A double-layer membrane type vibration absorber

Abstract

The present invention discloses a double-layer membrane type vibration absorber, comprising: a lower membrane assembly, a support ring, a mass block, an upper membrane assembly and a mass plate assembly; the outer shapes of the lower membrane assembly and the upper membrane assembly are cylindrical, the support ring is a cylindrical structure with openings at both ends, and the lower membrane assembly and the upper membrane assembly are respectively coaxially fixed at the axial two ends of the support ring; wherein, the lower membrane assembly and the upper membrane assembly are used to provide the stiffness required by the vibration absorber; the mass block is arranged inside the support ring and fixed between the lower membrane assembly and the upper membrane assembly; the mass plate assembly is fixed at the upper end of the upper membrane assembly; wherein, all the materials of the vibration absorber are metals.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration and noise control, and particularly to a double-layer membrane type vibration absorber. Background Art

[0002] The principle of a dynamic vibration absorber is to absorb the energy of the main system through its own resonance. This working principle determines that the natural frequency of the vibration absorber must be precisely set at the target line spectrum. A slight difference in the assembly pre-tightening force of the vibration absorber will cause the natural frequency of the vibration absorber to shift, thereby significantly reducing the vibration absorption effect. Traditional membrane type vibration absorbers have the advantages of small volume and compact structure, but also have two defects: one is that the membrane is very sensitive to the assembly state; the other is that the first-order mode is prone to the rotation of the mass block.

[0003] To overcome the above two disadvantages of the membrane type vibration absorber, it is necessary to provide a double-layer membrane type vibration absorber, in order to be able to reduce manufacturing errors, eliminate assembly errors and pre-tightening force errors, and ensure that the first-order mode is the axial translation of the mass block. Summary of the Invention

[0004] In view of this, the present invention provides a double-layer membrane type vibration absorber, which can significantly reduce manufacturing errors, eliminate assembly errors and pre-tightening force errors, and it is easy to ensure that the first-order mode is the axial translation of the mass block.

[0005] The technical solution of the present invention is: a double-layer membrane type vibration absorber, comprising: a lower membrane assembly, a support ring, a mass block, an upper membrane assembly and a mass sheet assembly;

[0006] The outer shapes of the lower membrane assembly and the upper membrane assembly are cylindrical, the support ring is a cylindrical structure with both ends open, and the lower membrane assembly and the upper membrane assembly are respectively coaxially fixed at the axial two ends of the support ring; wherein, the lower membrane assembly and the upper membrane assembly are used to provide the stiffness required by the vibration absorber;

[0007] The mass block is arranged inside the support ring and is fixed between the lower membrane assembly and the upper membrane assembly; the mass sheet assembly is fixed at the upper end of the upper membrane assembly; wherein, all the materials of this vibration absorber are metals.

[0008] Preferably, the lower membrane assembly is divided into three parts: an integrally formed lower support, a lower membrane and a lower connecting block, and the upper membrane assembly is divided into three parts: an integrally formed upper support, an upper membrane and an upper connecting block;

[0009] Both the lower support and the upper support are cylindrical structures, and stepped surfaces matching the lower support and the upper support are cut on the outer circumferential surfaces at both ends of the support ring; the lower support and the upper support are respectively coaxially sleeved at the axial two ends of the support ring, and are respectively fixed at the docking positions by more than two support ring fasteners;

[0010] The lower connecting block is located on the central axis of the lower support and is integrally formed with the inner wall surface of the lower support through a lower diaphragm located in the middle of the lower support axially; wherein, the lower diaphragm is used to provide the stiffness required for the shock absorber.

[0011] The upper connecting block is located on the central axis of the upper support and is integrally formed with the inner wall surface of the upper support through an upper diaphragm located in the middle of the upper support axially; wherein, the upper diaphragm is used to provide the stiffness required for the shock absorber.

[0012] Preferably, through holes are provided on the lower connecting block and the upper connecting block along the central axis of the support ring for fixing the lower connecting block and the upper connecting block to the mass block respectively through fasteners.

[0013] Preferably, counterbores are provided at the lower end of the through hole on the lower connecting block and the upper end of the through hole on the upper connecting block, and the fasteners for fixing the lower connecting block and the upper connecting block to the mass block are countersunk head screws.

[0014] Preferably, mounting lugs are provided on the outer circumferential surface at the lower end of the lower support for connecting with external equipment.

[0015] Preferably, more than two openings are provided on the lower diaphragm and the upper diaphragm respectively along the circumferential direction for adjusting the stiffness of the lower diaphragm and the upper diaphragm respectively.

[0016] Preferably, an annular groove is provided on the inner wall surface of the support ring.

[0017] Preferably, the mass block is cylindrical.

[0018] Preferably, the mass plate assembly is composed of more than one mass plate.

[0019] Preferably, each of the mass plates is circular.

[0020] Beneficial effects:

[0021] 1. The vibration absorber of the present invention has the following characteristics. In the first aspect, the vibration absorber can significantly reduce manufacturing errors, specifically manifested as follows: 1) Both the lower diaphragm assembly and the upper diaphragm assembly are integral structures, each processed from a single piece of material, ensuring the consistency of the materials of the vibration absorber; 2) The shape designs of the lower diaphragm assembly and the upper diaphragm assembly facilitate numerical control machining or casting and are produced by a set of procedures or a set of molds, eliminating the manufacturing errors of manual processing. In the second aspect, the vibration absorber eliminates assembly errors and pre-tightening force errors, mainly manifested as follows: 1) Both the lower diaphragm assembly and the upper diaphragm assembly are integral structures, without the need for assembly and without pre-tightening force; 2) When the mass plate assembly is disassembled and assembled, the pre-tightening force of the fasteners has no influence on the stiffness of the lower diaphragm assembly and the upper diaphragm assembly. In the third aspect, the vibration absorber is convenient for disassembly and assembly and has good environmental adaptability, mainly manifested as follows: 1) Using a common wrench tool, the vibration absorber can be disassembled and assembled on-site; 2) The vibration absorber is entirely made of metal and can adapt to various usage environments in ships. In the fourth aspect, the lower diaphragm assembly and the upper diaphragm assembly are respectively provided at both axial ends of the vibration absorber, greatly restricting the rotation of the mass block and making it easy to ensure that the first-order mode is the axial translation of the mass block (when there is only a single-layer diaphragm, due to the relatively large moment of inertia of the mass block relative to the diaphragm, the first-order mode of the vibration absorber is prone to the rotation of the mass block, which is not conducive to vibration absorption and translational vibration).

[0022] 2. In the present invention, the specific designs of the lower diaphragm assembly and the upper diaphragm assembly can not only effectively install the support ring and the mass block, but also ensure that diaphragms are provided at both axial ends of the vibration absorber, thereby providing the stiffness required by the vibration absorber.

[0023] 3. The counterbores provided on the upper and lower connecting blocks in the present invention are conducive to reducing the installation space of the fasteners.

[0024] 4. The hole designs on the upper and lower diaphragms in the present invention are conducive to adjusting the stiffness of the upper and lower diaphragms. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the assembly drawing of the vibration absorber of the present invention.

[0026] Figure 2 is the cross-sectional view of the vibration absorber of the present invention.

[0027] Wherein, 1. Lower diaphragm assembly, 2. Support ring fastener, 3. Support ring, 4. Mass block, 5. Upper diaphragm assembly, 6. Mass plate assembly, 7. Mass plate fastener, 8. Countersunk head screw, 1-1. Lower support, 1-2. Lower diaphragm, 1-3. Lower connecting block, 5-1. Upper support, 5-2. Upper diaphragm, 5-3. Upper connecting block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following are specific embodiments in conjunction with the drawings to describe the present invention in detail.

[0029] Example 1:

[0030] This example provides a double - layer membrane type vibration absorber, which can significantly reduce manufacturing errors, eliminate assembly errors and pre - tightening force errors, and it is easy to ensure that the first - order mode is the axial translation of the mass block.

[0031] As Figure 1 and Figure 2 shown, this vibration absorber includes: a lower diaphragm assembly 1, a support ring 3, a mass block 4, an upper diaphragm assembly 5, and a mass plate assembly 6; among them, the lower diaphragm assembly 1 is divided into three parts: an integrally formed lower support 1 - 1, a lower diaphragm 1 - 2, and a lower connecting block 1 - 3, and the upper diaphragm assembly 5 is divided into three parts: an integrally formed upper support 5 - 1, an upper diaphragm 5 - 2, and an upper connecting block 5 - 3;

[0032] The lower support 1 - 1, the upper support 5 - 1, and the support ring 3 are all cylindrical structures (which is beneficial to maintaining the axisymmetry of the vibration absorber, so as to keep the circumferential performance of the vibration absorber consistent), and an installation ear is provided on the outer circumferential surface at the lower end of the lower support 1 - 1 (facilitating the connection between the vibration absorber and external equipment), the support ring 3 has openings at both ends and stepped surfaces machined on the outer circumferential surfaces at both ends for mating with the lower support 1 - 1 and the upper support 5 - 1; the lower support 1 - 1 and the upper support 5 - 1 are respectively coaxially sleeved at both axial ends of the support ring 3 and are respectively fixed at the docking positions by more than two support ring fasteners 2;

[0033] The lower connecting block 1 - 3 is located on the central axis of the lower support 1 - 1 and is integrally formed with the inner wall surface of the lower support 1 - 1 through the lower diaphragm 1 - 2 located in the middle of the lower support 1 - 1 axially; among them, the lower diaphragm 1 - 2 is used to provide the stiffness required by the vibration absorber;

[0034] The upper connecting block 5 - 3 is located on the central axis of the upper support 5 - 1 and is integrally formed with the inner wall surface of the upper support 5 - 1 through the upper diaphragm 5 - 2 located in the middle of the upper support 5 - 1 axially; among them, the upper diaphragm 5 - 2 is used to provide the stiffness required by the vibration absorber;

[0035] The mass block 4 is arranged between the lower connecting block 1 - 3 and the upper connecting block 5 - 3, and the lower connecting block 1 - 3 and the upper connecting block 5 - 3 are respectively fixed to the mass block 4 through fasteners; among them, through - holes along the central axis of the support ring 3 are provided on the lower connecting block 1 - 3 and the upper connecting block 5 - 3. Preferably, counter - bores are provided at the lower end of the through - hole on the lower connecting block 1 - 3 and the upper end of the through - hole on the upper connecting block 5 - 3 coaxially. The fasteners for fixing the lower connecting block 1 - 3 and the upper connecting block 5 - 3 to the mass block 4 are countersunk head screws 8, which is beneficial to reducing the installation space of the fasteners;

[0036] The mass plate assembly 6 is fixed to the upper end of the upper connecting block 5 - 3 through a mass plate fastener 7; among them, all the materials of this vibration absorber are made of metal materials.

[0037] Embodiment 2:

[0038] Based on Embodiment 1, two or more openings are respectively provided circumferentially on the lower diaphragm 1-2 and the upper diaphragm 5-2, which are respectively used to adjust the stiffness of the lower diaphragm 1-2 and the upper diaphragm 5-2.

[0039] Embodiment 3:

[0040] Based on Embodiment 1 or 2, an annular groove is provided on the inner wall surface of the support ring 3, which can not only effectively reduce the weight of the support ring 3, but also keep the circumferential performance of the shock absorber consistent.

[0041] Embodiment 4:

[0042] Based on Embodiment 1 or 2 or 3, the mass block 4 is cylindrical, which is beneficial to ensuring that the mass of the shock absorber is consistent at any circumferential position.

[0043] Embodiment 5:

[0044] Based on any one of Embodiments 1-4, the mass plate assembly 6 is composed of one or more mass plates, and different numbers of mass plates can adjust different natural frequencies of the shock absorber; wherein, each mass plate is circular, so that the mass of the shock absorber is consistent at any circumferential position.

[0045] Embodiment 6:

[0046] Based on any one of Embodiments 1-5, chamfering design is carried out on the lower diaphragm assembly 1, which is beneficial to significantly reducing stress.

[0047] Embodiment 7:

[0048] Based on any one of Embodiments 1-6, the overall shape of the shock absorber can be changed from cylindrical to cuboid to meet more design requirements.

[0049] In summary, the above are only the preferred embodiments of the present invention, and are not used to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-layer membrane type vibration absorber, characterized in that, Including: A lower diaphragm assembly (1), a support ring (3), a mass block (4), an upper diaphragm assembly (5), and a mass plate assembly (6); The outer shapes of the lower diaphragm assembly (1) and the upper diaphragm assembly (5) are cylindrical, the support ring (3) is a cylindrical structure with openings at both ends, and the lower diaphragm assembly (1) and the upper diaphragm assembly (5) are respectively coaxially fixed at the axial two ends of the support ring (3); wherein, the lower diaphragm assembly (1) and the upper diaphragm assembly (5) are used to provide the stiffness required for the shock absorber; The mass block (4) is arranged inside the support ring (3) and is fixed between the lower diaphragm assembly (1) and the upper diaphragm assembly (5); the mass plate assembly (6) is fixed at the upper end of the upper diaphragm assembly (5); wherein, all the materials of this shock absorber are metals; The lower diaphragm assembly (1) is divided into three parts: an integrally formed lower support (1-1), a lower diaphragm (1-2), and a lower connecting block (1-3), and the upper diaphragm assembly (5) is divided into three parts: an integrally formed upper support (5-1), an upper diaphragm (5-2), and an upper connecting block (5-3); The lower support (1-1) and the upper support (5-1) are respectively coaxially sleeved at the axial two ends of the support ring (3) and are respectively fixed at the docking positions by more than two support ring fasteners (2); Through holes along the central axis of the support ring (3) are provided on the lower connecting block (1-3) and the upper connecting block (5-3) for respectively fixing the lower connecting block (1-3) and the upper connecting block (5-3) to the mass block (4) by fasteners; More than two openings are respectively provided on the lower diaphragm (1-2) and the upper diaphragm (5-2) along the circumferential direction for respectively adjusting the stiffness of the lower diaphragm (1-2) and the upper diaphragm (5-2).

2. The double-layer membrane type vibration absorber according to claim 1, characterized in that, Both the lower support (1-1) and the upper support (5-1) are cylindrical structures, and stepped surfaces matching the lower support (1-1) and the upper support (5-1) are cut on the outer circumferential surfaces at both ends of the support ring (3); The lower connecting block (1-3) is located on the central axis of the lower support (1-1) and is integrally formed with the inner wall surface of the lower support (1-1) through the lower diaphragm (1-2) at the middle part of the axial direction of the lower support (1-1); wherein, the lower diaphragm (1-2) is used to provide the stiffness required for the shock absorber; The upper connecting block (5-3) is located on the central axis of the upper support (5-1) and is integrally formed with the inner wall surface of the upper support (5-1) through the upper diaphragm (5-2) at the middle part of the axial direction of the upper support (5-1); wherein, the upper diaphragm (5-2) is used to provide the stiffness required for the shock absorber.

3. The double-layer membrane type vibration absorber according to claim 2, characterized in that, Counterbores are provided at the lower end of the through hole on the lower connecting block (1-3) and the upper end of the through hole on the upper connecting block (5-3), and the fastener for fixing the lower connecting block (1-3) and the upper connecting block (5-3) to the mass block (4) is a countersunk head screw (8).

4. The double-layer membrane type vibration absorber according to claim 2, characterized in that, Mounting lugs are provided on the outer circumferential surface at the lower end of the lower support (1-1) for connecting with external equipment.

5. The double-layer membrane type vibration absorber according to any one of claims 1-4, characterized in that, An annular groove is provided on the inner wall surface of the support ring (3).

6. The double-layer membrane type vibration absorber according to any one of claims 1-4, characterized in that, The mass block (4) is cylindrical.

7. The double-layer membrane type vibration absorber according to any one of claims 1-4, characterized in that, The mass plate assembly (6) is composed of more than one mass plate.

8. The double-layer membrane type vibration absorber according to claim 7, characterized in that, Each of the mass plates is circular.

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