Semi-active inerter based on pressure control

Abstract

The invention discloses a semi-active inerter based on pressure control, and belongs to the technical field of seismic resistance and seismic mitigation and isolation, the semi-active inerter comprises a main body supporting structure, the main body supporting structure is composed of a top plate and a bottom plate, supporting frames are uniformly distributed between the top plate and the bottom plate, and a driving assembly is installed at the center position of the main body supporting structure; the bottom of the driving assembly is connected with the pressure intensity adjusting assembly, the driving assembly comprises a ball screw, the pressure intensity adjusting assembly comprises a flywheel, and the bottom of the ball screw is connected with the flywheel through a connecting flange. Liquid in the flywheel is distributed in the flywheel inner cavity and the flywheel outer cavity, the flywheel inner cavity is installed in the center area of the flywheel and connected to the intelligent pressure regulator, and the inerter coefficient can be adjusted in real time according to external conditions. According to the semi-active inerter based on pressure intensity control, stepless adjustment of the inerter coefficient can be achieved, the problem of abrasion of a mechanical device can be effectively solved, and the manufacturing and maintenance cost of the device is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of earthquake resistance and seismic isolation, and in particular to a semi-active inertia container based on pressure control. Background Art

[0002] Vibration is an issue that cannot be ignored in human daily life and production practice, and its impact is very extensive. Severe vibration will affect the sensitivity and accuracy of precision machining equipment, and even cause failure of components or structures. In addition, vibration will reduce the comfort of the working environment and cause discomfort to personnel. In order to suppress undesirable vibrations, domestic and foreign researchers have proposed a variety of vibration control methods, mainly including passive control, semi-active control, active control and hybrid control. Among them, passive control is widely used because of its simple structure and lack of dependence on external energy input. Common passive control devices include tuned mass dampers (TMD) and viscous liquid dampers (VD). These two types of devices have attracted much attention in the engineering field due to their excellent control effects, but both have certain problems that limit their wide application. Specifically, the control effect of the tuned mass damper is highly dependent on the mass ratio between the additional mass and the main structure, and a large mass ratio is usually required to achieve excellent control effects; viscous liquid dampers have problems such as oil leakage, and their long-term durability is a thorny issue.

[0003] In recent years, inertia chambers have been widely used as a new type of mechanical element to improve and enhance traditional vibration reduction devices. The basic function of an inertia chamber is to convert the relative acceleration between two points into force, forming a complementary relationship with common springs (energy storage elements) and dampers (energy consumption elements). Its unique advantage is that it can provide large inertial mass without significantly increasing the mass of the system. It has been applied to automobile suspension, building shock absorption, bridge seismic resistance and other fields.

[0004] However, most existing inertial vessels belong to the category of passive control and cannot achieve adaptive adjustment according to changes in the external environment and the structure's own dynamic characteristics, posing a potential risk of reduced performance.

[0005] At the same time, existing semi-active inertia devices are mostly implemented by electromagnetic control, variable speed gearboxes, magnetic powder clutches, etc. The device structure is complex, the inertia adjustment range is limited, and the manufacturing and maintenance costs of the device are high. Summary of the invention

[0006] The purpose of the present invention is to provide a semi-active inertia container based on pressure control, which can not only realize stepless adjustment of the inertia coefficient, but also effectively avoid the wear problem of the mechanical device and reduce the manufacturing and maintenance costs of the device.

[0007] To achieve the above-mentioned purpose, the present invention provides a semi-active inertia container based on pressure control, including a main support structure, wherein the main support structure is composed of a top plate and a bottom plate, support frames are evenly distributed between the top plate and the bottom plate, a drive assembly is installed at the center of the main support structure, and a pressure regulating assembly is connected to the bottom of the drive assembly.

[0008] Preferably, the driving assembly includes a ball screw, which vertically penetrates the top plate and the bottom plate and is cooperatively connected with a ball nut.

[0009] Preferably, the top end and the bottom end of the ball screw are fixed to the top plate and the bottom plate through bearing seats.

[0010] Preferably, a washer is provided on the outer side of the ball screw, and both sides of the washer are mounted on the support frame through flange bearing sleeves, and the flange bearing is installed on the support frame through bolts.

[0011] Preferably, the pressure regulating assembly includes a flywheel, the bottom of the ball screw is connected to the flywheel via a connecting flange, and a buffer block is provided between the connecting flange and the gasket.

[0012] Preferably, the flywheel comprises a flywheel inner cavity and a flywheel outer cavity, the flywheel inner cavity is installed in the central area of ​​the flywheel, and the flywheel inner cavity is connected to a pressure intelligent regulator.

[0013] Preferably, the outside of the flywheel inner cavity is connected to the flywheel outer cavity via a double-bottom pipe, and radial partitions are evenly arranged between the flywheel inner cavity and the flywheel outer cavity.

[0014] Preferably, the support frame is fixedly connected to the top plate and the bottom plate by bolts, and a fixing gasket is provided on the inner side of the bottom plate.

[0015] Therefore, the present invention adopts the above-mentioned semi-active inertia container based on pressure control, and promotes the flow of liquid in the flywheel cavity by controlling the pressure inside the flywheel, adjusts the mass distribution of the liquid between the inner cavity and the outer cavity of the flywheel, realizes dynamic adjustment of the moment of inertia, and further realizes stepless adjustment of the inertia coefficient; by adopting the pressure adjustment method (such as inflation and deflation), the internal pressure can be adjusted in real time during the operation of the flywheel, which can effectively avoid mechanical damage problems caused by friction or uneven load of the mechanical device.

[0016] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a semi-active inertia container based on pressure control of the present invention; Figure 2is a front view of an embodiment of a semi-active inertia container based on pressure control of the present invention; Figure 3 It is a schematic diagram of the structure of the flywheel part of an embodiment of a semi-active inertia container based on pressure control of the present invention; Figure 4 is a cross-sectional view of a half-section of a flywheel of an embodiment of a semi-active inertia container based on pressure control of the present invention; Figure 5 It is a schematic diagram of the flow of liquid in the inner and outer cavities of a flywheel according to an embodiment of a semi-active inertia container based on pressure control of the present invention.

[0018] Reference numerals 1. Ball screw; 2. Ball nut; 3. Top plate; 4. Bottom plate; 5. Support frame; 6. Flange bearing; 7. Radial partition; 8. Flywheel inner cavity; 9. Flywheel outer cavity; 10. Flywheel; 11. Pressure intelligent regulator; 12. Double bottom pipe; 13. Fixed gasket; 14. Connecting flange; 15. Washer; 16. Bearing seat; 17. Buffer block. DETAILED DESCRIPTION

[0019] The technical solution of the present invention is further described below through the accompanying drawings and embodiments.

[0020] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. "Include" or "comprises" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0021] Embodiment 1 like Figure 1 , Figure 2 As shown, the present invention provides a semi-active inertia container based on pressure control, including a main support structure, which is composed of a top plate 3 and a bottom plate 4. Support frames 5 are evenly distributed between the top plate 3 and the bottom plate 4. The support frames 5 are fixed by bolts to ensure the rigid connection between the top plate 3 and the bottom plate 4. A fixing gasket 13 is provided on the inner side of the bottom plate 4. The main support structure provides a foundation for installing and fixing the internal components.

[0022] A driving assembly is installed at the center of the main support structure, and the bottom of the driving assembly is connected to the pressure adjustment assembly. The driving assembly includes a ball screw 1, which vertically penetrates the top plate 3 and the bottom plate 4, and is connected with a ball nut 2 to form a main transmission structure. The ball nut 2 is threadedly engaged with the ball screw 1, so that the ball screw 1 drives the pressure adjustment assembly to rotate and provide inertial power. The top and bottom ends of the ball screw 1 are fixed to the top plate 3 and the bottom plate 4 through the bearing seat 16. The bearing seat 16 provides rotation support and reduces friction, while ensuring that the bearing is fixed in a preset position.

[0023] The outer side of the ball screw 1 is equipped with a washer 15, and both sides of the washer 15 are sleeved on the support frame 5 through flange bearings 6, and the flange bearings 6 are installed on the support frame 5 through bolts. The rotation accuracy of the ball screw 1 is guaranteed by the flange bearings 6 to avoid radial deviation.

[0024] The pressure regulating assembly includes a flywheel 10 . The bottom of the ball screw 1 is connected to the flywheel 10 via a connecting flange 14 . A buffer block 17 is provided between the connecting flange 14 and the gasket 15 . The buffer block 17 reduces mechanical impact between the components.

[0025] The rotational motion of the ball screw 1 converts the linear motion into rotational motion through its spiral structure, driving the flywheel 10 to move. When the ball screw 1 rotates, the ball nut 2 moves axially along the ball screw 1, thereby driving the flywheel 10 connected thereto to rotate, providing an inertial force. The rotational angular velocity of the flywheel 10 depends on parameters such as the lead, rotational angular velocity and diameter of the ball screw 1. By adjusting the rotational speed and design parameters of the ball screw 1, the rotational speed of the flywheel 10 can be controlled, thereby affecting the inertial characteristics of the device.

[0026] like Figure 3 , Figure 4 As shown, the flywheel 10 includes a flywheel inner cavity 8 and a flywheel outer cavity 9. The flywheel inner cavity 8 is installed in the central area of ​​the flywheel 10. The top of the flywheel 10 is tightly connected to the bottom of the ball screw 1, so that the flywheel 10 and the ball screw 1 move synchronously. The flywheel inner cavity 8 is connected to the pressure intelligent regulator 11 to adjust the air pressure inside the flywheel 10 in real time. The pressure intelligent regulator 11 controls the pressure of the flywheel inner cavity 8 by inflation and deflation to affect the flow of the liquid.

[0027] When the pressure intelligent regulator 11 increases the pressure, the air pressure in the flywheel inner cavity 8 increases, causing the liquid to flow into the flywheel outer cavity 9 through the double bottom pipe 12. The distribution of the liquid in the flywheel outer cavity 9 changes, and the liquid is concentrated on the outer edge of the flywheel outer cavity 9. As the liquid enters the flywheel outer cavity 9, the inertial mass increases due to the distribution of the liquid at a larger radius, increasing the inertia of the device. Conversely, when the pressure intelligent regulator 11 reduces the air pressure in the flywheel inner cavity 8, the liquid will flow back from the flywheel outer cavity 9 to the flywheel inner cavity 8, and the inertial mass will decrease, such as Figure 5shown.

[0028] Radial baffles 7 are evenly arranged between the flywheel inner cavity 8 and the flywheel outer cavity 9. The radial baffles 7 are designed to effectively control the distribution of liquid in the flywheel outer cavity 9 and the double bottom pipe 12, ensure the uniform flow of liquid in the flywheel system, and prevent eddy currents or sliding phenomena caused by unstable liquid flow, which may cause instability of the device. When the liquid enters the flywheel outer cavity 9, the radial baffles 7 separate the liquid flow path to ensure the uniform distribution of the liquid in the flywheel outer cavity 9, further stabilize the inertial response of the device, and enhance its operational reliability.

[0029] The outside of the flywheel inner cavity 8 is connected to the flywheel outer cavity 9 through a double-bottom pipe 12, and the flywheel inner cavity 8 and the flywheel outer cavity 9 are connected by the double-bottom pipe 12 to form a connected fluid system. According to the principles of fluid mechanics, the flow of liquid depends on the pressure difference between the inner cavity and the outer cavity. When the air pressure changes, a pressure difference will be formed between the inner and outer cavities, and the liquid will flow between the flywheel inner cavity 8 and the flywheel outer cavity 9 until the air pressure between the two cavities is balanced. When the temperature remains unchanged, the air pressure is inversely proportional to the volume of the gas. When the gas in the flywheel inner cavity 8 is compressed, the air pressure in the inner cavity increases and the volume decreases; conversely, when the gas expands, the air pressure decreases and the volume increases, thereby adjusting the moment of inertia of the flywheel 10.

[0030] When the liquid rotates around the screw shaft in the rotating flywheel 10, the pressure intelligent regulator 11 controls the redistribution of the liquid inside the flywheel 10. The centrifugal pressure of the liquid rotation is offset by pre-charging the outer chamber 9 of the flywheel. The pre-charging pressure depends on factors such as the angular velocity of rotation and the radial distance of the double bottom channel. By adjusting these parameters, the distribution of the liquid in the inner and outer chambers of the flywheel can be controlled, and then the inertia of the device can be adjusted. The flow of liquid and the regulation of internal pressure is a dynamic process. When the liquid flows from the inner chamber 8 of the flywheel to the outer chamber 9 of the flywheel, the inertia of the device will increase; conversely, when the liquid flows back from the outer chamber to the inner chamber, the inertia will decrease.

[0031] The radius of the flywheel inner cavity 8 and the density of the liquid determine the variable volume of the liquid, thereby affecting the range of variation of the inertia. By designing the size of the flywheel inner cavity 8, the maximum capacity of the liquid can be controlled, which directly affects the variable range of the device inertia. The higher the height of the liquid, the greater the mass, and the greater the amplitude of the change in inertia. The diameters of the flywheel inner cavity 8 and the flywheel outer cavity 9 can be freely selected in the space between the two according to design requirements. The radius of the flywheel outer cavity 9 determines the volume of gas in contact with the fluid, which can be limited by adjusting the radius of the flywheel outer cavity 9. By designing the size ratio of the inner and outer cavities, the flow of the liquid and the effect of inertia regulation can be optimized.

[0032] When the flywheel 10 reduces its speed, the air pressure in the flywheel inner cavity 8 is reduced accordingly, and the pre-charged air pressure in the flywheel outer cavity 9 plays a major role, pushing the liquid back to the flywheel inner cavity 8 through the double-bottom pipe 12. The liquid and its mass are moved from the large radius position of the flywheel outer cavity 9 to the small radius position of the flywheel inner cavity 8, reducing the inertia of the device. When the pressure intelligent regulator 11 pushes the liquid from the flywheel inner cavity 8 to flow into the flywheel outer cavity 9, the pressure difference in the pipeline drives the liquid to flow. The pressure drop of the liquid flow is affected by factors such as pipeline friction, liquid density and flow rate. These factors determine the flow of liquid between the inner and outer cavities of the flywheel, thereby affecting the response speed of the inertia regulation.

[0033] The intelligent pressure regulator 11 adjusts the air pressure in the flywheel cavity 8 to achieve dynamic changes in the air pressure gradient when the liquid flows between the inner and outer cavities. The pressure drop generated during the flow of the liquid directly affects the flow rate and flow rate of the fluid, resulting in changes in the internal mass distribution, and then adjusting the inertial characteristics of the device. By controlling the air pressure in the flywheel cavity 8, the inertia can be quickly and flexibly adjusted.

[0034] The technical principle of the device is as follows: the ball screw 1 drives the flywheel 10 to rotate, provides inertial force, and dynamically adjusts the air pressure in the flywheel cavity 8 through the intelligent pressure regulator 11, thereby controlling the mass distribution of the internal liquid and realizing stepless and continuous adjustment of the inertia coefficient. Since the liquid is incompressible, its volume remains basically constant during operation. By effectively controlling the air pressure in the flywheel cavity 8, the mass distribution of the liquid is dynamically adjusted, thereby realizing continuous adjustment of the inertia coefficient.

[0035] Embodiment 2 The driving assembly in the present invention can also be a gear drive, a belt drive or a direct drive motor. The most suitable driving mode can be selected according to application requirements and cost considerations.

[0036] The main support structure in the present invention can be made of high-strength, lightweight materials, such as carbon fiber composite materials or high-strength aluminum alloys; the liquid medium used in the device can be replaced according to specific needs, such as using liquids of different densities or viscosities to adjust the sensitivity and range of inertia changes.

[0037] In the present invention, a self-regulating electric pump system can be added to the intelligent pressure regulator to achieve higher response speed and better energy saving effect. By optimizing the control strategy of the pump and adjusting the pressure of the hydraulic system, more precise liquid flow control can be achieved, and the accuracy of inertia regulation can be further improved. Users can choose the most suitable hydraulic components according to specific engineering requirements and environmental conditions to optimize the overall performance.

[0038] Therefore, the present invention adopts the above-mentioned semi-active inertia container based on pressure control, which can not only realize the stepless adjustment of the inertia coefficient, but also effectively avoid the wear problem of the mechanical device and reduce the manufacturing and maintenance costs of the device.

[0039] It is worth noting that the contents not elaborated in detail in the present invention are all prior art and are well known to those skilled in the art.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A semi-active inertia chamber based on pressure control, characterized in that: It includes a main support structure, which is composed of a top plate and a bottom plate, with support frames evenly distributed between the top plate and the bottom plate, a drive assembly installed at the center of the main support structure, and a pressure regulating assembly connected to the bottom of the drive assembly.

2. A semi-active inertia chamber based on pressure control according to claim 1, characterized in that: The driving assembly comprises a ball screw which vertically penetrates the top plate and the bottom plate and is matched and connected with a ball nut.

3. A semi-active inertia chamber based on pressure control according to claim 2, characterized in that: The top end and the bottom end of the ball screw are fixed on the top plate and the bottom plate through bearing seats.

4. A semi-active inertia container based on pressure control according to claim 3, characterized in that: The outer side of the ball screw is matched with a gasket, and the two sides of the gasket are arranged on the support frame through flange bearing sleeves, and the flange bearing is installed on the support frame through bolts.

5. A semi-active inertia container based on pressure control according to claim 4, characterized in that: The pressure regulating assembly comprises a flywheel, the bottom of the ball screw is connected to the flywheel via a connecting flange, and a buffer block is arranged between the connecting flange and the gasket.

6. A semi-active inertia container based on pressure control according to claim 5, characterized in that: The flywheel comprises a flywheel inner cavity and a flywheel outer cavity. The flywheel inner cavity is installed in the central area of ​​the flywheel, and the flywheel inner cavity is connected to a pressure intelligent regulator.

7. A semi-active inertia chamber based on pressure control according to claim 6, characterized in that: The outside of the flywheel inner cavity is connected to the flywheel outer cavity through a double-bottom pipeline, and radial partitions are evenly arranged between the flywheel inner cavity and the flywheel outer cavity.

8. The semi-active inertia chamber based on pressure control according to claim 1, characterized in that: The support frame is fixedly connected to the top plate and the bottom plate by bolts, and a fixing gasket is arranged on the inner side of the bottom plate.

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