Spring vibration isolation bearing foundation structure applied to 300mw level compressed air energy storage power station
By introducing multi-level adjustable spring vibration isolation supports and an online monitoring system into the foundation structure of the compressed air energy storage power station, the problem of insufficient vibration isolation performance of traditional foundations has been solved, vibration isolation and real-time monitoring have been achieved, the stability and safety of the unit have been improved, and maintenance costs have been reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CENT SOUTHERN CHINA ELECTRIC POWER DESIGN INST CHINA POWER ENG CONSULTING GROUP CORP
- Filing Date
- 2025-07-30
- Publication Date
- 2026-07-14
AI Technical Summary
The high-speed rotating mechanical vibration of a 300MW compressed air energy storage power station is large and the frequency is concentrated. The vibration isolation performance of traditional rigid foundations is insufficient, and it is difficult to achieve adjustable natural frequency and online monitoring, resulting in unstable unit operation and poor safety.
The system employs multi-stage adjustable spring vibration isolation supports arranged between the foundation platform and the columns. By designing the overall first-order natural frequency to be staggered from the main disturbance frequency of the unit, and combining a series-parallel hybrid spring and a dual-stage damping design, it is equipped with a settlement adjustment trough and an online monitoring system to achieve vibration isolation and real-time monitoring.
It significantly reduces vibration acceleration and noise, improves the stability and safety of unit operation, extends support life, reduces unplanned downtime and maintenance costs, and meets the high safety and economic requirements throughout the entire life cycle.
Smart Images
Figure CN224495230U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the fields of vibration control and power foundation technology, specifically relating to a spring vibration isolation support foundation structure for a 300MW compressed air energy storage power station. Background Technology
[0002] Compressed air energy storage (CAES) power plants, due to their dual operating modes of power generation and compression, require the installation of turbine generator sets, compressor sets, and corresponding auxiliary equipment within the machine room. These high-speed rotating machines typically possess the following characteristics:
[0003] 1. High power and speed: When the output power of the 300MW CAES unit is at full load, the compressor and turbine speed can reach more than 3000r / min; the corresponding main disturbance frequency (f) is usually in the range of 25-60Hz.
[0004] 2. Large excitation force and concentrated frequency: The periodic excitation force generated by rotor imbalance, aerodynamic excitation and working condition switching is easy to superimpose resonance on the foundation structure.
[0005] 3. Limitations of traditional rigid foundations: ① Fixed natural frequency: It is difficult for the natural frequency of large-volume reinforced concrete foundations to avoid aligning with the main frequency of the unit; ② Poor vibration isolation performance: Ordinary rubber pads creep and age over time, resulting in limited attenuation of low-frequency vibration isolation; ③ Mismatch of secondary grouting: Equipment alignment depends on secondary grouting, making it difficult to re-level during later maintenance; ④ Insufficient monitoring methods: Regular inspections alone cannot detect loose foundations or local settlement in a timely manner.
[0006] Therefore, developing a spring vibration isolation bearing foundation structure with adjustable natural frequency, high damping, easy maintenance, and online monitoring for high-power CAES units has become a problem that needs to be solved. Utility Model Content
[0007] The purpose of this invention is to address the shortcomings of the aforementioned background technology and provide a spring vibration isolation support foundation structure for a 300MW compressed air energy storage power station. Primarily used in a scaled-down model of a 300MW compressed air energy storage power station, it reduces vibration transmission efficiency through elastic support, isolates the dynamic coupling between the equipment and the foundation, reduces structural noise and fatigue damage, thereby significantly improving the stability and safety of large-scale unit operation.
[0008] The technical solution adopted in this utility model is: a spring vibration isolation support foundation structure for a 300MW compressed air energy storage power station. The spring vibration isolation support foundation structure includes a foundation plate, columns, and several spring vibration isolation supports disposed between the foundation plate and the columns. Each spring vibration isolation support is composed of multiple spring units. The first natural frequency of the overall spring vibration isolation support foundation structure is designed to be offset from the main disturbance frequency of the turbine generator set or compressor set. The spring vibration isolation supports are integrally fixed to the bottom of the foundation plate and the top of the columns through connecting pads. The spring vibration isolation supports are evenly distributed along the bottom of the foundation plate at a predetermined position to distribute the equipment load.
[0009] Preferably, the spring vibration isolation support is integrally connected to the bottom of the foundation plate and the top of the column reinforcement steel plate through the upper connecting plate and the lower connecting plate.
[0010] Preferably, the lower connecting pad and the column top reinforcing steel plate are fastened together with M20 high-strength bolts and an epoxy grout layer, ensuring a contact gap of less than 0.02mm.
[0011] Preferably, the lower end of the column is fixed to the elastic base plate, and the elastic base plate adopts a double-layer steel plate sandwiched with a crack-resistant rubber layer structure.
[0012] Preferably, each spring unit includes at least two metal helical springs connected in parallel. The metal helical springs are made of 50CrVA material, with a single spring static stiffness of 6–8 kN / mm and a stroke of 25–35 mm.
[0013] Preferably, the different spring units are connected in series or in parallel to meet different stiffness or natural frequency design requirements.
[0014] Preferably, the spring vibration isolation supports are pre-arranged along the lower part of the foundation platform, and at least one spring vibration isolation support is provided at the base of each column to achieve uniform support for the equipment load and vibration isolation.
[0015] Preferably, a 20mm deep settlement adjustment groove is reserved on the lower surface of the foundation plate, allowing the overall settlement adjustment of the spring vibration isolation support to be no less than ±5mm.
[0016] Preferably, the outer surface of the spring vibration isolation support is coated with a three-layer anti-corrosion layer consisting of thermally sprayed zinc, epoxy micaceous iron oxide primer, and polyurethane topcoat, which meets the C5M level durability requirements.
[0017] Preferably, multiple vibration monitoring sensors are pre-embedded in the foundation plate to collect the displacement signals of the spring vibration isolation support in real time, and communicate with the remote monitoring system through a data acquisition device to achieve online monitoring.
[0018] Compared with the prior art, the beneficial effects of this utility model are:
[0019] This utility model addresses the problems of large and concentrated high-speed rotating mechanical vibrations and insufficient vibration isolation performance of traditional rigid foundations in 300MW compressed air energy storage power stations. It adopts an overall solution of arranging multi-level adjustable spring vibration isolation supports between the foundation platform and the columns, which significantly improves the safety, stability and maintainability of the unit operation.
[0020] This invention utilizes adjustable multi-stage spring vibration isolation supports between the foundation platform and the columns to effectively offset the first-order natural frequency of the foundation from the main disturbance frequency of the generator unit. This results in a measured reduction of over 65% in RMS vibration acceleration and a 4-6 dB(A) reduction in nacelle noise, significantly suppressing bolt loosening and concrete fatigue cracking. The series-parallel hybrid spring and dual-stage damping design broaden the vibration isolation bandwidth, reducing peak response by up to 40% under impact conditions. Settlement adjustment grooves and pre-tightening mechanisms improve installation efficiency and subsequent fine-tuning capabilities, while displacement limiters ensure safety under extreme conditions. The C5M-grade anti-corrosion system and 50CrVA spring material extend the expected lifespan of the supports to over 30 years. The online monitoring platform enables sub-second alarms and two-week advance fault prediction, comprehensively reducing unplanned downtime and maintenance costs by over 20%. Overall, this invention outperforms existing rigid or rubber vibration isolation foundations in terms of vibration isolation performance, reliability, maintainability, and environmental adaptability, meeting the high safety and economic requirements of a 300MW compressed air energy storage power station throughout its entire lifecycle. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the foundation structure of the spring vibration isolation support of this utility model;
[0022] Figure 2 This is a schematic diagram of the structure of the spring vibration isolation support of this utility model.
[0023] In the figure, 1-spring vibration isolation support (11-upper connecting pad, 12-lower connecting pad, 13-spring unit), 2-foundation platform, 3-column (31-column top reinforcing steel plate), 4-elastic base plate. Detailed Implementation
[0024] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0025] like Figure 1As shown, the spring vibration isolation support foundation structure of this utility model includes a foundation plate 2, a column 3, and several spring vibration isolation supports 1 disposed between the foundation plate 2 and the column 3; each spring vibration isolation support 1 is composed of multiple spring units 13; the first natural frequency of the overall spring vibration isolation support foundation structure is designed to be offset from the main disturbance frequency of the turbine generator set or compressor set; the spring vibration isolation support 1 is integrally fixed to the bottom of the foundation plate 2 and the top of the column 3 through connecting pads; the spring vibration isolation supports 1 are evenly arranged at a preset position along the bottom of the foundation plate 2 to distribute the equipment load.
[0026] like Figure 2 As shown, the spring vibration isolation support 1 is integrally connected to the bottom of the foundation plate 2 and the top of the column 3 via the upper connecting plate 11 and the lower connecting plate 12. The lower connecting plate 12 and the top of the column 3 are secured with M20 high-strength bolts and an epoxy grouting layer, ensuring a contact gap of less than 0.02mm. The lower end of the column 3 is fixed to the elastic base plate 4, which adopts a double-layer steel plate sandwiched with a crack-resistant rubber layer. The foundation plate 2, the column 3, and the elastic base plate 4 form the foundation of the turbine generator set or compressor set. Each spring unit 13 includes at least two metal helical springs connected in parallel. The metal helical springs are made of 50CrVA material, with a single spring static stiffness of 6–8kN / mm and a stroke of 25–35mm. The spring vibration isolation supports are pre-arranged along the lower part of the foundation plate, and at least one spring vibration isolation support 1 is set at the base of each column to achieve uniform support for the equipment load and vibration isolation. Different spring units 13 are connected in series or in parallel to meet different stiffness or natural frequency design requirements. A 20mm deep settlement adjustment groove is reserved on the lower surface of the foundation plate 2, allowing the overall settlement adjustment of the spring vibration isolation support 1 to be no less than ±5mm. The outer surface of the spring vibration isolation support 1 is coated with a three-layer anti-corrosion layer of hot-spray zinc, epoxy micaceous iron oxide primer and polyurethane topcoat. Multi-point vibration monitoring sensors are embedded in the foundation plate 2 to collect the displacement signal of the spring vibration isolation support 1 in real time. The sensor communicates with the remote monitoring system through a data acquisition device, which can track the support displacement signal in real time, realize sub-second alarm and predictive maintenance, and usually issue an early warning two weeks before the failure, significantly reducing the risk of unplanned downtime.
[0027] Compared with the traditional rigid foundation solution of rubber pads, this utility model not only achieves vibration amplitude attenuation of more than 60% in terms of vibration isolation performance, but also realizes high reliability, easy maintenance and economy of CAES unit throughout its entire life cycle through multiple designs such as adjustable, monitorable, shockproof and corrosion resistant, providing a safe, stable and future-oriented basic solution for high-power energy storage equipment.
[0028] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Contents not described in detail in this specification belong to prior art known to those skilled in the art.
Claims
1. A spring vibration isolation support foundation structure for a 300MW compressed air energy storage power station, characterized in that: The spring vibration isolation support foundation structure includes a foundation plate, columns, and several spring vibration isolation supports disposed between the foundation plate and the columns; each spring vibration isolation support is composed of multiple spring units; the first natural frequency of the entire spring vibration isolation support foundation structure is designed to be offset from the main disturbance frequency of the turbine generator set or compressor set; the spring vibration isolation supports are integrally fixed to the bottom of the foundation plate and the top of the columns by connecting pads; the spring vibration isolation supports are evenly distributed along the bottom of the foundation plate at a predetermined position to distribute the equipment load.
2. The spring vibration isolation support foundation structure for a 300MW compressed air energy storage power station according to claim 1, characterized in that: The spring vibration isolation supports are integrally connected to the bottom of the foundation platform and the top of the column reinforcement steel plate through the upper connecting plate and the lower connecting plate.
3. The spring vibration isolation support foundation structure for a 300MW compressed air energy storage power station according to claim 2, characterized in that: The lower connecting pad and the column top reinforcing steel plate are fastened together with M20 high-strength bolts and an epoxy grouting layer, ensuring a contact gap of less than 0.02mm.
4. The spring vibration isolation support foundation structure for a 300MW compressed air energy storage power station according to claim 1, characterized in that: The lower end of the column is fixed to the elastic base plate, which is a double-layer steel plate sandwiched with a crack-resistant rubber layer.
5. The spring vibration isolation support foundation structure for a 300MW compressed air energy storage power station according to claim 1, characterized in that: Each spring unit comprises at least two metal helical springs connected in parallel. The metal helical springs are made of 50CrVA material, with a single spring static stiffness of 6–8 kN / mm and a stroke of 25–35 mm.
6. The spring vibration isolation support foundation structure for a 300MW compressed air energy storage power station according to claim 5, characterized in that: The different spring units are configured in series or in parallel.
7. The spring vibration isolation support foundation structure for a 300MW compressed air energy storage power station according to claim 1, characterized in that: The spring vibration isolation supports are pre-arranged along the lower part of the foundation slab, and at least one spring vibration isolation support is installed at the base of each column.
8. The spring vibration isolation support foundation structure for a 300MW compressed air energy storage power station according to claim 7, characterized in that: The lower surface of the foundation plate is reserved with a 20mm deep settlement adjustment groove, which allows the overall settlement adjustment of the spring vibration isolation support to be no less than ±5mm.
9. The spring vibration isolation support foundation structure for a 300MW compressed air energy storage power station according to claim 1, characterized in that: The outer surface of the spring vibration isolation support is coated with a three-layer anti-corrosion layer consisting of thermal spray zinc, epoxy micaceous iron oxide primer, and polyurethane topcoat.
10. The spring vibration isolation support foundation structure for a 300MW compressed air energy storage power station according to claim 1, characterized in that: Multiple vibration monitoring sensors are pre-embedded in the foundation plate to collect the displacement signal of the spring vibration isolation support in real time, and communicate with the remote monitoring system through a data acquisition device.