Combustor secondary air door shaft bearing anti-sticking and dust leakage flexible sealing device

Abstract

The utility model discloses burner secondary air door bearing anti -jamming leaky ash flexible sealing device relates to the related technical field of burner, including bearing, bearing seat, flexible packing, sealing gland and air door axle, bearing fixed mounting is on the inner wall of air door frame, and bearing seat fixed connection is formed with the installation cavity that cooperates with bearing on the outer wall of air door frame, air door axle penetrates the axial through -hole of bearing and bearing seat, the utility model discloses burner secondary air door bearing anti -jamming leaky ash flexible sealing device, through setting up the thread compression structure of bearing seat and sealing gland, realize the axial dynamic compression sealing of flexible packing, synchronous elimination high temperature leaky ash and the problem of axle system rotation jam, through setting up the sealing gland of hexagonal outer periphery and the inner hole clearance cooperation, realize standard tool quick screwing operation, avoid the wear and tear of gland and air door axle friction, reduce maintenance cost.

Description

Technical Field

[0001] This utility model relates to the technical field of burners, and in particular to a flexible sealing device for preventing jamming and ash leakage in the secondary damper bearing of a burner. Background Technology

[0002] In coal-fired boiler systems, secondary air dampers are key components for regulating combustion airflow, and their bearing seals must operate continuously in high-temperature, dusty airflow environments exceeding 350℃. Traditional seals employ an asbestos packing + flange bolt clamping structure, which suffers from poor temperature resistance (≤350℃), inability to adjust online, and the need to disassemble the actuator for maintenance. High-temperature fly ash easily causes the sealing material to harden and fail, leading to ash leakage pollution and shaft jamming, severely impacting boiler operating efficiency and environmental performance. Especially under frequent adjustment conditions, the sealing material wears rapidly, and the fixed gland design cannot compensate for wear gaps, resulting in short maintenance cycles and high costs. This device is designed for the harsh operating conditions of coal-fired boilers in thermal power, metallurgy, and other fields, solving the problem of high-temperature dynamic sealing. Utility Model Content

[0003] The main purpose of this utility model is to provide a flexible sealing device for preventing jamming and ash leakage in the secondary air damper bearing of a burner, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A flexible sealing device for preventing jamming and ash leakage in a burner secondary damper bearing includes a bearing, a bearing housing, a flexible packing, a sealing cap, and a damper shaft. The bearing is fixedly installed on the inner wall of the damper frame, and the bearing housing is fixedly connected to the outer wall of the damper frame, forming an installation cavity that mates with the bearing. The damper shaft passes through an axial through-hole in both the bearing and the bearing housing, and forms a rotational fit with the inner ring of the bearing. A stuffing box is provided at the end of the bearing housing away from the damper frame, and the flexible packing fills the stuffing box and forms a sealing fit with the damper shaft. The sealing cap is connected to the end of the bearing housing via a threaded connection, forming an axial compression structure for the flexible packing.

[0006] Preferably, the outer peripheral surface of the sealing cover has a hexagonal structure, and its inner hole forms a clearance fit with the damper shaft.

[0007] Preferably, the damper shaft is fixedly connected to a damper baffle at the end located inside the damper frame, and the outline of the damper baffle is adapted to the cross-sectional shape of the air duct inside the damper frame.

[0008] Preferably, an actuator rocker arm is fitted onto the outer end of the damper shaft, and the actuator rocker arm is detachably connected to the damper shaft via a radially penetrating fixing pin.

[0009] Preferably, the flexible packing is made of a self-lubricating flexible sealing material with a temperature resistance of 600°C or higher, and its filling thickness is greater than the depth of the stuffing box and has axial compression allowance.

[0010] Preferably, the threaded engagement length between the bearing housing and the sealing gland is greater than 1.2 times the axial depth of the stuffing box, forming an adjustable axial clamping stroke.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. By setting a threaded clamping structure between the bearing housing and the sealing gland, the axial dynamic compression seal of the flexible packing is achieved, simultaneously eliminating the problems of high-temperature ash leakage and shaft rotation jamming.

[0013] 2. By setting a sealing cap with a hexagonal outer circumference and an inner hole clearance fit, a standard tool can be quickly turned, avoiding frictional wear between the cap and the damper shaft, reducing maintenance costs. By setting a damper baffle that matches the cross-section of the air duct, the airflow distribution is made uniform, reducing the risk of fly ash leakage caused by sudden pressure changes in the sealing area and improving adjustment accuracy.

[0014] 3. By setting a fixed pin connection for the actuator rocker arm, the actuator can be modularly and quickly disassembled, avoiding the limitations of welded structures on maintenance efficiency and shortening downtime for maintenance. By setting a 600℃-resistant self-lubricating flexible packing and an overfill design, the sealing material can achieve elastic compensation and wear self-adaptation under high-temperature conditions, ensuring long-term sealing reliability. By setting the bearing housing and gland to 1.2 times the thread fit length, the sealing compression stroke can be redundantly adjusted, preventing sealing failure caused by thread stripping and extending the maintenance cycle. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the flexible sealing device for preventing jamming and ash leakage in the secondary air damper bearing of the burner according to this utility model.

[0016] Figure 2 This is a three-dimensional structural diagram of the bearing seat of the flexible sealing device for preventing jamming and ash leakage in the secondary air damper bearing of the burner according to this utility model.

[0017] Figure 3 This is a schematic diagram of the installation structure of the flexible sealing device for preventing jamming and ash leakage in the secondary air damper bearing of the burner according to this utility model.

[0018] Figure 4 This is a three-dimensional structural diagram of the damper shaft of the flexible sealing device for preventing jamming and ash leakage in the secondary damper bearing of the burner according to this utility model.

[0019] In the diagram: 1. Bearing; 2. Bearing housing; 3. Screw; 4. Sealing gland; 5. Damper shaft; 6. Actuator rocker arm; 7. Damper frame; 8. Damper baffle. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] like Figure 1-4 As shown, the flexible sealing device for preventing jamming and ash leakage of the secondary damper bearing of the burner includes a bearing 1, a bearing housing 2, a flexible packing 3, a sealing cap 4, and a damper shaft 5. The bearing 1 is fixedly installed on the inner wall of the damper frame, and the bearing housing 2 is fixedly connected to the outer wall of the damper frame, forming an installation cavity that mates with the bearing 1. The damper shaft 5 passes through the axial through holes of the bearing 1 and the bearing housing 2, and forms a rotational fit with the inner ring of the bearing 1. A stuffing box is provided at the end of the bearing housing 2 away from the damper frame, and the flexible packing 3 is filled in the stuffing box and forms a sealing fit with the damper shaft 5. The sealing cap 4 is connected to the end of the bearing housing 2 by a threaded connection, forming an axial pressing structure for the flexible packing 3.

[0022] In this embodiment, the outer circumferential surface of the sealing cap 4 has a hexagonal structure, and its inner hole forms a clearance fit with the damper shaft 5. The hexagonal sealing cap 4 is easy to operate with a wrench, and the clearance fit of the inner hole avoids friction with the damper shaft 5, reducing maintenance difficulty.

[0023] In this embodiment, a damper baffle 8 is fixedly connected to the end of the damper shaft 5 located inside the damper frame. The outline of the damper baffle 8 is adapted to the cross-sectional shape of the air duct inside the damper frame. The adaptation of the damper baffle 8 to the air duct cross-section reduces the pressure impact of airflow disturbance on the sealing area and improves sealing stability.

[0024] In this embodiment, an actuator rocker arm 6 is fitted onto the outer end of the damper shaft 5. The actuator rocker arm 6 is detachably connected to the damper shaft 5 via a radially penetrating fixing pin. The fixing pin connects the actuator rocker arm 6, enabling quick assembly and disassembly and avoiding the impact of welded structures on maintenance efficiency.

[0025] In this embodiment, the flexible packing 3 is made of a self-lubricating flexible sealing material with a temperature resistance of over 600°C. Its filling thickness is greater than the depth of the stuffing box and it has axial compression allowance. The 600°C-resistant self-lubricating flexible packing 3 maintains elasticity at high temperatures, and the filling allowance compensates for thermal deformation and wear, extending its service life.

[0026] In this embodiment, the threaded engagement length between the bearing housing 2 and the sealing gland 4 is greater than 1.2 times the axial depth of the stuffing box, forming an adjustable axial clamping stroke. The threaded engagement length exceeding the stuffing box by 1.2 times ensures redundant adjustment stroke of the gland 4, preventing thread stripping failure.

[0027] Working Principle: Bearing Isolation: Bearing 1 is embedded in the inner wall of the damper frame, and bearing seat 2 is welded to the outer wall of the frame, forming an independent cavity to isolate high-temperature fly ash and prevent the shaft system 5 from directly contacting the frame and causing friction; Dynamic Sealing: Flexible packing 3 fills the stuffing box of bearing seat 2, and axial pressure is generated by screwing in the threaded cover 4 to form a sealing interface that adapts to the rotation of damper shaft 5; High Temperature Compensation: The self-lubricating properties of flexible packing 3 reduce rotational resistance, and its elastic modulus changes little with temperature, ensuring that it can still tightly fit the shaft surface at 600℃; Online Maintenance: The packing clamping amount can be adjusted by screwing on the hexagonal cover 4, without disassembling the actuator rocker arm 6, realizing maintenance without stopping the machine.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A flexible sealing device for preventing jamming and ash leakage in the secondary air damper bearing of a burner, characterized in that: The device includes a bearing (1), a bearing housing (2), a flexible packing (3), a sealing cap (4), and a damper shaft (5). The bearing (1) is fixedly installed on the inner wall of the damper frame, and the bearing housing (2) is fixedly connected to the outer wall of the damper frame and forms an installation cavity that mates with the bearing (1). The damper shaft (5) passes through the axial through holes of the bearing (1) and the bearing housing (2) and forms a rotational fit with the inner ring of the bearing (1). A stuffing box is provided at the end of the bearing housing (2) away from the damper frame, and the flexible packing (3) is filled in the stuffing box and forms a sealing fit with the damper shaft (5). The sealing cap (4) is connected to the end of the bearing housing (2) by a threaded connection to form an axial pressing structure for the flexible packing (3).

2. The flexible sealing device for preventing jamming and ash leakage of the secondary air damper bearing of the burner according to claim 1, characterized in that: The outer circumference of the sealing cap (4) is hexagonal, and its inner hole forms a clearance fit with the damper shaft (5).

3. The flexible sealing device for preventing jamming and ash leakage of the secondary air damper bearing of the burner according to claim 1, characterized in that: The damper shaft (5) is fixedly connected to a damper baffle (8) at the end located inside the damper frame. The outline of the damper baffle (8) is adapted to the cross-sectional shape of the air duct inside the damper frame.

4. The flexible sealing device for preventing jamming and ash leakage of the secondary air damper bearing of the burner according to claim 1, characterized in that: An actuator rocker arm (6) is fitted onto the outer end of the damper shaft (5), and the actuator rocker arm (6) is detachably connected to the damper shaft (5) by a radially penetrating fixing pin.

5. The flexible sealing device for preventing jamming and ash leakage of the secondary air damper bearing of the burner according to claim 1, characterized in that: The flexible packing (3) is made of a self-lubricating flexible sealing material with a temperature resistance of 600℃ or higher, and its filling thickness is greater than the depth of the stuffing box and has axial compression allowance.

6. The flexible sealing device for preventing jamming and ash leakage of the secondary air damper bearing of the burner according to claim 1, characterized in that: The threaded fit length between the bearing housing (2) and the sealing gland (4) is greater than 1.2 times the axial depth of the stuffing box, forming an adjustable axial pressing stroke.

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