JP2000352497A - Method for sealing gas in pressure container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent buckling and deformation of bellows, i.e., an inner component, when gas is sealed in an inner part of a pressure container, and to enhance quality and durability. SOLUTION: This gas sealing method supplies gas from a gas supply port 10 into one of the chambers 8 of a pressure container 2 partitioned by a bellows 6, until a predetermined pressure is reached, and closes the gas supply port 10 after the supply of gas. In this case, as the pressure in the one chamber 8 is increased by the supply of gas into the one chamber 8, a pressure medium such as liquid or gas is supplied into the other chamber 9 to increase pressure within the other chamber 9, thus supplying gas into the one chamber 8 while keeping the differential pressure between both chambers 8, 9 at a magnitude that is equal to or lower than a predetermined value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for filling a pressure vessel with gas at a predetermined pressure.

[0002]

2. Description of the Related Art For example, in a metal bellows-type accumulator, which is a kind of pressure vessel, when a gas at a predetermined pressure is sealed in a gas chamber, conventionally, a gas at a final predetermined pressure is immediately blown at the initial stage of sealing. To the room. Therefore, the gas pressure exceeds the allowable buckling pressure of the metal bellows, and the metal bellows may buckle and deform, causing a problem in quality or durability.

[0003]

SUMMARY OF THE INVENTION In view of the above, the present invention can prevent the bellows, which is an internal component, from buckling and deforming when gas is sealed in a pressure vessel. It is an object of the present invention to provide a method for charging a pressure vessel with gas, which can improve the quality or durability.

[0004]

In order to achieve the above object, a gas filling method for a pressure vessel according to claim 1 of the present invention is characterized in that gas is supplied from a gas supply port to one chamber of a pressure vessel partitioned by bellows. A method of filling a pressure vessel for supplying gas until a pressure is reached and closing the gas supply port after the supply of the gas, wherein the gas is supplied to the one chamber and the pressure in the one chamber increases as the pressure increases. A pressure medium such as liquid or gas is supplied to the other chamber of the pressure vessel to increase the pressure of the other chamber, and the pressure difference between the two chambers is maintained at a predetermined value or less. It is characterized by supplying gas.

According to a second aspect of the present invention, there is provided a gas filling method for a pressure vessel, wherein gas is supplied from a gas supply port to a gas chamber of a metal bellows type accumulator until a predetermined pressure is reached, and the gas supply is performed after the gas is supplied. A gas filling method for a pressure vessel in which a port is closed by a blind plate by using a pressure welding method, wherein a pressure difference between the gas chamber and the pressure chamber when supplying gas to the gas chamber is equal to or less than a predetermined value. The gas is supplied to the gas chamber while a pressure medium such as a liquid or a gas is supplied to the pressure chamber so as to maintain the pressure.

According to a third aspect of the present invention, there is provided a gas filling method for a pressure vessel, wherein a gas is supplied from a gas supply port to a gas chamber of a metal bellows type accumulator having a metal bellows until the gas reaches a predetermined pressure, and the gas is filled with the gas. A gas filling method for a pressure vessel in which the gas supply port is closed by a blind plate using a pressure welding method after the supply, wherein the remaining air in the pressure chamber of the accumulator is exhausted, and then the metal bellows is allowed in the gas chamber. Supplying a gas having a pressure equal to or lower than the buckling pressure and supplying a pressure medium having a pressure corresponding to the gas pressure of the gas chamber to the pressure chamber, and supplying gas to the gas chamber until the gas chamber reaches a predetermined pressure. The supply of the pressure medium to the pressure chamber is repeated.

[0007] As in the gas filling method according to the first aspect of the present invention having the above-described structure, gas is supplied to one chamber of the pressure vessel and the other side of the pressure vessel increases as the pressure in one chamber increases. When a pressure medium such as liquid or gas is supplied to the chamber to increase the pressure in the other chamber, and the gas is supplied to one of the chambers while maintaining the pressure difference between the two chambers at a predetermined value or less, the two chambers By setting the differential pressure to be less than the allowable buckling pressure of the bellows (the minimum pressure at which buckling occurs in the bellows), it is possible to suppress buckling of the bellows. Become. Therefore, if the magnitude of the differential pressure between the two chambers is set to be equal to or less than the allowable buckling pressure of the bellows in the text in the claims, the description of the claims will be applied to the pressure partitioned by the bellows. A gas filling method for a pressure vessel that supplies gas from a gas supply port to one chamber of a container until a predetermined pressure is reached, and closes the gas supply port after the supply of the gas, wherein the gas is supplied to the one chamber. As the pressure in the one chamber increases, a pressure medium such as liquid or gas is supplied to the other chamber of the pressure vessel to increase the pressure in the other chamber, and the pressure difference between the two chambers is increased. This is a gas filling method for a pressure vessel characterized in that gas is supplied to the one chamber while maintaining the pressure at or below the allowable buckling pressure of the bellows. To keep the pressure below the pressure, It is preferred to supply the gas to the one chamber while detecting the magnitude of the pressure.

Further, the present invention has the above-mentioned structure.
When a gas is supplied to the gas chamber of the metal bellows type accumulator as in the gas filling method described above, a liquid or gas or the like is filled in the pressure chamber so that the pressure difference between the gas chamber and the pressure chamber is maintained at a predetermined value or less. When gas is supplied to the gas chamber while supplying the pressure medium, the magnitude of the differential pressure between the two chambers is smaller than the allowable buckling pressure of the metal bellows (the minimum pressure at which buckling deformation occurs in the metal bellows). Buckling deformation of the metal bellows can be suppressed. Therefore, if the magnitude of the differential pressure between the two chambers is set to be equal to or less than the allowable buckling pressure of the metal bellows in the text in the claims, the description of the claims will be applied to the metal bellows type accumulator. A gas filling method for a pressure vessel in which a gas is supplied from a gas supply port to a gas chamber until a predetermined pressure is reached, and after the supply of the gas, the gas supply port is closed with a blind plate using a pressure welding method. When supplying a pressure medium such as a liquid or a gas to the pressure chamber so as to maintain a pressure difference between the gas chamber and the pressure chamber to be equal to or less than an allowable buckling pressure of the metal bellows when supplying gas to the chamber. In other words, in order to maintain the pressure difference between the two chambers at or below the permissible buckling pressure of the metal bellows, the two chambers must be filled with gas. Detects the magnitude of the differential pressure It is preferred to supply gas to the reluctant gas chamber.

Further, the present invention has the above-mentioned structure.
In the gas filling method, the gas is supplied at a pressure lower than the allowable buckling pressure of the metal bellows (the minimum pressure at which buckling deformation occurs in the metal bellows) every time the gas is supplied to the gas chamber of the metal bellows type accumulator. In addition, it is possible to suppress buckling deformation of the metal bellows.

When the gas is sealed or sealed in the pressure vessel or an accumulator as an example thereof, liquid or liquid is introduced into the pressure chamber outside the bellows so as not to exceed the allowable buckling pressure of the bellows as an internal component. The pressure medium such as gas is filled, but the gas supply to the gas chamber and the pressure medium supply to the pressure chamber are alternately detected while detecting the differential pressure so that the differential pressure between the gas chamber side and the pressure chamber side is reduced. Can reach a predetermined pressure, thereby preventing buckling deformation of the bellows partitioning both chambers.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings. A method of filling a gas in a pressure vessel according to the embodiment is as follows: a gas chamber 8 of a metal bellows type accumulator 1 shown in FIG. Of gas.

The accumulator 1 shown in FIG. 1 is configured as follows.

First, a head plate member (also referred to as a lid member, an end cover or a gas end cover) 4 is welded and fixed to an open end of a bottomed cylindrical container body (also referred to as a shell) 3 to form a pressure vessel (also referred to as a housing). The pressure vessel 2 includes an operating member 5 made of a bellows 6. The bellows 6 has one end 6a sandwiched between the container body 3 and the end plate member 4, and has a bellows cap (also referred to as an end member) 7 integrally formed at the other end 6b. The inside of the pressure vessel 2 is divided into a gas chamber (also called a gas chamber) 8 inside the bellows 6 and a pressure chamber (also called a liquid chamber or fluid chamber) 9 outside. As the bellows 6, a metal bellows made of an electrodeposited bellows, a molded bellows, a welding bellows, or the like is used. However, depending on the use and use of the accumulator 1, other materials and types of bellows can be used. The bellows cap 7 may be formed separately from the bellows 6 and attached later.

A gas supply port (also referred to as a gas injection port) 10 for injecting a gas (also referred to as a gas) into the gas chamber 8 is provided in the end plate member 4 on the upper side of the figure. A blind plate (also referred to as a closing member) 11 for closing the gas supply port 10 after gas injection is provided, and the blind plate 11 is connected to the gas supply port 1 by pressure welding.
0 is firmly fixed to the periphery. Therefore, before the blind plate 11 is fixed, a gas of a predetermined pressure is injected from the gas supply port 10 into the gas chamber 8, and after the injection, the gas supply port 1
The gas at a predetermined pressure is sealed in the gas chamber 8 by closing 0 with a blind plate 11. As the type of gas to be filled, nitrogen gas or inert gas is suitable.

Further, an end wall 3a of the container body 3 on the upper and lower sides in the figure.
A pressure supply port 1 connected to a pressure pipe such as a hydraulic pipe (not shown) for introducing the pressure in the pressure pipe to the pressure chamber 9.
2 are provided. Therefore, the actuator 1
Is connected to a pressure pipe at a mounting portion (not shown), and the pressure in the pressure pipe is introduced into the pressure chamber 9 from the pressure inlet 12.

A vibration damping ring 13 is provided on the outer peripheral side near the other end 6b of the bellows 6 disposed in the pressure vessel 2, and when the bellows 6 expands and contracts, the vibration damping ring 13 holds the outer peripheral portion of the container with the outer peripheral portion. It slides on the inner peripheral surface of the main body 3. Accordingly, the bellows cap 7 moves parallel to the inner peripheral surface of the container body 3 and the bellows 6 expands and contracts parallel to the inner peripheral surface of the container body 3 by the sliding guide of the vibration damping ring 13. 7 or bellows 6 is prevented from biting against the inner peripheral surface of the container body 3. In order to prevent the pressure chamber 9 from being divided into the two spaces 9a and 9b by the vibration damping ring 13, a part of the circumference of the vibration damping ring 13 is cut off so that a pressure (not shown) is formed. A communication part is provided.

An annular sealing element 14 made of packing or the like is provided on an end surface of the bellows cap 7. When the bellows 6 is extended and the bellows cap 7 is lowered, the sealing element 14 is attached to the end of the container body 3. The pressure chamber 9 and the pressure supply port 12 are shut off in close contact with the inner surface of the wall 3a. Therefore, even after the cutoff, even if the pressure in the pressure pipe further decreases, the pressure in the pressure chamber 9 does not decrease, so that the sealed gas pressure in the gas chamber 8 and the pressure in the pressure chamber 9 maintain a balanced state. The bellows 6 is prevented from expanding, thereby preventing the bellows 6 from biting against the inner surface of the container body 3.

In order to fill a gas at a predetermined pressure into the gas chamber 8 of the accumulator 1 having the above-described structure, the gas is filled by using an apparatus shown in FIG. The accumulator 1 is closed so that the gas supply port 10 is closed by a blind plate 11 using a pressure welding method.
The pressure receiving welding electrode 21 for receiving the gas chamber 8 side of the pressure vessel 2 and the blind plate 11 disposed in the center hole of the pressure welding receiving electrode 21 are supported and the blind plate 11 is connected to the pressure vessel. A shaft electrode 22 for press-welding for pressing against the electrode 2 is provided in combination with each other so as to be relatively displaceable. The gas supply port 10 is surrounded by the electrodes 21 and 22 and the pressure vessel 2 of the accumulator 1. A gas supply pipe 28 of a gas supply unit 24 provided with required equipment such as a setter 25, a controller 26, and a pump 27 opens to a space 23 communicating with the gas supply pipe 28. The receiving electrode 21 for pressure welding includes an annular sealing element 29 such as a packing that is in close contact with the outer surface of the pressure vessel 2 of the accumulator 1 and that prevents leakage of supply gas. Also, both electrodes 2
An annular sealing element 30 is provided, such as packing, which insulates 1 and 22 from each other and prevents leakage of the supply gas.

On the pressure chamber 9 side of the pressure vessel 2 of the accumulator 1, there is provided a reaction force receiving member 31 for receiving a reaction force acting on the accumulator 1 at the time of gas supply. The reaction force receiving member 31 and the accumulator are provided. A pressure supply pipe 37 of a pressure supply unit 33 provided with necessary equipment such as a setter 34, a controller 35, and a pump 36, for a space 32 surrounded by one pressure vessel 3 and communicating with the pressure supply port 12, A common pipe 40 with the vacuum pipe 39 of the vacuum section 38 is open. In addition, the reaction force receiving member 31 is provided with an annular sealing element 41 such as packing, which is in close contact with the outer surface of the pressure vessel 2 of the accumulator 1 and prevents the inflow of air during evacuation and leakage of pressure during pressure supply. ing.

By operating the above device, the accumulator 1
In order to enclose a gas at a predetermined pressure in the gas chamber 8, first, from the state shown in FIG. 2, the evacuation unit 38 is operated to open its vacuum suction valve, and the remaining gas in the pressure chamber 9 of the accumulator 1 is exhausted. Then, after reaching a predetermined suction pressure, the gas supply unit 24
Is operated to supply gas at a predetermined supply pressure from the gas supply port 10 to the gas chamber 8, and when the pressure reaches the predetermined pressure P ₁ as shown in the pressure diagram of FIG. By actuating, a liquid as a pressure medium is supplied from the pressure supply port 12 to the pressure chamber 9 at a predetermined increasing pressure at the same increasing rate, and the pressure of each medium is increased as shown in FIG. _When the number reaches ₂ , supply is stopped,
First, the pressure in the pressure chamber 9 is decreased, the axial electrode 22 is pressurized, a current is applied together with the receiving electrode 21, the blind plate 11 is fixed to the end plate member 4 of the pressure vessel 2 by welding, and gas is supplied by the blind plate 11. The mouth 10 is closed. Then, the pressure P _G and the pressure chamber of the gas chamber 8, as shown in FIG. According to this method 9
Of the metal bellows 6 due to the pressure difference, since the gas is sealed in the gas chamber 8 while the difference between the pressure P _O and the pressure P _O is always kept at a value equal to or smaller than a predetermined value. Therefore, the quality or durability can be improved.

If the time extension is allowed instead of increasing the pressures P _G and P _O linearly,
As shown in FIG. 4, the gas supply and repeat the pressure medium supply to the pressure chamber 9 each pressure P _G to the gas chamber _8, may be increased gradually to P _O. Further, the gas may be a mixture of several types of gas regardless of the type of gas or liquid for the pressure medium.

[0022]

The present invention has the following effects.

First, in the gas filling method according to the first aspect of the present invention having the above-described structure, gas is supplied to one chamber of the pressure vessel, and the pressure of the pressure vessel is increased as the pressure in the one chamber increases. Because a pressure medium such as liquid or gas is supplied to the other chamber to increase the pressure in the other chamber, and the gas is supplied to one of the chambers while maintaining the pressure difference between the two chambers at a predetermined value or less. By setting the magnitude of the differential pressure between the two chambers to be equal to or less than the allowable buckling pressure of the bellows, the buckling of the bellows can be prevented, thereby improving the quality or durability of the bellows. be able to.

Further, the present invention having the above-mentioned structure is provided in claim 2 of the present invention.
In the gas filling method, when the gas is supplied to the gas chamber of the metal bellows-type accumulator, the pressure of the liquid or gas or the like is kept in the pressure chamber so as to maintain the pressure difference between the gas chamber and the pressure chamber at a predetermined value or less. Since the gas is supplied to the gas chamber while supplying the medium, the metal bellows is buckled and deformed by setting the magnitude of the differential pressure between the two chambers to be smaller than the allowable buckling pressure of the metal bellows. And the quality or durability of the metal bellows can be improved. Further, since the gas supply port is closed by the blind plate using the pressure welding method after the gas is supplied, the gas supply port can be firmly and completely closed.

Further, the present invention has the above-mentioned structure.
In order to supply this gas at a pressure equal to or lower than the allowable buckling pressure of the metal bellows every time the gas is supplied to the gas chamber of the metal bellows type accumulator,
Buckling deformation of the metal bellows can be prevented,
As a result, the quality or durability of the metal bellows can be improved. Further, since the gas supply port is closed by the blind plate using the pressure welding method after the gas is supplied, the gas supply port can be firmly and completely closed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a metal bellows-type accumulator to which a gas filling method according to an embodiment of the present invention is applied.

FIG. 2 is an explanatory view of a schematic configuration piping of a sealing welding apparatus used for performing a gas sealing method according to an embodiment of the present invention.

FIG. 3 is a graph showing an example of a pressure fluctuation state of a gas chamber and a pressure chamber.

FIG. 4 is a graph showing another example of the pressure fluctuation state of the gas chamber and the pressure chamber.

[Description of Signs] 1 Accumulator (metal bellows type accumulator) 2 Pressure vessel 3 Container main body 4 End plate member 5 Operating member 6 Bellows (metal bellows) 7 Bellows cap 8 Gas chamber (one chamber) 9 Pressure chamber (other chamber) DESCRIPTION OF SYMBOLS 10 Gas supply port 11 Blind plate 12 Pressure supply port 13 Vibration suppression ring 14, 29, 30, 41 Sealing element 21 Receiving electrode 22 Axial electrode 23, 32 Space 24 Gas supply unit 25, 34 Setting device 26, 35 Controller 27 , 36 pump 28 gas supply pipe 31 reaction force receiving member 33 pressure supply section 37 pressure supply pipe 38 vacuum evacuation section 39 vacuum evacuation pipe 40 shared pipe

Claims (3)

[Claims] 1. A gas is supplied from a gas supply port (10) to one chamber (8) of a pressure vessel (2) partitioned by a bellows (6) until a predetermined pressure is reached, and the gas is supplied after the gas is supplied. A gas filling method for a pressure vessel for closing a supply port (10), comprising supplying gas to said one chamber (8) and increasing the pressure in said one chamber (8). A pressure medium such as liquid or gas is supplied to the other chamber (9) of 2) to increase the pressure of the other chamber (9), and the two chambers (8) are increased.
(9) A gas filling method for a pressure vessel, wherein a gas is supplied to the one chamber (8) while maintaining the differential pressure at a value equal to or less than a predetermined value. 2. A gas is supplied from a gas supply port (10) to a gas chamber (8) of a metal bellows type accumulator (1) until a predetermined pressure is reached, and after the gas is supplied, the gas supply port (10) is pressed. A gas filling method for a pressure vessel closed by a blind plate (11) using a welding method, wherein a gas is supplied to the gas chamber (8) between the gas chamber (8) and the pressure chamber (9). A gas is supplied to the gas chamber (8) while supplying a pressure medium such as a liquid or a gas to the pressure chamber (9) so as to maintain the differential pressure at a value equal to or less than a predetermined value. Gas filling method. 3. A gas supply port (10) supplies a gas to a gas chamber (8) of a metal bellows-type accumulator (1) having a metal bellows (6) until the gas reaches a predetermined pressure. A gas filling method for a pressure vessel in which a gas supply port (10) is closed with a blind plate (11) by using a pressure welding method, after exhausting residual air in a pressure chamber (9) of the accumulator (1). A gas having a pressure equal to or lower than an allowable buckling pressure of the metal bellows (6) is supplied to the gas chamber (8), and a pressure medium having a pressure corresponding to the gas pressure of the gas chamber (8) is supplied to the pressure chamber (9). And supplying a gas to the gas chamber (8) and a pressure medium to the pressure chamber (9) are repeated until the gas chamber (8) reaches a predetermined pressure. Enclosure method.