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

Abstract

The invention relates to the field of vibration and noise reduction design equipment, in particular to a high-temperature-resistant high-damping two-stage composite vibration isolator which comprises a shell, a bottom plate is arranged at the bottom end of the shell, a rubber layer is arranged between the shell and the bottom plate, a top end connector is arranged at the top end of the shell, and the bottom end of the top end connector extends into the shell. A vibration isolation assembly is arranged in the shell relative to the top end connector. The metal spring vibration isolator has the advantages that the problems that a metal spring vibration isolator used for a current high-temperature pipeline is small in structural damping and poor in medium-high frequency vibration isolation effect are solved.

Description

Technical Field

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

[0002] For facilities that rely on steam power for propulsion or power generation, the steam system is the main source of vibration and noise. In the past, the vibration and noise control of steam systems often only focused on system equipment. In recent years, with the deepening of relevant theoretical analysis and engineering practice, the vibration and noise control of high-temperature steam pipelines has gradually received attention. The pipeline is not only a transmission channel for equipment vibration, but also an excitation source of vibration and noise. The flow rate of steam in the pipeline is 30-50m / s, which can produce outstanding high-frequency excitation effects on the pipeline.

[0003] The rubber isolators used in normal temperature pipelines cannot be directly applied to high-temperature steam pipelines, and the vibration isolation effect of rubber isolators has reached a bottleneck and is difficult to improve further. At present, metal spring isolators are often used for vibration isolation of high-temperature steam pipelines. The elastic deformation of this type of isolator mainly comes from the metal coil spring, which has an obvious standing wave effect in the medium and high frequency bands, resulting in a decrease in vibration reduction ability, while its structural damping mainly comes from the deformation of the spring-compressed metal damping block. The metal damping material is made of foam metal, which can have a good damping effect in low-frequency and large-displacement vibration conditions, but has a weak damping dissipation capacity in high-frequency and small-displacement vibration conditions. Summary of the invention

[0004] In order to solve the problem that the metal spring vibration isolator currently used in high-temperature pipelines has low structural damping and poor medium and high frequency vibration isolation effect, the present application provides a high-temperature resistant and high-damping two-stage composite vibration isolator.

[0005] The present application provides a high temperature resistant and high damping double-stage composite vibration isolator, which adopts the following technical solution:

[0006] A high-temperature resistant and high-damping double-stage composite vibration isolator comprises an outer shell, a bottom plate is arranged at the bottom end of the outer shell, a rubber layer is arranged between the outer shell and the bottom plate, a top interface is arranged at the top end of the outer shell, the bottom end of the top interface extends into the interior of the outer shell, and a vibration isolation component is arranged inside the outer shell relative to the top interface.

[0007] Optionally, the vibration isolation assembly includes an intermediate mass, the top and bottom ends of the intermediate mass are respectively spaced apart from the side walls of the outer shell, a first elastic member is vertically arranged at one end of the intermediate mass close to the top interface, a second elastic member is vertically arranged at one end of the intermediate mass away from the top interface, an end of the first elastic member away from the intermediate mass abuts against the top interface, and an end of the second elastic member away from the intermediate mass abuts against the outer shell.

[0008] Optionally, the intermediate mass is provided with a first accommodating groove relative to the first elastic member, the first elastic member is located inside the first accommodating groove, a distance is left between the bottom wall of the top interface and the top wall of the intermediate mass, the intermediate mass is provided with a first limiting groove relative to the bottom end of the first elastic member, and the first limiting groove is relatively connected to the first accommodating groove.

[0009] Optionally, the intermediate mass is provided with a second accommodating groove relative to the second elastic member, the second elastic member is located inside the second accommodating groove, a gap is left between the bottom wall of the intermediate mass and the inner bottom wall of the outer shell, and the intermediate mass is provided with a second limiting groove relative to the top end of the second elastic member, and the second limiting groove is relatively connected to the second accommodating groove.

[0010] Optionally, the top interface includes a vertically arranged connecting rod, the connecting rod is located outside the shell and fixedly connected to a connecting top plate, the connecting rod is located inside the shell and fixedly connected to a connecting bottom plate, an avoidance hole is opened in the shell at a position relative to the connecting rod, and a distance is left between the shell and the connecting rod relative to the avoidance hole.

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

[0012] Optionally, a first clipping groove is provided on a side of the rubber layer close to the shell, a first clipping plate is fixedly connected to the shell relative to the first clipping groove, and the first clipping plate is located in the first clipping groove; a second clipping groove is provided on a side of the rubber layer close to the bottom plate, a second clipping plate is fixedly connected to the bottom plate relative to the second clipping groove, and the second clipping plate is located in the second clipping groove.

[0013] Optionally, a side wall of the shell is provided with a heat dissipation hole, and a plurality of the 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 two-stage vibration isolation system; f2 is the natural frequency of the lower layer of the two-stage vibration isolation system; f is the inspection frequency point; μ is the mass ratio of the upper and lower layers of the two-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, the present application includes at least one of the following beneficial technical effects:

[0019] 1. Compared with traditional vibration isolators, medium and high frequency vibration isolation effects are better and can be used for high temperature pipelines.

[0020] 2. Less weight and space occupied, simple structure, reliable and durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a high-temperature resistant and high-damping double-stage composite vibration isolator in an embodiment of the present application.

[0022] Figure 2 It is a cross-sectional view of a high temperature resistant and high damping two-stage composite vibration isolator in an embodiment of the present application.

[0023] Figure 3 It is a schematic structural diagram of the rubber layer of a high temperature resistant and high damping double-stage composite vibration isolator in an embodiment of the present application.

[0024] Figure 4 It is a structural schematic diagram of the top interface of a high-temperature resistant and high-damping double-stage composite vibration isolator in an embodiment of the present application.

[0025] Figure 5 It is a structural schematic diagram of the intermediate mass of a high temperature resistant and high damping two-stage composite vibration isolator in an embodiment of the present application.

[0026] Explanation of the accompanying drawings: 1. bottom plate; 11. second clip-on plate; 12. avoidance hole; 2. rubber layer; 21. first clip-on groove; 22. second clip-on groove; 3. outer shell; 31. first clip-on plate; 32. heat dissipation hole; 4. top interface; 41. connecting rod; 42. connecting top plate; 43. connecting bottom plate; 44. third limiting groove; 5. vibration isolation assembly; 51. intermediate mass; 52. first accommodating groove; 521. first limiting groove; 522. first spring; 53. second accommodating groove; 531. second limiting groove; 532. second spring. DETAILED DESCRIPTION

[0027] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0029] The following is combined with Figure 1-5 This application is described in further detail.

[0030] The present application discloses a high temperature resistant and high damping double-stage composite vibration isolator. Figure 1 A high temperature resistant and high damping two-stage composite vibration isolator includes a bottom plate 1 at the bottom end, a rubber layer 2 is arranged above the bottom plate 1, a shell 3 is vertically arranged on the side of the rubber layer 2 facing away from the bottom plate 1, and the rubber layer 2 completely separates the shell 3 from the bottom plate 1. A top interface 4 is vertically arranged at the top of the shell 3, and the top interface 4 is used to be relatively connected to external equipment. The bottom end of the top interface 4 extends into the inside of the shell 3, and a vibration isolation component 5 is vertically arranged inside the shell 3. The bottom end of the vibration isolation component 5 is relatively connected to the bottom end of the top interface 4, so that the top interface 4 is damped by the vibration isolation component 5.

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

[0032] A second snap-in groove 22 is formed on the bottom wall of the rubber layer 2. The second snap-in groove 22 is an annular groove body, and a second snap-in plate 11 is fixedly connected to the top of the bottom plate 1 at a position relative to the second snap-in groove 22. The second snap-in plate 11 extends into the interior of the second snap-in groove 22, and the top wall of the bottom plate 1 is abutted and fixed to the bottom wall of the rubber layer 2.

[0033] The first clamping plate 31 is relatively connected to the first clamping groove 21, and the second clamping plate 11 is relatively connected to the second clamping groove 22, so as to increase the bonding area and improve the bonding strength. The vibration transmission path of the vibration isolator passes through the rubber layer 2, which can make up for the defect of 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 shell 3 is a cylindrical hollow structure, and an avoidance hole 12 is opened on the top wall of the shell 3 at a position relative to the top interface 4. The avoidance hole 12 completely penetrates the top wall of the shell 3, and the top interface 4 extends into the interior of the shell 3 from the position of the avoidance hole 12.

[0035] The top interface 4 includes a vertically arranged connecting rod 41, which is coaxially arranged with the housing 3. The side wall of the connecting rod 41 is coaxially fixedly connected with a connecting top plate 42, which is a circular structure, and the connecting top plate 42 is located above the top wall of the housing 3, and the bottom wall of the connecting top plate 42 is spaced apart from the top wall of the housing 3, and the diameter of the connecting top plate 42 is greater than the diameter of the avoidance hole 12. The side wall of the connecting rod 41 is also coaxially fixedly connected with a connecting bottom plate 43, which is a circular structure, and the connecting bottom plate 43 is located inside the housing 3, and the top wall of the connecting bottom plate 43 is spaced apart from the lower surface of the top wall of the housing 3, and the diameter of the connecting bottom plate 43 is greater than the diameter of the avoidance hole 12, and the diameter of the connecting bottom plate 43 is greater than the diameter of the connecting top plate 42.

[0036] The connecting top plate 42 is used to be relatively fixedly connected with the pipeline clamp, and the pipeline clamp is relatively locked with the pipeline to serve as a support for the pipeline. The installation position of the device and the rated load of the metal spring are determined according to the weight distribution of the pipeline, especially the distribution position of the concentrated large-mass components such as valves and metal bellows in the pipeline.

[0037] Reference Figure 2 , Figure 5 The vibration isolation assembly 5 includes an intermediate mass 51. The intermediate mass 51 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 mass of the intermediate mass 51 to the mass of the object to be isolated will affect the second-order natural frequency of the two-stage vibration isolation system. On the premise that there is a sufficient gap between the outer shell 3, the second-order natural frequency can be adjusted by adjusting the volume of the intermediate mass 51 or selecting metal materials of different densities, so that the excitation frequency of the equipment / pipeline is between the first and second order natural frequencies or higher than the second order natural frequency to avoid resonance. After adding the intermediate mass 51, the vibration isolation effect in the medium and high frequency bands is significantly improved compared with the single-stage vibration isolation.

[0038] A first accommodating groove 52 is vertically opened on the top wall of the intermediate mass 51. The first accommodating groove 52 is an annular groove body. The first accommodating groove 52 and the intermediate mass 51 are coaxially arranged. The intermediate mass 51 is also provided with a first limiting groove 521 at the bottom end of the first accommodating groove 52. The first limiting groove 521 is an annular groove body, and the first limiting groove 521 is relatively connected to the first accommodating groove 52. The diameter of the first limiting groove 521 is smaller than the diameter of the first accommodating groove 52.

[0039] A first spring 522 is vertically arranged inside the first receiving groove 52, the bottom end of the first spring 522 extends into the first limiting groove 521, and a distance is left 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 from the inside of the first receiving groove 52 and contacts the bottom wall of the connecting bottom plate 43.

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

[0041] A second accommodating groove 53 is vertically opened on the bottom wall of the intermediate mass 51, and the second accommodating groove 53 is an annular groove body. The second accommodating groove 53 and the intermediate mass 51 are coaxially arranged. The intermediate mass 51 is located at the top of the second accommodating groove 53 and a second limiting groove 531 is also opened. The second limiting groove 531 is an annular groove body, and the second limiting groove 531 is relatively connected to the second accommodating groove 53, and the diameter of the second limiting groove 531 is smaller than the diameter of the second accommodating groove 53.

[0042] A second spring 532 is vertically arranged inside the second receiving groove 53, the top end of the second spring 532 extends into the second limiting groove 531, and a gap is left 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 from the inside of the second receiving groove 53 and contacts the bottom wall of the housing 3.

[0043] Reference Figure 1 , Figure 2 The side wall of the shell 3 is provided with a plurality of heat dissipation holes 32 , which completely penetrate the side wall of the shell 3 , and the heat dissipation holes 32 relatively connect the interior of the shell 3 with the outside, so that the interior of the shell 3 is cooled through the heat dissipation holes 32 .

[0044] The above-mentioned shell 3, top interface 4 and vibration isolation component 5 are all made of metal materials that are easy to dissipate heat and can be used in high temperature environments; since metal materials have good heat dissipation effects, the rubber layer 2 can be ensured to always be within its allowable operating temperature range.

[0045] The first and second order natural frequencies of the two-stage vibration isolator are determined according to the main characteristic excitation frequency of the high temperature pipeline and its connected equipment. Based on this comprehensive consideration, the parameters of the metal spring and the intermediate mass 51 are selected. After the vibration isolator is installed, the vibration-isolated pipeline, the first spring 522, the intermediate mass 51, and the second spring 532 constitute a two-stage vibration isolation system. The transmission rate formula of the traditional vibration isolator is:

[0046] Where: L is the transmission efficiency; f is the inspection frequency; f n is the natural frequency of the single-stage vibration isolation system.

[0047] The transmissibility formula of the two-stage vibration isolator in this application is:

[0048]

[0049] Where: L is the transmission efficiency; f1 is the natural frequency of the upper layer of the two-stage vibration isolation system; f2 is the natural frequency of the lower layer of the two-stage vibration isolation system; f is the inspection frequency point; μ is the mass ratio of the upper and lower layers of the two-stage vibration isolation system.

[0050] The transmissibility of traditional vibration isolators is ∝1 / f 2 , and the transmissibility of the double-stage isolator is ∝1 / f 4 , that is, the higher the frequency f, the more obvious the advantage of the double-stage vibration isolator in terms of transmissibility. Therefore, compared with traditional vibration isolators, this vibration isolator has better vibration isolation effect in the medium and high frequencies. In the frequency band of 10Hz-10kHz, the vibration isolation effect can be improved by 5-10dB.

[0051] In this application, the term "plurality" means at least two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0052] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A high temperature resistant and high damping two-stage composite vibration isolator, characterized in that: The invention comprises a shell (3), a bottom plate (1) is arranged at the bottom end of the shell (3), a rubber layer (2) is arranged between the shell (3) and the bottom plate (1), a top end interface (4) is arranged at the top end of the shell (3), the bottom end of the top end interface (4) extends into the inside of the shell (3), and a vibration isolation component (5) is arranged inside the shell (3) relative to the top end interface (4).

2. The high temperature resistant and high damping double-stage composite vibration isolator according to claim 1 is characterized in that: The vibration isolation assembly (5) comprises an intermediate mass (51), the top and bottom ends of the intermediate mass (51) are spaced apart from the side walls of the outer shell (3), a first elastic member is vertically arranged at one end of the intermediate mass (51) close to the top interface (4), a second elastic member is vertically arranged at one end of the intermediate mass (51) away from the top interface (4), the end of the first elastic member away from the intermediate mass (51) abuts against the top interface (4), and the end of the second elastic member away from the intermediate mass (51) abuts against the outer shell (3).

3. The high temperature resistant and high damping double-stage composite vibration isolator according to claim 2 is characterized in that: The intermediate mass (51) is provided with a first receiving groove (52) relative to the first elastic member, the first elastic member is located inside the first receiving groove (52), a gap is left between the bottom wall of the top interface (4) and the top wall of the intermediate mass (51), the intermediate mass (51) is provided with a first limiting groove (521) at the bottom end relative to the first elastic member, and the first limiting groove (521) is relatively connected to the first receiving groove (52).

4. The high temperature resistant and high damping double-stage composite vibration isolator according to claim 2 is characterized in that: The intermediate mass (51) is provided with a second receiving groove (53) relative to the second elastic member, the second elastic member is located inside the second receiving groove (53), a gap is left between the bottom wall of the intermediate mass (51) and the inner bottom wall of the outer shell (3), the intermediate mass (51) is provided with a second limiting groove (531) at the top end relative to the second elastic member, and the second limiting groove (531) is relatively connected to the second receiving groove (53).

5. The high temperature resistant and high damping double-stage composite vibration isolator according to claim 2 is characterized in that: The top interface (4) comprises a vertically arranged connecting rod (41), wherein the connecting rod (41) is located outside the shell (3) and is fixedly connected to a connecting top plate (42), and the connecting rod (41) is located inside the shell (3) and is fixedly connected to a connecting bottom plate (43). The shell (3) is provided with an avoidance hole (12) at a position relative to the connecting rod (41), and a distance is left between the shell (3) and the connecting rod (41) relative to the avoidance hole (12).

6. The high temperature resistant and high damping double-stage composite vibration isolator according to claim 5 is characterized in that: A third limiting groove (44) is provided at the bottom end of the connecting bottom plate (43) at a position relative to the first elastic member, and the top end of the first elastic member is located in the third limiting groove (44).

7. The high temperature resistant and high damping double-stage composite vibration isolator according to claim 1 is characterized in that: A first clamping groove (21) is provided on a side of the rubber layer (2) close to the outer shell (3); a first clamping plate (31) is fixedly connected to the outer shell (3) relative to the first clamping groove (21); and the first clamping plate (31) is located in the first clamping groove (21); a second clamping groove (22) is provided on a side of the rubber layer (2) close to the bottom plate (1); a second clamping plate (11) is fixedly connected to the bottom plate (1) relative to the second clamping groove (22); and the second clamping plate (11) is located in the second clamping groove (22).

8. The high temperature resistant and high damping double-stage composite vibration isolator according to claim 1 is characterized in that: The side wall of the housing (3) is provided with a heat dissipation hole (32), and a plurality of the heat dissipation holes (32) are provided.

9. The high temperature resistant and high damping double-stage composite vibration isolator according to any one of claims 1 to 8, characterized in that: The transfer efficiency formula is: Where: L is the transmission efficiency; f1 is the natural frequency of the upper layer of the two-stage vibration isolation system; f2 is the natural frequency of the lower layer of the two-stage vibration isolation system; f is the inspection frequency point; μ is the mass ratio of the upper and lower layers of the two-stage vibration isolation system.

10. The high temperature resistant high damping double-stage composite vibration isolator according to any one of claims 1 to 8, characterized in that: The heat dissipation capabilities of the housing (3), the top interface (4) and the vibration isolation component (5) are greater than the heat dissipation capability of the rubber layer (2).

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