KR20150132799A - Method for Fabricating the Oxygen Water and Oxygen Water Fabricating Apparatus - Google Patents

Abstract

An oxygen water producing method and an oxygen water producing device are provided. The present invention comprises: a body case; an internal water tank which primarily stores water fed from the outside in the body case; an oxygen water producing part which has a circulation pump in the middle of a cold water discharge line extended from the internal water tank, has an oxygen generator including an oxygen supply line connected to the cold water discharge line by the medium of a three-way valve, mixes cold water discharged through the cold water discharge line with oxygen, and produces oxygen water; a dissolving device which is connected to a first oxygen water circulation line to circulate the oxygen water by the medium of the three-way valve, and increases a rate of dissolved oxygen in the oxygen water; an external water tank which is connected to a second oxygen water circulation line extended from the dissolving device, is made of a transparent material and is partially exposed to the outer surface of the body case, and is connected to the internal water tank by the medium of a third oxygen water circulation line to supply the oxygen water to the internal water tank; and a controller which controls the operation of a cooling coil installed on the internal water tank based on a value measured by a temperature sensor directly or indirectly measuring the temperature of the oxygen water stored in the internal water tank and controls the operation of the oxygen generator.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an oxygen-

The present invention relates to an apparatus and a method for producing oxygen water, and more particularly, to an apparatus and a method for producing oxygen water, which are produced according to Henry's law, in which oxygen is dissolved more as the water pressure is increased, and three or more fine filters As a method for producing oxygen water dissolved at a high concentration, the present invention is not limited to simply increasing the dissolution rate of oxygen by using the pressure of water, but keeping the concentration and content of oxygen water constant To an oxygen water producing apparatus and a method of producing oxygen water, which prevent a fresh sensation inherent to oxygen water from being alive and deteriorating taste.

It has been verified through various clinical trials that the human body must generally consume a certain amount of oxygen and that the oxygen intake in the human body is insufficient to cause various diseases and aging.

Water is the essential nutrient for life after oxygen in the human body. A person can survive for weeks without food, but can not live for days without water.

Human organisms normally receive 99% of their oxygen through the lungs and the rest through the skin. The air around us contains 20.9% oxygen, 78% nitrogen, 1% inert gas, so that if the nutrients are incompletely converted in the cells due to insufficient oxygen supply, the toxic metabolites such as lactic acid I make it. Separately, cells are swollen, further causing a decrease in circulatory capacity and an increase in oxygen deficiency in the tissues.

In general, there are two ways to consume oxygen: breathing and drinking water. Of these, drinking water is more effective because of the increased oxygen saturation and increased endurance Oxygen water experiment and US BEV system company 's oxygen water drinking experiment have been carried out in various journals. The dissolved oxygen which is ingested together with drinking water is compared with gas type oxygen ingested through respiratory lung, It has been found that the rate of absorption and transmission into each cell tissue is relatively 10 times faster than that of oxygen, and the amount thereof is closely related to the partial pressure of oxygen in the human body.

That is, when oxygen is supplied through the breath, the amount of oxygen accumulated in the liver of the body is within about 4.8%, but when oxygen is absorbed through the intestines, the amount of oxygen accumulated in the liver is 44% A variety of technologies have been developed to generate, store and maintain oxygenated water to dissolve oxygen and to dissolve dissolved oxygen in the water to a supersaturated state, thereby increasing the oxygen content of the water, which is 10 to 15 times higher than the dissolved oxygen concentration in general water Are variously filed as prior arts.

However, the PSA method, which is a prior art, has a problem in that it is difficult to miniaturize, the noise and the power consumption are high, and the membrane method has a problem of generating moisture and high noise, and the flat membrane method has problems in that moisture is generated, noise is high and durability is short Electrolytic method is reverse cleaning to remove electrolytic water left in the electrolytic cell after outgoing, but it can not completely remove the inactive materials such as OH radicals remaining in electrodes and diaphragm. It has high power consumption and short durability .

Although these oxygen generating techniques can dissolve oxygen so as to increase the amount of dissolved oxygen by forcibly supplying oxygen to the water, there are problems that preserve the nature inherent to the oxygen water and make it difficult for consumers to drink for a long time, Although it is newly designed and distributed, it can not properly maintain and maintain oxygen-water-specific properties.

Conventional oxygen generation techniques can generate various oxygen concentrations from a low concentration of 30 ppm to a high concentration of 80 ppm. However, as mentioned above, the problems include problems such as power consumption, noise, durability, and safety of materials, There is a clear limit to play a role as a generator suitable for maintaining the state constantly.

These prior arts are different in the type of the oxygen generating system, as to how to purify or purify the raw water, how to generate oxygen in the purified water or purified water, and how to dissolve and concentrate the generated oxygen There is no difference in the technical method of whether or not oxygen is stored and maintained for a long period of time.

 The prior art by PSA, membrane, flat membrane, electrolysis, etc. has been commonly used in water and liquid containers of water purifiers, water coolers, water bottles and food-related devices for a long time, Dissolved oxygen has been used in water tank and cold water tank of water purifier for a long time. However, Oxygen Dissolution Technology and Concentration Technology, which are to be combined with oxygen generation technology, have not developed a variety of technologies.

Therefore, the prior art methods are limited to oxygen generating concentration values and are repeated cycles in which the oxygen generator is operated and stopped. Thus, oxygen is supplied to the water to be stored, which is insufficient to preserve and maintain the unique state of oxygen water by dissolving and concentrating oxygen. This is clear.

(Patent Document 1) KR2003-0065913 A

(Patent Document 2) KR10-1136544 B

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a temperature sensor and an oxygen generator at a lower portion of a water reservoir to heat exchange water at a temperature rise in the outside air and a water reservoir, The oxygen generator and the circulation pump are operated at a low temperature when the water temperature is low and the amount of generated oxygen is increased to prevent the oxygen concentration from being lowered. Which is capable of easily generating and concentrating more oxygen water.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

In order to achieve the above-mentioned object, the present invention provides, as a specific means, An internal water reservoir for storing raw water introduced from the outside into the main body case; An oxygen generator having a circulation pump in the middle of the length of the cold water discharge line extending from the inner water storage tank and having an oxygen supply line connected to the cold water discharge line through a three way valve, An oxygen-water generating unit for generating oxygen water by mixing the oxygen- A dissolved oxygen supply unit connected to the first oxygen water circulation line through which oxygen is circulated through the three-way valve to increase the dissolved rate of dissolved oxygen in the oxygen water; A second oxygen water circulation line extending from the dissolution unit, a body part made of a transparent material is externally exposed on the outer surface of the body case, and a third oxygen water circulation And a temperature sensor for directly or indirectly measuring the temperature of the oxygen water stored in the inner water storage tank, wherein the temperature of the cooling water supplied to the inner water storage tank And a controller for controlling the operation of the oxygen generator and controlling the operation of the oxygen generator.

Further, the present invention provides a portable terminal comprising: a body case; An internal water reservoir for storing raw water introduced from the outside into the main body case; An oxygen generator having a circulation pump in the middle of the length of the cold water discharge line extending from the inner water storage tank and having an oxygen supply line connected to the cold water discharge line through a three way valve, An oxygen-water generating unit for generating oxygen water by mixing the oxygen- And an oxygen storage tank connected to the first oxygen water circulation line through which oxygen is circulated through the three-way valve and oxygen water having a high dissolved oxygen rate through the fourth oxygen water circulation line to the inner water tank A dissolving unit; And a second oxygen water circulation line extending from the inner water storage tank. The oxygen water discharge line is connected to the oxygen water discharge line, And controls the operation of the cooling coil provided in the internal water tank based on a value measured by a temperature sensor that directly or indirectly measures the temperature of the oxygen water stored in the internal water tank, And a controller for controlling the operation of the generator.

Preferably, the inner reservoir includes a main tank having a cooling lid wound on an outer surface thereof and having a tank lid covering an opening that is open at an upper portion thereof; and a main tank enclosing an outer surface of the main tank and covering an upper surface of the tank lid And a separating plate disposed inside the body tank. The separating plate is connected to a first outflow line provided on a bottom surface of the main tank, And a separator for separating the water-storing area of the raw water flowing from the outside and the water-storing area of the oxygen-dissolved oxygen into upper and lower parts.

More preferably, the separating plate has a first outflow line extending upward from the bottom surface of the main tank by a predetermined height, as an inner tube, and an inner discharge tube extending downward from the discharge hole of the separating plate by a predetermined length, .

Preferably, the dissolver includes a hollow cylindrical body communicating with an auxiliary oxygen supply line extending from the oxygen generator and having a plurality of compartments communicating with each other, and a filter medium formed of a porous plate and a fine mesh in the compartment A first oxygen water circulation line extending from the three-way valve, and a second oxygen water circulation line connected to the outer water tank.

Preferably, an inlet end of a second oxygen water circulation line connected to the outer water tank and supplied with oxygen water from the dissolved oxygen tank, an inlet end of a third oxygen water circulation line connected to the outer water tank and discharging oxygen water to the inner water tank, Is disposed near the uppermost end of the inner surface of the outer water tank so that oxygen water supply and oxygen water discharge can be performed without pressure loss at the full water level of the outer water tank.

Preferably, the inner reservoir is provided in the middle of the length of the third oxygen water circulation line connecting the outer reservoir and the inner reservoir, and the third oxygen water circulation line And has a clearance in which a first concentration line of a predetermined length having an inner diameter relatively smaller than the inner diameter of the line is disposed.

Preferably, the dissolver includes a hollow cylindrical body communicating with an auxiliary oxygen supply line extending from the oxygen generator and having a plurality of compartments communicating with each other, and a filter medium formed of a porous plate and a fine mesh in the compartment A first oxygen water circulation line extending from the three-way valve is connected to a lower end of the hollow cylindrical body, and a fourth oxygen water circulation line connected to the inner water storage tank is connected.

Preferably. And an outlet end of the fifth oxygen water circulation line connected to the outer water tank and supplied with oxygen water and an inlet end of the oxygen water discharge line connected to the outer water tank and discharging oxygen water, And is disposed near the uppermost end of the inner surface of the outer water tank so that oxygen water can be discharged.

Preferably. The inner reservoir is provided in the middle of the length of the fourth oxygen water circulation line connecting between the dissolved oxygen reservoir and the inner reservoir. The inner oxygen reservoir is disposed in the middle of the fourth oxygen water circulation line, And has a clearance in which a second concentration line of a predetermined length having a relatively small inner diameter is disposed.

According to another aspect of the present invention, there is provided a method of controlling an internal water supply system, A cold water discharge line extending from the inner water storage tank and having a circulation pump in the middle of the length thereof and an oxygen supply line extending from the oxygen generator via a three-way valve to connect the cold water discharged through the cold water discharge line to oxygen To produce oxygen water; Supplying oxygen water to the dissolved oxygen so that the dissolved oxygen ratio of the oxygen water discharged through the first oxygen water circulation line connected through the three-way valve can be increased, and passing the dissolved oxygen through the dissolved oxygen water; Connecting a second oxygen water circulation line extended from the dissolved oxygen storage tank to an external water storage tank provided on the outer surface of the body case so that a part of the body made of a transparent material is externally exposed; And supplying oxygen water to an internal water tank connected to a third oxygen water circulation line extending from the external water tank; And controls the operation of the cooling coil provided in the internal water storage tank based on a value measured by a temperature sensor that directly or indirectly measures the temperature of the oxygen water stored in the internal water storage tank, And a method of manufacturing oxygen water for controlling operation.

According to another aspect of the present invention, there is provided a method of controlling an internal water supply system, A cold water discharge line extending from the inner water storage tank and having a circulation pump in the middle of the length thereof and an oxygen supply line extending from the oxygen generator via a three-way valve to connect the cold water discharged through the cold water discharge line to oxygen To produce oxygen water; The oxygen water is forcedly supplied through a dissolved oxygen unit connected to the first oxygen water circulation line connected through the three-way valve, and the oxygen water dissolved in the oxygen water is increased through the fourth oxygen water circulation line extending from the dissolved water, To the inner reservoir; Connecting a fifth oxygen water circulation line extending from a lower end of the inner water tank to an outer water tank provided on an outer surface of the body case so that a part of the body made of a transparent material is exposed to the outside, And discharging the oxygenated water through an oxygen water discharge line extending from the external water storage tank; And controls the operation of the cooling coil provided in the internal water storage tank based on a value measured by a temperature sensor that directly or indirectly measures the temperature of the oxygen water stored in the internal water storage tank, And a method of manufacturing oxygen water for controlling operation.

Preferably. Wherein the step of storing the primary water in the inner water storage tank comprises the steps of: storing water in the water reservoir of the raw water flowing from the outside and water storage area of the oxygen water dissolved in oxygen, with the partition plate on which the main tank, Upper and lower are separated and stored.

More preferably. The oxygenated water stored in the lower region of the separator plate and cooled by the cooling coil is supplied to the cold water cooled to a temperature lower than the normal temperature by a circulation pump connected to the cold water discharge line extending downward from the main tank.

Preferably. Wherein the step of passing through the dissolved oxygen generator includes a plurality of compartments communicating with each other through the auxiliary oxygen supply line by connecting the auxiliary oxygen supply line extended from the oxygen generator and the dissolved oxygen generator, And supplying and dissolving oxygen into the hollow cylindrical body of the dissolver having the filter medium made therefrom.

Preferably. The second step of storing the oxygen water in the external water storage tank is to store and store the oxygen water of the dissolved water through the outlet end of the second oxygen water circulation line connected to the uppermost end of the inner surface of the external water storage tank, The oxygen water in the external water tank is supplied to the internal water tank through the inlet end of the third oxygen water circulation line connected to the inside water tank.

Preferably. Wherein the step of supplying oxygen water to the inner water storage tank is performed by circulating the oxygen water circulated through the third oxygen water circulation line from the outer water storage tank through the first concentration line where the inner diameter becomes relatively small, .

More preferably. Wherein the first concentration line is connected to at least two or more lines of a first outflow line, a second outflow line, and a cold water discharge line exposed through a clearance formed between a main tank of the inner reservoir and a heat insulating main body covering the outer surface thereof Wrapped.

Preferably. Wherein the step of storing the oxygen water in the outer water tank includes storing the oxygen water in the inner water tank through the outlet end of the fourth oxygen water circulation line connected to the upper end of the inner surface of the outer water tank, The oxygen water of the external water tank is supplied to the outside through the inlet end of the oxygen water discharge line connected to the outside.

Preferably. The step of supplying the oxygen water to the inner water tank may include passing the oxygen water circulated through the fourth oxygen water circulation line connecting the inner water tank and the dissolved water kneader through a second concentration line in which the inner pressure becomes relatively small, And circulated and supplied to the internal water tank.

More preferably. Wherein the second concentration line includes at least two lines out of a first outflow line, a cold water discharge line and a fifth circulation water line exposed through a clearance formed between a main tank of the inner reservoir and a heat insulating main body covering the outer surface thereof Respectively.

The present invention as described above has the following effects.

(1) circulating the water contained in the inner water tank based on the measured value of the temperature sensor provided in the inner water tank storing the raw water or the purified water, and dissolving the oxygen of the oxygen generator in the circulated water to generate oxygen water , The oxygen concentration and freshness of the oxygen water stored in the internal water storage tank can be maintained continuously by performing heat exchange so that the generated oxygen water is cooled and maintained at a constant temperature of 3 to 5 ° C. The dissolution rate of the oxygen-containing gas can be increased, and the oxygen water can be more easily generated and the oxygen concentration of the produced oxygen water can be maintained for a long time.

(2) By operating the oxygen generator and the circulation pump in a state of low water temperature based on the measured value of the temperature sensor which directly or indirectly measures the oxygen water stored in the inner water tank, oxygen is dissolved in the water at a temperature lower than the normal temperature The dissolved oxygen is firstly produced by increasing the dissolution rate and the oxygen generated in the first stage is forcibly supplied to the inside of the dissolved oxygen in the high pressure atmosphere and the oxygen water further dissolved in the water of oxygenated water The oxygen concentration can be increased while the oxygen water circulatingly supplied to the inner water storage tank passes through the concentration line where the inner diameter of the flow path is narrowed so that the generation, maintenance and storage of oxygen water can be sustained for a long time .

(3) The operating environment of the cooling coil for cooling the water stored in the inner water tank to a low temperature is linked with the operation timing of the oxygen generator, the circulating pump and the dissolver, thereby producing oxygen water at a low water temperature, Can be increased.

(4) Oxygen generated by dissolving oxygen in low-temperature cold water is circulated periodically in the internal water tank, circulation pump, dissolved water tank, external water tank and concentration line to maintain the inherent properties and concentration of oxygen water received in the internal water tank It is possible to extend the storage time of oxygenated water.

FIG. 1 is a schematic configuration diagram showing an oxygen-water producing apparatus according to a first embodiment of the present invention.
2 is an exploded perspective view showing an internal water tank employed in the oxygen water producing apparatus according to the first embodiment of the present invention.
3 is a cross-sectional view illustrating an internal water tank employed in the oxygen water producing apparatus according to the first embodiment of the present invention.
4 is a schematic configuration diagram showing an oxygen-water producing apparatus according to a second embodiment of the present invention.
5 is a cross-sectional view illustrating an internal water tank employed in the oxygen water producing apparatus according to the second embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to include an element does not exclude other elements unless specifically stated otherwise, but may also include other elements.

1 to 3, the oxygen-water producing system 100 according to the first embodiment of the present invention includes a body case 110, an internal water tank 120, an oxygen aquatic part 130, 140, an external water storage tank 150, and a controller 160.

The main body case 110 may be formed of a box structure having an internal space of a predetermined size so that the internal water tank 120 and the oxygen water aquatic part 130 are disposed inside the body case 110. The internal water tank 120, And a drinking water discharging portion 170 having at least one outlet so that the filtered or purified water can be discharged to the outside.

The internal water tank 120 includes a main body tank 121 having a substantially hollow cylindrical shape and disposed inside the main body case 110 so as to store a predetermined amount of raw water introduced from the outside. And may be made of the same metal material or a transparent glass material.

The inner water storage tank 120 is provided with a cooling coil 122 that circulates coolant to cool the water to a temperature lower than room temperature by transferring cool air to oxygen water as stored water.

That is, in the inner water storage tank 120, the cooling coil 122, in which the refrigerant circulates in operation of the compressor (not shown), is wound with a constant length on the outer surface, and has a tank cover 121a covering the opening A main body tank 121 and a heat insulating main body 123 which surrounds the outer surface of the main tank 121 and has a heat insulating lid 123a covering the upper surface of the tank lid 121a, (124a) formed in the separating plate (124) so as to be communicatively connected with the first outflow line (127) provided on the bottom surface of the main tank (121) And an internal discharge pipe 125 extending downward to a predetermined length so as to divide the water storage region of the raw water introduced from the outside and the water storage region of the dissolved oxygen into upper and lower portions.

The heat insulating main body 123 and the heat insulating lid 123a surrounding the main tank 121 may be made of a heat insulating material having a low heat transfer coefficient such as EPS (Expandable PolyStrene), which is a polymer material in which a foaming agent is added to a styrene polymer, But various insulating materials can be selectively employed.

The separator plate 124 may be provided in the shape of a large circle having the same or relatively small size as the inner diameter of the main tank 121.

The upper portion of the inner water tank 120 is provided with a raw water inlet 128 for receiving raw water from the outside and a raw water supply line 128a connected to the inlet side of the raw water inlet 128 is provided with an inflow It is preferable to have a filter unit 101 having a filter medium to filter out foreign matter contained in the raw water to be purified.

Accordingly, a certain amount of filtered water is stored in the inner water storage tank 120 while passing through the filter unit 101, and at the same time, the oxygen is dissolved while passing through the oxygen aquatic part 130, It is.

A water level sensor 129 is provided on the discharge side of the raw water inlet 128 so as to measure the level of the fluid such as raw water, purified water and oxygenated water filled in the internal water tank 120, And may be disposed vertically through a through hole 124b formed through the separator plate 124. [

The cooling coil 122 is disposed on the bottom surface of the separator plate 124 and the bottom surface of the main tank 121 so that oxygen water stored in the lower region of the separator plate 124 can be cooled to a low temperature lower than room temperature. It is preferable that windings are arranged on the outer surface of the main tank 121 corresponding to the space between them.

The separating plate 124 has a first outflow line 127 extending upward from the bottom surface of the main tank 121 by a predetermined height and serving as an inner tube and the first outflow line 127 extending from the discharge hole 124a of the separating plate 124 And an internal discharge pipe (125) extending downward in a predetermined length is connected as an external pipe by an insertion method.

The inner discharge pipe 125 may include a first hollow pipe having a cross section having an inner diameter reduced toward the bottom and a second hollow pipe having a constant inner diameter such that an extension pipe extending from the first water discharge line 127 is inserted. The height of the separating plate 124 may be appropriately adjusted according to the length of the extension pipe of the first outflow line and the length of the inner outlet pipe overlapping each other.

The temperature of the oxygen water that is filled between the upper portion of the main tank 121 and the separator plate 124 and is cooled by the cooling coil 122 corresponding to the lower region of the separator plate 124, The purified water or the raw water having a high temperature is supplied to the main body case through the first outflow line 127 and through the drinking water outlet 170 having the outlet 172 connected to the first outflow line 127 It can be externally discharged to enable drinking.

The inner water tank 120 communicates with the lower portion of the main tank 121 and is filled in the lower portion of the separator plate 124. The second water outlet line 122 discharges cold water cooled to a low temperature by the cooling coil 122, And the second outflow line 127a is connected to an outlet 172 provided outside the main body case 110 in the same manner as the first outflow line 127.

That is, the oxygen water stored in the lower region on the basis of the separation plate 124 and subjected to the low-temperature treatment is discharged through the second outflow line 127a provided in the lower portion of the main tank 121 of the internal water tank 120 And raw water or purified water stored in the upper region of the separator plate 124 is discharged through the first outflow line 127 so that the respective outlets 172 connected to the first and second outflow lines 127 and 127a, The user can select and drink the oxygen water in addition to the raw water or the filtered purified water.

The first outflow line 127 and the second outflow line 127a are provided with discharge pumps 113a and 113b which are operated when power is applied to discharge the raw water, purified water and cold water treated oxygen water to the discharge port 172 side And the discharge pumps 113a and 113b are electrically connected to the controller to select oxygen water or purified water according to the user's selection and discharge the water through the drinking water outlet 172. [

The oxygen-water generating unit 130 is installed in the lower portion of the separator plate 124 so as to discharge the oxygenated water from the main tank of the inner water storage tank 120 to the cold water cooled down to a temperature lower than the normal temperature. And a circulation pump 132 disposed in the middle of the length of the extended cold water discharge line 131.

A known oxygen generator 134 is provided in the body case 110 to generate oxygen when power is applied and an oxygen supply line 133 extending from the oxygen generator 134 is connected to the circulation pump 132 Way valve 133 provided in the middle of the length of the cold water discharge line 131 extending to the outlet of the first water pipe 131, and the three-way valve 133 is connected to the first water pipe 131 through which the oxygen- And is connected to the oxygen water circulation line 141.

It is preferable that the cold water discharge line 131 and the oxygen supply line 133 are provided with check valves so that cold water and oxygen can be supplied to the circulation pump 132 in one direction without flowing backward in the reverse direction.

Oxygen generated in the oxygen generator 134 and supplied through the oxygen supply line 133 is discharged from the circulation pump 132 which is a booster pump provided in the middle of the cold water discharge line 131, And the oxygen water generated by the supply pressure of the circulation pump 132 is supplied to the dissolved oxygen supply unit 140 at a supply pressure of a constant intensity, It can circulate and supply.

The dissolver 140 is connected to the first oxygen water circulation line 141 extending from the discharge end of the circulation pump 132, and the generated oxygen water is forcibly supplied to the inside, thereby increasing the oxygen dissolution rate of the oxygen water Oxygen is added to oxygen water to dissolve in a pressurized atmosphere.

The dissolver 140 includes a hollow cylindrical body 143 communicating with the auxiliary oxygen supply line 133b extending from the oxygen generator 134 and having a plurality of compartments communicating with each other, And a first oxygen water circulation line (141) extending from a discharge end of the circulation pump (132) is connected to a lower end of the hollow cylindrical body (143) And connects the second oxygen water circulation line 142 connected to the external water storage tank 150.

Accordingly, the oxygen water supplied into the hollow cylindrical body through the first oxygen water circulation line 141 passes through the filter medium 144 provided for each of the plurality of compartments in the hollow cylindrical body 143 Oxygen is further supplied and dissolved through the auxiliary oxygen supply line 133b so that oxygen is dissolved in the oxygen water in the pressurized and high-pressure atmosphere inside the hollow cylindrical body to increase the dissolved rate of oxygen, and at the same time, It is possible to increase the concentration ratio.

The outer water storage tank 150 is provided on the outer surface of the main body case 110 such that a part of the body made of a transparent material is exposed to the outside and a second oxygen water circulation line 142 extending from the dissolved water 140, And to store oxygenated water having increased oxygen dissolution rate and oxygen concentration ratio.

This oxygen water storage state can be easily confirmed by the user through the external water storage tank 150 which is made of a transparent material and can be observed through the inside, and at the same time, the dissolved oxygen is dissolved in the second solution while passing through the dissolver 140, And that the bubbles of the oxygen water whose oxygen concentration is increased are attached to the wall surface of the outer water tank can be visually confirmed, so that the reliability with respect to the produced oxygen water can be enhanced.

At this time, the external water storage tank 150 generates an internal pressure relatively higher than the atmospheric pressure by the oxygen water forced through the second oxygen water circulation line 142 by the circulating pumping force of the circulation pump 132 And a reservoir tank having an internal atmosphere.

The external water storage tank 150 is connected to the inside water storage tank 120 through a third oxygen water circulation line 151 so as to supply oxygen water supplied from the dissolved oxygen storage tank 140 and stored in the internal water storage tank 120, And communicates with the lower part of the water storage tank 120.

Here, an outlet end of the second oxygen water circulation line 142 connected to the external water tank to supply oxygen water into the external water tank 150 and an outlet end of the second oxygen water circulation line 142, It is preferable that the inlet end of the third oxygen water circulation line 151 connected to the outer water tank is disposed near the uppermost end of the inner surface of the outer water tank 150 so that oxygen water supply and oxygen water discharge can be performed without pressure loss at a high water level .

The controller 160 is electrically connected to a temperature sensor 165 that directly or indirectly measures the temperature of the oxygen water stored in the internal water reservoir and is electrically connected to an oxygen generator 134 for generating oxygen, To control the operation timing.

The controller 160 controls the temperature of the water to be treated discharged into the cold water discharge line 131 in the main tank 121 or the heat insulating main body 123 of the inner water tank 120 to generate oxygen water The operation of the refrigerant compressor connected to the cooling coil 122 provided in the internal water storage tank 120 is controlled based on the measured value of the temperature sensor 165 directly or indirectly measured, And controls the operation timing of the oxygen generator 134 that supplies oxygen to the oxygen supply line 133 connected to the cold water discharge line 131 via the three-way valve.

That is, according to Le Chatelier's Principle that the oxygen in the gaseous state in the process of generating oxygen water is dissolved in the water of the treated water depending on the temperature of the water (Le Chatelier's Principle) When the temperature is low, the oxygen gas dissolves in the liquid water. When the temperature is low, the oxygen gas is low. When the temperature is low, It is dissolved.

Accordingly, the refrigerant compressor connected to the cooling coil is operated in accordance with the measured value of the temperature sensor 165 for measuring the temperature of the water to be treated stored in the inner water tank 120, And the operation of the oxygen generator is interlocked with the operation of maintaining the cooling temperature at which the dissolution of oxygen most ideally is maintained so that the cold water supplied to the circulation pump 132 side through the cold water discharge line 131 is supplied with oxygen The dissolution of oxygen supplied through the oxygen supply line 133 of the generator can be performed at a relatively high level as compared with the room temperature so that oxygen water having a high oxygen dissolution rate can be produced.

The operation of the refrigeration compressor connected to the cooling coil 122 by the controller 160 and the operation of the oxygen generator 134 are interlocked in the process of generating oxygen water by the operation of the circulation pump 132, The water to be treated stored in the lower part of the separating plate of the inner water tank is cooled to a low temperature state of 3 to 5 DEG C and the cooling temperature of the treated water can be maintained under the optimum condition for generating oxygen water, And circulated and supplied to the dissolver.

The inner water storage tank 120 is provided in the middle of the third oxygen water circulation line 151 connecting the outer water storage tank and the inner water storage tank, And a clearance space S in which a first concentration line 151a having a predetermined length having an inner diameter relatively smaller than the inner diameter of the third oxygen water circulation line 151 is disposed.

The clearance space S is formed in the space between the main tank 121 and the heat insulating main body 123 at a predetermined depth in the upper surface of the heat insulating main body facing the lower portion of the main tank, The first condensing line 151a is connected to the first water discharging line 127, the second water discharging line 127a and the cold water discharging line 127 exposed between the main tank 121 and the heat insulating main body 123 of the inner water tank 120 131).

Accordingly, the oxygen water that is pressurized by the supply pressure of the circulation pump from the outer water storage tank 150 toward the inner water storage tank 120 and supplied in one direction flows through the third oxygen water circulation line 151 having a relatively large inner diameter The inner diameter of the passage becomes relatively small, and the air passes through the first concentration line 151a in which the internal pressure is increased, and is circulated and stored in the internal water storage tank 120 to be stored.

At this time, since the unoxidized oxygen gas that is not combined with the water of the oxygen water is dissolved in water due to the increase of the internal pressure due to the reduction of the flow path, the water in the inner water tank 120 passes through the first concentration line 151a, Thereby increasing the oxygen concentration of the oxygen water stored.

The first concentration line 151a provided at the middle of the third oxygen water circulation line 151 is preferably made of a PE tube having an inner diameter of 0.3 to 1.0 mm

When the supply pressure of the circulation pump is 130 PSI or less, the first condensing line 151a is a total length of the first condensing line 151a, which is wound around the free space, based on the pressure of the circulation pump 132, Is set to be 1 to 1.5 m, and when it is 130 PSI or more, it is preferably set to be 2 to 3 m.

By the structure and the method of dissolving oxygen in the oxygen water to increase the oxygen dissolution rate and to further increase the oxygen concentration ratio of the unoxidized oxygen remaining in the oxygen water by the high pressure atmosphere, oxygen generated by the oxygen generator and the circulating pump It is possible to improve the method of storing and maintaining the oxygen water stored in the internal water storage tank for a long time without limiting to the simple production of water so that the user can always drink fresh while maintaining the property inherent in living oxygen water .

4 and 5, the oxygen-water producing apparatus 100a according to the second embodiment of the present invention includes a main body case 110, an internal water storage tank 120, an oxygen- A controller 130, a dissolver 140, an external water tank 150, and a controller 160. The same components are denoted by the same reference numerals, and a detailed description thereof will be omitted.

The dissolver 140 is connected to the first oxygen water circulation line 141 extending from the discharge end of the circulation pump 132, and the generated oxygen water is forcibly supplied to the inside, thereby increasing the oxygen dissolution rate of the oxygen water Oxygen is added to oxygen water to dissolve in a pressurized atmosphere.

This dissolver 140 is connected to an auxiliary oxygen supply line (not shown) extending from the oxygen generator 134 as in the first embodiment, and is connected through the first oxygen water circulation line 141 The oxygen supplied to the inside of the hollow cylindrical body passes through the filter medium provided for each of the plurality of compartments in the hollow cylindrical body so that oxygen further supplied through the auxiliary oxygen supply line is pressurized in the hollow cylindrical body, To increase the oxygen dissolution rate of oxygen water and to increase the oxygen concentration ratio.

The dissolved oxygen is dissolved in the dissolved oxygen and the oxygen concentration is increased through the fourth oxygenated water circulation line 149 by passing through the dissolved oxygen, And can be supplied to the inside of the internal water tank 120.

The outer water storage tank 150 includes a fifth oxygen water circulation line 152 extending from a lower end of the inner water storage tank and having a body part made of a transparent material exposed to the outside on the outer surface of the main body case 110, And the oxygen water stored in the internal water storage tank is supplied to the second water storage tank.

The oxygen water is stored in a transparent state through the external water tank 150, which can be easily observed by the user through the external water tank 150. The dissolved oxygen is dissolved in the oxygen water while passing through the dissolved water 140, It is possible to visually confirm that the bubbles of the oxygen water having the increased oxygen concentration ratio adhere to the wall surface of the outer water storage tank 150, so that the reliability with respect to the produced oxygen water can be enhanced.

At this time, the second oxygen water circulation line 142 is connected to the external water storage tank 150 by a pumping force of a circulation pump (not shown) for supplying oxygen water provided in the middle of the fifth oxygen water circulation line 152, It is preferable that the external water storage tank 150 is made of a water storage tank having an internal atmosphere so that an internal pressure relatively higher than atmospheric pressure is generated.

The outer water storage tank 150 is connected to the inlet end of the oxygen water discharge line 153 connected to the drinking water discharge unit 170 provided on the outer surface of the main body case 110 and the oxygen storage water And to discharge it to the outside so as to be able to drink.

Here, an outlet end of the fifth oxygen water circulation line 152 connected to the outer water tank to supply oxygen water into the outer water tank 150, and an outlet end of the fifth oxygen water circulation line 152 connected to the outlet of the outer water tank 150, It is preferable that the inlet end of the oxygen water discharge line 153 connected to the external water storage tank is disposed near the uppermost end of the inner surface of the outer water storage tank 150 so that oxygen water supply and oxygen water discharge can be performed without pressure loss at a full water level.

It is preferable that the oxygen water discharge line 153 is provided with a circulation pump 153a for discharging oxygen water so that the oxygen water stored in the external water tank can be discharged to the outside, And an oxygen sensor 157 which has an emission source 158 such as an LED that generates light upon power application and measures the oxygen concentration of the oxygen stored in the secondary storage. 153a, the light emitting source 158, and the oxygen sensor 157 are electrically connected to the controller 160. [

The controller 160 is electrically connected to a temperature sensor 165 for directly or indirectly measuring the temperature of the oxygen water stored in the internal water reservoir and includes an oxygen generator 134 and a circulation pump 132 for generating oxygen, And they are electrically connected to control the operation timing thereof.

The controller 160 controls the temperature of the water to be treated discharged into the cold water discharge line 131 in the main tank 121 or the heat insulating main body 123 of the inner water tank 120 to generate oxygen water The operation of the refrigerant compressor connected to the cooling coil 122 provided in the internal water storage tank 120 is controlled based on the measured value of the temperature sensor 165 directly or indirectly measured, And controls the operation timing of the oxygen generator 134 that supplies oxygen to the oxygen supply line 133 connected to the cold water discharge line 131 via the three-way valve 133a.

That is, according to Le Chatelier's Principle that the oxygen in the gaseous state in the process of generating oxygen water is dissolved in the water of the treated water depending on the temperature of the water (Le Chatelier's Principle) When the temperature is low, the oxygen gas dissolves in the liquid water. When the temperature is low, the oxygen gas is low. When the temperature is low, It is dissolved.

In order to measure the temperature of the water to be treated stored in the inner water tank 120, the refrigerant compressor connected to the cooling coil is operated in accordance with the measured value of the temperature sensor 165 provided on the bottom surface or the side wall of the inner water tank The water stored in the inner water tank is cooled to 3 to 5 DEG C and the operation of the oxygen generator is interlocked with the operation of maintaining the cooling temperature at which oxygen dissolution is most ideal so as to circulate through the cold water discharge line 131 The dissolution of oxygen supplied through the oxygen supply line 133 of the oxygen generator to the cold water supplied to the pump 132 side can be performed relatively higher than the room temperature so that oxygen water having a high oxygen dissolution rate can be generated.

In the process of generating oxygen water by mixing the cold water of the cold water discharge line 133 connected to the circulation pump 132 and the oxygen of the oxygen supply line 133, the controller 160 controls the cooling coil 122 And the operation of the oxygen generator 134 are interlocked with each other so that the for-treatment water stored in the lower part of the separating plate of the internal water storage tank is cooled to a low temperature state of 3 to 5 ° C, Oxygen water having an oxygen solubility of 80 ppm or more can be generated and circulated and supplied to the above-mentioned dissolved water because the cooling temperature of the treated water can be maintained under optimum conditions.

The inner water tank 120 is provided in the middle of the fourth oxygen water circulation line 149 connecting the dissolved water tank 140 and the inner water tank 120. The oxygen water supplied to the inner water tank (S) in which a second concentration line 149a having a predetermined length having an inner diameter relatively smaller than the inner diameter of the fourth oxygen water circulation line 149 is disposed so as to narrow the passage through which the inner pressure can be raised, ).

The clearance space S is formed in the space between the main tank 121 and the heat insulating main body 123 at a predetermined depth in the upper surface of the heat insulating main body facing the lower portion of the main tank, The second concentration line 149a is connected to the first water supply line 127, the cold water discharge line 131, and the fifth oxygen water circulation path 127, which are exposed between the main tank 121 and the heat insulating main body 123 of the inner water tank 120, It is preferable that the lines 152 are wound around at least two lines.

Accordingly, the oxygen water supplied by the supply pressure of the circulation pump from the dissolver 140 to the inner water storage tank 120 in one direction flows through the fourth oxygen water circulation line 149 having a relatively large inner diameter, The inner diameter of the flow passage becomes relatively small, and is supplied to the inner water storage tank 120 through the second concentration line 149a where the internal pressure is increased, and is stored.

At this time, since the unoxidized oxygen gas which is not combined with the water of the oxygen water is dissolved in the water due to the increase of the internal pressure due to the reduction of the flow path, the water in the inner water tank 120 passes through the second concentration line 149a, Thereby increasing the oxygen concentration of the oxygen water stored.

The second concentration line 149a provided in the middle of the fourth oxygen water circulation line 149 is made of a PE tube tube having an inner diameter of 0.3 to 1.0 mm like the first concentration line, When the supply pressure of the circulation pump is 130 PSI or less based on the pressure of the circulation pump 132, which is a booster pump circulating and supplying, the total length wound around the clearance space is 1 to 1.5 m, To 3 m.

By the structure and the method of dissolving oxygen in the oxygen water to increase the oxygen dissolution rate and to further increase the oxygen concentration ratio of the unoxidized oxygen remaining in the oxygen water by the high pressure atmosphere, oxygen generated by the oxygen generator and the circulating pump It is possible to improve the method of storing and maintaining the oxygen water stored in the internal water storage tank for a long time without limiting to the simple production of water so that the user can always drink fresh while maintaining the property inherent in living oxygen water .

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be apparent to those of ordinary skill in the art.

110: Body case
120: internal water tank
121: main tank
122: cooling coil
123:
124: separation plate
125: Internal discharge pipe
126:
127: 1st outflow line
127a: Second outgoing line
130: Oxygen water generator
131: cold water discharge line
132: circulation pump
133: oxygen supply line
134: Oxygen generator
140:
141: first oxygen water circulation line
142: Second oxygenated water circulation line
149: Fourth oxygenated water circulation line
150: External reservoir
151: Third oxygenated water circulation line
151a: first enrichment line
152: Fifth oxygenated water circulation line
153: Oxygen water discharge line
160:
165: Temperature sensor

Claims (21)

Body case;
An internal water reservoir for storing raw water introduced from the outside into the main body case;
An oxygen generator having a circulation pump in the middle of the length of the cold water discharge line extending from the inner water storage tank and having an oxygen supply line connected to the cold water discharge line through a three way valve, An oxygen-water generating unit for generating oxygen water by mixing the oxygen-
A dissolved oxygen supply unit connected to the first oxygen water circulation line through which oxygen is circulated through the three-way valve to increase the dissolved rate of dissolved oxygen in the oxygen water;
A second oxygen water circulation line extending from the dissolution unit, a body part made of a transparent material is externally exposed on the outer surface of the body case, and a third oxygen water circulation An external water reservoir connected to the internal water reservoir through a line;
The operation of the cooling coil provided in the internal water storage tank is controlled based on a value measured by a temperature sensor that directly or indirectly measures the temperature of the oxygen water stored in the internal water storage tank, And a controller. Body case;
An internal water reservoir for storing raw water introduced from the outside into the main body case;
An oxygen generator having a circulation pump in the middle of the length of the cold water discharge line extending from the inner water storage tank and having an oxygen supply line connected to the cold water discharge line through a three way valve, An oxygen-water generating unit for generating oxygen water by mixing the oxygen-
And an oxygen storage tank connected to the first oxygen water circulation line through which oxygen is circulated through the three-way valve and oxygen water having a high dissolved oxygen rate through the fourth oxygen water circulation line to the inner water tank A dissolving unit;
And a second oxygen water circulation line extending from the inner water storage tank. The oxygen water discharge line is connected to the oxygen water discharge line, An external water tank for discharging the water
The operation of the cooling coil provided in the internal water storage tank is controlled based on a value measured by a temperature sensor that directly or indirectly measures the temperature of the oxygen water stored in the internal water storage tank, And a controller. 3. The method according to claim 1 or 2,
Wherein the inner water storage tank includes a main tank having a cooling lid wound on an outer surface thereof and having a tank lid covering an opening portion opened at an upper portion thereof and a heat insulating lid surrounding the outer surface of the main tank and covering the upper surface of the tank lid And an internal discharge pipe extending downward from the discharge hole formed in the partition plate so as to be communicatively connected with the first water discharge line provided on the bottom surface of the main tank, And separating means for separating the water-storing region of the raw water flowing from the outside and the water-storing region of the oxygen-dissolved oxygen into upper and lower portions. The method of claim 3,
Wherein the separating plate has a first outflow line extending upward from the bottom surface of the main tank by a predetermined height as an inner pipe and an inner discharge pipe extending downward from the discharge hole of the separating plate by a predetermined length as an outer pipe, And the oxygen-containing gas is supplied to the oxygen-containing gas. The method according to claim 1,
Wherein the dissolved oxygen generator includes a hollow cylindrical body communicating with an auxiliary oxygen supply line extended from the oxygen generator and having a plurality of compartments communicating with each other, and a filter member formed of a porous plate and a fine mesh inside the compartment, A first oxygen water circulation line extending from the valve is connected to a second oxygen water circulation line connected to the external water tank. The method according to claim 1,
An inlet end of a second oxygen water circulation line connected to the outer water tank and supplied with oxygen from the dissolved oxygen tank and an inlet end of a third oxygen water circulation line connected to the outer water tank and discharging oxygen water to the inner water tank, Wherein the oxygen storage tank is disposed near the uppermost end of the inner surface of the outer water tank so that oxygen water supply and oxygen water discharge can be performed without pressure loss at a full water level of the water storage tank. The method according to claim 1,
The inner water storage tank is provided in the middle of the third oxygen water circulation line connecting the outer water storage tank and the inner water storage tank, and has an inner diameter of the third oxygen water circulation line And a clearance space in which a first concentration line of a predetermined length having a relatively small inner diameter is disposed. 3. The method of claim 2,
Wherein the dissolved oxygen generator includes a hollow cylindrical body communicating with an auxiliary oxygen supply line extending from the oxygen generator and having a plurality of compartments communicating with each other, and a filter medium formed of a porous plate and fine irons in the compartment, A first oxygen water circulation line extending from the three-way valve is connected to a lower end of the cylindrical body, and a fourth oxygen water circulation line connected to the inner water tank is connected. 3. The method of claim 2,
And an outlet end of the fifth oxygen water circulation line connected to the outer water tank and supplied with oxygen water and an inlet end of the oxygen water discharge line connected to the outer water tank and discharging oxygen water, And the oxygen water is disposed near the uppermost end of the inner surface of the outer water tank so that the oxygen water can be discharged. 3. The method of claim 2,
The inner reservoir is provided in the middle of the length of the fourth oxygen water circulation line connecting between the dissolved oxygen reservoir and the inner reservoir. The inner oxygen reservoir is disposed in the middle of the fourth oxygen water circulation line, And a clearance space in which a second concentration line of a predetermined length having a relatively small inner diameter is disposed. Storing primary raw water introduced from the outside into an internal water tank of a main body case;
A cold water discharge line extending from the inner water storage tank and having a circulation pump in the middle of the length thereof and an oxygen supply line extending from the oxygen generator via a three-way valve to connect the cold water discharged through the cold water discharge line to oxygen To produce oxygen water;
Supplying oxygen water to the dissolved oxygen so that the dissolved oxygen ratio of the oxygen water discharged through the first oxygen water circulation line connected through the three-way valve can be increased, and passing the dissolved oxygen through the dissolved oxygen water;
Connecting a second oxygen water circulation line extended from the dissolved oxygen storage tank to an external water storage tank provided on the outer surface of the body case so that a part of the body made of a transparent material is externally exposed; And
Supplying oxygen water to an internal water tank connected to a third oxygen water circulation line extending from the external water tank; Lt; / RTI >
The operation of the cooling coil provided in the internal water storage tank is controlled based on a value measured by a temperature sensor that directly or indirectly measures the temperature of the oxygen water stored in the internal water storage tank, ≪ / RTI > Storing primary raw water introduced from the outside into an internal water tank of a main body case;
A cold water discharge line extending from the inner water storage tank and having a circulation pump in the middle of the length thereof and an oxygen supply line extending from the oxygen generator via a three-way valve to connect the cold water discharged through the cold water discharge line to oxygen To produce oxygen water;
The oxygen water is forcedly supplied through a dissolved oxygen unit connected to the first oxygen water circulation line connected through the three-way valve, and the oxygen water dissolved in the oxygen water is increased through the fourth oxygen water circulation line extending from the dissolved water, To the inner reservoir;
Connecting a fifth oxygen water circulation line extending from a lower end of the inner water tank to an outer water tank provided on an outer surface of the body case so that a part of the body made of a transparent material is exposed to the outside, And
Discharging oxygen water through an oxygen water discharge line extending from the external water tank; Lt; / RTI >
The operation of the cooling coil provided in the internal water storage tank is controlled based on a value measured by a temperature sensor that directly or indirectly measures the temperature of the oxygen water stored in the internal water storage tank, ≪ / RTI > 13. The method according to claim 11 or 12,
Wherein the step of storing the primary water in the inner water storage tank comprises the steps of: storing water in the water reservoir of the raw water flowing from the outside and water storage area of the oxygen water dissolved in oxygen, with the partition plate on which the main tank, And separating the upper and lower portions of the oxygen water. 14. The method of claim 13,
And oxygen water that is stored in a lower region of the separator plate and is subjected to cold water treatment by the cooling coil is supplied to cold water cooled to a temperature lower than normal temperature by a circulation pump connected to a cold water discharge line extending downward from the main tank By weight. 13. The method according to claim 11 or 12,
Wherein the step of passing through the dissolved oxygen generator includes a plurality of compartments communicating with each other through the auxiliary oxygen supply line by connecting the auxiliary oxygen supply line extended from the oxygen generator and the dissolved oxygen generator, Further comprising the step of supplying and dissolving oxygen into the interior of the hollow cylindrical body of the dissolver having the filter material formed therein. 12. The method of claim 11,
The second step of storing the oxygen water in the external water storage tank is to store and store the oxygen water of the dissolved water through the outlet end of the second oxygen water circulation line connected to the uppermost end of the inner surface of the external water storage tank, Wherein oxygen water in the outer water tank is supplied to the inner water tank through the inlet end of the third oxygen water circulation line connected to the inner water tank. 12. The method of claim 11,
Wherein the step of supplying oxygen water to the inner water storage tank is performed by circulating the oxygen water circulated through the third oxygen water circulation line from the outer water storage tank through the first concentration line where the inner diameter becomes relatively small, Wherein the oxygen-containing gas is supplied to the oxygen-containing gas. 18. The method of claim 17,
Wherein the first concentration line is connected to at least two or more lines of a first outflow line, a second outflow line, and a cold water discharge line exposed through a clearance formed between a main tank of the inner reservoir and a heat insulating main body covering the outer surface thereof Wherein the oxygen-containing solution is wound and disposed. 13. The method of claim 12,
Wherein the step of storing the oxygen water in the outer water tank includes storing the oxygen water in the inner water tank through the outlet end of the fourth oxygen water circulation line connected to the upper end of the inner surface of the outer water tank, Wherein oxygen water in the external water storage tank is supplied to the outside through an inlet end of an oxygen water discharge line connected to the oxygen storage tank. 13. The method of claim 12,
The step of supplying the oxygen water to the inner water tank may include passing the oxygen water circulated through the fourth oxygen water circulation line connecting the inner water tank and the dissolved water kneader through a second concentration line in which the inner pressure becomes relatively small, And is circulated and supplied to the internal water tank. 21. The method of claim 20,
Wherein the second concentration line includes at least two lines out of a first outflow line, a cold water discharge line and a fifth circulation water line exposed through a clearance formed between a main tank of the inner reservoir and a heat insulating main body covering the outer surface thereof Wherein the oxygen-containing gas is supplied to the oxygen-containing gas.

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