JPS607493B2 - autoclave sterilizer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-pressure steam sterilizer for sterilizing medical instruments and the like with high-temperature, high-pressure steam.

This type of sterilizer opens and closes the lid every time you put in or take out a sterilized item, so high-pressure steam is released to the outside each time.
Unless a sterilizer is equipped with a steam generator with a considerably larger capacity than the sterilizer, the steam pressure will drop and continuous use will be difficult.

The present invention provides a high-pressure steam sterilizer that is relatively compact, can be used continuously, and has good thermal efficiency.

That is, the sterilizer of the present invention has a pressure-resistant outer tank with a water tank formed in the inner bottom, a heater installed in the water tank of the outer tank, and a heater located above the water tank in the outer tank. A sterilization tank to be accommodated, a high-pressure steam introduction pipe that connects the outer tank and the sterilization tank, and a system that senses the steam pressure inside the sterilization tank and operates when a predetermined high pressure is reached, and allows the high-pressure steam introduction pipe to operate. A pressure regulator detects the steam pressure in the outer tank and operates at a set pressure higher than the operating pressure of the pressure regulator to open the heater passage in the water tank and reduce the set pressure. and an outer tank pressure regulator that closes the heater passage again when the heater is turned down.

The steam pressure in the high-pressure sterilizer usually requires G of 1 to 2 kg/G, and since it is necessary to provide an external outlet, a horizontal cylindrical shape with high pressure resistance is most preferable, and the shape of the outer tank is also the same as above. In order to accommodate the sterilization tank, it is convenient to have a structure having substantially the same shape and withstand pressure equal to or higher than that.

Since the sterilization tank is surrounded by the steam layer of the outer tank, the temperature inside the sterilization tank is always maintained at a high temperature, and when high-pressure steam is blown into the tank for sterilization, the temperature can be raised to the desired temperature in a very short time. In addition, since the inner part of the outer tank is also used as a water tank, if the water from the water tank comes into direct contact with the sterilization tank, the temperature of the sterilization tank will drop and the steam will become a drain, making it uneconomical. It is preferable to position the water tank slightly above the water tank. In addition, in order to restore steam pressure in a short time and enable continuous sterilization even if the sterilization tank is opened and closed frequently, sufficient steam pressure must be stored in the outer tank at all times. In order to do this, the outer tank needs to function as a steam generator and a heat storage container. It is necessary to set the temperature so that the pressure in the outer tank is 1.5 to 3 times the steam pressure of the heater. It is necessary to provide an outer tank pressure regulator with a relay for opening and closing the circuit.An embodiment of the invention will now be described with reference to the figures.

In Figures 4 to 4, ``Kawama outer box with heat insulating material 9
It houses a cylindrical outer tank 2 and a water storage tank 4 surrounded by.
The outer tank 2 has a water tank part 6 in its inner court, and a water level electrode 43 is attached to keep the water level in the water tank constant at all times, and a heater 5 is installed at a position lower than the water level electrode 43. It is mounted horizontally. Furthermore, outer tank 2
A cylindrical sterilization tank 3 is installed above the above-mentioned water tank 6 inside the tank so that its bottom is positioned slightly above the water tank 6 (see Fig. 4), and its outer lid 8 is attached to the outer box. The handle 7 of the lid stopper 19 is pivoted on the hinge 11'.
It is configured so that it can be sealed freely.

The outer tank 2 and the sterilization tank 3 are connected by a high-pressure steam introduction pipe 4', and the high-pressure steam introduction pipe 4' senses the steam pressure inside the sterilization tank 3 and is activated when a predetermined high pressure is reached. , a sterilization tank pressure regulating means for blocking the passage of the high-pressure steam introduction pipe is involved.

That is, the sterilization tank pressure regulating means consists of an electromagnetic on-off valve 23 which is interposed between the above-mentioned high-pressure steam introduction pipe 4 and is opened and closed by a glue relay 52, a timer 25 and a pressure regulator 22, and the timer 25 is operated. The middle switches 46 and 5D are closed, the switch 51 is opened, and the pressure regulator 22 is closed by the switch 4, which is normally open.
5, a switch 44 that closes, and a bellows 42 that expands and contracts under the influence of the steam pressure in the sterilization tank 3, and the bellows 42 expands and contracts when the steam reaches a predetermined high pressure.
contacts and opens the switch 45.

On the other hand, although an outer tank pressure regulator 21 is attached to the outer tank 2, the outer tank pressure regulator 21 is normally closed and has a switch 47 that forms an open path to the heater, and the influence of the steam pressure in the outer tank 2. It consists of a bellows 41 that expands and contracts in response to
When the oven reaches a set pressure (preferably 1.5 to 3 times) higher than the operating pressure of the pressure regulating means of the sterilization tank 3 mentioned above, it is extended and applied to the switch 47, which is opened to turn on the heater. When the exposure path is opened and the pressure drops below the set pressure, it contracts and separates from the switch 47, closing the heater passage again.

Furthermore, the water storage tank 4 is equipped with a condenser 33 at its inner bottom and filled with water, and is connected to the pipe 1 via an electromagnetic pump 26.
5 into the water tank part 6 of the outer tank 2 (see FIG. 5).

The electromagnetic pump 26' has a built-in relay 49, and when the water level in the water tank section 8 drops, the water level electrode 43 senses this and closes the switch 48 that excites the trust relay 49. combined.

The steam chamber formed between the outer tank 2 and the sterilization tank is connected to the upper part of the water storage tank 4 via a steam trap 39 and a pipe 16. A pipe 17 is connected to a capacitor 33 wound in a water storage tank 4 through a steam trap 40 attached to the electromagnetic valve 2 which opens and closes and a bypass circuit.

And the above-mentioned relay 53 is the switch 5 of the timer 26.
When the set time of the timer 25 expires and the switch 51 is closed, it is energized and opens the solenoid valve 24.
0 is configured to open when air flows out and close it when steam attempts to flow out.

Furthermore, in the figure, 12 is the rubber leg of the outer box 1, 13 is the water tank stand, 2
8 is the start switch, 31 is the pressure gauge of outer tank 2.
is the pressure gauge of the sterilization tank 3, 34 is the water level gauge, 35 is the power indicator light, 36 is the power switch, 37 is the sterilization indicator light, 38 is the end light, and 55 and 56 are the safety valves, respectively.

Next, the operation of the present invention constructed as described above will be explained.

First, when the power switch 36 is closed, the power indicator light 35
lights up and says, ``At the same time, heater 5 is energized.''

The water in the water tank section 8 at the inner bottom of the outer tank is also heated and gradually vaporized. The air in the outer tank 2 is forced out of the steam trap 39 by the generated steam and released into the atmosphere through the pipe 16 that closes inside the water storage tank 4.

This steam trap 39 is automatically closed when the air is completely expelled. When the steam pressure in the outer tank 2 reaches the specified pressure (2 to 4 kg crucian carp G), the bellows 41 in the turtle of the outer tank pressure regulator 2 operates,
When the switch 47 is contacted, the switch 47 is opened, and the power supply to the heater 5 is stopped.

In this way, the pressure in the outer tank 2 is always kept constant. Furthermore, when the water level of the water tank 6 for steam generation housed in the lower part of the outer tank 2 falls below the water level electrode 43, the switch base of the water level regulator 27 is opened, the relay 49 is activated, and the electromagnetic pump 26 is activated. The water tank 4 is automatically supplied with water, and the water level in the tank 6 is maintained at a constant level.

This completes the preparation for sterilization of the sterilizer.

Next, to use the sterilizer, first place the items to be sterilized into the sterilization tank 3.
and the lid 8 is sealed. When the timer 26 is set and the start switch 28 is closed, "switch 45,
46 and 50 are closed, the relay 52 is energized and the solenoid valve 23 is opened to allow the high pressure steam in the outer tank 2 to flow into the sterilization tank 3 through the high pressure steam introduction pipe 14, and at the same time, the inside of the sterilization tank 3 is The remaining air in the sterilization tank 3 is discharged into the water tank 4 through the steam trap 40 through the pipe 17'' and the condenser 33. When the residual air in the sterilization tank 3 is completely released and steam starts to flow out of the steam trap 40, the steam trap After that, the pressure inside the sterilization tank 3 gradually increases and when it reaches a predetermined pressure, the bellows 42 of the pressure regulator 22 extends and hits the switch 45 to open the switch 45. When the switch 45 is opened, the relay 52 is demagnetized, the solenoid valve 23 is closed, and the introduction of steam is stopped.

At this time, the switch 44 interlocked with the switch 45 is simultaneously closed, and the sterilization indicator light 37 lights up to indicate that the box is being reduced.

When the predetermined time has elapsed, the timer cape 25 is turned off and the switch 6 is turned off.
1 is closed and switch 60 is opened. By closing the switch 51, a hazy path of the relay 53 is formed, which closes the solenoid valve 2 and sends the high-pressure steam in the sterilization tank 3 to the condenser 33 via the pipe 7, where it is cooled and condensed while being stored. Tank 4
reflux. At the same time, the completion indicator light 38 lights up to indicate the end of the sterilization operation. After confirming the pressure reduction in the sterilization tank 3 with the pressure gauge 32, open the lid 8 and take out the objects to be sterilized. One cycle of operation is completed, but
At that time, the pressure in the outer tank 2 was already maintained at the specified pressure,
Preparations for the next sterilization operation have been completed and the machine is ready for continuous sterilization operations. The sterilizer of the present invention has the above-mentioned configuration, and the sterilization tank is housed in the outer tank, which has a water tank section with a built-in heater in the inner bottom, so that the temperature inside the sterilization tank is always maintained at a high temperature. Furthermore, the steam pressure in the outer tank is sensed, and the sterilization tank pressure regulating means operates at a set pressure higher than the operating pressure, opens the electric circuit of the heater in the water tank, and when the pressure drops below the above set pressure, the Because it has an outer tank pressure regulator that closes the heater passage, the steam pressure in the sterilization chamber can be reached to the specified pressure in a very short time when sterilization work is repeated. First, it has extremely practical value as continuous sterilization is possible.

[Brief explanation of drawings]

Fig. 1 is a partial cross-sectional plan view of the device of the present invention, Fig. 2 is a vertical cross-sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a front view to Fig. 4 is a longitudinal cross-sectional view taken along the line B-B in Fig. 2. The top view and FIG. 5 are explanatory diagrams showing the arrangement of the present invention. 1... Outer box, 2... Outer tank, 3...
Sterilization tank, 4... Water tank, 5... Heater also 6...
... Water tank section, 8 ... Diamond, 14 ... High pressure steam introduction pipe, 21 ... Outer tank pressure regulator L 2
2... Sterilization tank pressure regulator, 23, 24... Solenoid valve, 25... Timer, 26... Solenoid pump, 39
,40...Steam trap. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A pressure-resistant outer tank with a water tank formed in the inner bottom, a heater installed in the water tank of the outer tank, a sterilization tank located above the water tank in the outer tank, and an outer tank. A high-pressure steam introduction pipe that communicates between the tank and the sterilization tank, and a sterilization tank pressure regulating means that senses the steam pressure in the sterilization tank and operates when a predetermined high pressure is reached to cut off communication between the high-pressure steam introduction pipe. and detects the steam pressure in the outer tank, operates at a set pressure higher than the operating pressure of the sterilization tank pressure regulating means, opens the electric circuit of the heater in the water tank, and when the pressure drops below the set pressure, A high-pressure steam sterilizer comprising an outer tank pressure regulator that closes the electric circuit of the heater again.