WO2020116824A1 - Sealed dynamic vibration absorption device - Google Patents

Sealed dynamic vibration absorption device Download PDF

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Publication number
WO2020116824A1
WO2020116824A1 PCT/KR2019/015819 KR2019015819W WO2020116824A1 WO 2020116824 A1 WO2020116824 A1 WO 2020116824A1 KR 2019015819 W KR2019015819 W KR 2019015819W WO 2020116824 A1 WO2020116824 A1 WO 2020116824A1
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WO
WIPO (PCT)
Prior art keywords
vibration
damper
housing
tank
inner space
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PCT/KR2019/015819
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French (fr)
Korean (ko)
Inventor
이규호
박철준
Original Assignee
효성중공업 주식회사
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Publication of WO2020116824A1 publication Critical patent/WO2020116824A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/33—Arrangements for noise damping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/0207—Driving circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/28—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same

Definitions

  • the present invention relates to a closed-type copper suction device, and more particularly, to a closed-type copper suction device that reduces vibration and noise.
  • noise and vibration occur in devices that use electricity, such as transformers and reactors. Such noise and vibration have a great influence on the surroundings. Especially in the case of people living nearby, there is a problem of constantly being exposed to noise and vibration.
  • a natural frequency such as the frequency of vibration generated in a transformer on the outer surface of the tank constituting the exterior, such as in Korean Patent Registration Nos.
  • the branch tried to reduce noise and vibration by installing an attempted mass or by installing a sound insulation plate.
  • the copper suction device has a plate-shaped base 3 attached to the outer surface of the tank 1.
  • the stud bolt 1'protruding and fixed to the outer surface of the tank 1 penetrates the base 3 and is fastened to the nut 5 so that the base 3 is mounted on the outer surface of the tank 1. .
  • the base 3 has a damper 7, and a mass 9 having a natural frequency equal to the vibration frequency of the vibration generating source is installed on one surface of the damper 7 to reduce vibration generated on the outer surface of the tank 1 Attenuate to reduce noise.
  • An object of the present invention is to solve the conventional problems as described above, it is to provide a closed type copper suction device that can absorb and remove vibration and noise at the same time.
  • Another object of the present invention is to configure the copper suction device so that the main parts are not exposed to the outside.
  • the present invention includes a housing body in which an inner space is formed inside and a mounting flange that is formed around an inlet edge of the inner space of the housing body and mounted to a vibration generating source.
  • the housing, a damper installed on the inner surface of the inner space of the housing, and a mass body provided in the damper and generating the same frequency and natural frequency of vibration generated by the vibration generating source and generating vibration and reverse vibration from the vibration generating source It includes.
  • the housing is made of a metal material and transmits vibration generated from the vibration generating source to the damper.
  • a plurality of fastening holes are formed in the mounting flange, and fasteners installed on the outer surface of the vibration generating source penetrate.
  • the damper is made of rubber or epoxy or a spring is used.
  • the mass is made of a metal material and the widest surface is installed on the damper so as to face the vibration generating source.
  • the mass body has a plate shape.
  • the mass body mounted in the inner space of the housing vibrates to attenuate the vibration transmitted through the housing, and the vibration is directly reversed from the outer surface of the tank, and the phase is reversed to cancel each other to generate noise. There is an effect that can be avoided.
  • the housing constituting the exterior of the present invention includes a housing body having a predetermined internal space therein and a mounting flange formed around the portion where the internal space is opened in the housing body and mounted on the outer surface of the tank. Therefore, when the mounting flange is mounted on the outer surface of the tank, the inner space of the housing body is shielded from the outside, so that the damper and mass in the inner space are not exposed to the outside. Therefore, the important parts of the copper dust absorbing device are not exposed to the outside and are not affected by the external environment, thereby increasing durability.
  • the vibration transmitted to the housing is reduced to the outside of the tank as the housing is installed on the outer surface of the tank and transmitted to the damper and the mass body, the vibration transmission to the outside of the tank is also reduced by the housing, and thus the overall vibration of the tank. And the effect of reducing noise can be obtained.
  • FIG. 1 is a schematic cross-sectional view showing that a copper dust absorber according to the prior art is installed.
  • Figure 2 is a perspective view showing a preferred embodiment of the copper suction device according to the present invention.
  • Figure 3 is a cross-sectional perspective view showing the internal configuration of the embodiment shown in Figure 2;
  • Figure 4 is a cross-sectional view showing a state in which the copper suction device of the embodiment of the present invention is mounted on the outer surface of the transformer.
  • Figure 5 is an operating state showing that the vibration and noise is reduced in the embodiment of the present invention.
  • Figure 6 is a graph showing the magnitude of the vibration generated in the tank, the housing and the mass body in the present invention.
  • the housing 10 forms the exterior of the sealed copper exhaust device according to the present invention.
  • the housing 10 is composed of a housing body 12 and a mounting flange (14).
  • An inner space 13 is formed inside the housing body 12.
  • the inner space 13 is provided with a damper 20 and a mass body 22 to be described below.
  • the mounting flange 14 is formed around the edge corresponding to the entrance of the inner space 13 in the housing body 12.
  • the mounting flange 14 is formed to extend in a radial direction by a predetermined width from the outer surface of the housing body 12.
  • the mounting flange 14 is mounted on a fixed portion of the vibration generating source.
  • the mounting flange 14 is mounted on the outer surface of the tank 30 constituting the exterior of the transformer.
  • a plurality of fastening holes 16 are formed in the mounting flange 14.
  • the housing 10 constitutes the exterior of the device of the present invention to shield the internal parts from the outside, but also serves to transmit vibration generated from the vibration generating source to the damper 20 and the mass 22 described below. To this end, the natural frequency of the housing 10 is designed to be the same as the frequency of vibration from the vibration generating source.
  • the housing 10 is preferably made of a metal material, for example, steel.
  • the housing body 12 in the housing 10 has a cylindrical shape, but this is not necessarily the case.
  • the housing body 12 may be in various shapes such as a hexahedral shape.
  • a damper 20 is mounted on the inner surface 13 of the housing body 12.
  • the damper 20 is made of a material having a certain elasticity, for example, rubber or epoxy.
  • the damper 20 absorbs a part of the vibration transmitted through the housing body 12 while allowing the mass body 22 to be described below to vibrate.
  • the damper 20 may be made of an elastic member such as a spring.
  • the damper 20 is coupled to the inner space 13 of the housing body 12 facing the outer surface of the tank 30 to be described below, but this is not necessary.
  • a damper 20 may be installed on an inner surface that is a curved surface among the inner surfaces of the housing body 12.
  • the damper 20 may have a natural frequency equal to the frequency of vibration generated in the vibration generating source.
  • a mass body 22 is mounted on the damper 20.
  • the mass 22 is a metal plate of a predetermined shape.
  • steel may be exemplified.
  • the mass body 22 has a natural frequency equal to the frequency of the vibration generated in the vibration generating source.
  • the mass body 22 faces the outer surface of the tank 10 constituting the exterior of the transformer, which is a source of vibration in one state in the state installed in the inner space 13.
  • the portion facing the outer surface of the tank 10 in the mass 22 is the largest surface area.
  • the natural frequency of the mass 22 is the same as the frequency of the vibration generated in the transformer, which is the source of vibration, and must be made to generate vibration that is inversely related to the vibration from the tank 30.
  • a plurality of fasteners 32 are fixed and installed on the outer surface of the tank 30.
  • An example of the fastener 32 is a stud bolt.
  • the fastener 32 may be installed on the outer surface of the tank 30 through a method such as welding.
  • a nut 34 is fastened while the fastener 32 penetrates the mounting flange 14 of the housing 10 to tank the mounting flange 14 of the housing 10.
  • Reference numeral 36 is a flat washer
  • 38 is a spring washer is installed between the nut 34 and the mounting flange 14 to block the nut 34 from being loosened in the fastener 32 by vibration or the like.
  • the portion to which the damper 20 is attached to the housing body 12 in the housing 10 may be made of metal, and the rest may be made of rubber, epoxy, or elastic members.
  • the mounting flange 14 is made of metal. In this way, the housing body 12 can perform the role of copper exhaustion. Therefore, the dynamic absorption device is connected in series.
  • the apparatus of the present invention is used to be mounted on the tank 30 which is the appearance of the vibration generating source.
  • a plurality of fasteners 32 fixed to the tank 30 penetrate through fasteners 16 formed in the mounting flange 14 of the housing 10, and the nuts 34 are fastened to the fasteners 32 ) With the washers 36 and 38 posted.
  • the nut 34 is fastened to the fastener 32, the mounting flange 14 is brought into close contact with the outer surface of the tank 30.
  • the mounting flange 14 When the housing 10 is mounted on the tank 30, the mounting flange 14 is in close contact with the tank 30 and vibration transmitted to the outside of the tank 30 passes through the mounting flange 14 It is transferred to the housing body 12.
  • the damper 20 and the damper 20 are mounted on the mass body 22 facing the outer surface of the tank 30 ) Also vibrates.
  • the natural frequency of the mass 22 is the same as the frequency of vibration generated in the tank 30 and the phases are reversed. Accordingly, vibrations from the mass body 22 and vibrations from the tank 30 are canceled out and canceled.
  • vibrations transmitted from the tank 30 to the housing 10 are transmitted to the damper 20 and the mass body 22 while reducing vibrations and noise going out of the housing 10 and the mass body 22. ) And the vibrations from the tank 30 cancel each other out and disappear, and no noise is generated, thereby significantly reducing the overall noise generation.
  • the damper 20 and the mass body 22 are installed in the inner space 13 of the housing 10 made of metal.
  • the housing 10 is mounted on the tank 30, since the inner space 13 is shielded from the outside, the external environment is not transmitted to the damper 20 or the mass body 22, so the damper 20 or the mass body ( The damage caused by the environment of 22) hardly occurs.
  • the intensity of vibration is reduced most when the frequency is 120 Hz in the tank 30, and the intensity of vibration is also reduced at 120 Hz in the housing 10.
  • the intensity of vibration increases, but in the meantime, it is relatively low. This is because the mass 22 is vibrated by the vibration transmitted through the housing 10 and counteracts the vibration from the tank 30, so that the intensity of vibration is maintained at a value above a certain level.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Power Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

The present invention relates to a sealed dynamic vibration absorption device. A housing (10) forms the exterior of the present invention. The housing (10) comprises a housing body (12) having an inner space (13), and a mount flange (14) formed around the edge of the entrance of the inner space (13) in the housing body (12). A mass body (22) is provided in the inner space (13) so as to face a tank (30) for forming the exterior of a vibration source, and the mass body (22) is provided on a damper (20) mounted on the inner surface of the inner space (13). The mass body (22) has a natural frequency that is the same as the frequency of the vibrations generated from the vibration source and generates vibrations of a phase inverse to that of the vibrations generated from the vibration source. According to the present invention, vibration and noise can be more reliably removed, and the damper (20) and the mass body (22) can be reliably protected from the external environment.

Description

밀폐형 동흡진장치Closed copper exhaust system
본 발명은 밀폐형 동흡진장치에 관한 것으로, 더욱 상세하게는 진동과 소음을 줄여주는 밀폐형 동흡진장치에 관한 것이다.The present invention relates to a closed-type copper suction device, and more particularly, to a closed-type copper suction device that reduces vibration and noise.
예를 들어 변압기나 리액터 등 전기를 사용하는 장치에서는 소음과 진동이 발생한다. 이와 같은 소음과 진동은 주변에 많은 영향을 미치게 된다. 특히 인근에 거주하는 사람들의 경우에는 지속적으로 소음과 진동에 노출되는 문제가 있다.For example, noise and vibration occur in devices that use electricity, such as transformers and reactors. Such noise and vibration have a great influence on the surroundings. Especially in the case of people living nearby, there is a problem of constantly being exposed to noise and vibration.
이와 같은 소음과 진동을 줄여주기 위해서 다양한 시도들이 이루어지고 있다. 예를 들어 진동발생원의 하나인 변압기에서는 외관을 구성하는 탱크에 선행문헌인 대한민국 등록특허 10-0961255호나 대한민국 등록특허 10-20714호에서와 같이 외면에 변압기에서 발생하는 진동의 주파수와 같은 고유진동수를 가지는 시도질량을 설치하거나 차음판을 설치하여 소음과 진동을 줄이려 하였다.Various attempts have been made to reduce noise and vibration. For example, in a transformer that is one of the sources of vibration, a natural frequency such as the frequency of vibration generated in a transformer on the outer surface of the tank constituting the exterior, such as in Korean Patent Registration Nos. The branch tried to reduce noise and vibration by installing an attempted mass or by installing a sound insulation plate.
그리고, 도 1에 도시된 바와 같이, 예를 들면 변압기의 탱크(1) 외면에 동흡진장치가 장착되어 진동을 흡수하여 소음을 줄이는 방식의 종래 기술이 있었다. 동흡진장치는 탱크(1)의 외면에 부착되는 판상의 베이스(3)가 있다. 상기 탱크(1)의 외면에 돌출되어 고정된 스터드볼트(1')가 상기 베이스(3)를 관통하여 너트(5)와 체결됨에 의해 상기 베이스(3)가 탱크(1)의 외면에 장착된다. 상기 너트(5)와 베이스(3)의 사이에는 와셔(5')들이 있다.And, as shown in Figure 1, for example, there is a prior art of a method of reducing noise by absorbing vibrations by installing a copper absorber on the outer surface of the tank 1 of the transformer. The copper suction device has a plate-shaped base 3 attached to the outer surface of the tank 1. The stud bolt 1'protruding and fixed to the outer surface of the tank 1 penetrates the base 3 and is fastened to the nut 5 so that the base 3 is mounted on the outer surface of the tank 1. . There are washers 5'between the nut 5 and the base 3.
상기 베이스(3)에는 댐퍼(7)가 있고, 상기 댐퍼(7)의 일면에는 진동발생원의 진동 주파수와 동일한 고유진동수를 가지는 질량체(9)가 설치되어 탱크(1)의 외면에서 발생하는 진동을 감쇠시켜 소음을 줄이도록 한다. The base 3 has a damper 7, and a mass 9 having a natural frequency equal to the vibration frequency of the vibration generating source is installed on one surface of the damper 7 to reduce vibration generated on the outer surface of the tank 1 Attenuate to reduce noise.
하지만, 이와 같은 시도에 의해서는 어느 정도의 소음과 진동을 줄일 수는 있지만, 현저한 효과를 제공할 수 있을 정도는 아니었다.However, although some noise and vibration can be reduced by such an attempt, it was not enough to provide a remarkable effect.
그리고, 종래 기술들에서는 소음과 진동을 제거하기 위한 구성인 댐퍼(7)와 질량체(9)가 외부로 노출되어 있어서, 변압기와 같이 늘 실외에 노출되어 있는 환경인 경우에 내구성이 떨어지게 되는 문제점도 있다.In addition, in the prior art, since the damper 7 and the mass body 9, which are components for removing noise and vibration, are exposed to the outside, durability may be deteriorated when the environment is always exposed outdoors, such as a transformer. have.
본 발명의 목적은 상기한 바와 같은 종래의 문제점을 해결하기 위한 것으로, 진동과 소음을 동시에 흡수하고 제거할 수 있는 밀폐형 동흡진장치를 제공하는 것이다.An object of the present invention is to solve the conventional problems as described above, it is to provide a closed type copper suction device that can absorb and remove vibration and noise at the same time.
본 발명의 다른 목적은 주요 부품이 외부로 노출되지 않도록 동흡진장치를 구성하는 것이다.Another object of the present invention is to configure the copper suction device so that the main parts are not exposed to the outside.
상기한 바와 같은 목적을 달성하기 위한 본 발명의 특징에 따르면, 본 발명은 내부에 내부공간이 형성되는 하우징본체와 상기 하우징본체의 내부공간 입구 가장자리를 둘러 형성되어 진동발생원에 장착되는 장착플랜지를 구비하는 하우징과, 상기 하우징의 내부공간 내면에 설치되는 댐퍼와, 상기 댐퍼에 구비되고 상기 진동발생원에서 발생하는 진동의 주파수와 고유진동수가 동일하고 상기 진동발생원에서 나오는 진동과 역상의 진동을 발생시키는 질량체를 포함한다.According to the features of the present invention for achieving the above object, the present invention includes a housing body in which an inner space is formed inside and a mounting flange that is formed around an inlet edge of the inner space of the housing body and mounted to a vibration generating source. The housing, a damper installed on the inner surface of the inner space of the housing, and a mass body provided in the damper and generating the same frequency and natural frequency of vibration generated by the vibration generating source and generating vibration and reverse vibration from the vibration generating source It includes.
상기 하우징은 금속재질로 만들어지는 것으로 상기 진동발생원에서 발생하는 진동을 상기 댐퍼로 전달한다.The housing is made of a metal material and transmits vibration generated from the vibration generating source to the damper.
상기 장착플랜지에는 체결공이 다수개 형성되어 상기 진동발생원의 외면에 설치된 체결구가 관통한다.A plurality of fastening holes are formed in the mounting flange, and fasteners installed on the outer surface of the vibration generating source penetrate.
상기 댐퍼는 고무나 에폭시로 만들어지거나 스프링이 사용된다.The damper is made of rubber or epoxy or a spring is used.
상기 질량체는 금속재질로 만들어지고 가장 넓은 표면이 상기 진동발생원과 마주보게 상기 댐퍼에 설치된다.The mass is made of a metal material and the widest surface is installed on the damper so as to face the vibration generating source.
상기 질량체는 판형상으로 된다.The mass body has a plate shape.
본 발명에 의한 밀폐형 동흡진장치에서는 다음과 같은 효과를 얻을 수 있다.In the sealed copper exhaust device according to the present invention, the following effects can be obtained.
본 발명에서는 하우징의 내부공간에 장착된 질량체가 하우징을 통해 전달된 진동을 감쇠하기 위한 진동을 하는데, 이 진동은 탱크의 외면으로부터 바로 전달되는 진동과 위상이 역상으로 되어 있어 서로 상쇄되어 소음이 발생하지 않도록 할 수 있는 효과가 있다.In the present invention, the mass body mounted in the inner space of the housing vibrates to attenuate the vibration transmitted through the housing, and the vibration is directly reversed from the outer surface of the tank, and the phase is reversed to cancel each other to generate noise. There is an effect that can be avoided.
본 발명의 외관을 구성하는 하우징은 내부에 소정의 내부공간을 가지는 하우징본체와 상기 하우징본체에서 상기 내부공간이 개구된 부분을 둘러 형성되어 탱크의 외면에 장착되는 장착플랜지를 포함한다. 따라서 상기 장착플랜지를 탱크의 외면에 장착하면 상기 하우징본체의 내부공간이 외부와 차폐되면서 내부공간에 있는 댐퍼와 질량체가 외부로 노출되지 않게 된다. 따라서, 동흡진장치의 중요부품이 외부로 노출되지 않게 되어 외부 환경의 영향을 받지 않게 되어 내구성이 높아지는 효과가 있다.The housing constituting the exterior of the present invention includes a housing body having a predetermined internal space therein and a mounting flange formed around the portion where the internal space is opened in the housing body and mounted on the outer surface of the tank. Therefore, when the mounting flange is mounted on the outer surface of the tank, the inner space of the housing body is shielded from the outside, so that the damper and mass in the inner space are not exposed to the outside. Therefore, the important parts of the copper dust absorbing device are not exposed to the outside and are not affected by the external environment, thereby increasing durability.
그리고, 본 발명에서 하우징이 탱크의 외면에 설치됨에 의해 하우징으로 전달된 진동이 댐퍼와 질량체로 전달되면서 탱크 외부로 방출되는 것이 줄어 들게 되므로 하우징에 의해서도 탱크 외부로의 진동전달이 줄어들면서 탱크 전체적인 진동과 소음이 줄어드는 효과를 얻을 수 있다.In addition, since the vibration transmitted to the housing is reduced to the outside of the tank as the housing is installed on the outer surface of the tank and transmitted to the damper and the mass body, the vibration transmission to the outside of the tank is also reduced by the housing, and thus the overall vibration of the tank. And the effect of reducing noise can be obtained.
도 1은 종래 기술에 의한 동흡진장치가 설치되어 있는 것을 보인 개략 단면도.1 is a schematic cross-sectional view showing that a copper dust absorber according to the prior art is installed.
도 2는 본 발명에 의한 동흡진장치의 바람직한 실시례를 보인 사시도.Figure 2 is a perspective view showing a preferred embodiment of the copper suction device according to the present invention.
도 3은 도 2에 도시된 실시례의 내부 구성을 보인 단면사시도.Figure 3 is a cross-sectional perspective view showing the internal configuration of the embodiment shown in Figure 2;
도 4는 본 발명 실시례의 동흡진장치가 변압기의 탱크외면에 장착된 상태를 보인 단면도.Figure 4 is a cross-sectional view showing a state in which the copper suction device of the embodiment of the present invention is mounted on the outer surface of the transformer.
도 5는 본 발명 실시례에서 진동과 소음이 저감되는 것을 보인 동작상태도.Figure 5 is an operating state showing that the vibration and noise is reduced in the embodiment of the present invention.
도 6은 본 발명에서 탱크, 하우징 그리고 질량체에 발생하는 진동의 크기를 보인 그래프.Figure 6 is a graph showing the magnitude of the vibration generated in the tank, the housing and the mass body in the present invention.
이하, 본 발명의 일부 실시례들을 예시적인 도면을 통해 상세하게 설명한다. 각 도면의 구성요소들에 참조부호를 부가함에 있어서, 동일한 구성요소들에 대해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 부호를 가지도록 하고 있음에 유의해야 한다. 또한, 본 발명의 실시례를 설명함에 있어, 관련된 공지구성 또는 기능에 대한 구체적인 설명이 본 발명의 실시례에 대한 이해를 방해한다고 판단되는 경우에는 그 상세한 설명은 생략한다.Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. It should be noted that in adding reference numerals to the components of each drawing, the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, in describing embodiments of the present invention, when it is determined that detailed descriptions of related well-known structures or functions interfere with understanding of the embodiments of the present invention, detailed descriptions thereof will be omitted.
또한, 본 발명의 실시례의 구성 요소를 설명하는 데 있어서, 제 1, 제 2, A, B, (a), (b) 등의 용어를 사용할 수 있다. 이러한 용어는 그 구성 요소를 다른 구성 요소와 구별하기 위한 것일 뿐, 그 용어에 의해 해당 구성 요소의 본질이나 차례 또는 순서 등이 한정되지 않는다. 어떤 구성 요소가 다른 구성요소에 "연결", "결합" 또는 "접속"된다고 기재된 경우, 그 구성 요소는 그 다른 구성요소에 직접적으로 연결되거나 접속될 수 있지만, 각 구성 요소 사이에 또 다른 구성 요소가 "연결", "결합" 또는 "접속"될 수도 있다고 이해되어야 할 것이다.In addition, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), and the like can be used. These terms are only for distinguishing the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to the other component, but another component between each component It should be understood that may be "connected", "coupled" or "connected".
도면들에 도시된 바에 따르면, 본 발명에 의한 밀폐형 동흡진장치의 외관을 하우징(10)이 형성한다. 상기 하우징(10)은 하우징본체(12)와 장착플랜지(14)로 구성된다. 상기 하우징본체(12)의 내부에는 내부공간(13)이 형성된다. 상기 내부공간(13)에는 아래에서 설명될 댐퍼(20)와 질량체(22)가 설치된다.According to the drawings, the housing 10 forms the exterior of the sealed copper exhaust device according to the present invention. The housing 10 is composed of a housing body 12 and a mounting flange (14). An inner space 13 is formed inside the housing body 12. The inner space 13 is provided with a damper 20 and a mass body 22 to be described below.
상기 장착플랜지(14)는 상기 하우징본체(12)에서 상기 내부공간(13)의 입구에 해당되는 가장자리를 둘러서 형성된다. 상기 장착플랜지(14)는 상기 하우징본체(12)의 외면에서 소정 폭만큼 방사방향으로 연장되어 형성된다. 상기 장착플랜지(14)는 진동발생원의 고정부에 장착되는 것이다. 본 실시례에서는 도 4에서 볼 수 있는 바와 같이 예를 들면 변압기의 외관을 구성하는 탱크(30)의 외면에 상기 장착플랜지(14)가 장착된다. 이를 위해 상기 장착플랜지(14)에는 체결공(16)이 다수개 형성된다.The mounting flange 14 is formed around the edge corresponding to the entrance of the inner space 13 in the housing body 12. The mounting flange 14 is formed to extend in a radial direction by a predetermined width from the outer surface of the housing body 12. The mounting flange 14 is mounted on a fixed portion of the vibration generating source. In this embodiment, as can be seen in Figure 4, for example, the mounting flange 14 is mounted on the outer surface of the tank 30 constituting the exterior of the transformer. To this end, a plurality of fastening holes 16 are formed in the mounting flange 14.
상기 하우징(10)은 본 발명 장치의 외관을 구성하여 내부의 부품을 외부와 차폐하기도 하지만, 아래에서 설명될 댐퍼(20)와 질량체(22)로 진동발생원에서 발생한 진동을 전달하는 역할도 한다. 이를 위해 상기 하우징(10)의 고유진동수는 상기 진동발생원에서 나오는 진동의 주파수와 같도록 설계된다. 상기 하우징(10)은 금속재질로 만들어지는 것이 좋은데, 예를 들면 스틸(steel)이다.The housing 10 constitutes the exterior of the device of the present invention to shield the internal parts from the outside, but also serves to transmit vibration generated from the vibration generating source to the damper 20 and the mass 22 described below. To this end, the natural frequency of the housing 10 is designed to be the same as the frequency of vibration from the vibration generating source. The housing 10 is preferably made of a metal material, for example, steel.
본 실시례에서는 상기 하우징(10)에서 상기 하우징본체(12)가 원통형상으로 되어 있으나, 반드시 그러한 것은 아니다. 상기 하우징본체(12)가 육면체 형상 등 다양한 형상으로 될 수 있다.In this embodiment, the housing body 12 in the housing 10 has a cylindrical shape, but this is not necessarily the case. The housing body 12 may be in various shapes such as a hexahedral shape.
상기 하우징본체(12)의 내부공간(13) 내면에는 댐퍼(20)가 장착된다. 상기 댐퍼(20)는 예를 들면, 고무나 에폭시 등 어느 정도 탄성이 있는 재질로 만들어진다. 상기 댐퍼(20)는 아래에서 설명될 질량체(22)가 진동할 수 있도록 하면서 상기 하우징본체(12)를 통해 전달되는 진동의 일부를 흡수하게 된다. 참고로 상기 댐퍼(20)는 스프링과 같은 탄성부재로 만들어질 수도 있다. 본 실시례에서는 상기 댐퍼(20)가 상기 하우징본체(12)의 내부공간(13)에 아래에서 설명될 탱크(30)의 외면과 마주보는 면에 결합되어 있으나, 반드시 그러해야 하는 것은 아니다. 예를 들면 상기 하우징본체(12)의 내면중 곡면인 내측면에 댐퍼(20)에 설치될 수도 있다. 상기 댐퍼(20)는 진동발생원에서 발생하는 진동의 주파수와 같은 고유진동수를 가질 수 있다.A damper 20 is mounted on the inner surface 13 of the housing body 12. The damper 20 is made of a material having a certain elasticity, for example, rubber or epoxy. The damper 20 absorbs a part of the vibration transmitted through the housing body 12 while allowing the mass body 22 to be described below to vibrate. For reference, the damper 20 may be made of an elastic member such as a spring. In this embodiment, the damper 20 is coupled to the inner space 13 of the housing body 12 facing the outer surface of the tank 30 to be described below, but this is not necessary. For example, a damper 20 may be installed on an inner surface that is a curved surface among the inner surfaces of the housing body 12. The damper 20 may have a natural frequency equal to the frequency of vibration generated in the vibration generating source.
상기 댐퍼(20)에는 질량체(22)가 장착된다. 상기 질량체(22)는 소정 형상의 금속판이 사용된다. 상기 질량체(22)의 재질로는 스틸(steel)을 예로 들 수 있다. 상기 질량체(22)는 진동발생원에서 발생하는 진동의 주파수와 같은 고유진동수를 가진다.A mass body 22 is mounted on the damper 20. The mass 22 is a metal plate of a predetermined shape. As the material of the mass body 22, steel may be exemplified. The mass body 22 has a natural frequency equal to the frequency of the vibration generated in the vibration generating source.
상기 질량체(22)는 상기 내부공간(13)에 설치된 상태에서 일측 표면이 진동발생원인 변압기의 외관을 구성하는 탱크(10)의 외면과 마주보게 된다. 상기 질량체(22)에서 상기 탱크(10)의 외면과 마주보는 부분은 가장 면적이 넓은 표면이다. 이와 같이 진동발생원의 탱크(30) 외면과 질량체(22)의 표면이 마주보면서 탱크(30)의 표면으로 나오는 진동과 질량체(22)의 표면으로 나오는 진동이 서로 상쇄되어 소음원이 제거되는 것이다. 이를 위해 상기 질량체(22)의 고유진동수는 진동발생원인 변압기에서 발생하는 진동의 주파수와 같고, 상기 탱크(30)에서 나오는 진동과 역상이 되는 진동을 발생시킬 수 있도록 만들어져야 한다.The mass body 22 faces the outer surface of the tank 10 constituting the exterior of the transformer, which is a source of vibration in one state in the state installed in the inner space 13. The portion facing the outer surface of the tank 10 in the mass 22 is the largest surface area. As described above, while the outer surface of the tank 30 of the vibration generating source and the surface of the mass body 22 face each other, the vibrations coming out of the surface of the tank 30 and the vibrations coming out of the surface of the mass body 22 cancel each other out and the noise source is removed. To this end, the natural frequency of the mass 22 is the same as the frequency of the vibration generated in the transformer, which is the source of vibration, and must be made to generate vibration that is inversely related to the vibration from the tank 30.
한편, 상기 하우징(10)이 장착되는 진동발생원, 예를 들면 변압기의 외관을 구성하는 탱크(30)에 형성된 구성을 설명한다. 상기 탱크(30)에 하우징(10)을 장착하기 위해서는 탱크(30)의 외면에 체결구(32)가 다수개 고정되어 설치된다. 상기 체결구(32)의 예로는 스터드볼트가 있다. 상기 체결구(32)는 상기 탱크(30)의 외면에 용접 등의 방법을 통해 설치될 수 있다. 상기 체결구(32)에는 상기 체결구(32)가 상기 하우징(10)의 장착플랜지(14)를 관통한 상태에서 너트(34)가 체결되어 상기 하우징(10)의 장착플랜지(14)를 탱크(30)에 장착할 수 있다. 도면부호 36은 평와셔, 38은 스프링와셔로서 상기 너트(34)와 장착플랜지(14) 사이에 설치되어 상기 너트(34)가 진동 등에 의해 상기 체결구(32)에서 풀리는 것을 차단한다.On the other hand, a description will be given of the structure formed in the vibration generating source to which the housing 10 is mounted, for example, the tank 30 constituting the exterior of the transformer. In order to mount the housing 10 on the tank 30, a plurality of fasteners 32 are fixed and installed on the outer surface of the tank 30. An example of the fastener 32 is a stud bolt. The fastener 32 may be installed on the outer surface of the tank 30 through a method such as welding. In the fastener 32, a nut 34 is fastened while the fastener 32 penetrates the mounting flange 14 of the housing 10 to tank the mounting flange 14 of the housing 10. Can be mounted on 30. Reference numeral 36 is a flat washer, 38 is a spring washer is installed between the nut 34 and the mounting flange 14 to block the nut 34 from being loosened in the fastener 32 by vibration or the like.
한편, 도면으로 도시하지는 않았지만, 상기 하우징(10)에서 하우징본체(12)중 상기 댐퍼(20)가 부착되는 부분만을 금속으로 하고 나머지는 고무, 에폭시 또는 탄성부재로 만들 수도 있다. 물론, 상기 장착플랜지(14)는 금속으로 만드는 것이다. 이와 같이 하게 되면 상기 하우징본체(12)가 동흡진 역할을 수행할 수 있게 된다. 따라서, 동흡진장치가 직렬로 연결된 형태가 된다. On the other hand, although not shown in the drawing, only the portion to which the damper 20 is attached to the housing body 12 in the housing 10 may be made of metal, and the rest may be made of rubber, epoxy, or elastic members. Of course, the mounting flange 14 is made of metal. In this way, the housing body 12 can perform the role of copper exhaustion. Therefore, the dynamic absorption device is connected in series.
이하 상기한 바와 같은 구성을 가지는 본 발명에 의한 밀폐형 동흡진장치가 사용되는 것을 상세하게 설명한다.Hereinafter, it will be described in detail that the closed type copper suction device according to the present invention having the configuration as described above is used.
본 발명의 장치는 진동발생원의 외관인 탱크(30)에 장착되어 사용된다. 상기 탱크(30)에 고정된 다수개의 체결구(32)가 상기 하우징(10)의 장착플랜지(14)에 형성된 체결공(16)을 관통하게 되고, 상기 너트(34)를 상기 체결구(32)에 와셔(36,38)를 게재한 상태로 체결한다. 이와 같이 상기 너트(34)를 체결구(32)에 체결하게 되면 상기 장착플랜지(14)가 상기 탱크(30)의 외면에 밀착되게 한다.The apparatus of the present invention is used to be mounted on the tank 30 which is the appearance of the vibration generating source. A plurality of fasteners 32 fixed to the tank 30 penetrate through fasteners 16 formed in the mounting flange 14 of the housing 10, and the nuts 34 are fastened to the fasteners 32 ) With the washers 36 and 38 posted. Thus, when the nut 34 is fastened to the fastener 32, the mounting flange 14 is brought into close contact with the outer surface of the tank 30.
상기 탱크(30)에 본 발명의 장치가 장착된 상태에서 변압기가 동작되면 진동이 발생하고 이 진동은 상기 탱크(30)를 통해 외부로 전달된다. 이와 같이 탱크(30)로 전달된 진동은 본 발명의 장치에 의해서 흡수되거나 상쇄된다.When the transformer is operated while the apparatus of the present invention is mounted on the tank 30, vibration occurs and the vibration is transmitted to the outside through the tank 30. The vibration transmitted to the tank 30 in this way is absorbed or canceled by the device of the present invention.
상기 하우징(10)이 상기 탱크(30)에 장착되면, 상기 장착플랜지(14)가 상기 탱크(30)에 밀착되어 상기 탱크(30)의 외부로 전달되는 진동이 상기 장착플랜지(14)를 거쳐서 상기 하우징본체(12)로 전달된다. When the housing 10 is mounted on the tank 30, the mounting flange 14 is in close contact with the tank 30 and vibration transmitted to the outside of the tank 30 passes through the mounting flange 14 It is transferred to the housing body 12.
한편, 상기 하우징본체(10)로 전달된 진동에 의해 상기 하우징본체(10)가 진동되면서 상기 댐퍼(20)와 상기 댐퍼(20)에 장착되어 상기 탱크(30)의 외면과 마주보는 질량체(22)도 진동하게 된다. 상기 질량체(22)의 고유진동수는 상기 탱크(30)에서 발생하는 진동의 주파수와 같고 상이 서로 반대로 되어 있다. 따라서, 상기 질량체(22)에서 나오는 진동과 상기 탱크(30)에서 나오는 진동은 서로 상쇄되어 제거된다.On the other hand, while the housing body 10 is vibrated by the vibration transmitted to the housing body 10, the damper 20 and the damper 20 are mounted on the mass body 22 facing the outer surface of the tank 30 ) Also vibrates. The natural frequency of the mass 22 is the same as the frequency of vibration generated in the tank 30 and the phases are reversed. Accordingly, vibrations from the mass body 22 and vibrations from the tank 30 are canceled out and canceled.
이와 같이 상기 탱크(30)에서 나와서 상기 하우징(10)으로 전달된 진동은 상기 댐퍼(20)와 질량체(22)로 전달되면서 하우징(10) 외부로 나가는 진동과 소음을 줄여주고, 상기 질량체(22)에서 나오는 진동과 상기 탱크(30)에서 나오는 진동이 서로 상쇄되어 없어지면서 또한 소음이 발생하지 않게 되어 전체적으로 소음 발생이 현저하게 줄어들게 된다.As described above, vibrations transmitted from the tank 30 to the housing 10 are transmitted to the damper 20 and the mass body 22 while reducing vibrations and noise going out of the housing 10 and the mass body 22. ) And the vibrations from the tank 30 cancel each other out and disappear, and no noise is generated, thereby significantly reducing the overall noise generation.
그리고, 본 발명에서는 금속으로 된 상기 하우징(10)의 내부공간(13)에 상기 댐퍼(20)와 질량체(22)가 설치된다. 상기 하우징(10)이 탱크(30)에 장착되면 상기 내부공간(13)은 외부와 차폐되므로 외부의 환경이 상기 댐퍼(20)나 질량체(22)에 전달되지 않으므로, 댐퍼(20)나 질량체(22)의 환경에 의한 손상이 거의 발생하지 않게 된다.And, in the present invention, the damper 20 and the mass body 22 are installed in the inner space 13 of the housing 10 made of metal. When the housing 10 is mounted on the tank 30, since the inner space 13 is shielded from the outside, the external environment is not transmitted to the damper 20 or the mass body 22, so the damper 20 or the mass body ( The damage caused by the environment of 22) hardly occurs.
한편, 도 6에는 본 발명 실시례에서 탱크(30)의 내부에서 발생하는 진동의 주파수가 120Hz일때, 본 발명 장치를 사용하였을 때, 탱크(30), 하우징(10), 질량체(22)에서의 진동의 크기를 보여주고 있다. 그래프에서 가로축은 진동수이고 세로축은 진동의 세기를 나타낸다.On the other hand, in Figure 6 in the embodiment of the present invention when the frequency of the vibration generated in the interior of the tank 30 is 120Hz, when using the device of the present invention, the tank 30, the housing 10, the mass 22 It shows the magnitude of vibration. In the graph, the horizontal axis represents the frequency and the vertical axis represents the intensity of the vibration.
여기에서 알 수 있듯이, 탱크(30)에서는 진동수가 120Hz 일때 진동의 세기가 가장 줄어든 것을 알 수 있고, 하우징(10)에서도 120Hz에서 진동의 세기가 가장 줄어들어 있음을 알 수 있다.As can be seen here, it can be seen that the intensity of vibration is reduced most when the frequency is 120 Hz in the tank 30, and the intensity of vibration is also reduced at 120 Hz in the housing 10.
그리고, 질량체(22)에서는 100Hz와 150Hz에서는 진동의 세기가 커지나 그 사이에서는 상대적으로 낮게 되어 있다. 이는 상기 질량체(22)는 하우징(10)을 통해 전달된 진동에 의해 진동되면서 탱크(30)에서 나오는 진동과의 상쇄작용을 하므로 진동의 세기는 일정 이상의 값을 유지하고 있는 것이다.In addition, in the mass body 22, at 100 Hz and 150 Hz, the intensity of vibration increases, but in the meantime, it is relatively low. This is because the mass 22 is vibrated by the vibration transmitted through the housing 10 and counteracts the vibration from the tank 30, so that the intensity of vibration is maintained at a value above a certain level.
이상에서, 본 발명의 실시례를 구성하는 모든 구성 요소들이 하나로 결합하거나 결합하여 동작하는 것으로 설명되었다고 해서, 본 발명이 반드시 이러한 실시례에 한정되는 것은 아니다. 즉, 본 발명의 목적 범위 안에서라면, 그 모든 구성 요소들이 하나 이상으로 선택적으로 결합하여 동작할 수도 있다. 또한, 이상에서 기재된 "포함하다", "구성하다" 또는 "가지다" 등의 용어는, 특별히 반대되는 기재가 없는 한, 해당 구성 요소가 내재할 수 있음을 의미하는 것이므로, 다른 구성 요소를 제외하는 것이 아니라 다른 구성 요소를 더 포함할 수 있는 것으로 해석되어야 한다. 기술적이거나 과학적인 용어를 포함한 모든 용어들은, 다르게 정의되지 않는 한, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자에 의해 일반적으로 이해되는 것과 동일한 의미가 있다. 사전에 정의된 용어와 같이 일반적으로 사용되는 용어들은 관련 기술의 문맥상의 의미와 일치하는 것으로 해석되어야 하며, 본 발명에서 명백하게 정의하지 않는 한, 이상적이거나 과도하게 형식적인 의미로 해석되지 않는다.In the above, even if all the components constituting the embodiments of the present invention are described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, if it is within the scope of the present invention, all of the components may be selectively combined and operated. In addition, the terms "include", "consist" or "have" as described above mean that the corresponding component can be intrinsic, unless specifically stated otherwise, to exclude other components. It should not be interpreted as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as generally understood by a person skilled in the art to which the present invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted as being consistent with the contextual meaning of the related art, and are not to be interpreted as ideal or excessively formal meanings unless explicitly defined in the present invention.
이상의 설명은 본 발명의 기술 사상을 예시적으로 설명한 것에 불과한 것으로서, 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자라면 본 발명의 본질적인 특성에서 벗어나지 않는 범위에서 다양한 수정 및 변형이 가능할 것이다. 따라서, 본 발명에 개시된 실시례들은 본 발명의 기술 사상을 한정하기 위한 것이 아니라 설명하기 위한 것이고, 이러한 실시례에 의하여 본 발명의 기술 사상의 범위가 한정되는 것은 아니다. 본 발명의 보호 범위는 아래의 청구범위에 의하여 해석되어야 하며, 그와 동등한 범위 내에 있는 모든 기술 사상은 본 발명의 권리범위에 포함되는 것으로 해석되어야 할 것이다.The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the equivalent range should be interpreted as being included in the scope of the present invention.

Claims (7)

  1. 내부에 내부공간이 형성되는 하우징본체와 상기 하우징본체의 내부공간 입구 가장자리를 둘러 형성되어 진동발생원에 장착되는 장착플랜지를 구비하는 하우징과,A housing body having an inner space formed therein and a mounting flange formed around an entrance edge of the inner space of the housing body and mounted on a vibration generating source;
    상기 하우징의 내부공간 내면에 설치되는 댐퍼와,A damper installed on the inner surface of the inner space of the housing,
    상기 댐퍼에 구비되고 상기 진동발생원에서 발생하는 진동의 주파수와 고유진동수가 동일하고 상기 진동발생원에서 나오는 진동과 역상의 진동을 발생시키는 질량체를 포함하는 밀폐형 동흡진장치.The damper is provided in the damper, the vibration frequency generated from the vibration source and the natural frequency is the same, and includes a mass body that generates vibration and reverse vibration from the vibration source.
  2. 제 1 항에 있어서, 상기 하우징은 금속재질로 만들어지는 것으로 상기 진동발생원에서 발생하는 진동을 상기 댐퍼로 전달하는 밀폐형 동흡진장치.According to claim 1, wherein the housing is made of a metal material, a closed type copper suction device that transmits vibration generated from the vibration generating source to the damper.
  3. 제 2 항에 있어서, 상기 장착플랜지가 상기 진동발생원에 장착됨에 의해 상기 댐퍼와 질량체가 구비되는 상기 내부공간은 외부와 차폐되는 밀페형 동흡진장치.The sealed copper dust absorbing device according to claim 2, wherein the inner space in which the damper and the mass body are provided is shielded from the outside by mounting the mounting flange to the vibration generating source.
  4. 제 3 항에 있어서, 상기 장착플랜지에는 체결공이 다수개 형성되어 상기 진동발생원의 외면에 설치된 체결구가 관통하는 밀폐형 동흡진장치. According to claim 3, A plurality of fastening holes are formed in the mounting flange, the sealed copper suction device through which the fastener installed on the outer surface of the vibration generating source penetrates.
  5. 제 4 항에 있어서, 상기 댐퍼는 고무나 에폭시로 만들어지거나 스프링이 사용되는 밀폐형 동흡진장치.The hermetic copper absorber according to claim 4, wherein the damper is made of rubber or epoxy or a spring is used.
  6. 제 1 항 내지 제 5 항중 어느 한 항에 있어서, 상기 질량체는 금속재질로 만들어지고 가장 넓은 표면이 상기 진동발생원과 마주보게 상기 댐퍼에 설치되는 밀페형 동흡진장치.According to any one of claims 1 to 5, The mass body is made of a metal material and the widest surface is a sealed copper damping device installed in the damper facing the vibration generating source.
  7. 제 6 항에 있어서, 상기 질량체는 판형상으로 되는 밀폐형 동흡진장치.7. The hermetic copper suction device according to claim 6, wherein the mass body is plate-shaped.
PCT/KR2019/015819 2018-12-06 2019-11-19 Sealed dynamic vibration absorption device WO2020116824A1 (en)

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