JPH0442589Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an improvement of a damping device using viscous fluid.

[Conventional technology]

BACKGROUND ART Conventionally, as a damping device utilizing the resistance force of a viscous fluid, a structure shown in FIG. 4, for example, is known (see Japanese Utility Model Publication No. 1988-19220).

This device combines an inner cylinder 2 and an outer cylinder 4 so that a certain amount of space exists in all directions.
This cavity is filled with a viscous fluid 5 such as highly viscous silicone oil, the inner cylinder 2 is fixed to a vibration-isolated member such as a structure, and the outer cylinder 4 is fixed to a stationary member such as a frame. , inner cylinder 2 when the vibration-isolated member vibrates.
vibration in the x, y, and z directions, or x,
Even during rotational motion around the y and z axes, three-dimensional kinetic energy can be absorbed without causing the inner cylinder 2 to collide with the outer cylinder 4.

[Problem that the invention attempts to solve]

Conventional damping devices have a structure in which the inner cylinder is inserted with a certain gap between the inner peripheral surface and the bottom of the outer cylinder filled with silicone oil, etc., as described above. Although the specified amount of displacement can be obtained, the damping force in the vertical direction is inversely proportional to the cube of the clearance between the inner cylinder and the outer cylinder, so try to reduce this clearance to obtain the necessary damping force in the vertical direction. Then,
The amount of horizontal displacement of the inner cylinder is limited, and if you try to secure the amount of horizontal displacement of the inner cylinder, the damping force in the vertical direction is limited and the desired damping performance cannot be obtained. In order to secure the necessary damping force in the vertical direction without being limited by the amount of horizontal displacement of the inner cylinder, the length of the immersion of the inner cylinder in silicone oil must be increased, so the entire device must be long. Therefore, there is a problem that the device becomes undesirable in terms of practicality.

This idea eliminates the above-mentioned drawbacks and can ensure the desired damping force in the vertical direction without being constrained by the amount of horizontal displacement.Furthermore, in the horizontal direction, it is possible to secure the desired damping force without being constrained by the amount of vertical or horizontal displacement. It is an object of the present invention to provide a damping device that can secure a desired damping force without causing any damage.

[Means for solving problems]

The damping device of this invention has a container that is open only at the top end and has horizontal top and bottom surfaces facing each other in the vertical direction on its inner surface, and a container that has horizontal top and bottom surfaces, with at least the top end being open. The movable member is provided with a hollow part provided vertically in the vertical direction, and a rod, and the movable member is moved horizontally with a constant gap maintained between the opposing upper and lower surfaces inside the container through guide members. The rod is inserted into the hollow part of the movable member through the opening of the container so as to be movable in the vertical direction while maintaining a certain gap through the guide member, and the viscous fluid is inserted between the container and the hollow part of the movable member. It accommodates.

The container is fixed to the installation surface of the equipment to be damped or to the installation surface of the equipment to be damped, and the rod is fixed to the installation surface of the equipment to be damped or the equipment to be damped so that the movement is restrained according to the relative displacement between the equipment to be damped and the installation surface. It is installed.

[Effect]

In the damping device of this invention, when the device or the device installation surface vibrates in the vertical direction, the rod and the movable member built into the container move vertically relative to each other, and the rod and the hollow part of the movable member move. A damping force due to the interlayer viscous resistance of the viscous fluid in the gap between the two acts in the vertical direction.

When the equipment or equipment installation surface vibrates horizontally, either the moving member moves horizontally relative to the container via the rod, or the container moves horizontally relative to the moving member, causing the moving member to move horizontally. A damping force due to interlayer viscous resistance of the viscous fluid in the gap between the lower surface and the inner surface of the container acts in the horizontal direction.

〔Example〕

Examples of this invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional side view showing an embodiment of the damping device 10 of this invention. In the figure, reference numeral 12
2 shows a container fixed to the equipment installation surface 42, 20 a moving member, and 30 a rod fixed to the equipment 44.

The container 12 consists of a cylindrical top part 13 and a bottom part 14 having a larger diameter than the top part 13. The upper end surface of the top part 13 is an open end, and the inner surface of the bottom wall of the bottom part 14 and the opposite wall thereof are each horizontally shaped. A lower surface 15 and an upper surface 16 are formed to face each other in the vertical direction.

The moving member 20 is provided with a cylindrical portion 22 protruding vertically in the vertical direction at the center of a circular flat base portion 21 having horizontal upper and lower surfaces, and the cylindrical portion 22 includes:
A hollow portion 23 having a cylindrical inner peripheral surface is formed to penetrate from the upper end surface to the bottom surface of the base portion 21 . The movable member 20 has a base 21 located between the lower surface 15 and the upper surface 16 of the container bottom 14, respectively.
5, 26, and the guide member 2
It is possible to move in the horizontal direction while maintaining a certain vertical gap 27, 28 regulated by the sizes of 5, 26. As the guide members 25 and 26, it is preferable to use members suitable for rolling, such as steel balls, but a guide surface that can maintain a gap between the container bottom 14 and the moving member 20 may be formed on either one of them. Various methods can be used, such as:

The rod 30 is a cylindrical body with a flat plate portion provided at an upper end portion 31 fixed to a device 44 with bolts 32, and inserted into the hollow portion 23 of the cylindrical portion 22 of the movable member 20 via a guide member 33. The guide member 33 is inserted so that it can move up and down (vertically) while maintaining a constant radial gap 34 regulated by the size of the guide member 33. This guide member 33
Although various means can be used as described above, it is preferable to use steel balls suitable for rolling.

Note that the horizontal distance between the cylindrical portion 22 of the moving member 20 and the top 13 of the container 12 and the horizontal distance between the base 21 of the moving member 20 and the bottom 14 of the container 10 are determined by the moving member 20 or The dimensions of each part are set to be larger than the permissible amount of movement of the container 12 in the horizontal direction, and the vertical distance from the lower end surface of the rod 30 to the lower surface 15 of the container 12 is shape part 2
The length dimension of the rod 30 is set to be larger than the permissible vertical movement amount of 2.

The container 12 and the hollow part 23 of the cylindrical part 22 of the moving member 20 contain a viscous fluid 40 such as silicone oil, silicone putty, or a mixture of fluid and powder.

As shown in FIG.
An appropriate number of elastic supports 50 are arranged to support the space between the base and the stationary equipment installation surface 42 such as a foundation. The elastic support body 50 is not limited to the illustrated coil spring, but vibration-proof rubber, air springs, etc. may also be used.

Now, when the equipment 44 to be damped vibrates in the vertical direction, the rod 30 fixed to the equipment 44 moves in the vertical direction with respect to the cylindrical part 22 of the movable member 20, so that the rod 30 and the cylindrical part 22 hollow part 2
3, a resistance force of the viscous fluid 40 proportional to the moving speed of the rod 30 is generated, and this resistance force acts as a damping force against the vertical movement (vertical displacement) of the rod 30.

The strength of the damping force against the vertical displacement of the rod 30 is as follows, if the diameter of the rod 30 and the length of insertion into the cylindrical portion 22 (length of immersion in the viscous fluid) are constant:
The viscosity of the viscous fluid 40 used and the size of the gap 34 between the rod 30 and the hollow part 23 of the cylindrical part 22 can be arbitrarily changed.

Furthermore, when the equipment to be damped 44 vibrates in the horizontal direction, the movable member 20 moves horizontally with respect to the container 12 via the rod 30. In the gaps 27 and 28 with the upper surface 16, a resistance force of the viscous fluid 40 proportional to the moving speed of the moving member 20 is generated, and this resistance force acts as a damping force against the horizontal movement (horizontal displacement) of the moving member 20 and eventually the rod 30. Use as.

The strength of the damping force against horizontal displacement of the rod 30 is determined by the thickness and diameter of the base 21 of the moving member 20;
When the insertion length into the container bottom 14 (immersion length in the viscous fluid) is constant, the viscous fluid 40 to be used
, the base 21 of the moving member 20 and the container bottom 14
Gap 27, 2 between lower surface 15 and upper surface 16 of
It can be arbitrarily changed by appropriately selecting the size of 8.

In addition, if rotational vibration with the horizontal direction as the rotational axis occurs in the equipment 44 to be damped, a rotatable device such as a universal joint or an elastic joint should be installed at the connection between the rod 30 and its upper end 31. It can be connected via a joint.

Note that even when the above-described damping device 10 is used for vibration isolation of precision measuring instruments, etc., the same effects as in the case of vibration isolation can be obtained.

FIG. 2 is a longitudinal sectional side view showing another embodiment of this invention.

In this embodiment, a mounting member 35 is fixed to the device 44 side with bolts 36, and the upper end (large diameter part) 31 of the rod 30 is accommodated in the mounting member 35, and is moved with the lower end surface of the rod 30. Base 2 of member 20
A coil spring 37 is inserted between the bottom surface of the hollow part 23 of the cylindrical part 22 provided in the cylindrical part 1 and supports the rod 30. The coil spring 37 is connected to the hollow part 2 of the cylindrical part 22.
It may be fixed to the inner circumferential surface of No. 3.

Note that the method of supporting the rod 30 with respect to the moving member 20 is not limited to the above-mentioned method, and instead of the coil spring 37, an elastic body such as rubber may be used.

Appropriate gaps 3 are provided between the rod 30 and the inner peripheral surface of the bottom wall of the mounting member 35, and between the upper end 31 of the rod 30 and the inner peripheral surface of the side wall of the mounting member 35.
8a, 38b are provided, and the amount of relative movement between the moving member 20 and the container 12 due to horizontal vibration of the device 44 or the device installation surface 42 is determined by the gaps 38a, 38b.
Horizontal damping force is prevented from acting within the range of .

Moreover, between the upper end 31 of the rod 30 and the bottom surface of the device 44 and the inner surface of the bottom wall of the mounting member 35,
Appropriate gaps 39a and 39b are provided, respectively, so that the amount of relative movement between the rod 30 and the cylindrical portion 22 due to vertical vibration of the device 44 or the device installation surface 42 is attenuated in the vertical direction within the range of the gaps 39a and 39b. I try not to apply force.

Since the configuration other than the above is the same as that of the embodiment shown in FIG. 1, the main parts are given the same reference numerals and detailed explanations will be omitted.

The damping device 10 of this embodiment is also installed between the device 44 supported by the elastic support 50 and the device installation surface 42, as explained in FIG.
The amount of relative movement between the moving member 20 and the container 12 when the device 44 or the device installation surface 42 vibrates in the horizontal direction, and the rod 30 and the cylindrical portion when the device 44 or the device installation surface 42 vibrates in the vertical direction 22 exceeds the size of the gaps 38a, 38b provided between the rod 30 and the mounting member 35, and the gaps 39a, 39b. The vibration isolation and vibration isolation performance of the elastic support body 50 in the dead zone at the time of minute displacement is improved, and the damping device 10 can be operated only at the time of large displacement.

The target equipment for installing the damping device of this invention covers a wide range of fields such as nuclear reactor buildings, transformers, shakers, and electronic equipment, but the target equipment installation surfaces are generally foundation surfaces on the ground, buildings There are various cases such as indoor floors, steel structures, etc.

In each of the above embodiments, the hollow portion of the cylindrical portion of the movable member is a cylindrical surface, and the rod inserted into the cylindrical portion is a cylindrical body. The cross-sectional shapes of the rods and the rods are not limited to those of the embodiments described above, and may be formed into polygons or other arbitrary shapes.

In addition, although the container of each of the above-mentioned examples has a shape in which a top with a smaller diameter than this protrudes from the bottom, it is also possible to omit the top and use a cylindrical or polygonal box having an opening in the upper wall. It is also possible to form a horizontal top surface and a horizontal bottom surface on the inner surfaces of the top wall and the bottom wall, respectively.

In addition, in each of the above embodiments, the movable member has a shape in which a cylindrical portion with a smaller diameter than this protrudes from the base, but the base is omitted and a hollow portion with at least an upper end is opened in the vertical direction. It may be formed into a cylindrical body, and horizontal surfaces may be formed on the upper and lower surfaces of the cylindrical body, and the height and outer diameter thereof can be set to arbitrary dimensions.

These containers and moving members may have various shapes and may be used in any combination.

Furthermore, in the above embodiment, a case was explained in which a container with a moving member incorporated therein was fixed to the equipment installation surface and a rod was attached to the equipment. It may be configured to be attached to a surface, and even with this configuration, the same effects as in the embodiment described above can be obtained.

[Effect of idea]

As explained above, the damping device of this invention is
A movable member having a vertical hollow part is installed in the equipment installation surface or a container fixed to the equipment so that it can be moved horizontally through a guide member while maintaining a certain vertical gap, and the equipment or equipment installation surface is installed. The rod attached to the rod is inserted into the hollow part of the movable member through the guide member so as to be movable in the vertical direction while maintaining a certain horizontal gap, and the viscous fluid is contained in the container and the hollow part of the movable member. Because of this, vertical vibrations of the equipment or equipment installation surface are affected by damping force due to the resistance of viscous fluid in the gap maintained constant by the guide member between the rod and the hollow part of the moving member. However, against horizontal vibrations of the equipment or the equipment installation surface, a damping force is applied due to the resistance of the viscous fluid in the gap maintained constant by the guide member between the moving member and the container, and vibrations in the vertical and horizontal directions are Necessary and sufficient damping effects can be obtained in three dimensions.

Furthermore, according to this invention, the rod moves vertically within the hollow part of the movable member that moves horizontally relative to the container, so the amount of horizontal movement of the movable member The damping force in the vertical direction can be set to a desired strength by appropriately selecting the size of the gap between the rod and the hollow part of the moving member and the viscosity of the viscous fluid, regardless of the In order to balance the conflicting conditions of horizontal movement amount and vertical damping force, there is no need to increase the insertion length of the rod into the hollow part of the moving member, and this device has practical value that eliminates all the drawbacks of conventional devices. A high damping device is obtained.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view showing an embodiment of this invention;
FIG. 2 is a longitudinal side view showing another embodiment of this invention, FIG. 3 is a side view showing an example of use of the damping device of this invention, and FIG. 4 is a longitudinal side view showing a conventional damping device. In the figure, 10 is a damping device, 12 is a container, 15, 1
6 are the lower and upper surfaces of the container, 20 is a moving member, 23 is a hollow part of the moving member, 27 and 28 are gaps between the moving member and the lower and upper surfaces of the container, respectively;
30 is a rod, 34 is a gap between the rod and the hollow part of the moving member, 40 is a viscous fluid, 42 is a device installation surface, and 44 is a device to be damped.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A container is fixed to the installation surface of the equipment to be attenuated or to the equipment to be attenuated, the inner surface of which is formed with a horizontal upper surface and lower surface facing each other in the vertical direction, and only the upper end is open; A movable member, which has a horizontal upper surface and a lower surface and is provided with a hollow part opening at least at the upper end in the vertical direction, is moved horizontally by keeping a constant gap between the upper surface and the lower surface inside the container via guide members. A rod that is installed so as to be movable in the direction and whose movement is restrained according to the relative displacement between the equipment to be damped and the installation surface of the equipment to be damped is inserted into the inner surface of the hollow part of the movable member through the opening of the container. 1. A damping device, characterized in that the damping device is inserted so as to be movable in the vertical direction with a constant gap maintained between the containers via a guide member, and a viscous fluid is accommodated in the interior of the container and the hollow portion of the moving member. (2) The upper end of the rod is installed with an appropriate gap in the horizontal and vertical directions via a mounting member fixed to the equipment to be damped or to the installation surface of the equipment to be damped, and the rod is attached to the moving member with a spring spring. Alternatively, the damping device according to claim 1, which is a registered utility model, is supported via an elastic body such as rubber.