Rotary drum sealing system, and drying device

Abstract

A rotary drum sealing system and a drying device. The rotary drum sealing system comprises a first sealing component (1) and a second sealing component (2), wherein one of the two sealing components is formed on an inner side wall of a housing (100) of the drying device, and the other of the two sealing components is sleeved on a rotary drum (200) and rotates together with the rotary drum (200); and the second sealing component (2) can be tightly attached to the surface of the first sealing component (1) and cooperates with the first sealing component (1) to form dynamic seal. The rotary drum sealing system can effectively seal a gap between the inner side wall of the housing (100) of the drying device and an outer peripheral side of the rotary drum (200), thereby preventing gases, before and after drying of rotary drum, from leaking to each other, thus ensuring the quality of dried gas, and improving the performance of the drying device.

Description

A rotary drum sealing system and drying device Technical Field

[0001] The present application relates to the technical field of gas post-processing, and in particular to a rotary drum sealing system and a drying device. Background Art

[0002] A rotary drum dryer generally consists of a housing and a drum, which is located within a chamber within the housing. During the drying process, the drum rotates continuously to dry the gas and regenerate the drum. Wet air to be dried enters the dryer's intake chamber, and the dry gas, dried by the drum, enters the dryer's gas collection chamber. Because the drum rotates during operation, a gap exists between its outer circumference and the inner wall of the dryer's housing. Gas before and after drum drying passes through this gap into the other chamber. Undried gas entering the gas collection chamber can affect the quality of the dried gas, while dry gas entering the intake chamber can waste the dried gas and reduce system energy efficiency.

[0003] Utility Model Content

[0004] To address at least one of the above-mentioned technical problems existing in the prior art, an embodiment of the present application provides a drum sealing system.

[0005] The technical solution adopted in the embodiment of the present application is: a rotary drum sealing system, used in a drying device, the rotary drum sealing system includes a first sealing component and a second sealing component, one of the two sealing components is formed on the inner side wall of the shell of the drying device, and the other is sleeved on the rotary drum and rotates with the rotary drum, and the second sealing component can fit tightly to the surface of the first sealing component and cooperate with the first sealing component to form a dynamic seal.

[0006] In an optional embodiment, the first sealing component includes an annular plate, which is arranged around the drum and fixed to the inner wall of the shell, and the lower plate surface of the annular plate is used to tightly fit with the second sealing component to form a dynamic seal.

[0007] In an optional embodiment, the outer peripheral side of the annular plate is fixedly connected to the inner side wall of the shell, or the annular plate and the shell of the drying device are an integrated structure.

[0008] In an optional embodiment, the second sealing component is tightly fitted to the inner side wall of the housing, and the corresponding surfaces where the inner side wall of the housing and the second sealing component are tightly fitted form the first sealing component.

[0009] In an optional embodiment, the second sealing component is sleeved on the drum and fits tightly against the inner wall of the shell. The corresponding surfaces of the inner wall of the shell and the second sealing component that fit tightly against each other are processed to form a sealing layer and / or a lubricating layer. The sealing layer and / or the lubricating layer form the first sealing component.

[0010] In an optional embodiment, the second sealing component is fixed to the inner side wall of the shell of the drying device and is tightly fitted with the outer peripheral surface of the drum. The corresponding outer peripheral surface of the drum tightly fitted with the second sealing component forms the first sealing component.

[0011] In an optional embodiment, the second sealing component is fixed to the inner side wall of the shell of the drying device and is tightly fitted with the outer peripheral surface of the rotating drum. The corresponding outer peripheral surface of the rotating drum that is tightly fitted with the second sealing component is processed to form a sealing layer and / or a lubricating layer, and the sealing layer and / or the lubricating layer form the first sealing component.

[0012] In an optional embodiment, the shell of the drying device includes an upper shell and a lower shell, one of the first sealing component and the second sealing component is provided on the upper shell, and the other is provided on the part of the rotating drum corresponding to the upper shell; or, one of the first sealing component and the second sealing component is provided on the lower shell, and the other is provided on the part of the rotating drum corresponding to the lower shell.

[0013] In an optional embodiment, the second sealing component includes a main body and a lip portion extending from the main body toward the first sealing component, the main body is tightly mounted on the outer peripheral wall of the drum or fixed to the inner wall of the shell, and the lip portion is tightly fitted on the first sealing component to form a dynamic seal.

[0014] In an optional embodiment, the cross-section of the main body is annular, the lip portion is formed by extending an end face of the main body in the axial direction toward the first sealing component, and an annular groove is formed between the end face of the main body and the lip portion.

[0015] In an optional embodiment, the drum sealing system further includes a third sealing component provided on the outer peripheral side of the annular plate.

[0016] In an optional embodiment, a first annular groove is provided on the shell, the third sealing component is located in the first annular groove, and the lower plate surface of the annular plate close to its outer peripheral side is pressed against the third sealing component, thereby achieving sealing between the annular plate and the shell.

[0017] In an optional embodiment, the housing of the drying device includes an upper housing and a lower housing, and the drum sealing system further includes at least one fourth sealing component provided between end surfaces of the upper housing and the lower housing.

[0018] In an optional embodiment, at least one second annular groove is provided on the end face of the upper shell and / or the lower shell, and the fourth sealing component is pressed into the second annular groove by the other end face of the upper shell and / or the lower shell, thereby achieving sealing between the upper and lower shells.

[0019] An embodiment of the present application also provides a drying device, including a shell, a drum and a driving mechanism for driving the drum to rotate. A cavity is formed in the shell, and the drum is arranged in the cavity. The drying device also includes the drum sealing system of any of the above embodiments.

[0020] Compared with the prior art, the beneficial effect of the embodiments of the present application is that the drum sealing system of the present application can effectively seal the annular gap between the inner side wall of the shell of the drying device and the outer peripheral side of the drum, thereby ensuring the quality of the gas after drying and improving the performance of the drying device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. The drawings illustrate various embodiments generally by way of example and not limitation, and together with the description and claims, serve to illustrate the disclosed embodiments. Where appropriate, like reference numerals are used throughout the drawings to refer to like or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive of the embodiments of the present apparatus or method.

[0022] FIG1 is a schematic cross-sectional view of a drying device according to an embodiment of the present application.

[0023] 2 to 7 are schematic diagrams of partial structures of different embodiments of part A in FIG1 .

[0024] Figure numerals: 1-first sealing component; 2-second sealing component; 21-main body; 22-lip edge; 23-annular groove; 3-third sealing component; 4-fourth sealing component; 5-first annular groove; 6-second annular groove; 100-shell; 101-upper shell; 1011-installation groove; 102-lower shell; 200-drum; 300-air inlet chamber; 400-air collecting chamber; 500-annular gap. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] Unless otherwise defined, the technical or scientific terms used in this application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0027] In order to keep the following description of the embodiments of the present application clear and concise, detailed descriptions of known functions and known components are omitted in this application.

[0028] The present invention provides a rotary drum sealing system for use in a drying device capable of drying fluids such as compressed air. As shown in Figure 1 , the drying device comprises a housing 100 and a rotary drum 200. The rotary drum 200 is disposed within the housing 100 and divides the space within the housing 100 into a drum-containing space, an air intake chamber 300, and an air collection chamber 400. An annular gap 500 is defined between the outer circumferential wall of the rotary drum 200 and the inner sidewall of the housing 100, enabling the rotary drum 200 to rotate smoothly within the housing 100.

[0029] As shown in Figures 2 to 7 , the rotary drum sealing system of the present embodiment includes a first sealing component 1 and a second sealing component 2. One of the two sealing components is formed on the inner wall of the drying device housing 100, while the other is sleeved on the rotary drum 200 and rotates with the drum 200. The second sealing component 2 is able to closely adhere to the surface of the first sealing component 1 and cooperate with the first sealing component 1 to form a dynamic seal.

[0030] The rotary drum sealing system of the present embodiment prevents gas leakage between the inlet chamber 300 and the gas collecting chamber 400 through the annular gap 500, thus preventing wet gas from the gas collecting chamber 400 from mixing with the dry gas in the inlet chamber 300 and affecting the quality of the dry gas. Furthermore, because the second sealing component 2 forms a dynamic seal with the first sealing component 1, the normal rotation of the rotary drum 200 is not affected while achieving a seal.

[0031] In some embodiments, as shown in Figures 2 and 3, a first sealing component 1 is disposed around the drum 200 and fixed to the inner sidewall of the housing 100, facilitating assembly and maintenance. The first sealing component 1 has a simple and rational structure, easily cooperating with the second sealing component 2 to form a sealed isolation zone within the annular gap 500, thereby isolating the gas in the air intake chamber 300 from the gas in the gas collecting chamber 400 from leaking out.

[0032] Furthermore, the first sealing component 1 includes an annular plate, which is arranged around the drum 200 and fixed to the inner wall of the shell 100. The lower plate surface of the annular plate is used to fit tightly with the second sealing component 2 to form a dynamic seal. The air pressure in the air intake chamber 300 is slightly greater than the air pressure in the air collecting chamber 400. The second sealing component 2 is affected by the air pressure in the upper and lower directions and fits more tightly against the lower plate surface of the annular plate. The roughness of the dynamic sealing surface can be set according to needs or the sealing requirements to be achieved. By setting the dynamic sealing surface, the sealing area and sealing effect can be guaranteed, thereby improving the sealing performance.

[0033] In some embodiments, the annular plate and the drying device housing 100 may be separate components, that is, the annular plate is a separate component from the housing 100 (see Figure 2 ). The outer periphery of the annular plate can be secured to the inner sidewall of the housing 100, for example, by clamping. If the annular plate becomes severely worn, affecting its sealing performance, it can be removed and replaced separately, facilitating subsequent maintenance. In some embodiments, the annular plate and the drying device housing 100 may also be integrally formed (see Figure 3 ).

[0034] In some embodiments, as shown in Figures 4 and 5, the second sealing component 2 is sleeved on the rotating drum 200 and forms a seal with the rotating drum 200. The second sealing component 2 is tightly fitted with the inner wall of the housing 100, and the corresponding surfaces of the inner wall of the housing 100 and the second sealing component 2 tightly fitted together form the first sealing component 1.

[0035] In some embodiments, as further shown in Figures 4 and 5 , the second sealing component 2 is sleeved on the rotating drum 200 and forms a seal with the rotating drum 200. The second sealing component 2 is tightly fitted to the inner wall of the housing 100, and the corresponding surfaces of the inner wall of the housing 100 where the second sealing component 2 is tightly fitted are machined to form a sealing layer and / or a lubricating layer, which forms the first sealing component 1.

[0036] In some embodiments, as shown in Figures 6 and 7, the second sealing component 2 is fixed to the inner wall of the shell 100 of the drying device and is tightly fitted with the outer peripheral surface of the drum 200. The corresponding outer peripheral surface of the drum 200 tightly fitted with the second sealing component 2 forms the first sealing component 1.

[0037] In some embodiments, continuing with Figures 6 and 7, the second sealing component 2 is fixed to the inner wall of the shell 100 of the drying device and is tightly fitted with the outer peripheral surface of the drum 200. The corresponding outer peripheral surface of the drum 200 that is tightly fitted with the second sealing component 2 is processed to form a sealing layer and / or a lubricating layer, and the sealing layer and / or the lubricating layer form the first sealing component 1.

[0038] In this way, the annular plate can be omitted, simplifying the structure while maintaining the sealing effect and reducing assembly time.

[0039] In some embodiments, as shown in Figures 2 to 7 , second sealing component 2 includes a main body 21 and a lip 22 extending from main body 21 toward first sealing component 1. Main body 21 is tightly fitted around the outer circumferential wall of rotating drum 200 or fixed to the inner sidewall of housing 100, while the lip 22 closely adheres to first sealing component 1 to form a dynamic seal. Main body 21 secures second sealing component 2 to rotating drum 200 or housing 100, while lip 22 provides a dynamic seal with first sealing component 1. This results in a simple and rational structure and excellent sealing performance.

[0040] Specifically, the second sealing component 2 can be made of a deformable elastic material, such as rubber. In some embodiments, the main body 21 can be a sleeve structure with a circular cross-section. The sleeve structure is tightly fitted onto the cylindrical drum 200 through elastic force to achieve a seal with the drum 200. Alternatively, the outer peripheral wall of the sleeve structure is tightly fixed to the inner peripheral wall of the housing 100 to achieve a seal with the housing 100. The lip portion 22 is formed by extending an axial end surface of the sleeve structure toward the first sealing component 1, so that the cross-section of the lip portion 22 (the cross-section perpendicular to the axis of the drum 200) is annular.

[0041] Furthermore, as shown in Figures 2 to 7 , an annular groove 23 is formed between the lip portion 22 and the end surface of the main body 21 to which it is connected. This allows the lip portion 22 to form a shape that gradually expands outward relative to the main body 21, extending close to the first sealing component 1 and tightly fitting therewith to form a dynamic seal. The provision of the annular groove 23 facilitates the deformation of the lip portion 22, thereby better fitting it against the first sealing component 1 and enhancing the sealing effect.

[0042] In some embodiments, as shown in Figures 2 to 7 , the housing 100 of the drying device includes an upper housing 101 and a lower housing 102. The drum sealing system further includes a sealing structure disposed between the upper housing 101 and the lower housing 102. The sealing structure is used to seal between the upper and lower housings to prevent gas within the housing 100 from leaking to the outside through the gap between the upper and lower housings, thereby wasting gas.

[0043] When the shell 100 includes an upper shell 101 and a lower shell 102, and the first sealing component 1 includes an annular plate, the outer periphery of the annular plate can be clamped between the upper shell 101 and the lower shell 102; or, the annular plate and the upper shell 101 are an integral structure, or the annular plate and the lower shell 102 are an integral structure.

[0044] Furthermore, as shown in Figures 2 and 3, the second sealing component 2 is sleeved onto the portion of the drum corresponding to the lower housing 102, facilitating the interaction between the second sealing component 2 and the lower surface of the annular plate to form a dynamic seal. The lip portion 22 of the second sealing component 2 is formed by extending the inner peripheral edge of the upper end surface of the main body 21 toward the first sealing component 1. The upper end surface of the main body 21 is recessed downward near the location where it connects to the lip portion 22 to form an annular groove 23.

[0045] In some embodiments, the drum sealing system further includes a third sealing component 3. As shown in FIG2 , the third sealing component 3 is disposed on the outer periphery of the annular plate and is used to seal between the annular plate and the housing 100 of the drying device, thereby preventing gas in the air inlet chamber 300 and gas in the air collecting chamber 400 from leaking at the connection between the first sealing component 1 and the housing 100.

[0046] For example, as shown in FIG2 , a first annular groove 5 is provided on the housing 100, and the third sealing component 3 is a sealing ring and is embedded in the first annular groove 5. The first sealing component 1 is an annular plate, and the plate surface of the annular plate near its outer circumference presses against the third sealing component 3, thereby achieving a seal between the annular plate and the housing 100. It is understandable that the first annular groove 5 can be provided on the lower end surface of the upper housing 101 or on the upper end surface of the lower housing 102. When the first annular groove 5 is provided on the lower end surface of the upper housing 101, the upper plate surface of the annular plate near its outer circumference presses against the third sealing component 3. When the first annular groove 5 is provided on the upper end surface of the lower housing 102, the lower plate surface of the annular plate near its outer circumference presses against the third sealing component 3. The third sealing component 3 can also adopt other sealing structures in the prior art.

[0047] When the housing of the drying device includes an upper housing 101 and a lower housing 102, one of the first sealing component 1 and the second sealing component 2 is provided on the upper housing 101, and the other is provided on the portion of the rotating drum 200 corresponding to the upper housing 101; alternatively, one of the first sealing component 1 and the second sealing component 2 is provided on the lower housing 102, and the other is provided on the portion of the rotating drum 200 corresponding to the lower housing 102. This allows the two sealing components to be closer together, thereby improving sealing performance.

[0048] For example, as shown in Figure 4, the main body 21 of the second sealing component 2 is tightly mounted on the portion of the drum 200 corresponding to the lower shell 102. The first sealing component 1 is formed on the inner wall surface of the lower shell 102. The lip portion 22 of the second sealing component 2 is formed by extending the portion of the lower end surface of the main body 21 close to its outer periphery toward the first sealing component 1 of the lower shell 102, and the free end of the lip portion 22 is formed with a sealing surface extending in the vertical direction of the first sealing component 1, so that the lip portion 22 can not only form a dynamic seal with the first sealing component 1 on the lower shell 102, but also increase the sealing area to ensure the sealing effect. In addition, an annular groove 23 is provided on the lower end surface of the main body 21 to enhance the deformation ability of the lip portion 22.

[0049] For example, as shown in Figure 5, the main body 21 of the second sealing component 2 is tightly mounted on the portion of the drum 200 corresponding to the upper shell 101. The first sealing component 1 is formed on the inner wall surface of the upper shell 101. The lip portion 22 of the second sealing component 2 is formed by extending the portion of the lower end surface of the main body 21 close to its outer periphery toward the upper shell 101, and the free end of the lip portion 22 is formed with a sealing surface extending in the vertical direction of the first sealing component 1, so that the lip portion 22 can not only form a dynamic seal with the first sealing component 1 on the upper shell 101, but also increase the sealing area to ensure the sealing effect. In addition, an annular groove 23 is provided on the lower end surface of the main body 21 to enhance the deformation ability of the lip portion 22.

[0050] For example, as shown in Figure 6, the main body 21 of the second sealing component 2 is tightly fixed to the inner wall surface of the lower shell 102. The first sealing component 1 is formed on the outer peripheral wall of the portion of the lower shell 102 corresponding to the drum 200. The lip portion 22 of the second sealing component 2 is formed by the portion of the lower end surface of the main body 21 close to its inner peripheral edge extending toward the drum 200, and the free end of the lip portion 22 is formed with a sealing surface extending in the vertical direction of the first sealing component 1, so that the lip portion 22 can not only form a dynamic seal with the first sealing component 1 formed on the drum 200, but also increase the sealing area to ensure the sealing effect. In addition, an annular groove 23 is provided on the lower end surface of the main body 21 to enhance the deformation ability of the lip portion 22.

[0051] Furthermore, as shown in Figure 6, a mounting groove is provided on the inner wall of the lower housing 102, extending through the upper end surface of the lower housing 102 (the mounting groove is not shown because it is obscured by the main body 21). The main body 21 of the second sealing component 2 is embedded in the mounting groove. The lower end surface of the main body 21 abuts against the lower wall of the mounting groove. The provision of the mounting groove improves the stability of the second sealing component 2 fixed to the housing 100.

[0052] For example, as shown in Figure 7, the main body 21 of the second sealing component 2 is tightly fixed to the inner wall surface of the upper shell 101. The first sealing component 1 is formed on the outer peripheral wall of the portion of the upper shell 101 corresponding to the drum 200. The lip portion 22 of the second sealing component 2 is formed by the portion of the lower end surface of the main body 21 close to its inner peripheral edge extending toward the drum 200, and the free end of the lip portion 22 is formed with a sealing surface extending in the vertical direction of the first sealing component 1, so that the lip portion 22 can not only form a dynamic seal with the first sealing component 1 formed on the drum 200, but also increase the sealing area to ensure the sealing effect. In addition, an annular groove 23 is provided on the lower end surface of the main body 21 to enhance the deformation ability of the lip portion 22.

[0053] Furthermore, as shown in Figure 7, a mounting groove 1011 is provided on the inner wall of the upper housing 101, extending through the lower end surface of the upper housing 101. The main body 21 of the second sealing component 2 is embedded in the mounting groove 1011. The upper end surface of the main body 21 abuts against the upper wall of the mounting groove 1011. The provision of the mounting groove 1011 improves the stability of the second sealing component 2 fixed to the housing 100.

[0054] It is understood that when the first sealing component 1 is formed on the housing 100, it forms a ring around the inner wall of the housing 100; when the first sealing component 1 is formed on the drum 200, it forms a ring around the outer circumference of the drum 200, thus forming an annular seal to ensure the sealing of the entire annular gap 500 between the drum 200 and the housing 100. In some embodiments, as shown in Figures 2 to 7, the drum sealing system also includes at least one fourth sealing component 4 disposed between the end surfaces of the upper housing 101 and the lower housing 102. The fourth sealing component 4 is annular and can be an annular sealing ring or an annular sealing gasket. Exemplarily, the fourth sealing component 4 is a rubber sealing ring or a graphite sealing gasket.

[0055] For example, when the fourth sealing component 4 is a sealing ring, a second annular groove 6 can be provided on the upper end surface of the lower shell 102 and / or the lower end surface of the upper shell 101. The sealing ring is embedded in the second annular groove 6 and protrudes upward from the upper end surface of the lower shell 102 or the lower end surface of the upper shell 101. The lower end surface of the upper shell 101 is butted against the upper end surface of the lower shell 102 and connected via fasteners, so that the lower end surface of the upper shell 101 or the upper end surface of the lower shell 102 abuts against the sealing ring, and downward pressure is applied to the sealing ring to achieve a seal between the upper and lower shells.

[0056] In some embodiments, the third sealing component 3 is also annular and concentric with the fourth sealing component 4, and the fourth sealing component 4 is located on the outside of the third sealing component 3, thereby ensuring the sealing of the entire annular gap 500 between the drum 200 and the shell 100, and achieving sealing between the upper and lower shells.

[0057] It is understood that the number of fourth sealing components 4 and second annular grooves 6 provided is not limited. For example, a single fourth sealing component 4 as shown in Figures 2 and 3 may be provided, or two or more fourth sealing components 4 may be provided to form a multi-stage seal and enhance the sealing effect. When multiple fourth sealing components 4 are provided, the multiple fourth sealing components 4 are arranged sequentially from the inside to the outside, and the multiple fourth sealing components 4 are concentric.

[0058] The present application also provides a drying device. As shown in Figure 1, the drying device includes a housing 100, a rotating drum 200, and a drive mechanism for rotating the rotating drum 200. The housing defines a cavity, and the rotating drum 200 is disposed within the cavity. The drying device also includes the drum sealing system described in any of the above embodiments.

[0059] The drying device of one embodiment of the present application can be used to dry compressed air. The drying device of the embodiment of the present application is provided with a drum sealing system to ensure that the gases before and after drying do not leak into each other in the annular gap 500 when the drum 200 rotates continuously, thereby improving the quality of the dried gas.

[0060] The above embodiments are merely exemplary embodiments of the present application and are not intended to limit the scope of the present application. The scope of protection of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and scope of protection of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present application.

Claims

1. A drum sealing system for use in a drying device, characterized in that: The drum sealing system includes a first sealing component and a second sealing component, one of the two sealing components is formed on the inner side wall of the shell of the drying device, and the other is sleeved on the drum and rotates with the drum. The second sealing component can fit tightly to the surface of the first sealing component and cooperate with the first sealing component to form a dynamic seal.

2. The drum sealing system according to claim 1, characterized in that: The first sealing component is arranged around the rotating drum and fixed on the inner side wall of the shell.

3. The drum sealing system according to claim 2, characterized in that: The first sealing component includes an annular plate, the lower plate surface of which is used to fit tightly with the second sealing component to form a dynamic seal; the outer peripheral side of the annular plate is fixedly connected to the inner wall of the shell, or the annular plate and the shell of the drying device are an integrated structure.

4. The drum sealing system according to claim 1, characterized in that: The second sealing component is tightly fitted with the inner side wall of the housing, and the corresponding surfaces where the inner side wall of the housing and the second sealing component are tightly fitted form the first sealing component.

5. The drum sealing system according to claim 1, characterized in that: The second sealing component is sleeved on the drum and fits tightly with the inner wall of the shell. The corresponding surfaces of the inner wall of the shell and the second sealing component that fit tightly are processed to form a sealing layer and / or a lubricating layer. The sealing layer and / or the lubricating layer form the first sealing component.

6. The drum sealing system according to claim 1, characterized in that: The second sealing component is fixed to the inner side wall of the shell of the drying device and is tightly fitted with the outer peripheral surface of the rotating drum. The corresponding outer peripheral surface of the rotating drum tightly fitted with the second sealing component forms the first sealing component.

7. The drum sealing system according to claim 1, characterized in that: The second sealing component is fixed on the inner wall of the shell of the drying device and is tightly fitted with the outer circumferential surface of the drum. The corresponding outer circumferential surface of the drum tightly fitted with the second sealing component is processed to form a sealing layer and / or a lubricating layer, and the sealing layer and / or the lubricating layer form the first sealing component.

8. The drum sealing system according to claim 1, characterized in that: The shell of the drying device includes an upper shell and a lower shell, one of the first sealing component and the second sealing component is arranged on the upper shell, and the other is arranged on the part of the rotating drum corresponding to the upper shell; or, one of the first sealing component and the second sealing component is arranged on the lower shell, and the other is arranged on the part of the rotating drum corresponding to the lower shell.

9. The drum sealing system according to any one of claims 1 to 8, characterized in that: The second sealing component includes a main body and a lip portion extending from the main body toward the first sealing component. The main body is tightly sleeved on the outer peripheral wall of the drum or fixed to the inner side wall of the shell, and the lip portion is tightly fitted on the first sealing component to form a dynamic seal.

10. The drum sealing system according to claim 9, characterized in that: The cross section of the main body is annular, the lip portion is formed by extending one end surface of the main body in the axial direction toward the first sealing component, and an annular groove is formed between the one end surface of the main body and the lip portion.

11. The drum sealing system according to claim 3, characterized in that: The drum sealing system further includes a third sealing component disposed on the outer peripheral side of the annular plate.

12. The drum sealing system according to claim 11, characterized in that: The shell is provided with a first annular groove, the third sealing component is located in the first annular groove, and the lower plate surface of the annular plate close to its outer peripheral side is pressed against the third sealing component, thereby achieving sealing between the annular plate and the shell.

13. The drum sealing system according to claim 9, characterized in that: The housing of the drying device includes an upper housing and a lower housing, and the drum sealing system further includes at least one fourth sealing component arranged between end surfaces of the upper housing and the lower housing.

14. The drum sealing system according to claim 13, characterized in that: The end surface of the upper shell and / or the lower shell is provided with at least one second annular groove, and the fourth sealing component is pressed in the second annular groove by the other end surface of the upper shell and / or the lower shell, thereby achieving sealing between the upper and lower shells.

15. A drying device, comprising a housing, a drum and a driving mechanism for driving the drum to rotate, wherein a cavity is formed in the housing, and the drum is disposed in the cavity, wherein: The drying device further comprises a drum sealing system according to any one of claims 1 to 14.

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