JPS6258414B2 - - Google Patents

Description

[Detailed Description of the Invention] In order to reduce vibrations exerted on the foundation by equipment such as pumps and generators, it is widely practiced to support the vibrating body via an elastic support device such as a spring or rubber provided on the foundation. However, this support device cannot restrain and damp the vibration when a large impact displacement occurs in the vibrating body due to an earthquake or a drastic change in the rotational speed of the vibrating body. The present invention relies on other elastic support devices to prevent the transmission of ordinary micro-vibrations, and makes it possible to suppress large impact displacements by using hydraulic oil.

Examples will be described with reference to the drawings. A bottom plate 2 is fixed to the bottom of the cylinder 1. Further, a ring lid 3 is screwed and fixed to the upper part of the inside of the cylinder, and a circular window is opened in the center of the ring lid. The rod 4 freely passes through this circular window, has an end plate 5 fixed to its lower end, and is capable of supporting a vibrating body V at its upper end. The cylinder is filled with oil having an appropriate viscosity, and the liquid level is kept above the ring lid 3. The spring receiving plate 6 is inserted into the rod 4 through a central hole so as to be movable up and down, and an appropriate gap 7 is provided between the two. A spring 8 is inserted between the spring receiving plate 6 and the bottom plate 2, and the spring receiving plate contacts the ring lid 3 to form an oil chamber 9 on its lower surface. The annular rubber sheet 10 has its outer circumference attached to the upper end of the cylinder 1, and its inner circumference attached to the flange 4a provided on the rod 4.
Has a dustproof effect. The present damper D configured as described above is used in conjunction with other elastic support devices, such as the spring device S, to support the vibrating body V as shown in FIG. , near the center of the oil chamber 9.

In response to the daily slight vibrations of the vibrating body, the rod is integrated with it and vibrates slightly, but after a small amount of oil flows out of the oil chamber 9 from the gap 7, the viscosity of the oil causes it to vibrate on the surface of the rod and end plate. Since it forms a minute space, it does not have the force to restrain minute vibrations. On the other hand, in response to sudden and large vibrations, a suppressing effect is exerted as described below regardless of whether the vibration is horizontal or vertical. First, when the rod moves horizontally, the oil displaced by the rod immediately fills the space on the opposite side, and the vibration is suppressed by the viscous resistance during this time. Next, in vertical movement, the effect is different between upward and downward movement. In the case of a downward direction, the oil flows in the direction of the arrow in FIG. 3, exhibiting viscous resistance, and at the same time, the reduction in oil chamber volume due to the entry of the rod increases the oil pressure and exhibits high resistance. However, some of the oil flows through the gap 7 to the outside of the oil chamber. Also, if it is upward,
Negative pressure is generated on the lower surface of the end plate, but this negative pressure is also affected by the increase in oil chamber capacity due to the rod coming out, and the spring receiving plate is pulled down against the spring. Therefore, the oil flows as shown by the arrow in FIG. 4, exhibiting viscous resistance, and at the same time fills with oil corresponding to the negative pressure. Since the resistance is greater in the downward direction than in the upward direction, the rod rises upward while damping each time, and the support of the vibrating body gradually changes from elastic support by the spring device S to rigid support by the main damper. . This is favorable for the vibrating body since it means converting it into a stable support. When the vibrations stop, the rod will naturally settle and return to its previous state.

Dampers that suppress vibrations using oil are well known, but unless oil is confined in an oil chamber of a certain capacity, they lose their restraining force against repeated vibrations. The present invention is characterized in that, by the valve action of a spring presser plate supported by a spring, vibration can be suppressed in all directions by easily responding to changes in the internal volume of the oil chamber due to the lifting and lowering of the rod.

[Brief explanation of the drawing]

FIG. 1 is a front view of the present invention, FIG. 2 is an explanatory diagram of the arrangement during use, and FIGS. 3 and 4 are explanatory diagrams of the same action. 1...Cylinder, 2...Bottom plate, 3...Ring lid,
4... Rod, 4a... Flange, 5... End plate,
6...Spring receiving plate, 7...Gap, 8...Spring, 9...
...Oil chamber, 10...Rubber sheet, V...Vibration body, D
...damper, S...spring device.

Claims (1)

[Claims] 1 A cylinder fixed on a horizontal bottom plate, a ring lid fixed near the top of the cylinder and having a circular window in the center, and a ring lid that passes freely in and out through the circular window, with a vibrating body supported at the upper end and an end at the lower end. A rod to which a plate is fixed, a spring receiving plate that is inserted into the outer periphery of the rod so that it can be raised and lowered with an appropriate gap and that can come into contact with the ring lid and form an oil chamber on the lower surface, and the bottom plate and the spring receiving plate of the cylinder. and a spring inserted between the end plate and another elastic support device that supports the vibrating body to maintain the height position of the end plate near the center of the oil chamber.