CN119513457B - Vibration-damping clamp for pipeline - Google Patents
Vibration-damping clamp for pipeline Download PDFInfo
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- CN119513457B CN119513457B CN202510093337.XA CN202510093337A CN119513457B CN 119513457 B CN119513457 B CN 119513457B CN 202510093337 A CN202510093337 A CN 202510093337A CN 119513457 B CN119513457 B CN 119513457B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
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- 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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/033—Noise absorbers
- F16L55/035—Noise absorbers in the form of specially adapted hangers or supports
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Abstract
一种管路减振卡箍，包括：卡箍单元，卡箍单元可形成环抱于管路上的管路减振卡箍，卡箍单元包括有卡箍本体，于卡箍本体上设置有沟槽结构，于沟槽结构内设置有多个金属橡胶块，金属橡胶块的成型方向与金属橡胶块工装后的受力方向一致，金属橡胶块的成型方向为垂直于金属橡胶块的上、下底面的方向。在本发明中，金属橡胶块的密度和预紧量的参数配合设计，可以在相同压强的工况下，使得金属橡胶块获得最小的刚度，从而提高金属橡胶块的减振效果；金属橡胶块与管路之间的接触面完全紧贴，其下底面尽可能地与卡箍内部沟槽接触，金属橡胶件受力更加均匀，金属橡胶块的成型方式可以同时增大金属橡胶块的承载能力和阻尼减振效果。
A pipeline vibration damping clamp comprises: a clamp unit, the clamp unit can form a pipeline vibration damping clamp that embraces the pipeline, the clamp unit comprises a clamp body, a groove structure is arranged on the clamp body, a plurality of metal rubber blocks are arranged in the groove structure, the molding direction of the metal rubber block is consistent with the force direction of the metal rubber block after tooling, and the molding direction of the metal rubber block is perpendicular to the upper and lower bottom surfaces of the metal rubber block. In the present invention, the density and preload parameters of the metal rubber block are designed in a coordinated manner, so that the metal rubber block can obtain the minimum stiffness under the same pressure condition, thereby improving the vibration damping effect of the metal rubber block; the contact surface between the metal rubber block and the pipeline is completely close, and its lower bottom surface is in contact with the internal groove of the clamp as much as possible, so that the metal rubber part is subjected to more uniform force, and the molding method of the metal rubber block can simultaneously increase the bearing capacity and damping vibration reduction effect of the metal rubber block.
Description
Technical Field
The invention relates to the technical field of pipeline vibration reduction related equipment, in particular to a pipeline vibration reduction clamp.
Background
The pipeline system is an indispensable liquid or gas circulation system on equipment such as ships, nuclear power and the like, and during the service period, the pipeline system is inevitably subjected to strong vibration of pipelines caused by external impact, so that the stability of material transportation and precise instrument equipment in the pipeline system can be influenced, the pipeline system is invalid when the pipeline system is light, the hull explosion is caused when the pipeline system is heavy, more serious accidents are caused, and even the ship is destroyed. Although the pipeline system plays a role in the ships, the transmission of water, oil, gas and the like in the ships is performed normally through the pipeline system, the pipeline system is extremely easy to be affected by impact vibration, so that the vibration problem of the pipeline system in the ships is highly emphasized.
Currently, the vibration damping effect and the fatigue life of the vibration damper are the most focused on the pipeline vibration damper used for various ships. In the prior art, in the pipe clamp for commonly assembling the metal rubber block, as the stress direction of the metal rubber block is a non-forming direction, or the contact area between the metal rubber block and the pipeline or the pipe clamp groove is smaller, the bearing capacity of the metal rubber is lower, and the service life of the metal rubber is reduced. For some conditions with higher load demands, the density or pre-load of the metal rubber is usually designed to be larger, but the damping effect of the metal rubber is reduced.
Disclosure of Invention
(One) technical problem.
Therefore, how to improve the bearing capacity and obtain better vibration reduction effect is an important problem to be solved in designing metal rubber.
And (II) technical scheme.
In order to achieve the above object, the present invention provides the following technical solutions:
The invention provides a pipeline vibration damping clamp, which comprises:
At least two clamp units, all of which can form a pipeline vibration-damping clamp encircling the pipeline;
the clamp unit comprises a clamp body, a groove structure is arranged on the clamp body, a plurality of metal rubber blocks are arranged in the groove structure, the upper bottom surfaces of the metal rubber blocks are propped against the surface of a pipeline, and the lower bottom surfaces of the metal rubber blocks are propped against the inner bottom surface of the groove structure;
the forming direction of the metal rubber block is consistent with the stress direction of the metal rubber block after the tool, and the forming direction of the metal rubber block is perpendicular to the upper bottom surface and the lower bottom surface of the metal rubber block.
Preferably, in the pipe vibration damping clip provided by the present invention:
The metal rubber block comprises a trapezoid structure part and a rectangular structure part, wherein the trapezoid structure part is provided with the upper bottom surface, and the rectangular structure part is provided with the lower bottom surface;
The metal rubber blocks are sequentially arranged in the groove structure and uniformly distributed, and in the same clamp unit, adjacent metal rubber blocks are abutted against the trapezoid structure parts and are arranged at equal intervals between the rectangle structure parts.
Preferably, in the pipe vibration damping clip provided by the present invention:
the clamp body is provided with limit bolts which are arranged at two ends of the groove structure and used for limiting and fixing the metal rubber blocks arranged in the groove structure;
The clamp body is provided with a positioning bolt, and the positioning bolt can sequentially penetrate through two adjacent clamp bodies and is used for fixedly connecting the two adjacent clamp bodies.
Preferably, in the pipe vibration damping clip provided by the present invention:
A flat pad, an elastic pad and a nut are matched with the limit bolt;
And the nut is matched with the positioning bolt to form a flat pad, an elastic pad and a nut.
Preferably, in the pipe vibration damping clip provided by the present invention:
the pre-tightening amount of the metal rubber block on the pipeline is related to the density of the metal rubber block;
the cooperation method of the pretension amount of the metal rubber block to the pipeline and the density of the metal rubber block is as follows:
Step S1, according to the preset density ρ of the metal rubber block, the long side L 1 of the lower bottom surface of the metal rubber block, the width W, the total height H of the metal rubber block and the volume of the trapezoid structure part of the metal rubber block Height ofDetermining the weight of the metal rubber block as=ρ×[ +L1×W×(H- )];
S2, determining the height H=A+ (R-D/2) of the metal rubber block according to the radius R of the groove structure on the clamp body, the pipeline diameter D and the pre-tightening quantity A of the preset metal rubber block, wherein the unit before substituting the radius R, the pipeline diameter D and the pre-tightening quantity A into the formula is mm;
step S3, a central angle θ 1 corresponding to the metal rubber block in the clamp unit, a long side L 2 of the upper bottom surface of the metal rubber block, and an outer diameter D of the pipeline, where the stress area s= ;
Step S4, the load born by the metal rubber block is F, and the average pressure P=F/S generated when the metal rubber block is stressed is determined according to the load F and the stressed area S obtained in the step S3;
s5, the density range of the metal rubber block is 1.5-3.0 g/cm 3, the value range of the pre-tightening amount is 0.1-5.5 mm,
Preferably, in the pipe vibration damping clip provided by the present invention:
The matching parameters of the density and the pre-tightening amount of the metal rubber block are that when P is more than or equal to 2N/mm 2, the density is 1.789g/cm 3, the pre-tightening amount is 3.7mm, and when P is less than 2N/mm 2, the density is 2.932g/cm 3, and the pre-tightening amount is 0.45mm.
Preferably, in the pipe vibration damping clip provided by the present invention:
In the step S1, the long side L 1 of the lower bottom surface of the metal rubber block is a fixed value of 47.6mm, and the width W is a fixed value of 10.1mm.
Preferably, in the pipe vibration damping clip provided by the present invention:
In the step S1, the volume of the trapezoid structure portion of the metal rubber block Is a fixed value 4061.83mm 3, heightIs a fixed value of 11.01mm.
Preferably, in the pipe vibration damping clip provided by the present invention:
In the step S2, the pre-tightening amount A is changed only by changing the height of the rectangular structural portion of the metal rubber block, which is H- WhereinIs a fixed value.
Preferably, in the pipe vibration damping clip provided by the present invention:
In the step S1 and the step S2, the mass of the metal rubber block is that =ρ×(0.48076H–1.2332);
Wherein: The unit before substitution formula is g, the unit before substitution formula is g/cm 3, and the unit before substitution formula is H is mm.
Preferably, in the pipe vibration damping clip provided by the present invention:
in the step S3, a central angle θ 1 corresponding to the metal rubber block set in the clamp unit changes with the diameter size of the pipeline;
When the diameter dimensions of the pipes are the same, the central angle θ 1 remains unchanged.
(III) beneficial effects.
Compared with the prior art, the application has the following beneficial effects:
From the above, the invention provides a pipeline vibration-damping clamp, which comprises at least two clamp units (preferably two clamp units), wherein all clamp units can form a pipeline vibration-damping clamp encircling a pipeline (when two clamp units are arranged, the two clamp units are arranged up and down and are fixedly connected through positioning bolts). Specifically, the clamp unit comprises a clamp body (an integrated metal structural member), a groove structure (an arc-shaped groove structure) is formed in the clamp body, a plurality of metal rubber blocks (the metal rubber blocks are provided with trapezoid structure parts and rectangular structure parts) are arranged in the groove structure, the upper bottom surfaces of the metal rubber blocks are abutted against the surface of a pipeline, and the lower bottom surfaces of the metal rubber blocks are abutted against the inner bottom surfaces of the groove structure. The structure of the metal rubber block is particularly limited in that the forming direction of the metal rubber block is consistent with the stress direction of the metal rubber block after the tooling, and the forming direction of the metal rubber block is perpendicular to the upper bottom surface and the lower bottom surface of the metal rubber block. Through the structural design, compared with the prior art, the pipeline vibration reduction clamp provided by the invention at least comprises the following beneficial effects:
1. the density of the metal rubber block and the parameters of the pre-tightening amount are matched, so that the metal rubber block can obtain minimum rigidity under the working condition of the same pressure, the vibration reduction effect of the metal rubber block is improved, and in addition, the service life of the metal rubber block can be properly prolonged by setting the pre-tightening amount;
2. The contact surface between the metal rubber block and the pipeline can be completely clung (namely, the upper bottom surface of the metal rubber block is completely and tightly clung to the surface of the pipeline), and the lower bottom surface of the metal rubber block can be contacted with the inner groove of the clamp as much as possible (the lower bottom surface of the metal rubber block is completely and tightly clung to the inner bottom surface of the upper groove structure of the clamp body), so that the stress of the metal rubber piece is more uniform. The metal rubber block is provided with a trapezoid structure part and a rectangular structure part, when the trapezoid structure part surrounds the pipeline and is in surface contact with the pipeline, the metal rubber block can be completely propped against the pipeline on the contact surface (the upper bottom surface is in contact with the stress surface) of the pipeline due to the trapezoid structure design, and the vibration reduction effect can be improved without gaps between the metal rubber blocks. Meanwhile, the metal rubber block is provided with the rectangular structural part, a small gap (a gap between the rectangular structural parts in the adjacent metal rubber blocks) can be kept against the groove structure on the clamp body (the lower bottom surface of the metal rubber block is in contact with the supporting surface), the contact surface area of the metal rubber block, the stress surface and the supporting surface can be increased by the design, the contact area can be increased, the pressure intensity born by the upper bottom surface and the lower bottom surface of the metal rubber block can be reduced, the bearing capacity of the metal rubber block can be improved, and in addition, the problem that a conventional trapezoid piece cannot be arranged in a groove of a pipe clamp is effectively avoided by the rectangular structural design.
3. The forming mode of the metal rubber block can simultaneously increase the bearing capacity and the damping vibration attenuation effect of the metal rubber block.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
FIG. 1 is a schematic diagram of a vibration-damping clamp for a pipeline in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram showing the relationship between the molding direction and the stress direction of a metal rubber block in a pipe vibration damping clamp according to an embodiment of the present invention;
FIG. 3 is a schematic view of a pipe vibration damping clip according to an embodiment of the present invention;
FIG. 4 is a view in the direction A based on FIG. 3;
FIG. 5 is a view in the B direction based on FIG. 3;
FIG. 6 is a cross-sectional view of a vibration dampening clip of a pipeline along the radial direction of the pipeline in an embodiment of the present invention;
FIG. 7 is a cross-sectional view of a vibration dampening clip of a pipeline along the axial direction of the pipeline in accordance with an embodiment of the present invention;
FIG. 8 is a schematic view of a metal rubber block according to an embodiment of the present invention;
FIG. 9 is a side view of a metal rubber block in an embodiment of the invention;
FIG. 10 is a top view of a metal rubber block according to an embodiment of the present invention;
FIG. 11 is a schematic drawing of metal rubber stamping in an embodiment of the invention;
FIG. 12 is a graph showing the fitting result of the relation between the rigidity of the metal rubber block in the pipe vibration damping clamp and the pressure change in the embodiment of the invention.
The correspondence between the component names and the reference numerals in fig. 1 to 11 is:
The clamp body 1, the metal rubber block 2, an upper bottom surface 21, a lower bottom surface 22, a trapezoid structure part 23, a rectangular structure part 24, a limit bolt 3, a positioning bolt 4, a pipeline 5, a forming die 6 and a forming press block 7.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments. The examples are provided by way of explanation of the invention and not limitation of the invention. Indeed, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For example, shown or described as
Features that are part of one embodiment may be used with another embodiment to yield still a further embodiment. Accordingly, it is intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and their equivalents.
In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "coupled" and "connected" as used herein are to be construed broadly, and may be, for example, fixedly coupled or detachably coupled, or may be directly coupled or indirectly coupled through intermediate members, as will be apparent to those of ordinary skill in the art, in view of the detailed description of the terms.
Referring to fig. 1 to 12, the present invention provides a pipe vibration damping clip with high load bearing and high damping characteristics. In the present invention, the pipe vibration damping clip includes two clips (specifically, clip units, in one embodiment of the present invention, two clip units are provided, the two clip units are disposed up and down on the pipe 5), a plurality of trapezoid metal rubber blocks 2 (the metal rubber blocks 2 have trapezoid structure portions 23), a limit plate, a bolt, a nut, and a limit hole structure. In the invention, the number of the clamp units is preferably two, and an upper-lower matching structure is adopted (specifically, when the clamp is used, one of the two clamp units is in the lower position, the other clamp is in the upper position, the clamp is hooped on the pipeline 5 and then is fixed through matching of a bolt and a nut), a groove structure is arranged in the clamp unit, and limit pieces (used for sealing two sides of the groove structure and enabling the groove structure to form a cavity structure allowing the metal rubber block 2 to be unidirectionally loaded and unloaded) are arranged above the left side and the right side of the groove structure. The groove structure of the clamp unit is internally provided with a plurality of metal rubber blocks 2 with trapezoid structures, the forming direction of the metal rubber blocks 2 is the vertical connection line of the upper bottom surface 21 and the lower bottom surface 22, and in the plurality of trapezoid metal rubber blocks 2, the vertical connection line of the upper bottom surface and the lower bottom surface of each metal rubber block 2 is radially parallel to the clamp, and the bottom surfaces (the lower bottom surfaces 22) of the trapezoid metal rubber blocks 2 are uniformly distributed and arranged along the extending direction of the groove structure on the clamp unit. The clamp unit comprises a clamp body 1, four limiting holes are formed in the left side edge and the right side edge of the clamp body 1, limiting bolts 3 are arranged between the limiting holes, and the limiting bolts 3 fix a plurality of trapezoid metal rubber blocks 2 in a groove structure. Two side wings of the clamp are respectively provided with two parallel positioning holes, positioning bolts 4 are arranged on the positioning holes, and the positioning bolts 4 are connected with the upper half clamp unit and the lower half clamp unit. The positioning bolt 4 is provided with a flat pad, an elastic pad and a pre-tightening nut, and the pre-tightening nut can adjust the pre-tightening amount of the metal rubber block 2 in the pipe clamp. According to the invention, through the structural design of the metal rubber block 2 and the clamp and the control of the forming direction of the trapezoid metal rubber block 2, the bearing capacity and the vibration reduction effect of the pipeline 5 support and hanger are greatly improved, meanwhile, the matching parameters of the density and the pretightening of the metal rubber block 2 are adjusted, the minimum rigidity of the metal rubber block 2 under the same pressure is realized to obtain the maximum damping vibration reduction effect, and the pipeline vibration reduction clamp is high in practicability and can also be prolonged in service life.
The invention particularly provides a pipeline vibration damping clamp with high bearing capacity and high damping characteristic, which comprises a lower half clamp and an upper half clamp (a complete pipeline vibration damping clamp comprises two units, namely a lower half clamp unit and an upper half clamp unit). The lower half clamp unit and the upper half clamp unit are basically consistent in structure, the clamp unit (the lower half clamp unit and the upper half clamp unit) comprises a clamp body 1, a groove structure (the groove structure is an arc-shaped groove, the circle center of the inner arc bottom surface of the groove structure is coaxially arranged with the axis of a pipeline 5), a plurality of trapezoid metal rubber blocks 2 are uniformly arranged in the groove structure, the lower bottom surface 22 (which can be a plane or a curved surface matched with the shape of the groove structure) of the metal rubber blocks 2 is in contact with the inner bottom surface of the groove structure, and the upper bottom surface 21 (which can be a plane or a curved surface matched with the shape of the pipeline) is in close contact with the pipeline 5. A limit bolt 3 and a positioning bolt 4 are arranged on the clamp body 1. The limiting bolt 3 passes through the limiting hole (arranged on the clamp body 1 and penetrates through the clamp body 1 in the direction parallel to the axial direction of the pipeline 5) to limit and fix the metal rubber blocks 2 with the trapezoid structures. The limit bolt 3 is provided with a flat pad, a spring pad and a nut for fixing the limit bolt 3 and preventing the nut from loosening caused by vibration. The positioning bolt 4 passes through the positioning holes arranged on the upper half clamp unit and the lower half clamp unit, and the positioning bolt 4 is provided with a locking spring pad, a flat pad and a pre-tightening nut, and the pre-tightening amount of the trapezoid metal rubber block 2 can be adjusted through the position change of the pre-tightening nut.
The clamp body 1 is provided with the limit bolts 3, and the function is that 1, in the installation process, one limit bolt 3 is firstly arranged on the left side or the right side, then a plurality of (seven) metal rubber blocks are sequentially arranged from one side of the non-arranged limit bolts along a groove structure on the clamp body 1, and finally the rest one limit bolt is arranged.
In the invention, seven metal rubber blocks 2 are arranged in a groove structure on a clamp body 1, and in FIG. 2, the metal rubber blocks at the left and right ends of the outermost metal rubber blocks can ensure the stability of a pipeline in the horizontal direction when the metal rubber blocks 2 are subjected to horizontal lateral force, and can play a main role in vibration reduction, and if 5 metal rubber blocks are designed in a half clamp, the width of the metal rubber blocks is increased according to actual requirements (but the contact surface between the lower bottom surfaces of the metal rubber blocks and the groove structure on the clamp is reduced). In the present invention, the number of the metal rubber blocks 2 is preferably seven, and if the number of the metal rubber blocks is reduced, for example, 5 metal rubber blocks are designed, the contact surface between the upper bottom surface of the metal rubber block and the pipeline and the contact surface between the lower bottom surface and the inner groove of the clip will be reduced, and when the external force is small (when the pre-tightening is also small), the complete contact between the upper bottom surface or the lower bottom surface and the corresponding contact surface cannot be ensured, and the metal rubber blocks cannot exert the optimal performance. In addition, when the metal rubber block 2 is designed to be 5 blocks, as the upper and lower bottom surfaces of the metal rubber block are parallel surfaces (straight), when the pretension is larger or the external load (external force) is applied, the width of the metal rubber block becomes larger, so that a part of the upper bottom surface of the same metal rubber block is deformed more and a part of the upper bottom surface of the same metal rubber block is deformed less, which may cause the problems that the metal rubber block cannot fully exert the vibration damping performance, the internal structure of the metal rubber block is possibly damaged and the service life is reduced, and as for the lower bottom surface, the lower bottom surface of the metal rubber block is also a straight surface, the bottom surface of an internal groove of a clamp is an arc, and the larger the width of the lower bottom surface of the metal rubber block is, the smaller the contact area between the lower bottom surface of the metal rubber block and the bottom surface of the groove is not beneficial to the bearing of the metal rubber. In practical design, the smaller the width of the metal rubber blocks is, the larger the contact area between the upper bottom surface and the lower bottom surface of all the metal rubber blocks in the groove and the corresponding contact surface is, but if the width of the metal rubber blocks is designed to be smaller, the more the number of the metal rubber blocks needed in the half clamp is, and the processing cost and time are increased.
In this embodiment, the metal rubber block 2 is a trapezoid block (the metal rubber block 2 is an integral structure, and includes two parts, namely a trapezoid structure part 23 and a rectangular structure part 24), the molding direction of the metal rubber block 2 is consistent with the stress direction (parallel to the radial direction of the pipeline 5) during operation, namely the vertical connection line direction of the upper bottom surface 21 and the lower bottom surface 22 of the metal rubber block 2, and the molding mode is beneficial to improving the bearing capacity and damping capacity of the metal rubber block 2.
The fact that the molding direction of the rubber block 2 is consistent with the stress direction during operation means that the molding direction of the metal rubber block 2 is parallel with the stress direction during operation, but the directions are opposite, or the stress direction and the molding direction are opposite.
In one embodiment of the present invention, in all the metal rubber blocks 2 provided in the same clamp unit, the sides of the upper bottom surfaces 21 (the sides axially parallel to the pipeline 5 in the mounted state) of the adjacent metal rubber blocks 2 are closely attached together, the upper bottom surfaces 21 of all the metal rubber blocks 2 are closely attached to the pipeline 5, and a fixed space exists between the sides of the lower bottom surfaces 22 of the adjacent metal rubber blocks 2. The contact area between the stress surface (upper bottom surface 21) and the supporting surface (lower bottom surface 22) of the metal rubber block 2 and the pipeline 5 as well as the clamp body 1 is larger, so that the structure of a pipeline is more suitable, and the stress uniformity of the metal rubber block 2 in the clamp is improved.
According to one embodiment of the invention, the metal rubber block 2 has a density ranging from 1.5 to 3.0g/cm 3, such as a typical but non-limiting density of 1.5g/cm3、1.8g/cm3、2.0g/cm3、2.2g/cm3、2.5g/cm3、2.8g/cm3 or 3.0g/cm 3, and a pretension ranging from 0.1 to 5.5mm, such as a typical but non-limiting density of 0.1mm, 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, etc. The value range of the diameter dimension D of the pipeline suitable for the invention is 40-65 mm. The density and pre-tightening parameters of the metal rubber block 2 are preferably that when P is larger than or equal to 2N/mm 2, the density is 1.789g/cm 3, the pre-tightening amount is 3.7mm, and when P is smaller than 2N/mm 2, the density is 2.932g/cm 3, and the pre-tightening amount is 0.45mm.
In a preferred embodiment of the present invention, the long side L 1 of the lower bottom surface 22 of the metal rubber block 2 is a fixed value of 47.6mm, and the width W is a fixed value of 10.1mm. Volume of the trapezoid-shaped structure portion 23 in the metal rubber block 2Is a fixed value 4061.83mm 3, heightIs a fixed value of 11.01mm. In the present invention, the design of the pre-tightening amount A is achieved by merely changing the height of the trapezoid structural portion 23 of the metal rubber block 2 (the metal rubber block 2 is of an integral structure having a trapezoid portion having an upper bottom surface 21 structure for contacting the pipe 5 and a rectangular portion having a lower bottom surface 22 structure for contacting the inner side surface of the groove on the clamp body), namely (H-) Does not changeHeight of the steel plate. According to the preset density ρ of the trapezoid structural portion 23 of the metal rubber block 2, the long side L, the width W of the lower bottom surface 22 of the trapezoid structural portion 23 of the metal rubber block 2, the total height H of the metal rubber block 2, and the volume of the trapezoid structural portion 23 of the metal rubber block 2(Its height is) The weight of the trapezoid structure portion 23 of the metal rubber block 2 is determined to be=ρ×[ +L1×W×(H-)]。
A plurality of metal rubber blocks 2 are uniformly arranged in a groove structure arranged on the clamp unit, the lower bottom surface 22 of the metal rubber block 2 is in contact with the inner bottom surface of the groove structure, and the upper bottom surface 21 of the metal rubber block 2 is in close contact with the surface of the pipeline 5. After passing through the limiting holes, the limiting bolts 3 can fix the metal rubber blocks 2 in the clamp body 1, and flat pads, elastic pads and nuts are arranged on the limiting bolts 3 to fix the bolts and prevent the loosening of the limiting bolts 3 (or the nuts) caused by vibration. The clamp body 1 is provided with a positioning bolt 4, the positioning bolt 4 passes through positioning holes formed in the upper half clamp unit and the lower half clamp unit, a locking spring pad, a flat pad and a pre-tightening nut are arranged on the positioning bolt 4, the pre-tightening amount of the metal rubber block 2 can be adjusted through position variation of the pre-tightening nut (when the pre-tightening nut is screwed, the pre-tightening amount of the metal rubber block 2 is increased, and when the pre-tightening nut is loosened, the pre-tightening amount of the metal rubber block 2 is reduced).
For the metal rubber block 2, the metal rubber block 2 is generally in a trapezoid block structure (with a trapezoid structure portion 23 and a rectangular structure portion 24), and the forming direction (i.e. the vertical connection direction of the upper bottom surface 21 and the lower bottom surface 22) is the same as the stress direction in operation (and is parallel to the radial direction of the pipeline 5), so that the forming manner is beneficial to improving the bearing capacity and damping capacity of the metal rubber. The metal rubber block 2 is subdivided into a trapezoid structure part 23 and a rectangular structure part 24, wherein the trapezoid structure part 23 is provided with an upper bottom surface 21 for abutting against the pipeline 5, and the rectangular structure part 24 is provided with a lower bottom surface 22 for abutting against a groove arranged on the clamp body 1. Be provided with a plurality of metal rubber blocks 2 on same clamp body 1, the last bottom surface 21 side (with pipeline 5 axial parallel's side) of adjacent metal rubber block 2 is hugged closely together, the last bottom surface 21 of all metal rubber blocks 2 can closely be adjacent with pipeline 5, there is fixed interval between the lower bottom surface 22 side (with pipeline 5 axial parallel's side) of adjacent metal rubber block 2, the area increase of contact is carried out between stress surface and holding surface and other structures on the metal rubber block 2, thereby adapt to the structure of pipeline more, improve the stress uniformity of metal rubber block 2 in the clamp unit.
According to the preset density ρ of the metal rubber block 2, the long side L, the width W of the lower bottom surface 22 of the metal rubber block 2, the total height H of the metal rubber block 2 and the volume of the trapezoid structure portion 23 of the metal rubber block 2(Its height is) Determining the weight of the metal rubber block as=ρ×[ +L1×W×(H- ) ]. The long side L1 of the lower bottom surface 22 of the metal rubber block 2 was 47.6mm in fixed value and the width W was 10.1mm in fixed value. Volume of the trapezoid-shaped structure portion 23 on the metal rubber block 2Is a fixed value 4061.83mm 3, heightFixed value 11.01mm.
Mass of metal rubber block 2=Ρ× (4.8076H-1.2332), where,Unit g, ρ unit g/cm 3, and unit mm before H substitution.
The height h=a+ (R-D/2) of the metal rubber block is determined according to the radius R of the groove structure provided on the clamp body 1, the diameter D of the pipe 5, and the pre-set pre-tightening amount a of the metal rubber. Specifically, the diameter D of the pipeline 5 is 51mm, and the radius R of the groove on the clamp is 41.8mm. According to the preset density rho=1.789 g/cm 3 of the metal rubber block, the pre-tightening amount A=3.7 mm of the metal rubber block, so the height of the metal rubber is H=A+ (R-D/2) =20 mm, and the mass of the metal rubber is as follows=Ρ× (0.48076H-1.2332) =15 g. According to the corresponding central angles theta 1 of all the metal rubber blocks 2 in the half-clamp unit, the length L 2 of the bottom surface 21 on the metal rubber blocks 2 and the outer diameter D of the pipeline 5, the stressed area S=of the metal rubber is determined. Specifically, the outer diameter D of the pipeline 5 is 51mm, the central angle θ 1 corresponding to all the metal rubber blocks 2 in the half-hoop body 1 is 165 degrees, and the length L 2 of the bottom surface 21 of the metal rubber is 41mm, so that the stressed area s== 3009.2Mm 3. The metal rubber block 2 receives a load of F, and the average pressure p=f/S generated when the metal rubber is stressed is determined according to the loads F and the stress area S in the step S1.
Except that the density ρ= 2.932g/cm 3 of the metal rubber block 2 is preset in the above step, and the pre-tightening amount a of the metal rubber block 2=0.45 mm, the height of the metal rubber block 2 is h=a+ (R-D/2) =16.75 mm, and the mass of the metal rubber block 2=ρ×(0.48076H–1.2332)=20g。
In another embodiment, in the above step, the diameter dimension D of the pipe 5 is 63mm, the radius R of the groove structure on the clamp is 47.8mm, so the height of the metal rubber block 2 is h=a+ (R-D/2) =20 mm, the corresponding central angle θ 1 of all metal rubbers in the half clamp body 1 is 170 °, and the area stressed by the metal rubbers=3830.0mm3。
In the invention, the pre-tightening amount of the metal rubber block 2 to the pipeline 5 is related to the density of the metal rubber block 2, and the matching method of the pre-tightening amount of the metal rubber block 2 to the pipeline 5 and the density of the metal rubber block 2 is as follows:
Step S1, according to the preset density ρ of the metal rubber block 2, the long side L 1 of the lower bottom surface 22 of the metal rubber block 2, the width W, the total height H of the metal rubber block 2 and the volume of the trapezoid structure portion 23 of the metal rubber block 2 Height ofThe weight of the metal rubber block 2 is determined as=ρ×[ +L1×W×(H- )];
Step S2, determining the height H=A+ (R-D/2) of the metal rubber block according to the radius R of the groove structure on the clamp body 1, the diameter D of the pipeline 5 and the preset pre-tightening amount A of the metal rubber block 2;
Step S3, a central angle θ 1 corresponding to the metal rubber block 2 in the clamp unit, a long side L 2 of the upper bottom surface 21 of the metal rubber block 2, and an outer diameter D of the pipeline 5, and a force bearing area s=of the metal rubber block 2 ;
Step S4, the load born by the metal rubber block 2 is F, and the average pressure P=F/S generated when the metal rubber block 2 is stressed is determined according to the load F and the stressed area S obtained in the step S3;
And S5, the density range of the metal rubber block 2 is 1.5-3.0 g/cm 3, the value range of the pre-tightening amount is 0.1-5.5 mm, and the matching parameters of the density and the pre-tightening amount of the metal rubber block 2 are that when P is more than or equal to 2N/mm 2, the density is 1.789g/cm 3, the pre-tightening amount is 3.7mm, and when P is less than 2N/mm 2, the density is 2.932g/cm 3, and the pre-tightening amount is 0.45mm.
The present invention provides a plurality of comparative examples in common, as follows:
comparative example 1:
This comparative example except that the metal rubber density ρ= 2.602g/cm 3, the pre-tightening amount a=1.45 mm of the metal rubber block, the metal rubber height h=a+ (R-D/2) =17.75 mm, the mass of the metal rubber were preset in step S1 and step S2 =Ρ× (0.48076H-1.2332) =19g, the rest of the procedure is the same as in example 1.
Comparative example 2:
This comparative example except that the metal rubber density ρ=2.441 g/cm 3, the pre-tightening amount a=2.45 mm of the metal rubber block was preset in step S1 and step S2, the metal rubber height was h=a+ (R-D/2) =18.75 mm, the mass of the metal rubber =Ρ× (0.48076H-1.2332) =19g, the rest of the procedure is the same as in example 1.
Comparative example 3:
This comparative example except that the metal rubber density ρ=1.647 g/cm 3, the pre-tightening amount a=5.2 mm of the metal rubber block was preset in step S1 and step S2, the metal rubber height was h=a+ (R-D/2) =21.5 mm, the mass of the metal rubber =Ρ× (0.48076H-1.2332) =15g, the rest of the procedure is the same as in example 1.
Comparative example 4:
This comparative example except that the metal rubber density ρ=2.087 g/cm 3, the pre-tightening amount a=3.2 mm of the metal rubber block was preset in step S1 and step S2, the metal rubber height was h=a+ (R-D/2) =19.5 mm, the mass of the metal rubber =Ρ× (0.48076H-1.2332) =17g, the rest of the procedure is the same as in example 1.
Comparative example 5:
This comparative example except that the metal rubber density ρ=2.441 g/cm 3, the pre-tightening amount a=1.45 mm of the metal rubber block was preset in step S1 and step S2, the metal rubber height was h=a+ (R-D/2) =18.75 mm, the mass of the metal rubber When the central angle theta 1 corresponding to all the metal rubbers in the half clamp in the S3 step is 170 DEG, the area stressed by the metal rubbers is= 3830.0Mm 3, the rest of the procedure is the same as in example 1.
The invention provides static compression test and dynamic compression damping performance test for the clamp after matching different parameters for each example and comparative example, and the specific results are shown in tables 1, 2 and 3.
In the static compression test, the pipeline 5 in the clamp is slowly applied to 20000N target load, multiple groups of load values are selected according to the collected load-displacement data, and a rigidity formula is adoptedAnd calculating and selecting a rigidity value corresponding to the load. The specific results are shown in Table 1.
And calculating the pressure to which the metal rubber is subjected when the load is applied according to the ratio of P=F/S, and fitting the static data result by adopting the relation of rigidity and pressure change, wherein the fitting result is shown in fig. 12.
The dynamic compression damping performance test is divided into two groups, wherein one group of detection parameters are that the preload is 2kN, the detection frequency is 8Hz, the amplitude is 0.3mm, the specific experimental result is shown in table 1, the other group of detection parameters are that the preload is 9kN, the detection frequency is 8Hz, the amplitude is 0.3mm, and the specific experimental result is shown in table 3.
Wherein, the average pressure of the metal rubber is lower than 2N/mm 2 in the test with the preload of 2kN, and is higher than 2N/mm 2 in the test with the preload of 9 kN.
In the step S1, the long side L 1 of the lower bottom surface 22 of the metal rubber block 2 was set to 47.6mm and the width W was set to 10.1mm. Volume of the trapezoid-shaped structure portion 23 on the metal rubber block 2Is a fixed value 4061.83mm 3, heightIs a fixed value of 11.01mm.
In the above step S2, the pre-tightening amount A is designed by changing the height of the rectangular structural portion 24 of the lower portion of the metal rubber block 2 only, namely (H-) Not changeHeight of the steel plate. In the above steps S1 and S2, the mass of the metal rubber block 2 satisfies=Ρ× (0.48076H-1.2332), where the metal rubber height satisfies the formula h=a+ (R-D/2),Unit g, ρ unit g/cm 3, and unit mm before H substitution.
In the step S3, the central angles θ 1 corresponding to all the metal rubber blocks 2 in the clamp unit are changed along with the size of the pipeline 5, and when the sizes of the pipelines 5 are the same, the central angles θ 1 are kept unchanged (the central angles θ 1 are kept unchanged specifically that 1, the central angles θ 1 corresponding to all the metal rubber blocks 2 arranged in the same clamp unit are unchanged, and 2, in different pipelines 5, if the diameters of the pipelines 5 are the same, the central angles θ 1 corresponding to the metal rubber blocks 2 arranged in the clamp unit are unchanged. The average pressure is used as an evaluation influence factor for selecting the matching method of the density and the pre-tightening amount of the metal rubber block 2 in the actual working condition.
The shaping direction of metal rubber piece 2 is perpendicular to its upper and lower bottom surfaces 21 and 22, and the shaping direction is unanimous with the atress direction (atress direction is radial parallel with the pipeline) behind the metal rubber piece 2 frock, and the latter half of metal rubber piece 2 can slide into the clamp along clamp upper groove structure.
The upper half clamp unit and the lower half clamp unit have the same size, shape and structure, and all the same batch of trapezoidal metal rubber blocks 2 in the clamp are the same in size, shape and structure.
For the whole pipeline vibration reduction clamp, the upper half clamp unit and the lower half clamp unit are fixedly connected through a positioning bolt 4, an external thread part is arranged on the positioning bolt 4, and a flat pad, an elastic pad and a pre-tightening nut clamped on the upper side of the upper clamp are screwed on the external thread part of the positioning bolt 4.
Through the structural design, compared with the prior art, the pipeline vibration reduction clamp provided by the invention at least comprises the following beneficial effects:
1. The density and the pre-tightening amount of the metal rubber block 2 are matched with each other, so that the metal rubber block 2 can obtain minimum rigidity under the working condition of the same pressure, and the vibration reduction effect of the metal rubber block 2 is improved;
2. The contact surface between the metal rubber block 2 and the pipeline 5 can be completely clung (namely, the upper bottom surface 21 of the metal rubber block 2 is completely and tightly clung to the surface of the pipeline 5), and the lower bottom surface 22 of the metal rubber block 2 can be contacted with the inner groove of the clamp as much as possible (the lower bottom surface 22 of the metal rubber block 2 is completely and tightly clung to the inner bottom surface of the groove structure on the clamp body 1), so that the stress of the metal rubber piece is more uniform. According to the invention, a certain pressure can be applied to the metal rubber block 2 (the metal rubber block 2 is pressed between the pipeline and the clamp body), so that the upper bottom surface 21 and the lower bottom surface 22 of the metal rubber block 2 are deformed, and the bonding tightness between the metal rubber block 2 and the pipeline 5 and the groove structure can be improved.
3. The forming mode of the metal rubber block 2 can simultaneously increase the bearing capacity and the damping vibration attenuation effect of the metal rubber block 2.
TABLE 1a
TABLE 1b
TABLE 1c
TABLE 2
TABLE 3 Table 3
In the present invention, the data included in table 1 are large, and for the sake of clarity of presentation, table 1 is divided into table 1a, table 1b, and table 1c for presentation of data.
The rigidity comprises two types, namely static rigidity and dynamic rigidity, namely the static rigidity is the result tested in a static test and the dynamic rigidity is the result tested in a dynamic test. The stiffness in table 1 represents the static stiffness and is directly noted as the dynamic stiffness in tables 2 and 3.
As can be seen from the fitting results of the relation between the rigidity and the pressure change in tables 1,2, 3 and the results of FIG. 12, when the pressure P of the metal rubber is more than or equal to 2N/mm 2, the metal rubber is selected to have a density of 1.789g/cm 3 and a pre-tightening amount of 3.7mm, and when the pressure P of the metal rubber is less than 2N/mm 2, the metal rubber is selected to have a density of 2.932g/cm 3 and a pre-tightening amount of 0.45mm. The rigidity of the metal rubber block is minimum, and the damping efficiency of the clamp device is higher.
For the metal rubber block 2, the metal rubber block is of an integral structure, and is specifically formed by pressing a forming die 6 and a forming pressing block 7 in a matched mode.
The above is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A vibration-damping clamp for a pipe line, comprising:
at least two clamp units, wherein all the clamp units form a pipeline vibration reduction clamp encircling a pipeline;
the clamp unit comprises a clamp body, a groove structure is arranged on the clamp body, a plurality of metal rubber blocks are arranged in the groove structure, the upper bottom surfaces of the metal rubber blocks are propped against the surface of a pipeline, and the lower bottom surfaces of the metal rubber blocks are propped against the inner bottom surface of the groove structure;
the forming direction of the metal rubber block is consistent with the stress direction after the metal rubber block is assembled, and the forming direction of the metal rubber block is perpendicular to the upper bottom surface and the lower bottom surface of the metal rubber block;
The metal rubber block comprises a trapezoid structure part and a rectangular structure part, wherein the trapezoid structure part is provided with the upper bottom surface, and the rectangular structure part is provided with the lower bottom surface;
The metal rubber blocks are sequentially arranged and uniformly distributed in the groove structure, and in the same clamp unit, adjacent metal rubber blocks are abutted against each other by the trapezoid structure part and are arranged at equal intervals between the rectangle structure parts;
the clamp body is provided with limit bolts which are arranged at two ends of the groove structure and used for limiting and fixing the metal rubber blocks arranged in the groove structure;
the clamp body is provided with a positioning bolt, and the positioning bolt sequentially penetrates through two adjacent clamp bodies and is used for fixedly connecting the two adjacent clamp bodies.
2. The line vibration damping clip of claim 1, wherein,
A flat pad, an elastic pad and a nut are matched with the limit bolt;
And the nut is matched with the positioning bolt to form a flat pad, an elastic pad and a nut.
3. The line vibration damping clip of claim 1, wherein,
The pre-tightening amount of the metal rubber block on the pipeline is related to the density of the metal rubber block;
the cooperation method of the pretension amount of the metal rubber block to the pipeline and the density of the metal rubber block is as follows:
Step S1, according to the preset density ρ of the metal rubber block, the long side L 1 of the lower bottom surface of the metal rubber block, the width W, the total height H of the metal rubber block and the volume of the trapezoid structure part of the metal rubber block Height ofDetermining the weight of the metal rubber block as=ρ×[+L1×W×(H-)];
S2, determining the height H=A+ (R-D/2) of the metal rubber block according to the radius R of the groove structure on the clamp body, the pipeline diameter D and the pre-tightening quantity A of the preset metal rubber block, wherein the unit before substituting the radius R, the pipeline diameter D and the pre-tightening quantity A into the formula is mm;
step S3, a central angle θ 1 corresponding to the metal rubber block in the clamp unit, a long side L 2 of the upper bottom surface of the metal rubber block, and an outer diameter D of the pipeline, where the stress area s= ;
Step S4, the load born by the metal rubber block is F, and the average pressure P=F/S generated when the metal rubber block is stressed is determined according to the load F and the stressed area S obtained in the step S3;
And S5, the density range of the metal rubber block is 1.5-3.0 g/cm 3, and the value range of the pre-tightening amount is 0.1-5.5 mm.
4. A pipe vibration reducing clamp according to claim 3, wherein,
In the step S1, the long side L 1 of the lower bottom surface of the metal rubber block is a fixed value of 47.6mm, and the width W is a fixed value of 10.1mm.
5. The line vibration reduction clamp according to claim 4, wherein,
In the step S1, the volume of the trapezoid structure portion of the metal rubber blockIs a fixed value 4061.83mm 3, heightIs a fixed value of 11.01mm.
6. The line vibration reduction clamp according to claim 5, wherein,
In the step S2, the pre-tightening amount A is changed only by changing the height of the rectangular structural portion of the metal rubber block, which is H-WhereinIs a fixed value.
7. The line vibration reduction clamp according to claim 6, wherein,
In the step S1 and the step S2, the mass of the metal rubber block is that=ρ×(0.48076H–1.2332);
Wherein: The unit before substitution formula is g, the unit before substitution formula is g/cm 3, and the unit before substitution formula is H is mm.
8. The line vibration reduction clamp according to claim 7, wherein,
In the step S3, a central angle θ 1 corresponding to the metal rubber block set in the clamp unit changes with the diameter size of the pipeline;
When the diameter dimensions of the pipes are the same, the central angle θ 1 remains unchanged.
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| 环形金属橡胶隔振器弹性参数的确定;夏宇宏等;润滑与密封;20050515(第03期);正文第35页右栏第3段 * |
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