Hot air door shaft sealing device

Abstract

The utility model discloses a hot air door shaft sealing device, and belongs to the technical field of shaft sealing. The sealing device comprises a dynamic sealing sleeve and a static sealing sleeve which are sleeved inside and outside, wherein a sealing assembly is arranged between the dynamic sealing sleeve and the static sealing sleeve; the sealing assembly comprises an elastic piece, a first sealing ring and a shaft sleeve which are sequentially arranged on the movable sealing sleeve in a sleeving mode from top to bottom. The outer circumferential wall of the movable sealing sleeve and the inner circumferential wall of the static sealing sleeve are each provided with an annular table, the first sealing ring is located above the annular tables, the shaft sleeve is located below the annular tables, and a steering channel is formed between the first sealing ring and the shaft sleeve. The steering channel is used for converting axial sealing at the peripheral wall of the dynamic sealing sleeve into plane sealing at an air outlet of the steering channel, and the air outlet of the steering channel is arranged far away from an axial sealing surface between the shaft sleeve and the dynamic sealing sleeve; the first sealing ring is a high-temperature-resistant metal sealing ring, and the metal sealing ring conducts elastic compensation through the extrusion elastic force of the elastic piece.

Description

Technical Field

[0001] This utility model belongs to the field of shaft sealing technology, and more specifically, relates to a hot air door shaft sealing device. Background Technology

[0002] In the production process of thermal power plants, pulverized coal, after being ground and shaped, is carried into the furnace for combustion by hot air. Throughout the hot air system, there are numerous hot air valves, including hot air regulating valves and hot air shut-off valves. The temperature of hot air and hot ash within the hot air ducts of thermal power plants can reach over 300℃. To ensure the safe and stable operation of the system, it is essential to ensure that the hot air valve shaft sealing devices have a good sealing effect to prevent hot air and hot ash leakage, thus preventing damage to surrounding equipment and personnel from leaked hot air and hot ash.

[0003] Currently, the most common sealing method used in hot air damper shaft sealing devices is the use of high-temperature resistant sealing packing. Because the damper shaft is exposed to hot air at high temperature and pressure, and the packing has poor elasticity, coupled with the tendency for the shaft to become eccentric during operation, problems such as hot air and coal ash leakage frequently occur. This leakage problem becomes particularly pronounced after the damper has been operating frequently for a long time. Therefore, designing a damper shaft sealing device with excellent sealing performance is of significant practical importance in production.

[0004] A search revealed patent CN201866399 U, which discloses a high-temperature hot air door shaft sealing device. This application introduces high-pressure cold air into the inner cavity of the sleeve, with the pressure of the cold air slightly exceeding the pressure of the hot air inside the hot air duct, to prevent the hot air inside the hot air duct from diffusing to the outside through the packing, thus avoiding the problem of coal dust leakage. Essentially, this application still utilizes packing for sealing, and similarly suffers from the problem of poor elasticity compensation in the packing seal.

[0005] For example, patent CN111059347A discloses a hot air regulating door shaft sealing device. In this application, the seal employs a segmented sealing structure based on temperature. The highest temperature is at the shaft sleeve seal, using a soft metal seal; the next highest temperature is at the inorganic high-temperature seal, using an inorganic material; and the lowest temperature is at the organic high-temperature seal, using an organic elastic material. This results in excellent sealing performance, maintaining axial airtightness and preventing axial leakage. While this application effectively improves axial sealing performance through the combination of three seals with different temperature resistance properties, in actual production, it was found that the organic seal's poor high-temperature resistance remains a significant issue. Furthermore, because the expansion coefficient of the soft metal seal is greater than that of the door shaft, gaps will appear between them after high-temperature expansion, easily leading to seal failure. Utility Model Content

[0006] 1. The problem to be solved

[0007] In view of the poor sealing performance of the hot air damper shaft in the existing technology, which easily leads to air and coal leakage, this utility model provides a hot air damper shaft sealing device. By changing the axial sealing of the hot air damper shaft to the planar sealing at the end of the sealing sleeve, and then using an elastic element to elastically compensate the metal sealing element at the planar sealing, the requirements of high temperature resistance sealing and elastic compensation performance are met.

[0008] 2. Technical Solution

[0009] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0010] This utility model discloses a hot air damper shaft sealing device, comprising a dynamic sealing sleeve and a static sealing sleeve arranged inner and outer, with a sealing assembly installed between the dynamic and static sealing sleeves; the sealing assembly includes, from top to bottom, an elastic element, a first sealing ring, and a shaft sleeve, sequentially fitted onto the dynamic sealing sleeve; wherein...

[0011] The outer peripheral wall of the dynamic sealing sleeve and the inner peripheral wall of the static sealing sleeve are each provided with an annular platform. The first sealing ring is located above the annular platform, and the bushing is located below the annular platform, forming a turning channel between the first sealing ring and the bushing.

[0012] The steering channel is used to convert the axial seal at the outer peripheral wall of the dynamic sealing sleeve into a planar seal at the air outlet of the steering channel; the air outlet of the steering channel is set away from the axial sealing surface between the bushing and the dynamic sealing sleeve, and the direction of away is along the radial direction of the bushing.

[0013] The first sealing ring is a metal sealing ring, which is elastically compensated by the compressive force of the elastic element.

[0014] In some embodiments, the static sealing sleeve is provided with a first annular platform inside, and the dynamic sealing sleeve is provided with a second annular platform outside; wherein, the upper surfaces of the first annular platform and the second annular platform are aligned, and the lower surface of the first annular platform is lower than the lower surface of the second annular platform.

[0015] The first ring platform, the second ring platform, the first sealing ring, and the bushing form an L-shaped steering channel, and the air outlet of the steering channel is located between the two ring platforms.

[0016] In some embodiments, the bushing is a metal sleeve, and the coefficient of expansion of the metal sleeve is greater than that of the dynamic sealing sleeve. Under the action of high-temperature hot air, a gap is formed between the bushing and the dynamic sealing sleeve, and the gap is connected to the air inlet of the diversion channel.

[0017] In some embodiments, the bushing is a copper-graphite alloy bushing.

[0018] In some embodiments, the inner wall of the bushing has an annular air storage space, which introduces sealing air through a ventilation pipe; the bushing and the static sealing sleeve have through holes through which the ventilation pipe passes.

[0019] In some embodiments, the bottom of the dynamic sealing sleeve is provided with a third annular platform, and a second sealing ring is provided between the third annular platform and the bushing.

[0020] In some embodiments, the outer peripheral wall of the bushing is provided with a limiting ring groove for the second sealing ring to be inserted, and the second sealing ring is a metal ring.

[0021] In some embodiments, the dynamic sealing sleeve is provided with a second through hole for connecting the gas storage space and the inner cavity of the dynamic sealing sleeve.

[0022] In some embodiments, both the static sealing sleeve and the dynamic sealing sleeve are of a split structure, and the through holes on the dynamic and static sealing sleeves are located between two mutually mating split surfaces.

[0023] In some embodiments, the top of the static sealing sleeve is provided with a pressure cap, which is bolted to or integrally formed with the static sealing sleeve; the elastic element is confined between the pressure cap and the first sealing ring.

[0024] This utility model discloses a hot air damper shaft sealing device, comprising,

[0025] A dynamic sealing sleeve is fixedly sleeved on the door hinge. The dynamic sealing sleeve moves synchronously with the door hinge, and the two are in sealed contact.

[0026] A static sealing sleeve is installed on the base of the stuffing chamber, and the static sealing sleeve is sleeved on the outside of the dynamic sealing sleeve, with an installation space between the two.

[0027] and a sealing assembly disposed within the installation space; wherein,

[0028] The sealing assembly includes, from top to bottom, an elastic element, a first sealing ring, and a bushing, which are sequentially fitted onto the dynamic sealing sleeve.

[0029] A steering channel is formed between the first sealing ring and the bushing; there is a certain distance between the air outlet of the steering channel and the inner wall of the bushing, which is used to convert the axial seal between the dynamic sealing sleeve and the bushing into a planar seal between the first sealing ring and the air outlet of the steering channel; and the first sealing ring is elastically compensated by the extrusion force of the elastic element.

[0030] 3. Beneficial effects

[0031] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0032] (1) The hot air door shaft sealing device of this utility model, when working, is fixedly sleeved on the door shaft by the dynamic sealing sleeve, which can change the axial seal between the dynamic sealing sleeve and the door shaft to the axial seal between the dynamic sealing sleeve and the static sealing sleeve, thereby reducing the frictional wear of the door shaft and extending the service life of the door shaft; then, by setting the turning channel, the axial seal between the dynamic sealing sleeve and the static sealing sleeve can be changed to the planar seal at the outlet of the turning channel; at this time, for high temperature environment, a metal sealing ring can be used as the sealing element for the planar seal at the outlet of the turning channel; at the same time, the compression elastic force of the elastic element can be used to elastically compensate the metal sealing ring, thereby taking into account both high temperature resistance and elastic compensation performance, so as to improve the axial sealing performance under high temperature conditions.

[0033] (2) The hot air door shaft sealing device of this utility model uses a copper-graphite alloy sleeve for the shaft sleeve. Under normal temperature conditions, the copper-graphite alloy sleeve itself can form a good seal at the contact surface between the dynamic sealing sleeve and the shaft sleeve by utilizing its sealing performance. At the same time, graphite also has a certain self-lubricating effect, which can effectively reduce the frictional wear on the dynamic sealing sleeve and help extend its service life. Under high temperature conditions, since the expansion coefficient of the shaft sleeve is greater than that of the dynamic sealing sleeve, a gap will be formed between the shaft sleeve and the dynamic sealing sleeve. On the one hand, this can prevent the shaft sleeve and the dynamic sealing sleeve from getting stuck. On the other hand, the existence of this gap will greatly reduce the frictional wear between the dynamic sealing sleeve and the shaft sleeve, which is also conducive to extending the service life.

[0034] (3) The hot air door shaft sealing device of this utility model has an annular air storage space on the inner wall of the shaft sleeve. Sealing air is introduced into the air storage space through the ventilation pipe, which can effectively ensure the sealing performance of the contact surface between the shaft sleeve and the dynamic sealing sleeve. At the same time, when the machine is stopped, the sealing air can clean the coal ash in the gap between the shaft sleeve and the dynamic sealing sleeve to prevent the coal ash from getting stuck between the shaft sleeve and the dynamic sealing sleeve after cooling to room temperature; when restarting, the presence of coal ash will accelerate the frictional wear between the two. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of a hot air door shaft sealing device according to the present invention;

[0036] Figure 2 This is a top view of a hot air door shaft sealing device according to the present invention;

[0037] Figure 3 for Figure 2 Sectional view along the middle AA direction;

[0038] Figure 4 for Figure 3 A magnified view of a portion of point B in the middle;

[0039] Figure 5 for Figure 3 A magnified view of a portion of point C in the middle;

[0040] Figure 6 This is a schematic diagram of the static sealing sleeve in this utility model;

[0041] Figure 7 This is a schematic diagram of the structure of the dynamic sealing sleeve in this utility model;

[0042] Figure 8 This is a schematic diagram of the structure of the bushing of this utility model;

[0043] Figure 9 This is a schematic diagram of the assembly between a hot air door shaft sealing device and a door shaft according to the present invention.

[0044] In the diagram: 100, door hinge; 200, stuffing chamber base; 300, gland;

[0045] 400. Static sealing sleeve; 410. First annular platform; 420. First through hole; 500. Dynamic sealing sleeve;

[0046] 510, Second annular platform; 520, Third annular platform; 530, Second through hole; 540, Limiting annular groove;

[0047] 600, sealing assembly; 610, elastic element; 620, first sealing ring; 630, bushing; 631, air storage space; 632, third through hole; 640, ventilation pipe; 650, second sealing ring; 660, steering channel. Detailed Implementation

[0048] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.

[0049] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] The present invention will be further described below with reference to specific embodiments.

[0051] like Figure 1 , Figure 2As shown, a hot air damper shaft sealing device of this embodiment includes a dynamic sealing sleeve 500 and a static sealing sleeve 400 arranged in an inner and outer manner, with a certain installation space between the dynamic sealing sleeve 500 and the static sealing sleeve 400. A sealing component 600 is provided in the installation space. The sealing component 600 is used to transform the axial seal between the dynamic and static sealing sleeves into a planar seal at the end of the sealing component 600.

[0052] like Figure 3 As shown, the sealing assembly 600 includes, from top to bottom, an elastic element 610, a first sealing ring 620, and a bushing 630, all sequentially fitted onto the dynamic sealing sleeve 500. The first sealing ring 620 is a metal sealing ring, and a diversion channel 660 is formed between the lower surface of the first sealing ring 620 and the upper surface of the bushing 630. The air inlet of the diversion channel 660 extends to the axial sealing surface between the bushing 630 and the dynamic sealing sleeve 500, while its outlet is offset from the sealing surface between them. This transforms the axial seal between the dynamic and static sealing sleeves into a planar seal at the outlet of the diversion channel 660. In other words, if hot air carrying coal ash passes through the axial sealing surface between the bushing 630 and the dynamic sealing sleeve 500, it will enter the diversion channel 660 through the air inlet and ultimately be sealed by the first sealing ring 620 at the outlet of the diversion channel 660, preventing leakage of hot air and coal ash. At the same time, the extrusion force of the elastic element 610 is used to elastically compensate the first sealing ring 620. The overall extrusion direction is along the axial direction of the bushing 630 to ensure the sealing performance of the first sealing ring 620 at the air outlet of the steering channel 660.

[0053] Specifically, an annular platform is provided on the outer peripheral wall of the dynamic sealing sleeve 500 and the inner peripheral wall of the static sealing sleeve 400. The first sealing ring 620 is located above the annular platform, and the bushing 630 is located below the annular platform. At this time, the first sealing ring 620, the bushing 630, and the two annular platforms form a turning channel 660, and the air outlet of the turning channel 660 is located between the two annular platforms. The first sealing ring 620 covers the upper surface of the two annular platforms to provide a planar seal at the air outlet; and the elastic extrusion force of the upper elastic member 610 provides elastic compensation for the first sealing ring 620 to ensure the sealing performance at the air outlet.

[0054] refer to Figure 9As shown in the figure, in this embodiment of a hot air door shaft sealing device, a dynamic sealing sleeve 500 is fixedly sleeved on the door shaft 100 and moves synchronously with the door shaft 100; naturally, the contact surfaces between the two must be in sealed contact. A static sealing sleeve 400 is disposed on the stuffing chamber base 200. For ease of assembly, both the dynamic sealing sleeve 500 and the static sealing sleeve 400 can be designed as split pieces. Furthermore, welding can be used between the dynamic sealing sleeve 500 and the door shaft 100, and between the static sealing sleeve 400 and the stuffing chamber base 200, to increase their respective connection strength.

[0055] Additionally, a pressure cap 300 is provided at the top of the static sealing sleeve 400, and an elastic element 610 is confined between the pressure cap 300 and the first sealing ring 620, so that the elastic element 610 can always provide compressive force to the first sealing ring 620 to ensure the sealing performance of the first sealing ring 620 at the air outlet of the steering channel 660. The elastic element 610 can be a spring; the pressure cap 300 and the static sealing sleeve 400 can be connected by bolts or integrally formed; no specific limitation is made here.

[0056] During operation, the fixed fit between the dynamic sealing sleeve 500 and the door hinge 100 transforms the axial seal between them into an axial seal between the dynamic sealing sleeve 500 and the static sealing sleeve 400, thereby reducing frictional wear on the door hinge 100 and extending its service life. Simultaneously, the axial seal between the dynamic sealing sleeve 500 and the static sealing sleeve 400 can be further transformed into a planar seal at the outlet of the steering channel 660. In high-temperature environments, a metal sealing ring can be used as the sealing element for the planar seal at the outlet of the steering channel 660. Furthermore, the compressive force of the elastic element 610 can be used to elastically compensate for the metal sealing ring, thus balancing the requirements of high-temperature resistance and elastic compensation performance to improve axial sealing performance under high-temperature conditions.

[0057] refer to Figure 4 , Figure 6 as well as Figure 7As shown, in some embodiments, a first annular platform 410 is provided on the inner peripheral wall of the static sealing sleeve 400, and a second annular platform 510 is provided on the outer peripheral wall of the dynamic sealing sleeve 500. The upper surfaces of the first annular platform 410 and the second annular platform 510 are aligned, allowing the first sealing ring 620 to smoothly cover the upper surfaces of the two annular platforms, forming a planar seal. The lower surface of the first annular platform 410 is lower than the lower surface of the second annular platform 510, and the top of the bushing 630 abuts against the lower surface of the first annular platform 410. At this time, a certain gap is formed between the top of the bushing 630 and the lower surface of the second annular platform 510, which serves as the air intake section of the deflection channel 660 to facilitate airflow. Thus, the first annular platform 410, the second annular platform 510, the first sealing ring 620, and the bushing 630 form an L-shaped deflection channel 660 to change the direction of airflow. It should be noted that the flow of coal ash is mainly carried by the flow of hot air, so the airflow mentioned above actually includes hot air and the coal ash carried by the hot air.

[0058] Furthermore, the bushing 630 is a metal sleeve, and the coefficient of expansion of this metal sleeve is greater than the coefficient of expansion of the dynamic sealing sleeve 500. Preferably, the bushing 630 is a copper-graphite alloy sleeve. That is, the main body of the bushing 630 is a cylindrical copper ring, on which multiple through holes are formed between the inner and outer walls, and these through holes are filled with graphite. In this way, not only is the sealing performance of the bushing 630 itself guaranteed, but its wear resistance is also improved.

[0059] In this embodiment, a hot air door shaft sealing device, in its non-operating state (i.e., at room temperature), utilizes the sealing performance of the copper-graphite alloy sleeve to form a good seal on the axial sealing surface between the sleeve 630 and the dynamic sealing sleeve 500. Simultaneously, graphite also has a certain self-lubricating effect, effectively reducing frictional wear on the dynamic sealing sleeve 500 and extending its service life. In the operating state (i.e., at high temperature), because the expansion coefficient of the sleeve 630 is greater than that of the dynamic sealing sleeve 500, a gap forms between the sleeve 630 and the dynamic sealing sleeve 500. This gap significantly reduces frictional wear between the dynamic sealing sleeve 500 and the sleeve 630, further extending their service life. Furthermore, because the gap connects to the air inlet of the steering channel 660, hot air carrying coal ash passes through this gap and enters the steering channel 660. The air outlet of the steering channel 660 is sealed by the first sealing ring 620, and the elastic element 610 provides sufficient elastic compensation, thus achieving axial sealing of the door shaft 100.

[0060] refer to Figure 3 , Figure 5 , Figure 8As shown, in some embodiments, an annular air storage space 631 is formed on the inner wall of the bushing 630, and sealing air is introduced into the air storage space 631 through the ventilation pipe 640. At the same time, a first through hole 420 and a third through hole 632 for the ventilation pipe 640 to pass through are respectively formed in the static sealing sleeve 400 and the bushing 630.

[0061] Preferably, to facilitate the assembly of the ventilation duct 640, the first through hole 420 and the third through hole 632 can be formed between two mating split surfaces. Taking the first through hole 420 as an example, a semi-circular hole is formed on the connecting surface of each of the two split bodies of the static sealing sleeve 400, so that when the two split bodies are combined, a complete first through hole 420 can be formed. At the same time, to facilitate the assembly between the two split bodies, a connecting lug with a hole can be provided on each split body, and then the two connecting lugs can be locked using a locking bolt.

[0062] This embodiment of a hot air damper shaft sealing device, through the introduction of sealing air, can further improve the axial sealing performance between the bushing 630 and the dynamic sealing sleeve 500. Furthermore, as analyzed above, under high-temperature operating conditions, a gap will form at the axial sealing surface between the bushing 630 and the dynamic sealing sleeve 500. During shutdown and cooling, this gap will gradually decrease; at this time, the hot air will carry some coal ash and remain in the gap. When restarting, the presence of coal ash will accelerate frictional wear between the two. Therefore, during shutdown and cooling, the sealing air can be used to clean the coal ash remaining in the gap.

[0063] Of course, in order to further ensure the sealing performance of the contact surface between the dynamic sealing sleeve 500 and the door hinge 100, a second through hole 530 can be provided on the dynamic sealing sleeve 500. The sealing air in the air storage space 631 can be introduced into the contact surface between the dynamic sealing sleeve 500 and the door hinge 100 through the second through hole 530 to improve the sealing effect between the two.

[0064] It's worth noting that in traditional hot air damper shaft axial seals, packing seals are typically used to meet the sealing requirements of high-temperature environments (around 300°C). However, because packing seals lack elasticity, they usually require sealing air, and the pressure of this sealing air is generally greater than that of the purging hot air, thus utilizing the pressure difference for axial sealing. But this inevitably affects the pressure of the sealing air itself.

[0065] In this embodiment, during operation, when the first sealing ring 620 can form an effective seal, the sealing air supply can be stopped, thereby reducing interference with the purging hot air pressure. During shutdown and cooling, sealing air can be supplied to purge the coal ash in the gap between the bushing 630 and the dynamic sealing sleeve 500. Of course, sealing air can also be supplied during operation to further ensure the sealing effect.

[0066] In other embodiments, the bottom of the dynamic sealing sleeve 500 is further provided with a third annular platform 520, and a second sealing ring 650 is provided between the third annular platform 520 and the top of the bushing 630 to further ensure the sealing performance between the bushing 630 and the dynamic sealing sleeve 500. Of course, in order to be suitable for high-temperature environments, the second sealing ring 650 can also be made of a high-temperature resistant metal sealing ring.

[0067] Furthermore, the outer peripheral wall of the bushing 630 is provided with a limiting ring groove 540 for the second sealing ring 650 to be inserted into.

[0068] This embodiment of a hot air door shaft sealing device firstly transforms the axial seal between the dynamic sealing sleeve 500 and the door shaft 100 into an axial seal between the dynamic sealing sleeve 500 and the static sealing sleeve 400 by utilizing the fixed sleeve between the dynamic sealing sleeve 500 and the door shaft 100. Then, through a clever design of the specific structure of the sealing assembly 600, and by utilizing the diversion channel 660, the axial seal between the dynamic sealing sleeve 500 and the static sealing sleeve 400 is transformed into a planar seal at the outlet of the diversion channel 660. In this way, under high-temperature conditions, a metal sealing ring with high-temperature resistance can be used as the sealing element for the planar seal at the outlet of the diversion channel 660. Simultaneously, the compressive force of the elastic element 610 provides elastic compensation for the metal sealing ring, thereby balancing high-temperature resistance and elastic compensation performance to improve the axial sealing performance under high-temperature conditions.

[0069] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A hot air damper shaft sealing device, comprising a dynamic sealing sleeve (500) and a static sealing sleeve (400) arranged in an inner and outer manner, wherein a sealing assembly (600) is installed between the dynamic and static sealing sleeves; characterized in that: The sealing assembly (600) includes, from top to bottom, an elastic element (610), a first sealing ring (620), and a bushing (630) sequentially fitted onto the dynamic sealing sleeve (500); wherein, The outer peripheral wall of the dynamic sealing sleeve (500) and the inner peripheral wall of the static sealing sleeve (400) are each provided with an annular platform. The first sealing ring (620) is located above the annular platform, and the bushing (630) is located below the annular platform. A turning channel (660) is formed between the first sealing ring (620) and the bushing (630). The steering channel (660) is used to convert the axial seal at the outer peripheral wall of the dynamic sealing sleeve (500) into a planar seal at the air outlet of the steering channel (660); and the air outlet of the steering channel (660) is arranged away from the axial sealing surface between the bushing (630) and the dynamic sealing sleeve (500). The first sealing ring (620) is a metal sealing ring, which is elastically compensated by the compressive force of the elastic element (610).

2. The hot air damper shaft sealing device according to claim 1, characterized in that: The static sealing sleeve (400) is provided with a first annular platform (410) inside, and the dynamic sealing sleeve (500) is provided with a second annular platform (510) outside; wherein, the upper surfaces of the first annular platform (410) and the second annular platform (510) are aligned, and the lower surface of the first annular platform (410) is lower than the lower surface of the second annular platform (510). The first ring platform (410), the second ring platform (510), the first sealing ring (620), and the bushing (630) form an L-shaped steering channel (660), and the air outlet of the steering channel (660) is located between the two ring platforms.

3. A hot air damper shaft sealing device according to claim 1 or 2, characterized in that: The bushing (630) is a metal sleeve, and the expansion coefficient of the metal sleeve is greater than that of the dynamic sealing sleeve (500). Under the action of high temperature hot air, a gap is formed between the bushing (630) and the dynamic sealing sleeve (500), and the gap is connected to the air inlet of the steering channel (660).

4. The hot air damper shaft sealing device according to claim 3, characterized in that: The bushing (630) is a copper-graphite alloy bushing.

5. A hot air damper shaft sealing device according to claim 3, characterized in that: The inner wall of the bushing (630) has an annular air storage space (631), which introduces sealing air through the ventilation pipe (640); the bushing (630) and the static sealing sleeve (400) have through holes for the ventilation pipe (640) to pass through.

6. A hot air damper shaft sealing device according to claim 5, characterized in that: The bottom of the dynamic sealing sleeve (500) is provided with a third ring platform (520), and a second sealing ring (650) is provided between the third ring platform (520) and the bushing (630).

7. A hot air damper shaft sealing device according to claim 6, characterized in that: The outer peripheral wall of the bushing (630) is provided with a limiting ring groove (540) for the second sealing ring (650) to be inserted, and the second sealing ring (650) is a metal ring.

8. A hot air damper shaft sealing device according to claim 5, characterized in that: The dynamic sealing sleeve (500) is provided with a second through hole (530) for connecting the gas storage space (631) and the inner cavity of the dynamic sealing sleeve (500).

9. A hot air damper shaft sealing device according to claim 1, characterized in that: The top of the static sealing sleeve (400) is provided with a pressure cap (300), which is connected to the static sealing sleeve (400) by bolts or integrally formed; the elastic element (610) is limited between the pressure cap (300) and the first sealing ring (620).

10. A hot air damper shaft sealing device, characterized in that: include, A dynamic sealing sleeve (500) is fixedly sleeved on the door hinge (100). The dynamic sealing sleeve (500) moves synchronously with the door hinge (100), and the two are in sealed contact. A static sealing sleeve (400) is provided on the base (200) of the stuffing chamber, and the static sealing sleeve (400) is sleeved on the outside of the dynamic sealing sleeve (500), with an installation space between the two. and a sealing assembly (600) disposed within the installation space; wherein, The sealing assembly (600) includes an elastic element (610), a first sealing ring (620), and a bushing (630) sequentially fitted onto the dynamic sealing sleeve (500) from top to bottom; a turning channel (660) is formed between the first sealing ring (620) and the bushing (630); The air outlet of the steering channel (660) has a certain distance from the inner wall of the bushing (630), which is used to convert the axial seal between the dynamic sealing sleeve (500) and the bushing (630) into a planar seal between the first sealing ring (620) and the air outlet of the steering channel (660); and the first sealing ring (620) is elastically compensated by the extrusion force of the elastic element (610).

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