferred embodiment, when the outer sealing tube 21 is fully screwed into the stationary tube 1, the outer end of the outer sealing tube 21 and the outer end of the connecting tube 22 are flush with the outer side of the stationary tube 1, making the end structure of the rotary joint flat. Two drive grooves 211 are symmetrically opened on the outer end of the outer sealing tube 21. The two drive grooves 211 on the outer end of the outer sealing tube 21 facilitate tool operation, making the installation and disassembly of the outer sealing tube 21 more convenient and labor-saving.

[0030] As a preferred embodiment, an outer sealing sleeve 3 is threadedly connected to one end of the outer circumference of the stationary tube 1 near the rotating tube 2. The inner ring of the outer sealing sleeve 3 fits tightly against the outer circumference of the rotating tube 2, forming a third seal on the outside of the rotating joint. This can block trace amounts of fluid that may leak from the inner sealing structure, thus forming multiple layers of protection.

[0031] In this preferred embodiment, when the outer sealing sleeve 3 is tightened onto the stationary pipe 1, its inner wall is tightly fitted to the end of the stationary pipe 1, the end of the outer sealing pipe 21, and the end of the connecting pipe 22. This completely covers the end gap of the rotary joint, forming an all-around external seal, effectively preventing fluid leakage from the connection gaps of the components. This fully fitted structure also forms an axial clamping force on the internal sealing assembly, maintaining the tight fit between the inner and outer sealing structures, and ensuring the durability and reliability of the sealing performance under rotation and vibration conditions.

[0032] When the sleeve furnace is running, the rotating tube 2 rotates synchronously with the furnace body, while the stationary tube 1 remains fixed. The two are connected by the connecting tube 22 to achieve relative rotation and conduct fluid. The core sealing system consists of inner and outer double main seals: the inner side forms the first seal through the sealing bearing 20 on the inner ring wall of the connecting pipe 22. The outer ring of the sealing bearing 20 is interference-fitted with the connecting pipe 22, and the inner ring is interference-fitted with the connecting ring 12 of the stationary pipe 1. The precision fit of the bearing itself and the tightness of the interference fit prevent fluid leakage from the inner dynamic-static gap. The outer side forms the second rotational seal through the annular sealing groove 220 on the outer ring wall of the connecting pipe 22 and the sealing convex ring 210 of the outer sealing pipe 21. The outer sealing pipe 21 is threaded to the inner wall of the stationary pipe 1 to ensure that the sealing convex ring 210 and the annular sealing groove 220 fit tightly together. During rotation, they always maintain surface contact sealing, further preventing fluid leakage. At the same time, the outer sealing sleeve 3 forms the third layer of protection on the outermost side. Its tight fit with the outer wall of the rotating pipe 2 and each end not only covers the end gap to prevent minor leakage, but also maintains the fit of the inner and outer sealing structures through axial clamping force. Finally, under the rotation condition, the multiple sealing synergy is achieved to ensure that there is no leakage during the fluid transmission process.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. Double seal leak-proof structure of sleeve furnace rotary joint, characterized in that: The device includes a stationary tube (1) and a rotating tube (2). A connecting tube (22) is integrally formed on the rotating tube (2) and extends into the interior of the stationary tube (1). A sealing bearing (20) is installed on the inner ring wall of the connecting tube (22). A connecting ring (12) connected to the sealing bearing (20) is integrally formed inside the stationary tube (1). The outer ring of the sealing bearing (20) is interference-fitted with the inner ring wall of the connecting tube (22), and the inner ring is interference-fitted with the outer circumferential wall of the connecting ring (12). An outer sealing tube (21) is rotatably installed on the outer ring wall of the connecting tube (22). The outer sealing tube (21) is threadedly connected to the inner wall of the stationary tube (1). Several annular sealing grooves (220) are opened on the outer circumferential wall of the connecting tube (22). A sealing convex ring (210) rotatably connected to the annular sealing groove (220) is integrally formed on the inner ring wall of the outer sealing tube (21). The sealing convex ring (210) is tightly fitted with the annular sealing groove (220).

2. The double seal leak prevention structure of the rotary joint of the sleeve furnace according to claim 1, characterized in that: An inner extension ring (11) is integrally formed on the inner ring wall of the stationary tube (1). The inner extension ring (11) extends into the interior of the connecting tube (22). The connecting ring (12) is integrally formed with the inner extension ring (11).

3. The double-sealed leak-proof structure of the rotary joint of the sleeve furnace as described in claim 2, characterized in that: The stationary tube (1) has an annular mounting groove (10) located outside the inner extension ring (11), and the connecting tube (22) and the outer sealing tube (21) are both installed in the annular mounting groove (10).

4. The double-sealed leak-proof structure of the rotary joint of the sleeve furnace as described in claim 3, characterized in that: The inner extension ring (11) is in close contact with the sealing bearing (20) at one end, and the outer circumference of the inner extension ring (11) is in close contact with the inner wall of the connecting pipe (22).

5. The double-sealed leak-proof structure of the rotary joint of the sleeve furnace as described in claim 4, characterized in that: When the outer sealing tube (21) is fully screwed into the stationary tube (1), the outer end of the outer sealing tube (21) and the outer end of the connecting tube (22) are flush with the outer side of the stationary tube (1), and two drive grooves (211) are symmetrically opened on the outer end of the outer sealing tube (21).

6. The double-seal leak-proof structure of the rotary joint of the sleeve furnace as described in claim 5, characterized in that: The outer wall of the stationary tube (1) is threaded with an outer sealing sleeve (3) near the end of the rotating tube (2), and the inner ring of the outer sealing sleeve (3) is tightly fitted with the outer wall of the rotating tube (2).

7. The double-sealed leak-proof structure of the rotary joint of the sleeve furnace as described in claim 6, characterized in that: When the outer sealing sleeve (3) is tightened on the stationary tube (1), its inner wall is in close contact with the end of the stationary tube (1), the end of the outer sealing tube (21), and the end of the connecting tube (22).

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