A double flexible support structure for low parameter saturated steam turbine

Abstract

A double flexible support structure for a low-parameter saturated steam turbine. The present invention relates to a support structure for a steam turbine. The present invention aims to solve the problem that the existing steam turbine support structure is prone to jamming of the sliding pin system due to poor lubrication, thereby affecting the safe operation of the steam turbine. The present invention includes a front cylinder, a front bearing box, a cross key, a cat's claw, a front bearing box support plate and a common base. The lower end of the front cylinder is provided with a cat's claw, and the front bearing box is connected to the cat's claw through a cross key. The lower end of the cross key is provided with a front bearing box support plate. The double flexible support structure for a low-parameter saturated steam turbine also includes a double flexible plate assembly, and the double flexible plate assembly is fixedly mounted between the lower surface of the front bearing box support plate and the upper surface of the common base. The present invention is used in the field of steam turbine technology, and the present invention improves the safety, reliability and maintainability of the steam turbine as a whole.

Description

Technical Field

[0001] The invention relates to a steam turbine support structure, in particular to a double flexible support structure of a low-parameter saturated steam turbine, belonging to the technical field of steam turbines. Background Art

[0002] Steam turbine support structures are mostly pin systems. The operation of the pin system requires lubricating oil on the sliding surface. Regular injection of lubricating oil increases the inspection and maintenance work of the steam turbine. Poor lubrication can also cause the pin system to get stuck, making it impossible to absorb the expansion of the steam turbine, which in turn affects the safe operation of the steam turbine. Some steam turbines also use a single flexible support structure. The force of a single flexible plate is weak, which can easily cause the eccentricity between the dynamic and static parts of the steam turbine to increase, leading to problems such as rotor vibration. Summary of the invention

[0003] The present invention aims to solve the problem that poor lubrication of the existing steam turbine support structure easily leads to the jamming of the sliding pin system, thereby affecting the safe operation of the turbine, and further provides a low-parameter saturated steam turbine double flexible support structure.

[0004] The technical solution adopted by the present invention to solve the above problems is:

[0005] The present invention includes a front cylinder, a front bearing box, a transverse key, a cat's claw, a front bearing box support plate and a common base. The lower end of the front cylinder is provided with a cat's claw, and the front bearing box is connected to the cat's claw through a transverse key. The lower end of the transverse key is provided with a front bearing box support plate. The low-parameter saturated steam turbine double flexible support structure also includes a double flexible plate assembly, and the double flexible plate assembly is fixedly installed between the lower surface of the front bearing box support plate and the upper surface of the common base.

[0006] Furthermore, the dual flexible plate assembly includes two flexible plates, an upper connecting plate and a lower connecting plate. The two flexible plates are arranged side by side and in parallel. The upper ends of the two flexible plates are fixedly connected to the lower surface of the upper connecting plate, and the lower ends of the two flexible plates are fixedly connected to the lower connecting plate.

[0007] Furthermore, the two flexible plates, the upper connecting plate and the lower connecting plate are integrally formed.

[0008] Furthermore, each flexible plate is a "concave"-shaped plate.

[0009] Furthermore, the double flexible support structure of a low-parameter saturated steam turbine also includes a first bolt, a first nut, a second bolt, a second nut and a gasket, and the upper connecting plate is fixedly connected to the front bearing box support plate by the first bolt and the first nut; the lower connecting plate is fixedly connected to the common base by the second bolt, the second nut and the gasket.

[0010] The beneficial effects of the present invention are:

[0011] 1. In view of the small expansion of low-parameter saturated steam turbines, the deformation of the flexible plate is used to compensate for the thermal expansion of the steam turbine. Its supporting surface is in close contact without gaps, and no lateral and vertical displacement will occur;

[0012] 2. The double flexible plate structure of the present invention replaces the traditional sliding pin system, eliminating the risk of jamming. In addition, the flexible plate does not need to add lubricating oil, reducing the inspection and maintenance work;

[0013] 3. The double flexible plate structure is adopted, and the flexible plate is evenly stressed, eliminating the problem of excessive vibration caused by the non-concentricity of the moving and static parts caused by a single flexible plate;

[0014] 4. The present invention improves the safety, reliability and maintainability of the steam turbine as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the structure of a double flexible plate;

[0017] Figure 3 It is a schematic diagram of the positions of the double flexible plate in the cold and hot states.

[0018] In the figure:

[0019] 1-front cylinder; 2-front bearing box; 3-cross key; 4-cat claw; 5-front bearing box support plate; 6-common base; 7-

[0020] Flexible plate; 8-upper connecting plate; 9-lower connecting plate; 10-first bolt; 11-first nut; 12-second bolt; 13-second nut; 14-pad; 15-second bolt; 16-second nut; 17-tail direction; 18-nose direction; 19-flexible plate cold position; 20-flexible plate hot position. DETAILED DESCRIPTION

[0021] Specific implementation method 1: Combination Figures 1 to 3 The present embodiment is described. The present embodiment describes a double flexible support structure of a low-parameter saturated steam turbine, which includes a front cylinder 1, a front bearing box 2, a horizontal key 3, a cat claw 4, a front bearing box support plate 5 and a common base 6. The lower end of the front cylinder 1 is provided with a cat claw 4, the front bearing box 2 is connected to the cat claw 4 through the horizontal key 3, and the lower end of the horizontal key 3 is provided with a front bearing box support plate 5. The double flexible support structure of the low-parameter saturated steam turbine also includes a double flexible plate assembly, and the double flexible plate assembly is fixedly installed between the lower surface of the front bearing box support plate 5 and the upper surface of the common base 6.

[0022] The horizontal key 3 is clamped with the cat claw 4, and the horizontal key 3 is clamped with the front bearing box 2. The second bolt 15 and the second nut 16 are used to fix the horizontal key 3, the cat claw 4 and the front bearing box support plate 5 together.

[0023] The rear part of the low-parameter saturated steam turbine (i.e., 17 in the tail direction) is the dead point. When it expands due to heat, the front cylinder 1 generates an axial thrust to the front bearing box 2 and the upper part of the double flexible plate 7 in the direction of the head 18 through the cat claw 4 and the cross key 3. The double flexible component is fixed on the base 6, so a bending moment is generated relative to the bottom of the double flexible plate 7, forcing the double flexible plate 7 to deform. The deformation needs to be determined by calculation within the range of elastic deformation. In this way, when the steam turbine is shut down and cooled, the double flexible plate returns to the state before expansion to achieve reciprocating operation.

[0024] Specific implementation method 2: Combination Figure 1 to Figure 2 To illustrate this embodiment, the dual flexible plate assembly described in this embodiment includes two flexible plates 7, an upper connecting plate 8 and a lower connecting plate 9. The two flexible plates 7 are arranged side by side and in parallel. The upper ends of the two flexible plates 7 are fixedly connected to the lower surface of the upper connecting plate 8, and the lower ends of the two flexible plates 7 are fixedly connected to the lower connecting plate 9.

[0025] The double flexible plate assembly is in the shape of "Ⅱ" and adopts a double flexible plate structure. The flexible plate is evenly stressed, eliminating problems such as excessive vibration caused by the eccentricity of the moving and static parts caused by a single flexible plate.

[0026] The other components and connection relationships are the same as those of the first embodiment.

[0027] Specific implementation method three: Combination Figures 1 to 3 The present embodiment is described. In the present embodiment, the two flexible plates 7 , the upper connecting plate 8 and the lower connecting plate 9 are integrally formed.

[0028] The other components and connection relationships are the same as those in the first or second specific implementation mode.

[0029] Specific implementation method four: Combination Figures 1 to 3 The flexible plate 7 of this embodiment is a "concave" shaped plate. The "concave" shaped plate has the characteristics of low rigidity and high flexibility at the upper end, which is conducive to absorbing the expansion of the steam turbine, and high rigidity and low flexibility at the lower end, which is conducive to providing support.

[0030] The other components and connection relationships are the same as those of the first, second or third specific implementation modes.

[0031] Specific implementation method five: Combination Figures 1 to 3To illustrate this embodiment, the double flexible support structure of a low-parameter saturated steam turbine described in this embodiment also includes a first bolt 10, a first nut 11, a second bolt 12, a second nut 13 and a pad 14. The upper connecting plate 8 is fixedly connected to the front bearing box support plate 5 by the first bolt 10 and the first nut 11; the lower connecting plate 9 is fixedly connected to the common base 6 by the second bolt 12, the second nut 13 and the pad 14.

[0032] The other components and connection relationships are the same as those of the first, second, third or fourth specific implementation modes.

[0033] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement made to the above embodiments without departing from the content of the technical solution of the present invention, based on the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A double flexible support structure of a low-parameter saturated steam turbine, comprising a front cylinder (1), a front bearing box (2), a cross key (3), a cat's claw (4), a front bearing box support plate (5) and a common base (6), wherein the lower end of the front cylinder (1) is provided with a cat's claw (4), the front bearing box (2) is connected to the cat's claw (4) via a cross key (3), and the lower end of the cross key (3) is provided with a front bearing box support plate (5), characterized in that: The low-parameter saturation steam turbine double flexible support structure also includes a double flexible plate assembly, wherein the double flexible plate assembly is fixedly installed between the lower surface of the front bearing box support plate (5) and the upper surface of the common base (6); The double flexible plate assembly comprises two flexible plates (7), an upper connecting plate (8) and a lower connecting plate (9); the two flexible plates (7) are arranged side by side and in parallel; the upper ends of the two flexible plates (7) are fixedly connected to the lower surface of the upper connecting plate (8); and the lower ends of the two flexible plates (7) are fixedly connected to the lower connecting plate (9); The two flexible plates (7), the upper connecting plate (8) and the lower connecting plate (9) are integrally formed; Each flexible plate (7) is a "concave"-shaped plate body; The double flexible plate assembly is in the shape of a letter II.

2. The double flexible support structure of a low parameter saturation steam turbine according to claim 1, characterized in that: The double flexible support structure of a low-parameter saturated steam turbine further comprises a first bolt (10), a first nut (11), a second bolt (12), a second nut (13) and a cushion block (14); the upper connecting plate (8) is fixedly connected to the front bearing box support plate (5) via the first bolt (10) and the first nut (11); and the lower connecting plate (9) is fixedly connected to the common base (6) via the second bolt (12), the second nut (13) and the cushion block (14).

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