JPS58156743A - Damper - Google Patents

Abstract

PURPOSE:To obtain rapidly and surely locking state by a structure wherein a damper ring rotating integrally with a ball screw part is jointed through rolling elements to an inertia body and the damper ring and the inertia body are separated from each other by utilizing the inertia of the inertia body in case that the load is applied abruptly. CONSTITUTION:When an inner tube 3 sluggishly displaces with respect to an outer tube 1, a rotating rod 9 equipped with the ball screw part 11 threadingly fitted to a ball nut 4 is slowly rotated and the damper ring 12 and the inertia body 15 are also rotated together with the rotating rod 9. When the inner tube 3 abruptly displaces with respect to the outer tube 1, the rotating rod 9 is rapidly rotated, while the damper ring 12 rotating integrally with the rotating rod 9 causes steel balls 24 to roll within recesses 22 and 23, because the inertia body 15 tends to keep its stationary state due to its inertia, resulting in shifting the damper ring 12 leftward and consequently bringing the flange 12b of a damper ring 12 into contact with a damper ring receiver 25 by compressing a coiled spring 20 and finally in checking the rotation of the damper ring 12 in order to realize the locking state.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration damper used for protecting piping, etc. in thermal power plants and chemical plants, for example.

This type of vibration damper connects a structure and the piping attached to it, and when the piping or other object to be damped is displaced at an extremely low speed due to normal thermal expansion, it is suppressed without restraining it. The vibrator itself expands and contracts to absorb displacement, and when subjected to vibrations and shock loads caused by earthquakes, water hammer, etc., it becomes locked, preventing displacement of the object to be damped and protecting it. Afterwards, when the vibration and impact load disappear, the locked state between the trout is released, and various types of vibration dampers are known in the art.

An object of the present invention is to enable the above-mentioned vibration damper to turn into a four-quarter state extremely quickly and completely when a single vibration and shock load is applied, thereby protecting the objects to be damped, such as piping. Furthermore, if these loads continue, the lock state can be loosened, eliminating the buildup inside the piping, etc., and thereby ensuring the protection of the object to be damped. Moreover, since it is mechanical, there is little need for subsequent maintenance and management, and the aim is to provide a structure that can withstand long-term use.

This invention will be explained below based on embodiments shown in the drawing numbers.

In this specification, "left and right" refers to FIG. 1, and "left" refers to the left side in FIG. 1, and "right" refers to the right side in the same figure.

In the drawing, (1) is the outer cylinder of the damper, which has a left half (1a) with a large diameter and a left side wall (lo) with a first locking part (2), and a left half (1a) with a large diameter on the right end thereof. It consists of a right half (1b) with a small diameter extending in an extended manner via a step (1d). The first locking part (2) is attached to a construct (not shown), for example. (3) is the smaller diameter right half of the outer cylinder (1) (
A ball nut (4) is attached to the left end of the inner cylinder, and a second locking part connected to a vibration damping object (not shown) such as piping is attached to the right end of the inner cylinder. (5
) is attached. (6) is pole nut (4)
This is a detent pin attached to the top wall of the outer cylinder (
The inner cylinder (3) is fitted into an elongated hole (7) formed longitudinally in the earthen wall of the right half (lb) of 1) so as to be movable left and right, and these prevent the inner cylinder (3) from rotating. The damper as a whole can be expanded and contracted by moving the inner cylinder (3) in and out. (8) is an annular guide protrusion provided on the inner surface of the right end of the right half (1b) of the outer cylinder (1), and this
) and engages with the ball nut (4) to prevent the inner cylinder (3) from escaping. (9
) is a rotating rod disposed over almost the entire length inside the outer cylinder (1), and its left end is connected to the left side wall of the large-diameter left half (1a) of the outer cylinder (1) via a ball bearing (IQ). (lc)
is rotatably attached to. CIII is a rotating rod (
9), which is screwed together with the pole nut (4) in the small-diameter right half (1b) of the outer cylinder (1). α2 is a braking wheel that is fitted over the rotating rod (9) in the large diameter left half (1a) of the outer cylinder (1) and is movable in the axial direction. It is composed of a cylindrical body (12a) having a plurality of keyways αJ and a flange (121) provided at the right end of the cylindrical body (12a), and has a rotary rod (9). ) The keyway 03 of the cylindrical main body (12a) is fitted into a plurality of keys Q41 attached to the main body (12a). a9 is an inertial body fitted on the rotating rod (9) on the right side of the brake wheel (1z) so as to be rotatable via an anti-friction member αG and prevented from moving in the axial direction by a pair of stoppers α and αη; An annular spring bearing member that is fitted over the left end portion of the rotating rod (9) and fixed by a retaining ring uI; (12b) and the spring receiving member αS, which always biases the brake wheel Q2 toward the inertial body α9.
The stopper αηαη of the rotating rod (9
) is fixed in place. ① are four parts with rectangular cross sections and inverted 〆a shapes, which are provided in plural sets to face the flange portion (12b) of the brake wheel α2 and the opposing surface of the inertial body 09, and these recesses ①(c) A steel ball (to), which is a rolling element, is fitted into each. (c) is the left half (1
A) is a brake wheel receiver provided in an inwardly projecting manner.

The above-mentioned vibration damper has an inner cylinder (3
) moves left and right loosely, so the pole nut (4) of this
The rotary rod (9) having a ball screw portion α1 screwed into the rotary rod (9) is loosely rotated, and therefore the braking wheel α2 integral with the rotary rod (9) is also rotated. The inertial body O5 tries to remain stationary due to its inertia, but due to the action of the steel ball (c) fitted in the fourth part -□□□, the inertial body (151) moves together with a slight delay with respect to the brake wheel 02. It is rotated slowly, and the vibration damping mold itself can expand and contract gently to absorb the displacement of the object to be damped.

For example, when the object to be damped is rapidly moved due to an earthquake or the like, the inner cylinder (3) is also rapidly moved. As shown in Figure 3, this inner cylinder (3) is now connected to the outer cylinder (1).
) so that it is pushed into the right half (1!+) of the small diameter.
Therefore, if it moves rapidly to the left, the rotating rod (9) screwed thereon and the braking wheel α integrated therewith.
In contrast, the inertial body αS uses its inertia to cause the #1 ball U to roll inside these recesses (■), so the brake wheel O3 is pushed by these steel balls (to). moves to the left against the elastic force ζ of the fill spring ■, and the brake wheel α
Gap between the flange (12b) of No. 2 and the brake wheel holder (c)■
is removed, and the flange (12b) is pressed into the receiving part. The friction between the two prevents the rotation of the brake wheel α2, and accordingly the rotation of the rotating rod (9), which prevents the movement of the inner cylinder (3) and connects it thereto. The object to be damped, such as piping, is locked. Note that since these series of actions are performed instantaneously, almost no displacement of the object to be damped occurs.

Here, if the external load due to vibration etc. continues, after the inertia body Q51 is rotatably attached to the rotating rod (9), after the inertia body Q51 is rotatably attached to the rotary rod (9). The locked state is loosened by rotating. Therefore, if the object to be damped, such as piping, is locked with a defect inside, the distortion will be eliminated by releasing this locked state, thereby ensuring the protection of piping, etc. be able to.

When the sudden load is removed, the elastic force of the coil spring (A) moves the braking wheel α2 to the right and the steel ball (
2), the inertial body 09 is slightly rotated, the displacement of the four parts @ is eliminated, and the brake wheel (flange part (12b) of
The space @■ between and the brake wheel receiver (c) is returned to its original state, and the locked state is completely released.

In addition, when the inner cylinder (3) is pulled outward from the small diameter right half (1b) of the outer cylinder (1) due to repetitive vibrations such as earthquakes, in other words, when it rapidly moves to the right side, ,
The object to be damped is similarly locked by simply rotating the rotary rod (9) in the opposite direction to that in the above case.

In addition, in the above embodiment, the flange (12
b) is pressed into contact with the brake wheel receiver (c) approximately in the center of the left half (la) of the outer cylinder (1) and locked;
By changing the shape of the brake wheel az, this can be changed to an outer cylinder (
It is also possible to make pressure contact with the left side wall (10) of 1). Furthermore, if the arrangement of the brake wheel Q2 and the inertial body O9 is reversed to that in the above embodiment, the brake wheel O2 can be moved to the step part (1d) of the outer cylinder (1).
) can also be pressed against.

Also, although steel balls @ are interposed between the brake wheel QZ and the inertial body αS, other rolling elements such as short cylindrical or truncated conical rollers may also be interposed between them. . In that case, four parts having a V-shaped cross section that are long in the radial direction may be provided at predetermined locations on the opposing surface of the brake wheel (12) and the inertial body Q51 to accommodate the rollers.

・Furthermore, the housing (c) for accommodating rolling elements such as these steel balls (goods) and rollers may be provided on at least one of the facing surfaces of the braking wheel a2 and the inertial body 051.

Roughly speaking, the left half (1a) of the outer cylinder (1) has a larger diameter, and the right half (1a) has a larger diameter.
1b) has a small diameter, for example, the outer cylinder (1) may be made to have the same diameter over its entire length.

A vibration damper is installed between a structure such as a building and an attached object to damp vibration such as piping.
The locking portion (2) and the second locking portion (5) may be coupled to either side.

As described above, the vibration damper according to the present invention has the first locking portion (
2), which is fitted into the right half (1b) of the outer cylinder (1) so as to be freely removable and non-rotatable; The inner cylinder (3) is equipped with a female threaded part (4) at the top and a second locking part (5) at the right end, and the outer cylinder (1) is rotatably attached to the left side wall (1G) of the outer cylinder fi+. ) includes a rotary rod (9) with a male threaded portion (111) disposed over the entire length y and screwed together with the female threaded portion (4) on the right half, and an outer cylinder (1).
) A brake wheel a2 that is fitted over the rotating rod (9) at the left half (1a) of the white base and is movable in the axial direction;
Similarly, within the left half (1a) of the outer cylinder (1), this brake wheel (12) is arranged oppositely at a predetermined interval, and is rotatably and axially mounted on the rotary rod (9). An inertial body (+51 and
A spring that presses the brake wheel Q2 against the inertial body (151 side)
The brake wheel QZ and the inertial body α5 are respectively fitted into a plurality of four parts provided on at least one of the facing surfaces of the inertial body α5, and are interposed between the brake wheels α and the inertial body (151). A plurality of rolling elements (up to) and an inertial body (+5
and a brake wheel receiver provided on the left half (1&) of the guard outer cylinder (1) so as to face the brake wheel a3 with a predetermined gap on the opposite side of the brake wheel a3. Because of this, it can be locked extremely quickly and completely when vibration and shock loads are applied, protecting piping and other objects to be damped.Moreover, if these loads continue, It is possible to loosen the locked state and eliminate the buildup inside the piping, etc., thereby ensuring the protection of the object to be damped.In addition, since it is a mechanical type, it is easy to install. It has the advantage that it requires almost no maintenance and can withstand long-term use.

, l14. BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the invention, and FIG. 1 is a longitudinal sectional view showing the normal state before locking. FIG. 2 is a sectional view taken along line nn in FIG. 1, and FIG. 3 is a longitudinal sectional view, showing the locked state.

FIG. 4 is a sectional view taken along the line IV--IV in FIG. 3.

(1)...outer cylinder, (1a)・0・left half, (11))
@ee Right half, (10)... Left side wall, (2)... First locking part, (3)... Inner cylinder, (41... Ball nut (female threaded part), (5 )...Second locking part, +91
@@・Rotating rod, α]...Pole threaded part (male threaded part),
0ri...braking wheel, (151...inertia body, OQ...
Anti-friction member, wire...coil spring, I22c! 31...
Recess, (To) Steel ball (rolling element), (C) Brake wheel receiver, ■ Gap.

that's all Patent applicant: Yamashita Seisakusho Co., Ltd. 4 people outside

Claims (1)

[Claims] Outer I with a left side wall (10) with a first locking part (2)
'# (υ and the right half ib of this outer cylinder (1)) in such a way that it can be freely taken in and taken out and not rotated. Locking part (
5) and the left side wall (1c) of the outer cylinder (1).
) is rotatably attached to the outer cylinder (1)! A rotary rod (9) that is disposed over the entire length and has a male threaded portion at+ screwed to the female threaded portion (4) in the right half, and a rotary rod in the left half (t a) of the outer cylinder (1). (9
) and is movable in the axial direction. ! , is also disposed in the left half (1a) of the outer cylinder (1) to face the brake wheel α at a predetermined distance, and is rotatably mounted on the rotation rod (9) and has a shaft. An inertial body fitted to prevent movement in the direction (
151 and the inertial body (151 side) and the spring (2) that presses the brake wheel 02 against the inertial body (151 side) and the plurality of recesses (2) and (c) provided in at least one of the facing surfaces of the brake wheel a2 and the inertial body QS, respectively. These brake wheels az and inertia body (1
A plurality of rolling elements @ interposed between Half (t
A vibration damper constituted by a) and a brake wheel receiver (c) provided in the damper.