A vibration reduction and noise reduction device for a steam turbine in a power plant

Abstract

A vibration reduction and noise reduction device for a power plant steam turbine disclosed by the present invention includes a steam turbine, which is fixedly installed on the upper side end face of a steam turbine bottom plate. A bottom plate is arranged on the lower side of the steam turbine bottom plate, and the bottom plate and the steam turbine bottom plate are fixedly supported by stacking columns. A buffer pad is arranged between the stacking columns and the bottom plate. A shock absorption module is fixedly arranged on the steam turbine bottom plate through a connecting frame. Openings are arranged in an array on the shock absorption module, and damping bodies are installed in the openings. The damping bodies are connected to the inner walls of the openings through connecting bands. A noise reduction module is arranged on the outer side of the shock absorption module, and the lower end of the noise reduction module is connected to the upper side end face of the bottom plate. The purpose of this design is to design a device that can reduce the vibration transmission between the steam turbine device and the surrounding ground and reduce the noise propagation during the operation of the steam turbine, so as to greatly improve the working environment quality of the surrounding staff.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbine vibration reduction and noise reduction, and specifically relates to a vibration reduction and noise reduction device for a power plant steam turbine. Background Technique

[0002] A steam turbine is an external combustion rotary machine that can convert steam thermal energy into mechanical work. After the steam from the boiler enters the steam turbine, it successively passes through a series of annularly arranged nozzles and moving blades, converting the thermal energy of the steam into the mechanical energy of the rotation of the steam turbine rotor. In the steam turbine, the steam undergoes energy conversion in different ways, thus constituting steam turbines with different working principles. Compared with a reciprocating steam engine, the steam flow in a steam turbine is continuous and high-speed, and the flow rate that can pass through per unit area is large, so a relatively large power can be generated. High-power steam turbines can use higher steam pressures and temperatures, so the thermal efficiency is relatively high. Since the 19th century, the development of steam turbines has been to continuously increase the unit power and improve the thermal economy of the device on the basis of continuously improving safety reliability, durability, and ensuring convenient operation.

[0003] However, due to reasons such as the machining accuracy of parts, installation accuracy, and running wear, a large amount of vibration will be generated during the operation of the steam turbine. At the same time, a large amount of noise is also generated along with the vibration of the device. In the prior art, to reduce the vibration transmission between the steam turbine device and the surrounding ground, elastic pads are mainly added, and the vibration transmission is reduced through the deformation of the elastic pads. However, the deformation amplitude of the elastic pads is small, so the shock absorption effect is limited. In terms of noise reduction, only the noise transmission is reduced by isolating the machine room from the external space. Therefore, if a device can be designed to reduce the vibration transmission between the steam turbine device and the surrounding ground and reduce the noise propagation during the operation of the steam turbine, the working environment quality of the surrounding staff can be greatly improved. Summary of the Invention

[0004] To solve the above problems, in this example, a vibration reduction and noise reduction device for a power plant steam turbine is designed. The steam turbine vibration reduction and noise reduction device includes a steam turbine, the steam turbine is fixedly installed on the upper side end surface of a steam turbine bottom plate, a bottom plate is arranged on the lower side of the steam turbine bottom plate, the bottom plate and the steam turbine bottom plate are fixedly supported by stacking columns, a buffer pad is arranged between the stacking columns and the bottom plate, the cross-sectional area of the stacking columns is significantly smaller than that of the bottom plate and the stacking columns, and the stacking columns and the buffer pad are used to reduce the vibration transmission between the bottom plate and the steam turbine bottom plate. As needed, the number of the stacking columns and the thickness of the buffer pad are adjusted according to the overall weight of the steam turbine and the vibration condition of the steam turbine;

[0005] A shock absorption module is fixedly arranged on the steam turbine base plate through a connecting frame. Openings are arranged in an array on the shock absorption module, and damping bodies are installed in the openings. The damping bodies are connected to the inner walls of the openings through connecting bands. A noise reduction module is arranged on the outer side of the shock absorption module. The lower end of the noise reduction module is connected to the upper side end face of the base plate. A gyro shock absorption component is arranged on the inner side of the lower end of the noise reduction module. The gyro shock absorption component and the damping bodies are used to jointly balance the vibration transmitted from the steam turbine to the steam turbine base plate and then to the connecting frame. Specifically, the gyroscope shock absorption component and the steam turbine base plate are respectively used to balance the large-amplitude vibration and small-amplitude unbalanced oscillation transmitted from the steam turbine to the steam turbine base plate. As required, the number of the damping bodies arranged on the shock absorption module can be adjusted, and the large-amplitude irregular vibration generated by the steam turbine base plate is balanced by the inertia of the damping bodies and the deformation of the openings, and the large-amplitude irregular vibration generated by the steam turbine base plate is reduced. On the same axial side, the number of the gyro shock absorption components can be adjusted as required, and the gyro shock absorption components are used to balance the regular vibration on the steam turbine base plate;

[0006] A noise reduction and sound insulation layer is fixedly arranged on the inner side surface of the noise reduction module. A reflection carrier is fixedly arranged on the noise reduction and sound insulation layer and is installed at a 45-degree inclination angle. The noise reduction and sound insulation layer is used to isolate the noise in the inner space of the noise reduction module from being transmitted to the outside of the noise reduction module. The reflection carrier is used to reflect and change the direction of the noise in the inner space of the noise reduction module.

[0007] Preferably: The damping bodies are made of iron metal, and the connecting bands are made of elastic plastic tapes. As required, the damping bodies can be replaced with copper metal or lead with a larger density to balance larger-amplitude vibrations, or replaced with aluminum metal with a smaller density to reduce the overall weight of the shock absorption module.

[0008] Preferably: The shock absorption module is composed of a flat part at the lower end and an arc part connecting the upper parts of the flat parts on both sides. The overall arched shape of the shock absorption module is formed by the flat part and the arc part, and the openings are arranged at the flat part positions and the arc part positions on both sides of the shock absorption module. This can be used to reduce the vibration of the shock absorption module in the left-right and up-down directions. As required, flat parts can be added to the front and rear ends of the shock absorption module to close the openings at the front and rear ends of the shock absorption module, and damping bodies are arranged on the flat parts at the front and rear ends of the shock absorption module to reduce the vibration of the steam turbine base plate in the front-rear direction.

[0009] Preferably: The noise reduction module is composed of flat parts on the front, rear, left, and right sides and an arc part connecting the upper ends of the flat parts on the front, rear, left, and right sides. The noise reduction and sound insulation layer is fixedly arranged on the end faces of the flat parts and the arc part close to the steam turbine side.

[0010] Preferably, the gyroscopic damping assembly includes a support plate fixedly arranged between the inner wall of the noise reduction module near the lower end face and the upper end face of the bottom plate, and a rotating shaft is penetrated and rotatably arranged in the support plate;

[0011] A bracket is arranged in the space area between the support plates. A rotating groove penetrating left and right is arranged in the bracket. A turntable is rotatably arranged between the upper and lower inner walls of the rotating groove. The turntable is supported between the upper and lower inner walls of the rotating groove through the rotating shaft and is rotationally connected with the upper and lower inner walls of the rotating groove. A power driver is connected to the rotating shaft of the turntable. The front and rear ends of the bracket are respectively connected with a support frame. One end of the support frame away from the connecting frame is rotationally connected with the front and rear ends of the bracket. One end of the support frame close to the connecting frame is connected with the lower bracket, and the middle part of the support frame is fixedly connected with the rotating shaft.

[0012] Preferably, in order to drive the turntable to rotate so as to make the connecting frame generate a gyroscopic effect and balance the regular small-amplitude vibration generated by the steam turbine bottom plate, the power driver is connected to the lower end of the rotating shaft end of the turntable, and the power driver is a driving motor fixedly arranged in the lower inner wall of the rotating groove.

[0013] Preferably, the connecting frame includes a support connecting carrier plate fixedly connected to the upper side surfaces of the left and right ends of the steam turbine bottom plate. The damping module is fixedly connected to the upper end surface of the support connecting carrier plate. The lower bracket is fixedly connected to the lower end surface of the support connecting carrier plate. The support connecting carrier plate and the steam turbine bottom plate are fixedly connected through a bolt assembly. The noise reduction device can be disassembled or drilled and installed on the original steam turbine foundation according to needs, which is convenient for operation.

[0014] Preferably, in order to reduce the rigid vibration generated between the rotating shaft and the lower bracket through the support frame during vibration, a plastic body connecting block is fixedly arranged on one side of the lower bracket close to the turntable. One end of the support frame close to the steam turbine bottom plate is rotationally connected with the plastic body connecting block. The deformable property of the plastic body connecting block can reduce the rigid oscillation generated between the connecting frame and the rotating shaft.

[0015] The beneficial effects of the present invention compared with the prior art: The vibration generated when the steam turbine is running is reduced from being transmitted to the ground, which causes vibration around the steam turbine, improving the working environment quality. Secondly, by damping the regular vibration and irregular vibration of the steam turbine respectively, it is targeted, reducing the balancing difficulty, and the assembly of each component is convenient. It only needs to be installed on the original steam turbine device, improving the construction efficiency. Description of the Drawings

[0016] For ease of explanation, the present invention will be described in detail by the following specific embodiments and the accompanying drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of a vibration reduction and noise reduction device for a power plant steam turbine according to the present invention;

[0018] Figure 2 For Figure 1 an enlarged schematic diagram of part "A" in

[0019] Figure 3 It is a schematic diagram of the structure of the gyro balance assembly in the top view direction;

[0020] Figure 4 For Figure 1 an enlarged schematic diagram of part "B" in

[0021] Figure 5 It is a schematic diagram of the structure of the damping body. Specific embodiments

[0022] The following will Figures 1 to 5 be combined with Figure 1 to describe the present invention in detail. For the convenience of narration, the directions mentioned below are defined as follows: The up, down, left, right, front, and back directions mentioned below are consistent with the up, down, left, right, front, and back directions of the projection relationship of

[0023] itself. The present invention relates to a vibration reduction and noise reduction device for a power plant steam turbine. The following will further describe the present invention in conjunction with the drawings of the present invention:

[0024] A vibration reduction and noise reduction device for a power plant steam turbine according to the present invention, referring to Figure 1 - Figure 5 shown, the steam turbine vibration reduction and noise reduction device includes a steam turbine 105, the steam turbine 105 is fixedly installed on the upper side end face of a steam turbine bottom plate 104, a bottom plate 101 is arranged on the lower side of the steam turbine bottom plate 104, the bottom plate 101 and the steam turbine bottom plate 104 are fixedly supported by a stack column 102, a cushion 103 is arranged between the stack column 102 and the bottom plate 101, the cross-sectional area of the stack column 102 is significantly smaller than that of the bottom plate 101 and the stack column 102, and the stack column 102 and the cushion 103 are used to reduce the vibration transmission between the bottom plate 101 and the steam turbine bottom plate 104. As required, the number of the stack columns 102 and the thickness of the cushion 103 are adjusted according to the overall weight of the steam turbine 105 and the vibration condition of the steam turbine 105;

[0025] A shock absorption module 114 is fixedly arranged on the steam turbine bottom plate 104 through a connecting frame. Openings 115 are arranged in an array on the shock absorption module 114. A damping body 116 is installed in the openings 115. The damping body 116 is connected to the inner wall of the opening 115 through a connecting belt 151. A noise reduction module 111 is arranged on the outer side of the shock absorption module 114. The lower end of the noise reduction module 111 is connected to the upper side end face of the bottom plate 101. A gyroscopic shock absorption component is arranged on the inner side of the lower end of the noise reduction module 111. The gyroscopic shock absorption component and the damping body 116 are used to jointly balance the vibration transmitted from the steam turbine 105 to the steam turbine bottom plate 104 and then to the connecting frame. Specifically, the gyroscopic shock absorption component and the steam turbine bottom plate 104 are respectively used to balance the large-amplitude vibration and small-amplitude unbalanced oscillation transmitted from the steam turbine 105 to the steam turbine bottom plate 104. As needed, the number of the damping bodies 116 arranged on the shock absorption module 114 can be adjusted, and the inertia of the damping body 116 and the deformation of the opening 115 are used to balance the large-amplitude irregular vibration generated by the steam turbine bottom plate 104 and reduce the large-amplitude irregular vibration generated by the steam turbine bottom plate 104. On the same axial direction, the number of the gyroscopic shock absorption components can be adjusted as needed. The gyroscopic shock absorption component is used to balance the regular vibration on the steam turbine bottom plate 104;

[0026] A noise reduction and sound insulation layer 112 is fixedly arranged on the inner side surface of the noise reduction module 111. A reflection carrier 113 is fixedly arranged on the noise reduction and sound insulation layer 112 and is installed at a 45-degree inclination angle. The noise reduction and sound insulation layer 112 is used to isolate the noise in the inner space of the noise reduction module 111 from being transmitted to the outside of the noise reduction module 111. The reflection carrier 113 is used to reflect and change the direction of the noise in the inner space of the noise reduction module 111.

[0027] Advantageously, the damping body 116 is made of iron metal, and the connecting belt 151 is made of an elastic plastic belt. As needed, the damping body 116 can be replaced with copper metal or lead with a greater density to balance a larger amplitude of vibration, or replaced with aluminum metal with a smaller density to reduce the overall weight of the shock absorption module 114.

[0028] As shown in the appendix Figure 1As shown, the shock absorption module 114 is composed of a flat plate part at the lower end and an arc part connecting the upper ends of the flat plates on both sides. The overall arch shape of the shock absorption module 114 is formed by the flat plate part and the arc part. The opening 115 is provided at the flat plate positions and the arc part positions on both sides of the shock absorption module 114, so as to be used to reduce the vibration of the shock absorption module 114 in the left - right and up - down directions. As needed, flat plate parts can be added to the front and rear ends of the shock absorption module 114 to close the openings at the front and rear ends of the shock absorption module 114, and damping bodies 116 are provided on the flat plate parts at the front and rear ends of the shock absorption module 114 to reduce the vibration of the steam turbine bottom plate 104 in the front - rear direction.

[0029] As shown in the attached Figure 1 figure, the noise reduction module 111 is composed of flat plate parts on the front - rear and left - right sides and an arc part connecting the upper ends of the flat plate parts on the front - rear and left - right sides. The noise reduction and sound insulation layer 112 is fixedly arranged on the end faces of the flat plate parts and the arc part close to the side of the steam turbine 105.

[0030] Beneficially, as shown in the attached Figure 1 figure to Figure 3 figure of the gyro shock absorption assembly, the gyro shock absorption assembly includes a support plate 106 fixedly arranged between the inner wall of the lower - side end face of the noise reduction module 111 and the upper - side end face of the bottom plate 101. A rotating shaft 123 is penetrated and rotatably arranged in the support plate 106;

[0031] A bracket 133 is arranged in the space area between the support plates 106. A rotating groove 142 is arranged through the left - right direction in the bracket 133. A turntable 122 is rotatably arranged between the upper and lower inner walls of the rotating groove 142. The turntable 122 is supported by a rotating shaft between the upper and lower inner walls of the rotating groove 142 and is rotatably connected with the upper and lower inner walls of the rotating groove 142. A power driver is connected to the rotating shaft of the turntable 122. The front and rear ends of the bracket 133 are respectively connected with support frames 143. One end of the support frame 143 away from the connecting frame is rotatably connected with the front and rear ends of the bracket 133. One end of the support frame 143 close to the connecting frame is connected with the lower bracket 141, and the middle part of the support frame 143 is fixedly connected with the rotating shaft 123.

[0032] Beneficially, as shown in the attached Figures 1 - 3 figure, in order to drive the turntable 122 to rotate so as to make the connecting frame generate a gyroscopic effect and balance the regular small - amplitude vibration generated by the steam turbine bottom plate 104, the power driver is connected to the lower end of the rotating shaft end of the turntable 122, and the power driver is a driving motor 134 fixedly arranged in the lower - side inner wall of the rotating groove 142.

[0033] Beneficial, as shown in the appended Figure 1 to the appended Figure 3 As shown in the connection bracket, the connection bracket includes a support connection carrier plate 126 fixedly connected to the upper side surfaces of the left and right ends of the steam turbine bottom plate 104. The shock absorption module 114 is fixedly connected to the upper side end surface of the support connection carrier plate 126. The lower bracket 141 is fixedly connected to the lower side end surface of the support connection carrier plate 126. The support connection carrier plate 126 and the steam turbine bottom plate 104 are fixedly connected by a bolt assembly 128. The noise reduction device can be disassembled or drilled and installed on the original steam turbine foundation according to needs, which is convenient for operation.

[0034] Furthermore, in order to reduce the rigid vibration generated between the rotating shaft 123 and the lower bracket 141 through the support frame 143 during vibration, a plastic body connection block 131 is fixedly arranged on one side of the lower bracket 141 close to the turntable 122. One end of the support frame 143 close to the steam turbine bottom plate 104 is rotatably connected to the plastic body connection block 131. The deformable property of the plastic body connection block 131 can reduce the generation of rigid oscillation between the connection bracket and the rotating shaft 123.

[0035] As shown in the appended Figure 1 As shown, between the air inlet and outlet of the steam turbine 105 and the shock absorption module 114, vibration damping and buffering are carried out through a buffer cotton 117.

[0036] The specific working principle of this steam turbine vibration damping and noise reduction device is as follows:

[0037] The main reasons for vibration and noise generated during the operation of the steam turbine mainly include: 1: Poor drainage and uneven expansion during unit startup. 2: Thermal bending of the rotor and oil film oscillation during startup.

[0038] 3: Changes in main and reheat steam temperatures, pressures, vacuums, oil temperatures, and oil pressures during operation. 4: Water hammer or blade loss occurs. 5: Changes in load and governor valve opening, differential expansion, and shaft string changes. 6: Operating conditions of the generator and exciter. 7: Unbalance of rotor mass. 8: Too high or too low oil temperature, unstable bearing oil film. 9: Improper rotor center. 10: Uneven radial clearance between the rotor and the cylinder, generating exciting force. 11: Dynamic and static wear during operation. 12: Weakening of the stiffness of the rotor support system. 13: The rotor falls into the resonance zone and vibrates violently. 14: Disturbing force caused by electromagnetic principle. 15: Uneven expansion, unstable thermal expansion of components.

[0039] According to the above reasons for vibration generation, it can be classified into regular vibration, irregular vibration, large-amplitude vibration, and small-amplitude vibration;

[0040] Accordingly, the steam turbine base plate 104 is connected to the shock absorption module 114 through the connecting frame. Therefore, when the steam turbine 105 transmits vibration to the steam turbine base plate 104, the steam turbine base plate 104 transmits the vibration to the shock absorption module 114 rigidly connected thereto, (thereby reducing the vibration energy transmitted from the steam turbine base plate 104 to the base plate 101). When the shock absorption module 114 vibrates synchronously with the steam turbine base plate 104, due to the inertia of the damping body 116, the connecting belt 151 deforms to consume the energy during the vibration of the shock absorption module 114, and further consumes the irregular vibration of the shock absorption module 114 through the damping effect generated by the damping body 116 itself, thereby reducing the irregular vibration of the steam turbine base plate 104;

[0041] Meanwhile, the drive motor 134 starts and drives the turntable 122 to rotate at a high speed. During the rotation, part of the regular vibration generated when the shaft of the steam turbine 105 rotates is balanced through the gyroscopic effect of the turntable 122;

[0042] The vibration transmission between the steam turbine base plate 104 and the base plate 101 can be further reduced through the stacked columns 102, so that most of the vibration energy of the steam turbine base plate 104 is transmitted to the shock absorption module 114 through the connecting frame (eliminated through the damping effect of the damping body 116 and the deformation effect of the connecting belt 151) and the lower support 141 (the regular vibration is eliminated through the gyroscopic effect). Even if part of the vibration is transmitted, through the deformation of the cushion 103 during vibration, the energy transmitted to the ground is small, achieving a good vibration reduction effect;

[0043] By reducing the vibration and isolating the internal and external spaces through the noise reduction module 111, the transmission of noise can be reduced. Through the isolation of the noise reduction and sound insulation layer 112 and the reflection of noise by the reflection carrier 113, the energy loss of noise during transmission can be increased, thereby reducing the noise.

[0044] In the above manner, those skilled in the art can make various changes within the scope of the present invention according to the working mode.

Claims

1. A vibration and noise reduction device for a power plant steam turbine, comprising a steam turbine, which is fixedly installed on the upper end face of a steam turbine base plate. It is characterized in that: A base plate is arranged on the lower side of the steam turbine base plate, and the base plate and the steam turbine base plate are fixedly supported by stacking columns. A buffer pad is arranged between the stacking columns and the base plate. A shock absorption module is fixedly arranged on the steam turbine base plate through a connecting frame. Openings are arranged in an array on the shock absorption module, and damping bodies are installed in the openings. The damping bodies are connected to the inner walls of the openings through connecting bands. A noise reduction module is arranged on the outer side of the shock absorption module. The lower end of the noise reduction module is connected to the upper end face of the base plate. A gyroscopic vibration reduction component is arranged on the inner side of the lower end of the noise reduction module. The gyroscopic vibration reduction component and the damping body are used to jointly balance the vibration transmitted from the steam turbine to the steam turbine base plate and then to the connecting frame. A noise reduction and sound insulation layer is fixedly arranged on the inner side surface of the noise reduction module. A reflection carrier installed at a 45-degree inclination angle is fixedly arranged on the noise reduction and sound insulation layer. The noise reduction and sound insulation layer is used to isolate the noise in the inner space of the noise reduction module from being transmitted to the outside of the noise reduction module. The reflection carrier is used to reflect and change the direction of the noise in the inner space of the noise reduction module. The connecting frame includes support connecting carrier plates fixedly connected to the upper side surfaces of the left and right ends of the steam turbine base plate. The shock absorption module is fixedly connected to the upper end face of the support connecting carrier plate. A lower support is fixedly connected to the lower end face of the support connecting carrier plate. The support connecting carrier plate and the steam turbine base plate are fixedly connected through bolt assemblies. The gyroscopic vibration reduction component includes a support plate fixedly arranged between the inner side wall of the noise reduction module near the lower end face and the upper end face of the base plate. A rotating shaft is arranged through and rotatably in the support plate. A support is arranged in the space area between the support plates. A rotating groove penetrating left and right is arranged in the support. A turntable is rotatably arranged between the upper and lower inner walls of the rotating groove. A power driver is connected to the rotating shaft end of the turntable. Support frames are respectively connected to the front and rear ends of the support. One end of the support frame far from the connecting frame is rotatably connected to the front and rear ends of the support. One end of the support frame close to the connecting frame is connected to the lower support, and the middle part of the support frame is fixedly connected to the rotating shaft.

2. A vibration and noise reduction device for a power plant steam turbine according to claim 1, It is characterized in that: The damping body is made of iron metal, and the connecting band is made of an elastic plastic tape.

3. A vibration and noise reduction device for a power plant steam turbine according to claim 1, It is characterized in that: In order to drive the turntable to rotate so that the connecting frame generates a gyroscopic effect to balance the regular small-amplitude vibration generated by the steam turbine base plate, the power driver is connected to the lower end of the rotating shaft end of the turntable, and the power driver is a driving motor fixedly arranged in the lower inner wall of the rotating groove.

4. A vibration and noise reduction device for a power plant steam turbine according to claim 1, It is characterized in that: To reduce the rigid vibration generated between the rotating shaft and the lower bracket through the support frame during vibration, a plastic body connecting block is fixedly arranged on the side of the lower bracket close to the turntable, and the end of the support frame close to the steam turbine bottom plate is rotatably connected to the plastic body connecting block. The deformable property of the plastic body connecting block can reduce the generation of rigid oscillation between the connecting frame and the rotating shaft.

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