JPS6073144A - Enclosed-type hydraulic vibration damper - Google Patents

Abstract

PURPOSE:To obtain a hydraulic vibration damper which restrains sudden vibration only but not leisured displacement of a pipe and frees of any oil leak by filling the spaces, defined by two bellows, with all oil as it is impenetrable through the bellows. CONSTITUTION:An internal cylinder 5 has both an inner lid 7 at one end thereof and an outer lid 6 at the other. The internal cylinder 5 is slidable between an external cylinder 1 and a small-diameter lid 4 and has a plurality of longitudinal grooves 5a therein as they are keyed with pins 3. A communication passage 8 which can communicate both left and right chambers with each other is made through the inner lid 7 and has valve devices 9 and 10 at both ends thereof. The opposed faces of a large-diameter lid 2 and the inner lid 7 are connected by a method bellows 13 and the defined space is airtight. The inner lid 7 and the small-diameter lid 6 are also connected by bellows 14. Consequently, leisured movement of the internal cylinder 5 inside the external cylinder 1 will not restrained while an inpulsive movement by restricted. Besides, any oil will not leak due to the tightness to liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a 40-pressure vibration damper installed in pipes, etc., which does not restrict slow displacement of pipes due to temperature changes, etc.
T! It is characterized by restricting only rapid vibrations caused by ItSu, etc., and by sealing the hydraulic oil in a container to eliminate leakage and evaporation.

Examples will be described with reference to the drawings. A large-diameter lid 2 is fixed to one end of the outer cylinder 1, and a handle 2a is provided to this lid. Further, at the other end, a small diameter lid 4 is attached concentrically to the large diameter lid via a plurality of radial pins 3. The inner cylinder 5 has an inner lid 7 fixed to one end, and an outer lid 6 fixed to the other end.
A handle 6a is provided to this. The inner cylinder 5 can slide between the outer cylinder and the small-diameter lid, and for this purpose, a plurality of vertical grooves 58 are provided corresponding to the pins 3. In addition, the inner lid 7 is provided with a communication passage 8 that allows communication between the left and right chambers. The communication path 8 is provided with valve devices 9 and 10 near both ends thereof, respectively.

Both have a valve 11 and a spring 12, and the valve 11 has a central pore 11a and a side hole 11b. Large diameter lid 2
A metal bellows 13 is used to provide close reading between the facing surfaces of the inner lid 7 and the inner lid 7, and the interior is kept liquid-tight. Similarly, the inner lid 7 and the /I'V diameter lid 6 are connected by a bellows 14. All bellows are commercially available products. Fill both bellows with oil.

The present invention is constructed as described above, and is used by connecting one of the pulls 2a and 6a to a structure and the other to a pipe.

Even if a slow relative movement occurs between the outer cylinder and the inner cylinder due to the displacement of the piping due to temperature changes, the curve of both chambers of the inner lid will not change due to the side hole 11 of the valve.
b can be freely distributed, and there are no restrictions on its relative entry and exit. Next, let us consider a case in which the piston attempts to make an impulsive movement to the right in FIG. 2 due to vibrations caused by affA or the like. The curve of the white oil chamber presses the valve 11 to the left against the force of the spring 12. As a result, the tip of the valve 11 reads the end of the communication path 8, so the side hole 11 bi is opened. j, the oil is forced to flow out only from the central pore 11a,
extremely narrowed down. The resistance restrains the impulsive movement of the piston. The operation of the valve device 10 when the screw 1 moves to the left is also controlled by its repetition. The valve device is not specified in the above structure. It is advisable to select an appropriate one from known ones.

A conventionally known hydraulic isolator generates relative motion between a piston rod passing through a cylinder lid and a cylinder, and damps vibration by the resistance of oil applied to the piston. With this structure, even a small amount of oil leaks from the gap between the lid and the piston rod, and a separate means of replenishing oil had to be considered. On the other hand, in the present invention, all the songs are stored in two bellows 13°14 in a liquid-tight manner.
I don't have to worry about this at all. Maintenance free B, 1
It is characterized by its ability to withstand υ1i and k applications.

[Brief explanation of drawings]

FIG. 1 is a front view of the present invention, and FIG. 2 is an enlarged front view showing the vicinity of the communication path. 1...Outer cylinder, 2...Large diameter lid, 3...Pin, 4...Small diameter lid, 5...Inner cylinder, 5a...
Vertical lVj, 6...outer lid, 7...inner lid, 8
...Communication path, 9゜10 ...Valve device, 11 ...
・Valve, 11a...center pore, 11b...side hole,
12...Spring, 13.14...Bellows. Patent applicant Sanwa Chikki Co., Ltd.

Claims (1)

[Claims] The outer surface has a large-diameter lid with a handle on one end and a small-diameter lid fixed concentrically through a radial pin on the other end, an inner lid on one end, and an outer lid with a handle on the other end. An inner surface that is slidable between the lids and has a vertical groove that corresponds to the pin, a communication passage that allows communication between the left and right compartments through the cylindrical inner lid and has a valve device at both ends, and a large diameter lid and an inner surface. It consists of a 1" metal bellow that connects each opposing surface of the lid and the inner lid with a liquid-tight 1iJ capacity, and fills the inside of both bellows with 〆ill, and then closes one of the handles. A closed type i'llll pressure vibration suppressor that connects external force to the vibrating body.