KR20170079584A

KR20170079584A - Dynamic vibration absorber for pipe

Info

Publication number: KR20170079584A
Application number: KR1020150190323A
Authority: KR
Inventors: 이규호; 박철준; 김도진
Original assignee: 주식회사 효성
Priority date: 2015-12-30
Filing date: 2015-12-30
Publication date: 2017-07-10
Also published as: KR101794946B1

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic suction device for piping. The present invention relates to an elastic block 10 of an elastic material having a symmetrical shape about the longitudinal direction of the pipe P and surrounding a part of the outer surface of the pipe P, And a mass block 30 having a symmetrical shape about the longitudinal direction of the pipe P, which is connected to the pipe P by pressing the elastic body in the pipe P direction. When the elastic block 10 transmits the vibration of the pipe P to the mass block 30, the frequency of the mass block 30 is synchronized with the natural frequency of the pipe P and is absorbed. The vibration damping device for piping according to the present invention uses an elastic block 10 made of rubber as an elastic body, and the elastic block 10 has a structure having no directionality, so that vibration control can be performed in all three directions.

Description

[0001] The present invention relates to a dynamic vibration absorber for pipe,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a dynamic damper, and more particularly, to a damper capable of vibration control in three directions generated in a pipeline.

In general, equipment such as a power plant, a substation, and a plant is connected to a piping system by most of the mechanical elements due to the characteristics of equipment that moves various fluids and generates and transports high temperature and high pressure steam to generate and utilize energy. In addition to these large-scale production facilities, water-moving pumps and piping systems are installed all over the building, starting from underground, in general large buildings and industrial / residential sites. In other words, piping system is the main part to connect equipment / equipments like the blood vessels of the human body in industrial and residential areas and to maintain optimization of facilities operation.

In the piping system by the harmonic vibration of the mechanical structure together with the water hamming, cavitation and pressure pulsation in the piping caused by the change of the pipe structure, temperature and pressure condition, Vibration, etc., can cause excessive vibration in the piping system, so it is very important to attenuate it.

For example, vibration of a piping system may be caused by a sudden change in temperature or pressure due to external influences of the fluid in the piping, or when a high temperature or high pressure steam moves inside the piping, , And also occurs when the fluid flow characteristics have pipe natural frequencies. If the vibration generated is large, an abnormality occurs in the piping system, and if it is severe, it may cause damage. Particularly, fatigue failure of joints of piping, leakage and leakage of sewage may occur.

To solve this problem, dynamic vibration absorbers have been developed and applied to piping. However, since the dynamic damper is effective only for unidirectional vibration, it is difficult to solve the problem of piping vibration that occurs in many directions, and there is also a limitation in that it is difficult to reduce high frequency vibration caused by ductility of valves and pumps in a large piping structure.

Also, the conventional dynamic damper is structurally complicated, and the spring provided therein may be deformed due to cyclic loading, which results in poor durability.

Korean Registration Practice No. 20-0470896

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art as described above, and it is an object of the present invention to reduce the vibration of piping that can be generated in multiple directions by using one dynamic ashing device.

Another object of the present invention is to provide a dynamic asynchronous device composed of an elastic body and a mass body from which a spring susceptible to characteristic deformation due to cyclic loading is excluded.

In order to achieve the above object, according to an aspect of the present invention, there is provided an elastic block comprising: an elastic block of an elastic material having a symmetrical shape around a longitudinal direction of a pipe, And a mass block having a symmetrical shape about the longitudinal direction of the pipe. The elastic block transmits the vibration of the pipe to the mass block, Is sucked and synchronized with the natural frequency of the pipe.

The natural frequency of the combination of the elastic block and the mass block is set equal to the number of vibrations of the pipe.

The elastic block is made of rubber or synthetic rubber but is made uniform in its entirety.

The elastic block is composed of a pair of elastic bodies for coupling the pipe with each other, and the mass block is composed of a pair of mass bodies for coupling the elastic block therebetween, and one end is hinged.

One end of the pair of mass blocks is hinged to be coupled to each other, and the other end is composed of a coupling portion that is selectively coupled by a fastener.

A coupling finger protrudes from the coupling portion of the mass body, the coupling finger is staggered with the coupling finger of the mass body, and the coupling finger has a finger hole through which the coupling pin passes.

The diameter of the pipe hole formed at the center of the elastic block is smaller than the outer diameter of the pipe and the diameter of the coupling hole formed at the center of the mass block is smaller than the outer diameter of the elastic block.

The piping suction device according to the present invention as described above has the following effects.

The vibration damping device for piping according to the present invention uses an elastic block made of rubber as an elastic body, and the elastic block has a structure having no directionality, so that vibration control can be performed in all three directions, not in a unidirectional direction. Therefore, since vibration control of the pipe can be effectively performed by using one dynamic ashing device, the number of parts for vibration control can be reduced and the installation cost can be reduced.

Particularly, in the present invention, by using an elastic block made of a rubber material rather than a spring as an elastic body, even if the vibration of the pipe is performed in a higher frequency band, it can be applied and the durability can be improved due to less plastic deformation In addition, since the rigidity of the elastic block itself can be utilized as well as the mass block in controlling the frequency, various applications are possible.

In the present invention, since the elastic block can be pressed in the piping direction by using the hinge structure of the mass block, it can be easily installed / dismantled without a separate tool or fastening device, The water retention is improved.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing an embodiment of a dynamic asynchronous device for piping according to the present invention applied to a piping; Fig.
Fig. 2 is an exploded perspective view showing a configuration of an embodiment of the piping damper according to the present invention. Fig.
3 is a sectional view taken along the line I-I 'in Fig. 1;
4 is a cross-sectional view taken along line II-II 'of FIG. 1;
Fig. 5 and Fig. 6 are perspective views showing the construction of different embodiments of the piping damper according to the present invention. Fig.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the understanding why the present invention is not intended to be interpreted.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

The piping damper according to the present invention is for controlling vibrations generated in a piping system, that is, a piping (P) through which fluid flows into the piping and a pipe-like structure. For example, when a voltage of a certain frequency is applied to a structure connected to a pipe P, it causes resonance of the pipe P to generate vibration and noise, which is reduced or eliminated by using the same.

The dynamic vibration damping device of the present invention mainly comprises an elastic block (10) and a mass block (30). The elastic block 10 is coupled to the outer circumferential surface of the pipe P and the mass block 30 functions to enclose and fix the outer surface of the elastic block 10. Hereinafter, The structure will be described.

The elastic block 10 surrounds a part of the outer surface of the pipe P which is a vibration. As shown in FIG. 1, the elastic block 10 is formed in a substantially ring or cylindrical shape, and has a structure in which the pipe P passes through the center thereof. Accordingly, the elastic block 10 is formed symmetrically in all directions about the longitudinal direction of the pipe P.

The elastic block 10 may be made of an elastic material, for example, rubber, synthetic rubber, silicone rubber or the like, and the material itself is an elastic material. That is, the elastic block 10 is not elastic in a specific direction, but has an elastic force in a non-directional direction. Accordingly, even if an external force acts on all the x, y, and z axes in FIG. 1, the elastic block 10 has an elastic force against it and can be elastically restored. Preferably, the elastic block 10 is entirely uniformly made to have no directionality.

As shown in FIG. 2, the elastic blocks 10 may be formed as a pair symmetrical to each other. The elastic block 10 has a pair of elastic bodies 11 and 13 for coupling the pipe P therebetween. When the elastic bodies 11 and 13 are coupled, a pipe hole 11 ' , 13 'are formed. The pipe P passes through the pipe holes 11 'and 13'. The elastic block 10 is made of the same rubber material and the elastic block 10 has two elastic bodies 11 and 13 so that the elastic block 10 can be more easily assembled to the pipe P. [

The outer peripheral surface of the elastic block 10 is surrounded by the mass block 30. The mass block 30 is fixed to the pipe P by being compressed after the elastic block 10 is compressed to the pipe P. [ The mass block 30 is formed in a ring or cylindrical shape in the same manner as the elastic block 10.

The mass block 30 is a mass body that vibrates when the vibrations of the pipe P are transmitted to the mass block 30 so that the vibrations of the mass block 30 are synchronized with the natural frequency of the pipe P, (Damping) function. For this, the mass block 30 is formed to have a mass greater than a predetermined mass, and may be made of a material having a high density, for example, a metal material.

Like the elastic block 10, the mass block 30 has a symmetrical shape about the longitudinal direction of the pipe P. [ The mass block 30 is composed of a pair of mass bodies 31 and 33 for coupling the elastic block 10 therebetween. As shown in FIG. 2, the mass block 30 is composed of a pair of mass bodies 31 and 33, each of which has a substantially semicircular outer shape, and one end of which is joined by a hinge. The hinge may comprise a hinge pin 50 passing through a hole formed at one end of the mass body 31, 33.

In this embodiment, one end of the pair of mass blocks 30 is hinged by the hinge pin 50, and the other end is composed of a coupling portion selectively coupled by a coupling pin 50 ' do. The coupling portion is for pressing the elastic block 10 in the direction of the pipe P so that the mass block 30 is fixed or released.

The coupling portion of the mass block 30 includes a plurality of coupling fingers 32, 35 protruding toward the counter mass body 31, 33. A plurality of the coupling fingers 32 and 35 are protruded at different heights from each other. The pair of mass bodies 31 and 33 are provided with coupling fingers 32 and 35 at mutually complementary positions, have. The fastening pins 50 'are passed through the finger holes (not shown) formed in the coupling fingers 32 and 35 so that they can be held in a coupled state.

In the present invention, the dynamic aspiration apparatus having such a structure can perform a damping function in all three directions. To this end, the damping apparatus is formed to have a left-right symmetrical shape with respect to the x, y, and z axes. Referring to FIG. 3, the elastic block 10 and the mass block 30 are symmetrical with respect to the y-axis, respectively, and have a symmetrical structure with respect to the z-axis. On the other hand, referring to FIG. 4, it can be seen that the elastic block 10 and the mass block 30 have symmetrical shapes with respect to the x axis.

Preferably, the natural frequency of the combination of the elastic block 10 and the mass block 30 is set equal to the number of vibrations of the pipe P. [ This is to make the natural frequency of the dynamic aspirator according to the present invention equal to the frequency of vibration of the pipeline P, which is a vibration, so as to eliminate or at least largely reduce vibration.

The natural frequency of the combination of the elastic block 10 and the mass block 30 can be designed differently depending on the characteristics of the pipe P. For example, various variables such as the shape, material, (For example, 60 Hz or 120 Hz) of the element which can directly or indirectly be connected to the pipe P to apply vibration thereto. In consideration of this characteristic, the natural frequencies of the mass block 30 and the elastic block 10 can be determined. The natural frequency varies depending on the stiffness (k) and mass (m) as shown below.

Here, the mass m may be the sum of the elastic block 10 and the mass block 30, or may be a mass of the mass block 30 only.

The mass and stiffness may be changed by changing the material of the elastic block 10 or the mass block 30, but it is also possible to increase the total height or decrease the total diameter as shown in FIG. 5 or 6 Or the like.

The diameters of the pipe holes 11 'and 13' formed at the center of the elastic block 10 are smaller than the diameters of the pipe P and the diameter of the coupling hole formed at the center of the mass block 30 is smaller than the elasticity Is smaller than the outer diameter of the block (10). The outer circumferential surface of the elastic block 10 is also in contact with the outer circumferential surfaces of the mass bodies 31 and 33. The outer circumferential surfaces of the elastic bodies 10 and 11 ' And are tightly adhered to each other to some extent. Accordingly, the elastic block 10 not only transmits the vibration of the pipe P to the mass block 30 more effectively, but also increases the rigidity of the elastic block 10 itself.

Hereinafter, a process of using the piping suction device according to the present invention will be described.

First, a pair of elastic bodies 11 and 13 constituting the elastic block 10 are tightly adhered to each other while surrounding the outer surface of the pipe P, and are joined in a ring shape. In this state, the mass bodies 31 and 33 surround the outer circumferential surfaces of the elastic bodies 11 and 13, and the mass bodies 31 and 33 are separated from each other around the hinge pin 50, The elastic bodies 11 and 13 are wrapped in a state in which they are opened.

Of course, the pair of elastic bodies 11 and 13 may be coupled to the inner surfaces of the mass bodies 31 and 33, respectively. That is, the elastic bodies 11 and 13 may be coupled to the pipe P while being coupled to the mass bodies 31 and 33 using an adhesive or the like.

In this case, the diameter of the pipe hole 11 ', 13' of the elastic block 10 is smaller than the outer diameter of the pipe P, and the diameter of the coupling hole of the mass block 30 is smaller than the outer diameter of the elastic block 10 The elastic block 10 is strongly pressed between the pipe P and the mass block 30 which are relatively rigid bodies. Therefore, the rigidity of the elastic block 10 itself becomes high.

Finally, when the fastening pins 50 'pass through the finger holes of the coupling fingers 32 and 35 which are respectively provided in the pair of mass bodies 31 and 33 and are staggered with each other, Can be maintained.

Since the elastic block 10 can be pressed in the direction of the pipe P by using the hinge structure of the mass block 30 as described above, the present invention can be easily installed without any additional tool or fastening device, . Further, both the elastic block 10 and the mass block 30 can be assembled to the pipe P without being oriented.

When the mass block 30 and the elastic block 10 are coupled to the pipe P, the vibration generated during use of the pipe P is absorbed to reduce the vibration and thus the noise. That is, when an external force continuously transmitted from the outside, such as a current of a specific frequency, is applied, the pipe P may resonate by matching the external frequency with the natural frequency of the pipe P. However, The dynamic ashing device of the present invention prevents this.

Specifically, the natural frequency of the pipe P is increased by the mass of the mass block 30, and a frequency band in which the amplitude is zero between the two natural frequency regions is generated, whereby the vibration is prevented. That is, if the natural frequency by the mass block 30 is equal to the frequency generated by external application, all the vibrations can be absorbed. As a result, it is possible to make the natural frequency of the dynamic aspirator equal to the oscillation frequency of the pipeline P, which is a vibrating chain, thereby eliminating or at least largely reducing vibration. For this, the natural frequency of the combined body of the elastic block 10 and the mass block 30 is preferably set equal to the number of vibrations of the pipe P. [

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

In the above-described embodiment, both the mass block 30 and the elastic block 10 have a substantially ring-shaped structure, but are not limited thereto. For example, both the mass block 30 and the elastic block 10 may be formed in a spherical shape and coupled to the pipe P.

10: elastic block 11, 13: elastic body
30: mass block 31, 33: elastic body
32, 35: coupling finger 50: hinge pin
50 ': fastening pin

Claims

An elastic block of an elastic material having a symmetrical shape around the longitudinal direction of the pipe,
And a mass block having a symmetrical shape about the longitudinal direction of the pipe, the mass block being connected to the pipe by pressing the elastic body in the pipe direction by wrapping the outer surface of the elastic block,
Wherein when the elastic block transmits the vibration of the pipe to the mass block, the frequency of the mass block is synchronized with the natural frequency of the pipe to be sucked.

The dynamic asynchronous condenser according to claim 1, wherein a natural frequency of a combination of the elastic block and the mass block is set equal to an oscillatory frequency of the pipe.

The dynamic asynchronous condenser according to claim 1 or 2, wherein the elastic block is made of rubber or synthetic rubber, and the whole is made uniform.

[5] The apparatus as claimed in claim 3, wherein the elastic block is composed of a pair of elastic bodies for coupling the pipe through the pipe, and the mass block is composed of a pair of mass bodies for coupling the elastic block therebetween, And a hinge coupled to the pipe.

The dynamic asynchronous condenser according to claim 4, wherein the pair of mass blocks are hinged to each other, and the other end is a coupling portion selectively coupled by a fastener.

[5] The apparatus of claim 4, wherein the coupling body of the mass body is provided with a coupling finger protruding, the coupling finger is staggered with the coupling finger of the mass body, and the coupling finger has a finger hole through which the coupling pin passes Dynamic suction device for piping.

The dynamic asynchronous compressor according to claim 1, wherein a diameter of a pipe hole formed at a center of the elastic block is smaller than an outer diameter of the pipe, and a diameter of a coupling hole formed at a center of the mass block is smaller than an outer diameter of the elastic block.