CN1830491A - Hydrogen peroxide filling system of plasma sterilization device - Google Patents

Abstract

A hydrogen peroxide filling system for the plasma sterilizer is composed of supporting frame, liquid storage tank, evaporator with nozzle, delivering pipeline between said liquid storage tank, and the high-precision metering pump with step motor, which is installed to said delivering pipeline.

Description

Plasma sterilizer hydrogen peroxide filling system

technical field

The invention relates to a hydrogen peroxide filling system for a plasma sterilizing device, which is used for filling hydrogen peroxide into the plasma sterilizing device.

Background technique

Disinfection and sterilization is an important part of sanitation and disease prevention, and it is also an important part of implementing the principle of prevention first. Especially in the control of infectious diseases, disinfection and sterilization have become one of the key means to cut off the transmission route. Since Menashi first used argon plasma to kill bacteria on the surface of glass bottles in 1968, the sterilization and disinfection technology using ionized gas-plasma is constantly replacing conventional technology, widely used in various industries, and has shown great advantages.

Plasma sterilization technology is a new physical sterilization technology that has emerged in the field of disinfection in recent years. With the development of medical and biological high-tech, the existing sterilization technology can no longer meet some special needs. Some precision medical instruments that are not resistant to high temperatures, such as fiber speculum and other heat-resistant materials, require low-temperature sterilization technology. Plasma sterilization technology is another new low-temperature sterilization technology after methane, ethylene oxide, glutaraldehyde and other sterilization technologies. Plasma sterilization technology overcomes the long-time and toxic characteristics of the above methods, and adds a new low-temperature sterilization method for medical devices.

Plasma refers to the state of matter in which energy is continuously applied to matter from the outside to dissociate it into negatively charged and positively charged particles. According to the order of energy levels, the states of matter are solid, liquid, gas, and plasma, so plasma is customarily called the fourth state. In addition to existing in nature, plasma can also be obtained artificially. Usually an electric field is applied to the gas to accelerate the charged particles. Since ions are heavier, all that are accelerated are electrons. Ionization is caused by electrons colliding with heavier particles, eventually forming a plasma.

In the above-mentioned low-temperature plasma disinfection system, some devices for supplying hydrogen peroxide adopt a cartridge system, which contains a certain amount of hydrogen peroxide solution. The hydrogen peroxide solution contained therein is delivered to the solution delivery pipe by a syringe pump, and the liquid hydrogen peroxide solution sent in is vaporized by the evaporator, and then sent into the sterilization chamber, but this system is very complicated and expensive. In addition, some use liquid level detection technology to control the injected liquid capacity, but the disadvantage is that the accuracy is poor.

Hydrogen peroxide gas is injected into the sterilization chamber to diffuse and penetrate the surface of the sterilized object. The concentration of hydrogen peroxide is generally 0.05 to 10 mg/liter. When hydrogen peroxide is injected at a suitable concentration, an auxiliary gas such as oxygen, nitrogen, argon or similar can be added to the reaction chamber. Therefore, if the optimal energy is applied, the best effect of sterilization can be obtained. Since the volume of each injection is only about 2mL, the injection of hydrogen peroxide is required to be accurate, with a minimum accuracy of 0.05mL. Accurate addition is not easy.

Contents of the invention

The object of the present invention is to provide a hydrogen peroxide filling system for a plasma sterilizing device that is simple in structure, low in price, high in accuracy, and convenient for popularization and application.

The hydrogen peroxide filling system of the plasma sterilization device according to the present invention includes a bracket, a liquid storage tank, a vaporizer and a delivery pipeline, the liquid storage tank and the vaporizer are connected by a delivery pipeline, and a gas nozzle is connected to the vaporizer. A high-precision metering pump is connected to the delivery pipeline, and a stepping motor is installed with the metering pump.

The invention is simple in structure, low in price, easy to popularize and apply, and is supplied by a high-precision metering pump with high precision.

A semiconductor refrigerator is installed at the bottom of the liquid storage tank to keep hydrogen peroxide in a lower temperature environment. On the one hand, it can ensure the performance of hydrogen peroxide itself, and on the other hand, it can avoid the volatilization of hydrogen peroxide with strong oxidation and high volatility. Protect the environment, safe and reliable.

The vaporizer is designed as an electric heating vaporizer with simple structure and easy automatic control.

A corresponding packaging bottle piercer is added on the liquid storage tank to facilitate the addition of hydrogen peroxide.

A control solenoid valve is set between the vaporizer and the gas nozzle, which is beneficial to realize automatic control. The vaporizer preferably includes two stages, the solenoid valve is arranged on the connecting pipeline between the two-stage vaporizers, and the gas nozzle is connected to the second stage vaporizer. Install a thermometer in the vaporizer, such as a thermocouple, etc., and cooperate with a temperature relay to control the temperature at the vaporization temperature of the hydrogen peroxide liquid.

Equipped with a liquid level probe in the liquid storage tank, it is convenient to monitor the residual hydrogen peroxide liquid, and remind the user to add hydrogen peroxide liquid in time to avoid sterilization failure.

In the present invention, the vaporizer, the liquid level probe, the high-precision metering pump, the stepper motor and the semiconductor refrigerator etc. all have commercially available products, which can be directly purchased and used. Equipped with an automatic control device, it can realize automatic filling.

The invention can automatically supply a very small fixed amount of hydrogen peroxide solution to the sterilization chamber. After the hydrogen peroxide solution fills the liquid storage tank first, the semiconductor refrigerator can keep the liquid storage tank at a certain temperature to reduce or reduce the volatilization of the hydrogen peroxide liquid, and the liquid level probe monitors the remaining amount of the hydrogen peroxide liquid. Timely remind users to add hydrogen peroxide liquid to avoid sterilization failure. When hydrogen peroxide needs to be injected, the step distance of the stepping motor is controlled by the stepping motor control circuit, and then the capacity of hydrogen peroxide entering the metering pump is controlled. Since the accuracy of the metering pump can reach 1μL, accurate supply can be realized. In this way, the amount and precision of the liquid supply depends on the precision of the stepper motor control. After the above actions are completed, inject the liquid in the metering pump into the first-stage vaporization cylinder to heat and vaporize, and cooperate with the temperature relay to control the temperature at the vaporization temperature of the hydrogen peroxide liquid, and then control the opening and closing of the solenoid valve to reduce the peroxide The hydrogen gas is transported to the secondary vaporization cylinder through the delivery pipeline, and after being vaporized again, it enters the sterilization chamber through the gas nozzle for diffusion to prepare the gas for plasmaization.

The hydrogen peroxide filling system of the plasma sterilizing device of the present invention has simple structure and low price, and can accurately supply a very small amount of liquid to the sterilizing chamber, has high precision, and is convenient for popularization and application.

Description of drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

In the figure: 1. Gas nozzle 2. Secondary vaporization cylinder 3. Thermocouple 4. Insulation delivery pipeline 5. Liquid level probe 6. Bottle piercer 7. Liquid storage tank 8. Semiconductor refrigerator 9. High precision Metering pump 10. Metering pump fixing bracket 11. Component bracket 12. Solenoid valve 13. Primary vaporizer 14. Thermocouple.

Detailed ways

The present invention will be further described in conjunction with the accompanying drawings of the above-mentioned embodiments.

As shown in the figure, the plasma sterilization device hydrogen peroxide filling system according to the present invention includes a bracket, a liquid storage tank, a vaporizer and a delivery pipeline, the liquid storage tank and the vaporizer are connected by a delivery pipeline, and the vaporizer is electrically heated The vaporization cylinder is equipped with a liquid level probe 5 in the liquid storage tank, and a control solenoid valve 12 is provided between the vaporization cylinder and the gas nozzle 1. The vaporization cylinder includes two stages, and the solenoid valve 12 is located at the connection between the two stages of vaporization cylinders. On the pipeline, the gas nozzle 1 is connected to the second-stage vaporization cylinder 2, the temperature measuring thermocouple 3, 14 is installed in the vaporization cylinder, the high-precision metering pump 9 is connected to the delivery pipeline 4, and a stepping motor is installed to cooperate with the metering pump. The bottom of the liquid tank 7 is provided with a semiconductor refrigerator 8, and the liquid storage tank 7 is provided with a corresponding bottle piercer 6 above.

When the sterilizing device needs to inject hydrogen peroxide, align the gas nozzle with the hydrogen peroxide inlet of the plasma sterilizing device for filling. The step distance of the stepper motor is controlled by the stepper motor control circuit, and then the capacity of the hydrogen peroxide entering the metering pump is controlled to realize accurate supply. The liquid in the metering pump is heated and vaporized in the first-stage vaporization cylinder, and the temperature is controlled at the vaporization temperature of the hydrogen peroxide liquid with the temperature relay, and then the hydrogen peroxide gas is transported to the The secondary vaporization cylinder enters the sterilization chamber through the gas nozzle after re-vaporization.

Claims (8)

1. A hydrogen peroxide filling system for a plasma sterilization device, comprising a bracket, a liquid storage tank, a vaporizer and a delivery pipeline, the liquid storage tank and the vaporizer are connected by a delivery pipeline, and a gas nozzle is connected to the vaporizer, which is characterized in that A high-precision metering pump is connected to the delivery pipeline, and a stepping motor is installed with the metering pump. 2. The hydrogen peroxide filling system of the plasma sterilization device according to claim 1, characterized in that a semiconductor refrigerator is provided at the bottom of the liquid storage tank. 3. The hydrogen peroxide filling system for the plasma sterilization device according to claim 1, characterized in that the vaporizer is an electrically heated vaporizer. 4. The hydrogen peroxide filling system for a plasma sterilizing device according to claim 1, 2 or 3, characterized in that the liquid storage tank is provided with a corresponding bottle piercer. 5. The hydrogen peroxide filling system of the plasma sterilizing device according to claim 4, characterized in that a control solenoid valve is set between the vaporizer and the gas nozzle. 6. The hydrogen peroxide filling system of the plasma sterilization device according to claim 5, characterized in that the vaporizer includes two stages, the solenoid valve is set on the connecting pipeline between the two stage vaporizers, and the gas vaporizer is connected to the second stage. nozzle. 7. The hydrogen peroxide filling system for a plasma sterilizing device according to claim 6, characterized in that a thermometer is installed in the vaporizer. 8. The hydrogen peroxide filling system of the plasma sterilization device according to claim 7, characterized in that a liquid level probe is installed in the liquid storage tank.

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