Rotary kiln combined sealing device and rotary kiln

Abstract

The utility model discloses a rotary kiln combined sealing device and a rotary kiln, and belongs to the technical field of calcining equipment. The combined sealing device comprises a sealing shell arranged outside the rotary kiln cylinder in a sleeving mode, one end of the sealing shell is fixed to the fixing cover, and a sealing cavity is formed between the rotary kiln cylinder and the sealing shell. At least one airtight assembly and at least one oil-tight assembly are sequentially arranged in the sealing cavity in the direction from the fixing cover to the rotary kiln cylinder, the airtight assemblies and the oil-tight assemblies both tightly abut against the interior of the sealing cavity, a fixing ring is arranged between the adjacent airtight assembly and oil-tight assembly for separation, and the fixing rings are fixed to the inner wall of the sealing shell. Wherein all the airtight assemblies are compressed through compression bolts and fixing rings in the axial direction, the compression bolts are fixedly connected to the fixing cover, all the oil-tight assemblies penetrate through the screw rod, one end of the screw rod is fixedly connected to the fixing rings, and nuts are arranged at the other end of the screw rod to compress all the oil-tight assemblies. The sealing structure has a better sealing effect and can adapt to occasions with higher temperature.

Description

A rotary kiln combined sealing device and rotary kiln Technical Field

[0001] This utility model relates to the field of rotary kiln sealing technology, and more specifically, to a rotary kiln combined sealing device and a rotary kiln. Background Technology

[0002] In the lithium-ion battery CVD rotary kiln industry, materials need to undergo chemical vapor deposition in a combustible gas environment. Once outside air enters the kiln, it will cause the material to oxidize inside the kiln shell or the combustible gas to explode, resulting in a decline in product quality and serious safety accidents. Therefore, a reliable and durable sealing device must be installed between the rotary kiln shell and the fixed cover. At the same time, the high-temperature operating conditions of the sealing parts must be considered. Thus, a reliable and durable sealing device is related to the safe and stable operation of the rotary kiln system.

[0003] A search revealed that Chinese Patent Publication No. CN101666578A, published on March 10, 2010, disclosed a rotary kiln tail sealing device. This device uses a fish-scale structure for sealing, with the fish-scale seal placed between the rotating cylinder and the fixed tail cover of the rotary kiln. However, the lack of insulation on the cylinder leads to accelerated wear of the fish-scale spring sheets at high temperatures, resulting in a short service life and easy failure. Furthermore, the sealing effect of the fish-scale seal is poor, making it unsuitable for environments containing flammable gases. Chinese Patent Publication No. CN207751314U, published on August 21, 2018, disclosed a kiln packing sealing device. This device uses graphite packing with nitrogen gas sealing in the middle. However, it only uses one set of graphite packing gas seals and lacks an insulation structure, water cooling system, and continuous pre-tightening structure, making it unsuitable for high-temperature sealing conditions. Moreover, the high thermal conductivity of graphite packing, without cooling at high temperatures, accelerates wear and compromises the reliability of the seal.

[0004] Therefore, in order to enhance the sealing performance of the components in a rotary kiln, it is urgent to design a rotary kiln combined sealing device and a rotary kiln. Summary of the Invention

[0005] 1. The problem to be solved

[0006] This utility model provides a combined sealing device for a rotary kiln, which achieves a compact and reliable structure and enhances the sealing effect through a combination of gas sealing and oil sealing design. Furthermore, a rotary kiln employing the above-mentioned combined sealing device is provided to improve the sealing performance of the rotary kiln.

[0007] 2. Technical Solution

[0008] To solve the above problems, the present invention adopts the following technical solution.

[0009] A rotary kiln combined sealing device is installed at the connection between a fixed cover and a rotary kiln shell for sealing. It includes a sealing shell fitted over the rotary kiln shell, with one end fixed to the fixed cover, forming a sealing cavity between the rotary kiln shell and the sealing shell. Within the sealing cavity, at least one airtight component and at least one oiltight component are sequentially arranged along the direction from the fixed cover toward the rotary kiln shell. Both the airtight and oiltight components are tightly abutted against the sealing cavity. Adjacent airtight and oiltight components are separated by fixing rings, which are fixed to the inner wall of the sealing shell. Each airtight component is axially compressed by a clamping bolt and a fixing ring. The clamping bolt is fixedly connected to the fixed cover. Each oiltight component passes through a screw rod, with one end fixedly connected to the fixing ring and the other end fitted with a nut to compress the oiltight components.

[0010] As one possible embodiment of this utility model, the airtight component includes a first rebound body, a nitrogen ring, and a second rebound body that are in sequential contact. The first and second rebound bodies are sleeved in the sealing cavity. The outer ring of the nitrogen ring is fixed to the inner wall of the sealing shell, and the inner ring of the nitrogen ring divides the sealing cavity to form a nitrogen chamber, which is filled with nitrogen. The first and second rebound bodies are made of high-temperature resistant material.

[0011] The oil-tight assembly includes a third resilient body, an oil ring, and a fourth resilient body connected in sequence. The third and fourth resilient bodies are fitted into the sealing cavity. The outer ring of the oil ring is fixed to the inner wall of the sealing shell, and the inner ring of the oil ring divides the sealing cavity into an oil cavity, which is filled with an oil-containing medium. The elastic modulus of the third and fourth resilient bodies is smaller than that of the first and second resilient bodies.

[0012] In one possible embodiment of this utility model, at least one nitrogen port is provided radially on the nitrogen ring, and at least one oil cup is provided radially on the oil ring.

[0013] In one possible embodiment of this utility model, the oil-containing medium filled into the oil cavity is silicone grease.

[0014] In one possible embodiment of this utility model, the first and second resilient bodies are graphite packing, and the third and fourth resilient bodies are silicone.

[0015] In one possible embodiment of this utility model, a spring and a perforated pressure ring are provided between the nut and the oil-tight assembly. The perforated pressure ring presses against the oil-tight assembly, and the two ends of the spring are respectively connected to the perforated pressure ring and the nut, and the spring is in a compressed state.

[0016] As one possible embodiment of this utility model, a pressure ring is also provided between the clamping bolt and the airtight component.

[0017] As one possible embodiment of this utility model, the sealed housing is fitted with a water-cooling jacket; and / or,

[0018] A sealing jacket is installed inside the sealed cavity and outside the rotary kiln shell, with the sealing jacket fixed to the outer wall of the rotary kiln shell.

[0019] In one possible implementation of this utility model, the sealing jacket is fixedly connected to the rotary kiln body through a partition, and the rotary kiln body, the sealing jacket, and the partition constitute a heat dissipation space.

[0020] A rotary kiln includes a fixed cover and a rotary kiln shell, wherein the above-described combined sealing device is installed at the connection between the fixed cover and the rotary kiln shell.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] This invention combines gas seals and oil seals, significantly improving the tightness of the sealing device. Taking the combination of graphite packing seals and silicone seals as an example, it improves the reliability of both the graphite packing and silicone seals. Furthermore, the installation of circulating cooling water on the outside of the sealing shell and the provision of heat dissipation space on the outside of the rotary kiln body ensure the high-temperature resistance of the combined seal. At the same time, nitrogen and cooling water are equipped with control devices, allowing for use in different temperature environments. The rotary kiln combined sealing device of this invention effectively meets the requirements of lithium battery CVD rotary kilns for sealing reliability, temperature resistance, durability, and safety. Attached Figure Description

[0024] Figure 1 is a schematic diagram of the structure of the rotary kiln of this utility model;

[0025] Figure 2 is a magnified view of region A in Figure 1;

[0026] In the diagram: 1. Fixed cover; 2. Rotary kiln shell; 3. Sealing shell; 31. Fixed ring; 4. Airtight assembly; 41. First spring body; 42. Nitrogen ring; 421. Nitrogen port; 43. Second spring body; 51. Clamping bolt; 52. Pressure ring; 6. Oiltight assembly; 61. Third spring body; 62. Oil ring; 621. Oil cup; 63. Fourth spring body; 71. Screw; 72. Nut; 73. Spring; 74. Pressure ring with hole; 8. Water cooling jacket; 9. Sealing jacket; 10. Partition plate. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model patent clearer, the technical solutions of the embodiments of this utility model patent will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model patent, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model patent.

[0028] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0029] Example

[0030] As shown in Figure 1, a rotary kiln of this embodiment includes a fixed cover 1, a rotary kiln body 2, and a rotary kiln combined sealing device. The fixed cover 1 and the rotary kiln body 2 are connected, and the connecting joint surface is sealed by the rotary kiln combined sealing device. In the working state, the fixed cover 1 and the rotary kiln combined sealing device are fixed in position, while the rotary kiln body 2 rotates along its own axis. The material is burned inside, and the combustion products flow from the rotary kiln body 2 to the fixed cover 1. The fixed cover 1 provides space for the combustion dust to settle. Finally, the combustion products are discharged from the outlet below the fixed cover 1.

[0031] Figure 2 is an enlarged view of area A in Figure 1, which is a rotary kiln combined sealing device of this embodiment. It includes a sealing shell 3 that is sleeved on the outside of the rotary kiln cylinder 2. Through holes are evenly arranged on the fixed cover 1 along the circumferential direction for installing connecting bolts. The end of the sealing shell 3 is welded with an open flange, which is fixed to the fixed cover 1 by connecting bolts, so that there is a gap between the inner wall of the sealing shell 3 and the outer wall of the rotary kiln cylinder 2 to form a sealing cavity.

[0032] An airtight component 4 and an oiltight component 6 are sequentially arranged along the direction from the fixed cover 1 toward the rotary kiln body 2 within the sealed cavity. A fixing ring 31 is provided between the airtight component 4 and the oiltight component 6 to reinforce their position. The outer ring surface of the fixing ring 31 is fixed to the upper side of the inner wall of the sealing housing 3, while the inner ring surface of the fixing ring 31 does not contact the wall of the sealed cavity. The airtight component 4 and the oiltight component 6 are tightly pressed against the sealed cavity in both the longitudinal and transverse directions. Specifically, the airtight component 4 is axially pressed against one side of the fixing ring 31 by a clamping bolt 51 fixed to the fixed cover 1. To increase the contact area of ​​the airtight component 4 under compression, a pressure ring 52 is added between the clamping bolt 51 and the airtight component 4. This helps to increase the longitudinal expansion of the rebound body in the airtight component 4 under transverse compression, thus improving the airtight sealing effect. The oil-tight component 6 runs through multiple screws 71. One end of each screw 71 is fixedly connected to a retaining ring 31, and the other end of each screw 71 is fitted with a nut 72. Tightening the nut 72 pre-tightens the oil-tight component 6, pressing it against the other side of the retaining ring 31. Both the air-tight component 4 and the oil-tight component 6 include a spring-loaded body. Under lateral compression, the spring-loaded body expands longitudinally, causing longitudinal compression of the sealing cavity and achieving a sealing performance.

[0033] Specifically, the airtight assembly 4 in this embodiment includes a first rebound body 41, a nitrogen ring 42, and a second rebound body 43 that are in sequential contact. The first rebound body 41 and the second rebound body 43 are fitted into the sealing cavity. The outer ring surface of the nitrogen ring 42 is fixed to the inner wall of the sealing housing 3, and the inner ring surface of the nitrogen ring 42 divides the sealing cavity to form a nitrogen chamber. At least one nitrogen port 421 is provided radially on the nitrogen ring 42. In order to achieve uniform air distribution and enhance airtightness, several radial through holes are provided radially on the nitrogen ring 42, each of which is connected to the nitrogen port 421 to fill the nitrogen chamber with nitrogen. Since the first rebound body 41 and the second rebound body 43 are close to the high-temperature rotary kiln shell 2, high-temperature resistant materials are selected. In this embodiment, graphite packing is used as the first rebound body 41 and the second rebound body 43.

[0034] The oil-sealing assembly 6 in this embodiment includes a third spring body 61, an oil ring 62, and a fourth spring body 63 sequentially connected to the screw 71. The third spring body 61 and the fourth spring body 63 are fitted into the sealing cavity. The outer ring surface of the oil ring 62 is fixed to the inner wall of the sealing housing 3, and the inner ring surface of the oil ring 62 divides the sealing cavity to form an oil cavity, which is filled with an oil-containing medium, such as silicone grease. The oil ring 62 has at least one threaded hole in the radial direction, and an oil cup 621 is connected to the threaded hole. Silicone grease is injected into the oil cup 621. The silicone grease can be distributed in the oil cavity through the oil ring 12 to achieve oil sealing. Silicone grease is replenished periodically according to the running time. The silicone grease is evenly distributed through the oil cup 621 to achieve the dual function of lubrication and oil sealing. In this embodiment, silicone is used as the third spring body 61 and the fourth spring body 63. The elastic modulus of silicone is less than that of graphite packing. Silicone has high elasticity and is soft and easy to drill holes and be threaded onto the screw 71, so silicone is beneficial for oil sealing. To enhance the oil sealing effect, a spring 73 and a perforated pressure ring 74 are connected between the nut 72 on the screw 71 and the silicone that it is pressed and fixed. The perforated pressure ring 74 is installed on the screw 71 and contacts the silicone. The two ends of the spring 73 are connected to the perforated pressure ring 74 and the nut 72 respectively, and the spring 73 is in a compressed state. This achieves dynamic sealing of the oil sealing component 6 when the rotary kiln cylinder 2 rotates.

[0035] Since the rotary kiln cylinder 2 is in a high-temperature state, in order to increase the service life of the combined sealing device in this embodiment, a water-cooling jacket 8 is fitted over the sealing shell 3 to form a water-cooling cavity, and circulating cooling water is provided to cool down the combined sealing device.

[0036] During operation, the rotary kiln shell 2 rotates, resulting in sliding friction with the graphite packing and silicone strip surfaces. To improve service life, a sealing jacket 9 is installed inside the sealing cavity and outside the rotary kiln shell 2. The sealing jacket 9 is fixed to the outer wall of the rotary kiln shell 2, meaning that the rotary kiln shell 2 and the sealing jacket 9 generate sliding friction to protect the graphite packing and silicone strips and ensure sealing. A water-cooling or air-cooling device can be installed inside the sealing jacket 9 to achieve further cooling.

[0037] Of course, to further enhance heat dissipation, the sealing jacket 9 is fixedly connected to the rotary kiln body 2 by a partition 10, and the rotary kiln body 2, the sealing jacket 9, and the partition 10 together form a heat dissipation space.

[0038] The rotary kiln combined sealing device in this embodiment combines graphite packing seals with silicone seals, which significantly improves the tightness of the seal; it combines gas seals with oil seals, which improves the reliability of the graphite packing and silicone strip seals; the circulation cooling water outside the sealing cavity and the sealing jacket outside the rotary kiln cylinder 2 ensure the high temperature resistance of the combined seal.

[0039] This embodiment optimizes the sealing structure and incorporates cooling and lubrication measures, thereby improving the reliability and durability of the sealing structure. It is suitable for applications requiring high sealing tightness and high-temperature environments, and is particularly applicable to the sealing conditions of lithium battery CVD rotary kilns.

[0040] The above description is illustrative of the present invention and its embodiments. This description is not restrictive and is merely one embodiment of the present invention, and is not actually limited thereto. Therefore, if those skilled in the art, inspired by this description, design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A rotary kiln combined sealing device, installed at the connection between the fixed cover (1) and the rotary kiln cylinder (2), characterized in that: The system includes a sealing shell (3) that is fitted over the rotary kiln shell (2), with one end of the sealing shell (3) fixed to the fixed cover (1), forming a sealing cavity between the rotary kiln shell (2) and the sealing shell (3); within the sealing cavity, at least one airtight component (4) and at least one oiltight component (6) are sequentially arranged along the direction from the fixed cover (1) toward the rotary kiln shell (2), with both the airtight component (4) and the oiltight component (6) tightly abutting against the sealing cavity, and adjacent airtight components (4) and oiltight components (6) are positioned close to each other. A retaining ring (31) is set to separate the components, and the retaining ring (31) is fixed to the inner wall of the sealing housing (3). Each airtight component (4) is axially pressed by a clamping bolt (51) and a retaining ring (31). The clamping bolt (51) is fixedly connected to the retaining cover (1). Each oiltight component (6) passes through a screw (71). One end of the screw (71) is fixedly connected to the retaining ring (31), and a nut (72) is set at the other end of the screw (71) to press each oiltight component (6) tightly.

2. The rotary kiln combined sealing device according to claim 1, characterized in that: The airtight assembly (4) includes a first rebound body (41), a nitrogen ring (42), and a second rebound body (43) that are in sequential contact. The first rebound body (41) and the second rebound body (43) are fitted into the sealing cavity. The outer ring of the nitrogen ring (42) is fixed to the inner wall of the sealing housing (3), and the inner ring of the nitrogen ring (42) divides the sealing cavity to form a nitrogen chamber, which is filled with nitrogen. The first rebound body (41) and the second rebound body (43) are made of high-temperature resistant material. The oil-tight assembly (6) The device includes a third rebound body (61), an oil ring (62), and a fourth rebound body (63) connected in sequence. The third rebound body (61) and the fourth rebound body (63) are fitted into the sealing cavity. The outer ring of the oil ring (62) is fixed to the inner wall of the sealing shell (3), and the inner ring of the oil ring (62) divides the sealing cavity into an oil cavity, which is filled with an oil-containing medium. The elastic modulus of the third rebound body (61) and the fourth rebound body (63) is smaller than that of the first rebound body (41) and the second rebound body (43).

3. The rotary kiln combined sealing device according to claim 2, characterized in that: The nitrogen ring (42) is provided with at least one nitrogen port (421) in the radial direction, and the oil ring (62) is provided with at least one oil cup (621) in the radial direction.

4. A rotary kiln combined sealing device according to claim 3, characterized in that: The oil-containing medium filling the oil cavity is silicone grease.

5. A rotary kiln combined sealing device according to claim 4, characterized in that: The first rebound body (41) and the second rebound body (43) are graphite packing, and the third rebound body (61) and the fourth rebound body (63) are silicone.

6. A rotary kiln combined sealing device according to claim 5, characterized in that: A spring (73) and a perforated pressure ring (74) are provided between the nut (72) and the oil-tight assembly (6). The perforated pressure ring (74) presses the oil-tight assembly (6). The two ends of the spring (73) are connected to the perforated pressure ring (74) and the nut (72) respectively, and the spring (73) is in a compressed state.

7. A rotary kiln combined sealing device according to claim 6, characterized in that: A pressure ring (52) is also provided between the clamping bolt (51) and the airtight assembly (4).

8. A rotary kiln combined sealing device according to any one of claims 1 to 7, characterized in that: The sealing shell (3) is fitted with a water cooling jacket (8); and / or, a sealing jacket (9) is provided inside the sealing cavity and outside the rotary kiln body (2), wherein the sealing jacket (9) is fixed to the outer wall of the rotary kiln body (2).

9. A rotary kiln combined sealing device according to claim 8, characterized in that: The sealing jacket (9) is fixedly connected to the rotary kiln body (2) through a partition (10), and the rotary kiln body (2), the sealing jacket (9), and the partition (10) together form a heat dissipation space.

10. A rotary kiln, comprising a fixed hood (1) and a rotary kiln cylinder (2), characterized in that: The combined sealing device according to any one of claims 1 to 9 is installed at the connection between the fixed cover (1) and the rotary kiln body (2).

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