Sealing device of rotary kiln

Abstract

The sealing device comprises a kiln body, a heat insulation sleeve, a sealing assembly and a kiln head and tail cover, the heat insulation sleeve and the kiln head and tail cover are installed on the two sides of the kiln body, the kiln body is sleeved with the heat insulation sleeve, an inner cavity of the kiln body is communicated with the interior of the kiln head and tail cover, and the sealing assembly is installed at the joint of the kiln head and tail cover and the kiln body. The sealing assembly comprises a sealer fixing disc, an air seal air inlet is formed in the sealer fixing disc, an air seal chamber is arranged on the inner diameter of the sealer fixing disc, the air seal air inlet is connected with the air seal chamber, and the air pressure in the air seal chamber is slightly larger than the working pressure in the kiln. The airtight chamber is additionally arranged between the inner sealing chamber and the outer sealing chamber, the pressure of inert gas in the airtight chamber is slightly larger than the working pressure in the kiln, it is guaranteed that a trace amount of leaked hot gas in the inner sealing chamber cannot overflow to the outer sealing chamber, it is guaranteed that the outer sealing chamber operates at the low temperature, and meanwhile the sealing performance of the dynamic seal is better guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kiln sealing, in particular to a sealing device for a rotary kiln. Background Art

[0002] Rotary kiln is a thermal equipment widely used in cement, metallurgy, ceramics, environmental protection and other industries. It is mainly composed of kiln head, kiln tail and cylinder. The kiln head, kiln tail and cylinder are sealed and connected. Traditional seals generally use fish scale seals, labyrinth seals, end face friction seals, etc.

[0003] Among them, labyrinth seals are divided into axial labyrinth seals and radial labyrinth seals. They have a simple structure and no contact surface, which avoids the friction problem of the contact surface. However, considering the thermal expansion and contraction, bending, radial runout and other factors of the device, when using labyrinth seals for sealing, a gap is usually reserved on the kiln body. Therefore, there are air leakage, material leakage, and excessive external temperature in the gap. The sealing effect is not good and is only suitable for working conditions with a small internal and external pressure difference and low sealing requirements. With the development of industry, the requirements for rotary kiln sealing are getting higher and higher, especially the rise of the waste lithium battery recycling industry, which puts higher and higher requirements on the control of oxygen content in the rotary kiln. The above sealing method cannot meet the use requirements. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and utility model name of this application to avoid blurring the purpose of this section, specification abstract and utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above problems existing in the existing rotary kiln dynamic seal, the utility model is proposed. The technical problem solved by the utility model is that the existing labyrinth seal will reserve a large gap when sealing, the sealing effect is not good, and it is easy to leak air, leak material, and the peripheral temperature is too high.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a sealing device of a rotary kiln comprises a kiln body, a heat insulating sleeve, a sealing assembly and a kiln head and kiln tail hood, characterized in that: the kiln head and kiln tail hoods are connected at both ends of the kiln body, the heat insulating sleeve is sleeved on the kiln body connected to the kiln head and kiln tail hoods, the sealing assembly is installed at the connection between the kiln head and kiln tail hoods and the kiln body, and is sleeved on the outside of the heat insulating sleeve to achieve sealing between the kiln body and the kiln head and kiln tail hoods; the sealing assembly comprises a sealer fixing disk, the sealer fixing disk is installed on the kiln head and kiln tail hoods and pressed against the outside of the heat insulating sleeve, a sealable air-sealed air inlet is provided on the sealer fixing disk, an air-sealed chamber is provided on the inner diameter, the air-sealed air inlet is connected to the air-sealed chamber, and the gas pressure in the air-sealed chamber is slightly greater than the working pressure in the kiln.

[0007] As a preferred solution of the sealing device of the rotary kiln described in the utility model, wherein: the sealing assembly also includes an inner sealing chamber and an outer sealing chamber, the inner sealing chamber and the outer sealing chamber are arranged on the contact surface of the sealer fixing plate and the insulation sleeve, the air sealing chamber is between the inner sealing chamber and the outer sealing chamber, the outer sealing chamber is arranged on the side of the air sealing chamber facing the outside, and the inner sealing chamber is arranged on the side of the air sealing chamber facing the inside of the kiln.

[0008] As a preferred solution of the sealing device of the rotary kiln described in the utility model, wherein: a sealing packing is arranged in the inner sealing chamber, a packing pressing block is further arranged on one side of the sealing packing, and the sealing packing is pressed by the packing pressing block.

[0009] As a preferred solution of the sealing device of the rotary kiln described in the utility model, the packing block is an L-shaped structure, one end of the packing block extends into the inner sealing chamber to compress the sealing packing, and a bolt hole is arranged at the other end. A bolt hole is also arranged at a relative position of the sealer fixing plate, and the packing block and the sealing packing are connected by fastening bolts through the two bolt holes.

[0010] As a preferred solution of the sealing device of the rotary kiln described in the utility model, wherein: an outer sealing ring, a pressure ring and an inner sealing ring are arranged in the outer sealing chamber, all of which are sleeved on the outside of the thermal insulation sleeve, the inner sealing ring is arranged adjacent to the air sealing chamber, the outer sealing ring is adjacent to the outside, and the pressure ring is installed between the outer sealing ring and the inner sealing ring.

[0011] As a preferred solution of the sealing device of the rotary kiln described in the utility model, a sealing ring pressing block is arranged on the outer side of the outer sealing ring.

[0012] As a preferred solution of the sealing device of the rotary kiln described in the utility model, the sealing ring pressing block can be an L-shaped structure, one end of the sealing ring pressing block extends into the outer sealing chamber to compress the outer sealing ring, and a bolt hole is arranged at the other end. A bolt hole is also arranged at a relative position of the sealer fixing plate, and the sealing ring pressing block and the outer sealing ring are connected by a fastening bolt through two bolt holes.

[0013] As a preferred solution of the sealing device of the rotary kiln described in the utility model, wherein: the heat insulation sleeve is welded on the kiln body, and the inner space of the heat insulation sleeve is filled with heat insulation cotton.

[0014] As a preferred solution of the sealing device of the rotary kiln described in the utility model, the gas in the air sealing chamber is an inert gas.

[0015] As a preferred solution of the sealing device of the rotary kiln described in the utility model, wherein: the sealing components can be arranged in multiple groups along the outside of the thermal insulation sleeve.

[0016] The sealing device of the rotary kiln constructed by the utility model has the following advantages:

[0017] (1) By setting a sealable air inlet and air sealing chamber on the inner diameter of the sealer fixing plate, and making the gas pressure in the air sealing chamber greater than the working pressure in the kiln, the gas in the kiln is prevented from leaking out and the sealing is enhanced;

[0018] (2) By setting inner and outer sealing chambers on both sides of the gas sealing chamber, and setting inert gas in the gas sealing chamber, it is ensured that the hot gas leaked from the inner sealing chamber will not overflow into the outer sealing chamber, and the outer sealing chamber is ensured to operate at a low temperature, thereby better ensuring the sealing performance of the dynamic seal;

[0019] (3) By filling the insulation sleeve with insulation cotton and sealing the inner sealing chamber, the temperature inside the kiln is isolated from being transmitted to the outer sealing chamber, which provides a strong guarantee for the selection of low-cost materials for the sealing ring of the outer sealing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0021] Figure 1 This is a schematic diagram of the overall structure of a sealing device for a rotary kiln according to an embodiment of the utility model;

[0022] Figure 2The present invention is a schematic diagram of the sealing assembly structure of a sealing device for a rotary kiln according to an embodiment of the present invention.

[0023] The markings of the various components in the accompanying drawings are as follows: kiln body - 1; insulation sleeve - 2; insulation cotton - 3; sealing assembly - 4; kiln head and kiln tail cover - 5; sealing ring block - 6; fastening bolt one - 7; outer sealing ring - 8; pressure ring - 9; inner sealing ring - 10; air seal air inlet - 11; sealer fixing plate - 12; packing block - 13; fastening bolt two - 14; packing - 15; air seal chamber - 16; inner sealing chamber - 17; outer sealing chamber - 18. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary persons in the field without creative work should fall within the scope of protection of the utility model.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0027] The utility model is described in detail with reference to the schematic diagram. When describing the embodiments of the utility model, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general proportion, and the schematic diagrams are only examples, which should not limit the scope of protection of the utility model. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0028] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the present utility model, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integrated connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two original components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0030] Reference Figure 1 and 2The embodiment provides a sealing device for a rotary kiln, comprising a kiln body 1, an insulation sleeve 2, a sealing component 4 and a kiln head and kiln tail cover 5. The insulation sleeve 2 is welded and sleeved on the kiln body 1. In the present embodiment, the kiln body 1 is a barrel-shaped structure with a thick middle and thin ends, and the thick and thin parts are slowly transitioned through an inclined surface. The insulation sleeve 2 can be welded on the transition surface of the kiln body 1 and sleeve the thinner parts at both ends of the kiln body 1. The internal space formed by the insulation sleeve 2 and the outer wall of the kiln body 1 is filled with insulation cotton 3 to ensure that the high temperature in the kiln body 1 will not be transmitted to the outer surface of the insulation sleeve 2; the kiln head and kiln tail covers 5 are also connected to the two ends of the kiln body 1, and the inner cavity of the kiln body 1 is communicated with the interior of the kiln head and kiln tail cover 5. The sealing component 4 is installed at the connection position of the kiln head and kiln tail cover 5 and the kiln body 1. Two sealing components 4 are provided and symmetrically sleeved on the outside of the insulation sleeve 2 to achieve sealing between the kiln body 1 and the kiln head and kiln tail cover 5; the sealing component 4 includes a sealing device fixing plate 12, and the sealing device fixing plate 12 is installed and fixed on the kiln The head and tail hood 5 is mounted on the kiln head and tail hood 5 and pressed against the outside of the insulation sleeve 2 to seal the connection position between the kiln head and kiln tail hood 5 and the insulation sleeve 2. An air-sealing chamber 16 is provided on the inner diameter of the sealer fixing disk 12, and a closable air-sealing air inlet 11 is provided on the sealer fixing disk 12 connected to the air-sealing chamber 16. Furthermore, the sealing assembly 4 also includes an inner sealing chamber 17 and an outer sealing chamber 18, which are arranged on the contact surface between the sealer fixing disk 12 and the insulation sleeve 2. The air-sealing chamber 16 is between the inner sealing chamber 17 and the outer sealing chamber 18, the outer sealing chamber 18 is arranged on the side of the air-sealing chamber 16 facing the outside, and the inner sealing chamber 17 is arranged on the side of the air-sealing chamber 16 facing the inside of the kiln. When the inert gas pressure in the air-sealing chamber 16 is slightly greater than the working pressure inside the kiln body 1, the air-sealing air inlet 11 is sealed by various means such as an air-sealing plug, a sealing ring, and a sealing film to prevent the hot gas leaking in the cavity from overflowing to the outside, thereby further ensuring the sealing and insulation effects.

[0031] When the sealing device of the rotary kiln is used, the temperature in the kiln body 1 of the rotary kiln can be as high as 1200°C. The insulation sleeve 2 is welded on the kiln body 1. The insulation cotton 3 filled in the insulation sleeve 2 ensures that the high temperature in the kiln body 1 will not be transmitted to the outer surface of the insulation sleeve 2. The sealer fixing plate 12 in the sealing component 4 seals the connection position between the kiln head and kiln tail cover 5 and the insulation sleeve 2. Since the insulation sleeve 2 is put on the kiln body 1, the inner cavity of the kiln body 1 is communicated with the interior of the kiln head and kiln tail cover 5. The connection between the kiln body 1 and the kiln head and kiln tail cover 5 is the connection between the kiln head and kiln tail cover 5 and the insulation sleeve 2. When the sealing effect of the connection position between the kiln head and kiln tail cover 5 and the insulation sleeve 2 is good, it means that there is good sealing between the kiln body 1 and the kiln head and kiln tail cover 5. In addition, an air sealing chamber 16 filled with inert gas is arranged on the inner diameter of the sealer fixing plate 12. The sealer fixing plate 12 is divided into two parts, the inner and outer sealing chambers. If the sealer The compression seal between the fixed disk 12 and the insulation sleeve 2 is not complete, and the hot air inside the kiln body 1 will first enter the inner sealing chamber 17 and be transmitted from the inner sealing chamber 17 to the air sealing chamber 16. Since the air sealing chamber 16 is filled with an inert gas whose gas pressure is greater than the working pressure in the kiln, and since the gas pressure in the air sealing chamber 16 is relatively high, when the working hot air is transmitted to the air sealing chamber 16, it will not continue to be transmitted to the outer sealing chamber 18. In addition, the air sealing chamber 16 uses an inert gas and will not react with the gas in the kiln. On the other hand, if the seal is incomplete, external air will also be transmitted from the outer sealing chamber 18 to the air sealing chamber 16. The outside is room temperature air, so the air pressure is relatively low. When it is transmitted to the air sealing chamber 16, it will not be further transmitted. Therefore, it can prevent the hot gas leaking in the cavity from overflowing to the outside, and also prevent the external air from entering the kiln, further ensuring the sealing and heat insulation effects.

[0032] It should be noted that the top of the insulation sleeve 2 used in the present embodiment needs to be subjected to fine processing such as turning before installation. The rotary kiln will be accompanied by irregular vibrations during operation, which will cause end face and radial runout at the connection between the insulation sleeve 2 and the kiln head and kiln tail cover 5. The insulation sleeve 2 after fine processing has smooth edges and corners, and the runout is eliminated to a certain extent. The insulation cotton 3 filled inside the insulation sleeve 2 can use glass fiber insulation cotton, including glass fiber cotton, glass wool, etc., and can also use further processed composite aluminum foil, glass fiber cloth, etc., and the material of the insulation cotton 3 is not limited here.

[0033] In the embodiments, reference Figure 2A sealing packing 15 is arranged in the inner sealing chamber 17, and a packing pressing block 13 is also arranged on one side of the sealing packing 15. The packing pressing block 13 presses the sealing packing 15 in the inner sealing chamber 17. In the present embodiment, the packing pressure plate 13 can be an L-shaped structure, one end of the packing pressure plate 13 extends into the inner sealing chamber 17, and a bolt hole is arranged at the other end, and a bolt hole is also arranged at a relative position of the sealer fixing plate 12. The fastening bolt 14 passes through the bolt hole of the packing pressure plate 13 and extends into the bolt hole of the sealer fixing plate 12. By rotating the fastening bolt 14, the packing pressure plate 13 can be driven to move into the inside of the sealer fixing plate 12, and then gradually reach the position of the sealing packing 15, so as to press the sealing packing 15 and achieve a sealing effect.

[0034] In the embodiments, reference Figure 2 An outer sealing ring 8, a pressure ring 9 and an inner sealing ring 10 are arranged in the outer sealing chamber 18, and the three are all sleeved on the outside of the insulation sleeve 2. The inner sealing ring 10 is arranged adjacent to the air sealing chamber 16, and the outer sealing ring 8 is adjacent to the external space. The pressure ring 9 is installed between the outer sealing ring 8 and the inner sealing ring 10, and the three are installed adjacent to each other. In addition, a sealing ring pressing block 6 is arranged on the outside of the outer sealing ring 8, and the sealing ring pressing block 6 is an L-shaped structure. One end of the sealing ring pressing block 6 extends into the outer sealing chamber 18, and the other end is provided with a bolt hole, and a bolt hole is also provided at the relative position of the sealer fixing disk 12. The fastening bolt 7 passes through the bolt hole of the sealing ring pressing block 6 and extends into the bolt hole of the sealer fixing disk 12. By rotating the fastening bolt 7, the sealing ring pressing block 6 can be driven to move toward the inside of the sealer fixing disk 12, and then gradually reaches the position of the outer sealing ring 8, thereby pressing the outer sealing ring 8 to achieve a sealing effect.

[0035] It should be noted that the high-temperature gas in the kiln will leak into the inner sealing chamber 17. If the high-temperature gas reaches the outer sealing chamber, it needs to pass through the inner sealing chamber 17, the air sealing chamber 16, the insulation sleeve 2 and the insulation cotton 3 for sealing and heat insulation. After the above-mentioned device is used for sealing and heat insulation, the temperature of the outer sealing chamber can be less than 200°C. Therefore, a sealing ring with low manufacturing cost can be used in the outer sealing chamber 18, which reduces the consumption of sealing materials and reduces the sealing cost. In addition, the present application uses fastening bolts, and the fastening bolts 14 fixed on the packing pressure plate 13 need to use high-temperature resistant materials, while the fastening bolts 7 fixed on the sealing ring block 6 can use other low-cost materials.

[0036] Furthermore, in the present embodiment, two sealing assemblies 4 are used to seal the rotary kiln, but the sealing assemblies 4 in the present application can be provided in plurality along the outside of the thermal insulation sleeve 2 according to the size and requirements of the rotary kiln, and are not limited to the two provided in the present embodiment, so as to further improve the sealing performance of the device.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A sealing device for a rotary kiln, the rotary kiln comprising a kiln body (1), a heat insulating sleeve (2) and a kiln head and kiln tail cover (5), the sealing device comprising a sealing assembly (4), characterized in that: The kiln head and kiln tail hoods (5) are connected to both ends of the kiln body (1); the heat insulating sleeve (2) is sleeved on the kiln body (1) connected to the kiln head and kiln tail hoods (5); the inner cavity of the kiln body (1) is communicated with the interior of the kiln head and kiln tail hoods (5); the sealing component (4) is installed at the connection between the kiln head and kiln tail hoods (5) and the kiln body (1), and sleeved on the outside of the heat insulating sleeve (2) to achieve sealing between the kiln body (1) and the kiln head and kiln tail hoods (5); The sealing assembly (4) comprises a sealer fixing plate (12), wherein the sealer fixing plate (12) is mounted on the kiln head and kiln tail covers (5) and pressed against the outside of the thermal insulation sleeve (2), and a sealable air-sealing air inlet (11) is provided on the sealer fixing plate (12), and an air-sealing chamber (16) is provided on the inner diameter thereof, wherein the air-sealing air inlet (11) is connected to the air-sealing chamber (16), and the gas pressure in the air-sealing chamber (16) is greater than the working pressure in the kiln.

2. The sealing device for a rotary kiln according to claim 1, characterized in that: The sealing assembly (4) further comprises an inner sealing chamber (17) and an outer sealing chamber (18), wherein the inner sealing chamber (17) and the outer sealing chamber (18) are arranged on the contact surface between the sealer fixing plate (12) and the heat insulating sleeve (2), the air sealing chamber (16) is between the inner sealing chamber (17) and the outer sealing chamber (18), the outer sealing chamber (18) is arranged on the side of the air sealing chamber (16) facing outside the kiln, and the inner sealing chamber (17) is arranged on the side of the air sealing chamber (16) facing inside the kiln.

3. The sealing device of a rotary kiln according to claim 2, characterized in that: A sealing packing (15) is arranged in the inner sealing chamber (17), and a packing pressing block (13) is also arranged on one side of the sealing packing (15). The sealing packing (15) is pressed by the packing pressing block (13).

4. The sealing device for a rotary kiln according to claim 3, characterized in that: The packing pressing block (13) is an L-shaped structure. One end of the packing pressing block (13) extends into the inner sealing chamber (17) for pressing the sealing packing (15). A bolt hole is arranged at the other end. A bolt hole is also arranged at a relative position of the sealer fixing plate (12). The packing pressing block (13) and the sealing packing (15) are connected through the two bolt holes by a fastening bolt (14).

5. The sealing device for a rotary kiln according to claim 2, characterized in that: An outer sealing ring (8), a pressure ring (9) and an inner sealing ring (10) are arranged in the outer sealing chamber (18), and all three are sleeved on the outside of the thermal insulation sleeve (2). The inner sealing ring (10) is arranged adjacent to the gas sealing chamber (16), and the outer sealing ring (8) is adjacent to the outside. The pressure ring (9) is installed between the outer sealing ring (8) and the inner sealing ring (10).

6. The sealing device for a rotary kiln according to claim 5, characterized in that: A sealing ring pressing block (6) is arranged outside the outer sealing ring (8).

7. The sealing device of a rotary kiln according to claim 6, characterized in that: The sealing ring pressing block (6) can be an L-shaped structure, one end of the sealing ring pressing block (6) extends into the outer sealing chamber (18) for pressing the outer sealing ring (8), and the other end is provided with a bolt hole. A bolt hole is also provided at a relative position of the sealer fixing plate (12), and a fastening bolt (7) connects the sealing ring pressing block (6) and the outer sealing ring (8) through the two bolt holes.

8. The sealing device for a rotary kiln according to claim 1, characterized in that: The heat insulation sleeve (2) is welded to the kiln body (1), and the internal space of the heat insulation sleeve (2) is filled with heat insulation cotton (3).

9. The sealing device for a rotary kiln according to claim 1, characterized in that: The gas in the gas sealing chamber (16) is an inert gas.

10. The sealing device of a rotary kiln according to claim 1, characterized in that: The sealing components (4) may be arranged in plurality along the exterior of the heat insulating sleeves (2) at both ends of the kiln body (1).

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