Dynamic and static seal for large-diameter rotary kiln and use method of dynamic and static seal

Abstract

The invention discloses a dynamic and static seal for a large-diameter rotary kiln and a use method of the dynamic and static seal, relates to the technical field of dynamic and static seals of rotary kilns, and solves the problems that when an existing rotary kiln is used, a general sealing piece is small in diameter and cannot adapt to large-diameter rotary dynamic and static seals, and the sealing performance is poor. For large-diameter rotary sealing, sealing is not tight due to the size and machining precision problems, a first O-shaped side plate is installed on one side of the outer wall of a connecting O-shaped shell cover, a second O-shaped side plate is arranged on the other side of the outer wall of the connecting O-shaped shell cover, the first O-shaped side plate and the second O-shaped side plate are in threaded connection with the connecting O-shaped shell cover through first bolts, and the second O-shaped side plate is in threaded connection with the connecting O-shaped shell cover through second bolts. The first O-shaped side plate and the second O-shaped side plate are symmetrically arranged, and the first O-shaped side plate and the second O-shaped side plate and the connected O-shaped shell cover jointly form an annular sealing cavity, so that dust overflow and cold air invasion are effectively prevented, the heat efficiency of the rotary kiln is improved, and the service life of the sealing structure is prolonged; a first connecting O-shaped pad is arranged in the connecting O-shaped shell cover and is in threaded connection with the first O-shaped side plate and the second O-shaped side plate through first bolts.

Description

Technical Field

[0001] This invention relates to the field of dynamic and static sealing technology for rotary kilns, specifically to a dynamic and static seal for large-diameter rotary kilns and its application method. Background Technology

[0002] Environmentally friendly rotary kilns are a subcategory of rotary kiln equipment, belonging to building materials equipment. They are mainly used in the building materials, metallurgy, chemical, and environmental protection industries for the calcination, roasting, or chemical treatment of solid materials. Their structure includes components such as the kiln shell, kiln ring, and supporting rollers. The kiln shell is lined with refractory material, and continuous operation is achieved through rotation. Based on the materials processed, they can be divided into cement kilns, metallurgical and chemical kilns, and lime kilns. Cement kilns are further divided into dry-process and wet-process types; the latter is listed as a restricted and phased-out kiln type due to its higher energy consumption.

[0003] For example, Chinese Patent No. CN202329084U (A Rotary Kiln Sealing Device) includes: a labyrinth-type sealing structure; a rotary kiln sleeve fixedly sealed to the rotary kiln cylinder; a fixed flange located at the open end of the labyrinth-type sealing ring; and a truncated cone-shaped contact sealing cover that is in contact with the rotary kiln sleeve. This utility model combines the advantages of non-contact and contact sealing, and incorporates a sleeve and a blowing cooling system to protect the rotary kiln end cylinder and reduce heat radiation to the sealing device. This not only provides a good sealing effect but also extends the service life of the rotary kiln end cylinder and the seal.

[0004] Existing rotary kilns all suffer from gaps at the joints and inadequate sealing during use; therefore, we provide a dynamic and static seal for large-diameter rotary kilns and its application method. Summary of the Invention

[0005] The purpose of this invention is to provide a dynamic and static seal for large-diameter rotary kilns and its application method, so as to solve the problems mentioned in the background art, which are that existing rotary kilns have gaps at the connection and poor sealing during use.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a dynamic and static seal for a large-diameter rotary kiln, comprising a connecting corrugated pipe and a connecting O-ring housing, wherein the connecting corrugated pipe is installed on one side of the connecting O-ring housing;

[0007] Also includes:

[0008] A first O-ring side plate is installed on one side of the outer wall of the connecting O-ring housing. A second O-ring side plate is provided on the other side of the outer wall of the connecting O-ring housing. Both the first and second O-ring side plates are threadedly connected to the connecting O-ring housing by first bolts, and several first bolts are provided. The first and second O-ring side plates are symmetrically arranged. Together with the connecting O-ring housing, they form an annular sealed chamber, which effectively prevents dust from overflowing and cold air from intruding, improves the thermal efficiency of the rotary kiln, and extends the service life of the sealing structure. A first connecting O-ring gasket is provided inside the connecting O-ring housing. The first connecting O-ring gasket is threadedly connected to the first and second O-ring side plates by first bolts.

[0009] Preferably, a first connecting O-ring gasket is provided inside the connecting O-ring housing, a high-strength sealing gasket is provided on one side of the first O-ring side plate, and a limit protrusion is provided inside one side of the high-strength sealing gasket.

[0010] Preferably, the inner wall of the first O-shaped side plate is provided with an embedded groove, and a U-shaped plug ring is provided inside the embedded groove. There are two U-shaped plug rings, and both U-shaped plug rings are embedded.

[0011] Preferably, a connecting mounting ring is provided on one side of the second O-shaped side plate, and the connecting mounting ring is installed between the second O-shaped side plate and the connecting corrugated pipe.

[0012] Preferably, the outer wall of the connecting mounting ring is provided with bolt mounting holes, and there are several bolt mounting holes. The connecting mounting ring is threadedly connected to the second O-ring side plate by a second bolt.

[0013] Preferably, a pressure gauge mechanism is provided below one side of the first O-shaped side plate, and the pressure gauge mechanism is fixedly connected to the first O-shaped side plate.

[0014] Preferably, a connecting joint is provided above one side of the first O-shaped side plate, and the connecting joint is fixedly connected to the first O-shaped side plate.

[0015] Preferably, the upper side of the first O-shaped side plate is provided with a second reserved mounting hole groove, and the lower side of the first O-shaped side plate is provided with a first reserved mounting hole groove. The first and second reserved mounting hole grooves are integrally formed with the first O-shaped side plate.

[0016] Preferably, a side mounting plate is provided at the end of the connecting corrugated pipe away from the connecting O-ring housing. A connecting mounting piece is provided around the outer wall of the side mounting plate, and there are several connecting mounting pieces. The connecting mounting ring is threadedly connected to the connecting mounting piece by a mounting bolt rod, and there are several mounting bolt rods.

[0017] Preferably, a method for using dynamic and static seals in a large-diameter rotary kiln includes the following steps:

[0018] Step 1: Install the first connecting O-ring inside the connecting O-ring housing, the first O-ring side plate, and the second O-ring side plate, and secure it with the first bolt.

[0019] Step 2: Next, install the connecting mounting ring on one side of the first connecting O-ring using the second bolt and rotate it synchronously;

[0020] Step 3: Fix the high-strength sealing gasket in the groove on the outer wall of the large-diameter rotary kiln. At the same time, the connecting corrugated pipe, connecting O-ring cover, and connecting mounting ring all wrap around the connection of the large-diameter rotary kiln. Gas is supplied into the inner groove through the first reserved mounting hole. The supplied gas can expand the U-shaped plug ring, so that the expanded U-shaped plug ring can seal with the high-strength sealing gasket, achieving a highly efficient dynamic sealing effect.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention achieves dynamic tight fit with the high-strength sealing gasket installed on the rotary kiln body by setting an embedded groove and two U-shaped plug rings in the first O-shaped side plate, and by using the first reserved mounting hole groove to supply gas to the embedded groove to expand the U-shaped plug rings. This gas-filled sealing mechanism can adaptively compensate for the wear of the sealing surface caused by the long-term operation of the rotary kiln and the gap changes caused by the thermal expansion and contraction and sway of the kiln body, which significantly improves the reliability and durability of the dynamic seal and effectively solves the problem of poor sealing caused by gaps at the connection.

[0023] 2. By connecting the O-ring outer casing, the first O-ring side plate, and the second O-ring side plate, a closed annular sealed chamber is formed. This structure completely encloses the dynamic and static interfaces of the rotary kiln, which can effectively prevent the overflow of high-temperature dust inside the kiln and prevent the intrusion of external cold air. This helps to maintain a stable thermal regime inside the kiln, reduce heat loss, thereby improving the thermal efficiency of the rotary kiln and reducing the environmental impact of dust emissions.

[0024] 3. The present invention adopts a modular assembly design. All major components, such as the connecting O-ring housing, the first O-ring side plate, the second O-ring side plate, the first connecting O-ring gasket, and the connecting mounting ring, are connected by bolts. This structure facilitates the individual manufacturing and transportation of each component, as well as rapid on-site installation and disassembly. It greatly facilitates subsequent maintenance, repair, or replacement of sealing elements, and reduces maintenance costs and downtime.

[0025] 4. This invention features a pressure gauge mechanism on the first O-ring side plate, which can monitor the gas pressure in the embedded groove in real time. Operators can judge the opening state and sealing performance of the U-shaped plug ring based on the pressure reading, enabling monitoring and early warning of the sealing status. This facilitates timely maintenance and adjustment, ensuring long-term stable operation of the seal. The high-strength sealing gasket has a limiting protrusion on one side, which helps to accurately position it during installation and prevent displacement. The two U-shaped plug rings are embedded, resulting in a compact structure and reliable fixation. The first connecting O-ring gasket enhances the static sealing effect between the connecting O-ring housing and the two side plates, forming a multi-layered sealing barrier that combines dynamic and static elements. The overall sealing structure is more rigorous and durable. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the overall structure of the present invention from a first angle;

[0028] Figure 3 This is a schematic diagram of the overall structure of the present invention from a second angle;

[0029] Figure 4 This is a schematic diagram of the overall cross-sectional structure of the present invention;

[0030] Figure 5 This is an enlarged schematic diagram of a partial structure at point A of the present invention;

[0031] In the diagram: 100, connecting corrugated pipe; 101, side mounting plate; 102, connecting mounting piece; 200, connecting O-ring housing; 2001, first connecting O-ring gasket; 2002, high-strength sealing gasket; 2003, limiting protrusion strip; 2004, embedded groove; 2005, U-shaped plug ring; 201, first O-ring side plate; 202, first reserved mounting hole groove; 203, second O-ring side plate; 204, pressure gauge mechanism; 205, connecting joint; 206, second reserved mounting hole groove; 300, connecting mounting ring; 301, bolt mounting hole; 400, first bolt; 500, second bolt; 600, mounting bolt rod. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] Example 1

[0034] Please see Figures 1 to 5 This embodiment provides a specific implementation method for dynamic and static sealing of large-diameter rotary kilns.

[0035] The dynamic and static sealing device mainly consists of a connecting corrugated pipe 100, a connecting O-ring housing 200, a first O-ring side plate 201, a second O-ring side plate 203, a connecting mounting ring 300, and related sealing elements and connectors.

[0036] One end of the connecting corrugated pipe 100 is provided with a side mounting plate 101, and a plurality of connecting mounting pieces 102 are evenly distributed on the outer periphery of the side mounting plate 101. The other end of the connecting corrugated pipe 100 is connected to one side of the connecting O-ring housing 200. The connecting O-ring housing 200 is an annular shell shape, and a first connecting O-ring gasket 2001 is embedded inside it to provide a static sealing foundation.

[0037] The first O-ring side plate 201 and the second O-ring side plate 203 are symmetrically arranged annular plates. They are respectively installed on both sides of the outer wall of the connecting O-ring housing 200 by multiple first bolts 400. The edge of the first connecting O-ring gasket 2001 is also pressed between the first O-ring side plate 201 and the second O-ring side plate 203 by the first bolts 400, so that the connecting O-ring housing 200, the first O-ring side plate 201, the second O-ring side plate 203 and the first connecting O-ring gasket 2001 are assembled together to form an integral annular sealing assembly with an internal cavity.

[0038] An annular recessed groove 2004 is formed on the inner wall of the first O-shaped side plate 201 (i.e., the side facing the rotary kiln body). Two U-shaped sealing rings 2005 are embedded in the recessed groove 2004. The U-shaped sealing rings 2005 are made of elastic sealing material and their openings face the rotary kiln body. The first O-shaped side plate 201 is also provided with a first reserved installation slot 202 and a second reserved installation slot 206. The first reserved installation slot 202 is connected to the recessed groove 2004 through an internal channel. A connecting joint 205 and a pressure gauge mechanism 204 are installed on the first O-shaped side plate 201. The connecting joint 205 can be used to connect to an external gas source, and the pressure gauge mechanism 204 is used to monitor the gas pressure in the recessed groove 2004.

[0039] A connecting mounting ring 300 is provided on the outer side of the second O-shaped side plate 203. The connecting mounting ring 300 is fixedly connected to the second O-shaped side plate 203 by multiple second bolts 500. Multiple bolt mounting holes 301 are provided on the connecting mounting ring 300. The connecting mounting ring 300 is then fixedly connected to the connecting mounting piece 102 at the end of the connecting corrugated pipe 100 by multiple mounting bolt rods 600, thereby firmly connecting the entire annular sealing assembly to the connecting corrugated pipe 100. The function of the bolt rods 600 is to ensure that the torque on the flange at one end of the connecting corrugated pipe 100 is completely transmitted to the flange of the connecting mounting ring 300 through the bolt rods 600. This is because the corrugated pipe 100 cannot transmit rotational torque, and the corrugated pipe only ensures the internal airtightness.

[0040] High-strength sealing gaskets 2002 are pre-installed at the corresponding positions in the rotary kiln body where sealing is required. The inner side of the gasket has a limiting protrusion 2003, which is used to be inserted into the groove of the kiln body to achieve positioning and fixation.

[0041] During assembly, firstly, place the first connecting O-ring gasket 2001 into the connecting O-ring housing 200, then align the first O-ring side plate 201 and the second O-ring side plate 203, and use the first bolt 400 to fasten them together with the connecting O-ring housing 200. Subsequently, use the second bolt 500 to install the connecting mounting ring 300 onto the second O-ring side plate 203. Next, use the mounting bolt rod 600 to connect and fix the entire assembled sealing assembly to the connecting mounting piece 102 at the end of the connecting corrugated pipe 100. Finally, install the high-strength sealing gasket 2002 onto the rotary kiln body, ensuring that the area of ​​the U-shaped plug ring 2005 on the first O-ring side plate 201 is aligned with the high-strength sealing gasket 2002.

[0042] In use, gas (such as compressed air) at a certain pressure is introduced into the embedded groove 2004 through the connecting joint 205 and the first reserved mounting hole groove 202. The gas pressure causes the lips of the two U-shaped plug rings 2005 to open outward and press tightly against the sealing surface of the high-strength sealing gasket 2002, forming a reliable dynamic seal. The pressure detection gauge mechanism 204 can display the sealing pressure in real time to ensure the sealing effect. When the rotary kiln is running, the kiln body may wobble or radially jump. The U-shaped plug rings 2005 in the air-filled state can generate elastic deformation accordingly, always maintaining a tight contact pressure, thereby achieving efficient dynamic and static sealing.

[0043] Example 2

[0044] Based on the basic structure of Example 1, this embodiment further describes the application scenarios and advantages of the dynamic and static seal in large-diameter rotary kilns.

[0045] This sealing structure provides an effective solution for the annular gap between the kiln head or tail of a large-diameter rotary kiln and fixed components (such as the feed hood, discharge hood, or connecting corrugated pipe 100). Since its annular sealing chamber is composed of the connecting O-type outer shell 200 and the first O-type side plate 201 and the second O-type side plate 203, the structure has good rigidity and can adapt to the larger structural size required for large diameters without easily deforming.

[0046] In actual installation, the connecting corrugated pipe 100 is usually connected to a fixed feeding or discharging device. The high-strength sealing gasket 2002 is fitted and fixed to the end of the rotary kiln body. This sealing device is installed on the connecting corrugated pipe 100 through the connecting mounting ring 300 and the mounting bolt rod 600, so that the embedded groove 2004 and the U-shaped plug ring 2005 on the first O-shaped side plate 201 maintain an appropriate initial gap in the radial direction with the high-strength sealing gasket 2002 on the kiln body.

[0047] During the sealing process, the U-shaped plug ring 2005 expands by inflation, and its sealing lip adheres to the gasket with uniform circumferential pressure. This design has excellent following and compensation capabilities for the axial movement and radial runout (sway) of the kiln body. Even if a large amount of thermal expansion or mechanical deformation occurs during the operation of a large-diameter rotary kiln, the inflation pressure can be adjusted or the elasticity of the U-shaped plug ring itself can be used to adapt to the gap change, avoiding the problems of increased wear or instantaneous leakage that may occur with traditional rigid contact seals.

[0048] In addition, when the U-shaped sealing ring 2005 wears out due to long-term use, it can be compensated by slightly increasing the inflation pressure to extend its service life. The pressure gauge mechanism 204 provides a visual basis for this maintenance. When the sealing ring needs to be replaced, simply depressurize and remove the first bolt 400 to replace the first O-ring side plate 201 or the U-shaped sealing ring 2005 therein. The maintenance work does not require large-scale hoisting or cutting and welding, and is simple and quick.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A dynamic and static seal for a large-diameter rotary kiln, comprising a connecting corrugated pipe (100) and a connecting O-ring housing (200), wherein the connecting corrugated pipe (100) is installed on one side of the connecting O-ring housing (200); Its features are, Also includes: The first O-type side plate (201) is installed on one side of the outer wall of the connecting O-type housing (200). The other side of the outer wall of the connecting O-type housing (200) is provided with a second O-type side plate (203). The first O-type side plate (201) and the second O-type side plate (203) are both threadedly connected to the connecting O-type housing (200) by first bolts (400), and there are several first bolts (400). The first O-type side plate (201) and the second O-type side plate (203) are symmetrically arranged. Together with the connecting O-type housing (200), they form an annular sealed chamber, which effectively prevents dust from overflowing and cold air from intruding, improves the thermal efficiency of the rotary kiln and extends the service life of the sealing structure. The interior of the connecting O-type housing (200) is provided with a first connecting O-type gasket (2001). The first connecting O-type gasket (2001) is also threadedly connected to the first O-type side plate (201) and the second O-type side plate (203) by first bolts (400).

2. The dynamic and static seal for a large-diameter rotary kiln according to claim 1, characterized in that: The interior of the connecting O-ring housing (200) is provided with a first connecting O-ring gasket (2001), and a high-strength sealing gasket (2002) is provided on one side of the first O-ring side plate (201). A limit protrusion strip (2003) is provided inside one side of the high-strength sealing gasket (2002).

3. The dynamic and static seal for a large-diameter rotary kiln according to claim 2, characterized in that: The inner wall of the first O-shaped side plate (201) is provided with an embedded groove (2004), and a U-shaped plug ring (2005) is provided inside the embedded groove (2004). There are two U-shaped plug rings (2005), and both U-shaped plug rings (2005) are embedded.

4. The dynamic and static seal for a large-diameter rotary kiln according to claim 3, characterized in that: A connecting mounting ring (300) is provided on one side of the second O-shaped side plate (203), and the connecting mounting ring (300) is installed between the second O-shaped side plate (203) and the connecting corrugated pipe (100).

5. A dynamic and static seal for a large-diameter rotary kiln according to claim 4, characterized in that: The connecting mounting ring (300) has bolt mounting holes (301) inside its outer wall, and there are several bolt mounting holes (301). The connecting mounting ring (300) is threadedly connected to the second O-type side plate (203) by a second bolt (500).

6. A dynamic and static seal for a large-diameter rotary kiln according to claim 5, characterized in that: A pressure gauge mechanism (204) is provided on the lower side of one side of the first O-shaped side plate (201), and the pressure gauge mechanism (204) is fixedly connected to the first O-shaped side plate (201).

7. A dynamic and static seal for a large-diameter rotary kiln according to claim 6, characterized in that: A connecting joint (205) is provided on the upper side of one side of the first O-shaped side plate (201), and the connecting joint (205) is fixedly connected to the first O-shaped side plate (201).

8. A dynamic and static seal for a large-diameter rotary kiln according to claim 7, characterized in that: The upper side of the first O-shaped side plate (201) is provided with a second reserved mounting slot (206), and the lower side of the first O-shaped side plate (201) is provided with a first reserved mounting slot (202). The first reserved mounting slot (202) and the second reserved mounting slot (206) are integrally formed with the first O-shaped side plate (201).

9. A dynamic and static seal for a large-diameter rotary kiln according to claim 8, characterized in that: The end of the connecting corrugated pipe (100) away from the connecting O-ring housing (200) is provided with a side mounting plate (101). A connecting mounting piece (102) is provided around the outer wall of the side mounting plate (101), and there are several connecting mounting pieces (102). The connecting mounting ring (300) is threadedly connected to the connecting mounting piece (102) through the mounting bolt rod (600), and there are several mounting bolt rods (600).

10. A method of using a dynamic and static seal for a large-diameter rotary kiln, based on the dynamic and static seal for a large-diameter rotary kiln as described in claims 1-9, characterized in that, Includes the following steps: Step 1: Install the first connecting O-ring 2001 inside the connecting O-ring housing 200, the first O-ring side plate 201, and the second O-ring side plate 203, and secure it with the first bolt 400. Step 2: Next, install the connecting mounting ring 300 on one side of the first connecting O-ring 2001 using the second bolt 500 and rotate synchronously; Step 3: Fix the high-strength sealing gasket 2002 in the groove on the outer wall of the large-diameter rotary kiln. At the same time, the connecting corrugated pipe 100, the connecting O-ring cover 200, and the connecting mounting ring 300 all wrap around the connection of the large-diameter rotary kiln. Gas is supplied into the inner groove 2004 through the first reserved mounting hole groove 202. The supplied gas can expand the U-shaped plug ring 2005, so that the expanded U-shaped plug ring 2005 seals with the high-strength sealing gasket 2002, achieving a highly efficient dynamic and static sealing effect.

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