JPH02283967A - Door device for pressure container - Google Patents

Abstract

PURPOSE:To reduce force required to move a door upward as well as to prevent the door from being energitically moved downward by fixing a cam member onto the front surface of the door in a state that the lower periphery which continuously varies in height to the direction normal to the door, comes in contact with a roller which is pivotally supported by a nut piece. CONSTITUTION:When a door 7 is moved upward, a nut piece 15 which is threadedly engaged with the male screw 14 of a twisting shaft 13 is moved to the left with a handle 12 rotated to the appropriate direction so that the door 7 is pushed upward by means of a roller 18 pivotally supported by the upper section of the nut piece 15 via a cam member 20. In a state that the door 7 is pushed upward, the first and second clutch are dislocated in phase, the door 7 can be opened/closed accompanied with the rocking motion of a rocking plate 3. When the door 7 is closed, the nut piece 15 is moved to the right with the handle 12 rotated reversely, and the door 7 is moved downward by means of the roller 18 pivotally supported by the upper section of the nut piece 15 via the cam member 20. In this condition, the first and second clutch member are consistent with each other in phase, and which incapacitates the rocking motion of the rocking plate 3 while the door 7 is left closed.

Description

[Detailed Description of the Invention] (Industrial Application Field) The pressure vessel door device according to the present invention is used as a door device for opening and closing the opening of a steam sterilizer used in hospitals and various research institutes. , can be used.

(Prior art) Steam sterilizers, which sterilize used patient clothes, surgical tools, laboratory instruments, etc. using high-temperature, high-pressure steam, are widely used in hospitals and various research institutes. It is used.

In the case of a steam sterilizer, the items to be sterilized are stored in a sterilization container, which is a pressure container, and after the opening of this sterilization container is closed with a door,
High-temperature, high-pressure steam is sent into a sterilized container. Therefore, the door of the sterilization container needs to have a structure that will not open due to the pressure of the water vapor sent into the sterilization container, and will not allow the high-pressure water vapor sent into the sterilization container to leak outside.

For this reason, the opening of the steam sterilizer has conventionally been opened and closed using a door device having a structure as shown in FIG.

In the door device shown in FIG. 5, reference numeral 1 denotes a rectangular frame-shaped front plate fixed to the opening periphery of a sterile container (not shown). The first clutch member 2.2 of the first clutch member 2.2 is fixed.

Further, on one side of the opening of the sterilization container, the base end of a rocking plate 3 is pivotally supported by a vertical shaft 4, and a folding plate 7 is fixed to the rear surface of the rocking plate 3. By engaging the guide piece 5.5 with a guide pin 6.6 fixed to the front surface of the guide piece 87, it is supported so as to be able to move up and down slightly.

By forming the door 7 to have a width smaller than the distance between the pair of clutch members 2.2, the door 7 is formed in a width smaller than the distance between the pair of clutch members 2.2. It is designed so that it can fit between the clutch member 2.2 of the clutch member 2.2. Further, second clutch members 8.8 are fixed to both side edges of the screen 7.

The edges of the second clutch member 8.8 and the first clutch member 2.2 that face each other are shaped with concave and convex shapes having the same pitch. , the second clutch member 2.8 can be freely engaged and disengaged.

Further, an I return shaft 9 is pivotally supported at the tip of the swing plate 3 in a direction perpendicular to the door 7, and one end of this torsion shaft 9 is provided with a torsion shaft at a portion facing the front surface of the door 7. A cam plate 10 whose radius around an axis 9 changes continuously is fixed. door 7
A roller 11 that rotates around an axis perpendicular to the door 7 is supported at the center of the front surface of the door 7, and the outer circumferential surface of the roller 11 and the outer circumferential surface of the cam plate 10 are always in contact with each other.

Furthermore, the above twist! 1iIII19 has a handle 1 on the other end.
2 is fixed and by operating this handle 12, the twisting l
The cam plate 10 is rotatably driven via l1lII9.

When opening and closing the opening of the sterilization container using the door device configured as described above, the procedure is as follows.

First, when opening and closing the handle 12, move it to the fifth position.
As shown by arrow a in the figure, the door 7 is raised by rotating it clockwise in the figure and bringing the roller 11 mounted on the front surface of the door 7 into contact with the large diameter portion of the cam plate 10.

In this state where the door 7 is raised, the convex portions of the second clutch member 8. 2.2, the second clutch member 8.8 becomes freely displaceable in the front and back directions of the door 7 relative to the first clutch member 2.2, and the opening/closing operation of the door 7 is performed. You will be able to do it.

When closing 5'iI7, move the second clutch members 8.8 fixed to both sides of this screen 7 toward the front plate 1 side beyond the uneven portion of the first clutch member 2.2. 5, rotate the handle 12 counterclockwise as shown by the arrow in FIG. 5, and bring the roller 11 into contact with the small diameter portion of the cam plate 10 to lower the J7i17. (Situation shown in Figure 5).

As a result, the convex portions of the first and second clutch members 2.8 are aligned with each other, and the door 7 with the second clutch members 8.8 fixed on both sides cannot be moved away from the front plate 1.
The opening of the sterile container is closed.

Even if high-pressure steam is sent into the sterilized container in this state,
Due to the engagement of the first and second clutch members 2.8, the folding screen 7 does not move in the opening direction, and the opening of the sterilization container is maintained in a closed state.

The airtightness between the front surface of the front plate 1 and the rear surface of the folding screen 7 is maintained by a backing attached to a groove formed on the front surface of the front plate 1. During this time, pressure gas is sent in, and the backing is pressed against the rear surface of the door 7 by the pressure of this pressure gas, so that the front plate 1
and 5i17 are kept airtight.

(Problems to be Solved by the Invention) However, in the pressure vessel door device constructed and operated as described above, conventional problems have occurred as described below.

That is, in the case of a conventional door device, cam plates 1 are attached to both ends of the torsion shaft 9.
0 and the handle 12 are fixed so that the rotation of the handle 12 is directly transmitted to the cam plate 10, so it is possible to provide a large reduction ratio until the movement of the handle 12 is transmitted to the door 7. If this is not possible and the weight of the door 7 is large, a large force will be required to raise the door 7.

Furthermore, when lowering the door 7, the direction in which the door 7 is about to fall due to gravity is the same as the direction in which the door 7 is about to move eight times due to the rotation of the handle 12, so the handle 12 is moved by force. It tends to rotate well.

The shape of the outer circumferential surface of the cam plate 10 is such that the handle 12 will not rotate due to the downward pressure caused by the gravity of the door 7, but if the handle 12 is inadvertently turned vigorously, the door 7 The speed of descent may become too fast.

The pressure vessel door device according to the present invention eliminates all of the above-mentioned disadvantages.

(Means for Solving the Problems) The door device for a pressure vessel of the present invention, like the conventional door device described above, has a pair of first clutch members fixed to both sides of the opening of the pressure vessel. , a rocking plate having a proximal end pivotally supported on one side of the opening of the pressure vessel; and a rocking plate having a width dimension smaller than the interval between the pair of clutch members, and supported on the rocking plate so as to be able to rise and fall slightly. The second clutch member is fixed to both side edges of the door and engages and disengages with the first clutch member as the door moves up and down. , by engaging and disengaging the second clutch members,
This door is made to open and close.

However, in the door device for a pressure vessel according to the present invention, a return shaft is pivotally supported at the tip of the swing plate in a direction perpendicular to the folding plate.

A male screw is carved into the outer circumferential surface of the folding part of this torsion shaft, while a nut piece is carved into the tip of the rocking plate.
It is supported so that it can move only toward and away from the door, and the male screw on the outer peripheral surface of the I return shaft and the nut piece are screwed together.

The upper part of this nut piece has a horizontal axis parallel to the door.
A roller is pivotally supported and in contact with a cam member fixed to the front surface of the door. The lower edge of this cam member extends perpendicularly to the door, and its height changes continuously.

Further, in the door device for a pressure vessel according to the second aspect, a nut member is fixed to the tip of the rocking plate with the screw hole facing in a direction perpendicular to the door.

At one end of the screw shaft screwed into the screw hole of this nut member, a truncated conical cam member is fixed to the part facing the front of the door, and a handle is fixed to the other end of the screw shaft. . A collision member is fixed to the front of the door, and this collision member
It is brought into contact with the upper surface of the cam member.

Furthermore, in the case of the door device for a pressure vessel according to claim 3,
In place of the truncated conical cam member in the invention set forth in claim 2, a second cam member whose outer peripheral surface is an inclined surface whose outer diameter changes spirally is provided at the end of the screw shaft. Fixed. The helical pitch of this second cam member and the pitch of the male screw formed on the outer peripheral surface of the screw shaft are made the same.

(Function) With the pressure vessel door device of the present invention configured as described above, when opening and closing the opening of the pressure vessel, the I-return is performed by operating the handle, as in the case of the conventional door device described above. By rotating the shaft or screw shaft and raising and lowering the door, the second clutch member fixed to the door side and the first clutch member fixed to the pressure vessel side are engaged and disengaged, and the door is opened and closed. .

That is, in the case of the pressure vessel door device according to claim 1,
When the return shaft rotates as the handle is operated, the nut piece screwed with the twisted glaze male screw moves toward and away from the door.
The door is raised and lowered by engagement between a roller pivotally supported on the upper surface of the nut piece and a cam member fixed to the front surface of the door.

Further, in the case of the door device for a pressure vessel described in claim 2.3, as the screw shaft rotates, the cam member fixed to the end of the screw shaft or the second cam member rotates around the circumference. It is displaced in the axial direction as well as in the axial direction, and the diameter of the portion of the cam member or the second cam member that comes into contact with the abutment member fixed to the front surface of the door changes, and the door moves up and down.

(Example) Next, the present invention will be explained in more detail while explaining the illustrated embodiment.

Figures 1 and 2 show an embodiment of the door device for a pressure vessel according to the present invention, as set forth in claim 1, with Figure 1 being a vertical sectional side view of the main part, and Figure 2 being an exploded perspective view. It is.

As shown in FIG. 5, the door device for a pressure vessel of the present invention is similar to the conventional door device described above, as shown in FIG. The first clutch member 2.2 of the pair is fixed, and the base end of the rocking plate 3 is pivotally supported on one side of the opening of the sterilization container by a vertical shaft 4.
This rocking plate 3 has a door 7, a guide piece 5.5 fixed to the rear surface of the rocking plate 3, and a guide bin 6.6 fixed to the front surface of the door 7.
It is supported so that it can be moved up and down a little by engaging with it.

The door 7, which is formed to have a width smaller than the spacing between the pair of clutch members 2.2, moves between the pair of clutch members 2.2 as the rocking plate 3 swings about the vertical shaft 4. A second clutch member 8.8 is fixed to both side edges of the screen 7. Second clutch member 8.
The mutually opposing edges of the first clutch member 2.2 and the first clutch member 2.2 have an uneven shape with the same pitch, so that as the door 7 is raised and lowered, the first and second clutch members 2.8 are engaged with each other. He is free to take off his clothes.

At the tip of the swing plate 3, a return @ 13 is pivotally supported in a direction perpendicular to the door 7, as shown in FIG. this) return shaft 13
A male screw 14 is engraved on the outer circumferential surface of the part (the part near the folding screen 7 (the part near the left in FIG. 1)).

Reference numeral 15 denotes a nut piece screwed into the male screw 14, which is supported by a support mechanism (not shown) at the tip of the swing plate 3 so that it can freely move only toward and away from the door 7 (left and right movement in FIG. 1). There is.

At the top of this nut piece 15, as shown in FIG.
It supports 8.

On the other hand, a cam member 20 is fixed to the lower surface of a reinforcing member 19 provided on the front surface of the folding screen 7.
1 and the upper surface of the roller 18, the weight of the door 7 is transferred to the cam member 2o, the roller 18, the nut piece 15, and the torsion shaft 13.
It is supported by the rocking plate 3 via.

The lower edge 21 of the cam member 20 is arranged in a direction perpendicular to the door 7 (first
The height of the height changes continuously.

With the door device for a pressure vessel of the present invention configured as described above, when opening and closing the opening of a pressure vessel such as a sterile container, the opening of the pressure vessel such as a sterile container can be opened and closed by operating the handle 12, as in the case of the conventional door device described above. 1 By rotating the return shaft 13 and raising and lowering the door 7, the second clutch member 8 fixed to both side edges of the folding screen 7 is opened.
．． 8 and the first clutch member 2.2 fixed to the sterilization container side, which is a pressure container, is engaged and disengaged, and this door 7 is opened and closed.

That is, when the torsion shaft 13 rotates with the operation of the handle 12, the nut piece 15 screwed with the male screw 14 of this torsion shaft 13 moves toward and away from the door 7, and the nut piece 15 provided on the upper part moves toward and away from the door 7. a roller 18 pivotally supported by a bifurcated portion 16;
The door 7 moves up and down by engagement with the lower edge 21 of the cam member 20 fixed to the front surface of the door 7.

For example, when raising the door 7 to open and close the folding screen 7, by rotating the handle 12 in an appropriate direction, the nut piece 1 screwed into the male screw 14 of the torsion shaft 13 is removed.
5 is moved to the left in FIG. 1, and a roller 18 pivotally supported on the upper part of this nut piece 15 pushes up the screen 7 via a cam member 20.

When the door 7 is pushed up, the phases of the first and second clutch members 2.8 are shifted (the convex part of one clutch member 2 and the concave part of the other clutch member 8 coincide), and the rocking plate The fact that the door 7 can be opened and closed in response to the swing of the door 3 is the same as in the case of the conventional door device described above.

In addition, in order to introduce pressure gas into pressure vessels such as sterile containers,
When closing the door 7, by rotating the handle 12 in the opposite direction to the above case, the male screw 1 of the 1 return shaft 13 is closed.
The nut piece 15 screwed into the nut piece 15 is rotated eight times in the right direction in FIG. 1, and the door 7, which is supported via the cam member 20, is lower it.

When the folding screen 7 is lowered, the phases of both the first and second clutch members 2.8 match, and the convex portion of one clutch member 2 and the convex portion of the other clutch member 8 coincide with each other. 3 becomes unable to swing and the door 7 remains closed, as in the case of the conventional door device described above.

Next, FIG. 3 shows an embodiment of the invention described in claim 2.

In the door device for a pressure vessel in this embodiment, a nut member 22 is fixed to the tip of the swing plate 3. The screw hole 23 of this nut member 22 faces in a direction perpendicular to the door 7 (left-right direction in FIG. 3).

A screw shaft 24 is screwed into the screw hole 23 of the nut member 22, and a truncated cone-shaped portion is provided at one end (the left end in FIG. 3) of the screw shaft 24 in a portion facing the front surface of ff1I7. The cam member 25 is fixed.

Moreover, the handle 12 is fixed to the other end of the screw shaft 24 (the right end in FIG. 3).

A truncated conical roller 27, which is an abutting member, is fixed to a bracket 26 fixed to the lower surface of the reinforcing member 19 provided on the front side of the door 7, with a horizontal axis perpendicular to 5i17. The weight of the screen 7 is supported by the rocking plate 3 via the bracket 26, roller 27, cam member 25, screw shaft 24, and nut member 22 by bringing the lower surface into contact with the upper surface of the cam member 25.

In the case of the pressure vessel door device of this embodiment configured as described above, as the screw shaft 24 is rotated by operating the handle 12, the cam member 25 fixed to the end of the screw shaft 24 is rotated. is displaced in the circumferential direction and simultaneously displaced in the axial direction (horizontal direction in FIG. 3), and a part of the cam member 25 closes the door 7
The diameter of the portion in contact with the roller 27 supported on the front surface changes, and the door 7 moves up and down.

For example, when raising the door 7 to open and close the door 7, by rotating the handle 12 in an appropriate direction, the threaded shaft 24 screwed into the nut member 22 is rotated, as shown in FIG. The door 7 is pushed up via the roller 27, the bracket 26, and the reinforcing member 19 by the cam member 25 that is moved to the right and pivotally supported at the end of the screw shaft 24. Since the contact portion between the cam member 25 and the roller 27 draws a helical locus, the reduction ratio between the handle 12 and the Jji 17 can be made sufficiently large, and the door 7 can be raised with a light force.

In addition, in order to introduce pressure gas into pressure vessels such as sterile containers,
When closing J7i17, rotate the handle 12 in the opposite direction to the above case, and the screw threaded into the nut member 22! 1idl 24 to the left in FIG.
As a result, the folding screen 7 supported by the swing plate 3 via the rollers 27, the brackets 26, and the reinforcing members 19 is lowered.

Furthermore, FIG. 4 shows an embodiment of the door device for a pressure vessel according to claim 3.

In the case of this embodiment, instead of the truncated conical cam member 25 in the embodiment shown in FIG. A cam member 28 is fixed to the end of the screw shaft 24.

The helical pitch p of this second cam member 28 and the screw! l1
Pitch P of two male screws formed on the outer peripheral surface of lI124
are the same (ρ=p). Further, the outer peripheral surface of the roller 29 supported on the front surface of the door 7 via the reinforcing member 19 (see FIG. 3) and the bracket 26 is formed into a simple cylindrical shape.

The operation of this embodiment itself is almost the same as that of the embodiment shown in FIG. Since the pitch P is the same, even if the outer circumferential surface of the roller 29 is a mere cylindrical surface, it will not be screwed! Even if the second cam member 28 is displaced in the left-right direction in FIG. 4 as the tit II 24 rotates, the second cam member 28 and the roller 29 are
Always make contact with a sufficient area.

(Effects of the Invention) The door device for a pressure vessel of the present invention is constructed and operates as described above, but all of them have a reduction mechanism having a sufficient reduction ratio in the portion that transmits the force of the handle to the door. Since it can be incorporated, it not only reduces the force required to raise the door, but also prevents the door from descending violently.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the door device for a pressure vessel according to the present invention, as set forth in claim 1. Figure 1 is a vertical sectional side view of the main part, and Figure 2 is an exploded perspective view. FIG. 3 is a vertical sectional side view of a main part showing an embodiment of the invention described in claim 2, and FIG. 4 is a longitudinal sectional side view of an embodiment of the invention described in claim 3.
FIG. 5 is a perspective view showing the overall structure of a conventional door device. front plate, 2: first clutch member, 3: rocking plate, 4: vertical shaft, 5 two guide pieces, 6: guide bin, 7: m, 8: second clutch member, 9: 1 return shaft, 10・Cam plate, 11:
Roller, 12: Handle, 13: Torsion shaft, 14: Male screw, 15: Nut piece, 16: Forked part, 17: Horizontal shaft, 18
: Roller, 19・Reinforcing member, 20: Cam member, 21・Lower edge, 22: Nut member, 23: Screw hole, 24: Screw shaft,
25: cam member, 26: bracket, 27: roller, 2
8; second cam member, 29; roller. Figure 1 Patent Applicant Chiyoda Manufacturing Co., Ltd. Manager Kinzo Koyama (one idiot) Figure Figure Figure

Claims (3)

[Claims] (1) A pair of first clutch members fixed to both sides of the opening of the pressure vessel, a rocking plate whose base end is pivotally supported on one side of the opening of the pressure vessel, and a pair of clutch members fixed to each side of the opening of the pressure vessel; A door having a width smaller than the interval and supported by the rocking plate so as to be able to rise and fall slightly, and the first clutch member fixed to both side edges of the door, which moves as the door moves up and down. a second clutch member that engages and disengages with the swing plate; a torsion shaft that is pivoted at the tip of the rocking plate in a direction perpendicular to the door and has a male screw carved into the outer peripheral surface of the portion closer to the door; A nut piece is supported at the tip of the plate so that it can move only toward and away from the door, and is screwed into the male screw. A roller is pivotally supported on the top of the nut piece by a horizontal axis parallel to the door. and a cam member fixed to the front surface of the door with its lower edge extending in the right angle direction and continuously changing in height being in contact with the roller;
Pressure vessel door device. (2) A pair of first clutch members fixed to both sides of the opening of the pressure vessel, a rocking plate whose base end is pivoted to one side of the opening of the pressure vessel, and a pair of clutch members fixed to each other. A door having a width smaller than the interval and supported by the rocking plate so as to be able to rise and fall slightly, and the first clutch member fixed to both side edges of the door and moving as the door moves up and down. a second clutch member that engages and disengages with the swing plate, a nut member fixed to the tip of the rocking plate with the screw hole facing in a direction perpendicular to the door, and a screw shaft screwed into the screw hole of the nut member. a truncated conical cam member fixed to one end of the screw shaft facing the front surface of the door; a handle fixed to the other end of the screw shaft; and a cam member fixed to the front surface of the door. A pressure vessel door device comprising an abutting member that abuts the upper surface of the pressure vessel. (3) Instead of the truncated conical cam member, a second cam member is used whose outer peripheral surface is a sloped surface whose outer diameter changes in a spiral manner;
3. The door device for a pressure vessel according to claim 2, wherein the helical pitch of the second cam member and the pitch of the male screw formed on the outer peripheral surface of the screw shaft are the same.