JPH0347649Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial field The present invention relates to a high-pressure steam sterilizer that sterilizes objects to be sterilized by bringing the inside of the chamber to saturated steam pressure.

(b) Conventional technology High-pressure steam sterilizers need to bring the inside of the chamber to saturated steam pressure.
As in the publication, an automatic valve is installed in a part of the pipe that communicates between the inside and outside of the chamber. This automatic valve is configured to open until the inside of the chamber reaches a saturated vapor pressure, allowing the air in the chamber to flow out, and close when the saturated vapor pressure is reached and the temperature of the steam flowing out of the pipe rises.

However, the automatic valve has a steam temperature of 10℃.
It is preferable to close the device when the temperature reaches
Even if the temperature is set to ℃, the temperature may exceed 100℃ due to variations)
It may reach operating temperature and remain open continuously. For this reason, steam temperatures below 100°C (approximately 90°C
°C) and shuts down.

However, when the automatic valve performs the sterilization operation again in a hot state due to continuous use, the automatic valve quickly reaches 90°C and closes, even though the chamber has not yet reached full saturated vapor pressure, causing an inconvenience. This resulted in the drawback that sufficient sterilization was not possible.

(c) Problems to be solved by the invention The purpose of the invention is to create a saturated vapor pressure sufficient for sterilization within the chamber.

(d) Means for solving the problem The present invention provides an on-off valve at an appropriate location on the outlet pipe that communicates with the inside of the chamber, and this on-off valve allows the temperature sensor to reach close to 100°C while the temperature inside the chamber is rising. It is configured to remain open until a certain temperature is reached, and then close after a predetermined period of time after detecting this certain temperature.

(e) Effect This invention is designed to operate a counter when the temperature detector detects approximately 98°C while the temperature inside the chamber is rising after the start of sterilization.The counter starts and the valve opens and closes after a predetermined period of time when the air remaining in the chamber has sufficiently flowed out. Close the chamber and bring the inside of the chamber to saturated steam pressure to perform sterilization.

(f) Examples Examples of the present invention will be explained based on the drawings. First, FIG. 1 will be explained. (1) is a low cylindrical chamber with an opening 2 at the top, (3) is a heater fixed to the inner bottom of this chamber, (4) is a lid that seals the opening 2, and (5) is A lead-out pipe having one end connected to the chamber 1 and the other end opening outward communicates the inside of the chamber 1 with outside air. Reference numeral (6) denotes an on-off valve provided at a suitable location on the outlet pipe 5 relatively close to the chamber 1. This valve is normally open and is closed when the solenoid coil 7 is energized.

(8) is a temperature detector consisting of a thermistor fixed to the side wall of the chamber 1 and facing into the chamber; (9) is a drainage container having an opening at the other end of the lead-out pipe 5; This is a mounting table for objects to be sterilized placed above the heater 3.

Next, the block diagram shown in FIG. 2 will be explained. Reference numeral 11 denotes a microcomputer, which compares the level of the signal from the temperature detector 8 that detects the temperature inside the chamber 1 with a preset level, turns on or off the heater 3, and also performs various functions necessary for sterilization operations. Programming the process. 12 is an A/D conversion circuit for digitally exchanging the resistance value change by the temperature detector 8; 13 is a start switch for starting the sterilization operation; 14 is a sterilization timer switch for setting the sterilization time; 15 is a heater for the heater 3. A drive circuit 16 is a valve drive circuit for the on-off valve 6.

Next, we will discuss the operation. When performing sterilization, water and objects to be sterilized are stored in the chamber, and the opening 2 is sealed with a lid 4.

In this state, when the time of the sterilization timer switch 14 is set according to the amount and type of the object to be sterilized and the start switch 13 is pressed, the microcomputer 11 is started based on the signal of the sterilization timer switch 14 and the signal of the start switch 13. It calculates and energizes the heater 3 to heat the water. Steam is gradually generated in the chamber 1 due to this heating, and the air in the chamber 1 flows out into the drainage container 9 through the outlet pipe 5.

Eventually, when the temperature inside the chamber 1 reaches a constant temperature close to 100°C (approximately 90°C), the resistance value of the temperature detector 8 that detects this temperature changes rapidly, and the output of the A/D conversion circuit 12 changes. It is inverted and input to the microcomputer 11. From the moment this input is received, the microcomputer 11 starts a built-in counter. During this counting, the heater 3 is continuously generating heat, and since the inside of the chamber is unsaturated, the remaining air will follow and flow out.

When the counter finishes counting a predetermined time (90 seconds) from the start time, the solenoid is energized by the output of the microcomputer 11 to close the on-off valve 6. In this section, all or most of the residual air in the chamber 1 flows out and reaches a saturated vapor pressure, so that sufficient sterilization can be performed.

When the time set by the sterilization timer switch 14 ends, the heater 3 is turned off to complete the sterilization.

In addition, in this invention, after the temperature detector detects 98℃,
The on-off valve was closed after a delay of 90 seconds, but this time is set by, for example, the mounting position of the temperature sensor.

(G) Effect of the invention This invention opens the on-off valve until the temperature detector detects a constant temperature close to 100°C, and closes the on-off valve after a predetermined time after detecting a constant temperature close to 100°C. Therefore, accurate sterilization operation can be performed. In other words, the on-off valve can be closed when the inside of the chamber reaches saturated vapor pressure, and even though air remains in the chamber due to variations in the on-off valve as in the past, the on-off valve closes. There is no drawback that the on-off valve may open continuously even though it is closed or reaches saturated vapor pressure.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the high-pressure steam sterilizer of the present invention, and FIG. 2 is a block diagram of the same. 1...chamber, 3...heater, 4...lid, 5...
Output pipe, 6...opening/closing valve, 8...temperature detector.

Claims (1)

[Scope of claim for utility model registration] A chamber containing water and objects to be sterilized and sealed with a lid, a heater fixed within the chamber,
A lead-out pipe having one end connected to the inside of the chamber and the other end led out to the outside of the chamber, an on-off valve provided at an appropriate position of the pipe, and a temperature detector for detecting the temperature inside the chamber are provided. In a device that performs sterilization using saturated steam pressure, the on-off valve is configured such that the temperature sensor detects 100% during the temperature rise.
A high-pressure steam sterilizer is characterized in that it is opened until a constant temperature close to ℃ is detected, and is closed after a predetermined time after detecting this constant temperature.