JP2732938B2 - High pressure vessel - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure container for subjecting an object to be processed to pressure treatment via a hydraulic medium.

[Conventional technology]

As is well known, the technology of pressurizing an object to be processed through a hydraulic fluid is widely applied to a new material field represented by a CIP device for isostatic pressing of a powder of metal or ceramic. In recent years, its application range has been expanding to new fields such as pressure sterilization of foods.

In these high-pressure vessels, the structure of the lid that closes the opening for loading and unloading of the object to be processed affects the processing efficiency. Various configurations are employed depending on the pressure region to be applied.

To illustrate the typical configuration of these conventional high-pressure vessels,
This is as shown in FIG. 4 to FIG.

That is, in a relatively low-pressure region, as shown in FIG. 4, a cylindrical pressure vessel (41) having a high-pressure chamber (42) for introducing a hydraulic fluid and an upper open end thereof are generally provided. The seal between the upper lid (43) and the pressure vessel (41)
The O-ring (44) fitted to the upper end surface of the upper cover (43), while the axial load applied to the upper cover (43) is
Is carried by a plurality of bolts (45) fastened to the pressure vessel (41).

However, with such a configuration, when the pressure becomes high,
Due to the increase in the axial load applied to the upper lid (43), the bolt (45) carrying the same increases, and a gap is created between the pressure vessel (41) and the upper lid (43), and the O-ring (44) protrudes. It is rarely used in a high-pressure region (for example, 1 kb or more) because the sealing effect may be lost.

Therefore, in the high pressure region, as shown in FIG.
On the lower surface of the upper lid (53), a fitting projection (53a) for fitting into the upper opening of the pressure vessel (51) is projected, and an O-ring (54) is annularly mounted on the outer periphery thereof. ) By sealing the pressure vessel (51) and the upper lid (53) with the O-ring (54) on the outer periphery, the upper lid (53) is connected to the pressure vessel (5).
A structure that can maintain the sealing effect between the pressure vessel (51) and the upper lid (53) even when the bolt (55) fastened to 1) is elongated is used.

However, in this case, as the applied pressure region increases, the number of bolts (55) is required to suppress the high pressure in the high-pressure chamber (52), and the upper cover ( Since the opening and closing of 53) is troublesome and it is difficult to automate the opening and closing, the structure shown in FIG. 6 or FIG. 7 is widely used industrially.

6 and 7, the configuration of the seal portion is the same as that of the example of FIG. 5, and the means for carrying the axial load applied to the lid by the high pressure in the high-pressure chamber are different from each other. It is said that.

Here, what is shown in FIG. 6 includes a cylindrical container body (61), a screw-in type upper lid (63) and a lower lid (65) for closing the upper and lower openings of the container body (61). The seal between the container body (61) and the upper lid (63) and the lower lid (65) is provided on the outer periphery of the fitting projections (63a) (65a) of the upper lid (63) and the lower lid (65). O-ring (64) (6)
The axial load applied to the upper lid (63) and the lower lid (65) is carried by screwing these with the container body (61). The lower lid (65) is provided with a pressure medium supply / discharge port (65b) communicating with a high-pressure liquid supply / discharge means (not shown), and the upper lid (63) is provided with an air vent (63b). .

In this example, the object to be processed M is loaded into the high-pressure chamber (62) from above after the upper lid (63) is unscrewed and opened.

On the other hand, what is shown in FIG. 7 is a cylindrical container main body (71), a hollow box-shaped fixed base (77) for fixing and supporting a lower portion of the container main body (71), Container body (71)
An upper lid (73) and a lower lid (75) for closing the upper and lower openings of the upper frame (73), and the upper lid (73) is moved up and down by an upper lid elevating device (78) disposed above the fixed frame (77). In addition to being free to move and swivel, the fixed base (77) surrounds the upper lid (73) and the lower lid (75) together with the container body (71) from the periphery, and the upper lid (73) and the lower lid (75). A carriage (79) that carries a moving frame (79) that carries an axial load applied to the fixed base (77) and that runs on a rail (80) laid on the base (77a) of the fixed base (77) is provided. And the container body (71)
The seal between the upper lid (73) and the lower lid (75) is provided by an O-ring (74) (74) mounted on the outer periphery of the fitting projections (73a) (75a) of the upper lid (73) and the lower lid (75). The axial load applied to the upper lid (73) and the lower lid (75) during the pressurizing process is carried by the moving frame (79).

The lower lid (75) is provided with a pressure medium liquid supply / discharge port (75b) communicating with a high-pressure liquid supply / discharge means (not shown), and the upper lid (73) is provided with an air vent (73b). .

In this example, the object M is placed by moving the moving frame (79) to the position shown by the solid line in the figure, raising and turning the upper lid (73) by the upper lid elevating device (78), and then opening the upper lid (73). It is charged in the room (72).

[Problems to be solved by the invention]

However, in the conventional high-pressure vessel shown in FIG. 6, although a relatively simple apparatus configuration can be adopted, the upper lid (63) is closed every time the object to be processed M is loaded and unloaded into the high-pressure chamber (62). Since it has to be rotated for loading and unloading, there is a problem that a longer preparation time is required as compared with the pressurization processing time, and it is difficult to increase the operation efficiency of the apparatus.

On the other hand, in the conventional high-pressure container shown in FIG. 7, the moving frame (79) and the upper lid elevating device (78) are automatically linked to each other to save labor. However, there is a problem that it is difficult to expect a significant improvement in operation efficiency, and that the apparatus configuration is complicated and a large power is required to move the movable component.

Furthermore, in the conventional high-pressure container shown in FIGS. 5 to 7, the fitting projection of the upper lid is repeatedly attached and detached along the inner wall of the opening of the container body every time the object to be processed is charged and unloaded. The misalignment between the upper lid and the container body, which is liable to occur during the attachment or detachment, or the overhang of the metal backup ring conventionally used to back up the O-ring mounted on the fitting projection, causes There is a problem that the fitting surface is scratched, and it is easy to cause a failure in sealing soon, and it is difficult to maintain the sealing life long.

The present invention has been made in order to solve the above-described problems of the related art, and a high-pressure container without detaching a sealing member that seals between the high-pressure container main body and the upper lid from the high-pressure container main body together with the upper lid. The upper part of the main body can be opened and closed, and the attachment and detachment of the upper lid, that is, the loading and unloading of the object to be processed can be facilitated. It is an object of the present invention to provide a high-pressure container which can be performed reliably, can maintain the sealing life for a long time, and can simplify the device configuration.

[Means for solving the problem]

In order to achieve the above object, the present invention has the following configuration. That is, the high-pressure container according to the present invention is a cylindrical pressure container having a pressure chamber for introducing a pressure medium therein,
An upper lid detachably disposed at an upper opening end of the pressure vessel,
An upper lid holding means disposed above the upper lid and carrying an axial load to be applied to the upper lid, and pressurizing the object to be processed loaded in the pressure chamber via a pressure medium. In the high-pressure container, a vertical through hole is provided in the upper lid holding means concentrically with the pressure container, and the lower surface of the upper lid is formed in a plane, while the inner diameter of the upper opening end of the pressure container is made larger than the diameter of the pressure chamber. Formed in a large diameter, the large diameter portion has an inner diameter substantially the same as the diameter of the pressure chamber, and an annular seal member having a seal ring mounted on its outer periphery is slidably fitted in the axial direction, and A seal surface having an outer diameter smaller than the seal ring diameter is formed at an upper end of the annular seal member which is in contact with a lower surface of the upper lid.

Further, the annular seal member has an O-ring fitted on the seal surface, while the upper lid holding means presses the upper lid downward to cause an initial adhesion force between the lower surface thereof and the seal surface of the annular seal member. May be provided.

[Action]

The operation of the present invention will be described below with reference to FIG. 1 which is a front sectional view showing the arrangement of the main components, as an example.

In the present invention, the upper lid (3) disposed at the upper opening end of the cylindrical pressure vessel (1) having the pressure chamber (2) for introducing the pressure medium therein has a lower surface formed flat. , Can be moved to the side.

Immediately above the upper lid (3), an upper lid holder (4) for carrying an axial load to be applied to the upper lid (3) is provided with a pressure vessel (1) via holding means (not shown). )
Are fixedly arranged.

A center hole (4a) having a diameter substantially equal to the diameter d of the pressure chamber (2) is provided in the upper lid holder (4) so as to penetrate the pressure chamber (2) in the vertical direction. ing.

On the other hand, the inner diameter of the upper opening end of the pressure vessel (1) is formed to be larger than the diameter of the pressure chamber (2).
a) has an inner diameter substantially the same as the diameter d of the pressure chamber (2);
An annular seal member (5) having a seal ring (6) mounted around the outer periphery thereof is slidably fitted in the axial direction.

Further, the upper lid (3) in contact with the lower surface the upper end of the annular sealing member (5), said sealing surface of diameter D ₁ smaller outer diameter D ₂ of the sealing ring (6) (5a) is formed.

Under this configuration, first, the upper lid (3) is retracted to the side indicated by the dashed line in FIG. 1, the upper end of the pressure vessel (1) is opened, and the center of the upper lid holder (4) is opened. Following the loading of the workpiece M into the pressure chamber (2) from above through the hole (4a),
A pressure medium (1) is introduced into the pressure chamber (2) from above from the pressure medium W
Until it overflows from the top of
The upper lid (3) is returned to the reference position indicated by the solid line in FIG. At this time, the lower surface of the flat upper cover (3) covers the upper surface of the annular sealing member (5) and is in close contact with the upper sealing surface (5a). The pressure medium liquid W is supplied to the pressure vessel (1).
Is filled up to the upper end, so that no air remains under the upper lid (3).

From this state, a high hydraulic pressure is introduced into the pressure chamber (2) through the pressure medium liquid supply / discharge port (1b) provided at the lower bottom of the pressure vessel (1), and the pressure processing of the workpiece M is performed. The hydraulic pressure Pi in the pressure chamber (2) is not limited to the lower surface of the upper lid (3) communicating through the inner hole of the annular seal member (5), but to the large diameter portion of the pressure vessel (1). It also acts on the lower surface of the annular seal member (5) fitted in (1a).

Meanwhile, a seal ring (6) is mounted around the outer periphery of the annular seal member (5), and the seal ring (6) is provided.
Between the outer periphery of the annular seal member (5) and the inner surface of the large diameter portion (1a), and the annular seal member (5).
Is inserted into the large-diameter portion (1a) so as to be slidable in the axial direction, and is pushed upward by the action of the hydraulic pressure Pi in the pressure chamber (2) on the lower surface thereof, and the sealing surface at the upper end thereof Attempt to push up the top lid (3) via (5a).

However, since the upper lid (3) is prevented from rising by the upper lid holder (4) disposed above the upper lid (3), the sealing surface (5a) of the annular seal member (5) is reduced.
Is pressed against the lower surface of the upper lid (3) with a surface pressure Pc corresponding to the hydraulic pressure Pi acting on the lower surface of the upper cover (3).

Here, the hydraulic pressure Pi in the pressure chamber (2) acting on the lower surface of the upper lid (3) and the annular seal member (5) and the sealing surface (5a) of the annular seal member (5) due to the reaction force of the upper lid (3). ) Is expressed by the following equation.

The outer diameter of ^{_{Pc = Pi × (D 1 2}} -d 2) / (D 2 2 -d 2) ( where, D ₁ is the diameter of the sealing ring (6), D ₂ is the sealing surface (5a), d is the pressure is a diameter of the chamber (2).) On the other hand, the outer diameter D ₂ is a seal ring sealing surface (5a) (6)
Is smaller than the diameter D ₁ (D ₁ > D ₂ ), so that Pc> Pi is obtained by rearranging the above equation.

That is, the surface pressure Pc between the sealing surface (5a) of the annular sealing member (5) and the lower surface of the upper lid (3) is always the pressure chamber (2).
Since the internal pressure Pi is higher than the internal pressure Pi, the seal between the annular seal member (5) and the upper lid (3) in the process of the pressurizing process is reliably achieved.

After the pressure treatment, the pressure in the pressure chamber (2) is released, the upper lid (3) is retreated to the side again, the upper end of the pressure vessel (1) is opened, and the center of the upper lid holder (4) is opened. The object M is taken out of the pressure chamber (2) through the hole (4a). When the pressure in the pressure chamber (2) is released, the action of the hydraulic pressure Pi on the lower surface of the annular seal member (5) is achieved. The upper cover (3) can be easily retracted to the side.

As described above, in the present invention that achieves the seal between the pressure vessel and the upper lid through the annular seal member that utilizes the action of the hydraulic pressure in the pressure chamber, without detaching the annular seal member that performs the seal, Only by retreating the upper cover to the side, the object to be processed can be efficiently loaded and unloaded into the pressure chamber.

In the above description, the seal between the upper lid and the annular seal member is achieved by a so-called metal touch. However, while the O-ring is fitted on the seal surface of the annular seal member,
In a case where the upper lid holder is provided with a pressing means for pressing the upper lid downward to impart an initial adhesion force between the lower surface thereof and the sealing surface of the annular seal member, when the pressure in the pressure chamber is increased, the annular seal member is pressurized. Initial stage of rising by the action of the liquid pressure in the chamber, receiving the reaction force of the upper lid and the upper lid holder above it, and bringing the sealing surface into close contact with the lower surface of the upper lid with a surface pressure that can oppose the liquid pressure in the pressure chamber In this case, the O-ring on the sealing surface is pressed by the lower surface of the upper lid, and the seal between the upper lid and the annular sealing member can be reliably ensured.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2a is a front sectional view showing a main part of an example of the high-pressure container of the present invention, and FIG. 2b is a partial sectional view taken along line AA of FIG. 2a. This example is based on the configuration of FIG.
The same parts as those in FIG. 1 are denoted by the same reference numerals, and the description is referred to.

To supplement the description, in this example, the upper lid holder (4)
The pressure vessel (1) is fixed to the upper portion of a fixed frame (7) disposed so as to surround the pressure vessel (1) from the periphery. Further, a ring cylinder (8) for giving an initial adhesion force to the upper lid (3) is mounted on the lower end of the upper lid holder (4).

The ring cylinder (8) is communicated with a hydraulic pressure supply control device (11), and the hydraulic pressure supply control device (11) controls the pressing force on the lower upper lid (3).

The upper lid (3) is supported by a fixed frame (7) and connected to an output shaft of a horizontally arranged cylinder (10), as shown in FIG. 2b.
Of the upper cover holder (4) along the pressing claw (8a) at the lower end of the ring cylinder (8) between the lateral retreat position shown by the dashed line in the figure and the reference position shown by the solid line in FIG. And can be moved sideways. Further, the cylinder (10) is communicated with the hydraulic pressure supply control device (11) and is operable in cooperation with the operation of the ring cylinder (8).

An O-ring (9) is fitted on the sealing surface (5a) of the annular sealing member (5) fitted into the large diameter portion (1a) of the pressure vessel (1). The large diameter part (1a) of the pressure vessel (1)
A plurality of radial grooves (not shown) are provided on the lower bottom surface for guiding the hydraulic fluid W to the lower bottom surface of the annular seal member (5).

The hydraulic fluid supply / discharge port (1b) at the lower bottom of the pressure vessel (1) is connected to a pressurizing device (12). Pressure chamber (2) through port (1b)
Introduced within. A shallow dish-shaped recess (1c) having a diameter larger than the diameter of the upper lid (3) is formed on the upper surface of the pressure vessel (1).

Here, the positional relationship between the annular seal member (5), the upper lid (3), and the upper lid holder (4) in a no-load state will be described. The annular seal member (5) is at the lower limit position and its sealing surface ( 5a) is slightly projected into the dish-shaped recess (1c). The upper lid (3) is supported by the pressing claw (8a) of the ring cylinder (8) at an upper position with a small gap between the lower surface thereof and the sealing surface (5a) of the annular sealing member (5). ing. The upper lid holder (4) is fixed to the fixed frame (7) at an upper position with a small gap between the lower surface and the upper surface of the upper lid (3). That is, the upper lid (3)
In a no-load state, there is a small gap above and below, and it can be easily laterally moved along the pressing claw (8a).

The pressurizing process using the high-pressure vessel having the above-described configuration will be described. First, the cylinder (10) is operated, and the upper lid (3) is moved to the retracted position to open the upper end of the pressure vessel (1). Then, following the loading of the object to be processed M into the pressure chamber (2) from above through the center hole (4a) of the upper lid holder (4), the pressure medium W is introduced into the pressure chamber (2) from above. The pressure vessel (1) is filled until it overflows from the upper end, and then the upper lid (3) is returned to the reference position. At this time, the hydraulic fluid W
Is filled up to the dish-shaped concave portion (1c) of the pressure vessel (1), so that air does not remain below the upper lid (3), and air is automatically vented.

Next, the ring cylinder (8) is operated, and the upper lid (3) is pressed downward via the pressing claw (8a), so that the lower surface of the upper lid (3) is brought into contact with the sealing surface (5a) of the annular sealing member (5). Abut. The pressing force at this time is set to a value sufficient to deform the O-ring (9) mounted on the sealing surface (5a) and bring the lower surface of the upper lid (3) into close contact with the sealing surface (5a).

Here, the space between the annular seal member (5) and the large diameter portion (1a) of the pressure vessel (1) is sealed by a seal ring (6) mounted around the outer periphery of the annular seal member (5). , The pressure vessel (1) and the upper lid (3) are in a state of being sealed via the annular sealing member (5) without directly contacting each other.

From this state, high hydraulic pressure from the pressurizing device (11) is introduced into the pressure chamber (2) through the hydraulic fluid supply / discharge port (1b), and the hydraulic pressure Pi is increased to a predetermined processing pressure. Increase the pressure.

Annular sealing member (5) with pressure increase in pressure chamber (2)
Is subjected to an upward axial load by the hydraulic pressure Pi applied to the lower surface thereof, and presses the upper lid (3) upward through the sealing surface (5a) at the upper end thereof, and the upper lid (3) itself is also annular. Since an upward axial load is applied by the hydraulic pressure Pi received on the lower surface communicating through the inner hole of the seal member (5), the upper surface of the upper cover (3) is brought into contact with the lower surface of the upper cover holder (4). Raised until touching.

At this time, the ring cylinder (8) is pushed back to the upper limit position under a state where a back pressure lower than the axial load applied to the upper lid (3) is applied.

During this time, the surface pressure Pc between the sealing surface (5a) of the annular sealing member (5) and the lower surface of the upper lid (3) is increased within the pressure chamber (2). Since the pressure is always higher than the hydraulic pressure Pi, the seal between the annular seal member (5) and the upper lid (3) in the process of pressurizing and pressurizing under a predetermined high pressure is reliably achieved.

Then, after the pressure treatment, the pressure in the pressure chamber (2) is released, and when the liquid pressure on the lower surface of the annular seal member (5) is released, the upper lid (3) is moved laterally to the retracted position, and the pressure is reduced. Container (1)
Is opened, and the object M after the pressure treatment is taken out of the pressure chamber (2) through the center hole (4a) of the upper lid holder (4). When the pressure is kept depressurized, the annular seal member (5) does not return to the lower limit position at an early stage due to sliding resistance. There is a concern that the sliding may damage the sealing surfaces and the O-ring (9) of each other.
Also, since it takes time to wait for the natural lowering, in this example, the ring cylinder (8) is reciprocated once immediately after depressurization, and the annular seal member (5) is moved to the lower limit position via the upper lid (3). To form a gap again above and below the upper lid (3). Thereafter, the upper lid (3) is moved laterally to the retracted position, so that the lower surface of the upper lid (3) and the annular sealing member (5) that perform sealing are formed. The sealing surface (5a) and the O-ring (9) were protected, and the time required to open the upper end of the pressure vessel (1) was reduced.

In the high-pressure container according to the present embodiment for performing the pressure treatment of the material to be treated M in this manner, the container is only retracted to the side of the upper lid without detaching the annular sealing member that seals between the container body and the upper lid. Since the upper part of the main body can be easily opened and closed, the time required for loading and unloading the object to be processed into and out of the pressure chamber can be shortened, the operation rate can be improved, and the sealing life can be maintained long. Further, automation can be achieved with a much simpler structure than the conventional high-pressure vessel shown in FIGS. 4 to 7 described above.

FIG. 3 is a front sectional view showing a main part of another example of the high-pressure container of the present invention. In this figure, parts equivalent to those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted. Only the differences will be briefly described.

In this embodiment, the difference from the embodiment shown in FIG. 2 is that a holding cylinder (1d) formed by extending the outer peripheral wall upward is formed at the upper end of the pressure vessel (1). The holding metal fitting (4) is fixed by screwing into the holding cylinder (1d). The ring cylinder (8) is a holding cylinder part (1d) of the pressure vessel (1) that surrounds the upper lid holding fitting (4).
It is mounted on the inner surface.

In addition, an advance / retreat port (1e) for allowing the upper lid (3) to move to the lateral retreat position is formed in the base end wall of the holding cylinder (1d), while the advance / retreat port (1e) An overflow hole (1f) for the pressure medium W is formed in the base end wall of the holding cylinder (1d) at a position substantially the same as the bottom surface of the advance / retreat port (1e) at a position different from the above. Further, the upper lid (3) is connected to a pull-out rod (14), and is moved laterally via the pull-out rod (14).

Then, a pressure medium supply / discharge port (1b) is provided at the bottom of the pressure vessel (1) as shown in the example shown in FIG. 2, and a liquid pressure supply control device (11) is provided in the high pressure chamber (2). In this example, a piston (13) connected to a pressing means (not shown) is inserted into the bottom of the pressure vessel (1) communicating with the high-pressure chamber (2). The pressure in the high-pressure chamber (2) is directly increased by press-fitting the piston (13).

The configuration of this example is effective when applied to a relatively small high-pressure vessel, and the apparatus structure can be made simpler and more compact.

In this embodiment, as in the example shown in FIG. 2, high hydraulic pressure from the hydraulic pressure supply control device (11) is supplied to the high pressure chamber (2) through the hydraulic fluid supply / discharge port (1b). Needless to say, the upper lid (3) may be moved sideways by the cylinder (10).

In the two examples described above, the O-ring (9) is fitted on the sealing surface (5a) of the annular sealing member (5). The seal may be achieved by metal touch between the lower surface of (3) and the sealing surface (5a) of the annular sealing member (5).

〔The invention's effect〕

As described above, the high-pressure container according to the present invention reliably achieves a seal between the pressure container and the upper lid during the pressurization process through the annular seal member that uses the action of the hydraulic pressure. In addition, the upper opening of the pressure vessel can be easily opened and closed by the lateral movement of the upper lid without detaching the annular sealing member serving as a seal between them, so that the loading and unloading of the object can be performed. The required time can be shortened, the operation rate can be improved, and the seal life can be maintained long. In addition, the structure of the device is simple, and its automation can be easily and economically achieved.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing an arrangement of main components of a high-pressure vessel of the present invention, FIG. 2a is a front sectional view showing a main part of a high-pressure vessel of one embodiment of the present invention, and FIG. 2A is a partial cross-sectional view taken along line AA of FIG. 3. FIG. 3 is a front cross-sectional view showing a main part of a high-pressure vessel according to another embodiment of the present invention. FIGS. 4 to 7 show main parts of a conventional high-pressure vessel. It is a front sectional view. (1) Pressure vessel, (1a) Large diameter section, (1b) Pressure medium supply / discharge port, (1c) Dish-shaped recess, (2) Pressure chamber,
(3) ... upper lid, (4) ... upper lid holder, (4a) ... center hole, (5) ... annular sealing member, (5a) ... sealing surface, (6) ... sealing ring, ( 7) Fixed frame, (8) Ring cylinder, (8a) Pressing claw,
(9) O-ring (10) Cylinder (11)
Hydraulic pressure supply control device, (12) ... Pressurizing device, M ... Workpiece, W ... Hydraulic fluid, Pi ... Hydraulic pressure, Pc ... Pressure pressure.

Claims (2)

(57) [Claims] 1. A cylindrical pressure vessel having a pressure chamber for introducing a pressure medium therein, an upper lid detachably mounted on an upper opening end of the pressure vessel, and an upper lid disposed above the upper lid. An upper lid holding means for carrying an axial load to be applied to the upper lid, wherein the upper lid holding means comprises a high-pressure container for pressurizing an object to be processed loaded in a pressure chamber through a pressure medium. A vertical through hole is provided concentrically with the pressure vessel, and the lower surface of the upper lid is formed to be flat, while the inner diameter of the upper opening end of the pressure vessel is formed to be larger than the diameter of the pressure chamber. The diameter portion has an inner diameter substantially the same as the diameter of the pressure chamber, and an annular seal member having a seal ring mounted on its outer periphery is slidably fitted in the axial direction,
A high-pressure container, wherein a seal surface having an outer diameter smaller than the seal ring diameter is formed at an upper end of the annular seal member that contacts the lower surface of the upper lid. 2. An annular seal member having an O-ring fitted on a seal surface, while an upper lid holding means presses the upper lid downward to make an initial close contact between the lower surface and the seal surface of the annular seal member. The high-pressure container according to claim 1, further comprising a pressing means for applying a force.