Vibration noise control system and method for power plant power transformer

Abstract

The present application relates to the technical field of transformer noise control, and particularly relates to a vibration noise control system and method for a power plant power transformer, the vibration noise control system for the power plant power transformer, which comprises a transformer and a core column connected by a structural member inside the transformer, and a vibration absorber is installed on the surface of the transformer at least on the upper side of any core column, when a hydraulic cylinder is stretched, the upward force exerted on the top end of the lever by the upward movement of the lifting plate, the downward force exerted on the other side of the fulcrum of the pressure plate, and the shorter force arm of the pressure plate can amplify the torque, in the same high-vibration area, the first connecting member and the second connecting member generate downward pressure on the upper surface of the transformer to form a downward pressure surface, the third connecting member between the first connecting member and the second connecting member generates upward tension on the upper surface of the transformer to form an upward tension surface, so that the vibration of the transformer is inhibited through repeated positioning up and down in the high-vibration area.

Description

Technical Field

[0001] This invention relates to the field of transformer noise control technology, specifically to a vibration and noise control system and method for power transformers in power plants. Background Technology

[0002] When the transformer core and coils vibrate, the vibration energy is transmitted to the surface of the transformer tank through solid materials (such as structural supports, insulation components, etc.) and air.

[0003] Long-term observations have shown that, due to the weight of the tank itself and the transformer body, the vibration displacement at the bottom of the tank is less than that at the top and sides, and the vibration displacement of the transformer tank is mainly concentrated at the top.

[0004] More specifically, the location of the maximum displacement of vibration at the top of the tank corresponds one-to-one with the position of the three core columns of the iron core. Therefore, the main reason for the maximum vibration at the top of the tank is the propagation of the iron core vibration. When a power transformer is in an irregular or excessive vibration state for a long time, it will damage the internal structure of the transformer, which may cause the winding coils to loosen, the iron core clamping parts to deform, and the insulation components to wear, resulting in leakage and breakdown.

[0005] Currently, vibration reduction and noise reduction mainly focus on the following aspects: vibration isolation of the transformer body, vibration isolation of the entire transformer, modification of the transformer tank, and construction of sound barriers on the outside of the entire transformer.

[0006] Adding vibration isolation measures to the outside of the transformer tank can reduce some of the vibration and noise, but it cannot protect the internal structure of the transformer. The effect is basically the same as building an external sound barrier, and it cannot meet the requirement of extending the service life.

[0007] Improvements to transformer tank design, including increasing tank wall thickness, adding reinforcing ribs, and altering the arrangement of reinforcing ribs, require a complete redesign of the transformer tank structure, making them unsuitable for mass-produced transformers. Therefore, this invention proposes a vibration absorber design for oil-immersed transformers that requires no alteration to the original transformer structure, is easy to install, reusable, and meets environmental protection requirements. Summary of the Invention

[0008] The purpose of this invention is to provide a vibration and noise control system and method for power transformers in power plants, which does not require any changes to the original structure of the transformer and can greatly limit vibration displacement, thereby playing a role in protection and noise reduction.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a vibration and noise control system for power transformers in power plants, comprising a transformer and core columns connected internally by structural components, wherein a vibration absorber is installed on the upper side of at least one core column and on the surface of the transformer.

[0010] After vibration monitoring of the transformer, vibration absorbers can also be installed at other locations of the transformer where vibration is greater.

[0011] The vibration absorber includes a conical shell and a connecting ring. The connecting ring is fixedly connected to the bottom end of the conical shell, and the bottom end of the connecting ring is fixedly connected to the upper surface of the transformer. The connecting ring is made of rubber, and the rubber connecting ring can play a role in absorbing vibration. The conical shell can continuously reflect sound inside it, and gradually weaken it in the reflection, which also plays a role in absorbing vibration.

[0012] A hydraulic cylinder is installed on the inner side of the conical shell. A first connecting piece is fixedly connected to the bottom end of the hydraulic cylinder, and a lifting plate is fixedly connected to the top end of the hydraulic cylinder. Multiple traction ropes are fixedly connected to the bottom edge of the lifting plate, and a third connecting piece is fixedly connected between the bottom end of the traction ropes and the upper surface of the transformer.

[0013] When the hydraulic cylinder extends, it exerts downward pressure on the first connecting member and upward force on the lifting plate. This upward force is transmitted to the third connecting member through the traction rope.

[0014] A support plate is fixedly connected to the outer side of the third connector and the upper surface of the transformer. A lever is rotatably connected to the top of the support plate via a rotating shaft. The upper side of the lever slides in a groove opened on the inner side of the outer edge of the lifting plate. A pressure plate is fixedly connected to the bottom end of the lever. A rubber wheel is slidably connected to the inner side of the bottom end of the pressure plate. A second connector is provided between the rubber wheel and the upper surface of the transformer.

[0015] When the hydraulic cylinder extends, the rising of the lifting plate will exert an upward force on the top of the lever, while the pressure plate on the other side of its fulcrum will generate a downward force. Moreover, the lever arm of the pressure plate is relatively short, which can amplify the torque.

[0016] As a preferred embodiment of the vibration and noise control system for power transformers in power plants according to the present invention, when the hydraulic cylinder extends, in the same high vibration zone, the first connecting member and the second connecting member exert downward pressure on the upper surface of the transformer to form a downward pressure surface, and the third connecting member between the first connecting member and the second connecting member exerts upward tension on the upper surface of the transformer to form an upward tension surface, thereby suppressing the vibration of the transformer in the high vibration zone by repeatedly limiting the upper and lower positions.

[0017] In this invention, by isolating the transformer body from vibration, not only can the transformer body be protected, but the vibration source that generates sound can also be suppressed, reducing noise. Unlike simply limiting vibration with downward pressure, this invention uses two downward pressure surfaces and an upward pull surface in the middle for limiting, which can limit the vibration displacement of the high vibration zone from multiple dimensions. Limiting in a single or two directions cannot achieve multi-dimensional limiting. Furthermore, the generation of the downward pressure surface and the upward pull surface on the transformer surface is achieved by only one hydraulic cylinder, which greatly facilitates operation.

[0018] As a preferred embodiment of the vibration and noise control system for power transformers in power plants according to the present invention, the hydraulic cylinder includes an upper mother cylinder, a piston slidably connected to the inner side of the mother cylinder, a push rod fixedly connected to the bottom end of the piston, the push rod being fixedly connected to the top end of the first connecting member, the mother cylinder being fixedly connected to the bottom end of the lifting plate, a soft oil pipe communicating with the inner side of the top end of the mother cylinder, the soft oil pipe passing through the lifting plate and communicating with the output end of the oil pump, the oil pump having its own oil storage chamber, the oil pump being fixed on the upper side of the top end of the conical shell, and the oil pump being a piston type.

[0019] This invention makes a slight modification to the existing hydraulic cylinder. When the oil pump is working, the oil enters the main cylinder through the soft oil pipe, the piston moves downward, and the two ends of the hydraulic cylinder generate an upward pulling force and a downward pressure, respectively.

[0020] As a preferred embodiment of the vibration and noise control system for power transformers in power plants according to the present invention, the first, second, and third connecting members each include, from top to bottom, a force sensor, an upper metal plate, and a lower soft pad. The lower soft pad, made of rubber, is fixedly connected to the bottom end of the upper metal plate and is fixedly connected to the upper surface of the transformer by adhesive. The force sensor is fixedly connected to the top end of the upper metal plate. The upper metal plate provides a rigid connection. The force sensor is prior art and will not be elaborated further here; it can measure the magnitude of downward pressure or upward tension.

[0021] In this invention, in order to ensure that the driving force of the hydraulic cylinder acts on the three connecting plates simultaneously, the length of the traction rope and the downward pressing angle of the lever need to be preset. The lower soft pad is also retractable and can play a role in distance compensation, which can reduce the difficulty of preset.

[0022] In this invention, the lower soft pad at the bottom of the connector can absorb and reduce the transmission of vibration, further reducing vibration. The force sensor obtains the magnitude of the downward pressure and upward tension. In this invention, both the first and third connectors are directly driven by hydraulic cylinders, which can adjust the vibration suppression torque and distribution according to the actual vibration value in the high vibration zone.

[0023] In a preferred embodiment of the vibration and noise control system for power transformers in power plants according to the present invention, the third connector is arranged in a ring-shaped dot pattern on the outside of the first connector, and the second connector is arranged in a ring-shaped dot pattern on the outside of the third connector, with the second and third connectors staggered from each other. This dot-shaped distribution and staggered arrangement of the second and third connectors provides a more comprehensive suppression angle.

[0024] In a preferred embodiment of the vibration and noise control system for power transformers in power plants according to the present invention, a connecting column extending vertically through the inner side of the connecting ring is fixedly connected, with both ends of the connecting column fixedly connected to the upper surface of the transformer and the bottom end of the conical shell, respectively. The connecting column serves as a reinforcing rib, which will not be elaborated further here.

[0025] As a preferred embodiment of the vibration and noise control system for power transformers in power plants according to the present invention, the surface of the upper metal plate in the second connector is slidably connected to the surface of the support plate through a limiting groove. This connection method can ensure the verticality of the downward pressure. In order to avoid jamming, a support plate and a limiting groove can also be provided on the other side of the upper metal plate in the second connector.

[0026] Preferably, in the vibration and noise control system of the present invention for power transformers in power plants, a lead screw is rotatably connected to the inner side of the pressure plate, and a motor is fixedly connected to one side of the pressure plate. The output end of the motor is fixedly connected to one end of the lead screw. A slider is slidably connected to the inner side of the pressure plate, and the inner side of the slider is helically connected to the inner side of the lead screw. When the motor rotates, the lead screw can drive the slider to move, and the slider then drives the rubber wheel to slide on the upper surface of the second connecting member. The rubber wheel is compressible. When the lever is under force, the pressure plate will tilt (non-horizontal state). The gap between the pressure plate and the second connecting member is variable. Therefore, when the rubber wheel slides, as the gap increases or decreases, the downward pressure applied by the second connecting member to the upper surface of the transformer will change, thereby realizing the control of the clamping force.

[0027] Preferably, in the vibration and noise control system of the present invention for power transformers in power plants, partitions are uniformly fixedly connected to the inner side of the conical shell, and there are reflective grooves between adjacent partitions. The conical shell can be filled with insulating oil to absorb energy and play a role in noise reduction and sound absorption.

[0028] In the above configuration, the conical shape of the conical shell, the liquid insulating oil, and the spacers are all designed to absorb vibration and reduce noise.

[0029] A vibration and noise control method for power transformers in power plants, using the vibration and noise control system as described in claim 8, characterized in that its steps are as follows:

[0030] Step 1: Installation. Vibration absorbers are installed on the upper side of at least one core post and on the surface of the transformer.

[0031] Step 2: Adjust the limiting force by changing the jacking force of the hydraulic cylinder and adjusting the position of the slider within the pressure plate to adjust the limiting force in the high vibration zone;

[0032] Step 3: In the same high vibration zone, the first and second connectors exert downward pressure on the upper surface of the transformer to form a downward pressure surface, while the third connector between the first and second connectors exerts upward tension on the upper surface of the transformer to form an upward tension surface. Thus, the transformer vibration is suppressed in the high vibration zone by repeatedly limiting the upper and lower parts.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1. This vibration and noise control system is used for power transformers in power plants. After the transformer is monitored for vibration, the vibration absorber can also be installed at other locations of the transformer with greater vibration. The vibration absorber includes a conical shell and a connecting ring. The connecting ring is fixedly connected to the bottom end of the conical shell, and the bottom end of the connecting ring is fixedly connected to the upper surface of the transformer. The connecting ring is made of rubber, which can absorb vibration. The conical shell can continuously reflect sound inside, which gradually weakens during reflection, and also serves to absorb vibration.

[0035] 2. The vibration and noise control system for power transformers in power plants uses a lifting plate that applies an upward force to the top of the lever when it rises. The pressure plate on the other side of the fulcrum will generate a downward force. The lever arm of the pressure plate is relatively short, which can amplify the torque.

[0036] 3. The vibration and noise control system for power transformers in power plants, when the hydraulic cylinder extends, in the same high vibration zone, the first and second connecting parts exert downward pressure on the upper surface of the transformer to form a downward pressure surface, and the third connecting part between the first and second connecting parts exerts upward tension on the upper surface of the transformer to form an upward tension surface. Thus, in the high vibration zone, the vibration of the transformer is suppressed by repeatedly limiting the upper and lower parts.

[0037] 4. This vibration and noise control system for power transformers in power plants not only protects the transformer body by isolating it from vibration, but also suppresses the vibration sources that generate sound and reduces noise. Unlike simply limiting vibration with downward pressure, this invention uses two downward pressure surfaces and an upward pull surface in the middle for limiting, which can limit the vibration displacement of the high vibration zone from multiple dimensions. Limiting in one or two directions cannot achieve multi-dimensional limiting. Furthermore, the generation of the downward pressure surface and the upward pull surface on the transformer surface is achieved by only one hydraulic cylinder, which greatly facilitates operation.

[0038] 5. In this vibration and noise control system for power transformers in power plants, the lower soft pad at the bottom of the connector can absorb and reduce the transmission of vibration, further reducing vibration. The force sensor obtains the magnitude of the downward pressure and upward tension. In this invention, both the first and third connectors are directly driven by hydraulic cylinders. The slider then drives the rubber wheel to slide on the upper surface of the second connector. The rubber wheel is compressible. When the rubber wheel slides, the downward pressure applied by the second connector to the upper surface of the transformer will change, thereby realizing the control of the clamping force.

[0039] 6. The vibration and noise control system for power transformers in power plants uses a conical shell, liquid insulating oil, and spacers to absorb vibration and reduce noise. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention;

[0041] Figure 2 This is a schematic diagram showing the minimum installation locations of the vibration absorber of the present invention;

[0042] Figure 3 This is a schematic diagram illustrating the principle of vibration suppression in this invention;

[0043] Figure 4 This is a schematic diagram of the external structure of the vibration absorber of the present invention;

[0044] Figure 5 For the present invention Figure 4 Schematic diagram of the internal structure of the AA' section;

[0045] Figure 6 For the present invention Figure 4 Internal sectional view of the middle BB' section;

[0046] Figure 7 This is a schematic diagram of the internal cross-sectional structure of the hydraulic cylinder of the present invention;

[0047] Figure 8 This is a schematic diagram of the external structure of the lifting plate of the present invention;

[0048] Figure 9 This is a schematic diagram of the internal cross-sectional structure of the conical shell of the present invention;

[0049] Figure 10 This is a cross-sectional view of the connecting ring of the present invention;

[0050] Figure 11 This is a schematic diagram of the internal mounting structure of the pressure plate of the present invention;

[0051] Figure 12 This is a schematic diagram of the connector of the present invention.

[0052] In the diagram: 1. Transformer; 2. Conical shell; 21. Connecting ring; 22. Spacing plate; 23. Reflector groove; 211. Connecting column; 3. Core column; 4. High vibration zone; 41. Lower pressure surface; 42. Upper pull surface; 5. First connecting piece; 6. Second connecting piece; 7. Third connecting piece; 8. Oil pump; 9. Soft oil pipe; 10. Lifting plate; 101. Slide groove; 11. Hydraulic cylinder; 111. Mother cylinder; 112. Piston; 113. Push rod; 12. Lever; 121. Pressure plate; 1211. Motor; 1212. Slider; 1213. Lead screw; 1214. Rubber wheel; 13. Support plate; 14. Traction rope;

[0053] c. Upper metal plate; d. Lower soft pad; e. Force sensor. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] Example 1, please refer to Figures 1-10 and Figure 12 The present invention provides a technical solution:

[0056] A vibration and noise control system for power transformers in power plants includes a transformer 1 and a core column 3 connected internally by structural components, with a vibration absorber installed on the upper side of at least one core column 3 and on the surface of the transformer 1.

[0057] After vibration monitoring of transformer 1, vibration absorbers can also be installed at other locations of transformer 1 where vibration is greater.

[0058] The vibration absorber includes a conical shell 2 and a connecting ring 21. The connecting ring 21 is fixedly connected to the bottom end of the conical shell 2. The bottom end of the connecting ring 21 is fixedly connected to the upper surface of the transformer 1. The connecting ring 21 is made of rubber. The rubber connecting ring 21 can play the role of vibration absorption. The conical shell 2 can continuously reflect sound inside it, and gradually weaken it in the reflection, which also plays the role of vibration absorption.

[0059] A hydraulic cylinder 11 is provided on the inner side of the conical shell 2. A first connecting piece 5 is fixedly connected to the bottom end of the hydraulic cylinder 11. A lifting plate 10 is fixedly connected to the top end of the hydraulic cylinder 11. Multiple traction ropes 14 are fixedly connected to the bottom end of the outer edge of the lifting plate 10. A third connecting piece 7 is fixedly connected between the bottom end of the traction rope 14 and the upper surface of the transformer 1.

[0060] When the hydraulic cylinder 11 extends, it exerts downward pressure on the first connecting member 5 and upward force on the lifting plate 10. This upward force is transmitted to the third connecting member 7 through the traction rope 14.

[0061] A support plate 13 is fixedly connected to the outer side of the third connector 7 and the upper surface of the transformer 1. A lever 12 is rotatably connected to the top of the support plate 13 via a rotating shaft. The upper side of the lever 12 slides in the groove 101 opened on the inner side of the outer edge of the lifting plate 10. A pressure plate 121 is fixedly connected to the bottom end of the lever 12. A rubber wheel 1214 is slidably connected to the inner side of the bottom end of the pressure plate 121. A second connector 6 is provided between the rubber wheel 1214 and the upper surface of the transformer 1.

[0062] When the hydraulic cylinder 11 extends, the rise of the lifting plate 10 will exert an upward force on the top of the lever 12, while the pressure plate 121 on the other side of its fulcrum will generate a downward force. Moreover, the lever arm on which the pressure plate 121 sits is relatively short, which can amplify the torque.

[0063] Specifically, when the hydraulic cylinder 11 extends, in the same high vibration zone 4, the first connecting piece 5 and the second connecting piece 6 exert downward pressure on the upper surface of the transformer 1 to form a downward pressure surface 41, and the third connecting piece 7 between the first connecting piece 5 and the second connecting piece 6 exerts upward tension on the upper surface of the transformer 1 to form an upward tension surface 42. Thus, in the high vibration zone 4, the vibration of the transformer 1 is suppressed by repeatedly limiting the upper and lower positions.

[0064] In this invention, by isolating the transformer body, not only can the transformer body be protected, but the vibration source that generates sound can also be suppressed, reducing noise. Unlike simply limiting vibration by downward pressure, this invention uses two downward pressure surfaces 41 and an upward pull surface 42 in the middle for limiting, which can limit the vibration displacement of the high vibration zone 4 from multiple dimensions. Limiting in a single direction or two directions cannot achieve multi-dimensional limiting. Furthermore, the generation of the downward pressure surface 41 and the upward pull surface 42 on the surface of the transformer 1 is achieved by only one hydraulic cylinder 11, which greatly facilitates operation.

[0065] Specifically, the hydraulic cylinder 11 includes an upper mother cylinder 111, a piston 112 is slidably connected to the inner side of the mother cylinder 111, a push rod 113 is fixedly connected to the bottom end of the piston 112, the push rod 113 is fixedly connected to the top end of the first connecting member 5, the mother cylinder 111 is fixedly connected to the bottom end of the lifting plate 10, a soft oil pipe 9 is connected to the inner side of the top end of the mother cylinder 111, the soft oil pipe 9 passes through the lifting plate 10 and connects to the output end of the oil pump 8, the oil pump 8 has its own oil storage chamber, the oil pump 8 is fixed on the upper side of the top end of the cone shell 2, and the oil pump 8 is a piston type.

[0066] The present invention makes a slight modification to the existing hydraulic cylinder 11. When the oil pump 8 is working, the oil enters the mother cylinder 111 through the soft oil pipe 9, the piston 112 moves downward, and the two ends of the hydraulic cylinder 11 generate an upward pulling force and a downward pressure, respectively.

[0067] Specifically, the first connecting member 5, the second connecting member 6, and the third connecting member 7 each include, from top to bottom, a force sensor e, an upper metal plate c, and a lower soft pad d. The lower soft pad d, made of rubber, is fixedly connected to the bottom end of the upper metal plate c and is glued to the upper surface of the transformer 1. The force sensor e is fixedly connected to the top end of the upper metal plate c. The upper metal plate c provides a rigid connection. The force sensor e is existing technology and will not be elaborated further here; it can measure the magnitude of downward pressure or upward tension.

[0068] In this invention, in order to ensure that the driving force of the hydraulic cylinder 11 acts on the three connecting plates simultaneously, the length of the traction rope 14 and the downward pressing angle of the lever 12 need to be preset. The lower soft pad d is also retractable and used to play a role in distance compensation, which can reduce the difficulty of preset.

[0069] In this invention, the lower soft pad d at the bottom of the connector can absorb and reduce the transmission of vibration, further reducing vibration. The force sensor e obtains the magnitude of the downward pressure and upward pull. In this invention, the first connector 5 and the third connector 7 are both directly driven by the hydraulic cylinder 11, which can adjust the torque and distribution of vibration suppression according to the actual vibration value of the high vibration zone 4.

[0070] Specifically, the third connector 7 is arranged in a ring-shaped dot pattern on the outside of the first connector 5, and the second connector 6 is arranged in a ring-shaped dot pattern on the outside of the third connector 7, with the second connector 6 and the third connector 7 being staggered. The dot-shaped distribution and staggered design of the second connector 6 and the third connector 7 can provide a more comprehensive suppression angle.

[0071] Specifically, a through-type connecting post 211 is fixedly connected to the inner side of the connecting ring 21, with its two ends fixedly connected to the upper surface of the transformer 1 and the bottom end of the conical shell 2, respectively. The connecting post 211 serves as a reinforcing rib, which will not be elaborated further here.

[0072] Specifically, the upper metal plate c in the second connector 6 is slidably connected to the surface of the support plate 13 through a limiting groove. This connection method can ensure the verticality of the downward pressure. In order to avoid jamming, the support plate 13 and the limiting groove can also be provided on the other side of the upper metal plate c in the second connector 6.

[0073] Specifically, spacers 22 are evenly fixedly connected to the inner side of the conical shell 2, and a reflective groove 23 is formed between adjacent spacers 22. Insulating oil can be filled into the conical shell 2 to absorb energy and play a role in noise reduction and sound absorption.

[0074] In the above configuration, the conical shape of the conical shell 2, the liquid insulating oil, and the spacer 22 are all designed to absorb vibration and reduce noise.

[0075] The present invention also discloses a vibration and noise control method for power transformers in power plants, the steps of which are as follows:

[0076] Step 1: Installation, at least one vibration absorber is installed on the upper side of any one of the core columns 3 and on the surface of the transformer 1;

[0077] Step 2: Adjust the limiting force, change the pushing force of the hydraulic cylinder 11, and adjust the position of the slider 1212 within the pressure plate 121 to adjust the limiting force in the high vibration zone 4;

[0078] Step 3: In the same high vibration zone 4, the first connector 5 and the second connector 6 exert downward pressure on the upper surface of the transformer 1 to form a downward pressure surface 41, and the third connector 7 between the first connector 5 and the second connector 6 exerts upward tension on the upper surface of the transformer 1 to form an upward tension surface 42. Thus, the vibration of the transformer 1 is suppressed by repeatedly limiting the upper and lower parts in the high vibration zone 4.

[0079] Example 2 is a further improvement upon Example 1. Please refer to Example 1. Figure 1-12 A lead screw 1213 is rotatably connected to the inner side of the pressure plate 121. A motor 1211 is fixedly connected to one side of the pressure plate 121. The output end of the motor 1211 is fixedly connected to one end of the lead screw 1213. A slider 1212 is slidably connected to the inner side of the pressure plate 121. The inner side of the slider 1212 is helically connected to the inner side of the lead screw 1213. When the motor 1211 rotates, the lead screw 1213 can drive the slider 1212 to move. The slider 1212 then drives the rubber wheel 1214 to slide on the upper surface of the second connecting member 6. The rubber wheel 1214 is compressible.

[0080] When lever 12 is under force, pressure plate 121 will tilt. The gap between pressure plate 121 and second connecting member 6 is changing. Therefore, when rubber wheel 1214 slides, the downward pressure applied by second connecting member 6 to the upper surface of transformer 1 will change as the gap increases or decreases, thereby achieving control of clamping force.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vibration noise control system for power transformers of power plants, comprising a transformer (1) and its core column (3) connected internally by structural elements, characterized in that: Vibration absorbers are installed on the upper side of at least one core post (3) and on the surface of the transformer (1); The vibration absorber includes a conical shell (2) and a connecting ring (21). The connecting ring (21) is fixedly connected to the bottom end of the conical shell (2). The bottom end of the connecting ring (21) is fixedly connected to the upper surface of the transformer (1). The connecting ring (21) is made of rubber. A hydraulic cylinder (11) is provided on the inner side of the cone shell (2). A first connecting piece (5) is fixedly connected to the bottom end of the hydraulic cylinder (11). A lifting plate (10) is fixedly connected to the top end of the hydraulic cylinder (11). Multiple traction ropes (14) are fixedly connected to the bottom end of the outer edge of the lifting plate (10). A third connecting piece (7) is fixedly connected between the bottom end of the traction rope (14) and the upper surface of the transformer (1). A support plate (13) is fixedly connected to the outer side of the third connector (7) and the upper surface of the transformer (1). A lever (12) is rotatably connected to the top of the support plate (13) via a rotating shaft. The upper side of the lever (12) slides in the groove (101) opened on the inner side of the outer edge of the lifting plate (10). A pressure plate (121) is fixedly connected to the bottom end of the lever (12). A rubber wheel (1214) is slidably connected to the inner side of the bottom end of the pressure plate (121). A second connector (6) is provided between the rubber wheel (1214) and the upper surface of the transformer (1).

2. The vibration noise control system for power plant electrical transformers of claim 1, wherein: When the hydraulic cylinder (11) extends, in the same high vibration zone (4), the first connecting piece (5) and the second connecting piece (6) exert downward pressure on the upper surface of the transformer (1) to form a downward pressure surface (41), and the third connecting piece (7) between the first connecting piece (5) and the second connecting piece (6) exerts upward pulling force on the upper surface of the transformer (1) to form an upward pulling surface (42), thereby suppressing the vibration of the transformer (1) by repeatedly limiting the upper and lower parts in the high vibration zone (4).

3. A vibration noise control system for power transformers of power plants according to claim 1 or 2, characterized in that: The hydraulic cylinder (11) includes a mother cylinder (111) on the upper side. A piston (112) is slidably connected to the inner side of the mother cylinder (111). A push rod (113) is fixedly connected to the bottom end of the piston (112). The push rod (113) is fixedly connected to the top end of the first connecting piece (5). The mother cylinder (111) is fixedly connected to the bottom end of the lifting plate (10). A soft oil pipe (9) is connected to the inner side of the top end of the mother cylinder (111). The soft oil pipe (9) passes through the lifting plate (10) and is connected to the output end of the oil pump (8). The oil pump (8) has its own oil storage chamber and is fixed on the top upper side of the cone shell (2).

4. The vibration noise control system for power plant power transformers of claim 1 or 2, characterized by: The first connector (5), the second connector (6) and the third connector (7) each include a force sensor (e), an upper metal plate (c) and a lower soft pad (d) from top to bottom. The lower soft pad (d) is fixedly connected to the bottom end of the upper metal plate (c). The lower soft pad (d) is made of rubber. The lower soft pad (d) is fixedly connected to the upper surface of the transformer (1) by adhesive. The force sensor (e) is fixedly connected to the top end of the upper metal plate (c).

5. The vibration and noise control system for power transformers in power plants according to claim 4, characterized in that: The third connector (7) is distributed in a ring-shaped pattern on the outside of the first connector (5), and the second connector (6) is distributed in a ring-shaped pattern on the outside of the third connector (7). The second connector (6) and the third connector (7) are staggered from each other.

6. The vibration and noise control system for power transformers in power plants according to claim 1 or 2, characterized in that: The inner side of the connecting ring (21) is fixedly connected to a connecting column (211) that runs vertically through it. The two ends of the connecting column (211) are fixedly connected to the upper surface of the transformer (1) and the bottom end of the cone shell (2), respectively.

7. The vibration and noise control system for power transformers in power plants according to claim 4, characterized in that: The upper metal plate (c) in the second connector (6) is slidably connected to the surface of the support plate (13) through a limiting groove.

8. The vibration and noise control system for power transformers in power plants according to claim 7, characterized in that: A lead screw (1213) is rotatably connected to the inner side of the pressure plate (121), and a motor (1211) is fixedly connected to one side of the pressure plate (121). The output end of the motor (1211) is fixedly connected to one end of the lead screw (1213). A slider (1212) is slidably connected to the inner side of the pressure plate (121). The inner side of the slider (1212) is helically connected to the inner side of the lead screw (1213). When the motor (1211) rotates, the lead screw (1213) can drive the slider (1212) to move. The slider (1212) then drives the rubber wheel (1214) to slide on the upper surface of the second connecting member (6). The rubber wheel (1214) is compressible. When the position of the rubber wheel (1214) slides, the downward pressure applied by the second connecting member (6) to the upper surface of the transformer (1) will change, thereby realizing the control of the clamping force.

9. The vibration and noise control system for power transformers in power plants according to claim 1, characterized in that: The inner side of the cone shell (2) is uniformly fixed with partitions (22), and there are reflective grooves (23) between adjacent partitions (22). The cone shell (2) can be filled with insulating oil to absorb energy and play a role in noise reduction.

10. A vibration and noise control method for power transformers in power plants, using the vibration and noise control system as described in claim 8, characterized in that, The steps are as follows: Step 1: Installation, at least one vibration absorber is installed on the upper side of any one of the core columns (3) and on the surface of the transformer (1); Step 2: Adjust the limiting force, change the top force of the hydraulic cylinder (11), and adjust the position of the slider (1212) in the pressure plate (121) to achieve the adjustment of the limiting force in the high vibration zone (4); Step 3: In the same high vibration zone (4), the first connector (5) and the second connector (6) exert downward pressure on the upper surface of the transformer (1) to form a downward pressure surface (41), and the third connector (7) between the first connector (5) and the second connector (6) exerts upward tension on the upper surface of the transformer (1) to form an upward tension surface (42), thereby suppressing the vibration of the transformer (1) by repeatedly limiting the upper and lower parts in the high vibration zone (4).

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