Multi-degree-of-freedom dynamic vibration absorber

Abstract

This invention relates to a multi-degree-of-freedom dynamic vibration absorber that is installed in a device that generates vibrations to reduce vibrations and noise. [Solution] For rotating machinery and other objects that experience resonance during operation, the vibration and natural frequency of the object are measured before shipment. A multi-degree-of-freedom dynamic vibration absorber is designed and installed targeting the frequency at which high vibrations are induced (operating frequency and multiple resonance frequencies), thereby achieving the effect of reducing vibration and noise.

Description

Technical Field

[0001] The present invention relates to a multi-degree-of-freedom dynamic vibration absorber installed in a device where vibration occurs to reduce vibration and noise.

Background Art

[0002] Recently, in order to control the occurrence of resonance where the natural frequency of the system coincides with the operating frequency due to a change in dynamic characteristics during the connection between an electric motor and a load, a single-degree-of-freedom dynamic vibration absorber has been installed to reduce vibration and noise.

[0003] Conventionally, mainly when the operating range changes for a dynamic vibration absorber for a single frequency or when resonance occurs at two or more different frequencies, a separate dynamic vibration absorber has been installed to reduce vibration and noise.

[0004] In particular, since a rubber is used for the dynamic vibration absorber for an electric motor, there is a problem that the vibration reduction effect in the high-frequency region is small. However, if the effect of the dynamic vibration absorber is not achieved after one design, redesign and remanufacture are required, and a solution for this is demanded.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention has been proposed to solve the above problems, and its object is to provide a new type of multi-degree-of-freedom dynamic vibration absorber that responds to the first degree of freedom under normal operating conditions and can respond to multiple degrees of freedom by manual adjustment in sections where variable operation or vibration increases.

Means for Solving the Problems

[0007] A multi-degree-of-freedom dynamic vibration absorber according to at least one embodiment of the present invention includes a base plate, a plurality of first dampers provided on the upper surface of the base plate, a first weight plate placed on top of the first dampers, a plurality of second dampers provided on the upper surface of the first weight plate, a second weight plate placed on top of the second dampers, a plurality of first elastic members that penetrate the first weight plate and connect the upper surface of the base plate and the lower surface of the second weight plate, at least one second elastic member provided between the base plate and the first weight plate, and a plurality of support portions provided on the side surface of the base plate so as to connect at least the base plate among the base plate, the first weight plate and the second weight plate.

[0008] In at least one embodiment of the present invention, the plurality of support parts include a pair of first support parts provided on both sides of the base plate, the first weight plate, and the second weight plate, and a pair of second support parts provided on both sides of the base plate, the first weight plate, and the second weight plate perpendicular to the pair of first support parts.

[0009] In at least one embodiment of the present invention, the pair of first support portions are formed with a plurality of first fixing portions that are spaced apart in the longitudinal direction.

[0010] In at least one embodiment of the present invention, the plurality of first fixing parts include a first bolt fastened to the side surface of the base plate, a second bolt fastened to the side surface of the first weight plate, and a third bolt fastened to the side surface of the second weight plate.

[0011] In at least one embodiment of the present invention, the pair of second support portions are formed with a plurality of second fixing portions that are spaced apart in the longitudinal direction.

[0012] In at least one embodiment of the present invention, the plurality of second fixing parts include a fourth bolt fastened to the side surface of the base plate, a fifth bolt fastened to the side surface of the first weight plate, and a sixth bolt fastened to the side surface of the second weight plate.

[0013] In at least one embodiment of the present invention, the invention further includes a cross-shaped support bar connecting one end of the pair of first support parts and the pair of second support parts to each other.

[0014] In at least one embodiment of the present invention, the base plate further includes a first post on its upper surface for fixing one end of the first elastic member, and the second weight plate further includes a second post on its lower surface for fixing the other end of the first elastic member.

[0015] In at least one embodiment of the present invention, the first weight plate further includes a first weight provided on its upper surface, and the second weight plate further includes a second weight provided on its upper surface.

[0016] In at least one embodiment of the present invention, the base plate, the first weight plate, the second weight plate, the first weight and the second weight are made of metal, and the first damper and the second damper are made of silicon.

[0017] In at least one embodiment of the present invention, the first elastic member is a tension spring, and the second elastic member is a compression spring. [Effects of the Invention]

[0018] According to embodiments of the present invention, for rotating machinery and other objects that experience resonance during operation, the vibration and natural frequency of the object are measured before shipment, and a multi-degree-of-freedom dynamic vibration absorber is designed and installed targeting frequencies that induce high vibrations (operating frequency and multiple resonance frequencies), thereby achieving the effect of reducing vibration and noise. [Brief explanation of the drawing]

[0019] [Figure 1] FIG. is a diagram showing a multi-degree-of-freedom dynamic vibration absorber according to at least one embodiment of the present invention. [Figure 2] FIG. is a diagram showing a state in which the multi-degree-of-freedom dynamic vibration absorber according to at least one embodiment of the present invention is disassembled. [Figure 3] FIG. is a diagram showing a process of fixing a base plate, a first weight plate, and a second weight plate to a support portion so that the multi-degree-of-freedom dynamic vibration absorber according to at least one embodiment of the present invention serves as a mass body. [Figure 4] FIG. is a diagram showing a process of fixing a base plate and a first weight plate to a support portion so that the multi-degree-of-freedom dynamic vibration absorber according to at least one embodiment of the present invention serves as a first-degree-of-freedom dynamic vibration absorber. [Figure 5] FIG. is a diagram showing a process of fixing a base plate and a second weight plate to a support portion so that the multi-degree-of-freedom dynamic vibration absorber according to at least one embodiment of the present invention serves as a first-degree-of-freedom dynamic vibration absorber.

BEST MODE FOR CARRYING OUT THE INVENTION

[0020] Hereinafter, the present invention will be described in detail through exemplary drawings. It should be noted that when adding reference numerals to the components of each drawing, the same components are given the same numerals as much as possible even if they are shown on other drawings.

[0021] In this specification, terms such as "first" and "second" can be used to describe various components, but these components are not limited in order, size, position, or importance by terms such as "first" and "second", and are named only for the purpose of distinguishing one component from another.

[0022] FIG. 1 is a diagram showing a multi-degree-of-freedom dynamic vibration absorber according to at least one embodiment of the present invention, and FIG. 2 is a diagram showing a state in which the multi-degree-of-freedom dynamic vibration absorber according to at least one embodiment of the present invention is disassembled.

[0023] A multi-degree-of-freedom dynamic vibration absorber according to at least one embodiment of the present invention is installed on a vibrating body that generates vibrations and reduces vibrations and noise.

[0024] A vibrating body can include anything that generates vibration, and in this context, a vibrating body may be a rotating machine.

[0025] In this embodiment, the rotating machine may be, for example, an electric motor.

[0026] Referring to Figures 1 and 2, the multi-degree-of-freedom dynamic vibration absorber of this embodiment includes a base plate 100, a first damper 180, a first weight plate 220, a second damper 200, a second weight plate 260, a first elastic member, a second elastic member, and a plurality of support parts.

[0027] The base plate 100 has a square plate shape.

[0028] The base plate 100 has multiple first damper holes 110 and first post holes 120 formed therein, so that the first damper 180 and the first post 310, which will be described later, can be installed.

[0029] The first damper hole 110 is formed on the corner side of the base plate 100.

[0030] Since the base plate 100 has four corners, the first damper holes 110 are formed at each of the four corners.

[0031] The base plate 100 has multiple elastic member mounting sections 150 formed in the center of its upper surface.

[0032] In this embodiment, there are four elastic member mounting sections 150, which can be arranged in a cross shape in the center of the base plate 100.

[0033] The elastic member mounting portion 150 has a spring coupling portion 160 at the top and a protruding portion 170 at the bottom.

[0034] The elastic member mounting portion 150 has a protruding portion 170 connected to a mounting hole 130 formed in the base plate 100.

[0035] The base plate 100 is provided with at least one connecting portion 140 on its lower surface for connecting a multi-degree-of-freedom dynamic vibration absorber to a vibrating body.

[0036] Multiple first dampers 180 are provided in the first damper holes 110 formed on the upper surface of the base plate 100.

[0037] Specifically, the first dampers 180 are positioned on each of the four corner sides of the base plate 100, with the four first dampers 180 located in the first damper holes 110.

[0038] The first damper 180 is cylindrical in shape, and the first coupling hole 190 is formed in the axial direction.

[0039] The first damper 180 may be made of a silicone material in this embodiment.

[0040] Depending on the embodiment, the first damper 180 may be made of rubber material instead of silicone.

[0041] The first damper 180 can be connected to the first weight plate 220, the second damper 200, and the second weight plate 260, which will be described later, by a single bolt 300 via the base plate 100.

[0042] The corners of the first weight plate 220 are placed on top of the four first dampers 180 described above.

[0043] The first weight plate 220 is a rectangular plate shape with the same size as the base plate 100, and its thickness may also be the same as the base plate 100. Therefore, the first weight plate 220 may also have the same weight as the base plate 100.

[0044] The first weight plate 220 has a second damper hole 230 formed in the same position as the first damper hole 110 formed in the base plate 100.

[0045] Furthermore, the first weight plate 220 has through holes 240 with a larger diameter than the first post holes 120 in the base plate 100, at the same positions as the first post holes 120.

[0046] The diameter of the through-hole 240 may be formed to be larger than the diameter of the first elastic member, which will be described later.

[0047] Multiple second dampers 200 are provided in the second damper holes 230 formed on the upper surface of the first weight plate 220.

[0048] Specifically, the second dampers 200 are arranged on each of the four corner sides of the base plate 100 by coupling four second dampers 200 into second damper holes 230.

[0049] The second damper 200 is cylindrical in shape, and a second coupling hole 210 is formed in the axial direction.

[0050] The second damper 200 may be made of a silicon material in this embodiment.

[0051] Depending on the embodiment, the second damper 200 may be made of rubber material instead of silicone.

[0052] The corners of the second weight plate 260 are placed on top of the four second dampers 200.

[0053] The second weight plate 260 is a rectangular plate shape with the same size as the base plate 100, and its thickness may also be the same as the base plate 100. Therefore, the second weight plate 260 may also have the same weight as the first weight plate 220 and the base plate 100.

[0054] The second weight plate 260 has a third damper hole 270 formed in it so as to be connected to the upper part of the second damper 200, which will be described later.

[0055] The base plate 100, first damper 180, first weight plate 220, second damper 200, and second weight plate 260 are connected by a single bolt 300 that sequentially passes through the third damper hole 270, second connecting hole 210, second damper hole 230, and first connecting hole 190, with the end of the bolt 300 connected to the first damper hole 110.

[0056] The second weight plate 260 has multiple second post holes 280 formed at the same positions as the first post holes 120 of the base plate 100, so that the second post 330, which will be described later, can be installed.

[0057] The first post 310 is installed on the underside of the second weight plate 260.

[0058] Multiple first elastic members are provided so as to pass through through holes 240 formed in the first weight plate 220 and connect the upper surface of the base plate 100 and the lower surface of the second weight plate 260.

[0059] In this embodiment, the first elastic member is provided one at a time between the corners.

[0060] At least one second elastic member is provided between the base plate 100 and the first weight plate 220. In this embodiment, four second elastic members are arranged in a cross shape in the center of the base plate 100, providing an elastic force that separates the base plate 100 and the first weight plate 220.

[0061] Multiple support sections selectively fix the base plate 100, the first weight plate 220, and the second weight plate 260.

[0062] The multiple support parts include a pair of first support parts 390 and a pair of second support parts 430.

[0063] A pair of first support parts 390 are provided on both sides of the base plate 100, the first weight plate 220, and the second weight plate 260.

[0064] Each pair of first support portions 390 has a plurality of first fixing portions formed at intervals along its length.

[0065] The multiple first fixing parts include multiple bolt holes 461 and first bolts 400, second bolts 410, and third bolts 420, which are inserted into the multiple bolt holes 461, respectively.

[0066] The first bolt 400 serves to fix the first support portion 390 to the side surface of the base plate 100.

[0067] The second bolt 410 serves to fix the first support portion 390 to the side of the first weight plate 220.

[0068] The third bolt 420 serves to fix the first support portion 390 to the side of the second weight plate 260.

[0069] The pair of second support parts 430 are installed on the base plate 100, the first weight plate 220, and the second weight plate 260, and are provided on both sides perpendicular to the pair of first support parts 390.

[0070] A pair of second support portions 430 are formed with a plurality of second fixing portions that are spaced apart in the longitudinal direction.

[0071] The multiple second fixing parts include multiple bolt holes 461 and a fourth bolt 440, a fifth bolt 450, and a sixth bolt 460, which are inserted into the multiple bolt holes 461, respectively.

[0072] The fourth bolt 440 serves to fix the second support portion 430 to the side surface of the base plate 100.

[0073] The fifth bolt 450 serves to fix the second support portion 430 to the side of the first weight plate 220.

[0074] The sixth bolt 460 serves to fix the second support portion 430 to the side of the second weight plate 260.

[0075] The multi-degree-of-freedom dynamic vibration absorber of the present invention further includes a cross-shaped support bar 470 that connects one end of each other such that a pair of first support parts 390 and a pair of second support parts 430 form a single piece.

[0076] The base plate 100 further includes a first post 310 that secures one end of the first elastic member to its upper surface.

[0077] The second weight plate 260 further includes a second post 330 that secures the other end of the first elastic member to its lower surface.

[0078] The first post 310 and the second post 330 each include a first adjustment bolt 320 and a second adjustment bolt 340, respectively, so that their lengths can be adjusted.

[0079] The first post 310 and the second post 330 can be adjusted in length to put the first elastic member into a preloaded state.

[0080] The first weight plate 220 can have the first weight 350 mounted on its upper surface.

[0081] The second weight plate 260 can be fitted with a second weight 370 on its upper surface.

[0082] In this embodiment, the first weight 350 and the second weight 370 may be rectangular parallelepiped in shape, and to facilitate connection, a first fastening bolt 360 and a second fastening bolt 380 may be formed on one side of the rectangular parallelepiped, respectively, and connected to the first fastening holes 250 and the second fastening holes 290 of the first weight plate 220 and the second weight plate 260.

[0083] In one embodiment, the first heavy object 350 and the second heavy object 370 may be cylindrical in shape.

[0084] The first heavy object 350 and the second heavy object 370 may be manufactured in multiple quantities of various sizes so that they can be replaced depending on the measured natural frequency.

[0085] The first elastic member may be a tensile spring 480.

[0086] The second elastic member may be a compression spring 490. Furthermore, the compression spring 490 may have a larger diameter than the tension spring 480.

[0087] The base plate 100, the first weight plate 220, the second weight plate 260, the first weight 350, and the second weight 370 may be made of metal.

[0088] Next, with reference to Figures 3 to 5, the process of selectively fixing the first weight plate 220 and the second weight plate 260 to the base plate 100 so that the multi-degree-of-freedom dynamic vibration absorber becomes a mass body, a first-degree-of-freedom dynamic vibration absorber, or a second-degree-of-freedom dynamic vibration absorber will be described.

[0089] Figure 3 shows the process of fixing the base plate 100, the first weight plate 220, and the second weight plate 260 to the support so that the multi-degree-of-freedom dynamic vibration absorber according to at least one embodiment of the present invention functions as a mass body. Figure 4 shows the process of fixing the base plate 100 and the first weight plate 220 to the support so that the multi-degree-of-freedom dynamic vibration absorber according to at least one embodiment of the present invention functions as a first-degree-of-freedom dynamic vibration absorber. Figure 5 shows the process of fixing the base plate 100 and the second weight plate 260 to the support so that the multi-degree-of-freedom dynamic vibration absorber according to at least one embodiment of the present invention functions as a first-degree-of-freedom dynamic vibration absorber.

[0090] In order to set up the multi-degree-of-freedom dynamic vibration absorber to function as a mass body, as shown in Figure 3, the base plate 100 is fixed with first bolts 400 formed on a pair of first support parts 390, the first weight plate 220 is fixed with second bolts 410, and the second weight plate 260 is fixed with third bolts 420.

[0091] Furthermore, to strengthen the fixing force, the base plate 100 is fixed with fourth bolts 440 formed on a pair of second support parts 430, the first weight plate 220 is fixed with fifth bolts 450, and the second weight plate 260 is fixed with sixth bolts 460.

[0092] As a result, when the base plate 100, the first weight plate 220, and the second weight plate 260 are fixed and the base plate 100 vibrates, the first weight plate 220 and the second weight plate 260 also vibrate in the same way, so the multi-degree-of-freedom dynamic vibration absorber can function as a mass body.

[0093] Next, in order to set up the multi-degree-of-freedom dynamic vibration absorber to function as a first-degree-of-freedom dynamic vibration absorber, as shown in Figure 4, the base plate 100 is fixed with the first bolts 400 formed on the pair of first support parts 390, and the first weight plate 220 is fixed with the second bolts 410. Here, the third bolt 420 does not fix the second weight plate 260.

[0094] Furthermore, to strengthen the fixing force, the base plate 100 is fixed with fourth bolts 440 formed on a pair of second support parts 430, and the first weight plate 220 is fixed with fifth bolts 450. Here, the sixth bolt 460 does not fix the second weight plate 260.

[0095] As a result, the base plate 100 and the first weight plate 220 are fixed, allowing the multi-degree-of-freedom dynamic vibration absorber to function as a first-degree-of-freedom dynamic vibration absorber. The first-degree-of-freedom dynamic vibration absorber is self-evident to those with ordinary knowledge, so a detailed explanation is omitted.

[0096] Finally, in order to set up the multi-degree-of-freedom dynamic vibration absorber to function as a second-degree-of-freedom dynamic vibration absorber, as shown in Figure 5, the base plate 100 is fixed with the first bolts 400 formed on the pair of first support parts 390, and the second weight plate 260 is fixed with the third bolts 420. Here, the second bolts 410 do not fix the first weight plate 220.

[0097] Furthermore, to strengthen the fixing force, the base plate 100 is fixed with fourth bolts 440 formed on a pair of second support parts 430, and the second weight plate 260 is fixed with sixth bolts 460. Here, the fifth bolt 450 does not fix the first weight plate 220.

[0098] As a result, the base plate 100 and the second weight plate 260 are fixed, allowing the multi-degree-of-freedom dynamic vibration absorber to function as a second-degree-of-freedom dynamic vibration absorber. The second-degree-of-freedom dynamic vibration absorber is self-evident to those with ordinary knowledge, so a detailed explanation is omitted.

[0099] The above description is merely illustrative of the technical concept of the present invention, and any person with ordinary skill in the art to which the present invention belongs can make various modifications and alterations without departing from the essential characteristics of the present invention.

[0100] For example, the embodiments described and illustrated above of the present invention can be combined with each other, and each embodiment may optionally further adopt or substitute some components of other embodiments as needed.

[0101] Therefore, the embodiments disclosed herein and in the drawings are for illustrative purposes only, and not to limit the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by such embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical concepts within an equivalent scope should be interpreted as being included within the scope of the present invention. [Explanation of Symbols]

[0102] 100: Base plate 110: First damper hole 120: First post hole 130: Mounting hole 140:Connection part 150: Elastic member mounting section 160: Spring joint 170:Protrusion 180: First Dump 190: 1st binding hole 200: Second Damper 210:Second coupling hole 220: First Weight Plate 230: Second damper hole 240: Through hole 250: 1st fastening hole 260: Second weight plate 270: Third damper hole 280: Second post hole 290:Second fastening hole 300: Bolts 310: First Post 320: First adjustment bolt 330: Second post 340: Second adjustment bolt 350: 1st heavy load 360: First fastening bolt 370:Second heavy load 380: Second fastening bolt 390: 1st support part 400: First bolt 410: Second bolt 420: Third bolt 430:Second support part 440: 4th bolt 450: 5th volt 460: 6th volt 461: Bolt hole 470: Cross-shaped support bar 480: Tension spring 490: Compression spring

Claims

1. base plate and A plurality of first dampers are provided on the upper surface of the base plate, A first weight plate is placed on top of the first damper, Multiple second dampers provided on the upper surface of the first weight plate, A second weight plate is placed on top of the second damper, A plurality of first elastic members that penetrate the first weight plate and connect the upper surface of the base plate and the lower surface of the second weight plate, At least one second elastic member provided between the base plate and the first weight plate, A multi-degree-of-freedom dynamic vibration absorber, comprising the base plate, the first weight plate, and the second weight plate, and a plurality of support parts provided on the side surface of the base plate so as to connect at least the base plate.

2. The aforementioned plurality of support parts are The base plate, the first weight plate, and a pair of first support portions provided on both sides of the second weight plate, A multi-degree-of-freedom dynamic vibration absorber according to claim 1, comprising a pair of second support parts provided on both sides of the base plate, the first weight plate, and the second weight plate, perpendicular to the pair of first support parts.

3. The pair of first support parts are, A multi-degree-of-freedom dynamic vibration absorber according to claim 2, wherein a plurality of first fixed parts are formed that are spaced apart in the longitudinal direction.

4. The plurality of first fixing parts are, A first bolt fastened to the side surface of the base plate, A second bolt fastened to the side of the first weight plate, A multi-degree-of-freedom dynamic vibration absorber according to claim 3, further comprising a third bolt fastened to the side surface of the second weight plate.

5. The pair of second support parts are, A multi-degree-of-freedom dynamic vibration absorber according to claim 2, wherein a plurality of second fixed parts are formed spaced apart in the longitudinal direction.

6. The plurality of second fixing parts are, A fourth bolt fastened to the side surface of the base plate, A fifth bolt fastened to the side surface of the first weight plate, The multi-degree-of-freedom dynamic vibration absorber according to claim 5, further comprising a sixth bolt fastened to the side surface of the second weight plate.

7. The multi-degree-of-freedom dynamic vibration absorber according to claim 2, further comprising a cross-shaped support bar connecting one end of the pair of first support parts and the pair of second support parts to each other.

8. The aforementioned base plate is The upper surface further includes a first post for fixing one end of the first elastic member, The aforementioned second weight plate is The multi-degree-of-freedom dynamic vibration absorber according to claim 1, further comprising a second post for fixing the other end of the first elastic member to its lower surface.

9. The first weight plate further includes a first weight provided on its upper surface, The multi-degree-of-freedom dynamic vibration absorber according to claim 1, wherein the second weight plate further includes a second weight provided on its upper surface.

10. The base plate, the first weight plate, the second weight plate, the first weight, and the second weight are made of metal. The multi-degree-of-freedom dynamic vibration absorber according to claim 9, wherein the first damper and the second damper are made of silicon material.

11. The first elastic member is a tension spring, The multi-degree-of-freedom dynamic vibration absorber according to claim 1, wherein the second elastic member is a compression spring.

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