JPH01169174A - Method for fixing cover to vessel - Google Patents

Abstract

PURPOSE:To enable a cover to be promptly and easily fixed and released by constituting the cover so as to be fixed to a vessel main unit by exhausting space between the first and second packings to be vacuumized after the cover is closed. CONSTITUTION:After a vessel main unit 2 is charged in its inside with a processed object, a cover 3 is manually closed, and closing opening and closing valves 13 and 14 and opening and closing valves 11 and 12, a vacuum pump 10 is operated. Then the inside of the vessel main unit 2 and the inside of annular space 9, formed by the first and second packings 4, 5, are exhausted, and the cover 3, being sucked by a vacuum pressure, is firmly fixed to a flange part 4. After the processed object in the vacuum applies a heating process, the opening and closing valve 11 is closed, and the vessel main unit 2 is pressurized to a positive pressure by introducing inert gas into a furnace. In accordance with a reaching degree of vacuum in the annular enclosed space 9, when diameters D and (d) are left as selected, the cover 3 is surely fixed to the flange part 4. After the processed object finishes its process in a furnace pressurized condition, in-furnace pressure is reduced to the atmosphere by opening the opening and closing valve 14, when the opening and closing valve 12 is closed and 13 is opened, the cover 3 can be easily and manually opened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a method for fixing a container lid to a container body.

[Conventional technology]

For example, in a vacuum furnace such as a vacuum heat treatment furnace, the inside of the furnace containing the material to be treated is evacuated and heated, and then the interior of the furnace is pressurized to above atmospheric pressure when the material is cooled with inert gas. In some cases, pressure is applied after evacuation. In a vacuum furnace for such a process, in order to keep the furnace lid closed during operation, the furnace lid M23 is attached to the container body 22, which is the furnace body, using an air cylinder 2, as shown in FIG.
The lid 23 and the container body 2 can be fixed together by pressing the lid 23 and the container body 2 with a plurality of wedge-shaped clamp fittings 27 or bolts driven by an air cylinder 26 as shown in FIG.
A method of fastening the 2-7 flange portions 24 is adopted.

Note that 28 is a sealing gasket, and 10 is a vacuum pump.

[Problem that the invention seeks to solve]

However, among the above-mentioned conventional methods, the method using an air cylinder is complicated and requires a large installation space, and the method using bolts is labor-intensive and complicated, and difficult to automate.

This invention solves the above-mentioned conventional problems and provides a method for fixing a container lid that can quickly and easily fix and unfix the lid, has a simple device, and does not take up much space. be.

[Means for solving problems]

However, in the method of the present invention, in a container provided with a lid for opening and closing an opening of the container body, a first gasket for sealing the gap is provided at the orange joint portion of the container body and the lid;
A second gasket is provided at a distance from the first gasket on the outer periphery side, and after the lid is closed, the space between the first gasket and the second gasket is evacuated by a vacuum pump to create a vacuum. This is a method of fixing a lid of a container by fixing the lid to the container body.

(Function) In the method of the present invention, by evacuating the space between the first packing and the second packing after closing the lid, the product of the vacuum level achieved by this evacuation and the area surrounded by the first packing and the second packing The lid is fixed to the container body by an adsorption force corresponding to . The seal diameters of the first and second gaskets should be set so that even if an internal pressure higher than atmospheric pressure is applied inside the container, the suction force will be greater than the opening force that pushes the lid in the direction of opening. For example, the lid is fixed to the container body.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, 1 is a vacuum heat treatment furnace, 2 is a bottomed cylindrical container body which is the furnace body, and 3 is an opening 2a of this container body 2.
The container body 2 is attached to the lid by a hinge (not shown).
It is rotatably supported around a vertical axis. The flange portion 4 of the container body 2, which overlaps with the lid 3 when the lid 3 is opened, has a first packing 5 surrounding the opening 2a, and a first packing 5 that surrounds the opening 2a.
The second one is located at a distance from the packing 5 toward the outer periphery of the flange.
A gasket 6 is provided. Reference numeral 7 denotes an exhaust hole, which opens in the annular flange surface 4a between the first packing 5 and the second packing 6. 8 is an annular flange surface 4 of the inner surface 3a of the lid 3.
It is an annular groove provided at a position opposite to a, and is provided as necessary to improve exhaust performance. 9 is an annular seal formed between the flange portion 4 and the lid 3 when the lid 3 is closed and surrounded by the first packing 5 and the second packing 6 (including the groove 8).
It is.

Reference numeral 10 denotes a vacuum pump for evacuation of the container body 2, which is connected to the container body 2 via an on-off valve 11, and the exhaust hole 7 is also connected to the vacuum pump 10 via an on-off valve 12. 13 and 14 are rf8M valves for introducing atmospheric pressure.

As each of the above-mentioned open valves, a manual type may be used, but it is preferable to use a remote control type such as an electromagnetic type or a pneumatic type. In addition, the container body 2 for vacuum heat treatment
Diagrams of the gas supply system and heating means for the object to be treated!
This is an abbreviation.

In the vacuum heat treatment furnace 1 having the above configuration, the container body 2 of the lid 3 is
Fixing and unfixing are performed as follows. First, after loading an object to be processed (not shown) into the container body 2, the lid 3 is manually closed, the on-off valves 13 and 14 are closed, the on-off valves 11 and 12 are opened, and the vacuum pump 10 is operated.

As a result, the inside of the container body 2 and the annular closed space 9 are evacuated and become a vacuum, and the lid 3 is attracted by this vacuum pressure and firmly fixed to the flange portion 4. After the object to be processed is heated in vacuum, the on-off valve 11 is closed, and the inside of the container body 2 is pressurized to a positive pressure of pressure P (gauge pressure) by introducing an inert gas into the furnace. At this time, the opening force F1 that pushes the lid 3 in the direction of opening due to the furnace internal pressure is expressed by the following equation, where d is the seal diameter of the first gasket 5 and D is the seal diameter of the second gasket 6, as shown in FIG. be done.

F+--d2XP...(1)
On the other hand, the attraction force F2 by which M3 is attracted to the flange portion 4 by the vacuum pressure poTorr acting on the annular tight space 9 is expressed by the following equation.

If the diameter and d8 are selected so that Fl < F2, depending on the degree of vacuum po achieved in the annular closed space 9 due to exhaustion of the vacuum pump 10, the lid 3 will reliably maintain its flange position even when the furnace is pressurized. It is fixed to part 4.

After the processing of the workpiece in the pressurized state in the furnace is completed, the on-off valve 14
Open the lid to reduce the pressure inside the furnace to atmospheric pressure, close the on-off valve 12, and open the on-off valve 13 [Atmospheric pressure is also introduced into the annular closed space 9, so the lid 3 can be opened manually. can.

The present invention is not limited to the embodiments described above, and the shapes of the lid 3 and the container body 2, the opening/closing drive mechanism of the lid 3, etc. may be other than those described above. Further, the first gasket 5, the second gasket 6, the exhaust hole 7, etc. may be provided on the lid 3 side. Furthermore, in the above embodiment, the vacuum pump 10 for evacuation of the container body 2 is used to evacuate the space between the first packing 5 and the second packing 6, so that the device is particularly 17! ′! i, but it is also possible to use another vacuum pump for the evacuation. In addition to various vacuum furnaces, the present invention can also be applied to fixing a lid to a container that is not evacuated inside the main body.

〔Effect of the invention〕

As explained above, according to the present invention, the lid can be fixed to the container body simply by exhausting the space between the first gasket and the second gasket provided at the overlapping portion of the container body and the lid, so that the lid can be quickly and easily fixed. It can be fixed and unfixed, and the fixing device is simple and takes up little space.

[Brief explanation of the drawing]

Fig. 1 is an equipment system diagram of a vacuum heat treatment furnace showing an example of the apparatus used in the method of the present invention, Fig. 2 is a detailed sectional view of section A in Fig. 1, and Figs. 3 and 4 are a diagram of a conventional lid. It is a separate system diagram of a vacuum heat treatment furnace showing a fixing method. 1... Vacuum heat treatment furnace, 2... Container body, 2a...
Opening part, 3... Lid, 4... Flange part, 5... First packing, 6... Second packing, 7... Exhaust hole,
10...Vacuum pump. 1st section beginning 20th 30th 40th

Claims (1)

[Scope of Claims] 1. In a container provided with a lid for opening and closing an opening of a container body, a first packing for sealing the opening is provided at an overlapping portion of the container body and the lid, and a first packing is provided from the first packing. A second packing is provided at an interval on the outer circumference side, and after the lid is closed, a vacuum pump is used to evacuate the space between the first packing and the second packing to create a vacuum, so that the lid is closed to the container body. How to fix the lid of a container. 2. Claims in which the container is pressurized to atmospheric pressure or higher after being evacuated, and the space between the first packing and the second packing is evacuated using the vacuum pump for evacuation. A method for fixing a lid of a container according to item 1.