JP2013102817A - High-pressure steam sterilizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-pressure steam sterilizer in which the shelter density between a door body and an opening can be secured highly, and that can control the occurrence of unexpected steam leak.SOLUTION: The high-pressure steam sterilizer includes: a chamber arranged in the inside of a sterilizer body; a door body that opens and shuts a front surface opening 13 of the chamber; a chamber lid 51 that is arranged in the door body and has a toroidal packing that encircles the surrounding of the front surface opening 13; and a chamber lid adjustment screw 49 as a change section that changes the shelter density of the chamber lid 51 and the front surface opening 13.

Description

The present invention relates to a high-pressure steam sterilizer for sterilizing bacteria attached to an object to be processed such as a relatively small medical instrument, laboratory instrument, and tableware under high-pressure steam.

As one of the high-pressure steam sterilizers, a front opening chamber provided in the sterilizer body and a door body that seals the front opening of the chamber are provided, and water injected into the chamber is heated by a heating means such as a heater. It is known to perform a sterilization process (sterilization treatment) in which high-pressure steam sterilizes germs adhering to a relatively small medical instrument or tableware stored in the chamber while evaporating by heating. (See Patent Document 1).

Moreover, in such a high pressure steam sterilizer, between the front opening of a chamber and a door body,
It is sealed by a sealing member such as an annular packing surrounding the front opening. At this time, it is preferable that the door body and the front opening have a close opposing relationship so as to be in a sealed state.

Furthermore, when the front opening is closed by the door body, the state is detected by a door detection switch or the like, and when the front opening is closed by the door body, the chamber is placed under high-pressure steam. Yes. At this time, the door body can suppress steam leakage and the like by pressing the annular packing substantially uniformly without bending around the front opening (see Patent Document 2).

JP 2008-073390 A JP 2011-156224 A

By the way, in the high-pressure steam sterilizer, because the high-pressure steam is filled in the chamber during sterilization, the amount of compression of the annular packing changes due to variation in the shape of the annular packing, aging deterioration, etc. There has been a problem that it becomes a factor such as steam leakage.

In view of such a point, the present invention can ensure the sealing property between the door body and the front opening even when the annular packing has a variation in shape or aging, and suppresses the occurrence of unexpected steam leakage. It is an object of the present invention to provide a high-pressure steam sterilizer that can be used.

The high-pressure steam sterilizer according to the present invention includes a chamber disposed inside a sterilizer body, a door body that opens and closes the opening of the chamber, and a chamber that is provided on the door body and surrounds the periphery of the opening. A lid, and a changing unit that changes a degree of sealing between the chamber lid and the opening.

According to the high-pressure steam sterilizer of the present invention, a high degree of sealing between the door body and the opening can be ensured, and the occurrence of unexpected steam leakage can be suppressed.

Further, in the high-pressure steam sterilizer according to the present invention, the changing unit is changed so that the chamber lid approaches toward the opening in a direction in which the sealing degree becomes higher in accordance with aged deterioration of the sealing degree by the annular packing. It is characterized by that.

According to the high-pressure steam sterilizer of the present invention, even when the annular packing has deteriorated over time, a high degree of sealing can be ensured without replacing the annular packing.

Further, in the high-pressure steam sterilizer according to the present invention, the changing portion is a chamber lid adjusting screw that is held by a component of the door body and moves forward and backward so as to move the chamber lid toward and away from the opening. It is characterized by that.

According to the high-pressure steam sterilizer of the present invention, the chamber lid can be approached toward the opening with a simple configuration.

The high-pressure steam sterilizer of the present invention can ensure a high degree of sealing between the door body and the opening, and can suppress the occurrence of unexpected steam leakage.

1 shows a high-pressure steam sterilizer according to an embodiment of the present invention, in which (A) is a perspective view of a high-pressure steam sterilizer with a door closed, and (B) is a perspective view of a high-pressure steam sterilizer with a door open. is there. The interlock mechanism applied to the high pressure steam sterilizer which concerns on one Embodiment of this invention is shown, (A) is a side view of the principal part before a door lock, (B) is a side view of the principal part of a door lock state. is there. The interlock mechanism applied to the high pressure steam sterilizer which concerns on one Embodiment of this invention is shown, (A) is a perspective view of the principal part before interlock release, (B) is the perspective view of the principal part of an interlock release state. FIG. The interlock mechanism applied to the high pressure steam sterilizer which concerns on one Embodiment of this invention is shown, (A) is a front view of the principal part before interlock release, (B) is the front of the principal part of an interlock release state. FIG. The autoclave sterilizer which concerns on one Embodiment of this invention is shown, (A) is a front view of the autoclave of the state which removed the cover, (B) is sectional drawing which follows the AA line of (A). is there. The high-pressure steam sterilizer which concerns on one Embodiment of this invention is shown, (A) is sectional drawing which follows the BB line of FIG. 5 (A), (B) shows the relationship between a chamber rotation axis | shaft and a through-hole. It is sectional drawing of the principal part. The high pressure steam sterilizer which concerns on one Embodiment of this invention is shown, (A) is sectional drawing of the principal part of a door unlocked state, (B) is sectional drawing of the principal part of a door locked state.

Next, a high-pressure steam sterilizer according to an embodiment of the present invention will be described with reference to the drawings.
In addition, although the Example shown below is a suitable specific example in the high pressure steam sterilizer of this invention, and there may be various technically preferable restrictions, the technical scope of this invention is especially this invention. Unless otherwise specified, the present invention is not limited to these embodiments. In addition, the constituent elements in the embodiments shown below can be appropriately replaced with existing constituent elements and the like, and various variations including combinations with other existing constituent elements are possible. Therefore, the description of the embodiment described below does not limit the contents of the invention described in the claims.

In FIG. 1, a high-pressure steam sterilizer 10 is a bacteria attached to a relatively small object to be treated such as a medical instrument, a laboratory instrument, tableware, etc. (target is one that can be obtained by known autoclave sterilization or high-pressure steam sterilization). Sterilizer body 1 for sterilizing under high-pressure steam and having a substantially housing-like appearance
1, a door body 12 provided on the front surface of the sterilizer main body 11 via a hinge (an axis extending in the vertical direction in the figure) that is not shown, and a door body provided inside the sterilizer main body 11. A high-pressure steam sterilizer is formed by a substantially low-cylindrical chamber 14 having a front opening 13 that can be opened and closed by an opening 12 to allow a workpiece to be put in and out, and a door body 12 that is disposed in front of the sterilizer body 11. A so-called horizontal configuration including an operation panel 15 constituting the external appearance of the front face (front face) of 10 is adopted.

(Configuration of sterilizer body 11)
The sterilizer main body 11 is provided with a mounting shelf 16 for mounting an object to be processed such as a medical instrument inside a chamber 14. Further, the front plate 17 of the sterilizer body 11 is provided with a door closing detection switch 18, a lock shaft holding portion 19, and a long hole 20 extending in the vertical direction of the front plate 17 around the front opening 13.

The door closing detection switch 18 is disposed in the vicinity of the upper portion of the front plate 17 on the free end side (right side in FIG. 1) of the door body 12 with respect to the front opening 13, and protrudes from the front plate 17 of the sterilizer body 11. It has been. A door detection switch body (not shown) that is turned ON / OFF by the door detection switch 18 is disposed on the back side of the front plate 17 with respect to the door detection switch 18. Further, the door closing detection switch 18 is normally urged in the protruding direction by a push spring (not shown). As a result, the door closing detection switch 18 is displaced in the burying direction against the urging of the push spring when the front opening 13 is closed by the door body 12, and this displacement causes the door closing detection switch body to be turned on (the door closing state is changed). Detect). In this embodiment,
Switching pressure associated with fluctuations in the gap between the sterilizer body 11 and the door body 12 in cooperation with the operation switch body 21 that can be projected and retracted on the back side of the door body 12 so as to face the door closing detection switch 18 in the closed state. Variations are managed.

The lock shaft holding portion 19 is positioned between the door closing detection switch 18 and the long hole 20 and is fixed to the front plate 17. The lock shaft holding portion 19 has a lock shaft through hole 19 a penetrating in the vertical direction and a lock shaft through hole 19 a at the tip. Adjusting screw 2 that is screwed into the lock shaft holding portion 19 so that the
2 is provided.

The long hole 20 is arranged such that a wedge-shaped switch actuating piece 24 that is displaced in the vertical direction in conjunction with a slide displacement operation of a handle 23 that is slidable in the vertical direction on the door body 12 faces the back side of the front plate 17. Is formed. Accordingly, the long hole 20 is set to a length that is equal to or greater than the amount of sliding displacement in the vertical direction of the switch operating piece 24. An interlock mechanism 25 is disposed on the back side of the front plate 17 in which the long holes 20 are formed, as shown in FIG.

As shown in FIGS. 2 to 4, the interlock mechanism 25 is provided with a front plate 17 of the sterilizer body 11.
A solenoid 26 provided on the back side of the actuator 27, an actuator 27, a coil spring 28 for biasing the actuator 27 in the extending direction, an interlock release plate 29 for manually contracting the actuator 27 against the bias of the coil spring 28, and an actuator An interlock detection switch 30 that is disposed opposite to the tip of the actuator 27 and is turned on when the actuator 27 is in an extended state (non-energized state), and an O when the switch operating piece 24 is slid downward.
N lock detection switch 31 is provided.

In the sterilization start operation, first, when a main switch (not shown) of the operation panel 15 is turned on, a standby state is set. In this standby state, the solenoid 26
Is energized to be in an excited state, and the actuator 27 contracts so as to deviate from the moving passage (vertical passage) of the switch operating piece 24 against the biasing force of the coil spring 28 to be in the non-interlock position.

The door 12 is opened and the front opening 13 enters the chamber 14 (for example, the heater cover 1
6), the door 12 is closed and the front opening 13 is closed (sealed).
As described above, when the door body 12 is closed, the door detection switch 18 is turned ON to detect the closed state of the door body 12. Furthermore, when the handle 23 of the door body 12 is pushed down to maintain this sealed state, the switch operating piece 24 is simultaneously slid downward to turn on the lock detection switch 31. Thereby, the lock detection switch 31 detects that the door 12 is in a locked state.

By the AND (multiplication operation) of the door closing detection switch 18 and the lock detection switch 31 achieved by such an operation, the high-pressure steam sterilizer 10 becomes ready to start operation. In this state, the preparation in the standby state is completed by performing the desired setting with the operation panel 15. Further, when the operation panel 15 is operated in this standby state (for example, a sterilization process mode setting operation such as a sterilization temperature or a sterilization time or a sterilization process start operation), the solenoid 26 is de-energized, and the actuator 27 is turned on the coil spring 28 Switch actuating piece 24 by energizing
It advances (extends) on the moving path of the door and enters an interlock state.

That is, when the actuator 27 advances just above the switch actuating piece 24, even if the handle 23 is slid upward, the switch actuating piece 24 is prevented from being displaced upward, so that the door 12 is locked. Maintain the maintained interlock state. In this interlock state, the tip of the actuator 27 is connected to the interlock detection switch 3.
Since 0 is ON, for example, a lock state display section (not shown) provided on the operation panel 15 emits light (or lights up).

As a result, when the object to be processed is accommodated in the chamber 14 and the high-pressure steam sterilizer 10 is operated by setting the operation panel 15 with the door 12 closed and locked, the inside of the chamber 14 is in a high-temperature and high-pressure state. As a result, sterilization of the object to be processed is performed.

When the set sterilization mode (sterilization process) is started, a predetermined amount of water is injected into the chamber 14 and the water is disposed on the inner bottom of the chamber 14 (the bottom surface of the heater cover 16) (not shown). The material to be processed is sterilized while being heated and evaporated to maintain the inside of the chamber 14 at a predetermined temperature (set temperature). When a preset sterilization time has elapsed and the sterilization process is completed, the sterilization mode is completed through an exhaust / drying process inside the chamber 14.

When the sterilization mode is completed, the solenoid 26 is energized to be in an excited state, and the actuator 27 contracts to retract from the moving passage (vertical passage) of the switch operating piece 24 against the bias of the coil spring 28. Non-interlock position.

With the interlock state released, the door body 12 can be opened by pulling the handle 23 upward, and the object to be processed can be taken out.

Incidentally, in the present embodiment, an interlock release plate 29 is provided. The interlock release plate 29 is for manually releasing the interlock state.

For example, when a power failure or the like occurs in the interlock state during the sterilization process, the solenoid 26 remains in a non-energized state. Accordingly, the actuator 27 prevents the switch operating piece 24 from being slid upward, and the door body 12 cannot be opened. Therefore, the internal high-pressure steam in the chamber 14 does not leak out and is safe. is there.

However, there may be a case where it is desired to remove the object to be processed from the inside of the chamber 14 by forcibly manually releasing the interlock state in an emergency or the like.

For example, as shown in FIG. 2, the interlock release plate 29 is provided with a shaft 33 on the horizontal plate portion 17 a formed on the front plate 17 via an interlock bracket 32, and can be rotated around the shaft 33 as a fulcrum. It is said that. Further, the interlock release plate 29 protrudes to the outside from the actuator operating piece 29a that engages with the midway portion with the tip of the actuator 27 penetrating on one end side, and the horizontal plate portion 17a (the bottom surface of the sterilizer body 11). Operated piece 2
9b. The interlock release plate 29 is always kept in a vertical state as shown in FIGS. 3A and 4A by an urging spring and a weight balance.

On the other hand, a guide member 35 of an interlock release tool 34 for forcibly turning the interlock release plate 29 in contact with the operated piece 29b is provided on the bottom surface of the horizontal plate portion 17a.

The interlock release tool 34 is made of, for example, a thin metal plate, the maximum width of which is substantially the same as the inner width of the guide member 35, and the tip side is tapered (inclined on one side). One side inclined surface 34a formed on the front end side serves as a guide surface, and an interlock release tool 34 is provided.
Is inserted into the guide member 35 from the front end side, so that the operated piece 29 is placed on the one-side inclined surface 34a.
The tip of b abuts. When the interlock release tool 34 is further inserted, the operated piece 29b is guided to the one-side inclined surface 34a, the interlock release plate 29 rotates about the shaft 33, and the actuator operating piece 29a biases the coil spring 28. The actuator 27 is forcibly contracted against this.

As a result, the actuator 27 is retracted from above the switch operating piece 24 to release the interlock, allowing the slide displacement upward of the handle 23 and opening the door body 12.

The reason why the interlock release tool 34 is formed in a plate shape is, for example, to prevent any other member from being unexpectedly inserted into the guide member 35. On the other hand, since the shape and the like are simple, for example, when the interlock release tool 34 is lost, it can be easily handled by an alternative.

(Configuration of door body 12)
As shown in FIG. 5, the door body 12 includes a door hinge portion 37 supported at one end by a support portion 36 fixed to the front plate 17, and a chamber door portion 38 supported at a substantially center of the door hinge portion 37. , A door lock operation unit 39 supported at the other end of the door hinge portion 37, an outer surface cover 40 fixed to the door hinge portion 37, and an inner surface cover 41 fixed to the door hinge portion 37.

The door hinge portion 37 includes a door hinge shaft 42 supported by the support portion 36 and a pair of upper and lower frame frames 43 fixed to both ends of the door hinge shaft 42 in a state of being opposed to each other and having the door hinge shaft 42 as a rotation fulcrum.
, 44.

The frame frames 43 and 44 are made of a metal material such as aluminum, and those corresponding to the thickness and width of the door body 12 are employed. The outer cover 40 and the inner cover 41 may be directly fixed to the frame frames 43 and 44, or may be fixed via a bracket or the like (not shown).

As shown in FIG. 6A, the chamber door portion 38 includes a chamber bracket 45 having a substantially U-shaped cross section extending between the frame frames 43 and 44 at the center in the longitudinal direction and a frame frame inside the chamber bracket 45. The frame brackets 43 and 44 pass through the support block 46, the chamber bracket 45, the frame frames 43 and 44, and the support block 46 interposed between the frame brackets 43 and 44 so that the chamber bracket 45 and the support block 46 can rotate. A chamber rotation shaft 47 to be supported, a chamber lid 48 fixed to the inside of the support block 46, and a chamber lid adjustment screw that is interposed between the chamber bracket 45 and the support block 46 and whose tip is screwed to the support block 46. 49.

The chamber bracket 45 is positioned outside the frame frames 43 and 44 and is supported by the chamber rotation shaft 47 with a gap (play).

The support block 46 is composed of a metal block such as aluminum, and the frame frame 43,
It is in sliding contact (free insertion) to the extent that rotation is not hindered inside 44. Also, the support block 46
Includes a through hole 46 a through which the chamber rotation shaft 47 passes, and a female screw hole 46 b that communicates with the through hole 46 and engages with the chamber lid adjusting screw 49. Further, the support block 46 fixes the chamber lid 48 via a lid fixing screw 50.

As shown in FIG. 6B, the through-hole 46a is formed in a cross-sectional oval shape (substantially elliptical) having a long axis in the front-rear direction of the sterilizer body 11 perpendicular to the axial direction of the chamber rotation shaft 47. . Thereby, the support block 46 can be displaced in the front-rear direction of the sterilizer body 11 integrally with the chamber lid 48. Further, the through hole 46 a has a chamber lid adjusting screw 49 and a female screw hole 4.
By adjusting the relative screwing position with 6b, the displacement of the sterilizer body 11 in the front-rear direction is positioned by integrating the support block 46 with the chamber lid 48. Further, the through hole 46 a is formed by the door body 1.
Even when the relative position between the inner surface cover 41 and the front plate 17 is not in the parallel facing state when the 2 is in the closed state, the relative position between the chamber lid 48 and the front plate 17 is in the parallel facing state. In order to achieve this, it is formed so as to allow a slight backlash, in particular, a shake of the chamber lid 48 in the horizontal direction.

The chamber lid 48 includes a substantially disc-shaped chamber lid body 51 having a diameter larger than the opening diameter of the front opening 13 and a front opening when the door body 12 is closed by being exchangeably held by the chamber lid 51. And an annular packing 52 that is in close contact with the opening edge 14a of the chamber 14 so as to surround the outside of the chamber 13. Further, the chamber lid 48 adjusts the relative screwing position of the chamber lid adjusting screw 49 and the female screw hole 46 b, and the closer the chamber lid 48 is to the front of the sterilizer body 11 together with the support block 46, the annular packing becomes. 52 to the front plate 17 (
A high degree of sealing) is ensured. Therefore, when deterioration or the like occurs in the annular packing 52, the relative screwing position between the chamber lid adjusting screw 49 and the female screw hole 46 b is adjusted to displace the support block 46 toward the front plate 17. A high degree of adhesion (sealing degree) of the annular packing 52 can be ensured.

The chamber lid adjusting screw 49 is supported on the inner surface side of the bracket so as to be rotatable around the axis. Further, the chamber lid adjusting screw 49 is formed with an insertion hole 49a for adjusting a relative distance from the support block 46 by a tool such as a hexagon wrench. The insertion hole 49a faces the adjustment hole 40a formed in the outer surface cover 40, and the adjustment hole 40
It can be adjusted by inserting a tool from a. At this time, the adjustment hole 40a is normally closed by a cap 53 made of rubber or the like.

The door lock operation unit 39 is provided with a handle 2 within a range of a slide hole 40b formed in the outer cover 40.
The door 12 is brought into a locked / unlocked state by displacing 3 in the vertical direction.
The handle 23 includes a base 54 and an arched arm 55 having both ends fixed to the base 54.
And a shutter 56 (shown only in FIG. 1A) that covers the slide hole 40b from the back surface side. Further, the door lock operation unit 39 is slidably supported by the guide shafts 57 and 58 and slidably supported by the guide shafts 57 and 58 as shown in FIG. A lock bracket 59 having a substantially U-shaped cross section in which the frame frames 43 and 44 are positioned, and a lock shaft 60 that is fixed to the lock bracket 59 and passes through the lock shaft through hole 19a when the door body 12 is closed. It is equipped with.

The frame frames 43 and 44 are formed with shaft through holes 43a and 44a coaxial with the lock shaft through hole 19a when the door body 12 is closed. Also, a pair of guide shafts 5
7 and 58 have a length longer than the vertical displacement range of the lock bracket 59, and the frame frame 43,
44 is supported by an E ring or the like (not shown) in a retaining state. The lock bracket 59 fixes the base 54 with the shutter 56 interposed therebetween, and moves up and down in conjunction with the operation of the handle 23. The switch operating piece 24 is fixed to the lock bracket 59.

In such a configuration, when the door 12 is closed and the handle 23 is pulled down, the lock bracket 59 is guided by the guide shafts 57 and 58 and displaced downward. In conjunction with the downward displacement of the lock bracket 59, the lock shaft 60 and the switch operating piece 2
4 is displaced downward.

When the lock shaft 60 is displaced downward, it can penetrate the shaft through hole 43a, the lock shaft through hole 19a, and the shaft through hole 44a in this order, and the lid 12 can be locked in the closed state.

At this time, the tip of the lock shaft holding portion 19 faces the lock shaft through hole 19a (
A protruding screw 22 is provided. Thereby, the relative position of the lock shaft 60 and the lock shaft through-hole 19a can be adjusted by adjusting the protrusion amount of the adjusting screw 22 with respect to the lock shaft through-hole 19a. Therefore, this adjusting screw 2
As the amount of protrusion of the second lock shaft through the lock shaft through hole 19a increases, the lock shaft 60 is pressed toward the sterilizer main body 11, and the degree of closeness (sealing degree) of the annular packing 52 to the front plate 17 is ensured. Can do.

In addition, the degree of sealing between the annular packing 52 and the opening edge 14a of the chamber 14 in the present invention varies depending on the capability of the high-pressure steam sterilizer 10 such as the internal pressure (maximum set pressure) of the chamber 14, but the degree of sealing described above. In securing the above, for example, the initial sealing degree (before deterioration) of the annular packing 52 is used as a reference. Therefore, although the numerical limitation is not particularly illustrated, for example, the rotation angle in the tightening direction of one or both of the screws 22 and 49 can be numerically indicated by a scale or the like according to the operating time.

In the above embodiment, a configuration is disclosed in which the relative position between the lock shaft 60 and the lock shaft through hole 19a is adjusted by the adjusting screw 22 as a changing portion that changes the degree of sealing between the chamber lid 48 and the front opening 13. However, for example, the lock shaft holding part 19 is divided so as to include the lock shaft through hole 19a, and the divided lock shaft holding part 19 is moved closer and away to change the diameter of the lock shaft through hole 19a. There is no particular limitation as long as the relative position between the lock shaft 60 and the lock shaft through hole 19a can be adjusted. Moreover, you may comprise so that the diameter of the lock shaft 60 may be changed partially.

DESCRIPTION OF SYMBOLS 10 ... High-pressure steam sterilizer 11 ... Sterilizer main body 12 ... Door body 13 ... Front opening 14 ... Chamber 14a ... Opening edge 15 ... Operation panel 16 ... Mounting shelf 17 ... Front plate 17a ... Horizontal plate part 18 ... Closed door detection switch DESCRIPTION OF SYMBOLS 19 ... Lock shaft holding | maintenance part 19a ... Lock shaft through-hole 20 ... Long hole 21 ... Actuation switch body 22 ... Adjustment screw 23 ... Handle 24 ... Switch action piece 25 ... Interlock mechanism 26 ... Solenoid 27 ... Actuator 28 ... Coil spring 29 ... Inter Lock release plate 29a ... Actuator operating piece 29b ... Operated piece 30 ... Interlock detection switch 31 ... Lock detection switch 32 ... Interlock bracket 33 ... Shaft 34 ... Interlock release tool 34a ... One side inclined surface 35 ... Guide member 36 ... Support Part 37 ... Door hinge part 38 ... Cha Numeral door part 39 ... Door lock operating part 40 ... Outer cover 40a ... Adjustment hole 40b ... Slide hole 41 ... Inner cover 42 ... Door hinge shaft 43 ... Frame frame (upper)
43a ... Shaft through hole 44 ... Frame frame (bottom)
44a ... Shaft through hole 45 ... Chamber bracket 46 ... Support block 46a ... Through hole 46b ... Female screw hole 47 ... Chamber rotation shaft 48 ... Chamber lid 49 ... Chamber lid adjusting screw 49a ... Insertion hole 50 ... Lid fixing screw 51 ... Chamber Lid 52 ... annular packing 53 ... cap 54 ... base 55 ... arm 56 ... shutter 57 ... guide shaft 58 ... guide shaft 59 ... lock bracket 60 ... lock shaft

Claims (3)

A chamber arranged inside the sterilizer body, a door body for opening and closing the opening of the chamber,
A chamber lid provided on the door body and having an annular packing surrounding the periphery of the opening;
A high-pressure steam sterilizer comprising: a changing unit that changes a degree of sealing between the chamber lid and the opening. The said change part changes so that the said chamber lid may approach toward the said opening in the direction which a sealing degree becomes high according to aged deterioration of the sealing degree by the said annular packing. High pressure steam sterilizer. The said changing part is a chamber lid adjusting screw that is held by a component part of the door body and moves forward and backward so as to move the chamber lid toward and away from the opening. The high-pressure steam sterilizer according to 2.

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