JPS6334673Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) This invention relates to an airtight device for keeping the opening/closing lid part of a sterilizer, such as a steam sterilizer, in which objects to be sterilized are sterilized in a pressure vessel airtight.

(Background Art) When transporting a pressure vessel, for example, as shown in FIG. It is pivotally connected by a shaft 5, the opening 6 of the pressure vessel 1 can be opened and closed by the door 3, and a square frame-shaped packing 7 is installed between the front surface 1a of the pressure vessel 1 and the rear surface 3a of the door 3. The pressure vessel 1 is configured to maintain airtightness within the pressure vessel 1 when the door 3 is closed.

However, conventionally, when installing such packing 7, as shown in FIG. Since the packing 7 only pressed against the rear surface 3a of the door, when the pressure inside the pressure vessel 1 increases, the end surface of the packing 7 deforms outward, causing the packing 7 to deform as shown by arrow a in FIG. Pressure steam and the like inside the container 1 are likely to leak.

In order to solve this problem, as shown in FIG. 3, the groove 8a into which the packing 7 is fitted is formed deeper than the thickness T of the packing 7, and is surrounded by the packing 7 and the inner surface of the groove 8a. It is considered that steam or air with a pressure higher than that of the steam sent into the pressure vessel 1 is fed into the space 10 through the pipe 9, and the packing 7 is strongly pressed against the rear surface 3a of the door 3 (Jet Kaisho). 56-40262). In this case, the door 3 has an appropriate mechanism (for example,
No.), the container is restrained from moving further away from the front surface 1a of the container than in the state shown in FIG.

By the way, with such a sterilizer, the pressure vessel 1
When sterilizing objects to be sterilized within the pressure vessel 1, the pressure within the pressure vessel 1 is changed as shown in FIG. That is, the pressure inside the pressure vessel 1 is first made negative and then returned to atmospheric pressure repeatedly, and the air that has permeated into the object to be sterilized is extracted. After that, pressure steam is supplied into the pressure vessel 1 to keep the pressure vessel 1 in a high temperature and high pressure state for a certain period of time. When this sterilization process is completed, the pressure inside the pressure vessel 1 is made negative again. After that, repeat the operation to return to atmospheric pressure,
The sterilization steam dries the moist object to be sterilized.

The pressure inside the pressure vessel of the sterilizer changes as described above, but in the previously invented airtight device shown in Fig. 3, there is a problem especially when the pressure inside the pressure vessel 1 is positive. Although this does not occur, if the pressure inside the pressure vessel 1 becomes negative, the following problems will occur. That is, in order to maintain the airtightness of the opening 6 by the packing 7 even when the pressure inside the pressure vessel 1 becomes negative, compressed air is kept in the space 10 at the back of the groove 8a. is fed to press the packing 7 against the rear surface 3a of the door 3. However, if the sliding surface between the groove 8a and the packing 7 is not airtight, the compressed air fed into the space 10 may , as shown by the arrow b in FIG. 3, passes between the sliding surfaces and enters the pressure vessel 1, increasing the pressure inside the vessel 1. If such compressed air enters, for example, the pressure vessel 1 during the drying process may
The internal pressure becomes as shown by the chain line X in FIG. 4, and a sufficient degree of vacuum cannot be obtained, resulting in insufficient drying of the objects to be sterilized. Furthermore, if the above-described entry of compressed air occurs during the vacuum process before the sterilization process, the air that has penetrated into the object to be sterilized will not be sufficiently removed, which may reduce the sterilization effect.

(Purpose of the present invention) The present invention solves the above-mentioned disadvantages and provides an airtight sterilizer that can effectively maintain airtightness between the opening and the door regardless of the pressure state inside the pressure vessel. The purpose is to provide equipment.

(Structure of the present invention) The airtight device of the sterilizer of the present invention includes a frame-shaped packing fitted in a groove provided on the front surface of the pressure vessel surrounding the opening of the pressure vessel, and a frame-shaped packing placed inside the groove. A pipe for supplying pressurized gas is provided, and another frame-shaped packing is attached to at least one of the front surface of the pressure vessel and the rear surface of the door located closer to the inner circumference than the groove, and when the pressure inside the pressure vessel is reduced. , this packing is sandwiched between the front surface of the pressure vessel and the rear surface of the door.

(Operation of the present invention) Since the airtight device of the sterilizer of the present invention is constructed as described above, when the pressure inside the pressure vessel is positive and the door is pressed outward by the pressure inside the pressure vessel. The airtightness between the door and the pressure vessel is maintained by the packing that is fitted into the groove near the outer periphery and pressed against the rear surface of the door by compressed air.
Also, when the pressure inside the pressure vessel becomes negative, the door is pushed toward the front inside the pressure vessel by atmospheric pressure,
A packing attached to the inner circumference of the groove is sandwiched between the rear surface of the door and the front of the pressure vessel to prevent compressed air leaking from the sliding surface between the groove and the packing from entering the pressure vessel. to prevent

(Embodiments of the present invention) Next, the present invention will be explained in more detail while explaining the illustrated embodiments.

FIG. 5 shows an embodiment of the invention. A groove 8 is formed in the front surface 1a of the pressure vessel 1 to surround the opening 6.
A packing 7 is fitted in the groove 8a.
In the space 10 at the back of the
One end of the pipe 9 is open for supplying compressed air to be pressed toward the rear surface 3a. Another frame-shaped packing 11 is attached to a portion between the groove 8a on the front surface of the pressure vessel and the opening edge 6a, surrounding the opening edge 6a. Furthermore, this frame-shaped packing 1
A convex portion 12 is provided on the front surface 1a near the front surface 1a. The amount of protrusion (height) of this convex portion 12 from the front surface 1a is made smaller than the amount that the frame-shaped packing 11 protrudes from the front surface 1a in a free state.
Further, the convex portion 12 may be formed continuously surrounding the opening edge 6a, or may be formed intermittently.

When performing sterilization work using a sterilizer having an airtight device configured in this way, after closing the door 3, compressed air is constantly supplied into the space 10 through the pipe 9 to close the packing 7 in the groove 8a to the door. 3 on the rear surface 3a. Therefore, when the pressure inside the pressure vessel 1 is positive and the rear surface 3a of the door 3 is pushed by the pressure inside the pressure vessel 1, as shown in FIG. are separated, and the packing 7 pushed out from the groove 8a by the force of compressed air maintains airtightness between the surfaces 1a and 3a. At this time, since the pressure inside the pressure vessel 1 has increased, the space 10 at the back of the groove 8a
The pressure difference between the inside and the inside of the container 1 becomes smaller, and the compressed air in the space 10 becomes less likely to leak into the pressure container 1 through the sliding surface between the groove 8a and the packing 7. Further, even if leakage occurs, no problem will occur.
This point is similar to the case of the previous invention shown in FIG.

Next, a case will be described in which the pressure inside the pressure vessel 1 is made negative in the preparation process before sterilization or the drying process after sterilization. In this case as well, compressed air continues to be fed into the space 10 at the back of the groove 8a through the pipe 9, but for example, if the size of the door 3 is about 1 m square, Since a force of up to 10 tons is applied, the packing 7 fitted in the groove 8a is pushed into the groove 8a, and the rear surface 3a of the door 3 is pushed into the groove 8a.
and the front surface 1a of the pressure vessel 1 becomes narrower. Therefore, the frame-shaped packing 11 provided inside the groove 8a is compressed between the both surfaces 1a and 3a, and
This frame-shaped packing 11 maintains airtightness between both surfaces 1a and 3a, and even if the compressed air sent into the space 10 leaks between the surfaces 1a and 3a through the sliding surface between the groove 8a and the packing 7. This compressed air is prevented from entering into the pressure vessel 1, and the pressure within the pressure vessel 1 is prevented from increasing. Note that at this time, the door 3 is pressed toward the front surface 1a of the pressure vessel 1 with a very strong force as described above;
The distance between the front surface 1a and the rear surface 3a of the door 3 is regulated by the protrusion 12 formed on the front surface 1a (not narrower than the height of the protrusion 12), so that the frame-shaped packing 11 is not compressed too much. is prevented.

In the above embodiment, the frame-shaped packing 11 and the convex part 12 are provided on the front surface 1a of the pressure vessel 1.
Even if it is installed on the rear surface 3a of the door 3, or on both sides 1a,
It may be provided at 3a.

(Effects of the present invention) Since the airtight device for the sterilizer of the present invention is configured and operates as described above, the airtightness between the opening of the pressure vessel and the lid is maintained regardless of the pressure state inside the pressure vessel. Good airtightness can be maintained, and high-pressure steam inside the pressure vessel can be prevented from leaking to the outside, or air can be prevented from entering the pressure vessel during vacuum stroke and increasing the pressure.

(Application example) Although it is different from the present invention, the frame-shaped packing 11 and the convex portion 12 can maintain airtightness due to the labyrinth effect even when combined with a conventional airtight device as shown in FIG. It can be made more complete.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view showing an example of a sterilizer, Fig. 2 is an enlarged sectional view of section A in Fig. 1 showing a conventional airtight device, and Fig. 3 is Fig. 2 showing an airtight device according to an earlier invention. Similar diagrams, FIG. 4 are diagrams showing pressure changes in the pressure vessel during sterilization operations, and FIG. 5 is a diagram similar to FIGS. 2 and 3 showing an embodiment of the present invention. 1... Pressure vessel, 1a... Front, 2... Hinge holder, 3... Door, 3a... Rear, 3b... Front, 4
... Hinge, 5 ... Shaft, 6 ... Opening, 6a ... Opening edge, 7 ... Packing, 8, 8a ... Groove, 9 ...
Pipe, 10...Space, 11...Frame packing, 12...Protrusion.

Claims (1)

[Scope of utility model registration request] A frame-shaped packing is fitted into a groove provided on the front side of the pressure vessel surrounding the opening of the pressure vessel that accommodates the object to be sterilized, and a pipe for feeding pressurized gas is provided in the deep part of the groove. Of the front surface of the pressure vessel and the rear surface of the door, which are located on the inner circumferential side of the groove and face each other,
An airtight device for a sterilizer, which comprises a separate frame-like packing attached to at least one side.