Quasi-zero stiffness vibration isolator, cell element module, noise reduction device and noise reduction system

Abstract

The invention provides a quasi-zero stiffness vibration isolator, a cell element module, a noise reduction device and a noise reduction system. The quasi-zero stiffness vibration isolator comprises a positive stiffness element and a plurality of negative stiffness elements connected to the side face of the positive stiffness element at a certain inclination angle. The quasi-zero stiffness vibration isolators can achieve the high-static and low-dynamic function for the superstructure vibration and noise reduction device, the positive stiffness elements serve as supports, the static stiffness is improved, and the static deformation amount is effectively reduced; the negative stiffness element effectively reduces the dynamic stiffness, so that the superstructure vibration and noise reduction device containing the metal rubber with stable performance is obtained, the problem of unstable vibration isolation and noise reduction performance in the prior art is solved, and the vibration isolation and reduction performance of the rubber vibration isolation pad can be effectively enhanced; the superstructure vibration and noise reduction device is installed on the power equipment, so that vibration caused by a vibration source is effectively isolated, noise generated by vibration is reduced, and a good noise reduction effect is achieved.

Description

Technical Field

[0001] The present invention relates to the field of vibration reduction and noise reduction devices, and in particular to a quasi-zero stiffness vibration isolator, a cell module, a noise reduction device and a noise reduction system. Background Art

[0002] Substation equipment is one of the most harmful and direct environmental pollutants in power transmission and transformation projects. It has the characteristics of long transmission distance, slow attenuation, great harm, difficult to control and 24-hour uninterrupted operation. It has become an important environmental pollution affecting residents' lives.

[0003] At present, the vibration and noise control of substation equipment in substations (converter stations) mainly adopts rubber vibration isolation pads or direct welding to the base. However, due to the working environment and weather resistance, rubber vibration isolation pads need to be maintained regularly, and their service performance cannot continuously achieve stable vibration reduction and noise reduction effects. As the operating time increases, their vibration reduction and noise reduction effects gradually decrease, and they cannot meet the needs of low noise around substations (converter stations). Further research is needed on rubber vibration isolation devices that integrate high load-bearing capacity, high damping, high weather resistance, and wide damping service temperature threshold. Summary of the invention

[0004] In order to solve the problems in the prior art that the vibration and noise reduction effects of substation equipment in substations (converter stations) are restricted by service performance, the present invention proposes a quasi-zero stiffness isolator, comprising a positive stiffness element and a plurality of negative stiffness elements connected to the side of the positive stiffness element at a certain inclination angle.

[0005] Preferably, the inclination angle is 0-30°.

[0006] Preferably, the number of the negative stiffness elements is at least 3, the three negative stiffness elements are respectively located in different directions on the side of the positive stiffness element, and the three negative stiffness elements are respectively connected to the side of the positive stiffness element.

[0007] Preferably, the form of the negative stiffness element is determined according to the vibration reduction and isolation requirements, including: an inclined spring, an inclined variable-section thin-sheet beam, a buckling plate or a combined permanent magnet.

[0008] Preferably, the positive stiffness element is metal rubber.

[0009] Preferably, the cross-sectional shape of the metal rubber is determined according to vibration reduction and isolation requirements, including: circular or rectangular.

[0010] Preferably, the material of the metal rubber is determined according to actual working conditions and vibration reduction and isolation requirements, including: stainless steel wire, Si steel wire or nickel-titanium alloy wire.

[0011] The present invention also provides a vibration and noise reduction cell module, which is located between the power equipment and the ground base. The cell module includes: a base and a plurality of quasi-zero stiffness isolators as described above; the positive stiffness element is connected to the base through the negative stiffness element.

[0012] Preferably, a groove is provided on one side of the base, the positive stiffness element is located inside the groove, and one end of the negative stiffness element is connected to the side surface of the positive stiffness element and the other end is connected to the inner wall of the groove.

[0013] Preferably, two positive stiffness elements are symmetrically arranged in the groove, and one side of the two positive stiffness elements are installed at the center of the base groove with one side abutting against each other.

[0014] Preferably, a vertical support member is provided between the groove of the base and directly below the positive stiffness element, and the vertical support member ensures that when the quasi-zero stiffness isolator is in a balanced position, the height of the upper surface of the positive stiffness element is higher than the height of the base.

[0015] Preferably, the form of the vertical support member is determined according to actual working conditions, including: a support spring, a piezoelectric material or an actuator.

[0016] The present invention also provides a superstructure vibration and noise reduction device containing metal rubber, comprising: a lower plate body installed on a ground base and a plurality of vibration and noise reduction cell modules as described above arranged in the lower plate body.

[0017] Preferably, a reserved groove is provided on the lower plate body, and the base of the vibration reduction and noise reduction cell module is fixed in the reserved groove by bolts. After fixation, the height of the vibration reduction and noise reduction cell module is always higher than the end face of the reserved groove.

[0018] Preferably, the vibration reduction and noise reduction cell modules are grouped into two, and a group of the vibration reduction and noise reduction cell modules are fixed in the lower plate body to form a super-structure vibration reduction device containing metal rubber.

[0019] The present invention also provides a vibration reduction and noise reduction system, comprising an electric device and a super-structure vibration reduction and noise reduction device containing metal rubber as described above, which is arranged at the bottom of the electric device.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a quasi-zero stiffness vibration isolator, a cell module, a noise reduction device and a noise reduction system. The quasi-zero stiffness vibration isolator comprises: a positive stiffness element and a plurality of negative stiffness elements connected to the side of the positive stiffness element at a certain inclination angle; the quasi-zero stiffness vibration isolator can realize the "high static and low dynamic" function for the super-structure vibration reduction and noise reduction device, and the positive stiffness element as a support improves the static stiffness and effectively reduces the static deformation; the negative stiffness element effectively reduces the dynamic stiffness, thereby obtaining a super-structure vibration reduction and noise reduction device containing metal rubber with stable performance, solving the problem of unstable vibration isolation and noise reduction performance in the prior art, and being able to effectively enhance the vibration reduction and noise reduction performance of the rubber vibration isolation pad; the super-structure vibration reduction and noise reduction device is installed with the power equipment, thereby effectively isolating the vibration caused by the vibration source, thereby reducing the noise generated by the vibration, and achieving a good noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of a quasi-zero stiffness vibration isolator of the present invention;

[0023] Figure 2 This is a structural diagram of a metal rubber block of a quasi-zero stiffness vibration isolator of the present invention;

[0024] Figure 3 A schematic diagram of a rectangular metal rubber of a quasi-zero stiffness vibration isolator of the present invention;

[0025] Figure 4 Schematic diagram of a circular metal rubber of a quasi-zero stiffness vibration isolator of the present invention

[0026] Figure 5 This is a schematic diagram of the structure of a vibration reduction and noise reduction cell module of the present invention;

[0027] Figure 6 This is a schematic diagram of the installation of a super-structure vibration and noise reduction device containing metal rubber according to the present invention;

[0028] Figure 7 It is an isometric view of a vibration and noise reduction cell module of the superstructure containing metal rubber and inclined variable-section thin-sheet beams of the present invention;

[0029] Figure 8 It is an isometric view of a vibration and noise reduction cell module of the superstructure containing metal rubber and piezoelectric material of the present invention;

[0030] Among them: 1-lower plate, 2-metal rubber, 3-inclined spring, 4-support spring, 5-base, 6-inclined variable-section thin-sheet beam, 7-piezoelectric material, 8-energy-consuming circuit, 9-electrical equipment oil tank. DETAILED DESCRIPTION

[0031] Embodiment 1:

[0032] like Figure 1As shown, a quasi-zero stiffness vibration isolator includes a positive stiffness element and a plurality of negative stiffness elements connected to the side of the positive stiffness element at a certain inclination angle.

[0033] The positive stiffness element is used to provide positive stiffness, and the negative stiffness element is used to provide negative stiffness. When subjected to pressure, the positive stiffness and the negative stiffness offset each other to effectively reduce the dynamic stiffness, thereby stabilizing the performance.

[0034] The positive stiffness element has the function of reducing vibration and noise, and can be used in a vibration and noise reduction device to reduce the vibration generated by the electric equipment.

[0035] The positive stiffness element mainly provides static stiffness, and the negative stiffness element mainly provides dynamic stiffness, thereby forming a high static and low dynamic quasi-zero stiffness vibration isolator, which has a good suppressing effect on the vibration on the transmission path, thereby achieving a noise reduction function.

[0036] Preferably, the inclination angle is 0-30°.

[0037] The inclination angle formed between the side surface of the positive stiffness element and the negative stiffness element can be adjusted between 0-30° according to the application environment and actual working conditions, and can ensure that the negative stiffness element is in a horizontal state after being compressed.

[0038] Preferably, the number of the negative stiffness elements is at least 3, the three negative stiffness elements are respectively located in different directions on the side of the positive stiffness element, and the three negative stiffness elements are respectively connected to the side of the positive stiffness element.

[0039] The negative stiffness element is connected to the side of the positive stiffness element. The three negative stiffness elements fix the positive stiffness element from different directions respectively, which can ensure that the positive stiffness element can maintain a balanced state before and after being compressed, thereby improving stability.

[0040] Preferably, the form of the negative stiffness element is determined according to the vibration reduction and isolation requirements, and includes: an inclined spring 3, an inclined variable-section thin-sheet beam 6, a buckling plate or a combined permanent magnet.

[0041] The oblique spring 3, the oblique variable-section thin-sheet beam 6, the buckling plate or the combined permanent magnet are all elastic parts, which can effectively reduce the dynamic stiffness and have a good suppressing effect on vibration noise.

[0042] like Figure 2 As shown, the positive stiffness element is a metal rubber 2 .

[0043] The metal rubber 2 plays a supporting role to improve the static rigidity and effectively reduce the static deformation.

[0044] The metal rubber 2 is an elastic porous material formed by weaving and winding metal wires, and its main parameter indicators include metal wire composition, wire diameter, elastic modulus, strength, loss factor, etc. Among them, the elastic modulus determines the stiffness of the material, the strength affects its bearing capacity, and the loss factor reflects the vibration reduction and energy absorption performance of the material.

[0045] Metal rubber 2 has the advantages of high temperature resistance, impact resistance, high damping, high elasticity, and a wide vibration isolation frequency range. It can be used for vibration and noise reduction components in harsh service environments such as long service time, high temperature, and large deformation. In practical applications, the selection of its parameter indicators is comprehensively considered based on specific usage requirements and working conditions.

[0046] In the field of mechanical vibration, the principle of metal rubber 2 vibration reduction and energy absorption is mainly as follows: it is made of woven and wound metal wires. When vibrating, the metal wires consume energy through dry friction and convert the energy into heat energy dissipation. At the same time, its own elastic deformation and damping effect can absorb part of the vibration energy and hinder the propagation of vibration, playing a role in vibration reduction and energy absorption, thereby reducing the vibration amplitude and transmission.

[0047] like Figure 3 and Figure 4 As shown, the cross-sectional shape of the metal rubber 2 is determined according to the vibration reduction and isolation requirements, including: circular or rectangular.

[0048] The metal rubber 2 is arranged at the bottom of the oil tank 9 of the electric equipment. According to the shape of the bottom of the oil tank, a metal rubber 2 with a more stable shape is selected to support the oil tank to maintain balance and reduce vibration.

[0049] Preferably, the material of the metal rubber 2 is determined according to actual working conditions and vibration reduction and isolation requirements, including: stainless steel wire, Si steel wire or nickel-titanium alloy wire.

[0050] When subjected to an alternating load, the internal turns of the metal rubber 2 and the side of the metal rubber 2 contact each other to dissipate energy through dry friction. The metal rubber superstructure vibration reduction device can effectively weaken the vibration energy transmitted to the base.

[0051] Embodiment 2:

[0052] The present invention also provides a vibration reduction and noise reduction cell module, such as Figure 5 As shown, the cell module is located between the power equipment and the ground base, and the cell module includes: a base 5 and a plurality of quasi-zero stiffness isolators as described above; the positive stiffness element is connected to the base 5 through the negative stiffness element.

[0053] The cell module is composed of a plurality of quasi-zero stiffness dampers and a base 5 for fixing the quasi-zero stiffness dampers. The number of the cell modules can be reasonably selected according to actual working conditions and application environment.

[0054] Preferably, a groove is provided on one side of the base 5, the positive stiffness element is located inside the groove, and one end of the negative stiffness element is connected to the side surface of the positive stiffness element and the other end is connected to the inner wall of the groove.

[0055] The base 5 is a square frame with a groove on one side. The positive stiffness element is arranged inside the groove. One end of the negative stiffness element is connected to the side wall of the positive stiffness element, and the other end is connected to the inner wall of the groove. The positive stiffness element is fixed and supported to have a certain distance from the ground of the groove.

[0056] Preferably, two positive stiffness elements are symmetrically arranged in the groove, and one side of the two positive stiffness elements is installed at the center of the groove of the base 5 so as to abut against each other.

[0057] According to the actual working conditions and application environment, the quasi-zero stiffness isolators are preferably arranged in a group of two in the groove of the base 5, and some side surfaces of the two quasi-zero stiffness isolators abut against each other, and the negative stiffness element is connected to the remaining side surfaces and is divided into three directions to fix the positive stiffness element from three directions. Arranging the negative stiffness elements in three different directions has better stability.

[0058] When the metal rubber 2 is rectangular, the contact between the two metal rubbers 2 is line contact, that is, the vertical edges on one side of the metal rubber 2 are in contact with each other.

[0059] Preferably, a vertical support member is further provided between the groove of the base 5 and directly below the positive stiffness element, and the vertical support member ensures that when the quasi-zero stiffness isolator is in a balanced position, the height of the upper surface of the positive stiffness element is higher than the height of the base 5.

[0060] The vertical support member is arranged directly below the metal rubber 2, the lower end surface of the metal rubber 2 is connected to the vertical support member, the number of the support springs 4 is consistent with the number of the metal rubber 2, and when the metal rubber 2 is deformed by vertical pressure, the bottom vertical support member is subjected to force to generate a support reaction force.

[0061] When the entire cell module is in a balanced position, the height of the metal rubber 2 is higher than the height of the base 5 .

[0062] Preferably, the form of the vertical support member is determined according to the requirements of actual working conditions, including: a support spring 4, a piezoelectric material 7 or an actuator.

[0063] When in use, the reaction force provided by the negative stiffness element and the vertical support member offsets the weight of the power equipment itself. The superstructure vibration reduction device containing the metal rubber 2 is evenly compressed and is in a balanced state with the negative stiffness element. The metal rubber 2 and the vertical support member mainly provide static stiffness, and the negative stiffness element mainly provides dynamic stiffness, thereby forming a high static and low dynamic quasi-zero stiffness vibration isolator.

[0064] When the core winding vibration propagates outward through the oil tank wall of the power equipment oil tank 9, the inclined spring 3 is preferably used to provide negative stiffness, and the metal rubber 2 provides positive stiffness to effectively suppress the vibration on the transmission path. When subjected to alternating loads, the internal turns of the metal rubber 2 and the side of the metal rubber 2 contact each other to dissipate energy through dry friction. Therefore, the metal rubber superstructure vibration reduction device can effectively weaken the vibration energy transmitted to the base.

[0065] Embodiment 3:

[0066] The present invention also provides a superstructure vibration and noise reduction device containing metal rubber, comprising: a lower plate body 1 installed on a ground base and a plurality of vibration and noise reduction cell modules as described above arranged in the lower plate body 1.

[0067] The superstructure is a product composed of multiple identical cell structures that together form a device, which changes the propagation path of vibration, absorbs energy, or produces interference effects through specific geometric layout, material properties, and interaction with other components. For example, some periodic or non-periodic structural combinations can achieve vibration reduction and noise reduction functions by regulating sound waves or vibration waves.

[0068] The number of cell modules can be reasonably selected according to actual working conditions and application environment.

[0069] The super-structure vibration reduction and noise reduction device is located at the bottom of the power equipment oil tank 9 and is fixedly connected to the mounting base through the lower plate body 1; the lower plate body 1 is connected and fixed to the base through M10 bolts. After placement, the height of the super-structure vibration reduction and noise reduction device is still higher than the upper end surface of the reserved groove after being compressed.

[0070] The super-structure vibration and noise reduction device is installed with the power equipment to effectively isolate the vibration caused by the vibration source, thereby reducing the noise generated by the vibration and achieving a good noise reduction effect.

[0071] Preferably, a reserved groove is provided on the lower plate body 1, and the base 5 of the vibration reduction and noise reduction cell module is fixed in the reserved groove by bolts. After fixation, the height of the vibration reduction and noise reduction cell module is always higher than the end face of the reserved groove.

[0072] Each vibration reduction and noise reduction cell module is placed in the reserved groove of the lower plate body 1 for fixation, and the lower plate body 1 is connected and fixed to the base by M10 bolts. After placement, the height of the superstructure vibration reduction and noise reduction device is still higher than the upper end surface of the reserved groove after being compressed.

[0073] Preferably, the vibration reduction and noise reduction cell modules are grouped into two, and a group of the vibration reduction and noise reduction cell modules are fixed in the lower plate body 1 and combined into a super-structure vibration reduction device containing metal rubber.

[0074] Two groups of vibration-damping and noise-reducing cell modules are combined into a super-structure vibration-damping device containing metal rubber. A total of 12 groups of vibration-damping and noise-reducing cell modules, namely, 6 super-structure vibration-damping devices containing metal rubber, are arranged at the bottom of the power equipment oil tank 9, respectively, at the four pad positions and the middle position of the bottom of the power equipment oil tank 9.

[0075] Embodiment 4:

[0076] like Figure 6 As shown, the present invention also provides a vibration reduction and noise reduction system, comprising an electric power device and a super-structure vibration reduction and noise reduction device containing metal rubber as described above, which is arranged at the bottom of the electric power device.

[0077] The cell modules are spliced ​​and combined to form a super-structure vibration and noise reduction device, which is installed between the transformer composite oil tank and the ground base. On the one hand, it can attenuate the vibration of the composite oil tank, and on the other hand, it can suppress the body noise.

[0078] Embodiment 5:

[0079] like Figure 7 As shown, when the negative stiffness element adopts, for example, an inclined variable-section thin-film beam structure, the inclined variable-section thin-film beam 6 is in a bent state, providing a vertical upward support reaction force. When the loaded object vibrates, the inclined variable-section thin-film beam 6 provides negative stiffness, and when used in conjunction with the metal rubber 2, it can have a good suppressing effect on the vibration noise of the system.

[0080] Embodiment 6:

[0081] like Figure 8 As shown, when the system vibrates, the negative stiffness element and the metal rubber 2 provide passive vibration isolation. When the piezoelectric material 7 is loaded and vibrates to produce displacement, the piezoelectric material 7 is externally connected to an energy-consuming circuit 8, which can convert the mechanical energy generated by the vibration into electrical energy for energy dissipation through the components of the external circuit, thereby effectively improving the damping characteristics of the system and realizing active and passive integrated control.

[0082] The support spring 4 can be replaced by a piezoelectric material 7 according to actual working conditions. When the vibration reduction and noise reduction device is compressed and drives the piezoelectric material 7 to displace, the piezoelectric material 7 is externally connected to an energy-consuming circuit 8 for energy dissipation.

[0083] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A quasi-zero stiffness vibration isolator, characterized in that it comprises a positive stiffness element and a plurality of negative stiffness elements connected to the side of the positive stiffness element at a certain inclination angle.

2. A quasi-zero stiffness isolator as claimed in claim 1, characterized in that: The inclination angle is 0-30°.

3. A quasi-zero stiffness vibration isolator as claimed in claim 1, characterized in that: The number of the negative stiffness elements is at least three, the three negative stiffness elements are respectively located in different directions on the side of the positive stiffness element, and the three negative stiffness elements are respectively connected to the side of the positive stiffness element.

4. A quasi-zero stiffness vibration isolator as claimed in claim 1, characterized in that: The form of the negative stiffness element is determined according to the vibration reduction and isolation requirements, and includes: an inclined spring (3), an inclined variable-section thin-sheet beam (6), a buckling plate or a combined permanent magnet.

5. A quasi-zero stiffness vibration isolator as claimed in claim 1, characterized in that: The positive stiffness element is metal rubber (2).

6. A quasi-zero stiffness vibration isolator as claimed in claim 5, characterized in that: The cross-sectional shape of the metal rubber (2) is determined according to the vibration reduction and isolation requirements, including: circular or rectangular.

7. A quasi-zero stiffness vibration isolator as claimed in claim 6, characterized in that: The material of the metal rubber (2) is determined according to actual working conditions and vibration reduction and isolation requirements, and includes: stainless steel wire, Si steel wire or nickel-titanium alloy wire.

8. A vibration reduction and noise reduction cell module, characterized in that: The cell module is located between the power equipment and the ground base, and comprises: a base (5) and a plurality of quasi-zero stiffness isolators according to any one of claims 1 to 7; the positive stiffness element is connected to the base (5) via the negative stiffness element.

9. A vibration reduction and noise reduction cell module as claimed in claim 8, characterized in that: A groove is provided on one side of the base (5), the positive stiffness element is located inside the groove, one end of the negative stiffness element is connected to the side surface of the positive stiffness element, and the other end is connected to the inner wall of the groove.

10. The vibration reduction and noise reduction cell module according to claim 9, characterized in that: Two positive stiffness elements are symmetrically arranged in the groove, and one side of the two positive stiffness elements is installed at the center of the groove of the base (5) with one side abutting against the other.

11. The vibration and noise reduction cell module according to claim 9, characterized in that: A vertical support member is also provided between the groove and directly below the positive stiffness element, and the vertical support member enables the height of the upper surface of the positive stiffness element to be higher than the height of the base (5) when the quasi-zero stiffness isolator is in a balanced position.

12. A vibration and noise reduction cell module according to claim 11, characterized in that: The form of the vertical support member is determined according to actual working conditions, and includes: a support spring (4), a piezoelectric material (7) or an actuator.

13. A superstructure vibration and noise reduction device, characterized in that: include: A lower plate body (1) mounted on a ground base and a plurality of vibration and noise reduction cell modules according to any one of claims 8 to 12 arranged in the lower plate body (1).

14. A superstructure vibration and noise reduction device according to claim 13, characterized in that: The lower plate (1) is provided with a reserved groove, and the base (5) of the vibration reduction and noise reduction cell module is fixed in the reserved groove by bolts. After fixation, the height of the vibration reduction and noise reduction cell module is always higher than the end surface of the reserved groove.

15. The superstructure vibration and noise reduction device according to claim 13, characterized in that: The vibration reduction and noise reduction cell modules are grouped into two, and a group of the vibration reduction and noise reduction cell modules are fixed in the lower plate body (1) and combined into a super-structure vibration reduction device containing metal rubber.

16. A vibration reduction and noise reduction system, characterized in that: The invention comprises an electric power device and a superstructure vibration and noise reduction device as claimed in any one of claims 13 to 15 arranged at the bottom of the electric power device.

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