High-lift gate valve stem rotation stopping device, high-lift gate structure and steam turbine

Abstract

The present disclosure relates to a high-gear door valve rod rotation-stopping device, a high-gear door structure and a steam turbine, wherein the high-gear door valve rod rotation-stopping device comprises a high-gear door shell, a shaft sleeve, a linear variable differential transformer and a rotation-preventing rod, the high-gear door shell is provided with a first hole and a second hole, the shaft sleeve is located in the high-gear door shell and connected with a valve rod installed in the high-gear door shell, the shaft sleeve is used for synchronous action with the valve rod, one end of the linear variable differential transformer is connected with the shaft sleeve and the other end is located in the first hole, one end of the rotation-preventing rod is connected with the shaft sleeve and the other end is located in the second hole. The present disclosure sets the rotation-preventing rod, so that the rotation-preventing rod completely bears the force of the linear variable differential transformer during the movement of the high-gear door, effectively protects the linear variable differential transformer and realizes bidirectional redundant protection.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of steam turbine governing system, in particular, to a high governing valve rod rotation stopping device, a high governing valve structure and a steam turbine. BACKGROUND

[0002] Currently, in the field of steam turbine governing system, the valve rod rotation and the governing valve shaking may occur due to the air flow excitation force or the oil driver fluctuation when the high governing valve is running. The linear variable differential transformer (LVDT) connecting rod is prone to thread fracture when running in such a working condition for a long time. Moreover, the design gap between the linear variable differential transformer (LVDT) connecting rod and its guard plate is too large. When the valve rod rotates by a large angle during operation, the linear variable differential transformer (LVDT) core is prone to dislocation fracture. Once the sensor signal cannot be normally output or the output signal is suddenly changed, the high governing valve will lose control, which seriously threatens the safe operation of the unit. SUMMARY

[0003] The purpose of the present disclosure is to provide a high governing valve rod rotation stopping device, a high governing valve structure and a steam turbine. The anti-rotation rod is arranged to bear the force of the linear variable differential transformer when the high governing valve is moving, thereby effectively protecting the linear variable differential transformer and realizing bidirectional redundant protection.

[0004] In order to achieve the above purpose, the present disclosure provides a high governing valve rod rotation stopping device, which comprises a high governing valve shell, a shaft sleeve, a linear variable differential transformer and an anti-rotation rod. The high governing valve shell is formed with a first hole and a second hole. The shaft sleeve is located in the high governing valve shell and connected with a valve rod installed in the high governing valve shell. The shaft sleeve is used to move synchronously with the valve rod. One end of the linear variable differential transformer is connected with the shaft sleeve, and the other end is located in the first hole. One end of the anti-rotation rod is connected with the shaft sleeve, and the other end is located in the second hole.

[0005] Optionally, the high governing valve shell comprises a shell body, which is a hollow columnar structure. A plurality of through holes are arranged on the shell body in a circumferential direction and communicate with the inside of the shell body. The length direction of the through hole extends along the axial direction of the shell body.

[0006] Optionally, the high-tuning door shell further comprises a guard plate and a pin shaft, the second hole is located on the guard plate, each of the two opposite edges of the length direction of the through hole is provided with a first pin shaft sleeve and a second pin shaft sleeve, the first pin shaft sleeve and the second pin shaft sleeve are coaxial and spaced, the two opposite side edges of the guard plate are respectively provided with a lug shaft sleeve, the two lug shaft sleeves are respectively located between the first pin shaft sleeve and the second pin shaft sleeve of the two opposite edges of the through hole, and the pin shaft is sequentially arranged in the first pin shaft sleeve, the lug shaft sleeve and the second pin shaft sleeve.

[0007] Optionally, the pin shaft is in an L-shaped structure.

[0008] Optionally, a gap is arranged between the linear variable differential transformer and the first hole, a gap is arranged between the anti-rotation rod and the second hole, and the gap between the anti-rotation rod and the second hole is smaller than the gap between the linear variable differential transformer and the first hole.

[0009] Optionally, the length direction of the first hole and the length direction of the second hole both extend along the axial direction of the high-tuning door shell, the linear variable differential transformer is used to move along the length direction of the first hole under the driving of the valve rod, and the anti-rotation rod is used to move along the length direction of the second hole under the driving of the valve rod.

[0010] Optionally, the anti-rotation rod is entirely or partially in a square cross section.

[0011] The present disclosure provides a high-tuning door structure, comprising an oil driver and the high-tuning door valve rod rotation-stopping device, the oil driver is connected with the valve rod, a part of the valve rod penetrates through and extends into the high-tuning door shell, and the oil driver is used to drive the valve rod to act by adjusting the oil inlet amount.

[0012] Optionally, the high-tuning door structure further comprises an elastic assembly, the elastic assembly is located in the high-tuning door shell, one end of the elastic assembly is connected with the high-tuning door shell, the other end is connected with the shaft sleeve, and the shaft sleeve is connected with the valve rod connected with the oil driver.

[0013] The present disclosure provides a steam turbine, comprising the high-tuning door structure.

[0014] Through the above technical solution, the high-tuning door valve rod rotation-stopping device of the present disclosure adds an anti-rotation rod, so that the anti-rotation rod completely bears the stress of the linear variable differential transformer during the activity of the high-tuning door, effectively protects the linear variable differential transformer, and realizes bidirectional redundant protection.

[0015] Other features and advantages of the present disclosure will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of the specification. The drawings illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure. In the drawings:

[0017] Figure 1 is a schematic view of the internal structure of a high-tune door valve rod anti-rotation device according to an exemplary embodiment of the present disclosure;

[0018] Figure 2 is a schematic view of the structure of a high-tune door valve rod anti-rotation device according to an exemplary embodiment of the present disclosure;

[0019] Figure 3 is a front view of the relationship between the guard plate and the anti-rotation rod according to an exemplary embodiment of the present disclosure;

[0020] Figure 4 is a top view of the relationship between the guard plate and the anti-rotation rod according to an exemplary embodiment of the present disclosure;

[0021] Figure 5 is a front view of the guard plate according to an exemplary embodiment of the present disclosure;

[0022] Figure 6 is a top view of the guard plate according to an exemplary embodiment of the present disclosure;

[0023] Figure 7 is a front view of the anti-rotation rod according to an exemplary embodiment of the present disclosure;

[0024] Figure 8 is a side view of the anti-rotation rod according to an exemplary embodiment of the present disclosure;

[0025] Figure 9 is a schematic view of the structure of a pin shaft according to an exemplary embodiment of the present disclosure.

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 1 - high-tune door housing; 11 - housing body; 12 - through hole; 13 - guard plate; 14 - pin shaft; 15 - first pin shaft sleeve; 16 - second pin shaft sleeve; 17 - ear shaft sleeve;

[0028] 2 - first hole;

[0029] 3 - second hole;

[0030] 4 - shaft sleeve;

[0031] 5 - valve rod;

[0032] 6 - linear variable differential transformer;

[0033] 7-anti-rotation rod;

[0034] 8-elastic assembly. DETAILED DESCRIPTION

[0035] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0036] In the present disclosure, unless otherwise stated, the orientation words such as "up, down, left, right" are generally defined as the direction of the drawing surface, and "inner, outer" refers to the inner and outer of the relevant parts. In addition, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present disclosure, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0038] As shown in Figures 1 to 9 According to the first aspect of the present disclosure, a high regulating door valve rod anti-rotation device is provided, which comprises a high regulating door shell 1, a shaft sleeve 4, a linear variable differential transformer 6 and an anti-rotation rod 7. The first hole 2 and the second hole 3 are formed on the high regulating door shell 1. The shaft sleeve 4 is located in the high regulating door shell 1 and is connected with the valve rod 5 installed in the high regulating door shell 1. The shaft sleeve 4 is used to move synchronously with the valve rod 5. One end of the linear variable differential transformer 6 is connected with the shaft sleeve 4, and the other end is located in the first hole 2. One end of the anti-rotation rod 7 is connected with the shaft sleeve 4, and the other end is located in the second hole 3.

[0039] Among them, the valve rod 5 can drive the shaft sleeve 4 to move in the high regulating door shell 1 when the high regulating door operates, and in turn drive the linear variable differential transformer 6 and the anti-rotation rod 7 connected with the shaft sleeve 4 to move. In order to ensure that the movement of the linear variable differential transformer 6 and the anti-rotation rod 7 is not interfered, the length direction of the first hole 2 and the length direction of the second hole 3 are the same as the movement direction of the valve rod 5, that is, the linear variable differential transformer 6 can move along the length direction of the first hole 2, and the anti-rotation rod 7 can move along the length direction of the second hole 3.

[0040] The valve rod 5 rotates due to the air flow exciting force or the oil motor fluctuation during the operation of the high pitch door, that is, the valve rod 5 rotates relatively during the movement. In the related art, the rotation of the valve rod of the high pitch door is usually realized by a linear variable differential transformer 6 (LVDT). The linear variable differential transformer 6 is used to feed back the displacement of the oil motor piston of the high pitch door. However, if the rotation angle of the valve rod 5 is too large during the operation, the linear variable differential transformer 6 core is prone to dislocation and fracture. Once the sensor signal cannot be normally output or the output signal is suddenly changed, the high pitch door will lose control, which seriously threatens the safe operation of the unit. In the high pitch door valve rod rotation stopping device in the above disclosure, the anti-rotation rod 7 is additionally arranged, so that the anti-rotation rod 7 completely bears the force of the linear variable differential transformer 6 during the movement of the high pitch door, the linear variable differential transformer 6 is effectively protected, bidirectional redundant protection is realized, and the reliability and safety benefit of the unit are improved.

[0041] Optionally, the angle relationship between the linear variable differential transformer 6 and the anti-rotation rod 7 in the disclosure can be various, which is not limited in the disclosure. As an exemplary embodiment of the disclosure, the angle between the linear variable differential transformer 6 and the anti-rotation rod 7 is 180°.

[0042] In an exemplary embodiment of the disclosure, the first hole 2 and the second hole 3 are both strip-shaped holes, and the lengths of the first hole 2 and the second hole 3 are greater than the stroke distance of the valve rod 5, so as to ensure that the linear variable differential transformer 6 and the anti-rotation rod 7 can move freely with the valve rod 5.

[0043] In an exemplary embodiment of the disclosure, the linear variable differential transformer 6 is a rod-shaped structure.

[0044] Optionally, the high pitch door shell 1 comprises a shell body 11, the shell body 11 is a hollow columnar structure, a plurality of through holes 12 are arranged on the shell body 11 and spaced apart in the circumferential direction, and the through holes 12 are in communication with the inside of the shell body 11. The length direction of the through hole 12 extends along the axial direction of the shell body 11.

[0045] The length direction of the through hole 12 is the same as the length direction of the first hole 2 and the length direction of the second hole 3.

[0046] Through the above technical solution, the through hole 12 is arranged, the internal structure of the shell body 11 can be directly observed, and problems can be easily found and repaired.

[0047] In an exemplary embodiment of the disclosure, the number of through holes 12 is three, and the three through holes 12 are arranged equidistantly along the circumferential direction of the shell body 11.

[0048] In an exemplary embodiment of the disclosure, the through hole 12 is a rectangular hole.

[0049] Optionally, the high-tune door shell 1 further comprises a guard plate 13 and a pin shaft 14, the second hole 3 is located on the guard plate 13, the first pin shaft sleeve 15 and the second pin shaft sleeve 16 are arranged at each of the two opposite edges of the length direction of the through hole 12, the first pin shaft sleeve 15 and the second pin shaft sleeve 16 are coaxial and spaced, the guard plate 13 is provided with a lug shaft sleeve 17 at each of the two opposite sides, the two lug shaft sleeves 17 are respectively located between the first pin shaft sleeve 15 and the second pin shaft sleeve 16 at the two opposite edges of the through hole 12, and the pin shaft 14 is sequentially arranged in the first pin shaft sleeve 15, the lug shaft sleeve 17 and the second pin shaft sleeve 16.

[0050] In the high-tune door valve rod rotation-stopping device of the present disclosure, the guard plate 13 is connected with the shell body 11 by the pin shaft 14, the guard plate can be freely disassembled and installed by disassembling and assembling the pin shaft 14, which brings great convenience to maintenance, and the guard plate 13 is installed by using the original space of the through hole 12, so that the space utilization rate is high and the structure of the high-tune door shell 1 can be ensured to be changed as little as possible.

[0051] In an exemplary embodiment of the present disclosure, the gap between the first pin shaft sleeve 15, the second pin shaft sleeve 16 and the lug shaft sleeve 17 is not greater than 0.1 mm, which can prevent vibration during movement caused by too large gap under the condition of ensuring smooth disassembly and assembly.

[0052] In an exemplary embodiment of the present disclosure, the guard plate 13 is made of carbon steel, which can ensure the reliability and safety of the rotation-preventing rod 7 during movement.

[0053] Optionally, the pin shaft 14 is in L-shaped structure.

[0054] Through the above technical solution, the bending part of the pin shaft 14 can be used to facilitate the installation or removal of the pin shaft 14, and the pin shaft 14 can also be prevented from falling off.

[0055] In an exemplary embodiment of the present disclosure, the gap between the pin shaft 14 and the first pin shaft sleeve 15, the lug shaft sleeve 17 and the second pin shaft sleeve 16 is not greater than 0.1 mm, which can prevent vibration during movement caused by too large gap under the condition of ensuring smooth disassembly and assembly.

[0056] Optionally, the gap is arranged between the linear variable differential transformer 6 and the first hole 2, and the gap is arranged between the rotation-preventing rod 7 and the second hole 3, and the gap between the rotation-preventing rod 7 and the second hole 3 is smaller than the gap between the linear variable differential transformer 6 and the first hole 2.

[0057] According to the technical scheme, the radial gap between the anti-rotation rod 7 and the second hole 3 is smaller than the radial gap between the linear variable differential transformer 6 and the first hole 2, that is, the gap in the width direction of the anti-rotation rod 7 and the second hole 3 is smaller than the gap in the width direction of the linear variable differential transformer 6 and the first hole 2, so that the horizontal swing range of the anti-rotation rod 7 is smaller than the horizontal swing range of the linear variable differential transformer 6, thereby enabling the anti-rotation rod 7 to completely bear the force of the linear variable differential transformer 6 when the valve rod 5 rotates, and the linear variable differential transformer 6 is not subjected to force, and the protection of the linear variable differential transformer 6 is realized.

[0058] Optionally, the length direction of the first hole 2 and the length direction of the second hole 3 both extend along the axial direction of the high-tune door shell 1, and the linear variable differential transformer 6 is configured to move along the length direction of the first hole 2 under the driving of the valve rod 5, and the anti-rotation rod 7 is configured to move along the length direction of the second hole 3 under the driving of the valve rod 5.

[0059] According to the technical scheme, the length direction of the first hole 2 and the length direction of the second hole 3 are both the same as the moving direction of the valve rod 5, and in the moving process of the valve rod 5, the valve rod 5 can drive the linear variable differential transformer 6 to move along the length direction of the first hole 2, and drive the anti-rotation rod 7 to move along the length direction of the second hole 3, thereby ensuring that the first hole 2 and the second hole 3 do not interfere with the movement of the linear variable differential transformer 6 and the anti-rotation rod 7.

[0060] Optionally, the cross section of the anti-rotation rod 7 is square.

[0061] According to the technical scheme, it is convenient to use special tools to screw in or out the anti-rotation rod 7.

[0062] In an exemplary embodiment of the present disclosure, the anti-rotation rod 7 is connected with the valve rod 5 through threads, which facilitates the installation and removal of the anti-rotation rod 7, and a fastening nut is arranged to lock and prevent loosening and falling due to vibration.

[0063] In an exemplary embodiment of the present disclosure, the anti-rotation rod 7 is made of 2Cr12NiMoWV (C422) material, which has reasonable chemical composition design, good normal and high temperature mechanical properties, small notch sensitivity, and good shock absorption and anti-relaxation performance.

[0064] The high-tune door valve rod rotation preventing device of the present disclosure can effectively protect the linear variable differential transformer 6 by adding the anti-rotation rod 7 to bear the force of the linear variable differential transformer 6, eliminate the risk of fracture of the connecting threads due to the excessive rotation angle of the linear variable differential transformer 6, eliminate the risk of high-tune door out of control without changing the linear variable differential transformer 6, greatly ensure the safety, improve the reliability and safety benefits of the unit, and the anti-rotation rod 7 and the guard plate 13 can be freely disassembled, which greatly facilitates the installation and maintenance.

[0065] According to a second aspect of the present disclosure, a high trim structure is provided, comprising an oil motor and the high trim valve rod rotation stopping device described above, the oil motor being connected with the valve rod 5, a part of the valve rod 5 penetrating into the high trim housing 1, the oil motor being used to drive the valve rod 5 to act by adjusting the oil inlet amount.

[0066] Through the technical solution described above, different oil inlet amounts of the oil motor result in different displacements of the piston in the oil motor, and further result in different moving distances of the valve rod 5 connected with the oil motor. The present disclosure feeds back the displacement of the piston of the high trim oil motor through the linear variable differential transformer 6.

[0067] Optionally, the high trim structure further comprises an elastic assembly 8, the elastic assembly 8 being located in the high trim housing 1, one end of the elastic assembly 8 being connected with the high trim housing 1, and the other end of the elastic assembly 8 being connected with the shaft sleeve 4, the shaft sleeve 4 being connected with the valve rod 5 connected with the oil motor.

[0068] Through the technical solution described above, the elastic assembly 8 is used to realize the movable connection between the valve rod 5 and the high trim housing 1.

[0069] In an exemplary embodiment of the present disclosure, the inside of the high trim housing 1 is provided with a spring connected with the high trim housing 1 at one end, the other end of the spring being connected with a spring seat, one end of the shaft sleeve 4 being connected with the spring seat, the other end of the shaft sleeve 4 being connected with the valve rod 5 penetrating into the high trim housing 1, three protruding structures being formed on the spring seat in equal intervals along the circumference, each of the protruding structures being located in the through hole 12, and the protruding structures being able to move along the length direction of the through hole 12 under the driving of the valve rod 5.

[0070] According to a third aspect of the present disclosure, a steam turbine is provided, comprising the high trim structure described above.

[0071] The preferred embodiments of the present disclosure are described in detail above with reference to the drawings, but the present disclosure is not limited to the specific details in the above-described embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

[0072] In addition, it should be noted that each specific technical feature described in the above-described specific embodiments can be combined in any appropriate manner without contradiction, and in order to avoid unnecessary repetition, the present disclosure will not describe various possible combinations again.

[0073] In addition, various different embodiments of the present disclosure can also be combined in any manner, as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A high set gate valve stem rotation stop device, characterized by, The high-tune door structure comprises a high-tune door shell, a first hole and a second hole are formed on the high-tune door shell; a shaft sleeve is located in the high-tune door shell and connected with a valve rod installed in the high-tune door shell, the shaft sleeve is used for synchronous movement with the valve rod; a linear variable differential transformer is connected with one end of the shaft sleeve and located in the first hole; an anti-rotation rod is connected with one end of the shaft sleeve and located in the second hole; a gap is arranged between the linear variable differential transformer and the first hole, a gap is arranged between the anti-rotation rod and the second hole, and the gap between the anti-rotation rod and the second hole is smaller than the gap between the linear variable differential transformer and the first hole, so that the horizontal swing range of the anti-rotation rod is smaller than the horizontal swing range of the linear variable differential transformer; the high-tune door shell comprises a shell body, the shell body is a hollow columnar structure, a plurality of through holes are arranged on the shell body and spaced apart in the circumferential direction, and the length direction of the through holes extends along the axial direction of the shell body; the high-tune door shell further comprises a guard plate and a pin shaft, the second hole is located on the guard plate, a first pin sleeve and a second pin sleeve are arranged at each of the two opposite edges along the length direction of the through hole, the first pin sleeve and the second pin sleeve are coaxial and spaced apart, a lug sleeve is arranged at each of the two opposite sides of the guard plate, the two lug sleeves are located between the first pin sleeve and the second pin sleeve at the two opposite edges of the through hole, and the pin shaft is sequentially arranged in the first pin sleeve, the lug sleeve and the second pin sleeve. The pin shaft is in an L-shaped structure. The length direction of the first hole and the length direction of the second hole both extend along the axial direction of the high-tune door shell, the linear variable differential transformer is used for moving along the length direction of the first hole under the driving of the valve rod, and the anti-rotation rod is used for moving along the length direction of the second hole under the driving of the valve rod. The cross section of the anti-rotation rod is square. The high-tune door structure comprises an oil driver connected with the valve rod, a part of the valve rod penetrates into the high-tune door shell, and the oil driver is used for driving the valve rod to move by adjusting the oil inlet amount. The high-tune door structure further comprises an elastic assembly located in the high-tune door shell, one end of the elastic assembly is connected with the high-tune door shell, and the other end of the elastic assembly is connected with the shaft sleeve, and the shaft sleeve is connected with the valve rod connected with the oil driver. The high-tune door structure comprises the high-tune door structure according to claim 5 or 6.

2. The high-timing gate valve stem rotation-stopping device according to claim 1, characterized by ​ 3. The high-timing gate valve stem rotation-stopping device according to claim 1, characterized by ​ 4. The high-timing gate valve stem rotation-stopping device according to claim 1, characterized by ​ 5. A high set door structure, characterized by, ​ 6. The high tuning gate structure of claim 5, wherein, ​ 7. A steam turbine, characterized by ​

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