JP2021107040A - Manufacturing apparatus of sterilization water, manufacturing method of sterilization water, and manufacturing method of sterilized article - Google Patents

Abstract

To provide sterilization water having high sterilization factor concentration and capable of sterilizing other articles.SOLUTION: A manufacturing apparatus of sterilization water is assembled with a member, a nozzle, and a discharge plasma generating mechanism. The member includes a cyclic water channel. Water circulates in the cyclic water channel. The nozzle generates cavitation bubbles in water. The discharge plasma generating mechanism generates discharge plasma in a space where cavitation bubbles are allowed to be generated. The member includes a water channel where water flows, and the manufacturing apparatus of sterilization water may be assembled with an ozone water supply part for supplying ozone water on a downstream side of a space of the water channel where cavitation bubbles are allowed to be generated.SELECTED DRAWING: Figure 2

Description

The present invention relates to an apparatus for producing sterilized water, a method for producing sterilized water, and a method for producing a sterilized object.

In the water treatment apparatus described in Patent Document 1, cavitation bubbles are generated in the water to be treated, and discharge plasma is formed in the space where the cavitation bubbles are generated (claim 1). Thereby, the sterilization treatment of the water to be treated can be performed (paragraph 0013).

Japanese Patent No. 4453052

In the water treatment apparatus described in Patent Document 1, the water to be treated can be sterilized only by water and electric energy. However, in the water treatment apparatus, it is difficult to increase the concentration of a sterilizing factor that contributes to sterilization, so that it is difficult to produce sterilized water capable of sterilizing other objects.

The present invention has been made in view of this problem. An object to be solved by the present invention is to produce sterilizing water having a high concentration of sterilizing factors and capable of sterilizing other objects.

The first aspect of the present invention is directed to an apparatus for producing sterilized water.

The sterilizing water production apparatus includes a member, a nozzle, and a discharge plasma generation mechanism.

The member has an annular channel. Water circulates in the circular channel.

The nozzle creates a cavitation bubble in the water.

The discharge plasma generation mechanism generates discharge plasma in the space where the cavitation bubble is generated.

The second aspect of the present invention is directed to an apparatus for producing sterilized water.

The sterilizing water production apparatus includes a member, a nozzle, a discharge plasma generation mechanism, and an ozone water supply unit.

The member has a water channel. Water flows through the waterways.

The nozzle creates a cavitation bubble in the water.

The discharge plasma generation mechanism generates discharge plasma in the space where the cavitation bubble is generated.

The ozone water supply unit supplies ozone water to the downstream side of the space where the cavitation bubble of the water channel is generated.

The present invention is also directed to a method for producing sterilized water and a method for producing a sterilized object.

According to the first aspect of the present invention, the process of generating cavitation bubbles in water and generating discharge plasma in the space where the cavitation bubbles are generated is repeatedly performed on water. In addition, chemical substances that produce bactericidal factors and have a long life are produced in water. This makes it possible to produce sterilizing water having a high concentration of sterilizing factors and capable of sterilizing other objects.

According to the second aspect of the present invention, water is subjected to a process of generating cavitation bubbles in water and generating discharge plasma in the space where the cavitation bubbles are generated. In addition, chemical substances that produce bactericidal factors and have a long life are produced in water. In addition, ozone water containing ozone, which produces a bactericidal factor and has a long life, is supplied, and the supplied ozone water is impacted by cavitation to suppress the ozone contained in the ozone water from coming out of the ozone water. can do. This makes it possible to produce sterilizing water having a high concentration of sterilizing factors and capable of sterilizing other objects.

The objects, features, aspects and advantages of the present invention will be made clearer by the following detailed description and accompanying drawings.

It is a figure which illustrates typically the sterilizing water production apparatus of 1st Embodiment. It is sectional drawing which shows typically the cross section of the reactor provided in the sterilizing water production apparatus of 1st Embodiment. It is a graph which shows the change of the number of sterilization digits by the energy density put into water in the sterilizing water production apparatus of 1st Embodiment. It is a graph which shows the change of the concentration of _{H 2} O _{2 in} the sterilizing water by the energy density put into water in the sterilizing water production apparatus of 1st Embodiment. It is a figure which illustrates typically the sterilizing water production apparatus of 2nd Embodiment. It is a figure which illustrates typically the sterilizing water production apparatus of 3rd Embodiment.

1 Sterilized water production apparatus FIG. 1 is a diagram schematically showing a sterilized water production apparatus of the first embodiment.

The sterilizing water production apparatus 100 illustrated in FIG. 1 includes an annular pipe 110, a reactor 112, a cooler 114, and a pump 116. The manufacturing apparatus 100 may include elements other than these elements.

The annular pipe 110 has an annular water channel. Water circulates in the annular water channel in the annular pipe 110. The annular tube 110 may be replaced with a member that is not a tube. For example, the annular tube 110 may be replaced with an annular hose.

A reactor 112, a cooler 114, and a pump 116 are inserted into the annular tube 110. Therefore, the water circulating in the annular water channel in the annular pipe 110 passes through the reactor 112, the cooler 114, and the pump 116 in that order. The reactor 112 treats the water that passes through the reactor 112. The cooler 114 cools the water passing through the cooler 114. The pump 116 provides a flow of water passing through the pump 116. As a result, the water cooled by the cooler 114 is repeatedly treated by the reactor 112, a sterilizing factor is generated in the treated water, and sterilizing water containing the produced sterilizing factor is produced.

The manufacturing apparatus 100 further includes a branch pipe 118 and a valve 120.

The branch pipe 118 has a branch channel. The branch water channel in the branch pipe 118 extends from the annular water channel in the annular pipe 110 to the outside of the manufacturing apparatus 100. The produced sterilizing water is taken out of the manufacturing apparatus 100 via the branch water channel in the branch pipe 118. The branch pipe 118 may be replaced with a member that is not a pipe. For example, the branch pipe 118 may be replaced with a branch hose. The branch pipe 118 may be omitted, and the sterilizing water may be taken out of the manufacturing apparatus 100 through the holes formed in the annular pipe 110.

A valve 120 is inserted into the branch pipe 118. While the valve 120 is closed, the water in the annular channel 110 in the annular tube 110 circulates in the annular channel 110 without being taken out of the manufacturing apparatus 100. While the valve 120 is open, the sterilizing water can be taken out of the manufacturing apparatus 100 via the branch water channel in the branch pipe 118.

The manufacturing apparatus 100 further includes a pulse voltage application circuit 122.

The pulse voltage application circuit 122 applies a pulse voltage to the reactor 112. The reactor 112 uses the applied pulse voltage to process the water passing through the reactor 112.

The pulse voltage application circuit 122 includes a pulse power supply 130, a first wiring 132, and a second wiring 134.

The pulse power supply 130 includes a negative electrode 140 and a positive electrode 142. The pulse power supply 130 generates a pulse voltage between the negative electrode 140 and the positive electrode 142.

The first wiring 132 and the second wiring 134 transmit the generated pulse voltage from the pulse power supply 130 to the reactor 112. As a result, the transmitted pulse voltage is applied to the reactor 112.

2 Reactor FIG. 2 is a cross-sectional view schematically showing a cross section of a reactor provided in the sterilizing water production apparatus of the first embodiment.

The reactor 112 includes a tubular structure 150, as shown in FIG. The tubular structure 150 has a water channel 160 in the reactor. The water channel 160 in the reactor is connected to the water channel in the annular pipe 110. As a result, the water W passing through the reactor 112 flows through the water channel 160 in the reactor.

The tubular structure 150 includes a nozzle 170.

The nozzle 170 has an orifice shape. Therefore, when the water W passing through the reactor 112 passes through the nozzle 170, the flow velocity of the water W becomes high and the pressure of the water W becomes low. Further, after the water W passing through the reactor 112 has passed through the nozzle 170, the flow velocity of the water W becomes slower and the pressure of the water W becomes higher. As a result, cavitation occurs in the vicinity of the nozzle 170. That is, when the water W passes through the nozzle 170, the pressure of the water W becomes low, so that the water W boils and a cavitation bubble 180 is generated in the water W. Further, after the water W has passed through the nozzle 170, the pressure of the water W increases, so that the generated cavitation bubble 180 disappears. Therefore, the nozzle 170 generates a cavitation bubble 180 in the water W. Further, the reactor 112 has a space in which the cavitation bubble 180 is generated. The space is in the vicinity of the nozzle 170.

The reactor 112 includes a first electrode 190 and a second electrode 192.

As shown in FIG. 1, the first electrode 190 is electrically grounded via the first wiring 132 and electrically connected to the negative electrode 140 of the pulse power supply 130 via the first wiring 132. NS. The second electrode 192 is electrically connected to the positive electrode 142 of the pulse power supply 130 via the second wiring 134. As a result, the first electrode 190 becomes a ground electrode, the second electrode 192 becomes a high voltage electrode, a pulse voltage is applied between the first electrode 190 and the second electrode 192, and the first electrode 190 and the first electrode 190 A discharge plasma is generated between the electrode and the second electrode 192. The first wiring 132 may be omitted, and the first electrode 190 may be directly connected to the negative electrode 140. The second wiring 134 may be omitted, and the second electrode 192 may be directly connected to the positive electrode 142.

The first electrode 190 and the second electrode 192 are arranged in the vicinity of the nozzle 170. As a result, the first electrode 190 and the second electrode 192 are arranged in the space where the cavitation bubble 180 is generated, and the discharge plasma is generated in the space where the cavitation bubble 180 is generated. Therefore, the first electrode 190, the second electrode 192, and the pulse voltage application circuit 122 form a discharge plasma generation mechanism 200 that generates discharge plasma in the space. In the first embodiment, the first electrode 190 and the second electrode 192 are arranged on the downstream side of the nozzle 170. The first electrode 190 and the second electrode 192 may be arranged in the nozzle 170.

The discharge plasma generated in the space where the cavitation bubble 180 is generated generates a chemical substance in the cavitation bubble 180. The chemicals produced react to produce bactericidal factors. As a result, sterilizing water containing the produced sterilizing factor is produced.

The cavitation bubble 180 is mainly composed of water vapor and contains almost no nitrogen derived from air. Therefore, even when the discharge plasma is generated in the space where the cavitation bubble 180 is generated, nitrogen-containing compounds such as nitrogen oxides are hardly generated. Therefore, the sterilized water produced has high safety.

The first electrode 190 and the second electrode 192 are made of a conductor, for example, a metal or an alloy. The first electrode 190 and the second electrode 192 may be electrodes provided with a conductor and ceramics covering a part of the surface of the conductor.

The first electrode 190 and the second electrode 192 have a rod-like shape and extend in the radial direction of the tubular structure 150. The front ends of the first electrode 190 and the second electrode 192 are arranged in the water channel 160 in the reactor. The rear ends of the first electrode 190 and the second electrode 192 are arranged outside the tubular structure 150. The front ends of the first electrode 190 and the second electrode 192 are separated from each other in the axial direction of the tubular structure 150, that is, in the direction in which water W flows.

The distance between the first electrode 190 and the second electrode 192 is preferably 4 mm or more and 32 mm or less.

By applying a pulse voltage between the first electrode 190 and the second electrode 192, the distance between the first electrode 190 and the second electrode 192 can be increased. For example, when an AC voltage is applied between the first electrode 190 and the second electrode 192, it is difficult to make the distance between the first electrode 190 and the second electrode 192 16 mm or more. However, when a pulse voltage is applied between the first electrode 190 and the second electrode 192, the distance between the first electrode 190 and the second electrode 192 should be 16 mm or more. Is easy.

3 Production of sterilizing water When sterilizing water is produced by the sterilizing water production apparatus 100, the annular water channel in the annular pipe 110 is filled with water W. The water W to be filled may be pure water or water containing some impurities such as tap water.

Subsequently, the valve 120 is closed.

Subsequently, the pump 116 is operated. As a result, the water W circulates in the annular water channel in the annular pipe 110, and the cavitation bubble 180 is generated. The discharge pressure of the pump 116 is preferably 0.1 MPa or more and 1.5 MPa or less.

Subsequently, the cooler 114 is operated. As a result, the circulating water W is preferably cooled to about 4 ° C.

Subsequently, the pulse power supply 130 is operated. As a result, a pulse voltage is applied between the first electrode 190 and the second electrode 192, and discharge plasma is generated in the space where the cavitation bubble 180 is generated. The frequency of the pulse voltage is preferably 10 kHz or less. The peak voltage of the pulse voltage is preferably 15 kV or less. The pulse width of the pulse voltage is preferably 1 μsec or less in full width at half maximum.

The generated discharge plasma produces a bactericidal factor and produces a chemical substance having a lifetime longer than that of the radical. By this and the water W circulates in the annular water channel in the annular pipe 110, sterilizing water having a high concentration of sterilizing factor can be produced. Chemical substances that produce bactericidal factors are hydrogen peroxide (H ₂ O ₂ ) and the like. Bactericidal factors include at least one radical selected from the group consisting of hydroxyl radicals (OH ^* ) and hydroperoxide radicals (HO ₂ ^*).

Subsequently, the valve 120 is opened.

Subsequently, the produced sterilizing water is taken out of the manufacturing apparatus 100 via the branch water channel in the branch pipe 118.

According to the sterilizing water manufacturing apparatus 100, the process of generating the cavitation bubble 180 in the water and generating the discharge plasma in the space where the cavitation bubble 180 is generated is repeatedly performed on the water W. This makes it possible to produce sterilizing water having a high concentration of sterilizing factors.

Further, according to the sterilizing water production apparatus 100, by cooling the water W, the solubility of the sterilizing factor precursor and the sterilizing factor in water W is increased, and the chemical substance that produces the sterilizing factor and the sterilizing factor. The life of the product can be extended.

4 Sterilization method When an object is sterilized, sterilizing water is produced by the sterilizing water production apparatus 100, and the produced sterilizing water is brought into contact with the object. This joint treatment transforms the object into a sterilized object.

5 Experimental Example Sterilized water was produced by the sterilized water production apparatus 100. The distance between the first electrode 190 and the second electrode 192 was 32 mm. The frequency of the pulse voltage was 2 kHz. The peak voltage of the pulse voltage was 15 kV. The pulse width of the pulse voltage was set to 500 nsec at the full width at half maximum.

Subsequently, in the produced sterilized water, the change in the number of sterilized digits due to the energy density charged into the water W was investigated. The result is shown in the graph of FIG. The energy density was obtained by dividing the product of the applied power, the time the power was applied, and the efficiency by the volume of water W. The number of sterilized digits was obtained by taking the absolute value of the common logarithm of the ratio of the number of bacteria after sterilization to the number of bacteria before sterilization. From the graph of FIG. 3, it can be understood that the number of sterilization digits increases as the energy density charged into the water W increases.

Furthermore, the sterilizing water produced, investigating changes in the H ₂ O ₂ concentrations of the sterilizing water by the energy density which is poured into water W. The result is shown in the graph of FIG. From FIG. 4, it can be understood that the concentration of _{H 2} O ₂ increases as the energy density charged into the water W increases.

6 Second Embodiment FIG. 5 is a diagram schematically illustrating the sterilized water production apparatus of the second embodiment.

The sterilizing water manufacturing apparatus 201 shown in FIG. 5 includes an annular pipe 110, a reactor 112, a cooler 114, a pump 116, a branch pipe 118, and a valve 120, similarly to the sterilizing water manufacturing apparatus 100 shown in FIG. Be prepared.

Further, the manufacturing apparatus 201 further includes an ozonizer 210, unlike the sterilizing water producing apparatus 100 shown in FIG.

The ozonizer 210 generates ozone water and supplies the generated ozone water to the branch water channel in the branch pipe 118. As a result, the water cooled by the cooler 114 is repeatedly treated by the reactor 112, ozone and hydrogen peroxide are generated in the treated water, and water, ozone and hydrogen peroxide are contained, and ozone and hydrogen peroxide are converted into water. A dissolved premix solution is prepared. In addition, ozone water containing ozone, which produces a bactericidal factor and has a long life, is mixed with the prepared pre-mixing solution. Thereby, sterilizing water having high sterilizing power can be produced. The ozonizer 210 may be replaced by another type of ozone water supply unit.

The ozone water generated by the ozonizer 210 is supplied to the branch water channel in the branch pipe 118 extending from the annular water channel in the annular pipe 110 to the outside of the sterilizing water production apparatus 201. As a result, it is possible to prevent the supplied ozone water from passing through the reactor 112 and to prevent the ozone contained in the ozone water from coming out of the ozone water due to the impact of cavitation applied to the supplied ozone water.

7 Third Embodiment FIG. 6 is a diagram schematically illustrating the sterilized water production apparatus of the third embodiment.

The sterilizing water production device 300 shown in FIG. 6 includes a reactor 112, a cooler 114, a pump 116, and a valve 120, similar to the sterilizing water production device 100 shown in FIG.

Further, unlike the sterilizing water manufacturing apparatus 100 shown in FIG. 1, the manufacturing apparatus 300 includes a pipe 220 instead of the annular pipe 110 and the branch pipe 118, and further includes an ozonizer 210. The tube 220 may be replaced with a member that is not a tube. For example, the tube 220 may be replaced by a hose.

A reactor 112, a cooler 114 and a pump 116 are inserted into the pipe 220. Therefore, the water flowing through the water channel in the pipe 220 passes through the reactor 112, the cooler 114, and the pump 116 in that order. The reactor 112 treats the water that passes through the reactor 112. The cooler 114 cools the water passing through the cooler 114. The pump 116 provides a flow of water passing through the pump 116. As a result, the water cooled by the cooler 114 is treated by the reactor 112, ozone and hydrogen peroxide are generated in the treated water, and water, ozone and hydrogen peroxide are contained, and ozone and hydrogen peroxide are dissolved in the water. A premixed solution is prepared.

The ozonizer 210 generates ozone water and supplies the generated ozone water to the downstream side of the reactor 112 of the water channel in the pipe 220. As a result, ozone water containing ozone, which produces a bactericidal factor and has a long life, is mixed with the prepared pre-mixing solution. Thereby, sterilizing water having high sterilizing power can be produced. The ozonizer 210 may be replaced by another type of ozone water supply unit.

The ozone water generated by the ozonizer 210 is supplied to the downstream side of the reactor 112 of the water channel in the pipe 220. As a result, it is possible to prevent the supplied ozone water from passing through the reactor 112 and to prevent the ozone contained in the ozone water from coming out of the ozone water due to the impact of cavitation applied to the supplied ozone water.

Although the present invention has been described in detail, the above description is exemplary in all aspects and the invention is not limited thereto. It is understood that innumerable variations not illustrated can be assumed without departing from the scope of the present invention.

100,201,300 Sterilized water production equipment 110 Circular tube 112 Reactor 114 Cooler 116 Pump 130 Pulse power supply 170 Nozzle 180 Cavitation bubble 190 First electrode 192 Second electrode 200 Discharge plasma generation mechanism 210 Ozonizer 220 tube W water

Claims (14)

A member with an annular channel through which water circulates,
The nozzle that generates cavitation bubbles in the water and
A discharge plasma generation mechanism that generates discharge plasma in the space where the cavitation bubble is generated, and
A device for producing sterilized water. The discharge plasma generation mechanism is
The first electrode arranged in the space and
A second electrode arranged in the space and
A pulse power supply that applies a pulse voltage between the first electrode and the second electrode, and
The device for producing sterilized water according to claim 1. The apparatus for producing sterilized water according to claim 2, wherein the distance between the first electrode and the second electrode is 4 mm or more and 32 mm or less. The frequency of the pulse voltage is 10 kHz or less.
The peak voltage of the pulse voltage is 15 kV or less,
The apparatus for producing sterilized water according to claim 2 or 3, wherein the pulse width of the pulse voltage is 1 μsec or less in full width at half maximum. The device for producing sterilized water according to any one of claims 1 to 4, further comprising a cooler for cooling the water. The device for producing sterilized water according to any one of claims 1 to 5, further comprising a pump for giving a flow to the water. The sterilizing water production apparatus according to claim 6, wherein the discharge pressure of the pump is 0.1 MPa or more and 1.5 MPa or less. The apparatus for producing sterilizing water according to any one of claims 1 to 7, wherein the sterilizing water contains at least one radical selected from the group consisting of hydroxyl radicals and hydroperoxide radicals. A member having a branch water channel from the annular water channel to the outside of the sterilizing water production apparatus, and
An ozone water supply unit that supplies ozone water to the branch channel,
The apparatus for producing sterilized water according to any one of claims 1 to 8. A member with a water channel through which water flows
The nozzle that generates cavitation bubbles in the water and
A discharge plasma generation mechanism that generates discharge plasma in the space where the cavitation bubble is generated, and
An ozone water supply unit that supplies ozone water to the downstream side of the space of the water channel,
A device for producing sterilized water. The process of circulating a circular channel in water and
The step of generating a cavitation bubble in the water and
The process of generating discharge plasma in the space where the cavitation bubble is generated, and
A method for producing sterilized water. The step of producing sterilized water by the method for producing sterilized water according to claim 11 and
A step of bringing the sterilized water into contact with an object to change the object into a sterilized object.
A method of manufacturing a sterilized object. The process of letting water flow through the waterway,
The step of generating a cavitation bubble in the water and
The process of generating discharge plasma in the space where the cavitation bubble is generated, and
A step of supplying ozone water to the downstream side of the space of the water channel,
A method for producing sterilized water. A step of producing sterilized water by the method for producing sterilized water according to claim 13.
A step of bringing the sterilized water into contact with an object to change the object into a sterilized object.
A method of manufacturing a sterilized object.

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