JPH04366081A - Gas pressure type piping supporting device - Google Patents

Abstract

PURPOSE:To reduce the sizes of a supporting device for elastically supporting a piping which is displaced by thermal change and so on by supporting the piping at the outer end of a rod extended outward through an oil chamber side of a cylinder and by connecting a balance vessel containing an elastic bag to the oil chamber. CONSTITUTION:There are provided a cylinder 1 divided by a piston 2 into an upper air chamber 3 opened to the air through a hole 1a and a lower oil chamber 4 filled with oil, and the upper end is locked by a building. A piping W is supported by the lower end of a rod 5 which slidably pierces the cylinder bottom, extends downward and is integral with the piston 2. And a balance vessel 6 which is in the airtight cylindrical shape and contains an elastic bag 7 filled with high pressure gas is provided, and high pressure gas can be fed into the elastic bag 7 from a pipe 8 through a gas valve V1. And this balance vessel 6 is made to communicate to the oil chamber 4 through a pipe 9 provided with a main valve V2 and a pressure meter G. By this, the piping W can be supported elastically or with a constant load.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe support device that elastically or under a constant load supports pipes that are displaced due to thermal changes or other causes.

0002

2. Description of the Related Art Spring hangers and constant hangers are known for supporting piping that is displaced due to heat or other causes. Both provide elastic support for the pipe, the latter also being capable of supporting constant loads. Both are made of steel and have steel springs installed. However, those used in nuclear power plants and large chemical factories are large and heavy. The springs are also huge, several times larger than those normally used in vehicles. Due to its extra large size,
Their manufacture must be done manually by skilled workers, and this is a major cause of hindering production.

0003

[Means for solving the problem] A gas spring is used instead of a metal spring. For this purpose, an elastic bag filled with high-pressure gas is housed in a steel cylinder, and oil pressurized by increased piping load is communicated with the cylinder to pressurize the bag.

Since the pressure and volume of gas are almost inversely proportional,
Due to the displacement of the piping, the pressure in the bag also increases or decreases. Therefore, if the bag body is made smaller and the amount of oil supplied and discharged is relatively increased, a relatively large change in load will result. On the other hand, if the bag is made larger and the amount of oil supplied and discharged is made relatively smaller, the gas pressure can be kept approximately constant and the range of load changes becomes smaller. The former approximates the characteristics of a known spring hanger, and the latter approximates the characteristics of a known constant hanger.

The range of load changes required of conventional hangers is about 25% for spring hangers and about 6% for constant hangers. Spring hangers and constant hangers are used selectively depending on the tolerance for stress changes in piping due to load changes, but within this tolerance range, it is quite possible to use gas instead of metal springs.

[0006]

[Example] The drawings will be explained. The cylinder 1 is locked to the construction at its upper end and contains a piston 2. The upper chamber of the piston communicates with the outside air through the hole 1a to form an atmospheric chamber 3, and the lower part is filled with oil to form an oil chamber 4. The rod 5 slidably passes through the bottom of the cylinder, and its upper end is locked to the piston 2.
A pipe W is suspended from the lower end. The balancer 6 has a closed cylindrical shape and houses an elastic bag 7 filled with high pressure gas. The bag body 7 is provided with a pipe 8 so that high-pressure gas can be introduced from outside the balancer, and a gas valve V1 is attached thereto. The balancer communicates with the oil chamber 4 through another pipe 9, and the pipe 9 is provided with a main valve V2 and a pressure gauge G. The oil chamber 4 is further provided with a pipe 10 and a drain valve V3.

Gas valve V1 and drain valve V3 are used when setting a load and are closed when in a supporting state. The main valve V2 stops the movement of the piston to facilitate installation work, and is opened when in use.

Although not shown, the balance device 6 may be a cylinder into which a free plunger is inserted instead of a cylindrical body containing an elastic bag, and the upper part of the plunger may be a gas chamber and the lower part an oil chamber, as shown in FIG. .

[0009]

[Operation] In the above structure, the pipe W always presses down the oil in the oil chamber 4 and pressurizes the elastic bag body 7. As mentioned above, if the amount of oil supplied and discharged by the oil chamber and the size of the elastic bag body are appropriately selected, it can be used as either a spring hanger or a constant hanger.

[0010] Nitrogen gas is suitable as the high pressure gas. Nitrogen gas is inert and poses no risk of combustion or explosion, preventing oxidative deterioration of rubber for elastic bags. In addition to lubricating the oil chamber, the oil used in the oil chamber also functions to shut off any leakage of high-pressure gas.

[0011] However, it is necessary to consider temperature changes in the environment in which high-pressure gas is used. The volume of oil does not change much with temperature changes, but the pressure and volume of the gas inside the bag change with temperature changes. Even when the rod is stably stationary, if the environmental temperature changes by 10°C, the pressure inside the elastic bag will change by 4 to 5%. It is desirable to use this device indoors where there are few temperature changes. It is ideal if the tube 9 is extended and the balancer is placed in a constant temperature room separate from the cylinder.

[0012] When comparing the prototype product A of the present invention, which can support a load of 5 tons, with the known constant hanger B, the product weight of B is 900 kg, while that of A is 80 kg, which is approximately 1
/10. Although the shapes of the two are completely different, the space occupied by A is about 1/4 that of B. In this case, the cylinder inner diameter of A was 80 mm, and the rod outer diameter was 45 mm.

[0013]

[Effect] It becomes unnecessary to use large metal springs that are difficult to manufacture. The weight and volume of the entire device are greatly reduced, making it easier to handle.

[0014]

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the structure of the present invention.

[0015]

[Explanation of symbols]

1 Cylinder 2 Piston 3 Atmospheric chamber 4 Oil room 5 Rod 6 Balance device 7 Elastic bag body 8,9,10 pipe V1, V2, V3 valve

Claims (2)

[Claims] [Claim 1] A cylinder with a built-in piston, an atmospheric chamber on one side and an oil chamber on the other side, a rod that passes through the oil chamber side cover of the cylinder and whose inner end is locked to the piston, and an elastic cylinder containing high-pressure gas. Gas pressure piping consisting of a sealed cylindrical balance device with a built-in bag and the remaining space communicated with the oil chamber, and one of the outer end of the rod and the outer end of the cylinder is fixed to a structure, and the other is fixed to the piping. Support device. 2. The piping support device according to claim 1, wherein a free plunger capable of sliding in an axial direction is provided in the balance device, and one side of the free plunger is used as a high pressure gas chamber instead of an elastic bag.