JPH0247828Y2 - - Google Patents

Description

[Detailed description of the invention] a. Purpose of the invention (industrial application field) The compressed air-driven on-off valve according to this invention is installed in hospitals and used to sterilize patient's clothes, surgical tools, etc. It can be attached to a steam sterilizer to automatically control the supply and discharge of sterilization steam into a sterilization container.

(Prior Art) The above-mentioned steam sterilizer is equipped with a steam pipe for sending high-temperature steam into the sterilization container or discharging steam from the sterilization container. A valve is provided in the middle of the pipe to control the supply and discharge of steam. Steam sterilizers using such valves are required to have a structure in which the steam control valve can be automatically opened and closed, as sterilization work has been automated in recent years.

For this reason, conventionally, as shown in FIG. 5, a compressed air-driven on-off valve is used, which opens and closes a steam flow path by raising and lowering a valve plate 3 by supplying and discharging compressed air into an actuator 2 having a diaphragm 1. was.

(Problems to be solved by the invention) However, in the conventional compressed air-driven on-off valve that is configured and operates as described above, there is a possibility that the compressed air source may malfunction, or the solenoid valve for supplying and discharging compressed air may malfunction. If compressed air cannot be supplied into the actuator due to a failure or the like, the valve plate 3 cannot be moved and the valve cannot be opened or closed at all.

For this reason, for example, if an on-off valve is installed in the middle of the steam exhaust pipe of a steam sterilizer, the high-temperature, high-pressure steam inside the sterilizer cannot be discharged, and the internal temperature and pressure inside the sterilizer will naturally drop. It becomes impossible to take out the items to be sterilized. Not only does it take a long time for the temperature inside the insulated sterilizer to drop, but the objects to be sterilized become wet due to steam condensation as the temperature drops, making it impossible to use the objects as they are.

The compressed air-driven on-off valve of the present invention eliminates these inconveniences.

b. Structure of the invention (means for solving the problem) The compressed air-driven on-off valve of the present invention, like the conventional on-off valve, uses the pressure of compressed air to cause the piston or diaphragm installed in the pressure case to respond to the elasticity of a compression spring. A rod is fixed to the piston or diaphragm of the actuator that is moved against the piston, and the movement of the rod drives the valve body that opens and closes the flow path.

The compressed air-driven on-off valve of the present invention is characterized by having one end of the rod for driving the valve body protrude outside the pressure case from a through hole provided in the end face of the pressure case that constitutes the actuator. A drawer piece having a convex portion on the surface facing the end surface of the case is pivotally attached to the end of the rod protruding outside the case so as to be freely rotatable about the rod, and a drawer piece is pivotally attached to the end surface of the case opposite to the convex portion. , in that the convex portion forms a recess into which it can freely enter. On the surface opposite to the convex part of this pull-out piece, a finger hook is provided as necessary so that the end of the rod can be pulled out of the pressure case against the elasticity of the compression spring that tries to pull the rod into the pressure case. It is set up.

(Function) In the case of the compressed air-driven on-off valve of the present invention configured as described above, the convex portion of the pull-out piece is normally inserted into the groove on the end face of the case. As a result, the rod with the pull-out piece pivotally attached to one end is moved by supplying and discharging compressed air into the pressure case, as in the case of a conventional on-off valve, and drives the valve body to open and close.

Next, if compressed air cannot be supplied into the pressure case due to a malfunction in the compressed air source, etc., and the valve body remains closed due to the elasticity of the compression spring, your finger may be pulled against the finger hook on the end surface of the drawer piece. Then, pull out the rod with the drawer piece pivotally attached to the end out of the case. Once the convex part of the drawer piece has completely come out of the groove on the end face of the case, rotate the drawer piece a little around the rod. As a result, the end of the rod remains pulled out of the pressure case against the elasticity of the compression spring, and the valve body is maintained in the open state.

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

FIG. 1 shows a first embodiment of the invention. A partition wall 7 is provided inside the tubular valve housing 6, which has an inlet 4 at one end and an outlet 5 at the other end, and partitions the two ports 4, 5 from each other. This partition wall 7 is provided with a horizontal opening 8, and a packing 9 is attached to the periphery of this opening 8. A cylindrical portion 10 is formed above the opening 8, and an actuator 12 is fixed to the upper surface of a lid 11 that is attached to the upper opening of the cylindrical portion 10. This actuator 12
1, a piston 14 with the middle part of a rod 13 connected to the center is slidably fitted inside a cylinder tube 15. A compression spring 17 provided therebetween provides downward elasticity. An air supply port 18 for feeding compressed air to the lower side of the piston 14 is provided on the lower side surface of the cylinder tube 15 constituting the actuator 12 . A valve plate 3 is provided at the lower end of the rod 13, which is connected at its intermediate portion to the center of the piston 14 and passes through the lid 11 in an airtight manner, to face the packing 9 at the peripheral edge of the opening of the partition wall. In addition, in FIG. 1, 19 is a filter provided in a portion of the valve housing 6 closer to the inlet 4 than the partition wall 7.

Further, the upper end of the rod 13 is connected to the cylinder tube 15.
It penetrates through the center of the lid plate 16 attached to the upper end opening and protrudes from the upper surface of the lid plate 16. A drawer piece 20 as shown in FIG. 2 is pivotally attached to the upper end of the rod 13 projecting from the upper surface of the cover plate 16 so as to be rotatable about the rod 13. A convex portion 21 extending in the diametrical direction is formed on the lower surface of the drawer piece 20. On the other hand, on the upper surface of the cover plate 16 at the upper end of the actuator, which faces the protrusion 21, a groove 22 is formed into which the protrusion 21 can freely enter.
Further, on the top surface of the drawer piece 20, the drawer piece 2
A finger hook 23 is attached to the rod 13 to serve as a handhold when pulling up the rod 13 against the elasticity of the compression spring 17 that attempts to pull it into the actuator.

The compressed air-driven on-off valve of the present invention configured as described above normally aligns the convex portion 21 on the lower surface of the drawer piece 20 with the groove 22 on the upper surface of the cover plate 16, as shown in FIG. , the convex portion 21 is kept in a state where it can freely enter into the groove 22. As a result, rod 13
can be freely lowered until the lower surface of the valve plate 3 comes into contact with the packing 9, and the piston 1 is moved through the air supply port 18.
Valve plate 3 by supplying and discharging compressed air to the lower side of 4
The communication between the inlet 4 and the outlet 5 can be controlled by raising and lowering the .

Next, if compressed air cannot be supplied to the lower side of the piston 14 due to a failure, the piston 14
is lowered by the elasticity of the compression spring 17, and the valve plate 3 remains closed. Therefore, hook the finger on the finger hook 23 on the top surface of the drawer piece and pull the drawer piece 20 against the elasticity of the compression spring 17. pull upwards. As a result, the valve plate 3, which is connected to the pull-out piece 20 via the rod 13, is separated from the packing 9, and the inlet 4 and outlet 5 communicate with each other. Pull out the drawer piece 2 until the protrusion 21 on the lower surface of the drawer piece completely comes out of the groove 22 on the upper surface of the lid plate.
0 is raised, the drawer piece 20 is slightly rotated around the rod 13. This results in
The convex portion 21 comes into contact with a portion of the upper surface of the lid plate 16 that is out of the groove 22, and even if the puller piece 20 is removed, the valve remains open. There is a drawer piece 2 between the drawer piece 20 and the rod 13.
In order to prevent the valve from rotating inadvertently and becoming unable to close the valve, a ratchet mechanism is provided or the convex part 21 is configured to come out of the concave groove 22 only when the drawer piece is pulled.

In the embodiment shown in FIG. 1, a structure is shown in which the rod 13 with the valve plate 3 fixed to the lower end is raised and lowered by a piston type actuator.
The compressed air-driven on-off valve of the present invention is not limited to such a structure, but can also be applied to a valve that is opened and closed by a diaphragm-type actuator as shown in FIG.

Further, the structure of the valve itself is not limited to the globe valve as shown in FIGS. 1 and 5, and the present invention can also be applied to a ball valve. However, in the case of a ball valve, the valve body must be rotated in order to open and close the valve, and a mechanism is required to convert the linear motion of the actuator into rotational motion. Therefore, in the second embodiment shown in FIGS. 3 and 4,
The compressed air driven on-off valve is constructed by arranging a ball valve main body 24 and an actuator 25 in parallel with each other. The actuator 25 has a piston body 27 slidably inserted inside a cylindrical cylinder 26, and in the illustrated example,
The piston body 27 has a structure in which a first piston plate 29 is fixed to one end of a single rod 28, and a second piston plate 30 is fixed to the intermediate part, and the other end of the rod 28 is fixed to one end opening of the cylinder tube 26. It passes through the center hole 32 of the screwed first lid 31 and projects to the outside of the first lid 31. First lid body 31
A compression spring 17 is provided between the and the second piston plate 30.
is provided to impart elasticity to the piston body 27 toward the right in FIG. A second lid 33 is screwed onto the other end opening of the cylinder tube 26, and this second lid 33 is provided with an air supply port 18 for compressed air.
Compressed air can be supplied and discharged into the space 34 between the second lid 33 and the first piston plate 29.

First and second piston plates 29, 3 of rod 28
The tip of the branch rod 35 whose base end is fixed to the part between
It protrudes to the outside of this cylinder tube 26 through the cylinder tube 26.

On the other hand, the ball valve main body 24 has an end of a valve shaft 38 protruding outside the casing 37 in order to rotate a valve body rotatably and slidably housed in the casing 37. The base end portion of the arm body 39 is fixed to the portion. The tip of this arm body 39 is a forked portion 40, and the tip of the branch rod 35 that protrudes outside the cylinder tube is engaged with this forked portion 40.

Further, at the end of the rod 28 that penetrates the center hole 32 of the first lid 31 and protrudes outside this lid 31,
A drawer piece 20 similar to that of the first embodiment described above is pivotally attached, and a groove 22 is formed on the outer surface of the lid body 31.

In the ball valve type compressed air driven on-off valve constructed in this manner, when compressed air is not supplied into the space 34, the rod 28 is moved to the right end in FIG. 3 due to the elasticity of the compression spring 13. The valve shaft 38 of the ball valve main body 24 is rotated clockwise in FIG. 4 to keep the flow path in the ball valve main body 24 open (or closed). . Furthermore, when compressed air is supplied into the space 34, the piston body 27 moves to the left end in FIG. 3 against the elasticity of the compression spring 17, and the valve shaft 38 of the ball valve main body 24 moves backward in FIG. By rotating clockwise, the flow path within this ball valve main body 24 is closed (or opened).

If compressed air cannot be supplied into the space 34 due to a failure of the compressed air source that supplies the compressed air into the space 34, the piston body can be removed by pulling the drawer piece 20 to the left in FIG. 27 is the compression spring 17
The ball valve main body 24 can be opened (or closed) by moving it against the elastic force of the ball valve main body 24.

Note that in order to convert the linear motion of the actuator 25 into rotational motion and rotationally drive the valve shaft 38 of the ball valve main body 24, it is possible to use a combination of a rack and a pinion in addition to the structure shown in FIGS. 3 and 4. You can also do that. That is, from the long hole 36 to the cylinder tube 26
If a rack is fixed to the end of the branch rod 35 protruding outward and a pinion fixed to the end of the valve shaft 38 of the ball valve main body 24 is engaged with this rack, compressed air can be supplied and discharged into the actuator 25. The flow path within the ball valve main body 24 can be opened and closed.

c. Effects of the invention Since the compressed air-driven on-off valve of the present invention is configured and operates as described above, even if it becomes impossible to supply compressed air for driving, it is possible to manually switch the compressed air. It is possible to prevent a device equipped with an air-driven on-off valve from completely losing its function.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of the first embodiment of the compressed air driven on-off valve of the present invention, Fig. 2 is a perspective view of the rod end, Fig. 3 is a partial sectional view showing the second embodiment, and Fig. 4
The figure is a sectional view taken along the line AA in FIG. 3, and FIG. 5 is a sectional view similar to FIG. 1, showing a conventional on-off valve. 1: Diaphragm, 2: Actuator, 3:
Valve plate, 4: Inlet, 5: Outlet, 6: Valve housing, 7: Partition wall, 8: Opening, 9: Packing, 10: Cylindrical part,
11: Lid body, 12: Actuator, 13: Rod, 14: Piston, 15: Cylinder tube, 16:
Lid plate, 17: Compression spring, 18: Air supply port, 19: Filter, 20: Drawer piece, 21: Convex portion, 22: Concave groove, 23: Finger hook, 24: Ball valve main body, 25:
Actuator, 26: cylinder tube, 27: piston body, 28: rod, 29: first piston plate, 30: second piston plate, 31: first lid body, 32: center hole, 33: second Lid body, 34: Space, 35: Branch rod, 36: Long hole, 37: Casing, 38: Valve shaft, 39: Arm body, 40: Forked part.

Claims (1)

[Scope of utility model registration request] An actuator for moving a rod connected to a piston or a diaphragm by supplying compressed air against a spring having elasticity in a direction to draw an end protruding from a through hole of a pressure case into the pressure case; In a compressed air-driven on-off valve having a valve body driven by the movement of a rod, a pull-out piece is provided at the end of the rod that protrudes outside the pressure case, and a convex portion is formed on the surface facing the pressure case. The compressed air driven on-off valve is characterized in that the pressure case is rotatably pivoted around the rod, and a recess into which the projection can freely enter is formed on a surface of the outer surface of the pressure case that faces the projection. .