JPH02176228A - Vibration suppressor of corrugated plate spring type - Google Patents

Abstract

PURPOSE:Not to restrict slow displacements and suppress sudden vibrations by constituting with a case provided with a ball nut and inserted into a main case and to be freely inserted or drawn out but not to be allowed to rotate, a screw rod to engage with the ball nut, links, a corrugated plate spring, a shoe, etc. CONSTITUTION:When a piping produces a slow displacement according to the expansion or contraction due to temperature changes, relative movement between a main case 1 and a subcase 2 forces a screw rod 3 as well as a main link 4 to rotate. A square shape formed with pins 9-12 supported with a coil spring, however, does not change its form because the relative movement is slow. Therefore, a shoe 5 does not core in contact with a corrugated plate spring 13 and is freely rotatable. In the case the piping produces sudden and violent vibration due to earthquake or the like, the main link 4 tends to make rapid reciprocal movement. The shoe 5, however, presses the coil spring 7 with inertia, causes the square shape 9-12 in a diamond shape, and the end of shoe presses the corrugated plate spring 13. Because the corrugated plate spring is installed with expanding tendency, the rotation is restricted and the vibration of the piping is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration damper used in piping systems of thermal power plants, chemical plants, etc. It does not restrain slow displacement due to temperature changes, etc., and is capable of resisting sudden vibrations caused by earthquakes or ponds. is designed to dampen this vibration, and everything is configured mechanically,
It has a relatively simple structure and is maintenance free.

Examples will be described with reference to the drawings. Cylindrical main case 1
is composed of a large diameter portion 1a and a small diameter portion 1b, and has a handle IC at the end of the large diameter portion, and is open at the end of the small diameter portion. The cylindrical sub case 2 is inserted into and out of the small diameter portion 1b of the main case,
A ball nut 2a is attached near the inner end, and a puller 2 is attached to the outer end.
Contains b. The sub case 2 is rotated in the correct direction relative to the main case 1 by the handle 2b, but if it is necessary to prevent one rotation more reliably, a key and a keyway (not shown in the figure) should be installed at the contact area between the sub case and the small diameter part of the main case. ) will be established. Threaded rod 3 is threaded part 3
a and an extension part 3b, and the inner end of the extension part is rotatably supported by the main case 1, but cannot be moved in or out. l
It protrudes into the inside of a. A shoe device consisting of a main link 4, a shoe 5, a sub link 6, and a coil spring 7 is attached to the extension 3b. The main link 4 is fixed in the central part to the threaded rod extension 3b. A pair of shoes 5 are each centrally pivoted to opposite ends of the main link 4 by an axle 8.8. 1
The pair of sub-links 6゜6 have both ends attached to the pins 9.10.11.
．． 12, respectively, and are pivotally connected to both ends of the shoe 5.5.

The rectangle formed by the bins 9, 10, 1.1.12 is therefore capable of parallelogram movement about the threaded rod 3. A bottle 9 is provided on the outer periphery of the sub link 6. Coil springs 7 are inserted between lO and bottles 11 and 12, respectively. Therefore bin 9.10.
11.12 always form a right quadrilateral. A corrugated leaf spring 13 is inserted into the inner surface of the large diameter portion of the main case corresponding to the shoe 5 so as to extend freely. Also, when the four bins form a right-angled quadrilateral as described above, the end of the shoe 5 and the wavy spring 13
Make sure there is an appropriate gap between them.

The present invention is configured as described above. This damper is used by locking one handle to a fixed object such as a structure and connecting the other handle to the piping system. When the piping causes slow displacement due to expansion and contraction due to temperature changes, the threaded rod is forced to rotate due to the relative movement in and out of the main case 1 and the sub case 2, and the main link 4 also rotates, but since the operation is slow, The above-mentioned right-angled quadrangle supported by the coil spring 7 does not deform, so the shoe does not come into contact with the corrugated spring 13, and there is no problem with rotation. If this occurs, the main link 4β attempts to perform rapid reciprocating rotation, but at this time, the shoe 5 presses the coil spring 7 due to its inertia, deforming the squares 9, 10, 11, and 12 into diamond shapes, and causing each shoe to One end presses the corrugated leaf spring 13. At this time, the shoe is accompanied by a component force that tries to rotate the corrugated leaf spring in the circumferential direction, but as mentioned above, the corrugated leaf spring is inserted with tension, so the force that tries to rotate it is , is greatly damped by the frictional resistance that spreads around the entire circumference of the corrugated leaf spring. If the threaded rod rotates in the opposite direction, the diamond shape will be tilted in the opposite direction and will act in the same way. The piping is damped by repeating the above actions. Furthermore, when continuous motion in the same direction by a water hammer or the like is applied, the corrugated leaf spring slips and is buffered by the frictional force.

3 and 4 show other embodiments. That is, the coil spring 7 is replaced with a torsion spring 14 to further smooth the movement of the shoe. Shoe 5.5 is also replaced with shoe 15.16. The shoes 1516 equalize the weight and moment around the bottle 8, but the shapes of the shoes 15 and 15 are changed so that only both ends of the shoe 15 can engage with the corrugated spring 13 and the shoe 16 does not. ing. In the case of shoes 5.5, the symmetrical corners of both corners are wedged into the recesses of the corrugated leaf spring, and excessive friction may make it difficult for the shoes 5, 5 to return.
This was avoided.

Figures 5 and 6 also show examples of ponds. In order for the shoe device to perform the above-mentioned movement properly, it is necessary to give the shoe 5 an appropriate weight. For this reason, we would like to make the shoe 5 larger, but this is an example of what to do when this is not possible due to the space available.
d, on which a weight ring 17 of a required weight is rotatably supported, and a bottle 17a implanted in the weight ring 17 is engaged with an oval hole bored in the sub link 6. In this case, it is obvious that the addition of the weight wheel 17 has the same effect as increasing the weight of the shoe 5. However, the sub link 6 must have a special shape with an elliptical hole.

As described above, the present invention is entirely mechanically constructed and does not use combustible materials or components that deteriorate over time, so it can be used in locations that require maintenance-free operation, such as nuclear power plants. .

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a front view of the present invention, FIG. 2 is a sectional view taken along the line AA, FIG. 3 is a cutaway side view of another embodiment, and FIG. 4 is a perspective view of a torsion spring. FIG. 5 is a partial front view of an embodiment of the weight ring, and FIG. 6 is a side view of the vicinity of the weight ring. l--main case, 1a--large diameter part, ib--small diameter part, IC--handle, 1d--circular projection, 2--sub case, 2a-- ball nut, 2b...Holder, 3
-...B screw rod, 3a...Threaded part, 3b...Extension part,
4... Main link, 5... Shoe, 6... Sub link, 7... Coil spring, 8... Shaft, 9, 10, 11.
12... Bin, 13... Corrugated plate spring, 14... Torsion spring, 15.16... Shoe, 17... Weight ring, 17a... Pin. Patent applicant: Sanwa Tekki Co., Ltd. Figure 3 Figure 4

Claims (1)

[Claims] A cylindrical main case consisting of a large diameter part and a small diameter part, with a handle at the end of the large diameter part and an open end at the other end.The main case can be inserted into and taken out of the small diameter part.It is inserted in a non-rotatable manner, has a ball nut near the inner end, and has a handle at the outer end. The cylindrical sub-case is equipped with a handle, and consists of a threaded part and an extension part.The inner end of the extension part is rotatably supported on the main case so that it cannot be moved in or out.The threaded part is screwed into the ball nut, and the extension part is attached to the main case. A threaded rod protruding into the large diameter section, a corrugated leaf spring inserted freely into the inner surface of the large diameter section of the main case, a main link whose central part is fixed to the threaded rod extension, and a central part connected to both ends of the main link. a pair of shoes pivotally connected and positioned corresponding to the corrugated leaf spring;
A shoe device consisting of a pair of sub-links pivotally connected to the ends of both shoes in parallel with the main link, and a spring inserted between the shoes so as to maintain the shoes and each link at right angles at all times; A corrugated plate spring type vibration suppressor consisting of.