JPH0313591Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (industrial application field) This invention is used in steam sterilizers when the air and steam inside the container is exhausted by a vacuum pump to create a negative pressure inside the sterilizer. This invention can be used in air leak valves used to draw a small amount of air into a vacuum pump to prevent cavitation.

(Prior Art) Steam sterilizers are widely used, for example, in hospitals to sterilize surgical instruments, clothing, and the like.
The general structure of the steam sterilizer is shown in FIG. That is, a can body 2 with a lid 1 is provided with a steam jacket 3, and a valve 4 is opened to supply steam from a steam source 6 through a pipe 5 to preheat the inside of the can. Steam is supplied into the can through the The condensed water formed in the jacket is discharged by pipe 7 through trap 8 to outlet 9. The steam fed into the can heats the object to be sterilized, and the resulting condensed water is discharged from the pipe 10 through the trap 11 and check valve 12 to the outlet 9.

When the steam sterilizer is finished, the valve 4 is closed to stop the steam supply, the valve 13 is opened, and the steam inside the can is discharged to the outlet 9 via the check valve 12. Close the valve 14, open the vacuum pump 15, and operate the vacuum pump 15.
The inside of the can is evacuated through the check valve 16 to a low pressure close to vacuum, and the object to be sterilized is dried.

At this time, if the degree of vacuum inside the can becomes higher than necessary, cavitation will occur in the vacuum pump 15, increasing vibration and noise, and damaging the vacuum pump.
A check valve 18 and a throttle valve 19 are provided with a pipe 17 leading to the
A small amount of air is always sucked into the vacuum pump through the air leak valve.

The check valve 18 of the air leak valve attached to the vacuum pump 15 has a structure in which a normally used ball is pressed against the valve seat by a spring because the amount of airflow is extremely small. Since this is inappropriate, we use a structure in which a light valve piece that can move freely without being restrained by a spring is attached to and detached from the valve seat.

The air leak valve consisting of the check valve 18 and the throttle valve 19 has conventionally been constructed as shown in FIG.

In FIG. 6, the check valve 18 includes a valve seat piece 2 that loosely incorporates a valve piece 20 made of a light elastic material such as rubber.
The cylindrical chamber 21a of No. 1 is screwed onto the valve body 22 of the throttle valve 19, and the atmosphere is allowed to enter the internal space of the valve body 22 through the through hole 23 of the valve seat piece 21 and the through hole 24 of the valve body. . The valve piece 20 has a shaft rod 20a formed protruding from the front surface thereof, which is loosely fitted into a through hole 23 to guide the valve piece 20 so as not to tilt significantly, and a protrusion 20b formed protrudingly from the center of the rear surface of the valve piece 20. Thus, the valve piece 20 is prevented from contacting the valve body 22 with its entire rear surface.

The throttle valve 19 is constructed by inserting the conical tip of the valve stem 25 that is screwed into the valve body 22 into the outlet hole 26, adjusting the degree of throttle depending on the insertion amount, and tightening the lock nut 27 to set the adjusted position. It is designed to be fixed.

(Problems to be Solved by the Invention) In the conventional check valve of the air leak valve for a steam sterilizer configured as described above, as shown in FIG. There was a possibility that the air suction through the pipe 17 would become unreliable.

B. Structure of the invention (means for solving problems) The air leak valve of this invention has the through hole 24 communicating with the throttle valve 19 opened at a position outside the range where the protrusion 20b of the valve piece 20 contacts. Through hole 24
check valve 18 so that it is not blocked by protrusion 20b.
It is composed of

(Function) The valve piece 20 moves within the cylindrical chamber 21a of the valve seat piece 21 to open and close the through hole 23, but at this time, the protrusion 2
Even if 0b comes into contact with the valve body 22, the through hole 24 will not close to the protrusion 20.
Because of b, the check valve 18 is not blocked and can always operate smoothly.

(Embodiment) Figs. 1 and 2 show a first embodiment of the air leak valve of the present invention, in which Fig. 1 is a cross-sectional view taken from - - in Fig. 2, and Fig. 2 is a - cross-sectional view - shown in Fig. 1. The through hole 24 is eccentric to the cylindrical chamber 21a of the valve seat piece 21 and bored outside the protrusion 20b, so even if the valve piece 20 moves to the right and the protrusion 20b comes into contact with the valve body 22, the through hole will remain intact. 24
will not be blocked.

3 (cross-sectional view - - in FIG. 4) and FIG. 4 (cross-sectional view - - in FIG. 3) show a second embodiment of the present invention, in which a protrusion eccentrically relative to the cylindrical chamber 21a of the valve seat piece 21 is shown. Two through holes 24, 24 that are removed from the valve body 20b are bored, and similarly the through holes 24, 24 are not blocked by the protrusion 20b, and the contact state of the protrusion 20b against the valve body 22 is stabilized. .

C. Effect of the invention The valve piece 20 moves within the cylindrical chamber 21a of the valve seat piece 21 to open the through hole 23 and allow outside air to flow from the air hole 24 to the throttle valve 19, or closes the through hole 23 to operate the vacuum pump. When the jacket 3 is stopped, the steam passing through the jacket 3 is prevented from leaking through the vacuum pump 15 and the throttle valve 19, but when the through hole 23 is opened, the protrusion 20b does not block the through hole 24. from,
The check valve 18 can always operate smoothly.

[Brief explanation of the drawing]

Figures 1 to 4 show two embodiments of the air leak valve of the present invention, and Figure 1 is the second embodiment of the first embodiment.
A cross-sectional view, Figure 2 is a cross-sectional view of Figure 1, and Figure 3 is a cross-sectional view of Figure 1.
The figure is a sectional view of the second embodiment in Fig. 4, Fig. 4 is a sectional view of Fig. 3, Fig. 5 is a schematic diagram showing the outline of the structure of the steam sterilizer, and Fig. 6 is a conventional air leak valve. FIG. 7 is a vertical cross-sectional view of the check valve portion showing its operating condition. 1: Lid, 2: Can body, 3: Steam jacket, 4:
Valve, 5: Pipe, 6: Steam source, 7: Pipe, 8: Trap, 9: Outlet, 10: Pipe, 11: Trap, 1
2: Check valve, 13, 14: Valve, 15: Vacuum pump, 16: Check valve, 17: Pipe, 18: Check valve, 1
9: Throttle valve, 20: Valve piece, 20a: Shaft rod, 20
b: Protrusion, 21: Valve seat piece, 21a: Cylindrical chamber, 2
2: Valve body, 23, 24: Through hole, 25: Valve stem, 2
6: Exit hole, 27: Lock nut.

Claims (1)

[Scope of utility model registration request] Screw the valve seat piece 21 onto the valve body 22 of the throttle valve 19,
A lightweight valve piece 20 is loosely fitted into a cylindrical chamber 21a formed within the valve seat piece 21, a shaft rod 20a is provided protrudingly on the surface of the valve piece 20 that will become a valve, and a protrusion 20b is provided on the opposite surface. In the check valve 18, which has a protruding shaft 20a and is loosely inserted into the through hole 23 of the valve seat piece 21, the through hole 24 that communicates the cylindrical chamber 21a and the throttle valve 19 is inserted into the protrusion 20b when the valve piece 20 moves. An air leak valve with a check valve for steam sterilizers, which is bored in a position where it will not be blocked.