KR101916395B1 - Superheated steam generator to sterilize pathogenic microorganism - Google Patents

Abstract

The present invention relates to a superheated water vapor generator for sterilizing pathogenic microorganisms, and more particularly, to a superheated water vapor generator for sterilizing pathogenic microorganisms, comprising: a saturated water vapor generator for heating water supplied from a water storage tank to form saturated water vapor; A superheated water vapor generating unit provided at one side of the saturated water vapor generating unit and heating the saturated water vapor using a sieve heater to form superheated water vapor; A heat insulating coupling pipe for supplying saturated steam generated in the superheated steam generator to the superheated steam generator; An outer housing that houses the saturated steam generating unit, the superheated steam generating unit, and the heat insulating coupling pipe; and an outer housing connected to the superheated steam generating unit and extending to the outside of the outer housing, A discharge nozzle for directly supplying the generated superheated water vapor to the object to be sterilized; An input unit for receiving a desired temperature of the superheated steam; A thermocouple provided in the connection region of the superheated steam generator and the discharge nozzle to measure a temperature of superheated steam discharged through the discharge nozzle; And a control unit for controlling the driving of the sheath heater by comparing the current temperature sensed by the thermocouple with the desired temperature input from the input unit.

Description

[0001] SUPERHEATED STEAM GENERATOR TO STERILIZE PATHOGENIC MICROORGANISM [0002]

The present invention relates to a superheated water vapor generator for sterilizing pathogenic microorganisms, and more particularly, to a superheated water vapor generator for sterilizing pathogenic microorganisms that can be used for sterilizing pathogenic biofilm forming bacteria and Norovirus existing on food and apparatus surfaces .

Food poisoning accidents caused by foodborne microorganisms are steadily increasing. It is known that these pathogenic microorganisms are present on various surfaces in the food itself or in food cooking and storage environments, and cause food poisoning through cross contamination of food. In addition, many biofilm-related infectious diseases are occurring in such food contact surfaces due to the presence of a large number of materials such as stainless steel, plastic, and rubber, which are susceptible to microbial settlement and biofilm formation.

In order to control pathogenic microorganisms present on the surface of food and apparatus, ultraviolet, high pressure, electric fields, ultrasound, gaseous sanitizer, acid / base wash Acid / alkali wash, chlorine disinfectant (chlorine) and peracid sanitizer have been studied.

However, in the case of high pressure, electric field, ultrasonic treatment, etc., there is a disadvantage that the sterilization processable area is narrow in practical application, and there is a problem that the fixed equipment is only used and the installation and processing cost is high. In case of ultraviolet ray treatment, installation and processing costs are low but the penetration depth of ultraviolet rays is low, so there is a disadvantage that the pathogenic microorganisms present in the gaps between food and apparatus can not be controlled. In case of gas sterilizing agent, there may be safety problems of workers.

In addition, various chemical disinfectants may produce residues after treatment, may react with organic matter to produce harmful by-products, and may cause corrosion depending on the type of contact surface. These problems require a washing process that requires a large amount of washing water after chemical disinfectant disinfectant treatment. In this process, there is a problem of recontamination of pathogenic microorganisms due to the reuse of washing water.

Accordingly, there is a need to develop a sterilizing apparatus which can be easily used in a food manufacturing process and a foodservice business and has an excellent effect of controlling pathogenic microorganisms.

Registration No. 10-0780575 entitled "Heating, sterilizing, drying apparatus using superheated steam generator" Registration No. 10-1255112 "Sterilization heater using superheated steam"

An object of the present invention is to provide a superheated water vapor generator which can be easily used in a food manufacturing process and a foodservice business and can effectively control pathogenic microorganisms in a short processing time.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention by those skilled in the art.

The object of the present invention can be achieved by a superheated water vapor generator. The superheated water vapor generating apparatus of the present invention comprises: a saturated water vapor generating unit for heating water supplied from a water storage tank to form saturated water vapor; A superheated water vapor generating unit provided at one side of the saturated water vapor generating unit and heating the saturated water vapor using a sieve heater to form superheated water vapor; A heat insulating coupling pipe for supplying saturated steam generated in the superheated steam generator to the superheated steam generator; An outer housing that houses the saturated steam generating unit, the superheated steam generating unit, and the heat insulating coupling pipe; and an outer housing connected to the superheated steam generating unit and extending to the outside of the outer housing, A discharge nozzle for directly supplying the generated superheated water vapor to the object to be sterilized; An input unit for receiving a desired temperature of the superheated steam; A thermocouple provided in the connection region of the superheated steam generator and the discharge nozzle to measure a temperature of superheated steam discharged through the discharge nozzle; And a control unit for controlling the driving of the sheath heater by comparing the current temperature sensed by the thermocouple with the desired temperature input from the input unit.

According to one embodiment, the superheated steam generating unit includes a superheated steam generating chamber connected to the heat insulating coupling pipe and having the sieve heater disposed therein; And a condensed water discharge pipe provided at one side of the steam generating chamber to discharge the condensed condensed water without being converted into superheated steam in the sieve heater.

According to an embodiment, a solid state relay is provided between the control unit and the sheath heater to intermittently supply power to the sheath heater.

According to one embodiment, the discharge nozzle may be formed in a tube shape which is deformable and has a heat insulating function.

The superheated water vapor generating device according to the present invention can be miniaturized to a saturated steam generating unit and a superheated steam generating unit so that the size of the sterilizing equipment as a whole can be greatly reduced as compared with the conventional sterilizing equipment so that it can be easily applied to a food manufacturing process and a foodservice business.

Also, the superheated water vapor generating apparatus according to the present invention measures the temperature at the end of the superheated steam generating chamber, and adjusts the superheated steam temperature within the range of 100-250 ° C through feedback control.

In addition, the condensed water in the superheated steam generating chamber can be discharged to the outside through the condensed water discharge pipe, so that the efficiency of generating superheated steam does not decrease even after a lapse of time.

In addition, the generated superheated steam can be discharged through the adiabatic nozzle to treat the pathogenic microorganisms present at the desired position without heat loss.

In addition, the pathogenic biofilm-forming bacteria or norovirus can be effectively treated in a short time by using the superheated water vapor discharged through the present invention.

1 is a perspective view illustrating an external configuration of a superheated steam generator according to the present invention,
FIG. 2 is a conceptual diagram schematically showing a configuration of a superheated water vapor generator according to the present invention,
FIGS. 3 to 10 are graphs and charts showing results of pathogen sterilization experiments using the superheated water vapor generator according to the present invention.

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that in the drawings, the same members are denoted by the same reference numerals. Detailed descriptions of well-known functions and constructions which may be unnecessarily obscured by the gist of the present invention are omitted.

FIG. 1 is a perspective view showing an external configuration of a superheated steam generator 1 according to the present invention, and FIG. 2 is a conceptual diagram schematically showing an internal configuration of a superheated steam generator 1.

As shown in the drawings, the superheated water vapor generating apparatus 1 according to the present invention includes an outer housing 100, a saturated water vapor which is contained in the outer housing 100 and heats the water W to form a saturated water vapor V1, A superheated water vapor generator 400 for heating the saturated water vapor V1 generated in the saturated water vapor generator 200 to generate superheated water vapor V2, a saturated water vapor generator 200 A discharge nozzle 600 for supplying the superheated water vapor V2 generated in the superheated steam generator 400 to the sterilization target, And a control unit (700) for controlling the control unit (700).

The outer housing 100 houses the saturated water vapor generator 200, the overheated water vapor generator 400, and the thermal insulation connector 300 together. The outer surface of the outer housing 100 is provided with an input unit 110 for turning on or off the power or controlling whether or not the superheated steam is discharged to the outside. The saturation steam V1 generated in the saturated steam generator 200 And a display unit 120 for displaying the temperature of the superheated steam V2 generated in the superheated steam generator 400.

A moving wheel 130 is provided under the outer housing 100 so that the user can easily move the overheated steam generator 1. Thereby, the user can carry the overheated water vapor generator 1 and can easily sterilize the object of sterilization required.

A condensed water discharge pipe 411 extending from the superheated steam generator 400 is provided in the lower portion of the outer housing 100 and a condensed water discharge valve 413 is provided in the condensed water discharge pipe 411 for controlling the discharge of the condensed water.

In addition, a plurality of ventilation openings for discharging the heat generated from the inside to the outside are formed on the surface of the outer housing 100.

The outer housing 100 of the present invention includes a saturated water vapor generating unit 200 and a superheated water vapor generating unit 400 so as to be housed therein to reduce the size of the entire equipment and simplify carrying, There are advantages.

The saturated water vapor generator 200 heats the water W to form a saturated water vapor V1. The saturated water vapor generating unit 200 includes a water storage tank 210 in which water is stored as shown in FIG. 2, and a saturated water vapor generating unit 220 in which water W supplied from the water storage tank 210 is formed into a saturated water vapor V1 A chamber 220, and a first heater 230 provided inside the saturated steam generating chamber 220.

The water storage tank 210 is accommodated inside the outer housing 100. The user opens the outer housing 100 and uses the water W to be filled in the water storage tank 210. At this time, a water level meter is provided in the water storage tank 210, and the display unit 120 displays the current water level of the water storage tank 210 so that the user can fill the water.

The water in the water storage tank 210 can be supplied to the saturated water vapor generating chamber 220 by opening and closing a water supply valve (not shown) under the control of the controller 700.

The saturated water vapor generating chamber 220 is formed in the shape of a closed enclosure and has one end connected to the water supply pipe 211 of the water storage tank 210 and the other end connected to the heat insulating connection pipe 300.

A first heater 230 is provided in the saturated water vapor generating chamber 220. The first heater 230 receives power from the power supply unit 500 and heats the water W to generate saturated water vapor V1). Here, the first thermometer 240 is provided in the region where the heat insulating coupling tube 300 of the saturated steam generating chamber 220 is coupled. The first thermometer 240 is connected to the first thermostat 241 to prevent the first heater 230 from overheating.

The thermal insulation coupling pipe 300 connects the saturated steam generating chamber 220 and the superheated steam generating chamber 410 to each other to supply the saturated steam V1 to the superheated steam generating chamber 410. The heat insulating coupling pipe 300 may be formed of a Teflon material having an insulating effect to minimize heat loss during the transfer of the saturated water vapor V1 to the superheated steam generating chamber 410 and to prevent condensation due to temperature decrease .

The superheated water vapor generator 400 generates the superheated water vapor V2 at 100 to 250 ° C by heating the saturated water vapor V1 supplied through the heat insulation coupling tube 300 to the second order. The superheated steam generating unit 400 includes a superheated steam generating chamber 410 and a sieve heater 420 disposed inside the superheated steam generating chamber 410 to heat the saturated steam V1.

The superheated steam generating chamber 410 is formed in a closed housing shape. The sheath heater 420 is disposed along the longitudinal direction of the superheated steam generating chamber 410 to generate superheated steam V2.

Here, the overheated water vapor generating chamber 410 is provided with a second thermostat 431 using a bimetal to solve the safety problem due to overheating of the sheath heater 420. A second thermometer 430 is provided in the superheated steam generating chamber 410 and receives the maximum permissible temperature of the superheated steam generating chamber 410 through the input unit 110 within a temperature of 300 °.

 The second thermostat 431 is connected to the sheath heater 420 of the power supply unit 500 when the temperature of the sheath heater 420 detected by the second thermometer 430 is heated to a temperature higher than a user- 420 are cut off.

The superheated water vapor V2 generated in the superheated steam generating chamber 410 is discharged to the outside through the discharge nozzle 600. [ At this time, the temperature of the superheated steam V2 discharged by mounting the thermocouple 440 between the discharge nozzle 600 and the superheated steam generating chamber 410 is measured in real time.

The desired temperature of the superheated steam V2 desired by the user is set through the input unit 110. The input unit 110 and the thermocouple 440 are interlocked with the solid state relay 450, 420) is 0n / off.

A condensate discharge pipe 411 is formed at the lower end of the superheated steam generating chamber 410 to discharge the condensed condensed water without converting the superheated steam V2 into the superheated steam V2 from the sieve heater 420, So as not to lower the heating efficiency of the heater.

The power supply unit 500 supplies power to the first heater 230 and the sheath heater 420 under the control of the controller 700. The controller 700 controls the power supply of the first heater 230 by the operation of the first thermometer 240 and the first thermostat 241 described above and controls the power supply of the second thermometer 430 and the second thermostat 241 431 and the thermocouple 440 and the solid state relay 450 to control the power supply of the sheath heater 420.

By this control process, the saturated water vapor generating unit 200 and the overheated water vapor generating unit 400 can be sterilized safely without overheating.

The discharge nozzle 600 is coupled to the superheated steam generating chamber 410 and extends to a predetermined length outside the outer housing 100. The discharge nozzle 600 is formed in the shape of a tube of an elastic material capable of deforming the shape and allowing the user to take the discharge nozzle 600 into the object to be sterilized to be sterilized by holding the discharge nozzle 600 Allow the superheated water vapor (V2) to be discharged.

Although not shown in the drawing, a discharge nozzle opening / closing valve (not shown) for interrupting the discharge of superheated water vapor through the discharge nozzle 600 is provided. When the user selects to discharge the superheated water vapor through the input unit 110, the discharge nozzle opening / closing valve (not shown) is opened.

At this time, the inside of the discharge nozzle 600 is heat-treated so that there is no heat loss of superheated water vapor.

Thereby, there is an advantage that the object to be sterilized at various positions can be treated without heat loss.

FIGS. 3 to 10 show results of experiments on sterilizing pathogenic microorganisms using the superheated water vapor generator 1 according to the present invention.

First, a biofilm using pathogenic microorganisms was formed prior to the experiment. For this purpose, E. coli O157: H7 ( Escherichia coli O157: H7), Salmonella tie blood bunch Titanium (Salmonella Typhimurium) or L. monocytogenes Zenith (Listeria monocytogenes ) were cultured in 10 ml of tryptic soy broth (TSB) medium at 37 ° C for 24 hours, and then the culture broth was centrifuged at 5,000 × g at 4 ° C for 15 minutes to collect the cell pellet Respectively.

The collected cells were put into a buffer solution of PBS (phosphate-buffered saline, pH 7.4; 137 mM NaCl, 2.7 mM KCl, 10 mM Na ₂ HPO ₄ , 1.8 mM H ₂ PO ₄ ), and about 10 ⁷ to 10 ⁸ CFU / ml Each suspension was made.

Meanwhile, a stainless steel coupon (5 × 2 cm) was sterilized with 70% ethanol, dried in a biosafety hood (22 ± 2 ° C.) for 3 hours, sterilized in a high pressure steam autoclave Then, the cells were immersed in a 50 ml conical centrifuge tube containing 30 ml of the bacterial suspension prepared above, and then cultured at 4 ° C for 24 hours for attachment of bacteria.

Thereafter, the sterilized tweezers were taken out of the stainless steel specimen, and the unattached microorganisms were removed by shaking in 300 ml of sterilized distilled water (22 ± 2 ° C.) for 5 seconds. Thereafter, the tube for centrifugation containing 30 ml of TSB medium conical centrifuge tube, and the biofilm of each strain was formed at 25 ℃ for 6 days.

Experiment 1 was conducted to analyze the sterilizing power of the overheated water vapor generator 1 using the biofilms of the bacteria thus formed.

The stainless steel specimen having the pathogenic microorganism biofilm formed thereon was taken out from the tube and put into sterilized distilled water to remove suspended substances and then the stainless steel specimen was placed in the superheated water vapor generating apparatus 1 of the present invention 10, 15, 20, 25, and 30 seconds respectively with 1 atm of 130 ° C and 160 ° C of superheated steam. At this time, in the comparative test group, saturated steam of 1 atm 100 ° C in the saturated water vapor state was treated at the same time intervals in the stainless steel specimen from which the suspended material was removed.

Each stainless steel specimen treated with superheated water vapor and saturated water vapor was placed in a tube containing 30 ml of PBS buffer and 3 g of sterilized glass beads (425 to 600 μm) and placed in a vortex mixer. And driven at a maximum speed for 1 minute, so that the biofilm strain attached to the stainless steel specimen was dropped. The cells were then diluted 10-fold with sterile 9-ml buffered peptone water (BPW) and fractionated on each selection medium.

For each pathogen count, E. coli O157: H7 was cultured in sorbitol MacConkey agar (SMAC), Salmonella typhimurium was cultured in xylose desoxycholate agar (XLD), Listeria The monocytogenes were incubated in an oxford agar base (OAB) supplemented with an antimicrobic supplement.

Three kinds of medium were cultured at 37 ° C for 24 to 48 hours. Typical colonies were counted in a selection medium among the resulting colonies, and the number of colonies of E. coli O157: H7, Salmonella typhimurium or Listeria monocytogenenis The results of Experiment 1 are shown in FIGS. 3, 4 and 5, respectively.

3 to 6 are graphs showing experimental results when sterilized with 100 ° saturated water vapor and graphs showing empty circles showing experimental results of light oil sterilized with 130 ° C superheated steam , And black inverted triangles are graphs showing the results of experiments when sterilized with 160 ° C superheated steam.

As shown, it can be seen that E. coli O157: H7, Salmonella typhimurium or Listeria monocytogenenis are sterilized more rapidly in the high temperature superheated steam of 160 ° C, and the population is reduced.

That is, as the temperature of the superheated steam increases, the biofilm control effect of E. coli O157: H7, Salmonella typhimurium and Listeria monocytogenenis formed on the stainless steel specimen is higher, and superheated water vapor 130, 160 ℃) was higher than the biofilm sterilization capacity of saturated water vapor (100 ℃).

In Experiment 2, the effect of the superheated water vapor (V2) generated in the superheated water vapor generator (1) of the present invention on the damage degree of the pathogenic microorganisms in the biofilm was examined.

After the pathogenic microorganisms are not completely killed by the sterilization treatment and injured, the pathological conditions are restored when the environmental conditions are suitable for growth. Therefore, it is important to completely kill bacteria without the generation of pathogenic microorganisms that are damaged in the sterilization of pathogenic microorganisms.

Stainless steel specimens with pathogenic microbial biofilms were treated in the same manner as in Experiment 1, and E. coli O157: H7 was cultured on sorbitol macaque medium for each pathogen count. Salmonella typhimurium Cultured on a xylose desoxycholate medium, and Listeria monocytogenes was cultured on an Oxford medium supplemented with anti-microbial supplement.

E. coli O157: H7 is cultured in sorbitol phenol red agar (SPRAB) for the evaluation of pathogenic microorganisms, and Salmonella typhimurium is added to TSA (tryptic soy agar) (OV-XLD). Listeria monocytogenes was cultured in TSA medium at 37 DEG C for 2 hours, and then 7 ml of anti-microbial supplement was added thereto The added Oxford medium was cultured thereon (OV-OAB).

Six kinds of medium were cultured at 37 占 폚 for 24 to 48 hours. Typical colonies were counted in a selective medium among the resulting colonies and the number of colonies of Escherichia coli O157: H7, Salmonella typhimurium or Listeria monocytogenen The results are shown in Figs. 6, 7 and 8, respectively.

FIG. 6 is a table comparing the number of E. coli O157: H7 in the biofilm damaged by the superheated steam treatment, and FIG. 7 is a graph comparing the number of Salmonella typhimurium in a biofilm injured by superheated steam treatment And FIG. 8 is a chart comparing the number of Listeria monocytogenes in a biofilm injured by superheated steam treatment.

As a result of the experiment, it was found that, in the case of superheated steam (130 ° C., 160 ° C.), bacteria were controlled without causing generation of bacteria damaged in the sterilization of E. coli O157: H7, Salmonella typhimurium and Listeria monocytogenenis in the biofilm And it was confirmed that the effect of the superheated water vapor treatment was superior to that of the saturated water vapor by confirming that the generation of damaged bacteria was generally caused by the saturated water vapor (100 ° C.).

Meanwhile, Experiment 3 was performed to analyze the disinfection power of the super-heated water vapor generated from the overheated water vapor generator 1 according to the present invention on the surrogate for substitution of norovirus.

For this purpose, a stainless steel specimen inoculated with murine Norovirus was prepared.

Murine norovirus was infected with RAW 264.7 cell line and cultured in a 37 ° C CO ₂ incubator for 3-4 days to make stock of murine norovirus, a microorganism substituting for Norovirus. When cells become more than 90% from the surface, cells and virus-containing media are transferred to a 50-ml tube, centrifuged to remove cells, and the supernatant is mixed with an equal volume of chloroform. The virus was extracted by centrifugation for one minute. Then, it was centrifuged at 5,000 × g at 4 ° C for 10 minutes through filtration, concentrated and the concentrated murine norovirus was dispensed at 100 μL and stored at -80 ° C.

For Experiment 3, the murine Norovirus stock was diluted to 10 ⁶ -10 ⁷ PFU / ml in a stainless steel coupon (5 cm x 2 cm) and polyvinyl chloride (PVC) using a micropipette, ml, and then dried at room temperature for 1 hour.

The stainless steel specimen and the polyvinyl chloride specimen inoculated with murine norovirus were subjected to superheated water vapor at 1 atm 150 ° C in the superheated steam state of the superheated steam generator 100 of the present invention for 1, 2, 3, 4 and 5 seconds Respectively. At this time, the stainless steel specimen and the polyvinyl chloride specimen were treated with a saturated steam of 1 atm 100 ° C in the saturated steam at the same time intervals.

Each of the stainless steel specimens and polyvinyl chloride specimens treated with superheated water vapor and saturated water vapor was placed in a tube containing 10 ml of PBS buffer solution and 1 g of sterilized glass beads and placed in a vortex mixer for 5 minutes, The stainless steel specimens and the polyvinyl chloride specimens were dropped on the murine norovirus.

The count of murine norovirus was determined by the plaque assay method. For experiment 3, Raw 264.7 cells were seeded at 5 × 10 ⁶ cells / well in a 6-well plate and cultured in a 37 ° C CO ₂ incubator for one day. Murine Norovirus treated with 150 ° C superheated steam and 100 ° C saturated water vapor was diluted stepwise in Dulbecco's Modified Eagle Medium (DMEM) medium, and the medium was removed from the 6-well plate. 500 μl of diluted murine norovirus was added to each well.

Murine norovirus was incubated in a 37 ° C CO ₂ incubator for 1 hour, and 2 × MEM was mixed with distilled water containing 1.5% seaplaque agarose in a ratio of 1: 1. Cells were harvested at 3 mL per well. Agarose was immobilized at room temperature for 20-30 minutes, and then placed in a 37 ° C CO ₂ incubator and cultured for 3-4 days until plaque formation. When plaques were observed, plaques were measured and quantitated in PFU / mL.

The results of Experiment 3 are shown in FIGS. 9 and 10, respectively. FIG. 9 is a curve of a murine norovirus reduction in a stainless steel specimen according to superheated steam or saturated steam treatment, and FIG. 10 is a curve of a murine norovirus reduction in a polyvinyl chloride specimen according to superheated steam or saturated steam treatment.

The graphs shown by solid lines in FIGS. 9 and 10 are graphs treated with 150.degree. C. superheated steam, and the graphs shown with dotted lines are graphs treated with saturated steam at 100.degree. C.

As a result of the experiment 3, it was found that the sterilization power of Murine Norovirus of superheated water vapor (150 ° C) was higher than that of saturated water vapor (100 ° C) in stainless steel and polyvinyl chloride specimen as shown in FIGS. 9 and 10 And it was confirmed that all bacteria were reduced to below the detection limit within 3 seconds in the case of superheated steam treatment, compared to 5 minutes after the treatment of saturated steam.

As described above, the superheated water vapor generator according to the present invention can miniaturize the saturated water vapor generator and the overheated water vapor generator, thereby greatly reducing the size of the sterilizer as compared with the conventional sterilizer, have.

Also, the superheated water vapor generating apparatus according to the present invention measures the temperature at the end of the superheated steam generating chamber, and adjusts the superheated steam temperature within the range of 100-250 ° C through feedback control.

In addition, the condensed water in the superheated steam generating chamber can be discharged to the outside through the condensed water discharge pipe, so that the efficiency of generating superheated steam does not decrease even after a lapse of time.

In addition, the generated superheated steam can be discharged through the adiabatic nozzle to treat the pathogenic microorganisms present at the desired position without heat loss.

In addition, the pathogenic biofilm-forming bacteria or norovirus can be effectively treated in a short time by using the superheated water vapor discharged through the present invention.

The embodiments of the superheated water vapor generator for sterilizing pathogenic microorganisms according to the present invention described above are merely illustrative and those skilled in the art will appreciate that various modifications and equivalent embodiments can be made without departing from the scope of the present invention. You can see that it is possible. Therefore, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

1: superheated water vapor generator 100: outer housing
110: input unit 120:
130: Moving wheel 200: Saturated steam generator
210: water storage tank 211: water supply pipe
220: Saturated steam generating chamber 230: First heater
240: first thermometer 241: first thermostat
300: Adiabatic connector 400: Superheated steam generator
410: superheated water vapor generating chamber 411: condensed water discharge pipe
413: Condensate discharge valve 420: Sheath heater
430: second thermometer 431: second thermostat
440: Thermocouple 450: Solid State Relay
500: Power supply unit 600: Discharge nozzle
700:

Claims (4)

A saturated water vapor generating unit for heating the water supplied from the water storage tank to form saturated water vapor;
A superheated steam generating unit provided at one side of the saturated steam generating unit and heating the saturated steam using a sieve heater to form superheated steam;
An insulating coupling pipe connecting the saturated water vapor generating unit and the overheated water vapor generating unit to each other to supply saturated water vapor generated in the saturated water vapor generating unit to the overheated water vapor generating unit;
An outer housing housing the saturated water vapor generating unit, the overheated water vapor generating unit, and the heat insulating coupling pipe;
A discharge nozzle connected to the superheated steam generator and extending to the outside of the outer housing to directly supply superheated steam generated in the superheated steam generator to a sterilization target;
An input unit for receiving a desired temperature of the superheated steam;
A thermocouple provided in the connection region of the superheated steam generator and the discharge nozzle to measure a temperature of superheated steam discharged through the discharge nozzle;
And a control unit for controlling driving of the sheath heater by comparing a current temperature detected by the thermocouple with a desired temperature inputted from the input unit,
A moving wheel is provided at a lower portion of the outer housing,
The saturated water vapor generating unit may include:
A water storage tank in which water is stored;
A saturated water vapor generating chamber having a first heater and a first thermometer, one end connected to the water supply pipe of the water storage tank and the other end connected to the insulating connection pipe, the water supplied from the water storage tank being formed of saturated water vapor, ;
And a first thermostat for preventing overheating of the first heater,
Wherein the heat insulating coupling pipe is formed of a Teflon material having a heat insulating effect,
The superheated steam generating unit may include:
A superheated water vapor generating chamber connected to the heat insulating connection pipe and having the sieve heater and the second thermometer disposed therein;
A condensate discharge pipe provided at one side of the superheated steam generating chamber and discharging the condensed condensed water without converting the superheated steam into heat in the sieve heater;
And a second thermostat for preventing overheating of the sheath heater,
A solid state relay is provided between the control unit and the sheath heater to intermittently supply power to the sheath heater,
The discharge nozzle is formed in a tube shape which is deformable in shape and has a heat insulating function,
Selected from: (H7 Escherichia coli O157), Salmonella tie blood bunch Titanium (Salmonella Typhimurium), L. monocytogenes Zenith (Listeria monocytogenes), and murine norovirus (murine norovirus): to generate superheated steam of 150 ~ 250 ℃ E. coli O157 H7 Wherein the microorganism is sterilized by the microorganism. delete delete delete

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