Axial vibration control damping device and method for steam-water pipeline of thermal power plant

Abstract

The invention discloses a thermal power plant steam-water pipeline axial vibration control damping device and method, and relates to the technical field of axial vibration control damping devices, the thermal power plant steam-water pipeline axial vibration control damping device comprises a fixing mechanism and two sets of axial damping mechanisms, and one ends of the two sets of axial damping mechanisms are fixedly connected with bearing columns. When the steam-water pipeline generates large radial vibration, vibration impact is transmitted to the first spring through the pipeline clamping piece, the first spring is compressed to counteract exciting force so as to control radial vibration of the pipeline, the middle of the bearing seat is a solid transition cylinder, the bearing seat is a solid circular truncated cone with the radius gradually increased, and the solid circular truncated cone is embedded in the support. The root of the solid circular truncated cone is an expanded cylinder used for making contact with the second spring, the bearing base and the bearing piece can move up and down in the vertical direction to bear the self weight of the steam-water pipeline and other loads borne by the steam-water pipeline, meanwhile, radial vibration of the steam-water pipeline in the vertical direction can be controlled, and therefore effective buffering and vibration reduction are conducted on the steam-water pipeline. The service life of the steam-water pipeline is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of axial vibration control and damping devices, and in particular to an axial vibration control and damping device and method for a steam-water pipeline in a thermal power plant. Background Art

[0002] Pipeline vibration is one of the important factors that endanger pipeline safety. Steam and water pipelines in thermal power plants frequently suffer from pipeline vibration failures due to pulsation of the medium in the pipe, turbulence, equipment vibration transmission and other reasons. The relevant standards and specifications have strict regulations on the vibration level of steam and water pipelines in thermal power plants. If the vibration exceeds the standard, vibration control must be carried out; pipeline vibration will affect the normal readings and service life of the temperature and pressure instruments on the pipeline, and may even cause a chain shutdown protection action due to excessive deviation in the instrument readings; at the same time, alternating stress will be generated on the joints of pipelines and pipe fittings. Long-term large vibrations may induce loosening of the joints of pipelines and pipe fittings, resulting in leakage; for some high-temperature and high-pressure medium pipelines, once a leak occurs, casualties may occur.

[0003] Application number: CN 202022270662.4, a TMD vibration reduction device for axial vibration control of steam-water pipelines in thermal power plants, belongs to the category of pipeline vibration reduction and vibration control technology, and mainly uses the TMD (tuned mass damper) structure to absorb the vibration energy of the system, thereby reducing the vibration amplitude of the pipeline. The utility model includes a pipeline, an axial limit pipe clamp and a TMD structure. The TMD structure is directly installed on the vibrating pipeline through the pipe clamp without the need for a rooting point; the TMD structure mainly includes two sets of springs and mass blocks, and polymer damping materials are arranged on the contact surface of the mass block and the TMD cylinder. A threaded through hole is left on the mass block to facilitate the installation of an adjustment block and precise debugging during subsequent operation.

[0004] In order to solve the problem of vibration reduction of steam-water pipelines in thermal power plants in the above-mentioned technical solution, the existing technology uses springs and mass blocks for adjustment, but there is still a problem of insufficient vibration reduction of the steam-water pipelines, which leads to the problem that the steam-water pipelines are easily damaged. Summary of the invention

[0005] The object of the present invention is to provide a device and method for controlling and reducing axial vibration of steam-water pipelines in thermal power plants, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: An axial vibration control and damping device for steam-water pipelines in thermal power plants, comprising a fixing mechanism and an axial damping mechanism, wherein the axial damping mechanism comprises two groups, and one end of the two groups of axial damping mechanisms is fixedly connected with a receiving column; The fixing mechanism includes a limiting sleeve block, which is sleeved on the surface of the axial shock absorbing mechanism, one end of the limiting sleeve block is fixedly connected to a fixing sleeve, both sides of the fixing sleeve are fixedly connected to a first connecting plate, a fixing bolt is threadedly connected to the surface of the first connecting plate, one end of the fixing bolt is threadedly connected to the second connecting plate, one end of the second connecting plate is fixedly connected to a limiting sleeve, and one side of the limiting sleeve is fixedly connected to a support seat.

[0007] A further improvement of the present invention is that a buffer assembly is fixedly connected inside the fixing sleeve, and a vibration-damping seat is installed between the limiting sleeves.

[0008] A further improvement of the present invention is that the buffer assembly comprises a connecting column, the connecting column is fixedly connected to the inside of the fixing sleeve, and one end of the connecting column is fixedly connected to a welding seat.

[0009] A further improvement of the present invention is that a first spring is fixedly connected inside the welding seat, one end of the first spring is fixedly connected to a connecting plate, one end of the connecting plate is fixedly connected to a pipe clamping piece, and the connecting plate and the pipe clamping piece are movably connected inside the welding seat.

[0010] A further improvement of the present invention is that the support seat includes a support plate, the support plate is fixedly connected to one side of the limiting sleeve, holes are provided on the surface of the support plate, a limiting frame is movably connected to the surface of the support plate, one end of the limiting frame is fixedly connected to a bottom plate, a connecting bolt is threadedly connected between the limiting frame and the surface of the support plate, and a connecting hole is provided on the surface of the limiting frame.

[0011] A further improvement of the present invention is that the shock-absorbing seat includes a support, the support is fixedly connected to one end of the limiting sleeve, a second spring is fixedly connected inside the support, one end of the second spring is fixedly connected to a receiving seat, and one end of the receiving seat is fixedly connected to a receiving plate.

[0012] A further improvement of the present invention is that the axial damping mechanism comprises a piston cylinder, the piston cylinder is sleeved inside the limiting sleeve, a piston is arranged inside the piston cylinder, and the piston divides the piston cylinder into an upper chamber and a lower chamber.

[0013] A further improvement of the present invention is that a hollow piston rod is connected to the piston, an oil circuit for connecting the upper chamber and the lower chamber is provided in the hollow piston rod, an oil plug mounting chamber is provided in the oil circuit, a transmission rod is provided in the hollow piston rod, an oil plug is provided in the oil plug mounting chamber, and a sealing ring is provided on the oil plug.

[0014] A further improvement of the present invention is that one end of the transmission rod is abutted against a volute cam, one end of the volute cam is connected to a knob, one end of the knob is installed with a sleeve block, the end of the hollow piston rod is provided with a port, and the side wall of the hollow piston rod is provided with a side port.

[0015] A vibration reduction method for an axial vibration control and vibration reduction device of a steam-water pipeline in a thermal power plant, comprising: When the steam-water pipeline generates large radial vibration, the vibration is first transmitted to the receiving column, and the receiving column transmits the vibration to the axial shock-absorbing mechanism fixedly connected to it; at the same time, the fixing mechanism provides support and limitation for the axial shock-absorbing mechanism through the coordinated action of the limiting sleeve, the fixing sleeve, the first connecting plate, the fixing bolt, the second connecting plate and the limiting sleeve, so as to prevent it from excessive displacement or deformation during the vibration process; through the joint action of the axial shock-absorbing mechanism and the fixing mechanism, the axial vibration of the steam-water pipeline is controlled and reduced.

[0016] Compared with the prior art, the present invention has at least the following beneficial technical effects: The present invention provides an axial vibration control and vibration reduction device and method for a steam-water pipeline in a thermal power plant. When the steam-water pipeline generates a large radial vibration, the vibration impact is transmitted to a first spring through a pipeline clamping plate, and the radial vibration of the pipeline is controlled by compressing the first spring to offset the exciting force. The middle part of the receiving seat is a solid transition cylinder, and the receiving seat is a solid frustum with a gradually increasing radius. The solid frustum is embedded in the support, and the root of the solid frustum is an enlarged diameter cylinder for contacting the second spring. The receiving seat and the receiving plate can move up and down in the vertical direction to bear the weight of the steam-water pipeline itself and other loads it is subjected to, and at the same time, the radial vibration of the steam-water pipeline in the vertical direction can be controlled, thereby effectively buffering and reducing the vibration of the steam-water pipeline and improving the service life of the steam-water pipeline.

[0017] The present invention provides a device and method for controlling axial vibration of a steam-water pipeline in a thermal power plant. When the volute cam pushes the transmission rod to close the oil circuit with the oil plug, the oil can only be exchanged between the upper and lower chambers by pushing the valve plate on the piston like a conventional shock absorber. The volute cam can completely open the oil plug or open the oil plug in increments within its adjustment displacement range L. The passage of the open oil circuit is determined by the different rotation angles of the volute cam. This is to effectively control the opening size of the oil circuit in the center of the hollow piston rod by utilizing the design of the volute cam, which makes a good contribution to the low-speed damping control of the shock absorber, thereby reducing the vibration and shaking of the steam-water pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the fixing mechanism of the present invention; Figure 3 It is a structural schematic diagram of the support base of the present invention; Figure 4 It is a schematic diagram of the structure of the buffer assembly of the present invention; Figure 5 It is a structural schematic diagram of the shock absorbing mechanism of the present invention; Figure 6 It is a structural schematic diagram of the sealing ring of the present invention; Figure 7 It is a schematic structural diagram of the vibration damping seat of the present invention.

[0020] Description of reference numerals: 1. Support seat; 10. Support plate; 11. Hole; 12. Connecting bolt; 13. Limiting frame; 14. Bottom plate; 15. Connecting hole; 2. Fixing mechanism; 20. Fixing sleeve; 21. Limiting sleeve block; 22. First connecting plate; 23. Fixing bolt; 24. Vibration damping seat; 240. Support; 241. Second spring; 242. Receiver seat; 243. Receiver sheet; 25. Buffer assembly; 250. Connecting column; 251. Welding seat; 252. The first spring; 253, connecting plate; 254, pipe clamping plate; 26, limiting sleeve; 27, second connecting plate; 3, shock absorbing mechanism; 30, piston cylinder; 31, lower chamber; 32, sleeve block; 33, knob; 34, hollow piston rod; 35, transmission rod; 36, sealing ring; 37, oil plug; 38, oil plug installation chamber; 39, port; 391, piston; 392, side port; 393, upper chamber; 394, volute cam; 4, receiving column. DETAILED DESCRIPTION

[0021] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0027] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] Example 1 like Figure 1-7 As shown, the present invention provides an axial vibration control and vibration reduction device for a steam-water pipeline in a thermal power plant, comprising a fixing mechanism 2 and an axial vibration reduction mechanism 3, wherein the axial vibration reduction mechanism 3 is divided into two groups, and one end of the two groups of axial vibration reduction mechanisms 3 is fixedly connected to a receiving column 4, and the fixing mechanism 2 comprises a limiting sleeve block 21, and the limiting sleeve block 21 is sleeved on the surface of the axial vibration reduction mechanism 3, and one end of the limiting sleeve block 21 is fixedly connected to a fixing sleeve 20, and both sides of the fixing sleeve 20 are fixedly connected to a first connecting plate 22, and the surface of the first connecting plate 22 is threadedly connected to a fixing bolt 23, and one end of the fixing bolt 23 is threadedly connected to a second connecting plate 27, and one end of the second connecting plate 27 is fixedly connected to a limiting sleeve 26, and one side of the limiting sleeve 26 is fixedly connected to a support seat 1, and the interior of the fixing sleeve 20 is fixedly connected to a buffer component 25, and the limiting sleeve 26 is fixedly connected to the inside of the fixing sleeve 20. A vibration damping seat 24 is installed in the middle, and the buffer assembly 25 includes a connecting column 250, which is fixedly connected to the inside of the fixed sleeve 20, and one end of the connecting column 250 is fixedly connected to a welding seat 251, and the inside of the welding seat 251 is fixedly connected to a first spring 252, and one end of the first spring 252 is fixedly connected to a connecting plate 253, and one end of the connecting plate 253 is fixedly connected to a pipe clamping piece 254, and the connecting plate 253 and the pipe clamping piece 254 are movably connected to the inside of the welding seat 251, and the vibration damping seat 24 includes a support 240, and the support 240 is fixedly connected to one end of the limiting sleeve 26, and the inside of the support 240 is fixedly connected to a second spring 241, and one end of the second spring 241 is fixedly connected to a receiving seat 242, and one end of the receiving seat 242 is fixedly connected to a receiving piece 243.

[0031] Specifically, when the steam-water pipeline generates a large radial vibration, the vibration impact is transmitted to the first spring 252 through the pipeline clamping plate 254. The radial vibration of the pipeline is controlled by compressing the first spring 252 to offset the exciting force. The middle part of the receiving seat 242 is a solid transition cylinder. The receiving seat 242 is a solid frustum with a gradually increasing radius. The solid frustum is embedded in the support 240. The root of the solid frustum is an enlarged diameter cylinder for contacting the second spring 241. The receiving seat 242 and the receiving plate 243 can move up and down in the vertical direction to bear the weight of the steam-water pipeline itself and other loads, and at the same time can control the radial vibration of the steam-water pipeline in the vertical direction.

[0032] Example 2 like Figure 1-7 As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, the support seat 1 includes a support plate 10, the support plate 10 is fixedly connected to one side of the limiting sleeve 26, the surface of the support plate 10 is provided with a hole 11, the surface of the support plate 10 is movably connected with a limiting frame 13, one end of the limiting frame 13 is fixedly connected with a bottom plate 14, the limiting frame 13 and the surface of the support plate 10 are threadedly connected with a connecting bolt 12, the surface of the limiting frame 13 is provided with a connecting hole 15, the axial shock absorbing mechanism 3 includes a piston cylinder 30, the piston cylinder 30 is sleeved inside the limiting sleeve block 21, the piston cylinder 30 is provided with a piston 391, and the piston 391 will The piston cylinder 30 is divided into an upper chamber 393 and a lower chamber 31. A hollow piston rod 34 is connected to the piston 391. An oil circuit for connecting the upper chamber 393 and the lower chamber 31 is provided in the hollow piston rod 34. An oil plug mounting chamber 38 is provided in the oil circuit. A transmission rod 35 is provided in the hollow piston rod 34. An oil plug 37 is provided in the oil plug mounting chamber 38. A sealing ring 36 is sleeved on the oil plug 37. A volute cam 394 is abutted at one end of the transmission rod 35. A knob 33 is connected to one end of the volute cam 394. A sleeve block 32 is installed at one end of the knob 33. A port 39 is provided at the end of the hollow piston rod 34. A side port 392 is provided on the side wall of the hollow piston rod 34.

[0033] Specifically, the volute cam 394 is rotated by the knob 33, so that the volute cam 394 pushes the transmission rod 35 to move the oil plug 37, and the oil plug 37 moves in the oil circuit to adjust the flow rate in the oil circuit, so that the oil circulation volume changes linearly, so that the damping effect of the shock absorber can be adjusted. The end of the oil plug 37 is a ball head shape, and the port 39 is a round hole. The ball head is opposite to the port 39. When the oil circuit is closed, the oil plug 37 can move to completely block and close the port 39, thereby closing the oil circuit. In addition, in order to prevent the oil from entering the hollow piston rod 34, at least one sealing ring 36 is sleeved on the oil plug 37, so that the oil is isolated and only circulates in the upper chamber 393 and the lower chamber 31 and the oil circuit. In summary, when the volute cam 394 pushes the transmission rod 35 to make the oil plug 37 close the oil circuit, the oil can only be exchanged between the upper and lower chambers by pushing the valve plate on the piston 391 like a conventional shock absorber. The volute cam 394 can completely open the oil plug 37 or open the oil plug 37 in an indexed manner within its adjustment displacement range L, and the channel of the open oil circuit is determined according to the different rotation angles of the volute cam 394. This is to utilize the design of the volute cam 394 to effectively control the size of the oil circuit opening in the center of the hollow piston rod 34, which makes a great contribution to the low-speed damping control of the shock absorber, thereby reducing the vibration and shaking of the steam-water pipeline. The entire mechanism is supported by the support seat 1, and the connecting bolt 12 is rotated so that the support plate 10 can be movably adjusted to a suitable height inside the limiting frame 13, and then the limiting frame 13 and the support plate 10 are fixed by rotating the connecting bolt 12.

[0034] The working principle of the axial vibration control and vibration reduction device of the steam-water pipeline in the thermal power plant is described in detail below.

[0035] like Figure 1-7As shown, when the steam-water pipeline generates a large radial vibration, the vibration impact is transmitted to the first spring 252 through the pipeline clamping piece 254, and the radial vibration of the pipeline is controlled by compressing the first spring 252 to offset the exciting force. The middle part of the receiving seat 242 is a solid transition cylinder, and the receiving seat 242 is a solid truncated cone with a gradually increasing radius. The solid truncated cone is embedded in the support 240, and the root of the solid truncated cone is an enlarged diameter cylinder for contacting the second spring 241. The receiving seat 242 and the receiving piece 243 can be along It moves up and down in the vertical direction, bearing the weight of the steam-water pipeline itself and other loads, and can control the radial vibration of the steam-water pipeline in the vertical direction. The volute cam 394 is rotated by the rotating mechanism, so that the volute cam 394 pushes the transmission rod 35 to move the oil plug 37, and the oil plug 37 moves in the oil circuit to adjust the flow in the oil circuit, so that the oil circulation volume changes linearly, so that the damping effect of the shock absorber can be adjusted. The end of the oil plug 37 is a ball head shape, and the port 39 is a round hole, and the ball head is opposite to the port 39. When the oil circuit is closed, the oil plug 37 can move to completely block and close the port 39, thereby closing the oil circuit. In addition, in order to prevent the oil from entering the hollow piston rod 34, at least one sealing ring 36 is sleeved on the oil plug 37, so that the oil is isolated and only circulates in the upper chamber 393, the lower chamber 31 and the oil circuit. In summary, when the volute cam 394 pushes the transmission rod 35 to close the oil plug 37, the oil can only be exchanged between the upper and lower chambers by pushing the valve plate on the piston 391 like a conventional shock absorber. The volute cam 394 can fully open the oil plug 37 or open the oil plug 37 in increments within its adjustment displacement range L, and the channel of the open oil circuit is determined by the different rotation angles of the volute cam 394; that is, the design of the volute cam 394 is used to effectively control the opening size of the oil circuit in the center of the hollow piston rod 34, which makes a good contribution to the low-speed damping control of the shock absorber.

[0036] Example 3 like Figure 1-7 As shown, the present invention provides a vibration reduction method for an axial vibration control and vibration reduction device of a steam-water pipeline in a thermal power plant, comprising: When the steam-water pipeline generates a large radial vibration, the vibration is first transmitted to the receiving column 4, and the receiving column 4 transmits the vibration to the axial shock-absorbing mechanism 3 fixedly connected thereto; at the same time, the fixing mechanism 2 provides support and limitation for the axial shock-absorbing mechanism 3 through the coordinated action of the limiting sleeve 21, the fixing sleeve 20, the first connecting plate 22, the fixing bolt 23, the second connecting plate 27 and the limiting sleeve 26, so as to prevent it from excessive displacement or deformation during the vibration process; through the joint action of the axial shock-absorbing mechanism 3 and the fixing mechanism 2, the axial vibration of the steam-water pipeline is controlled and reduced.

[0037] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0038] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A device for controlling and reducing axial vibration of steam-water pipelines in thermal power plants, characterized in that: It comprises a fixing mechanism (2) and an axial shock absorbing mechanism (3), wherein the axial shock absorbing mechanism (3) is divided into two groups, and one end of the two groups of axial shock absorbing mechanisms (3) is fixedly connected to a receiving column (4); The fixing mechanism (2) comprises a limiting sleeve block (21), the limiting sleeve block (21) being sleeved on the surface of the axial damping mechanism (3), one end of the limiting sleeve block (21) being fixedly connected to a fixing sleeve (20), both sides of the fixing sleeve (20) being fixedly connected to first connecting plates (22), a fixing bolt (23) being threadedly connected to the surface of the first connecting plate (22), one end of the fixing bolt (23) being threadedly connected to a second connecting plate (27), one end of the second connecting plate (27) being fixedly connected to a limiting sleeve (26), and one side of the limiting sleeve (26) being fixedly connected to a support seat (1).

2. The device for controlling axial vibration of steam-water pipelines in thermal power plants according to claim 1 is characterized in that: A buffer assembly (25) is fixedly connected inside the fixing sleeve (20), and a vibration-damping seat (24) is installed between the limiting sleeves (26).

3. The axial vibration control and damping device for steam-water pipelines in thermal power plants according to claim 2 is characterized in that: The buffer assembly (25) comprises a connecting column (250), wherein the connecting column (250) is fixedly connected to the interior of the fixing sleeve (20), and one end of the connecting column (250) is fixedly connected to a welding seat (251).

4. The device for controlling axial vibration of steam-water pipelines in thermal power plants according to claim 3 is characterized in that: A first spring (252) is fixedly connected inside the welding seat (251); one end of the first spring (252) is fixedly connected to a connecting plate (253); one end of the connecting plate (253) is fixedly connected to a pipe clamping piece (254); the connecting plate (253) and the pipe clamping piece (254) are movably connected inside the welding seat (251).

5. The device for controlling and damping axial vibration of steam-water pipelines in thermal power plants according to claim 1 is characterized in that: The support seat (1) comprises a support plate (10), the support plate (10) is fixedly connected to one side of a limiting sleeve (26), a hole (11) is provided on the surface of the support plate (10), a limiting frame (13) is movably connected to the surface of the support plate (10), one end of the limiting frame (13) is fixedly connected to a bottom plate (14), a connecting bolt (12) is threadedly connected to the surface of the limiting frame (13) and the support plate (10), and a connecting hole (15) is provided on the surface of the limiting frame (13).

6. The device for controlling axial vibration of steam-water pipelines in thermal power plants according to claim 2 is characterized in that: The vibration damping seat (24) comprises a support (240), the support (240) being fixedly connected to one end of the limiting sleeve (26), a second spring (241) being fixedly connected inside the support (240), one end of the second spring (241) being fixedly connected to a receiving seat (242), and one end of the receiving seat (242) being fixedly connected to a receiving sheet (243).

7. The device for controlling and reducing axial vibration of steam-water pipelines in thermal power plants according to claim 1 is characterized in that: The axial damping mechanism (3) comprises a piston cylinder (30), the piston cylinder (30) being sleeved inside a limiting sleeve block (21), a piston (391) being arranged inside the piston cylinder (30), and the piston (391) dividing the piston cylinder (30) into an upper chamber (393) and a lower chamber (31).

8. The device for controlling and reducing axial vibration of steam-water pipelines in thermal power plants according to claim 7 is characterized in that: The piston (391) is connected to a hollow piston rod (34), an oil circuit for connecting the upper chamber (393) and the lower chamber (31) is provided in the hollow piston rod (34), an oil plug installation chamber (38) is provided in the oil circuit, a transmission rod (35) is provided in the hollow piston rod (34), an oil plug (37) is provided in the oil plug installation chamber (38), and a sealing ring (36) is sleeved on the oil plug (37).

9. The device for controlling and damping axial vibration of steam-water pipelines in thermal power plants according to claim 8 is characterized in that: One end of the transmission rod (35) is in contact with a volute cam (394), one end of the volute cam (394) is connected to a knob (33), one end of the knob (33) is mounted with a sleeve block (32), the end of the hollow piston rod (34) is provided with a port (39), and the side wall of the hollow piston rod (34) is provided with a side port (392).

10. A vibration reduction method for an axial vibration control and vibration reduction device for steam-water pipelines in a thermal power plant according to any one of claims 1 to 9, characterized in that: include: When the steam-water pipeline generates a large radial vibration, the vibration is first transmitted to the receiving column (4), and the receiving column (4) transmits the vibration to the axial shock absorbing mechanism (3) fixedly connected thereto; at the same time, the fixing mechanism (2) provides support and limitation for the axial shock absorbing mechanism (3) through the coordinated action of the limiting sleeve block (21), the fixing sleeve (20), the first connecting plate (22), the fixing bolt (23), the second connecting plate (27) and the limiting sleeve (26), thereby preventing the axial shock absorbing mechanism (3) from excessive displacement or deformation during the vibration process; through the combined action of the axial shock absorbing mechanism (3) and the fixing mechanism (2), the axial vibration of the steam-water pipeline is controlled and reduced.

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