Vibration isolator and local resonance type rubber vibration isolator

Abstract

According to the vibration isolator and the local resonance type rubber vibration isolator, the capacity of controlling large wavelength by small size is achieved through the local resonance structure, and the vibration isolation performance of the rubber vibration isolator can be effectively improved. According to the main technical scheme, the vibration isolation piece comprises an elastic base body and an elastic part, the plurality of local resonance vibrators are arranged in the elastic substrate, each local resonance vibrator at least comprises a resonance area, the elastic modulus of the resonance area is larger than that of the elastic substrate, and the density of the resonance area is larger than that of the elastic substrate. The vibration isolator is mainly used for equipment vibration isolation.

Description

Technical Field

[0001] The invention relates to the technical field of vibration isolators, and in particular to a vibration isolator and a local resonance type rubber vibration isolator. Background Art

[0002] During the operation and production of equipment, vibrations will inevitably occur, which will cause safety hazards such as structural fatigue and fracture, which is unacceptable in survival activities, especially in nuclear power plant safety-related equipment. For equipment, vibration isolators are important vibration reduction components that suppress the transmission of vibrations along the path. They are widely used in structures such as ships, railways, buildings, and nuclear power plants, and can effectively improve the vibration and noise suppression performance of the structure.

[0003] The use of rubber isolators is a common means of vibration isolation. The current rubber isolator technology has the following disadvantages: (1) The contradiction between the load-bearing capacity of the isolator and the vibration isolation effect: In order to obtain a better vibration isolation effect, it is usually necessary to reduce the vibration isolation frequency, that is, to reduce the stiffness of the isolator. However, reducing the stiffness means increasing the deformation of the isolator, causing the equipment to produce a larger displacement when it is vibrated, which has a more serious adverse effect on the safety, reliability and stability of the equipment; (2) The inadequate low-frequency vibration isolation performance of the isolator: Due to the high damping of the rubber material, the rubber isolator can achieve a good vibration isolation effect in the high-frequency band, but the medium-frequency resonance and low-frequency resonance performance of the internal components are insufficient, and the equipment vibration is actively concentrated in the medium and low frequencies, which leads to insufficient vibration isolation performance. Summary of the invention

[0004] In view of this, in order to solve at least one of the above technical problems, the present invention provides a vibration isolator and a local resonance type rubber vibration isolator.

[0005] In order to achieve the above object, the present invention mainly provides the following technical solutions:

[0006] In one aspect, the present invention provides a vibration isolator, comprising:

[0007] An elastic substrate (100);

[0008] A plurality of local resonance vibrators (200) are arranged in an elastic matrix (100); the local resonance vibrators (200) at least include a resonance region; the elastic modulus of the resonance region is greater than the elastic modulus of the elastic matrix (100); and the density of the resonance region is greater than the density of the elastic matrix (100).

[0009] Wherein, the material of the elastic matrix (100) includes a polymer material;

[0010] The material of the elastic matrix (100) includes at least one of natural rubber, polyurethane, fluororubber, chlororubber, butyl rubber, silicone rubber, acrylic rubber, styrene-butadiene rubber, EPDM rubber, butadiene rubber, chloroprene rubber and their blends or copolymer modifications.

[0011] Wherein, the number of local resonance oscillators (200) is plural;

[0012] A plurality of local resonance vibrators (200) are periodically and evenly dispersed in the elastic matrix (100).

[0013] Wherein, the local resonance oscillator (200) is a sphere, a polyhedron or an irregular shape.

[0014] The distance between the centers of gravity of adjacent local resonance vibrators (200) is not less than the maximum outer diameter of the local resonance vibrators (200), and the distance between the centers of gravity of adjacent local resonance vibrators (200) is not greater than five times the maximum outer diameter of the local resonance vibrators (200).

[0015] The resonance region is the entire region of the local resonance oscillator (200).

[0016] The local resonance oscillator (200) comprises a central counterweight (210), an elastic intermediate body (220) and an outer shell (230), wherein the outer shell (230) is located at the periphery of the central counterweight (210), the elastic intermediate body (220) is located between the outer shell (230) and the central counterweight (210), and the resonance region at least includes the entire region of the central counterweight (210).

[0017] The elastic modulus of the elastic intermediate (220) is smaller than the elastic modulus of the elastic base (100).

[0018] On the other hand, the present invention also provides a local resonance type rubber vibration isolator, comprising any one of the vibration isolating members (10) described above, and

[0019] A bearing platform (20), a middle support member (30), a radial elastic body (40), an external support member (50) and a mounting base (60);

[0020] The external support member (50) comprises a receiving cavity and a top opening and a bottom opening communicated with the receiving cavity, the vibration isolator (10) is located in the receiving cavity, the bearing platform (20) is arranged on the top side of the vibration isolator (10), and a part of the structure of the bearing platform (20) extends from the top opening to the outside of the external support member (50) for connecting to the vibration-isolated equipment;

[0021] The middle support member (30) is sleeved on the outer periphery of the side wall of the vibration isolation member (10), and the radial elastic body (40) is located between the middle support member (30) and the outer support member (50);

[0022] The mounting base (60) is connected to the external support member (50) and covers the bottom opening.

[0023] In another aspect, the present invention further provides a local resonance type rubber vibration isolator, comprising any one of the vibration isolating members (10) described above, and

[0024] An upper load-bearing mounting frame (70) and a lower load-bearing mounting frame (80);

[0025] The upper bearing mounting frame (70) is a columnar structure, comprising a mounting hole or a mounting groove for connecting a vibration-isolated device; the vibration isolating member (10) is arranged around the outer periphery of the upper bearing mounting frame (70), and the vibration isolating member (10) is uniform in the circumferential direction and extends away from the upper bearing mounting frame (70) in the axial direction and radial direction of the upper bearing mounting frame (70); the lower bearing mounting frame (80) is arranged on a side of the vibration isolating member (10) away from the upper bearing mounting frame (70), and the lower bearing mounting frame (80) is at least used to support the vibration isolating member (10).

[0026] The vibration isolation part and the local resonance type rubber vibration isolator proposed by the present invention utilize the local resonance structure to achieve the ability of controlling a large wavelength in a small size, which can effectively improve the vibration isolation performance of the rubber vibration isolator. Considering the environmental requirements for basic work and life and the vibration reduction performance of the equipment, it is necessary to control the vibration noise transmitted from the installation position of the power equipment to the isolated equipment. The low-frequency performance of the traditional vibration isolator, especially the rubber vibration isolator, is insufficient, and the vibration requirements of mechanical equipment are mostly concentrated in the low-frequency band. In order to improve the low-frequency performance of the equipment vibration isolator, a plurality of local resonance vibrators distributed in the elastic matrix are arranged, and the extraordinary control of the elastic wave is achieved through the local vibration of the local resonance vibrator. By adjusting the internal parameters of the local resonance vibrator and the arrangement of the local resonance vibrator, the band gap frequency range can be artificially adjusted to achieve the effect of improving the low-frequency performance of the rubber vibration isolator in a targeted manner. It has the characteristics of simple structure and convenient processing. It can block the propagation of vibration waves in a small size, and can effectively improve the vibration isolation performance of the rubber vibration isolator at low and medium frequencies. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic cross-sectional structure diagram of a vibration isolation member provided by an embodiment of the present invention at a first viewing angle;

[0028] Figure 2 A schematic perspective structural diagram of a vibration isolation member provided by an embodiment of the present invention at a second viewing angle;

[0029] Figure 3 A schematic cross-sectional structure diagram of a local resonance vibrator in a vibration isolation member provided by an embodiment of the present invention;

[0030] Figure 4A schematic structural diagram of a local resonance type rubber vibration isolator provided in an embodiment of the present invention;

[0031] Figure 5 A schematic structural diagram of another local resonance type rubber vibration isolator provided in an embodiment of the present invention;

[0032] Figure 6 A graph showing the experimental results of a vibration frequency of a vibration isolation member provided by an embodiment of the present invention;

[0033] Figure 7 In a vibration isolation component provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation method, structure, characteristics and effects of the local resonance type rubber vibration isolator proposed by the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0035] like Figure 1-4 As shown, an embodiment of the present invention provides a vibration isolation member, comprising:

[0036] An elastic substrate (100);

[0037] A plurality of local resonance vibrators (200) are arranged in an elastic matrix (100); the local resonance vibrators (200) at least include a resonance region; the elastic modulus of the resonance region is greater than the elastic modulus of the elastic matrix (100); and the density of the resonance region is greater than the density of the elastic matrix (100).

[0038] The elastic matrix (100) is the main structure of the vibration isolation part, maintaining the outer contour shape of the vibration isolation part. The elastic matrix (100) needs to have a certain elasticity, but the elasticity should not be too large, so as to achieve local resonance and take into account the support capacity of the vibration isolation equipment. The elastic matrix (100) also determines the damping of the vibration isolation part. The selection of the elastic matrix (100) should ensure that the system has appropriate damping. Too much or too little damping will affect the effect of local resonance. The elastic matrix (100) can be made of a variety of materials as needed. The material is mainly a rubber-like polymer material, including but not limited to natural rubber, polyurethane, fluororubber, chlororubber, butyl rubber, silicone rubber, acrylic rubber, styrene-butadiene rubber, EPDM rubber, butadiene rubber, chloroprene rubber and their blends or copolymers. The outer contour shape of the elastic matrix (100) can be various, such as square, cylindrical, flat or irregular.

[0039] Local resonance is a physical phenomenon in which energy is concentrated in a specific area and causes strong vibrations. This phenomenon can be observed in various systems, including phononic crystals, nanometallic crystals, and mechanical superstructures. The local resonance vibrator (200) is used to generate local resonance. At the resonance frequency, energy is concentrated in the local area where the local resonance vibrator (200) is located, resulting in a significant increase in the vibration amplitude of the area. That is, the local resonance vibrator (200) is used to achieve independent vibration of a small area, rather than vibration of the entire vibration isolation member, thereby achieving control of sound wave propagation. The resonance frequency can be determined as needed, that is, the vibration frequency at which the local resonance vibrator (200) is required to generate the local resonance, and then the geometry, mass, and elastic modulus of the local resonance vibrator (200) can be determined based on the resonance frequency. When the frequency of the elastic wave propagating in the elastic matrix (100) approaches the resonance frequency of the local resonance vibrator (200), the local resonance vibrator (200) will have a strong coupling effect with the elastic wave, thereby achieving effective blocking of sound wave propagation within a specific frequency range through the local resonance vibrator (200).

[0040] The resonance region may be the entire region of the local resonance vibrator (200), that is, the local resonance vibrator (200) is an integrated structure made of a single material, and produces a local resonance effect by cooperating with the elastic matrix (100) having elasticity. Alternatively, the resonance region may be only a partial region of the local resonance vibrator (200), such as the local resonance vibrator (200) is a resonant cavity structure, and the local resonance effect is achieved by the resonance region at its center and the elastic member. Further examples will be given below.

[0041] The elastic modulus and density of the material of the resonance region in the local resonance oscillator (200) affect the resonance frequency. In order to achieve that the local resonance oscillator (200) or the resonance region can generate local resonance, the elastic modulus or hardness of the local resonance oscillator (200) or the resonance region, and the density of the local resonance oscillator (200) or the resonance region should be significantly greater than the elastic matrix (100), such as the elastic modulus of the local resonance oscillator (200) or the resonance region and the density of the local resonance oscillator (200) or the resonance region are both more than three times that of the elastic matrix (100). The local resonance oscillator (200) or the resonance region can be made of metal or non-metal or polymer materials, such as steel, copper, lead, glass, ceramics and other polymer materials. In one embodiment, the elastic modulus of the local resonance oscillator (200) or the resonance region ranges from 30GPa to 400GPa, and the density is 5000-20000kg / m 3 The elastic modulus of the elastic matrix (100) is in the range of 0.0001 GPa to 1 GPa, and the density is 900-1500 kg / m 3.

[0042] During the production process, the vibration isolator (10) can be formed by evenly and periodically arranging the local resonance oscillators (200) inside the elastic matrix (100) when the elastic matrix (100) is formed. More specifically, the elastic matrix (100) material can be mixed evenly with auxiliary agents such as a vulcanizing agent, an accelerator, and a filler to form a rubber mix; the local resonance oscillators (200) and the rubber mix can be mixed evenly to obtain a mixture; and the mixture can be vulcanized to obtain a vibration isolator based on local resonance.

[0043] A vibration isolator and a local resonance type rubber vibration isolator proposed in the embodiment of the present invention utilize the local resonance structure to achieve the ability of controlling a large wavelength in a small size, which can effectively improve the vibration isolation performance of the rubber vibration isolator. Considering the environmental requirements for basic work and life and the vibration reduction performance of the equipment, it is necessary to control the vibration noise transmitted from the installation position of the power equipment to the isolated equipment. The low-frequency performance of traditional vibration isolators, especially rubber vibration isolators, is insufficient, and the vibration requirements of mechanical equipment are mostly concentrated in the low-frequency band. In order to improve the low-frequency performance of the equipment vibration isolator, a plurality of local resonance vibrators distributed in the elastic matrix are arranged, and the local vibration of the local resonance vibrator is used to achieve extraordinary control of the elastic wave. By adjusting the internal parameters of the local resonance vibrator and the arrangement of the local resonance vibrator, the band gap frequency range can be artificially adjusted to achieve the effect of improving the low-frequency performance of the rubber vibration isolator in a targeted manner. It has the characteristics of simple structure and convenient processing. It can block the propagation of vibration waves in a small size, and can effectively improve the vibration isolation performance of the rubber vibration isolator at low and medium frequencies.

[0044] The number and arrangement of the local resonance vibrators (200) can be various. For example, they can be arranged in a single direction only. For example, when the device to be isolated is carried in the vertical direction, the local resonance vibrators (200) can be arranged in the vertical direction only, that is, multiple local resonance vibrators (200) are arranged in a single row at intervals. However, such an implementation will result in poor vibration isolation effect in the horizontal direction. In order to ensure that the vibration isolation component has a better vibration isolation effect in all directions, the number of local resonance vibrators (200) is set to a plural number, and the local resonance vibrators (200) are periodically and evenly dispersed in the elastic matrix (100). It can be as follows Figure 2 As shown, the local resonance oscillators (200) form an array of four rows and four columns, and the four arrays are arranged in parallel, so that the local resonance oscillators (200) are arranged periodically. Alternatively, it can be as follows Figure 1 As shown, it is an array of five rows and five columns, or there may be more arrangements. To achieve a better vibration isolation effect, the number of local resonance vibrators (200) arranged in any direction should not be less than three, and the optimal number is more than five.

[0045] An elastic matrix (100) having a local resonance effect is produced by arranging local resonance oscillators (200) uniformly and periodically inside the elastic matrix (100). When an elastic wave of a specific frequency is transmitted, the local resonance oscillator (200) will resonate in whole or in part. Since the local resonance oscillators (200) are arranged periodically inside the elastic matrix (100), the vibrations of adjacent local resonance oscillators (200) are coupled, blocking the transmission of elastic waves within a specific frequency range, and then forming a band gap, which will greatly improve the vibration isolation performance of the rubber isolator at medium and low frequencies.

[0046] The local resonance oscillator (200) can be in various shapes, such as a sphere, a polyhedron or an irregular shape. For example, it can be a cube, a cylinder, a prism, a pyramid, etc. It can also be an ellipsoid, etc. The shape of the local resonance oscillator (200) is preferably a sphere, so that the local resonance oscillator (200) is isotropic and has a good blocking effect on longitudinal waves and transverse waves in the three directions of X / Y / Z. Therefore, it can be used in various forms of vibration isolators without considering the setting direction of the vibration isolator.

[0047] The density of the arrangement of the local resonance vibrators (200) has a direct impact on the vibration isolation frequency. It can be arranged so that the distance between the centers of gravity of adjacent local resonance vibrators (200) is not less than the maximum outer diameter of the local resonance vibrators (200), and the distance between the centers of gravity of adjacent local resonance vibrators (200) is not greater than five times the maximum outer diameter of the local resonance vibrators (200). This can avoid the local resonance vibrators (200) being arranged too densely to affect the broadband vibration isolation effect, and avoid the local resonance vibrators (200) being arranged too sparsely to cause the band gap to be unable to be effectively formed.

[0048] The mass of the local resonance vibrator (200) affects the resonance frequency, and the size of the local resonance vibrator (200) can be adjusted according to the required resonance frequency range, the material of the local resonance vibrator (200), the number of settings, etc. The size of the local resonance vibrator (200) is related to multiple parameters. The setting of parameters such as the size, weight, density of the local resonance vibrator (200) and the size of the elastic matrix (100) is not independent, but mutually restricts and affects each other, and needs to be comprehensively considered to achieve better vibration reduction.

[0049] As mentioned above, the resonance region may be the entire region of the local resonance oscillator (200), that is, the local resonance oscillator (200) only includes the resonance region, the material of the local resonance oscillator (200) is single and uniform, such as a solid metal ball, and the local resonance oscillator (200) as a whole works together with the elastic matrix (100) to generate local resonance.

[0050] Or, if Figure 3As shown, the local resonance oscillator (200) includes a central counterweight (210), an elastic intermediate body (220) and a shell (230), wherein the shell (230) is located at the periphery of the central counterweight (210), and the elastic intermediate body (220) is located between the shell (230) and the central counterweight (210), and the resonance region includes the entire region of the central counterweight (210), that is, the central counterweight (210) is the resonance region, and the central counterweight (210) and the elastic intermediate body (220) resonate.

[0051] The local resonance vibrator (200) is composed of an elastic intermediate body (220) and an outer shell (230) with a counterweight at the center and uniformly distributed in the remaining internal space. The outer shell (230) is mainly composed of a metal material that can be tightly bonded to the elastic intermediate body (220). The main function is to form a space for the resonance structure in the local resonance vibrator (200) and to bond to the elastic matrix (100). The material of the elastic intermediate body (220) can be selected according to the requirements for the control frequency range of the vibration isolation part. An elastic material with an appropriate elastic modulus can be selected, or a metamaterial structure can be directly selected to produce a correct elastic modulus. The main function is to cooperate with the central counterweight (210) to produce resonance of a specific frequency. The central counterweight (210) is preferably composed of a metal or non-metal material with a relatively high density to form the aforementioned resonance region. The main function of the central counterweight (210) is to cooperate with the elastic intermediate body (220) to produce resonance of a specific frequency. The above arrangement enables the local resonance vibrator (200) to generate local resonance by itself through the structural arrangement, and then the targeted resonance frequency can be adjusted more flexibly, thereby reducing the constraints on the resonance frequency allowed by the elastic matrix (100).

[0052] The shapes of the center counterweight (210) and the shell (230) can be various. For example, the center counterweight (210) and the shell (230) are both spherical, the center counterweight (210) and the shell (230) are arranged with the same spherical center, and the elastic intermediate (220) is evenly arranged around the periphery of the center counterweight (210). Alternatively, the center counterweight (210) and the shell (230) can be both cubes, but the elastic intermediate (220) will not be able to maintain a consistent volume at all locations around the periphery of the center counterweight (210), which may reduce the balance of the isotropic resonance. Alternatively, the shapes of the center counterweight (210) and the shell (230) can also be different. The shell (230) can be a closed shell, which then provides a closed chamber structure for the resonance of the center counterweight (210) and provides a better resonance environment. Alternatively, the shell (230) can also be non-closed, that is, it provides support for the elastic intermediate (220) in some directions.

[0053] In one embodiment, the elastic modulus of the elastic intermediate (220) is smaller than the elastic modulus of the elastic matrix (100), that is, the elastic intermediate (220) can be made of a softer material than the elastic matrix (100), thereby enabling the central counterweight (210) to resonate locally at a lower resonance frequency, so that the vibration isolation member can achieve vibration isolation at a lower frequency.

[0054] The aforementioned vibration isolator (10) can be used alone, or can be used in conjunction with a connection structure or an additional support and vibration reduction structure to provide a more convenient installation and a better vibration reduction effect. The following examples are two vibration isolators using the aforementioned vibration isolator (10). It can be understood that the vibration isolator (10) can also have more usage scenarios, which will not be listed one by one.

[0055] like Figure 4 As shown, the present invention also provides a local resonance type rubber vibration isolator, comprising any of the vibration isolators (10) described above, as well as a bearing platform (20), a middle support member (30), a radial elastic body (40), an external support member (50) and a mounting base (60). The external support member (50) comprises a receiving cavity and a top opening and a bottom opening connected to the receiving cavity, the vibration isolator (10) is located in the receiving cavity, the bearing platform (20) is arranged on the top side of the vibration isolator (10), and part of the structure of the bearing platform (20) extends from the top opening to the outside of the external support member (50) for connecting to the vibration-isolated device. The middle support member (30) is sleeved on the outer periphery of the side wall of the vibration isolator (10), and the radial elastic body (40) is located between the middle support member (30) and the external support member (50). The mounting base (60) is connected to the external support member (50) and covers the bottom opening.

[0056] The external support member (50) is the outermost shell, which is hollow and has openings at both ends, and is used to provide an internal space to accommodate the main components of the vibration isolator, and to provide a rigid boundary and a limit. The top opening is for the upper end surface of the bearing platform (20) to pass through, and the bottom opening is for the various components of the vibration isolator to be installed, and cooperates with the mounting base (60) to form a closed space. The vibration isolator (10) can be of various shapes. When the vibration isolator (10) is columnar, the external support member (50), the middle support member (30) and the radial elastic body (40) adapt to the shape of the vibration isolator (10) to be cylindrical, but the above components can also be selected in other shapes according to actual needs. The bearing platform (20) is stepped, including a large diameter section area located at the bottom and a small diameter section area located at the top. The large diameter section area is located inside the external support member (50) and is placed on the vibration isolator (10). The small diameter section area extends from the top opening of the upper end surface of the external support member (50) to the outside, and is used to provide a mounting surface for the vibration isolator and the vibration-isolated equipment. The middle support member (30) is mounted on the outside of the vibration isolator (10). In most cases, the middle support member (30) is connected to the elastic base (100) when the elastic base (100) of the vibration isolator (10) is formed. The middle support member (30) can be made of metal or non-metal materials, and is a component that is hard and not easy to deform. The main function of the middle support member (30) is to provide sufficient radial stiffness to the elastic base (100) to prevent the elastic base (100) from deforming too much. The radial elastomer (40) is mounted on the outside of the middle support member (30) and is mainly used to provide radial vibration reduction performance for the vibration isolator. The radial elastomer (40) can be made of a rubber-like polymer material, or it can be foam, etc. A flange extending outward is provided at the bottom opening edge of the external support member (50), the flange is connected to the mounting base (60), and a plurality of first mounting holes (601) penetrating the mounting base (60) are processed at the flange, and the first mounting holes (601) are used to pass connecting bolts to connect the vibration isolator and the base.

[0057] like Figure 5 As shown, the present invention also provides another local resonance type rubber vibration isolator, comprising any one of the above-mentioned vibration isolators (10), an upper bearing mounting frame (70) and a lower bearing mounting frame (80). The upper bearing mounting frame (70) is a columnar structure, comprising a mounting hole or a mounting groove for connecting the vibration-isolated device, the vibration isolator (10) is arranged around the outer periphery of the upper bearing mounting frame (70), and the vibration isolator (10) is uniform in the circumferential direction and extends away from the upper bearing mounting frame (70) in the axial direction and radial direction of the upper bearing mounting frame (70), the lower bearing mounting frame (80) is arranged on a side of the vibration isolator (10) away from the upper bearing mounting frame (70), and the lower bearing mounting frame (80) is at least used to support the vibration isolator (10).

[0058] The upper bearing mounting frame (70) is a hollow cylinder, and the mounting hole or mounting groove is used for the installation of the vibration isolation equipment. The vibration isolation member (10) is a hollow tower-shaped, hemispherical or crown-shaped extension. The lower bearing mounting frame (80) is used to provide bearing support for the rubber vibration isolator and provide a mounting surface for the vibration isolator and the base. The lower bearing mounting frame (80) can be arranged outside the elastic base (100) or integrated into the elastic base (100). A second mounting hole (801) is provided on the lower bearing mounting frame (80), and the second mounting hole (801) is used to pass a bolt to connect the vibration isolator and the base. In most cases, the upper bearing mounting frame (70) and the lower bearing mounting frame (80) are connected to the elastic base (100) when the elastic base (100) is formed.

[0059] In the vibration isolator structure or vibration isolator (10) described above, when the local resonance vibrator (200) is spherical and made of uniform material, such as when the local resonance vibrator (200) is made of solid metal spheres, a wide band gap of 1000 Hz to 50000 Hz is obtained, which prevents the transmission of vibration within the band gap frequency, and theoretically obtains an extremely high vibration level drop, i.e., an additional vibration isolation effect of the vibration isolator. If the low-frequency performance of the vibration isolator needs to be further improved, a local resonance vibrator (200) with an internal configuration is required, i.e., the aforementioned structure with a central counterweight (210) is used, and a vibration isolation frequency as low as tens of hertz can be obtained. Figure 6 As shown in , the horizontal axis is Parameter K, Spinnig Irreduci ble Brillouin Zone, and the horizontal axis is the wave vector K along a high symmetry point or path in the irreducible Brillouin zone. Figure 7 The figure shows the relationship between the vibration level drop and the frequency in one embodiment of the present application.

[0060] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A vibration isolator, characterized in that: include: An elastic substrate (100); A plurality of local resonance vibrators (200), wherein the plurality of local resonance vibrators (200) are arranged in the elastic matrix (100), and the local resonance vibrators (200) at least include a resonance region, the elastic modulus of the resonance region is greater than the elastic modulus of the elastic matrix (100), and the density of the resonance region is greater than the density of the elastic matrix (100).

2. The vibration isolator according to claim 1, characterized in that: The material of the elastic matrix (100) includes a polymer material; The material of the elastic matrix (100) includes at least one of natural rubber, polyurethane, fluororubber, chlororubber, butyl rubber, silicone rubber, acrylic rubber, styrene-butadiene rubber, EPDM rubber, butadiene rubber, chloroprene rubber and blends or copolymer modifications thereof.

3. The vibration isolator according to claim 1, characterized in that: The number of the local resonance oscillators (200) is plural; The plurality of local resonance vibrators (200) are periodically and evenly dispersed within the elastic matrix (100).

4. The vibration isolator according to claim 1, characterized in that: The local resonance oscillator (200) is in the shape of a sphere, a polyhedron or an irregular shape.

5. The vibration isolator according to claim 1, characterized in that: The distance between the centers of gravity of adjacent local resonance vibrators (200) is not less than the maximum outer diameter of the local resonance vibrators (200), and the distance between the centers of gravity of adjacent local resonance vibrators (200) is not greater than five times the maximum outer diameter of the local resonance vibrators (200).

6. The vibration isolator according to claim 1, characterized in that: The resonance region is the entire region of the local resonance oscillator (200).

7. The vibration isolator according to claim 1, characterized in that: The local resonance oscillator (200) comprises a central counterweight (210), an elastic intermediate body (220) and a shell (230), wherein the shell (230) is located at the periphery of the central counterweight (210), the elastic intermediate body (220) is located between the shell (230) and the central counterweight (210), and the resonance region includes the entire region of the central counterweight (210).

8. The vibration isolator according to claim 7, characterized in that: The elastic modulus of the elastic intermediate (220) is smaller than the elastic modulus of the elastic base (100).

9. A local resonance type rubber vibration isolator, characterized in that: A vibration isolator (10) comprising any one of claims 1 to 8, and The bearing platform (20), the middle support member (30), the radial elastic body (40), the external support member (50) and the mounting base (60); The external support member (50) comprises a receiving cavity and a top opening and a bottom opening communicated with the receiving cavity, the vibration isolator (10) is located in the receiving cavity, the bearing platform (20) is arranged on the top side of the vibration isolator (10), and a part of the structure of the bearing platform (20) extends from the top opening to the outside of the external support member (50) for connecting to the vibration-isolated equipment; The middle support member (30) is sleeved on the outer periphery of the side wall of the vibration isolation member (10), and the radial elastic body (40) is located between the middle support member (30) and the outer support member (50); The mounting base (60) is connected to the external support member (50) and covers the bottom opening.

10. A local resonance type rubber vibration isolator, characterized in that: A vibration isolator (10) comprising any one of claims 1 to 8, and An upper load-bearing mounting frame (70) and a lower load-bearing mounting frame (80); The upper bearing mounting frame (70) is a columnar structure, comprising a mounting hole or a mounting groove for connecting a vibration-isolated device; the vibration isolating member (10) is arranged around the outer circumference of the upper bearing mounting frame (70), and the vibration isolating member (10) is uniform in the circumferential direction and extends away from the upper bearing mounting frame (70) in the axial direction and radial direction of the upper bearing mounting frame (70); the lower bearing mounting frame (80) is arranged on a side of the vibration isolating member (10) away from the upper bearing mounting frame (70), and the lower bearing mounting frame (80) is at least used to support the vibration isolating member (10).

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