High-temperature-resistant high-damping two-stage composite vibration isolator

Abstract

The application relates to a high-temperature-resistant high-damping two-stage composite vibration isolator and relates to the field of vibration and noise reduction design equipment, which comprises an outer shell, the bottom end of the outer shell is provided with a bottom plate, a rubber layer is arranged between the outer shell and the bottom plate, the top end of the outer shell is provided with a top end interface, the bottom end of the top end interface extends into the inner part of the outer shell, and a vibration isolation assembly is arranged in the inner part of the outer shell relative to the top end interface. The application has the advantages that the current high-temperature pipeline uses the metal spring vibration isolator structure, the damping is small, and the medium-high frequency vibration isolation effect is poor.

Description

Technical Field

[0001] This application relates to the field of vibration reduction and noise reduction design equipment, and in particular to a high-temperature resistant, high-damping, dual-stage composite vibration isolator. Background Technology

[0002] For facilities that rely on steam power for propulsion or power generation, the steam system is the primary source of vibration and noise. Previously, vibration and noise control of steam systems often focused solely on the system equipment. However, in recent years, with the deepening of relevant theoretical analysis and engineering practice, vibration and noise control of high-temperature steam pipelines has gradually gained attention. Pipelines are not only channels for transmitting equipment vibration, but they are also excitation sources of vibration and noise themselves. The flow velocity of steam in pipelines reaches 30-50 m / s, which can generate significant high-frequency excitation on the pipeline.

[0003] Rubber vibration isolators used in normal temperature pipelines cannot be directly applied to high-temperature steam pipelines, and their vibration isolation effect has reached a bottleneck, making further improvement difficult. Currently, metal spring vibration isolators are often used for vibration isolation in high-temperature steam pipelines. The elastic deformation of these isolators mainly comes from the metal helical spring, which exhibits a significant standing wave effect in the mid-to-high frequency range, leading to a decrease in vibration reduction capacity. Their structural damping mainly comes from the deformation of the metal damping block under spring compression. The metal damping material is made of foamed metal, which can provide good damping effect under low-frequency, large-displacement vibration conditions, but its damping dissipation capacity is weak under high-frequency, small-displacement vibration conditions. Summary of the Invention

[0004] To address the issues of low damping and poor vibration isolation performance in medium and high frequencies of metal spring vibration isolators currently used in high-temperature pipelines, this application provides a high-temperature resistant, high-damping, dual-stage composite vibration isolator.

[0005] This application provides a high-temperature resistant, high-damping, two-stage composite vibration isolator, which adopts the following technical solution:

[0006] A high-temperature resistant, high-damping, dual-stage composite vibration isolator includes a housing, a base plate at the bottom of the housing, a rubber layer between the housing and the base plate, a top interface at the top of the housing, the bottom end of the top interface extending into the interior of the housing, and a vibration isolation component disposed inside the housing relative to the top interface.

[0007] Optionally, the vibration isolation assembly includes an intermediate mass, with a gap between the top and bottom ends of the intermediate mass and the side wall of the housing. A first elastic element is vertically arranged at the end of the intermediate mass near the top interface, and a second elastic element is vertically arranged at the end of the intermediate mass away from the top interface. The end of the first elastic element away from the intermediate mass abuts against the top interface, and the end of the second elastic element away from the intermediate mass abuts against the housing.

[0008] Optionally, the intermediate mass has a first receiving groove relative to the first elastic member, the first elastic member is located inside the first receiving groove, the bottom wall of the top interface is spaced apart from the top wall of the intermediate mass, and the intermediate mass has a first limiting groove relative to the bottom end of the first elastic member, the first limiting groove being in communication with the first receiving groove.

[0009] Optionally, the intermediate mass has a second receiving groove relative to the second elastic member, the second elastic member is located inside the second receiving groove, the bottom wall of the intermediate mass is spaced apart from the inner bottom wall of the outer shell, and the intermediate mass has a second limiting groove relative to the top of the second elastic member, the second limiting groove being in communication with the second receiving groove.

[0010] Optionally, the top interface includes a vertically arranged connecting rod, the connecting rod is fixedly connected to a connecting top plate on the outside of the housing, the connecting rod is fixedly connected to a connecting bottom plate on the inside of the housing, and the housing has a clearance hole at a position relative to the connecting rod, with a gap between the housing and the connecting rod relative to the clearance hole.

[0011] Optionally, a third limiting groove is provided at the bottom end of the connecting base plate relative to the position of the first elastic member, and the top end of the first elastic member is located in the third limiting groove.

[0012] Optionally, a first snap-fit ​​groove is formed on the side of the rubber layer near the outer shell, and a first snap-fit ​​plate is fixedly connected to the outer shell relative to the first snap-fit ​​groove, with the first snap-fit ​​plate located within the first snap-fit ​​groove; a second snap-fit ​​groove is formed on the side of the rubber layer near the bottom plate, and a second snap-fit ​​plate is fixedly connected to the bottom plate relative to the second snap-fit ​​groove, with the second snap-fit ​​plate located within the second snap-fit ​​groove.

[0013] Optionally, the sidewall of the housing is provided with heat dissipation holes, and multiple heat dissipation holes are provided.

[0014] Optionally, the transfer efficiency formula is:

[0015]

[0016] Where: L is the transmission efficiency; f1 is the natural frequency of the upper layer of the dual-stage vibration isolation system; f2 is the natural frequency of the lower layer of the dual-stage vibration isolation system; f is the frequency point under investigation; and μ is the mass ratio of the upper and lower layers of the dual-stage vibration isolation system.

[0017] Optionally, the heat dissipation capacity of the housing, the top interface, and the vibration isolation assembly is greater than the heat dissipation capacity of the rubber layer.

[0018] In summary, this application includes at least one of the following beneficial technical effects:

[0019] 1. Compared with traditional vibration isolators, medium and high frequency vibration isolation is better and can be used in high-temperature pipelines.

[0020] 2. It has low weight and space requirements, simple structure, and is reliable and durable. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a high-temperature resistant, high-damping, dual-stage composite vibration isolator according to an embodiment of this application.

[0022] Figure 2 This is a cross-sectional view of a high-temperature resistant, high-damping, dual-stage composite vibration isolator according to an embodiment of this application.

[0023] Figure 3 This is a schematic diagram of the structure of the rubber layer of a high-temperature resistant, high-damping, dual-stage composite vibration isolator according to an embodiment of this application.

[0024] Figure 4 This is a schematic diagram of the top interface of a high-temperature resistant, high-damping, dual-stage composite vibration isolator according to an embodiment of this application.

[0025] Figure 5 This is a schematic diagram of the intermediate mass of a high-temperature, high-damping, two-stage composite vibration isolator according to an embodiment of this application.

[0026] Explanation of reference numerals in the attached drawings: 1. Base plate; 11. Second snap-fit ​​plate; 12. Clearance hole; 2. Rubber layer; 21. First snap-fit ​​groove; 22. Second snap-fit ​​groove; 3. Outer shell; 31. First snap-fit ​​plate; 32. Heat dissipation hole; 4. Top interface; 41. Connecting rod; 42. Connecting top plate; 43. Connecting base plate; 44. Third limiting groove; 5. Vibration isolation component; 51. Intermediate mass; 52. First receiving groove; 521. First limiting groove; 522. First spring; 53. Second receiving groove; 531. Second limiting groove; 532. Second spring. Detailed Implementation

[0027] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0029] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0030] This application discloses a high-temperature resistant, high-damping, dual-stage composite vibration isolator. (Refer to...) Figure 1 A high-temperature resistant, high-damping, dual-stage composite vibration isolator includes a base plate 1 at the bottom, a rubber layer 2 on top of the base plate 1, and a housing 3 vertically mounted on the side of the rubber layer 2 facing away from the base plate 1, completely separating the housing 3 from the base plate 1. A top interface 4 is vertically mounted at the top of the housing 3 for connecting to external equipment. The bottom end of the top interface 4 extends into the interior of the housing 3, and a vibration isolation component 5 is vertically mounted inside the housing 3, with its bottom end connected to the bottom end of the top interface 4, thereby damping the vibration of the top interface 4.

[0031] Reference Figure 2 , Figure 3 The top of the rubber layer 2 is provided with a first snap-fit ​​groove 21. The first snap-fit ​​groove 21 is an annular groove. A first snap-fit ​​plate 31 is fixedly connected to the bottom wall of the outer shell 3 at a position relative to the first snap-fit ​​groove 21. The first snap-fit ​​plate 31 extends into the interior of the first snap-fit ​​groove 21, and the bottom wall of the outer shell 3 abuts against the top wall of the rubber layer 2.

[0032] The bottom wall of the rubber layer 2 is provided with a second snap-fit ​​groove 22. The second snap-fit ​​groove 22 is an annular groove. A second snap-fit ​​plate 11 is fixedly connected at the top of the bottom plate 1 relative to the position of the second snap-fit ​​groove 22. The second snap-fit ​​plate 11 extends into the interior of the second snap-fit ​​groove 22, and the top wall of the bottom plate 1 abuts against and is fixed to the bottom wall of the rubber layer 2.

[0033] The relative connection between the first snap-fit ​​plate 31 and the first snap-fit ​​groove 21, and the relative connection between the second snap-fit ​​plate 11 and the second snap-fit ​​groove 22, increases the bonding area and improves the bonding strength. The vibration transmission path of the vibration isolator passes through the rubber layer 2, which can compensate for the low loss factor of the metal spring and improve the overall structural damping of the vibration isolator.

[0034] Reference Figure 2 , Figure 4 The outer shell 3 is a cylindrical hollow structure, and an avoidance hole 12 is provided on the top wall of the outer shell 3 at the position of the top interface 4. The avoidance hole 12 completely penetrates the top wall of the outer shell 3, and the top interface 4 extends into the interior of the outer shell 3 from the position of the avoidance hole 12.

[0035] The top interface 4 includes a vertically mounted connecting rod 41, which is coaxially mounted with the outer casing 3. A connecting top plate 42 is coaxially fixedly connected to the side wall of the connecting rod 41. The connecting top plate 42 has a circular structure and is located above the top wall of the outer casing 3. A gap is left between the bottom wall of the connecting top plate 42 and the top wall of the outer casing 3, and the diameter of the connecting top plate 42 is larger than the diameter of the clearance hole 12. A connecting bottom plate 43 is also coaxially fixedly connected to the side wall of the connecting rod 41. The connecting bottom plate 43 has a circular structure and is located inside the outer casing 3. A gap is left between the top wall of the connecting bottom plate 43 and the lower surface of the top wall of the outer casing 3. The diameter of the connecting bottom plate 43 is larger than the diameter of the clearance hole 12, and the diameter of the connecting bottom plate 43 is larger than the diameter of the connecting top plate 42.

[0036] The connecting top plate 42 is used for a fixed connection with the pipe clamps. The pipe clamps are tightly locked to the pipe, serving as support legs for the pipe. The installation position of this device and the rated load of the metal springs are determined based on the weight distribution of the pipe, especially the distribution of large components such as valves and metal bellows.

[0037] Reference Figure 2 , Figure 5 The vibration isolation component 5 includes an intermediate mass 51, which is a cylindrical structure. The intermediate mass 51 is coaxially arranged with the outer shell 3, and a gap is left between the top wall of the intermediate mass 51 and the lower surface of the top wall of the outer shell 3, and a gap is left between the bottom wall of the intermediate mass 51 and the upper surface of the bottom wall of the outer shell 3. The ratio of the intermediate mass 51 to the mass of the object being isolated affects the second natural frequency of the two-stage vibration isolation system. Provided there is sufficient clearance between the intermediate mass 51 and the outer shell 3, the second natural frequency can be adjusted by changing the volume of the intermediate mass 51 or by using metal materials of different densities, so that the excitation frequency of the equipment / pipeline is between or higher than the first and second natural frequencies, thus avoiding resonance. Adding the intermediate mass 51 significantly improves the vibration isolation effect in the mid-to-high frequency range compared to single-stage vibration isolation.

[0038] A first receiving groove 52 is vertically formed on the top wall of the intermediate mass 51. The first receiving groove 52 is an annular groove and is coaxially arranged with the intermediate mass 51. A first limiting groove 521 is also formed at the bottom end of the intermediate mass 51 located in the first receiving groove 52. The first limiting groove 521 is an annular groove and is relatively connected to the first receiving groove 52. The diameter of the first limiting groove 521 is smaller than the diameter of the first receiving groove 52.

[0039] A first spring 522 is vertically disposed inside the first receiving groove 52. The bottom end of the first spring 522 extends into the interior of the first limiting groove 521, and there is a gap between the side wall of the first spring 522 and the side wall of the first receiving groove 52. The top end of the first spring 522 extends out from the interior of the first receiving groove 52 and contacts the bottom wall of the connecting base plate 43.

[0040] A third limiting groove 44 is provided on the bottom wall of the connecting base plate 43 at the position relative to the first spring 522. The third limiting groove 44 is coaxially arranged with the connecting base plate 43, and the top end of the first spring 522 extends into the interior of the third limiting groove 44.

[0041] A second receiving groove 53 is vertically formed on the bottom wall of the intermediate mass 51. The second receiving groove 53 is an annular groove and is coaxially arranged with the intermediate mass 51. A second limiting groove 531 is also formed at the top of the intermediate mass 51 located in the second receiving groove 53. The second limiting groove 531 is an annular groove and is connected to the second receiving groove 53. The diameter of the second limiting groove 531 is smaller than the diameter of the second receiving groove 53.

[0042] A second spring 532 is vertically disposed inside the second receiving groove 53. The top end of the second spring 532 extends into the interior of the second limiting groove 531, and there is a gap between the side wall of the second spring 532 and the side wall of the second receiving groove 53. The bottom end of the second spring 532 extends out from the interior of the second receiving groove 53 and contacts the bottom wall of the outer casing 3.

[0043] Reference Figure 1 , Figure 2 The side wall of the outer casing 3 is provided with multiple heat dissipation holes 32. The heat dissipation holes 32 completely penetrate the side wall of the outer casing 3 and connect the interior of the outer casing 3 with the outside world, so as to dissipate heat from the interior of the outer casing 3.

[0044] The aforementioned outer shell 3, top interface 4, and vibration isolation component 5 are all made of metal material that facilitates heat dissipation and can be used in high-temperature environments. Due to the good heat dissipation effect of metal material, the rubber layer 2 can always be kept within its allowable operating temperature range.

[0045] The first and second natural frequencies of the two-stage vibration isolator are determined based on the main characteristic excitation frequencies of the high-temperature pipeline and its connected equipment. Taking this into consideration, the parameters of the metal spring and intermediate mass 51 are selected. After installation, the isolator, the isolated pipeline, the first spring 522, the intermediate mass 51, and the second spring 532 constitute a two-stage vibration isolation system.

[0046] The transmissibility formula for traditional vibration isolators is: ;

[0047] Where: L is the transmission efficiency; f is the frequency point under consideration; f n This is the natural frequency of a single-stage vibration isolation system.

[0048] The transmissibility formula for the two-stage vibration isolator in this application is:

[0049]

[0050] Where: L is the transmission efficiency; f1 is the natural frequency of the upper layer of the dual-stage vibration isolation system; f2 is the natural frequency of the lower layer of the dual-stage vibration isolation system; f is the frequency point under investigation; and μ is the mass ratio of the upper and lower layers of the dual-stage vibration isolation system.

[0051] Transmission rate of traditional vibration isolators The transmissivity of the dual-stage vibration isolator In other words, the higher the frequency f, the more obvious the advantage of the transmissivity of the dual-stage vibration isolator. Therefore, compared with traditional vibration isolators, this vibration isolator has a better mid-to-high frequency vibration isolation effect, and the vibration isolation effect can be improved by 5-10dB in the 10Hz-10kHz frequency band.

[0052] In this application, the term "multiple" refers to at least two or more, unless otherwise expressly defined. The terms "installed," "connected," "linked," and "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "linked" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A high-temperature resistant, high-damping, dual-stage composite vibration isolator, characterized in that: It includes an outer shell (3), a bottom plate (1) is provided at the bottom end of the outer shell (3), a rubber layer (2) is provided between the outer shell (3) and the bottom plate (1), a top interface (4) is provided at the top end of the outer shell (3), the bottom end of the top interface (4) extends into the interior of the outer shell (3), and a vibration isolation component (5) is provided inside the outer shell (3) relative to the top interface (4). The vibration isolation component (5) includes an intermediate mass (51). The top and bottom ends of the intermediate mass (51) are respectively spaced from the side wall of the outer shell (3). A first elastic element is vertically arranged at the end of the intermediate mass (51) near the top interface (4), and a second elastic element is vertically arranged at the end of the intermediate mass (51) away from the top interface (4). The end of the first elastic element away from the intermediate mass (51) abuts against the top interface (4), and the end of the second elastic element away from the intermediate mass (51) abuts against the outer shell (3). The intermediate mass (51) has a first receiving groove (52) relative to the first elastic member, the first elastic member is located inside the first receiving groove (52), the bottom wall of the top interface (4) is spaced from the top wall of the intermediate mass (51), the intermediate mass (51) has a first limiting groove (521) relative to the bottom end of the first elastic member, the first limiting groove (521) is in communication with the first receiving groove (52); the diameter of the first limiting groove (521) is smaller than the diameter of the first receiving groove (52); The intermediate mass (51) has a second receiving groove (53) relative to the second elastic member, the second elastic member is located inside the second receiving groove (53), the bottom wall of the intermediate mass (51) is spaced from the inner bottom wall of the outer shell (3), the intermediate mass (51) has a second limiting groove (531) relative to the top of the second elastic member, the second limiting groove (531) is in communication with the second receiving groove (53); the diameter of the second limiting groove (531) is smaller than the diameter of the second receiving groove (53); The top interface (4) includes a vertically arranged connecting rod (41). The connecting rod (41) is fixedly connected to a connecting top plate (42) on the outside of the outer shell (3). The connecting rod (41) is fixedly connected to a connecting bottom plate (43) inside the outer shell (3). The outer shell (3) has a clearance hole (12) at a position relative to the connecting rod (41). The outer shell (3) has a gap between the connecting rod (41) and the clearance hole (12). The bottom end of the connecting base plate (43) is provided with a third limiting groove (44) at the position of the first elastic member, and the top end of the first elastic member is located in the third limiting groove (44). The outer shell (3), top interface (4) and vibration isolation assembly (5) are all made of metal material that facilitates heat dissipation.

2. The high-temperature resistant, high-damping, dual-stage composite vibration isolator according to claim 1, characterized in that: The rubber layer (2) has a first snap-fit ​​groove (21) on the side near the outer shell (3), and the outer shell (3) is fixedly connected to a first snap-fit ​​plate (31) relative to the first snap-fit ​​groove (21), and the first snap-fit ​​plate (31) is located in the first snap-fit ​​groove (21); the rubber layer (2) has a second snap-fit ​​groove (22) on the side near the bottom plate (1), and the bottom plate (1) is fixedly connected to a second snap-fit ​​plate (11) relative to the second snap-fit ​​groove (22), and the second snap-fit ​​plate (11) is located in the second snap-fit ​​groove (22).

3. The high-temperature resistant, high-damping, dual-stage composite vibration isolator according to claim 1, characterized in that: The outer casing (3) has heat dissipation holes (32) on its side wall, and multiple heat dissipation holes (32) are provided.

4. The high-temperature resistant, high-damping, dual-stage composite vibration isolator according to any one of claims 1-3, characterized in that: The formula for transmission efficiency is: Where: L is the transmission efficiency; f1 is the natural frequency of the upper layer of the dual-stage vibration isolation system; f2 is the natural frequency of the lower layer of the dual-stage vibration isolation system; f is the frequency point under investigation; and μ is the mass ratio of the upper and lower layers of the dual-stage vibration isolation system.

5. The high-temperature resistant, high-damping, dual-stage composite vibration isolator according to any one of claims 1-3, characterized in that: The heat dissipation capacity of the outer shell (3), the top interface (4) and the vibration isolation component (5) is greater than that of the rubber layer (2).

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