Steam turbine elastic support structure with thermal compensation

Abstract

The utility model discloses a steam turbine elastic support structure with heat compensation, including cylinder body, the bottom disc of being located cylinder body downside and install between cylinder body and the elastic support of bottom disc, the upper and lower both ends of elastic support are detachable connection through bolt with cylinder body and bottom disc respectively, be equipped with the adjusting seat on the bottom disc, and be connected with the adjusting bolt of adjusting seat on screw thread, adjusting bolt sets up along the thermal expansion direction of cylinder body, and the lower end of elastic support is abutted with the front end of adjusting bolt, and the lower end of elastic support can be pushed to the end of the thermal expansion direction and shift relative to the upper end through the rotation adjusting bolt. The above-mentioned support structure can make the lower end of elastic support shift relative to the upper end in the thermal expansion direction through the rotation adjusting bolt, produce pre-deformation, make elastic support can adapt to the greater thermal expansion variation of cylinder body, effectively improve the safety margin of working in high temperature and long axle distance unit, and its simple structure is more widely used.

Description

Technical Field

[0001] This utility model relates to the field of steam turbine equipment, specifically to a steam turbine elastic support structure with thermal compensation. Background Technology

[0002] A steam turbine is a rotary steam power unit that converts the thermal energy of steam into mechanical energy to drive various pumps, fans, compressors, and generators. Since the working fluid in a steam turbine is typically high-temperature, high-pressure steam, mechanical components such as the cylinders undergo thermal expansion during operation due to temperature increases. This expansion occurs in multiple directions, increasing the distance between the front and rear bearing seats on both sides of the cylinder. If the cylinder and chassis are fixedly connected, the cylinder cannot expand freely, leading to excessive stress and damage to the turbine body. To address this thermal expansion, existing steam turbine bodies are rigidly connected to a common chassis via elastic supports. These supports act as elastic support structures to bear the unit's load. Utilizing the flexibility of the elastic supports, they bend and deform to accommodate the turbine's expansion, absorbing the thermal expansion and ensuring the turbine's normal operation. However, existing flexible supports are mainly designed for units with low operating temperatures and short bearing spacing. Their operating temperature is generally designed to be 400℃, and the bearing spacing is generally within 1500mm, which limits their application range. When used in environments with operating temperatures above 400℃ and bearing spacing greater than 1500mm, the thermal expansion of the cylinder structure will further increase to more than 3mm. This will cause the flexible support to deform too much, lacking sufficient safety margin, making it difficult for the turbine to operate normally. It will also cause problems such as large offset of the unit shaft center, resulting in excessive vibration. Utility Model Content

[0003] The purpose of this invention is to overcome the problems existing in the above-mentioned background technology and provide a steam turbine elastic support structure with thermal compensation that is simple in structure and can be adapted to operation in units with higher temperatures and longer shaft distances.

[0004] The thermally compensated turbine elastic support structure of this utility model includes a cylinder body, a chassis located below the cylinder body, and an elastic bracket installed between the cylinder body and the chassis. The upper and lower ends of the elastic bracket are detachably connected to the cylinder body and the chassis by bolts, respectively. An adjusting seat is provided on the chassis, and an adjusting bolt is threaded onto the adjusting seat. The adjusting bolt is set along the thermal expansion direction of the cylinder body, and the front end of the adjusting bolt abuts against the lower end of the elastic bracket. By rotating the adjusting bolt, the lower end of the elastic bracket can be pushed to shift relative to the upper end in the thermal expansion direction.

[0005] The thermally compensated turbine elastic support structure consists of an elastic bracket supporting the turbine cylinder body on a chassis. An adjusting seat is installed on the chassis, with an adjusting bolt threaded onto the adjusting seat that abuts against the lower end of the elastic bracket. Before fixing the lower end of the elastic bracket to the chassis, rotating the adjusting bolt applies an axial thrust to the lower end of the elastic bracket, causing a slight positional shift relative to the upper end towards the thermal expansion direction of the cylinder body. This pre-deformation of the lower side of the elastic bracket results in pre-deformation. After adjustment, the lower end of the elastic bracket is fixed to the chassis using bolts. When the turbine is in use, the cylinder body experiences temperature rise... The cylinder expands due to heat and applies an axial thrust to the upper end of the elastic support connected to it. This causes the upper end of the elastic support to shift in the direction of thermal expansion. Since the lower end of the elastic support has already deformed a certain distance in the direction of thermal expansion, it can support the upper end of the elastic support to shift a greater distance in the direction of thermal expansion relative to the lower end. This allows the elastic support to adapt to a larger amount of thermal expansion change in the cylinder body without exceeding the maximum deformation of the elastic support. This avoids damage caused by excessive deformation of the elastic support to one side, effectively improving the safety margin of the above support structure in high-temperature and long-wheelbase units. Its structure is simple, easy to use, and has a wider range of applications.

[0006] As an improvement of this utility model, the lower end of the elastic bracket is offset by 3-6mm in the direction of thermal expansion.

[0007] As an improvement of this utility model, the upper end of the elastic bracket is provided with a vertical flange, which is fixedly connected to the cylinder body by bolts.

[0008] As an improvement of this utility model, the lower end of the elastic bracket is provided with a horizontal flange, which is fixedly connected to the chassis by bolts.

[0009] As an improvement of this utility model, a pad is also provided between the lower end of the elastic bracket and the chassis, and the pad is fixed to the chassis by bolts. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model.

[0011] Figure 2 This is a reference diagram showing the usage state of this utility model.

[0012] Figure 3 This is a three-dimensional structural diagram of the elastic support of this utility model.

[0013] In the diagram: 1-Cylinder body; 2-Chassis; 3-Elastic support; 31-Vertical flange; 32-Horizontal flange; 4-Adjusting seat; 5-Adjusting bolt; 6-Bolt; 7-Pan; 8-Front bearing seat; L-Offset; D-Direction of thermal expansion of the cylinder body. Detailed Implementation

[0014] The technical solutions of 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 a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0015] It should be noted that if any directional indication (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.) is involved in the embodiments of this utility model, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0016] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0017] If the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Furthermore, the technical features of each embodiment can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the embodiments are described; however, as long as these combinations of technical features do not contradict each other, they should all be considered within the scope of this specification.

[0018] like Figures 1 to 3 As shown, this utility model provides a steam turbine elastic support structure with thermal compensation.

[0019] In this embodiment, the thermally compensated turbine elastic support structure includes a cylinder body 1, a chassis 2 located below the cylinder body 1, and an elastic bracket 3 installed between the cylinder body 1 and the chassis 2. The upper and lower ends of the elastic bracket 3 are detachably connected to the cylinder body 1 and the chassis 2 respectively by bolts 6. The chassis 2 is provided with an adjusting seat 4, and an adjusting bolt 5 is threadedly connected to the adjusting seat 4. The adjusting bolt 5 is set along the thermal expansion direction of the cylinder body 1, and the front end of the adjusting bolt 5 abuts against the lower end of the elastic bracket 3. By rotating the adjusting bolt 5, the lower end of the elastic bracket 3 can be pushed to shift relative to the upper end in the thermal expansion direction. The cylinder body 1 has a front bearing seat 8 and a rear bearing seat (not shown in the figure) installed at both ends. The bearing distance between the two bearing seats changes with the thermal expansion of the cylinder body 1. The elastic support 3 is used to bear the load of the turbine unit and can adopt the elastic support structure commonly used in this field. The adjusting bolt 5 performs a pre-jacking operation on the elastic support 3, so that it is pre-deformed before the turbine starts working, as a thermal compensation for the support structure. The pre-jacking dimension of the adjusting bolt 5 must meet the requirements of the thermal expansion of the cylinder body. The offset L of the lower end of the elastic support 3 relative to the upper end in the direction of thermal expansion needs to be calculated and adjusted according to the material properties and parameters of the elastic support 3, so that the offset is determined within the elastic deformation range of the elastic support 3. This allows the elastic support 3 to adapt to units with higher operating temperatures and longer bearing spacing, ensuring that the elastic support 3 still has sufficient safety margin when the thermal expansion of the cylinder structure increases, avoiding problems such as excessive vibration caused by large offset of the unit shaft center, and maintaining normal operation of the steam turbine. Preferably, the offset L of the lower end of the elastic support 3 in the direction of thermal expansion can be set to 3-6mm, so that the steam turbine can support operating temperatures of 400℃ to 540℃, thereby enabling the unit to be used at higher temperatures and effectively expanding its application range.

[0020] Reference Figure 2 As shown, the thermally compensated turbine elastic support structure uses an elastic bracket 3 to support the turbine cylinder body 1 on a chassis 2. An adjusting seat 4 is installed on the chassis 2, and an adjusting bolt 5, threaded onto the adjusting seat 4 and abutting the lower end of the elastic bracket 3, is used to adjust the offset of the lower end of the elastic bracket 3 relative to its upper end in the direction of thermal expansion. Before the lower end of the elastic bracket 3 is fixed above the chassis 2, its state is referenced... Figure 2 In state a, at this point, by rotating the adjusting bolt 5, an axial thrust is applied to the lower end of the elastic bracket 3 from its front end, causing the lower end of the elastic bracket 3 to shift relative to its upper end in the thermal expansion direction D of the cylinder body 1. (Refer to...) Figure 2As shown in state b, the position changes from the dashed line to the solid line, causing a pre-deformation on the lower side of the elastic bracket 3 with an offset of L. After adjustment, the lower end of the elastic bracket 3 is fixed to the chassis 2 using bolts 6. When the steam turbine is in use, the cylinder body 1 undergoes thermal expansion due to temperature rise. At this time, the reference... Figure 2 In state c, the cylinder body 1 applies an axial thrust to the upper end of the elastic bracket 3 connected to it, causing the upper end of the elastic bracket 3 to be driven to shift in the thermal expansion direction D. Since the lower end of the elastic bracket 3 has already deformed a certain distance in the thermal expansion direction D, the upper end of the elastic bracket 3 will gradually return to its original position during the shift. Figure 2 The dotted line in state c of the diagram moves to the solid line in the vertical state and can continue to shift a certain distance in the direction of thermal expansion D until the maximum deformation that the elastic support 3 can withstand is reached. Therefore, compared with the prior art, the upper end of the elastic support 3 can shift a greater distance in the direction of thermal expansion relative to the lower end, so that the elastic support 3 can adapt to the cylinder body 1 with a larger amount of thermal expansion change, without exceeding the maximum deformation of the elastic support 3, avoiding damage caused by excessive deformation of the elastic support 3 to one side. That is, the above-mentioned elastic support structure can support the elastic support 3 to be used at higher operating temperatures, effectively improving the safety margin of the above-mentioned support structure in high-temperature and long-shaft-distance units. Its structure is simple, easy to use, and has a wider range of applications.

[0021] As a further improvement to this embodiment, to enhance the supporting capacity of the elastic support 3, a vertical flange 31 can be provided at the upper end of the elastic support 3. The vertical flange 31 has multiple bolt holes and is fixedly connected to the cylinder body 1 by bolts 6, making the connection more stable. A horizontal flange 32 can also be provided at the lower end of the elastic support 3. The horizontal flange 32 is fixedly connected to the chassis 2 by bolts 6, which can further enhance the supporting strength of the elastic support 3 for the turbine unit and better meet the rigid support requirements of the turbine unit. In addition, a pad 7 is provided between the lower end of the elastic support 3 and the chassis 2. The pad 7 is fixed to the chassis 2 by bolts 6, and the horizontal flange 32 at the lower end of the elastic support 3 can be detachably fixed above the pad 7 by bolts 6. By adding the pad 7 at the connection between the elastic support 3 and the chassis 2, the sealing degree of the connection can be improved, and the balance of the lower end of the elastic support 3 can be easily adjusted, ensuring the stable supporting effect of the elastic support 3 while facilitating the assembly of the elastic support 3. When adjusting the offset of the lower end of the elastic support 3, the lower end of the elastic support 3 and the pad 7 can be moved relative to each other by rotating the adjusting bolt 5, so that the elastic support 3 can be pre-deformed.

[0022] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. A steam turbine elastic support structure with thermal compensation, comprising a cylinder body (1), a chassis (2) located below the cylinder body, and an elastic bracket (3) installed between the cylinder body (1) and the chassis (2), wherein the upper and lower ends of the elastic bracket (3) are detachably connected to the cylinder body (1) and the chassis (2) respectively by bolts (6), characterized in that, The chassis (2) is provided with an adjustment seat (4), and an adjustment bolt (5) is threadedly connected to the adjustment seat (4). The adjustment bolt (5) is set along the thermal expansion direction of the cylinder body. The front end of the adjustment bolt (5) abuts against the lower end of the elastic bracket (3). By rotating the adjustment bolt (5), the lower end of the elastic bracket (3) can be pushed to shift relative to the upper end in the thermal expansion direction.

2. The turbine elastic support structure with thermal compensation according to claim 1, characterized in that, The lower end of the elastic support (3) is offset in the direction of thermal expansion by 3-6 mm.

3. The turbine elastic support structure with thermal compensation according to claim 1, characterized in that, The upper end of the elastic bracket (3) is provided with a vertical flange (31), which is fixedly connected to the cylinder body (1) by bolts (6).

4. The turbine elastic support structure with thermal compensation according to claim 1, characterized in that, The lower end of the elastic support (3) is provided with a horizontal flange (32), which is fixedly connected to the chassis (2) by bolts (6).

5. The turbine elastic support structure with thermal compensation according to claim 1, characterized in that, A pad (7) is also provided between the lower end of the elastic bracket (3) and the chassis (2), and the pad (7) is fixed to the chassis (2) by bolts (6).

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