Door shaft sealing device for damper door

Abstract

The utility model provides a door shaft sealing device for a baffle door, which is mounted at a door shaft penetrating part of the baffle door in a boiler or a pipeline system and comprises a rotating shaft sleeve, a bearing, a hollow shell, a first flange cover plate, a second flange cover plate, a ring seat and a third flange cover plate, the door shaft penetrates through the whole sealing device; the front end of the door shaft is fixedly connected with the rotating shaft sleeve; the rotating shaft sleeve is fixedly arranged outside the door shaft body in a sleeving mode, and a bearing is installed on the outer ring of the rotating shaft sleeve and installed in the ring base. The ring seat is arranged between and fixedly connected with the second flange cover plate and the third flange cover plate; the hollow shell is of a cylindrical structure, the outer wall of the hollow shell is provided with a cold air connector used for leading in positive-pressure cold air and can enable the ring base to form an annular cold air sealing cavity outside the door shaft when the cold air is led in, and the front end and the rear end of the hollow shell are connected with the second flange cover plate and the first flange cover plate respectively. The possibility of leakage of high-temperature flue gas can be effectively reduced, and meanwhile, the heat influence of the high-temperature flue gas on the sealing device is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industrial sealing structure, and particularly relates to a door shaft sealing device for a baffle door. BACKGROUND

[0002] In an industrial boiler, a flue gas purification device and a pipeline regulating system, a baffle door is a common on-off control structure, and a rotating door shaft needs to pass through a device shell to be connected to an external driving mechanism to realize opening and closing actions. Since high-temperature flue gas, high-pressure dust and other media are often accompanied in the running environment, the sealing structure of the door shaft passing through position is a key part affecting the sealing performance and running safety of the system, and must have stable sealing capacity to prevent flue gas leakage and heat loss.

[0003] In the prior art, the sealing mode of the door shaft passing through position is mostly to use a packing box, a gland assembly or a simple sealing cavity structure, to set a flexible sealing member around the door shaft and to perform close sealing through screw pressing. Although this kind of structure is simple to install and has a mature basic structure, under long-term running conditions such as high-temperature fluctuation and equipment vibration, the sealing cavity does not have enough strength, the sealing member is prone to aging and dislocation, and thus the sealing effect is weakened. In addition, some devices lack effective heat insulation structures, so that the sealing position is long-term under high-temperature flushing, which reduces the sealing life and increases the leakage risk.

[0004] Therefore, how to design an improved sealing device capable of forming a surrounding sealing space and having an auxiliary flue gas isolation function has become a key technical problem urgently to be solved in the field. CONTENT OF THE UTILITY MODEL

[0005] The present application provides a door shaft sealing device for a baffle door to solve the problem of flue gas leakage at the door shaft passing through position in the prior art.

[0006] The present application provides a door shaft sealing device for a baffle door, which is installed at the door shaft passing through position of a baffle door in a boiler or a pipeline system, and comprises a rotating shaft sleeve, a bearing, a hollow shell, a first flange cover plate, a second flange cover plate, a ring seat and a third flange cover plate.

[0007] The door shaft penetrates through the entire sealing device, and the front end of the door shaft is fixedly connected with the rotating shaft sleeve. The rotating shaft sleeve is fixedly sleeved outside the shaft body of the door shaft, and a bearing is installed on the outer ring of the rotating shaft sleeve. The bearing is installed inside the ring seat. The ring seat is arranged between the second flange cover plate and the third flange cover plate and is fixedly connected with the two. The hollow shell is a cylindrical structure. A cold air interface for introducing positive pressure cold air is arranged on the outer wall of the hollow shell, and the ring seat can form a ring-shaped cold air sealing cavity outside the door shaft when the cold air is introduced. The front end and the rear end of the hollow shell are connected with the second flange cover plate and the first flange cover plate respectively.

[0008] In an alternative embodiment, the ring seat is welded and fixed on the shaft hole of the equipment shell at the door shaft passing position, and the door shaft sequentially penetrates the third flange cover plate, the ring seat, the second flange cover plate, the hollow shell and the first flange cover plate from front to back.

[0009] In an alternative embodiment, the rear end of the hollow shell is screwed and fixed with the first flange cover plate, and the front end of the hollow shell is screwed and fixed with the second flange cover plate.

[0010] In an alternative embodiment, the second flange cover plate and the third flange cover plate are respectively connected to the two sides of the ring seat through bolts.

[0011] In an alternative embodiment, the hollow shell is respectively provided with a sealing washer between the connecting surfaces connected with the first flange cover plate and the second flange cover plate.

[0012] In an alternative embodiment, the rotating shaft sleeve is a sleeve with an axial stepped structure, which includes a first cylindrical sleeve segment and a second cylindrical sleeve segment arranged in sequence along the axial direction, the outer diameter of the first cylindrical sleeve segment is smaller than the outer diameter of the second cylindrical sleeve segment, the bearing is installed on the outside of the first cylindrical sleeve segment, and an axial stepped surface formed between the first cylindrical sleeve segment and the second cylindrical sleeve segment is used to axially limit the bearing.

[0013] In an alternative embodiment, the cold air interface is arranged at the front side wall of the hollow shell, the cold air interface is in communication with the external air supply pipeline and can be used to supply positive pressure cold air into the hollow shell.

[0014] In an alternative embodiment, the inner wall of the ring seat is provided with a bearing mounting groove for accommodating the bearing, the bearing is mounted in the bearing mounting groove, and the ring seat can be limited and fixedly mounted on the bearing by the bearing mounting groove and the axial stepped surface of the rotating shaft sleeve.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] 1. The present application provides a door shaft sealing device for a baffle door, in which the hollow shell is designed as a complete cylindrical structure, the two ends of which are connected through the second flange cover plate and the first flange cover plate respectively, and a continuous shell passage is formed around the door shaft. Compared with the previous sealing structure in which multiple components are simply stacked, the hollow shell realizes the covering and space definition of the passing position of the door shaft, so that the position and size of the sealing area are more definite. At the same time, the second flange cover plate and the first flange cover plate connected at the front and rear of the hollow shell are convenient for rigidly fixed with the equipment shell of the pipeline or boiler system through the flange connection, thereby reducing the possibility of axial or radial deviation after assembly, and further providing a stable structural foundation for the overall sealing structure.

[0017] 2. Meanwhile, the cold air interface is arranged on the outer wall of the hollow shell, which can be connected with the external air supply pipeline to facilitate the stable delivery of the positive pressure cold air into the hollow shell. Moreover, the cold air interface and the hollow shell are integrally designed, and the installation connection is highly reliable. When the positive pressure cold air enters the hollow shell, a circumferential gas isolation barrier is formed around the door shaft. This barrier can not only effectively reduce the possibility of high-temperature flue gas leakage, but also reduce the heat impact of the high-temperature flue gas on the sealing device, thereby prolonging the service life of the sealing structure. Overall, the integrated cold air introduction structure significantly improves the reliability and use effect of the sealing device.

[0018] 3. The ring seat is located between the second flange cover plate and the third flange cover plate and is tightly connected with the two. The arrangement of the ring seat not only plays a role in receiving and transitioning, but more importantly, the ring seat is arranged around the door shaft and the rotating shaft sleeve and is installed with bearings, which can provide a stable support surface for the cold air entering the ring-shaped cold air sealing cavity formed outside the door shaft during use. The front end of the hollow shell is connected with the ring seat through the second flange cover plate, and the cold air entering the hollow shell through the cold air interface can form an air curtain layer around the door shaft, which helps to improve the sealing performance of the sealing device under complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0020] Figure 1 The structural schematic diagram of the door shaft sealing device for the baffle door provided by an embodiment of the present application is shown in the figure.

[0021] Figure 2 The schematic diagram of the door shaft sealing device for the baffle door provided by an embodiment of the present application when the third flange cover plate is removed is shown in the figure.

[0022] Figure 3 The exploded schematic diagram of the door shaft sealing device for the baffle door provided by an embodiment of the present application is shown in the figure.

[0023] Figure 4 The structural schematic diagram of the rotating shaft sleeve provided by an embodiment of the present application is shown in the figure.

[0024] Figure 5 The structural schematic diagram of the ring seat provided by an embodiment of the present application is shown in the figure.

[0025] Reference Signs List:

[0026] 10 - door shaft; 100 - rotating shaft sleeve; 200 - bearing; 300 - hollow shell; 310 - cold air interface; 320 - sealing washer; 400 - first flange cover plate; 500 - second flange cover plate; 600 - ring seat; 610 - bearing mounting groove; 700 - third flange cover plate. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are described clearly and completely below. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0028] Please refer to Figures 1-5 The embodiments of the present application provide a door shaft sealing device for a baffle door, which is installed at a door shaft 10 penetration position of a baffle door in a boiler or a pipeline system, and includes a rotating shaft sleeve 100, a bearing 200, a hollow shell 300, a first flange cover plate 400, a second flange cover plate 500, a ring seat 600 and a third flange cover plate 700.

[0029] Specifically, the door shaft 10 penetrates through the entire sealing device, and a front end of the door shaft 10 is fixedly connected with the rotating shaft sleeve 100; the rotating shaft sleeve 100 is fixedly sleeved outside a shaft body of the door shaft 10, and a bearing 200 is installed on an outer ring of the rotating shaft sleeve 100, and the bearing 200 is installed inside the ring seat 600; the ring seat 600 is arranged between the second flange cover plate 500 and the third flange cover plate 700 and fixedly connected with the second flange cover plate 500 and the third flange cover plate 700; the hollow shell 300 is a cylindrical structure, an outer wall of the hollow shell 300 is provided with a cold air interface 310 for introducing positive pressure cold air, and the ring seat 600 can form an annular cold air sealing cavity outside the door shaft 10 when the cold air is introduced; and front and rear ends of the hollow shell 300 are connected with the second flange cover plate 500 and the first flange cover plate 400 respectively.

[0030] In the embodiment, the hollow shell 300 is designed as a complete cylindrical structure, the two ends of which are connected through the second flange cover plate 500 and the first flange cover plate 400 respectively, and a continuous shell passage is formed around the door shaft 10. Compared with the previous sealing structure in which multiple components are simply stacked, the hollow shell 300 realizes the covering and space definition of the passing part of the door shaft 10, so that the position and size of the sealing area are more clear; at the same time, the second flange cover plate 500 and the first flange cover plate 400 connected in front and back of the hollow shell 300 are convenient for rigid fixation with the equipment shell of the pipeline or boiler system through the flange connection, so as to reduce the possibility of axial or radial deviation after assembly, and further provide a stable structural basis for the overall sealing structure.

[0031] At the same time, the cold air interface 310 is provided on the outer wall of the hollow shell 300 in the embodiment, which is not temporarily welded or locally bored, but is reserved in the structural design. The cold air interface 310 can be used for connection with the external air supply pipeline, so as to conveniently and stably transport the positive pressure cold air into the hollow shell 300. Moreover, the cold air interface 310 and the hollow shell 300 are integrally designed, and the installation connection reliability is high. When the positive pressure cold air enters the inside of the hollow shell 300, a circumferential gas isolation barrier can be formed in the outer peripheral area of the door shaft 10. This barrier not only can effectively reduce the possibility of high-temperature flue gas leakage, but also can reduce the heat influence of the high-temperature flue gas on the sealing device, and prolong the service life of the sealing structure. Overall, the integrated cold air introduction structure obviously improves the reliability and use effect of the sealing device.

[0032] In addition, in the embodiment, the ring seat 600 is located between the second flange cover plate 500 and the third flange cover plate 700 and is tightly connected with the two. The setting of the ring seat 600 not only plays a role of receiving and transition, but more importantly, the ring seat 600 is arranged around the door shaft 10 and the rotating shaft sleeve 100 and the bearing 200 is installed, which can provide a stable support surface for the cold air entering the annular cold air sealing cavity formed by the ring seat 600 outside the door shaft 10 to form an annular air curtain. The front end of the hollow shell 300 is connected with the ring seat 600 through the second flange cover plate 500, and the cold air entering the hollow shell 300 through the cold air interface 310 can form an air curtain layer around the door shaft 10, which is helpful to improve the sealing performance of the sealing device under complex working conditions.

[0033] In some embodiments, the ring seat 600 is welded and fixed on the shaft hole of the equipment shell at the passing part of the door shaft 10, and the door shaft 10 penetrates the third flange cover plate 700, the ring seat 600, the second flange cover plate 500, the hollow shell 300 and the first flange cover plate 400 in sequence from front to back.

[0034] In the above embodiment, the ring seat 600 is fixed to the equipment shell shaft hole by welding, which helps to improve the connection rigidity between the sealing device and the equipment shell. Specifically, in this embodiment, the ring seat 600 is directly arranged at the equipment shell shaft hole at the position where the door shaft 10 penetrates by welding. Compared with screw connection, this structure is more stable in resisting vibration and thermal deformation, and can reduce the risk of loosening caused by thermal expansion and contraction or structural stress during operation. After welding, the mounting reference point of the sealing device as a whole is firmly fixed on the equipment shell, thereby improving the firmness of assembly and having good structural integrity. During equipment operation, the door shaft 10 can also maintain good coaxiality in the channel formed by the device, while reducing the displacement of the bearing 200 and other components due to loose fitting position, thereby making the working state of the sealing device more stable.

[0035] Meanwhile, in this embodiment, the door shaft 10 penetrates the third flange cover plate 700, the ring seat 600, the second flange cover plate 500, the hollow shell 300 and the first flange cover plate 400 in sequence from front to back. This linear penetration sequence makes the cooperation of each component more clear in structure, and reduces the possibility of rework caused by incorrect assembly direction or component misplacement during installation.

[0036] In addition, the ring seat 600 is a key supporting component of the cold air sealing cavity forming area, and its stability directly affects the uniformity of the cold air flow field and the sealing performance. When the cold air is introduced through the cold air interface 310, the airflow is distributed around the outside of the door shaft 10, relying on the space definition and structural constraint provided by the ring seat 600. If the ring seat is a movable structure, it is easy to deviate under the impact of cold air or system vibration, thereby destroying the original airflow channel. In this embodiment, the ring seat 600 is welded and fixed on the shaft hole of the equipment shell at the position where the door shaft 10 penetrates. Such welding method helps to form a stable connection between the ring seat 600 and the equipment shell, so that the airflow inside the device can be distributed more stably, thereby reducing the disturbance of the air curtain and improving the sealing isolation effect and prolonging the working period of the device.

[0037] In some embodiments, the rear end of the hollow shell 300 is screw-fixed with the first flange cover plate 400, and the front end of the hollow shell 300 is screw-fixed with the second flange cover plate 500.

[0038] In this embodiment, the hollow shell 300 is the main shell part of the sealing device, and its two ends are connected with the first flange cover plate 400 and the second flange cover plate 500 respectively by screwing. This way helps to improve the fitting precision between the contact surfaces, reduces the deviation phenomenon caused by temperature difference or uneven force, and makes the entire sealing structure maintain good coaxiality after installation.

[0039] The screw connection structure of the embodiment can form a close connection point between the hollow shell 300 and the front and rear flange cover plates, and has strong anti-seismic capability. When the device is running, the hollow shell 300 structure is not easily disturbed by thermal expansion and contraction or pipeline vibration, thereby reducing the risk of shaking at the connection.

[0040] In some embodiments, the second flange cover plate 500 and the third flange cover plate 700 are respectively connected to the two sides of the ring seat 600 by bolts.

[0041] In the embodiment, the second flange cover plate 500 and the third flange cover plate 700 are respectively fixed on the two sides of the ring seat 600 by bolts, and a symmetrical pressing relationship is formed with the ring seat 600 as a reference. This way is more convenient for position fine adjustment during tightening, which is conducive to adjusting the state of the close surface between components and improving assembly accuracy. After connection, the stress state of the whole structure is more uniform, which helps to maintain the relative central arrangement of the door shaft 10 during operation, reduces the risk of eccentricity caused by vibration or thermal deformation, and improves the running stability of the sealing part. Moreover, the bolt connection between the second flange cover plate 500 and the third flange cover plate 700 and the ring seat 600 also provides convenience for local maintenance, avoiding the disassembly of the whole structure due to the replacement of individual parts, and reducing the maintenance interference range.

[0042] In some embodiments, the hollow shell 300 is provided with a sealing gasket 320 between the connection surfaces connected with the first flange cover plate 400 and the second flange cover plate 500.

[0043] In the above embodiment, after introducing the sealing gasket 320, the gasket will be elastically compressed during the screw tightening process, thereby forming a relatively continuous surface sealing layer between the connection surfaces, which plays a role in plugging micro gaps and enhancing the sealing boundary. Especially in high-temperature, dusty or pressure fluctuating environments, this way helps to stabilize the sealing state and improve the overall reliability of the sealing device. Optionally, the sealing gasket 320 is made of high-temperature-resistant silicone rubber sealing ring.

[0044] In some embodiments, the rotating shaft sleeve 100 is a sleeve with an axial stepped structure, and the rotating shaft sleeve 100 includes a first cylindrical sleeve segment and a second cylindrical sleeve segment arranged in sequence along the axial direction. The outer diameter of the first cylindrical sleeve segment is smaller than the outer diameter of the second cylindrical sleeve segment. The bearing 200 is installed on the outside of the first cylindrical sleeve segment, and an axial stepped surface formed between the first cylindrical sleeve segment and the second cylindrical sleeve segment is used to axially limit the bearing 200.

[0045] In this embodiment, the rotating bushing 100 comprises two cylindrical sleeve sections with different outer diameters along the axial direction. The first cylindrical sleeve section has a smaller outer diameter and is used to support and install the bearing 200. Because there is a significant axial step between the first and second cylindrical sleeve sections, the bearing 200 is nested within the first cylindrical sleeve section during installation, with the second cylindrical sleeve section providing physical restraint, making positional drift less likely. This stepped structure facilitates control of the bearing 200's installation depth and orientation during assembly, reducing the probability of misalignment or incorrect installation, and improving assembly consistency between components.

[0046] Furthermore, the stepped surface structurally forms a natural stop, acting as an axial limiter and reducing the axial movement of the bearing 200 during operation. When the bearing 200 is fitted onto the first cylindrical sleeve section, its inner side can tightly adhere to the stepped surface of the second cylindrical sleeve section, thereby limiting its axial displacement. As part of the main structure of the rotating bushing 100, the stepped surface achieves the limiting function without the need for additional retaining rings or snap rings. This structural design is simple and easy to implement. Simultaneously, the integrally machined stepped portion of the rotating bushing 100 possesses high strength and fitting precision, making it less prone to loosening or structural deformation even under operating conditions with large temperature fluctuations or frequent start-stop cycles, thus contributing to improved operational stability of the bearing 200.

[0047] In some embodiments, the cold air inlet 310 is disposed on the front side wall of the hollow housing 300. The cold air inlet 310 is connected to the external air supply duct and can be used to supply positive pressure cold air into the hollow housing 300 to form a sealed isolation barrier.

[0048] In this embodiment, the cold air inlet 310 is arranged on the front side wall of the hollow housing 300. Through this cold air inlet 310, cold air can be directly delivered from the external air duct to the interior of the sealing device. When the cold air enters, it can quickly diffuse around the door hinge 10, forming an airflow band around the axis in a timely manner. Since the cold air inlet is located at the front end, the airflow is more direct when it reaches the internal cold air sealing cavity.

[0049] Meanwhile, in this embodiment, the cold air inlet 310 is connected to an external air supply duct. During on-site operation, the cold air duct only needs to be connected and fixed to the cold air inlet 310 to establish a continuous air supply channel, allowing cold air to be injected during equipment operation. During use, positive pressure cold air is introduced through the cold air inlet 310, forming a surrounding gas barrier around the door hinge 10. The cold air is isolated by pressure difference. Compared to traditional packing seals, this method significantly reduces mechanical wear during operation, decreases the running resistance of the door hinge 10 during rotation, and improves overall durability.

[0050] In some embodiments, the inner wall of the ring seat 600 is provided with a bearing mounting groove 610 for accommodating the bearing 200, which helps to clearly define the positioning area of ​​the bearing 200 and makes the installation process clearer and more standardized. The bearing 200 is installed in the bearing mounting groove 610, and the ring seat 600 can limit and fix the bearing 200 through the bearing mounting groove 610 and cooperate with the axial stepped surface of the rotating bushing 100.

[0051] In this embodiment, a bearing mounting groove 610 is pre-set on the inner wall of the ring seat 600, and its dimensions are designed to match the external parameters of the bearing 200. During installation, the bearing 200 can be fixedly installed in this mounting groove without the need for complex measurement or adjustment operations. The groove structure of the bearing mounting groove 610 provides the axial depth and radial limit required for the installation of the bearing 200, which can effectively reduce the probability of manual assembly errors, simplify the operation steps, and improve the consistency and reliability of assembly.

[0052] Furthermore, the bearing 200 is double-limited by the stepped surface of the rotating sleeve 100 and the bottom of the bearing mounting groove 610 within the bearing mounting groove 610. This structural combination helps improve axial stability during operation. Specifically, when the bearing 200 is embedded in the bearing mounting groove 610 of the ring seat 600, one side of it is in contact with the stepped surface of the rotating sleeve 100, while the other side is restrained by the bottom of the bearing mounting groove 610, thus making it easier to maintain the stability of the bearing 200's position even under long-term operating conditions.

[0053] The usage process of the door hinge sealing device for a baffle door provided in this embodiment is as follows:

[0054] This embodiment of the door hinge sealing device for a baffle door is suitable for installation in boiler or piping systems, specifically positioned where the door hinge 10 protrudes from the equipment housing. Before formal installation, it is necessary to first confirm the accurate positioning of the pre-drilled shaft hole on the equipment housing for subsequent alignment. After confirming the positioning, the ring seat 600 is welded and fixed to the shaft hole. After welding, the position of the ring seat 600 should be checked, especially whether the axial orientation of the bearing mounting groove 610 is aligned with the door hinge 10, to avoid deviations in subsequent assembly that could affect the normal installation of the bearing.

[0055] After the ring seat 600 is fixed, the second flange cover plate 500 and the third flange cover plate 700 are bolted to be installed on its front and rear sides respectively, so that the three form a clamping structure and construct an axial sealing support frame. When assembling this structure, oil stains or foreign objects on the connecting surfaces of the ring seat 600 and the connected flange cover plates should be cleaned in advance to facilitate a tighter fit.

[0056] Next, the hollow shell 300 is sequentially connected between the first flange cover plate 400 and the second flange cover plate 500 via threaded connections. During tightening, sealing gaskets 320 are placed on the connection surfaces at both ends to fill any possible assembly gaps. The sealing gaskets 320 should be flat against the connection surfaces to prevent sealing failure due to uneven force or tilted placement.

[0057] After the above structure is installed, the bearing 200 is assembled on the outside of the first cylindrical sleeve section of the rotating bushing 100, and the rotating bushing 100 with the bearing 200 installed is installed on the front end of the door hinge 10. At the same time, it is necessary to ensure that the bearing 200 is securely installed in the bearing mounting groove 610 of the ring seat 600. During the assembly process, one side of the bearing 200 needs to be in contact with the axial stepped surface between the second cylindrical sleeve section of the rotating bushing 100 to form a clear axial limit, which structurally prevents axial slippage of the bearing and helps to maintain the stability and smooth operation of the bearing during equipment operation.

[0058] After all structural installations are completed, the external air supply duct is connected to the cold air inlet 310 on the front side wall of the hollow housing 300. During equipment operation, positive pressure cold air is delivered into the interior of the hollow housing 300 through the cold air inlet 310 and flows along the periphery of the door hinge 10, forming a sealed air curtain. This structure helps to suppress the leakage of internal high-temperature flue gas from the door hinge outlet, thereby maintaining the stability of the sealing performance throughout the entire operating cycle and reducing the impact of high-temperature gas on the external environment.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A door hinge sealing device for a baffle door, characterized in that, The door hinge protruding part of the damper door installed in the boiler or piping system includes a rotating bushing, bearing, hollow housing, first flange cover plate, second flange cover plate, ring seat and third flange cover plate; The door hinge runs through the entire sealing device, and the front end of the door hinge is fixedly connected to the rotating bushing; the rotating bushing is fixedly sleeved on the outside of the door hinge shaft, and a bearing is installed on the outer ring of the rotating bushing, and the bearing is installed inside the ring seat; the ring seat is disposed between the second flange cover plate and the third flange cover plate and is fixedly connected to both; the hollow shell is a cylindrical structure, and the outer wall of the hollow shell is provided with a cold air inlet for introducing positive pressure cold air and can form an annular cold air sealing cavity outside the door hinge when cold air is introduced; the front and rear ends of the hollow shell are respectively connected to the second flange cover plate and the first flange cover plate.

2. The door hinge sealing device for a baffle door according to claim 1, characterized in that, The ring seat is welded and fixed to the shaft hole of the equipment housing where the door shaft passes through. The door shaft passes through the third flange cover plate, the ring seat, the second flange cover plate, the hollow housing and the first flange cover plate in sequence from front to back.

3. The door hinge sealing device for a baffle door according to claim 1, characterized in that, The rear end of the hollow shell is screwed to the first flange cover plate, and the front end of the hollow shell is screwed to the second flange cover plate.

4. The door hinge sealing device for a baffle door according to claim 1, characterized in that, The second flange cover and the third flange cover are respectively bolted to both sides of the ring seat.

5. The door hinge sealing device for a baffle door according to claim 3, characterized in that, The hollow shell is provided with sealing gaskets between the connection surfaces of the first flange cover plate and the second flange cover plate.

6. The door hinge sealing device for a baffle door according to claim 1, characterized in that, The rotating bushing is a sleeve with an axial stepped structure. The rotating bushing includes a first cylindrical sleeve section and a second cylindrical sleeve section arranged sequentially along the axial direction. The outer diameter of the first cylindrical sleeve section is smaller than the outer diameter of the second cylindrical sleeve section. The bearing is installed on the outside of the first cylindrical sleeve section. The axial stepped surface formed between the first cylindrical sleeve section and the second cylindrical sleeve section is used to axially limit the bearing.

7. The door hinge sealing device for a baffle door according to claim 1, characterized in that, The cold air inlet is located on the front side wall of the hollow shell. The cold air inlet is connected to the external air supply pipe and can be used to supply positive pressure cold air into the hollow shell.

8. The door hinge sealing device for a baffle door according to claim 6, characterized in that, The inner wall of the ring seat is provided with a bearing mounting groove for accommodating the bearing. The bearing is installed in the bearing mounting groove. The ring seat can limit and fix the bearing by means of the bearing mounting groove and the axial stepped surface of the rotating bushing.

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