Bearing housing for steam turbine unit in self-lubricating form

Abstract

This invention relates to a self-lubricating bearing housing for steam turbine units, belonging to the technical field of thermal power steam turbines. This invention solves the technical problem of uneven force distribution and poor sliding of existing sliding bearing housings in the ultra-high pressure section of thermal power steam turbine units due to their structural limitations. Multiple self-lubricating alloy blocks are installed on the top surface of the base frame, and multiple steel plates are installed on the bottom of the bearing housing. The positions of the steel plates correspond to the positions of the self-lubricating alloy blocks, and the bottom surfaces of the steel plates contact the top surfaces of the self-lubricating alloy blocks. The bearing housing is slidably mounted above the base frame. A guide key is fixedly installed on the top surface of the base frame, and a keyway is provided on the bottom of the bearing housing, with the keyway and guide key slidingly engaging axially. Bearing housing pressure plates are installed at both the left and right ends of the bearing housing, with the bottom of the pressure plates fixed to the top surface of the base frame, thereby limiting the height of the bearing housing. This improves the sliding efficiency of the bearing housing. This invention is used for bearing housings in steam turbine units.

Description

Technical Field

[0001] This utility model relates to a self-lubricating bearing housing for steam turbine units, belonging to the field of thermal power steam turbine technology. Background Technology

[0002] Over the past 20 years, with the development of thermal power turbine technology and changes in the economic environment, my country's thermal power turbines have gradually evolved into high-parameter units of the ultra-supercritical 1000MW class, with increasingly stringent requirements for unit operational stability. To address the issue of poor expansion in the ultra-high-pressure sections of some 1000MW units and reduce the possibility of bearing housing slippage and jamming, a self-lubricating bearing housing for turbine units needs to be designed.

[0003] Previously, most of the sliding bearing housings in the ultra-high pressure section of 1000MW-class thermal power turbine units adopted a non-self-lubricating method, that is, injecting lubricating grease between the lower part of the bearing housing and the base frame to reduce the coefficient of friction and ensure smooth sliding of the bearing housing. However, in actual operation, the load on the bearing housing is inconsistent with the design load, which can easily cause uneven stress on the bearing housing and lead to poor sliding. Moreover, as the unit operates for a longer period of time, impurities can easily enter between the lower part of the bearing housing and the base frame, affecting the sliding of the bearing housing.

[0004] In summary, due to its own structural reasons, the existing sliding bearing housings in the ultra-high pressure section of thermal power turbine units have a technical problem of uneven stress on the bearing housings, which leads to poor sliding of the bearing housings. Utility Model Content

[0005] This utility model aims to solve the technical problem of uneven force distribution in the sliding bearing housing of the ultra-high pressure section of existing thermal power turbine units, which leads to poor sliding of the bearing housing due to its own structural reasons. Therefore, it provides a self-lubricating bearing housing for turbine units, which includes a bearing housing body, a steel plate, a bearing housing pressure plate, a base frame, a self-lubricating alloy block and a guide key.

[0006] Multiple self-lubricating alloy blocks are installed on the top surface of the base frame, and multiple steel plates are installed on the bottom of the bearing housing. The number of steel plates is the same as the number of self-lubricating alloy blocks, the position of the steel plates corresponds to the position of the self-lubricating alloy blocks, and the bottom surface of the steel plates contacts the top surface of the self-lubricating alloy blocks.

[0007] The bearing housing is slidably mounted on the base frame. A guide key is fixedly mounted on the top surface of the base frame. A keyway is provided at the bottom of the bearing housing. The keyway and the guide key slide together axially.

[0008] Bearing housing pressure plates are installed at both the left and right ends of the bearing housing. The bottom of the bearing housing pressure plates is fixed to the top surface of the base frame, and the height of the bearing housing is limited by the bearing housing pressure plates.

[0009] As another improvement of this utility model, it also includes a fixed frame and frame bolts. The fixed frame is installed on the top surface of the base frame by the frame bolts, and the self-lubricating alloy block is installed inside the fixed frame.

[0010] As another improvement of this utility model, it also includes steel plate fixing bolts, and the steel plate is installed at the bottom of the bearing housing by the steel plate fixing bolts.

[0011] As another improvement of this utility model, it also includes a guide key fixing bolt, wherein the guide key is mounted on the top surface of the base frame by the guide key fixing bolt.

[0012] As another improvement of this utility model, the guide key is installed on the top surface of the base frame along the center line of the bearing housing.

[0013] As another improvement of this utility model, the top surface of the base frame is provided with a mounting groove, and the guide key is installed in the mounting groove by an interference fit, with the upper part of the guide key protruding from the top surface of the base frame.

[0014] As another improvement of this utility model, it also includes pressure plate bolts and pressure plate nuts. The left and right ends of the base frame are provided with through holes, and the pressure plate is installed at the top of the through holes by pressure plate bolts and pressure plate nuts.

[0015] As another improvement of this utility model, the number of steel plates is set to 6.

[0016] As another improvement of this utility model, an assembly gap is provided between the inner side of the bearing housing pressure plate and the bearing housing body.

[0017] As another improvement of this utility model, the width of the assembly gap is 2-3mm.

[0018] The beneficial effects of this utility model are:

[0019] 1. The self-lubricating bearing housing replaces the sliding medium with a self-lubricating alloy. During unit operation, the sliding of the bearing housing is borne by the self-lubricating blocks and stainless steel plates, achieving friction reduction and wear resistance under oil-free conditions; thus enhancing the sliding efficiency of the bearing housing. The self-lubricating alloy blocks have the characteristics of low friction coefficient, good wear resistance, and relatively simple maintenance.

[0020] 2. Guide keys are installed between the base frame and the center line of the bearing housing to ensure that the bearing housing only slides axially, thereby enhancing the stability of the structure.

[0021] 3. Pressure plates are installed around the bottom plate of the bearing housing to prevent the bearing housing from tilting upwards due to uneven stress during operation; this enhances the stability of the overall structure during operation. Attached Figure Description

[0022] Figure 1This is a front view schematic diagram of a self-lubricating bearing housing for a steam turbine unit according to this utility model.

[0023] Figure 2 This is a top view schematic diagram of a self-lubricating bearing housing for a steam turbine unit according to this utility model.

[0024] Figure 3 This is a schematic diagram of the steel plate installation at the bottom of the bearing housing.

[0025] Figure 4 This is a schematic diagram of the pressure plate assembly.

[0026] Figure 5 yes Figure 1 Enlarged diagram of point B in the middle.

[0027] Figure 6 It is along Figure 5 A partial cross-sectional view of line AA in the middle.

[0028] Figure 7 This is a top view of the base frame. Detailed Implementation

[0029] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. All embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model. In the description of this utility model, it should be noted that the positional relationships indicated by terms such as "upper," "lower," "left," and "right" are only based on the positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model, and are not intended to indicate or imply that the referred components have a specific orientation, or are constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Specific implementation method one: Combining Figures 1 to 7 This embodiment describes a self-lubricating bearing housing for a steam turbine unit, which includes a bearing housing body 1, a steel plate 2, a bearing housing pressure plate 3, a base frame 4, a self-lubricating alloy block 5, and a guide key 6.

[0031] Multiple self-lubricating alloy blocks 5 are installed on the top surface of the base frame 4, and multiple steel plates 2 are installed on the bottom of the bearing housing 1. The number of steel plates 2 is the same as the number of self-lubricating alloy blocks 5, the position of the steel plates 2 corresponds to the position of the self-lubricating alloy blocks 5, and the bottom surface of the steel plates 2 contacts the top surface of the self-lubricating alloy blocks 5.

[0032] The bearing housing 1 is slidably mounted on the base frame 4. A guide key 6 is fixedly mounted on the top surface of the base frame 4. A keyway 9 is provided at the bottom of the bearing housing 1. The keyway 9 and the guide key 6 slide together axially.

[0033] Bearing housing 1 is equipped with bearing housing pressure plates 3 at both the left and right ends. The bottom of the bearing housing pressure plates 3 is fixed to the top surface of the base frame 4. The bearing housing pressure plates 3 are used to limit the height of the bearing housing 1.

[0034] The self-lubricating bearing housing uses a self-lubricating alloy as the sliding medium. During unit operation, the sliding of the bearing housing is borne by the self-lubricating blocks and stainless steel plates, achieving friction reduction and wear resistance even without oil, thus enhancing the sliding efficiency of the bearing housing. The self-lubricating alloy blocks have a low coefficient of friction, good wear resistance, and are relatively easy to maintain. Guide keys are installed between the base frame and the bearing housing to ensure that the bearing housing only slides axially, enhancing the stability of the structure. Pressure plates are installed around the bottom plate of the bearing housing to prevent the bearing housing from tilting upwards due to uneven stress during operation, further enhancing the overall structural stability during operation.

[0035] Specific Implementation Method Two: Combining Figures 1 to 7 This embodiment differs from specific embodiment one in that it also includes a fixing frame 7 and frame bolts. The fixing frame 7 is mounted on the top surface of the base frame 4 via frame bolts, and the self-lubricating alloy block 5 is installed inside the fixing frame 7. This design simplifies installation and ensures structural reliability. Other components and connection methods are the same as in specific embodiment one.

[0036] Specific implementation method three: Combining Figures 1 to 7 This embodiment differs from specific embodiment one in that it also includes steel plate fixing bolts, which secure the steel plate to the bottom of the bearing housing. Preferably, the steel plate used in the device is stainless steel. This design simplifies installation and ensures structural reliability. Other components and connection methods are the same as in specific embodiment one or two.

[0037] Specific implementation method four: Combination Figures 1 to 7 This embodiment differs from specific embodiment one in that it also includes a guide key fixing bolt. The guide key 6 is mounted on the top surface of the base frame 4 via the guide key fixing bolt. This design simplifies installation and ensures structural reliability. Other components and connection methods are the same as in any one of specific embodiments one to three.

[0038] Specific Implementation Method Five: Combining Figures 1 to 7This embodiment differs from specific embodiment one in that the guide key 6 is mounted on the top surface of the base frame 4 along the centerline of the bearing housing 1. This ensures that the bearing housing only slides axially, enhancing structural stability. Other components and connection methods are the same as in any one of specific embodiments one through four.

[0039] Specific Implementation Method Six: Combination Figure 5 This embodiment differs from specific embodiment one in that the top surface of the base frame 4 is provided with a mounting groove, and the guide key 6 is installed in the mounting groove by an interference fit. The upper part of the guide key 6 protrudes from the top surface of the base frame 4. This design results in a simple and reliable structure. Other components and connection methods are the same as any one of specific embodiments one to five.

[0040] Specific implementation method seven: Combining Figure 4 This embodiment differs from specific embodiment one in that it also includes pressure plate bolts and pressure plate nuts. Through holes are provided at both ends of the base frame, and the pressure plate is installed at the top of the through holes via the pressure plate bolts and pressure plate nuts. This design facilitates installation and provides a simple and reliable structure. Other components and connection methods are the same as in any one of specific embodiments one through six.

[0041] Specific implementation method eight: Combination Figure 3 This embodiment differs from specific embodiment one in that it uses six steel plates 2. The steel plates are arranged evenly and symmetrically, with a one-to-one correspondence between the self-lubricating alloy block and the steel plate. Preferably, the number of steel plates can be adjusted according to the size of the bottom surface of the bearing housing. Other components and connection methods are the same as any one of specific embodiments one to seven.

[0042] Specific Implementation Method Nine: Combining Figure 4 This embodiment differs from specific embodiment one in that an assembly gap 8 is provided between the inner side of the bearing housing pressure plate 3 and the bearing housing 1. This assembly gap facilitates the installation and operation of the device. Other components and connection methods are the same as any one of specific embodiments one through eight.

[0043] Specific Implementation Method Ten: Combining Figure 4 This embodiment differs from specific embodiment one in that the width of the assembly gap 8 is 2-3 mm. This assembly gap facilitates the installation and operation of the device. Other components and connection methods are the same as any one of specific embodiments one through nine.

[0044] Combination Figures 1 to 7 Explanation of the working principle of this utility model:

[0045] During unit operation, the sliding of the bearing housing is supported by self-lubricating blocks and stainless steel plates, enhancing the sliding efficiency of the bearing housing. The self-lubricating alloy blocks feature a low coefficient of friction, good wear resistance, and relatively simple maintenance. Guide keys are installed between the base frame and the bearing housing to ensure that the bearing housing only slides axially, enhancing structural stability. Pressure plates are installed around the bottom plate of the bearing housing to prevent it from tilting upwards due to uneven stress during operation, further enhancing the overall structural stability during operation.

[0046] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A self-lubricating bearing housing for a steam turbine unit, characterized in that... It includes a bearing housing (1), a steel plate (2), a bearing housing pressure plate (3), a base frame (4), a self-lubricating alloy block (5), and a guide key (6); Multiple self-lubricating alloy blocks (5) are installed on the top surface of the base frame (4), and multiple steel plates (2) are installed on the bottom of the bearing housing (1). The number of steel plates (2) is the same as the number of self-lubricating alloy blocks (5), the position of the steel plates (2) corresponds to the position of the self-lubricating alloy blocks (5), and the bottom surface of the steel plates (2) contacts the top surface of the self-lubricating alloy blocks (5). The bearing housing (1) is slidably mounted on the base frame (4). A guide key (6) is fixedly mounted on the top surface of the base frame (4). A keyway (9) is provided at the bottom of the bearing housing (1). The keyway (9) and the guide key (6) slide together axially. Bearing housing (1) is equipped with bearing housing pressure plates (3) at both the left and right ends. The bottom of the bearing housing pressure plate (3) is fixed on the top surface of the base frame (4). The bearing housing (1) is height-limited by the bearing housing pressure plate (3).

2. The self-lubricating bearing housing for a steam turbine unit according to claim 1, characterized in that... It also includes a fixed frame (7) and frame bolts, the fixed frame (7) being mounted on the top surface of the base frame (4) by the frame bolts, and a self-lubricating alloy block (5) being mounted inside the fixed frame (7).

3. A self-lubricating bearing housing for a steam turbine unit according to claim 1, characterized in that... It also includes steel plate fixing bolts, and the steel plate (2) is installed at the bottom of the bearing housing (1) by the steel plate fixing bolts.

4. A self-lubricating bearing housing for a steam turbine unit according to claim 1, characterized in that... It also includes a guide key fixing bolt, the guide key (6) is installed on the top surface of the base frame (4) by the guide key fixing bolt.

5. A self-lubricating bearing housing for a steam turbine unit according to claim 4, characterized in that, The guide key (6) is installed on the top surface of the base frame (4) along the center line direction of the bearing housing (1).

6. A self-lubricating bearing housing for a steam turbine unit according to claim 4, characterized in that, The top surface of the base frame (4) is provided with a mounting groove, and the guide key (6) is installed in the mounting groove by an interference fit. The upper part of the guide key (6) protrudes from the top surface of the base frame (4).

7. A self-lubricating bearing housing for a steam turbine unit according to claim 1, characterized in that... It also includes pressure plate bolts and pressure plate nuts. The left and right ends of the base frame (4) are provided with through holes. The pressure plate is installed at the top of the through hole by pressure plate bolts and pressure plate nuts.

8. A self-lubricating bearing housing for a steam turbine unit according to claim 1, characterized in that, The number of steel plates (2) is set to 6.

9. A self-lubricating bearing housing for a steam turbine unit according to claim 1, characterized in that, An assembly gap (8) is provided between the inner side of the bearing housing pressure plate (3) and the bearing housing body (1).

10. A self-lubricating bearing housing for a steam turbine unit according to claim 9, characterized in that, The width of the assembly gap (8) is 2-3 mm.

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