A turbine cylinder dog presser

Abstract

The steam turbine cylinder pawl pressing device is characterized in that: a connecting bolt is used to connect a pressing block, a disc spring set, an adjusting gasket I, an adjusting gasket II, a special nut, a cylinder pawl and a bearing box, so that a downward load is applied to the cylinder pawl without affecting the relative sliding of the cylinder pawl and the bearing box, the safety margin of the cylinder stability is further improved, and the cylinder pawl floating is avoided.

Description

Technical Field

[0001] This invention relates to the field of steam turbine technology, and in particular to a steam turbine cylinder cat claw clamping device. Background Technology

[0002] Under normal operating conditions, to ensure the stability of the turbine cylinders during turbine unit operation, it is necessary to check the cylinder stability to prevent the cylinder's "cat's paws" from floating upwards. Simultaneously, to cope with the potential upward movement of the "cat's paws" under extreme operating conditions, conventional "cat's paw" limiting devices are often used, such as... Figure 1 As shown, the upward movement of the paw is limited. Conventional paw limiting devices often leave a small gap t between the limiting nut or limiting block and the cylinder paw to allow for relative sliding between the cylinder paw and the bearing housing. However, conventional paw limiting devices can only limit the upward movement of the paw and cannot prevent the paw from rising in advance.

[0003] Meanwhile, for some units, due to the light weight of the cylinder module, the pipeline stress and turbine power torsional reaction force are relatively large, the safety margin of cylinder stability is low, and the risk of the cylinder claw floating is relatively high. It is necessary to take measures to further increase the downward load at the claw to improve the stability of the cylinder and avoid the claw floating.

[0004] Therefore, it is necessary to design a newer turbine cylinder cat's claw device that can apply a downward load to the cat's claw through a disc spring without affecting the relative sliding between the cylinder cat's claw and the bearing housing. This would compensate for the insufficient downward load of the cat's claw caused by the light weight of the cylinder module, further improve the safety margin of cylinder stability, and prevent the cat's claw from floating. Summary of the Invention

[0005] To address the problems and defects exhibited by conventional cat's paw restraint devices, this invention provides a steam turbine cylinder cat's paw clamping device. The purpose is to further improve the stability of the cylinder, prevent the cylinder cat's paw from floating up, and thus improve the overall reliability of the steam turbine operation.

[0006] To achieve the objective of this invention, the technical solution adopted is as follows: A turbine cylinder cat's claw clamping device includes a connecting bolt 1, a pressure block 2, a disc spring assembly 3, an adjusting shim I 4, an adjusting shim II 5, and a special nut 6.

[0007] The cylinder claw clamping device is connected to the cylinder claw 102 and the bearing housing 101. The cylinder claw 102 is located between the bearing housing 101 and the cylinder claw clamping device. One end of the connecting bolt 1 is fixed to the bearing housing 101, and the other end passes through the through hole of the cylinder claw 102 and is connected to the claw clamping device on the other side of the cylinder claw 102.

[0008] Among them, the pressure block 2 is first placed on the upper surface of the cylinder claw 102, and the disc spring assembly 3 is then placed on the upper platform 203 of the pressure block 2. The adjusting shim I 4 is placed above the disc spring assembly 3. The special nut 6 is installed on the upper end of the connecting bolt 1 that passes through the through hole of the cylinder claw 102. The adjusting shim II 5 is installed between the top of the connecting bolt 1 and the special nut 6.

[0009] The adjusting shim I4 and the disc spring assembly 3 are installed in the upper cavity 601 of the groove inside the special nut 6. The disc spring assembly 3 applies a load to the pressure block 2, which is then transmitted to the cylinder claw 102, applying a downward load to the cylinder claw 102. The stiffness of the disc spring is changed by adjusting the selection of the disc spring, the total stiffness of the disc spring assembly 3 is changed by adjusting the number of stacked disc springs, and the deformation of the disc spring assembly 3 is changed by changing the thickness of the adjusting shim I4. The combination of these three methods can adjust the total load of the spring assembly 3 to the required range.

[0010] The boss 201 on the top of the pressure block 2 is placed in the lower cavity 602 of the groove inside the special nut 6, thereby limiting the pressure block 2 in the horizontal direction.

[0011] Preferably, the disc spring assembly 3 is one or more of alloy spring steel, stainless steel, and high-temperature alloy.

[0012] Among them, 50CrVA is preferred for alloy spring steel; 301 stainless steel is preferred for stainless steel; and Inconel 718 is preferred for high-temperature alloy.

[0013] Among them, the disc spring assembly 3 is preferably stacked.

[0014] Preferably, there is a reserved gap t between the special nut 6 and the stepped surface 202 of the pressure block 2, and a reserved gap j between the special nut 6 and the upper platform surface 203 of the pressure block 2.

[0015] Preferably, the thickness of the shim II5 is adjusted to adjust the width of the reserved gap t. That is, by adjusting the thickness of the shim II5, it can be ensured that when the special nut 6 is tightened, the reserved gap t between the special nut 6 and the step surface 202 of the pressure block 2, and the reserved gap j between the special nut 6 and the upper platform surface 203 of the pressure block 2 are greater than the reserved gap t.

[0016] Due to the existence of the reserved gaps t and j, the relative horizontal displacement between the pressure block 2 and the cylinder claw 102 will not hinder the relative horizontal movement between the cylinder claw 102 and the claw pressing device and the bearing box 101, and therefore will not affect the thermal expansion of the cylinder claw 102.

[0017] The above technical solution has the following beneficial effects: In this cylinder cat's paw clamping device, a butterfly spring is used to apply a downward load to the cat's paw. The magnitude of this load can be adjusted by selecting the butterfly spring and adjusting the shims above the butterfly spring, thereby further increasing the downward load of the cylinder cat's paw, improving the safety margin of cylinder stability, and preventing the cat's paw from floating upward. Attached Figure Description

[0018] Figure 1 A schematic diagram of a conventional cat paw restraint device in the prior art; Figure 2 A schematic diagram showing the connection structure between the cylinder claw clamping device, the cylinder claw, and the bearing housing; Figure 3 A schematic diagram of the cylinder cat's claw clamping device; Figure 4 A top view schematic diagram of the cylinder cat's claw clamping device structure; Figure 5 This is a schematic diagram of the three-dimensional structure of the compression block; Figure 6 This is a schematic diagram of the cross-section of the compact; Figure 7 A schematic diagram of the three-dimensional structure of a specially designed nut; Figure 8 This is a schematic diagram of the cross-section of a specially made nut; Among them, there are connecting bolt 1, pressure block 2, disc spring assembly 3, adjusting shim I 4, adjusting shim II 5, special nut 6, bearing box 101, cylinder claw 102, upper cavity of groove 601, lower cavity of groove 602, boss 201, step surface 202, and upper platform surface 203. Detailed Implementation

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] Example 1 A turbine cylinder claw clamping device, comprising a connecting bolt 1, a pressure block 2, a disc spring assembly 3, adjusting shims I 4, adjusting shims II 5, and a special nut 6. Figure 2 As shown, the cylinder claw clamping device B is connected to the cylinder claw 102 and the bearing housing 101. The cylinder claw 102 is located between the bearing housing 101 and the cylinder claw clamping device B. One end of the connecting bolt 1 is fixed to the bearing housing 101, and the other end passes through the through hole of the cylinder claw 102 and is connected to the pressure block 2, disc spring group 3, adjusting shim I 4, adjusting shim II 5, and special nut 6 of the claw clamping device B on the other side of the cylinder claw 102.

[0021] In this embodiment, as Figure 4As shown, a special nut 6 is installed on the upper end of the connecting bolt 1. An adjusting shim II 5 is installed between the top of the connecting bolt 1 and the special nut 6. The thickness of the adjusting shim II 5 is 10mm, so that when the special nut 6 is tightened, the reserved gap t between the special nut 6 and the step surface 202 of the pressure block 2 is 0.15~0.18mm, and the reserved gap j between the special nut 6 and the upper platform surface 203 of the pressure block 2 is 3mm. At this time, the reserved gap j > the reserved gap t.

[0022] Adjusting shim I4 and disc spring assembly 3 are installed in the groove inside the special nut 6, and apply a load to the pressure block 2 through the disc spring assembly 3. This load is transmitted to the cylinder claw 102 through the pressure block 2, applying a downward load to the cylinder claw 102.

[0023] In this embodiment, the disc spring assembly is made of 50CrVA material; it is stacked in a layered manner, with a total of 9 stacks; the thickness of the adjusting shim I4 is 8.6mm. Through the combination of the above three methods, the total load of the disc spring assembly 3 is adjusted to 45KN, and the support reaction force at the cat paw support is adjusted from -163.2KN to -118.2KN. This support reaction force meets the requirements for cylinder stability.

[0024] The boss 201 on top of the pressure block 2 is installed in the groove below the special nut 6, thereby limiting the pressure block 2 in the horizontal direction. At the same time, due to the existence of the reserved gaps t and j, the pressure block 2 and the cylinder claw 102 can undergo horizontal relative displacement, which will not hinder the horizontal relative operation between the cylinder claw 102, the claw clamping device B, and the bearing housing 101, and therefore will not affect the thermal expansion of the cylinder claw 102.

[0025] As can be seen from this embodiment, the present invention, through the setting of the cylinder claw clamping device, can apply a downward load to the cylinder claw without affecting the relative sliding between the cylinder claw and the bearing housing, thereby further improving the safety margin of cylinder stability and preventing the cylinder claw from floating.

[0026] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A cat's claw clamping device for a steam turbine cylinder, characterized in that: Includes connecting bolts (1), pressure block (2), disc spring assembly (3), adjusting shim I (4), adjusting shim II (5), and special nut (6); One end of the connecting bolt (1) is fixed to the bearing housing (101), and the other end passes through the through hole of the cylinder claw (102) and is connected to the pressure block (2), the disc spring assembly (3), the adjusting shim I (4), the adjusting shim II (5), and the special nut (6); First, a pressure block (2) is placed on the upper surface of the cylinder claw (102). A disc spring assembly (3) is placed on the upper platform (203) of the pressure block (2). An adjusting shim I (4) is placed above the disc spring assembly (3). A special nut (6) is installed on the upper end of the connecting bolt (1) that passes through the through hole of the cylinder claw (102). The adjusting shim II (5) is installed between the top of the connecting bolt (1) and the special nut (6). The adjusting shim I (4) and the disc spring assembly (3) are installed in the upper cavity (601) of the groove inside the special nut (6). The boss (201) above the pressure block (2) is placed in the lower cavity (602) of the groove inside the special nut (6). The thickness of the adjusting shim I (4) adjusts the deformation of the disc spring assembly (3); The special nut (6) and the stepped surface (202) of the pressure block (2) are reserved with a gap t, and the special nut (6) and the upper platform surface (203) of the pressure block (2) are reserved with a gap j; The thickness of the adjusting shim II (5) is adjusted by reserving a gap t. The reserved gap j is greater than the reserved gap t.

2. The steam turbine cylinder cat's claw clamping device according to claim 1, characterized in that: The disc spring assembly (3) is made of alloy spring steel.

3. The steam turbine cylinder cat's claw clamping device according to claim 2, characterized in that: The alloy spring steel is 50CrVA.

4. The steam turbine cylinder cat's claw clamping device according to claim 1, characterized in that: The disc spring assembly (3) is stacked.

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