A guide bearing box fixing device

Abstract

The utility model provides a kind of guide bearing box fixing device, belong to rotary air preheater field.The existing rotary air preheater in solution, because the bearing box platen and support sliding out of step caused by guide bearing box two sides fixed bolt tightening moment difference, further cause rotor deflection, sealing piece friction aggravation, current fluctuation even equipment problem of jam stop.Guide bearing box fixing device includes connecting component and limiting component, connecting component includes web, support plate, wing plate and connecting plate, connecting plate is connected with guide bearing box platen, connecting plate is connected in web, multiple support plates are arranged in parallel interval in web lower side, support plate both sides are connected with wing plate, the top of wing plate is connected with web perpendicularly, support plate is connected with hot end center truss shell, two limiting components are set in the two sides of connecting plate, it is mainly used for guide bearing box fixing.

Description

Technical Field

[0001] This utility model belongs to the field of rotary air preheaters, and in particular relates to a guide bearing box fixing device. Background Technology

[0002] Rotary air preheaters are the core regenerative heat exchangers in thermal power plant boilers. They use rotating heat storage elements to alternately absorb waste heat from flue gas and heat combustion air, thus achieving waste heat recovery and energy saving.

[0003] The existing rotary air preheater guide bearing housing fixing method is shown in the figure. Figures 6-9 Specifically, the method involves machining eight round holes on the guide bearing housing plate, then fixing it to the hot end center truss bracket with bolts through these eight round holes, and simultaneously adding limiting blocks around the guide bearing housing plate for positioning.

[0004] During air preheater operation, flue gas heats the heat storage elements from top to bottom, while air absorbs heat from bottom to top. The hot end of the metal expands significantly, while the cold end expands less. Furthermore, the rotor's central cylinder expands upwards due to the high temperature, while the outer edge expands downwards due to the influence of the cold air. This difference in expansion between the upper and lower, and inner and outer sides, causes the rotor to exhibit a mushroom shape. This creates a radial eccentric force on the guide bearing housing, causing it to shift radially (horizontally). Current guide bearing housing fixation primarily relies on bolts on both sides. When the tightening torque of these bolts differs, the bearing housing platform and support slide asynchronously, leading to a change in the bearing housing's center and rotor misalignment. Rotating under eccentric conditions intensifies friction on the sealing plates, resulting in increased or fluctuating current. In severe cases, the air preheater may seize up, affecting the unit's normal operation. Utility Model Content

[0005] In view of this, the present invention aims to propose a guide bearing housing fixing device to solve the problem in the existing rotary air preheater where the bearing housing platform and the support slide asynchronously due to the different tightening torque of the fixing bolts on both sides of the guide bearing housing, which in turn causes rotor skew, increased friction of the sealing sheet, current fluctuations, or even equipment jamming.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a guide bearing housing fixing device, wherein the guide bearing housing fixing device is symmetrically installed on both sides of the guide bearing housing platform, the guide bearing housing fixing device includes a connecting assembly and a limiting assembly, the connecting assembly includes a web plate, a support plate, a wing plate and a connecting plate, the connecting plate is connected to the guide bearing housing platform, the connecting plate is connected to the web plate, a plurality of support plates are arranged parallel and spaced below the web plate, a wing plate is connected to both sides of the support plate, the top of the wing plate is perpendicularly connected to the web plate, the support plate is connected to the hot end center truss slot shell, and two limiting assemblies are provided on the web plate, the two limiting assemblies are respectively arranged on both sides of the connecting plate.

[0007] Furthermore, the limiting component includes a limiting plate and two ribs, which are connected to the side of the limiting plate. The limiting plate is positioned opposite to the connecting plate, and both the limiting plate and the ribs are connected to the web plate.

[0008] Furthermore, the web is a steel plate with bevels.

[0009] Furthermore, the thickness of the web is 25 mm.

[0010] Furthermore, the wing plate is made of steel plate with a thickness of 25mm.

[0011] Furthermore, the support plate is made of steel plate with a thickness of 20mm.

[0012] Furthermore, the connecting plate is made of steel plate with a thickness of 25mm.

[0013] Furthermore, the limiting plate is made of steel plate with a thickness of 16mm.

[0014] Furthermore, the rib is made of steel plate with a thickness of 12mm.

[0015] Furthermore, the connecting plate is welded to the guide bearing housing platform, and the support plate is welded to the hot end center truss slot shell.

[0016] Compared with existing technologies, the beneficial effects of this utility model are as follows: the connecting plate of the guide bearing housing fixing device is welded to the guide bearing housing platform, and the support plate is welded to the hot end central truss slot shell. This structure allows the guide bearing housing platform and the hot end central truss support to slide synchronously, thus ensuring that the guide bearing housing always operates in the central position. The rotor can run stably around the central axis, solving the problem of increased or fluctuating current caused by increased friction of the sealing sheet during operation, meeting the requirements of the air preheater for sealing gap, maintaining a good sealing effect, and effectively reducing the air leakage rate. The current remains stable, ensuring the performance of the air preheater, avoiding equipment shutdown due to rotor misalignment, and ensuring the normal operation of the unit. Attached Figure Description

[0017] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the installation plan of a guide bearing housing fixing device according to the present invention; Figure 2 The present utility model Figure 1 Schematic diagram of the cross-sectional structure of the middle AA section; Figure 3 This is a schematic diagram of the structure of a guide bearing housing fixing device according to the present invention; Figure 4 This is a schematic diagram of the limiting component structure described in this utility model; Figure 5 This is a three-dimensional structural diagram of the guide bearing housing fixing device of the present invention. Figure 6 This is a schematic diagram of the existing guide bearing housing fixing structure described in this utility model; Figure 7 The present utility model Figure 6 Schematic diagram of the cross-sectional structure of the middle AA section; Figure 8 The present utility model Figure 6 Schematic diagram of the cross-sectional structure of the middle BB section; Figure 9 This is a three-dimensional schematic diagram of the existing guide bearing housing fixing structure described in this utility model.

[0018] In the picture: 1-Guide bearing housing fixing device, 2-Guide bearing housing platform, 3-Hot end center truss slot shell, 4-Web plate, 5-Support plate, 6-Wing plate, 7-Connecting plate, 8-Limiting component, 9-Limiting plate, 10-Rib plate, 11-Guide bearing housing, 12-Hot end center truss, 13-Hot end center truss bracket, 14-Bolt, 15-Limiting block. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.

[0020] See Figure 1-5This embodiment describes a guide bearing housing fixing device. The guide bearing housing fixing device 1 is symmetrically installed on both sides of the guide bearing housing platform 2. The guide bearing housing fixing device 1 includes a connecting assembly and a limiting assembly 8. The connecting assembly includes a web plate 4, a support plate 5, a wing plate 6, and a connecting plate 7. The connecting plate 7 is welded to the guide bearing housing platform 2 and is connected to the web plate 4. Multiple support plates 5 are arranged parallel to each other below the web plate 4. Wing plates 6 are connected to both sides of the support plate 5. The top of the wing plate 6 is perpendicularly connected to the web plate 4. The support plate 5 is welded to the hot end center truss slot shell 3. Two limiting assemblies 8 are provided on the web plate 4, and the two limiting assemblies 8 are respectively arranged on both sides of the connecting plate 7.

[0021] The limiting component 8 includes a limiting plate 9 and two ribs 10. The two ribs 10 are connected to the side of the limiting plate 9. The limiting plate 9 is positioned opposite to the connecting plate 7. Both the limiting plate 9 and the ribs 10 are connected to the web plate 4.

[0022] The web plate 4 is a steel plate with a bevel. The thickness of the web plate 4 is 25mm. The wing plate 6 is a steel plate with a thickness of 25mm. The support plate 5 is a steel plate with a thickness of 20mm. The connecting plate 7 is a steel plate with a thickness of 25mm. The limiting plate 9 is a steel plate with a thickness of 16mm. The rib plate 10 is a steel plate with a thickness of 12mm.

[0023] During installation, the connecting plate 7 of the guide bearing housing fixing device 1 is welded and fixed to the guide bearing housing platform 2, and its support plate 5 is welded and fixed to the hot end center truss slot shell 3. This welding connection replaces the original bolt 14 connection, making the connection between the guide bearing housing platform 2 and the hot end center truss support 13 more robust and integrated. When the air preheater is running, the rotor expands in a mushroom shape due to the temperature difference between the upper and lower, and the inside and outside, which will generate a radial eccentric force on the guide bearing housing 11. At this time, the welded guide bearing housing fixing device 1 can ensure that the guide bearing housing platform 2 and the hot end center truss support 13 slide synchronously, avoiding the problem of asynchronous sliding caused by different tightening torques of the bolts on both sides. The limiting plate 9 in the limiting assembly 8 is set opposite to the connecting plate 7, which plays a further limiting role and prevents the guide bearing housing 11 from radially displacing. The rib plate 10 is used to strengthen the structural strength of the limiting plate 9. As a result, the guide bearing housing 11 can always maintain its central position, and the rotor can rotate stably around the central axis. This solves the problem of increased friction of the sealing sheet, meets the sealing gap requirements, reduces the air leakage rate, keeps the current stable, and ensures the performance and safe and stable operation of the air preheater.

[0024] The specific embodiments of this utility model disclosed above are merely illustrative of the present utility model. These specific embodiments do not exhaustively describe all details, nor do they limit the utility model to only the described embodiments. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it.

Claims

1. A guide bearing housing fixing device, characterized in that: The guide bearing housing fixing device (1) is symmetrically installed on both sides of the guide bearing housing platform (2). The guide bearing housing fixing device (1) includes a connecting component and a limiting component (8). The connecting component includes a web plate (4), a support plate (5), a wing plate (6), and a connecting plate (7). The connecting plate (7) is connected to the guide bearing housing platform (2) and is connected to the web plate (4). Multiple support plates (5) are arranged parallel to each other below the web plate (4). Wing plates (6) are connected to both sides of the support plate (5). The top of the wing plate (6) is vertically connected to the web plate (4). The support plate (5) is connected to the hot end center truss slot shell (3). Two limiting components (8) are provided on the web plate (4). The two limiting components (8) are respectively arranged on both sides of the connecting plate (7).

2. The guide bearing housing fixing device according to claim 1, characterized in that: The limiting component (8) includes a limiting plate (9) and a rib plate (10). There are two rib plates (10). The two rib plates (10) are connected to the side of the limiting plate (9). The limiting plate (9) is opposite to the connecting plate (7). Both the limiting plate (9) and the rib plate (10) are connected to the web plate (4).

3. The guide bearing housing fixing device according to claim 1, characterized in that: The web (4) is a steel plate with a bevel.

4. The guide bearing housing fixing device according to claim 3, characterized in that: The thickness of the web (4) is 25 mm.

5. The guide bearing housing fixing device according to claim 1, characterized in that: The wing plate (6) is a steel plate with a thickness of 25mm.

6. The guide bearing housing fixing device according to claim 1, characterized in that: The support plate (5) is a steel plate with a thickness of 20mm.

7. The guide bearing housing fixing device according to claim 1, characterized in that: The connecting plate (7) is a steel plate with a thickness of 25mm.

8. A guide bearing housing fixing device according to claim 2, characterized in that: The limiting plate (9) is a steel plate with a thickness of 16mm.

9. A guide bearing housing fixing device according to claim 8, characterized in that: The rib (10) is a steel plate with a thickness of 12mm.

10. A guide bearing housing fixing device according to claim 1, characterized in that: The connecting plate (7) is welded to the guide bearing housing plate (2), and the support plate (5) is welded to the hot end center truss slot shell (3).

Images