JPS6014683A - Vibration damper for piping - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piping vibration isolator, and more specifically, it allows piping to expand and contract due to temperature changes, damps vibrations caused by fluid flow in the piping, and further dampens vibrations caused by seismic motion. This invention relates to a piping vibration isolator that has functions such as dispersing seismic forces generated in a piping system.

Conventional piping vibration isolators include ■Spring type vibration isolators, ■Hydraulic type vibration isolators, etc., but ■ has a relatively simple structure and can easily increase the natural frequency of the entire piping system. Although it has the advantage of being able to avoid resonance vibrations caused by external disturbances, it has the disadvantage of restricting the expansion and contraction of the piping due to temperature changes, and that large-capacity devices are subject to restrictions due to the manufacturing aspects of the spring. In addition, ■ can well damp resonance vibrations, and can freely follow the expansion and contraction of piping due to temperature changes without being constrained.
Although it has the advantage of being able to manufacture large-capacity products relatively freely, it has poor response to minute amplitude vibrations or high-frequency vibrations, and cannot be expected to be effective, and the sealing material is constantly being used. There are drawbacks such as the possibility of damage to the sealing material due to internal stress.

Therefore, the applicants first applied for patent application No. 56-156177.
No. (hereinafter referred to as prior art) proposed a pipe support device that eliminated the above-mentioned drawbacks and was able to achieve an effective damping function. FIG. 1 shows the prior art pipe support device. This device consists of a fixed base C having a surrounding wall on the upper surface of a fixed flat plate a, a movable plate e having a spacer d protruding from the lower surface so as to be able to slide into the surrounding wall of the fixed base C, and a movable plate e having a spacer d projected on the lower surface thereof. The gap g between the upper surface of the fixed flat plate a and the lower surface of the movable plate e in the surrounding wall is filled with viscous fluid, and the fixed base C A dustproof cover i is provided between the upper surface of the surrounding wall and the upper surface of the movable plate e. Now, when the pipe P receives a force to displace it, the support stand f and the movable plate e that fixed the pipe P are slidably supported on the fixed stand C via the spacer d, so the chain pipe P is displaced in the direction of displacement. Move to. Here, since the gap g between the lower surface of the movable plate e and the upper surface of the fixed flat plate a is filled with viscous fluid, viscous shear resistance will act here, and the movable plate e will be interlocked with this. The rapid movement of the pipe P is restrained by the viscous shear resistance force and stops.

This prior art pipe support device has various excellent features, in particular, vibration displacements can be smoothly absorbed regardless of their speed or amplitude, which is required for conventional oil dampers. There is no need for a sealing device, and there is no performance deterioration due to seal damage.

By the way, this prior art piping support device has no problems in piping systems where the pipes are placed horizontally to the pedestal, but when used in piping systems where the pipes are placed vertically to the pedestal, or when the pipes are placed against the pedestal. In a piping system that has a horizontal section and a vertical section (including oblique sections), an upward lift force (a force that lifts the pipe upward) acts on the pipe due to expansion and contraction due to temperature changes or earthquake motion, and this The upward lifting force causes a change in the gap g (increasing the gap) between the lower surface of the movable plate e of the support device and the upper surface of the fixed plate a, resulting in a problem of deterioration of the damping function.

The present invention has been made to solve the problems of the prior art described above, and effectively utilizes the vibration absorption effect of the viscous shear resistance force generated by the relative movement between the two surfaces of a viscous body interposed in the gap between the two surfaces. Provide a means to restrain the upward lifting force acting on the piping,
The technical objective is to obtain a piping vibration isolator that prevents as much as possible the change in the gap between the two surfaces caused by the above lifting force and does not change the damping function.

In order to achieve the above-mentioned technical problem, the present invention adopts the following configuration (technical means). That is, (1) a casing, a first movable body movably installed within the casing, a second movable body movably installed within the casing and on the first movable body, and the second movable body; Consisting of a support fixed on the body and a viscous material filled in the casing,
The casing is composed of a bottom plate, a rectangular surrounding wall provided on the top surface of the bottom plate, and an upper plate having an opening in the center and a protrusion around the periphery of the opening; The body is
A sliding member having a substantially rectangular shape, each of which has a standing wall on one of its opposing sides, and a groove formed between the two standing walls, and which is fixed and protrudes from the bottom surface of the sliding member. is placed so as to be movable in a direction perpendicular to the direction along the groove with a small gap between it and the bottom plate of the casing, and the first movable body is attached to the bottom plate of the casing in the groove. The second movable body is engaged with the fixed locking member, and (1) the second movable body has a substantially rectangular shape, has shoulder portions on each of its opposing sides, and is fixedly protruding from the bottom surface thereof. The second movable body is placed so as to be movable in the direction along the groove of the first movable body with a small gap between it and the groove of the first movable body through a sliding material, and the second movable body is connected to the movable body at its shoulder. It is engaged with a locking plate fixed to the vertical wall of ■
The support body is loosely inserted into an opening in the upper plate of the casing and fixed to the upper surface of the second movable body, and the support body has a lid body with a hanging portion on the periphery of the support body, which is attached to the upper plate of the casing. (1) is fixed with a moving area between the outer circumferential surface of the protruding part of the upper plate of the casing and the hanging part of the lid body; It is characterized by being filled with a viscous material that fills a minute gap between the bottom plate, the first movable body, and the second movable body.

In the above configuration, for a pipe placed horizontally with respect to the pedestal, a fixing plate is attached to the support body to which the lid is fixed, and the fixing means (fixing base) is placed on the fixing plate. An embodiment is adopted in which the tube is fixed to a fixed stand. In addition, for a pipe arranged perpendicularly to the frame, a mode is adopted in which the pipe is connected to a fixing means (bracket) mounted on the fixing plate by, for example, a link mechanism.

The sliding members provided on the bottom surfaces of the first movable body and the second movable body so as to protrude from the bottom surfaces respectively are provided on the bottom plate of the casing on which the first movable body is placed and the first movable body on which the second movable body is placed. A holding member interposed between the groove of the movable body to allow smooth sliding of the first movable body and the second movable body and to maintain a minute gap between the two, which also serves as a so-called spacer. It is. The sliding members are provided on the bottom surfaces of the first movable body and the second movable body, respectively, along the moving direction of the movable bodies in a band shape or scattered at appropriate intervals. The sliding material used is a copper alloy, a multi-layer material in which a copper-based sintered alloy layer containing graphite is integrally adhered to a thin steel plate, or a synthetic resin. It can be installed by welding, gluing, or burying a portion of it so that it protrudes from the bottom surface.

The viscous material filled in the casing is not only a normal viscous material such as silicone oil, but also a highly viscous material such as polyisobutylene, polypropylene, polybutene, dimethylpolysiloxane, etc. in order to particularly improve damping characteristics. A molecular viscous material or asphalt is used.

The vibration isolator having the above-mentioned configuration is capable of displacing a pipe disposed horizontally or vertically to the frame in any direction along the pipe axis or perpendicular to the pipe axis. This occurs as a relative movement between two surfaces in a minute gap between the movable body and the casing bottom plate or the second movable body and the groove of the first movable body. However, since the minute gap is filled with a viscous material, viscous shear resistance acts here. In other words, the viscous shear resistance force is generally proportional to the viscosity coefficient of the viscous body, the area of two surfaces moving relative to each other through the viscous body, and their relative speed, and inversely proportional to the gap distance between the two surfaces. The resistance force acts in a direction that stops the movement of the first movable body or the second movable body of the device, and by extension, the tube that is linked thereto.

Since the gap distance between the two surfaces is minute and the relative area of the plate surfaces is large, the resistance force acting between the two surfaces is extremely large, and rapid movement of the tube is immediately restrained.

And when using a high viscosity polymer viscous body as the viscous body,
This trend will become even more pronounced. In other words, this viscous body has non-Newtonian fluid properties, that is, pseudoplastic fluid properties (a phenomenon in which the higher the velocity of the fluid, the easier it is to change from high viscosity to low viscosity and flow, and the degree of increase in resistance force becomes smaller.Resistance force (is approximately proportional to the speed to the 0°5 to 0.6 power), and the generation of the resistance force is constant regardless of the displacement amplitude and vibration frequency as long as the speed is the same, and when a constant speed is given, the resistance force is Since the resistance force shows a rise like a rectangular wave, it is extremely sensitive to vibration and has the characteristics of excellent quick response.

As a result, the kinetic energy of the tube is quickly absorbed, and harmful stress caused by vibration is not generated in each component of the device.

Even if upward lifting force is applied to the piping, the first movable body of this device is connected to the locking member fixed to the casing bottom plate, and the second movable body is connected to the locking member fixed to the vertical wall of the first movable body. The gaps between the concave groove top surface of the first movable body and the hook portion of the locking member that are engaged with the plate and the gaps between the shoulder top surface of the second movable body and the locking plate are formed to be extremely small. Therefore, the minute gaps between the first movable body and the casing bottom plate and the second movable body and the groove of the first movable body do not change as much as possible, and the viscous shear of the viscous body due to the change in the minute gaps does not change. There is no change in resistance.

The vibration isolating device of the present invention has the structure and function as on paper,
Compared to conventional products, it has the following various superior effects.

■ This device is equipped with a means for restraining the upper lift force that acts on the pipe due to temperature changes or seismic motion, and even if the upper lift force is applied, the device is able to control the movement between the two surfaces, that is, the first movable body, the casing bottom plate, and the casing bottom plate. Since the minute gap between the second movable body and the groove of the first movable body does not change and is kept as constant as possible, the viscous shear resistance force of the viscous body due to the change in the gap is reduced. There is no change (decrease).

- Vibration displacement transmitted to this device is smoothly absorbed by the good velocity-resistance characteristics of the viscous body, and the displacement stops quickly. In particular, even minute vibrations are quickly absorbed, so even if the vibrations match the natural vibrations of the piping (resonant vibrations), the response value can be reduced.

(2) The resistance due to viscous shear does not increase the internal pressure inside the viscous body, and therefore there is no need for a sealing device required for conventional oil dampers, and there is no deterioration in performance due to damage to the seal.

Hereinafter, the present invention will be explained in more detail with reference to embodiments shown in FIGS. 2 to 6 of the accompanying drawings.

Figures 2 to 4 show the structure of an embodiment of the vibration isolator of the present invention. - In the figures, 1 is a rectangular casing fixed to a frame (not shown), and the casing l is A bottom plate 2, a rectangular surrounding wall 3 provided on the upper surface of the bottom plate 2, and an upper plate 6 that covers the opening of the surrounding wall 3 and has an opening 4 in the center and a protrusion 5 on the periphery of the opening 4. It is formed. In this embodiment, an example is shown in which the aperture 4 provided in the upper plate 6 is a circular hole, and the protrusion 5 provided at the periphery of the aperture 4 is a cylindrical protrusion.

Reference numeral 7 denotes a first movable body disposed within the casing 1, and the first movable body 7 has a rectangular shape, and is provided with a standing wall portion 8.8 on one side facing each other, and the standing wall portion 8. Part 8
．． A groove 9 is formed between the grooves 8 and 8. 1O110 protrudes from the bottom surface of the first movable body 7 and is attached to the first movable body 7.
This is a band-shaped sliding material provided along the groove 9 of the slider. Thus, the first movable body 7 is placed on the bottom plate 2 of the casing l through a small gap S through the sliding material lO provided on the bottom surface.
1 and is placed so as to be movable in the direction orthogonal to the groove 9.

11.11 is the first movable body 7 on the bottom plate 2 of the casing 1;
The locking material 1 is fixed across the concave groove 9 of the locking material 1.
1 is provided with a hook portion 12 at its upper end. The hook portion 12 of the locking member 11 is engaged with the upper surface of the groove 9 of the first movable body 7 with a small gap. This engagement restrains the first movable body 7 from floating upward and also prevents the first movable body 7 from floating upward.
Movement of the movable body 7 in the direction along the groove 9 is restricted.

Reference numeral 13 denotes a second movable body disposed in the groove 9 of the first movable body 7. The second movable body 13 has a rectangular shape, and has shoulder portions 14 and 14 on one side facing each other. We are prepared. Reference numeral 15.15 denotes a band-shaped sliding member provided on the bottom surface of the second movable body 13, protruding from the lower surface and along the shoulder portion l4.14. Thus, the second movable body 13 is moved to the first movable body 7 via the sliding material 15 provided on the bottom surface.
It is placed on the concave groove 9 with a minute gap S2, and is movable in the direction along the concave groove 9.

Reference numeral 16.16 denotes locking plates fixed to the vertical walls 8.8 of the first movable body 7, facing each other, and the locking plates 16.1
One end of each of the opposing ends of the grooves 6 protrudes toward the groove 8, respectively. The locking plate 16.16 has a second locking plate disposed in the groove 8.
They are respectively engaged with the shoulders 14 and 14 of the movable body 13 with a small gap between them and the upper surface of the shoulders. Due to this binding, the second
The upward floating of the movable body 13 is restricted.

17 is a support fixed to the upper surface of the second movable body 13, and the end of the support 17 is inserted into the circular hole 4 of the casing upper plate 6.
It is loosely inserted into the hole 4 and projects upward from the end surface of the cylindrical protrusion 5 on the periphery of the circular hole 4. A gap S3 corresponding to the movement range of the first movable body 7 and the second movable body 13 is formed between the outer circumferential surface of the support body 17 and the inner circumferential surface of the circular hole 4.

Reference numeral 18 designates a lid body fixed to the support body 17 that protrudes from the end surface of the cylindrical protrusion portion 5 of the casing upper plate 6. The lid body 1
8 is provided with a hanging part 19 on its peripheral edge, and the lid lB
covers the circular hole 4 of the casing upper plate 6, and is arranged with a gap S4 corresponding to the movement range between the outer peripheral surface of the cylindrical protrusion 5 and the hanging part 19.

Reference numeral 20 denotes a sealing material fixed to the outer circumferential surface of the cylindrical protrusion 5 of the casing upper plate 6, surrounding the outer circumferential surface;
The upper end surface of the cover 18 is in sliding contact with the lower surface of the lid 18. Reference numeral 21 denotes a sealing material fixed to the outer circumferential surface of the peripheral hanging portion 19 of the lid 18 so as to surround the outer circumferential surface, and the lower end surface of the sealing material 21 is in sliding contact with the upper surface of the casing upper plate 6.

22 is a fixing plate located on the lid 18 and fixed to the support 17 to which the lid 18 is fixed. A member such as a fixing stand is fixed on the fixing plate 22, and a pipe arranged horizontally or vertically to the stand is directly or indirectly connected to the member.

23 is a viscous material filled in the casing l.

Next, the manner in which the above-mentioned vibration isolator and the pipe are attached will be explained.

Figure 5 shows how the vibration isolator is installed on the pipe P placed horizontally to the pedestal, and Figure 6 shows how the vibration isolator is installed to the pipe P placed vertically to the pedestal. Installation indicates condition.

That is, in FIG. 5, the support 17 is placed on the lid 18 of the vibration isolator.
Fixed plate fixed to and arranged? A fixed stand 24 is fixed on the mount z, and a pipe P arranged horizontally with respect to the frame (not shown) is fixed to the fixed stand 24. In this mounting mode, the vibration isolator also has a supporting function of supporting the load of the pipe P and the fluid flowing inside the pipe P.

However, when looking at the response of the vibration isolator in the above-mentioned installation mode to the displacement of the pipe P, when the chain pipe P is displaced in the pipe axial direction X due to expansion and contraction due to temperature change, this displacement occurs relatively gently. Therefore, since the relative movement between the two surfaces, that is, the minute gap S2 between the second movable body 13 and the groove 9 of the first movable body 7, occurs slowly, the viscosity that exists between the two surfaces The viscous shear resistance of the body 23 is also small, allowing the displacement without resistance.

When the pipe P is suddenly displaced due to earthquake motion in the pipe axis direction This results in rapid relative movement between the two surfaces in the minute gaps St and S2 between the casing bottom plate 2 and/or the second movable body 13 and the groove 9 of the first movable body 7. However, since the viscous body 23 is present in the minute gaps S1 and S2, a large viscous shear resistance acts there, and the movement (displacement) of the pipe P is immediately restrained by this resistance.

Moreover, FIG. 6 shows the vibration isolator and the pipe P connected by a link mechanism.

That is, brackets 25 and 25 (hereinafter referred to as brackets with a fixing plate) are fixed facing each other on a fixing plate 22 fixed to a support 17 on the lid 18 of the vibration isolator, and the fixing plate The bin 26 is fixed between the attached brackets 25 and 25. On the other hand, brackets 27 and 27 (hereinafter referred to as brackets with tubes) are fixed to the tubes P so as to face each other, and the bottle 28 is fixed between the brackets 27 and 27 with tubes. A connecting rod 29 is arranged rotatably around the pin axis between the bin 26 fixed between the brackets 25 and 25 with fixed plates and the bin 28 fixed between the brackets 27 and 27 with tubes. The device and the pipe P are connected. In this mounting mode, the pipe P is separately supported by another support device, such as a spring support I.

Considering the response of the present vibration isolator to the displacement of the pipe P in the above-mentioned mounting mode, when the chain pipe P is displaced in the pipe axial direction 27 moves upward and downward in the tube axis direction X with the displacement of the chain pipe P, and the bracket 27 with the tube
Connecting rod 2 rotatably mounted to 7 by means of a pin 28
Similarly, one end of the tube 9 moves as the tube bracket 27 moves.

As one end of the connecting rod 29 moves, the other end of the connecting rod 29 moves in the direction of the pipe P or in the direction away from the pipe P. The displacement of the connecting rod 29 is caused by a slight displacement between the first movable body 7 and the casing bottom plate 2 via the second movable body 13 to which the bracket 25 with a fixed plate that supports the connecting rod 29 is fixed. This occurs as a relative movement between the two surfaces in the gap Sl, but the relative displacement between the two surfaces due to this relative movement is small compared to the amount of expansion and contraction of the pipe P, and the displacement of the pipe P occurs gradually. Viscous body 23 interposed between two surfaces
The viscous shear resistance is also small, allowing the displacement without resistance.

Then, due to the earthquake motion, the pipe P suddenly moves in the direction Y perpendicular to the pipe axis.
Z, or further in the composite direction of directions Y and Z perpendicular to the tube axis, in response to this rapid displacement, the connection rod 29 is used to move between the two surfaces, that is, the first movable body 7 and the casing bottom plate 2, and/or the first movable body 7 and the casing bottom plate 2. This results in rapid relative movement between the two surfaces in the minute gaps S1 and S2 between the second movable body 13 and the groove 9 of the first movable body 7.

However, since the viscous body 23 is present in the minute gaps S1 and S2, a large viscous shear resistance acts there, and this resistance causes the displacement of the connecting rod 29, in other words, the pipe P.
The movement (displacement) of is immediately restrained.

In the above-described manner in which the vibration isolator and the pipe P are mounted in FIGS. and its upward displacement is restrained by the locking plate 16, and since both are engaged with a small gap, the gap between the two surfaces, that is, the first movable body 7, the casing bottom plate 2, and the second Since the minute gaps Sl and S2 between the movable body 13 and the groove 9 of the first movable body 7 do not change as much as possible even with the upward lifting force, the damping function decreases due to a change in the distance between the two surfaces. doesn't happen.

[Brief explanation of the drawing]

Fig. 1 is a pipe vibration isolator of the prior art, Fig. 2 is a longitudinal sectional view of a vibration isolator showing an embodiment of the present invention, and Fig. 3 is a pipe vibration isolator of the prior art.
Figure 4 is a perspective view showing the -■ line broken sectional view, and Figures 5 and 6 are cross-sectional views showing the state of the vibration isolator and the tube. l... Casing 7... First movable body 10... Sliding material 11... Locking material 13... Second town moving body 15 ...Sliding material 16 ... Locking plate 17 ... Support body 18 ... Lid body 22 ... Fixed plate 2
3... Viscous body Sl, S2, S3, S4...
・・・Gap patent applicant Hijiki Ike 1) Oiles Industries Co., Ltd. Representative Patent Attorney Hitoshi

Claims (1)

[Claims] 1. A casing (1); a first movable body (7) movably installed within the casing (1); 7) A second movable body (13) movably installed above, and the second movable body (13)
a support (17) fixedly mounted on the casing (1);
The casing (1) includes a bottom plate (2) and a viscous body (23) filled therein.
It consists of a rectangular surrounding wall (3) provided on the upper surface, and an upper plate (6) having an opening (4) in the center and a protrusion (5) around the periphery of the opening (4). , the first movable body (7) has a substantially rectangular shape, and is provided with an upright wall portion (8) on one of its opposing sides, and the compatible wall portion (8).
A concave groove (8) is formed therebetween, and a micro gap (Sl) is formed with the bottom plate (2) of the casing via a sliding member (1G) that is fixed and protrudes from the bottom surface of the groove. The first movable body (7) is placed so as to be movable in a direction perpendicular to the direction along the groove (9), and the first movable body (7) is fixed to the bottom plate (2) of the casing (1) in the groove. The second movable body (13) is engaged with a locking member (11), and has a substantially rectangular shape, and has shoulder portions (14) on one of its opposing sides, and has a shoulder portion (14) from its bottom surface. It moves in the direction along the groove (9) of the 15'f moving body (7) through a protruding and fixed sliding member (15) through a minute gap (S2) with the groove (8) of the 15'f moving body (7). be placed so that it is possible to do so, and
The second movable body (13) has a first movable body (13) at its shoulder (14).
Locking plate' (1B) fixed to the vertical wall part (8) of the movable body
The support body (17) is loosely inserted into the opening (4) of the second plate (6) of the casing page 1) and the second movable body (13) is engaged with the second movable body (13).
), the support (17) has a lid (18) with a hanging part (19) on its periphery, which covers the opening (4) in the upper plate of the casing and The protruding part (5) of the upper plate is fixed with a moving area (S4) between the outer circumferential surface and the hanging part (19) of the lid, and at least the part of the casing is fixed in the casing (1). Bottom plate (2) and the first
A minute gap (St
, S2) is filled with a viscous material (23) that satisfies S2).