JPS6124574B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a snubber used for damping vibrations in pipe systems of power plants and plants. Snubbers are known that effectively dampen sudden vibrations caused by earthquakes, etc., without restraining slow displacements of pipe systems caused by temperature changes, etc., but the present invention provides snubbers that are smaller, lighter, and less expensive. The purpose is to provide

Examples will be described with reference to the drawings. Case 1
is a cylindrical body with a handle 1a on one end and a lid 1 on the other end.
b are fixed to each other. The threaded rod 2 has a ball screw cut into it, is inserted into the center hole of the lid 1b so as to be freely removable, and has a handle 2a at its outer end. The nut 3 is a cylindrical body, and part of its outer circumference is connected to the bearing 4.
It is rotatably fitted into the inner surface of the case 1. The nut 3 has a U-shaped passage 3a, both ends of which are open to the inner surface of the nut. Both open ends are connected to the ball screw of the threaded rod to form a circulation path and accommodate the ball 5. However, in the present invention, the U-shaped passage 3a
An annular groove is provided across the groove, into which an annular protrusion 6b of an inertia ring 6, which will be described below, is fitted. Note that a separate piece 3b is used for the curved corner of the U-shaped passage 3a for convenience of construction, and the figure shows the piece fitted and fixed to the nut 3. The inertia ring 6 is a cylindrical body, and is rotatably fitted onto the outer periphery of the nut 3. However, this rotation is controlled by the key 3 provided on the nut 3.
c, and a gap 6 provided in the ring 6 so as to be able to engage therewith.
a is limited to an appropriate small angle range.
The ring 6 also has an annular ridge 6b on its inner surface, which slidably engages the nut 3 as described above. The protruding edge 6b is provided with an axial notch that can overlap with the U-shaped passage 3a, allowing the ball 5 to pass through when the two overlap. There is a notch 3d in a part of the outer periphery of the nut 3, and a coil spring 8 is attached to a screw 7 inserted into the notch 3d, and both legs of the notch 3d are made to protrude outward. The inertia ring 6 also has a corresponding notch 6c, and both leg ends of the spring 8 press against this notch so that the angular phase of the inertia ring 6 with respect to the nut 3 can be maintained constant. Further, when the ring 6 is in this constant angular phase, the notch of the protruding edge 6b is adjusted so as to overlap with the U-shaped passage 3a.

The present invention is configured as described above. This snubber is used by connecting two pulls 1a and 2a, one of which is connected to a pipe system and the other to a structure. Now, when a slow displacement occurs in the pipe system and a movement of approaching or separating occurs between the two pullers, the nut 3 turns, and the ring 6 also tries to turn accordingly. In this case, since the nut 3 rotates slowly, the spring 8 rotates the ring 6 without being compressed, so that the U-shaped passage remains in communication from beginning to end, and all operations are performed without any trouble. On the other hand, when rapid vibration occurs in the pipe system, the nut 3 is caused to undergo rapid reciprocating rotation. In this case, the spring 8 is deflected by the static inertia of the inertia ring 6, creating a relative angular phase difference between the nut and the ring, making the U-shaped passage difficult for the ball to pass through. Vibration damping is achieved by this. Nut and ring are key 3c and gap 6
Since the rotation angle range is limited by a,
The spring will not be damaged by turning the ring too much.

Most of the conventional snubbers of this type use ball screws, but the ball screw is used only to smooth the rotation of the rotating body, and the damping effect is not achieved by the inertia of the attached weight or by the relationship between the ball screw and the ball screw. This depended on factors such as frictional resistance between parts. In contrast, in the present invention, the rapid vibration is damped by closing the circulation passage of the ball itself, so there is no need to attach other parts as described above. As a result, the overall size and weight can be significantly reduced. Furthermore, since it can be controlled simply by opening and closing the passage, it is effective regardless of the level of the vibration cycle.
The above are the features of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a front view of the present invention, and FIG. 2 is a cross-sectional view taken along line AB. 1...Case, 1a...Handle, 1b...Lid,
2... Threaded rod, 2a... Pull, 3... Nut, 3
a...U-shaped passage, 3b...piece, 3c...key, 3
d... Notch, 4... Bearing, 5... Ball, 6... Ring, 6a... Gap, 6b... Flange, 6c... Notch, 7... Screw, 8... Spring.

Claims (1)

[Claims] 1. A cylindrical case with a handle at one end and a lid at the other end, a ball screw rod that is inserted into the center hole of the case lid so as to be freely removable and has another handle at its outer end, and a ball screw rod that is rotatably inserted into the inner surface of the case. a cylindrical nut that is supported and has a circulation path that can communicate with the ball screw and is provided with an annular notch that cuts a part of the circulation path; It is composed of an inertia ring provided with a passage that allows the circulation path to communicate with each other in phase, and a spring that is attached between the nut and the inertia ring and can normally maintain the inertia ring in an angular phase where the circulation path communicates with the inertia ring. ,
A ball actuated snubber characterized in that an inertia ring presses a spring due to sudden rotation of a nut, rotates relative to each other, and closes a circulation path.