JP7580107B2 - Hydrogen water production device and hydrogen water production method - Google Patents

Description

The present invention relates to a hydrogen water production device and method for producing hydrogen water by dissolving hydrogen in water, and in particular to a hydrogen water production device and method that can continuously extract hydrogen water from supplied water.

The efficacy of hydrogen water, which is water in which hydrogen is dissolved, has been reported. Here, at a temperature of 25°C and 1 atmosphere, hydrogen gas (hereinafter simply referred to as "hydrogen") can only be dissolved in 1 liter of water to a concentration of 1.57 mg, or about 1.6 ppm. This is a very small amount compared to dissolving other gases, such as carbon dioxide gas or oxygen gas, in water. Therefore, it was considered to maintain a two-phase gas-liquid state in a dissolution tank in which water and hydrogen coexist in a closed space with increased pressure, and to increase the solubility (saturation concentration) according to Henry's law. On the other hand, if the hydrogen water is taken out of the dissolution tank into the atmosphere, the pressure returns to normal and the solubility also decreases, so hydrogen is released from the hydrogen water into the atmosphere all at once, and the concentration decreases to below the saturation concentration.

For example, Patent Document 1 discloses a gas dissolution device that applies viscous resistance to water from a dissolution tank through a thin, long capillary tube, gradually reducing the pressure inside the capillary tube to prevent hydrogen from escaping from the water, and extracts hydrogen water into the atmosphere. This device describes how water and hydrogen from a tank are pumped into a dissolution tank, where the hydrogen is dissolved in the water while being maintained in a two-phase gas-liquid state at a pressure higher than atmospheric pressure, while hydrogen water is again guided from the dissolution tank through the capillary tube back into the tank, turning the water in the tank into hydrogen water with hydrogen dissolved in it at a concentration higher than the solubility (saturation concentration).

On the other hand, devices have been proposed that can continuously extract hydrogen water from tap water provided to ordinary households or from mineral water in tanks.

Patent Document 2 discloses a gas dissolving device that forms a pressurizing section that pressurizes liquid through a water pipe, provides a gas injection section that injects a gas such as hydrogen into a flow path connected to the water pipe, creates a two-phase gas-liquid state at a pressure higher than atmospheric pressure, and can extract water with dissolved gas through a pressure reducing section equipped with a pressure adjustment valve. Here, the pressure reducing section can be a pipe of a length that causes pressure loss, and water can be continuously extracted as hydrogen water. In addition, because a pump is not used, the device structure can be simplified and the number of valve mechanisms as a drive section can be reduced, reducing the chance of breakdowns.

JP 2016-101585 A JP 2008-188574 A

As described above, when water and hydrogen are put into a gas-liquid two-phase state at a pressure higher than atmospheric pressure using a dissolution tank, the solubility of hydrogen in water can be increased compared to that in the atmosphere according to Henry's law. On the other hand, when attempting to extract water with dissolved hydrogen while supplying water to the dissolution tank, the concentration of hydrogen dissolved in the extracted water tends to be lower than when water with dissolved hydrogen is extracted without supplying water. Therefore, it has been considered to reduce the amount of water supplied per hour and extend the time that water is retained in the dissolution tank in a gas-liquid two-phase state, so that hydrogen is sufficiently dissolved in the water before it is extracted, but this reduces productivity. In addition, parameters such as the pressure of the dissolution tank, the amount of water, and the amount of water supplied and extracted per unit time are interrelated, making it difficult to stabilize the hydrogen concentration of the extracted hydrogen water.

The present invention was made in consideration of the above circumstances, and its purpose is to provide a hydrogen water production device and method that can continuously extract hydrogen water from supplied water, has excellent productivity, and can obtain hydrogen water with a stable hydrogen concentration.

The hydrogen water production device according to the present invention is a hydrogen water production device that has an upper pipeline and a lower pipeline at the top and bottom of a dissolution tank made of a hollow cylindrical sealed container, supplies water from the upper pipeline into the inside of the tank, creates a two-phase coexistence state with hydrogen at a pressure higher than atmospheric pressure, and extracts the water as hydrogen water from the lower pipeline. The device includes a plurality of dissolution tanks connected in series by sequentially connecting the lower pipeline to the upper pipeline from upstream to downstream, connects a water supply pipe to the inlet pipeline, which is the upper pipeline of the most upstream dissolution tank, and creates a pressure loss inside the outlet pipeline, which is the lower pipeline of the most downstream dissolution tank, to extract water to the outside while maintaining the two-phase coexistence state in all of the dissolution tanks at the water supply pressure T of the inlet pipeline.

With these features, the dissolution tank to which water is supplied from the outside and the dissolution tank from which hydrogen water is extracted to the outside are separated, making it possible to produce hydrogen water with a stable hydrogen concentration with good productivity.

In the above-mentioned invention, a hydrogen supply pipe from a hydrogen supply mechanism may be connected to the inlet pipe, and hydrogen and/or water may be supplied to the dissolution tank located at the most upstream. With this feature, the gas phase inside the multiple dissolution tanks can be filled with hydrogen using a simple mechanism, and hydrogen water with a stable hydrogen concentration can be obtained with good productivity.

In the above invention, the inlet pipe and the outlet pipe may each be provided with a flow valve, and the flow rate of water flowing through the inlet pipe and the outlet pipe per unit time may be controlled to be equal. With this feature, hydrogen water with a stable hydrogen concentration can be continuously and productively obtained.

In the above-mentioned invention, the extraction pipe may be a tubular passage having a diameter and length that generates viscous resistance so as to provide a pressure loss equal to the pressure difference between the pressure in the dissolution tank at the most upstream and atmospheric pressure. With this feature, hydrogen water with a stable hydrogen concentration can be continuously and productively obtained without using a driving mechanism such as a valve for pressure adjustment.

In the above invention, the inlet pipe may be provided with a water supply pressure regulating valve, and the water supply pressure T may be adjusted to be lower than the water supply pressure from the water supply pipe. With this feature, hydrogen water with a stable hydrogen concentration can be continuously and productively obtained, regardless of the supply pressure of the tap water supplied.

In the above-mentioned invention, the dissolution tank may be characterized by comprising three tanks: a hydrogen dissolution tank at the most upstream, a hydrogen concentration holding tank at the most downstream, and a pressure adjustment tank between them for adjusting the pressure. With this characteristic, hydrogen water with a stable hydrogen concentration can be continuously and productively obtained using a simple device.

In the above-mentioned invention, the pressure-adjusting dissolution tank may be characterized by containing a porous filter. With this characteristic, hydrogen water with a stable hydrogen concentration can be continuously and productively obtained.

In the above invention, the hydrogen dissolving tank may be characterized by housing a carbon filter. With this characteristic, hydrogen water with a stable hydrogen concentration suitable for drinking can be continuously and productively obtained.

The method for producing hydrogen water according to the present invention is a method for producing hydrogen water by providing an upper pipeline and a lower pipeline at the top and bottom of a dissolution tank consisting of a hollow cylindrical sealed container, supplying water from the upper pipeline into the inside of the tank and creating a two-phase coexistence state with hydrogen at a pressure higher than atmospheric pressure, and extracting the water as hydrogen water from the lower pipeline. The method is characterized in that for a plurality of dissolution tanks connected in series by sequentially connecting the lower pipelines to the upper pipeline from upstream to downstream, water is supplied from the inlet pipe, which is the upper pipeline of the most upstream dissolution tank, and water is extracted to the outside by applying a pressure loss inside the outlet pipe, which is the lower pipeline of the most downstream dissolution tank, while maintaining the two-phase coexistence state in all of the dissolution tanks at the water supply pressure T of the inlet pipe.

With these features, the dissolution tank to which water is supplied from the outside and the dissolution tank from which hydrogen water is extracted to the outside are separated, making it possible to produce hydrogen water with a stable hydrogen concentration with good productivity.

In the above-mentioned invention, the outlet pipe is opened and all of the dissolution tanks are empty, then hydrogen is supplied from the inlet pipe to fill the dissolution tanks with hydrogen, the supply of hydrogen is stopped and the outlet pipe is closed, the dissolution tanks are pressurized with water supplied from the inlet pipe, and all of the dissolution tanks are brought into a two-phase coexistence state at the water supply pressure T of the inlet pipe. According to this feature, the insides of multiple dissolution tanks are purged with hydrogen, and hydrogen water with a stable hydrogen concentration can be obtained with good productivity.

In the above-mentioned invention, the flow rate of water flowing through the inlet pipe and the outlet pipe per unit time may be made equal. With this feature, hydrogen water with a stable hydrogen concentration can be continuously and productively obtained.

1 is a block diagram of a hydrogen water production device according to a representative example of the present invention. FIG. 2 is a side view of the main part of the hydrogen water production device. FIG. 2 is a side view of the main part of the hydrogen water production device. FIG. 2 is a side view of the main part of the hydrogen water production device.

The hydrogen water production device and the hydrogen water production method using the same according to the present invention will be specifically described below with reference to Figures 1 to 3.

As shown in FIG. 1, the hydrogen water production device 10 has multiple dissolution tanks and can continuously produce hydrogen water by supplying water at a pressure higher than atmospheric pressure, for example by connecting it to a water supply.

The water path will be described in order. First, the water supply pipe 1 that supplies water is connected to a water source with a water pressure higher than the atmospheric pressure to ensure water pressure. For example, it is preferable to connect to a water supply. Here, the hydrogen water production device 10 obtains water supply pressure T from the pressure of water supplied from the water supply pipe 1. Therefore, the water supply pipe 1 is provided with a pressure control valve 21 so that the water supply pressure T can be adjusted to a value lower than the pressure of the water source supplied to the water supply pipe 1. This allows water to be stably supplied to the hydrogen water production device 10 at the water supply pressure T without depending on the pressure of tap water or the like supplied to the water supply pipe 1. The water supply pipe 1 further includes a check valve 22 for preventing backflow, and is connected to the inlet pipe 2 via the check valve 22. The inlet pipe 2 includes a branch pipe 2a to partially branch the water flow, and also includes a hydrogen supply pipe 2b from the hydrogen supply mechanism 30 described later to merge hydrogen, which will be described later.

The inlet pipe 2 is connected to the top of the first dissolution tank 11 as the upper pipeline. The first dissolution tank 11 is a hollow, vertical, sealed container, and water can be dropped from the inlet pipe 2, which is the upper pipeline, and supplied to the inside together with hydrogen. Inside the first dissolution tank 11, hydrogen and water coexist in two phases, and pressure is applied by the supplied water, which can promote the dissolution of hydrogen into the water. In addition, by dropping water from the top, gas phase bubbles are formed in the aqueous phase, which can also promote the dissolution of hydrogen.

The lower pipe of the first dissolved tank 11 is the upstream connecting pipe 3, which is connected to the upper part of the second dissolved tank 12 as the upper pipe of the second dissolved tank 12. The second dissolved tank 12 is also a hollow cylindrical vertical sealed container, and hydrogen and water (hydrogen water) are in a two-phase coexistence state inside. Furthermore, the downstream connecting pipe 4, which is the lower pipe of the second dissolved tank 12, is connected to the upper part of the third dissolved tank 13 as the upper pipe of the third dissolved tank 13. The third dissolved tank 13 is also a hollow cylindrical vertical sealed container, and hydrogen and water (hydrogen water) are in a two-phase coexistence state inside. In other words, the lower pipes are connected to the upper pipes in sequence from upstream to downstream, connecting the first dissolved tank 11, the second dissolved tank 12, and the third dissolved tank 13 in series. As a result, all dissolved tanks are in a two-phase coexistence state at the water supply pressure T of the inlet pipe 2, and hydrogen water can be produced while maintaining this state.

Each dissolution tank may be provided with a filter as appropriate. In the hydrogen water production device 10, the first dissolution tank 11 contains a carbon filter, and the second dissolution tank 12 contains a porous filter such as a nanofilter. The carbon filter can produce hydrogen water suitable for drinking, and the porous filter can break down the hydrogen bubbles that are produced so that they remain in the hydrogen water for a long time. In other words, the aim is to obtain hydrogen water that is suitable for drinking and has a stable hydrogen concentration. On the other hand, the third dissolution tank is a blank tank without a filter.

The extraction pipe 5 as the lower pipe of the third dissolved tank 13 is equipped with a pressure drop mechanism 23 that reduces the pressure of the hydrogen water to near atmospheric pressure. The pressure drop mechanism 23 is intended to suppress the release of hydrogen from the hydrogen water due to a sudden reduction in pressure. For example, the pressure drop mechanism 23 may be a tubular passage having a diameter and length that generates viscous resistance so as to impart the pressure loss of the pressure difference between the pressure in the first dissolved tank 11 and the atmospheric pressure to the flowing hydrogen water. A thin tube having a relatively long path can be preferably used for this purpose. This makes it possible to form a stable flow and prevent a sudden drop in pressure, and the pressure can be reduced without using a driving mechanism such as a valve for pressure adjustment. A flow rate measurement sensor 24 is provided further downstream of the extraction pipe 5 to measure the flow rate of the hydrogen water from the extraction pipe 5. The extraction pipe 5 is equipped with an electromagnetic valve 25 further downstream and is connected to the extraction port 6. The electromagnetic valve 25 may be a faucet.

As described above, the inlet pipe 2 is provided with a branch pipe 2a to partially branch the water flow. The branch pipe 2a is connected to the hydrogen supply mechanism 30 and can supply the branched water. In the hydrogen supply mechanism 30, the water from the branch pipe 2a is supplied to the electrolytic cell 33 via an RO filter 31 made of a reverse osmosis membrane and an ion filter 32 made of an ion exchange resin. In the electrolytic cell 33, hydrogen can be produced by electrolyzing the water. Oxygen produced at the same time as hydrogen is discharged from the top of the electrolytic cell 33. The produced hydrogen is supplied to the inlet pipe 2 through the hydrogen supply pipe 2b from the electrolytic cell 33 and merges with the water inside the inlet pipe 2. A pressure sensor 39 is connected to the hydrogen supply pipe 2b, and the pressure and amount of hydrogen supplied to the hydrogen supply pipe 2b can be adjusted by an electromagnetic valve 34.

Signals corresponding to the measured values are input from the pressure sensor 39 and the flow rate measurement sensor 24 of the extraction pipe 5 to the control board 40. The control board 40 responds to these input signals and controls the operation of the electrolytic cell 33, pressure control valve 21, and solenoid valve 34 according to a predetermined program.

Next, we will explain the method for producing hydrogen water using the hydrogen water production device 10.

When starting to use the hydrogen water production device 10, the solenoid valve 25 is opened to open the extraction pipe 5, and the first dissolution tank 11, the second dissolution tank 12, and the third dissolution tank 13 are all empty, that is, filled with air. For ease of explanation, it is assumed that there are no filters inside the dissolution tanks.

Referring again to FIG. 1, first, the pressure control valve 21 is opened and water is guided from the water supply pipe 1 to the inlet pipe 2. Furthermore, a portion of the water from the inlet pipe 2 is guided from the branch pipe 2a to the hydrogen supply mechanism 30 and supplied to the electrolytic cell 33 via the RO filter 31 and ion filter 32, where hydrogen is generated by electrolysis of water. The generated hydrogen flows from the hydrogen supply pipe 2b into the inlet pipe 2 and is mixed with the water, or is supplied directly to the top of the first dissolved tank 11.

2, in the first dissolved tank 11, liquid is stored in the lower part and gas is stored in the upper part in a gas-liquid two-phase coexistence state. By supplying gas (hydrogen) together with water, water is expelled to the connecting pipe 3 and flows into the second dissolved tank 12 so that the internal pressure of the first dissolved tank 11 is balanced with the internal pressure of the second dissolved tank 12. Furthermore, a part of the gas, especially air, which has a higher specific gravity than hydrogen, flows into the connecting pipe 3 together with the water and moves to the second dissolved tank 12. Similarly, in the second dissolved tank 12, gas (air) is supplied together with water from the first dissolved tank 11 through the connecting pipe 3, but the air moves together with water to the third dissolved tank 13 through the connecting pipe 4. In addition, in the third dissolved tank 13, gas (air) is supplied together with water from the second dissolved tank 12 through the connecting pipe 4, but the air is discharged to the outside together with water through the connecting pipe 5. In other words, the water levels S in the first dissolution tank 11, the second dissolution tank 12, and the third dissolution tank 13 are near the bottom and barely rise.

As time passes in this state, all of the air inside the first dissolution tank 11 moves to the second dissolution tank 12, and the inside of the first dissolution tank 11 is replaced with hydrogen. Similarly, the insides of the second dissolution tank 12 and the third dissolution tank 13 are successively replaced with hydrogen, with a slight time lag occurring.

As shown in FIG. 3, once the first dissolved tank 11, the second dissolved tank 12, and the third dissolved tank 13 are filled with hydrogen, the solenoid valve 25 is closed to block the outlet pipe 5, the supply of hydrogen is stopped, and only water is supplied to the first dissolved tank 11 from the inlet pipe 2. This causes the water level S to rise, compressing the volume of the gas phase in the first dissolved tank 11 and increasing the internal pressure. Meanwhile, since the internal pressure of the first dissolved tank 11 is attempting to become higher than that of the second dissolved tank 12, water is caused to flow out from the lower pipe, the connecting pipe 3, toward the second dissolved tank 12 in an attempt to balance the internal pressures of the first dissolved tank 11 and the second dissolved tank 12.

Furthermore, in the second dissolution tank 12, water flows in from the connecting pipe 3, raising the water level S, compressing the volume of the gas phase and increasing the internal pressure. Then, water flows out from the connecting pipe 4 toward the third dissolution tank 13, attempting to balance the internal pressures of the second dissolution tank 12 and the third dissolution tank 13.

Meanwhile, in the third dissolution tank 13, water flows in from the connecting pipe 4, causing the water level S to rise, compressing the volume of the gas phase and increasing the internal pressure, but because the extraction pipe 5 is blocked, the internal pressure tends to continue to rise. As a result, the internal pressure of the second dissolution tank 12 increases to balance with the internal pressure of the third dissolution tank 13, that is, the water level S rises, and similarly, the water level of the first dissolution tank 11 also rises. Here, if the inner diameters (cross-sectional areas) of the first dissolution tank 11, second dissolution tank 12, and third dissolution tank 13 are the same, the heights of the water levels S will also be approximately the same.

As shown in FIG. 4, water is supplied to the first dissolution tank 11, the second dissolution tank 12, and the third dissolution tank 13 until their internal pressures balance with the water supply pressure T, and the pressure control valve 21 is closed. In each of the dissolution tanks 11 to 13, a gas phase portion is formed by hydrogen pressurized by the water supply pressure T, and hydrogen water can be produced by dissolving hydrogen in the stored water.

In this way, even if the dissolution tank is filled with air at the start of use, the gas phase in the dissolution tank can be filled with hydrogen, making it possible to stably produce hydrogen water with a concentration corresponding to the water supply pressure T.

Next, the solenoid valve 25 is opened to extract hydrogen water, and the pressure control valve 21 is opened to supply water to the first dissolved tank 11. Here, as the water inside the third dissolved tank 13 decreases, the gas phase expands and the pressure tends to decrease. In response to this, water is supplied from the second dissolved tank 12 to balance the pressure. Similarly, when the pressure of the second dissolved tank 12 tends to decrease, water is supplied from the first dissolved tank 11. Here, the amount and pressure of water supplied by the pressure control valve 21 are controlled so that water is supplied from the inflow pipe 2 to compensate for the decrease in pressure in the first dissolved tank 11 and the pressure of the first dissolved tank 11 is maintained. At this time, the pressure control valve 21 is controlled so that the pressure of the third dissolved tank 13, which is upstream of the extraction pipe 5, is maintained at a predetermined value by the pressure drop mechanism 23 of the extraction pipe 5, and the overall pressure is balanced. For example, it is preferable to provide a flow rate equal to the flow rate of the extraction pipe 5 to the inflow pipe 2. This prevents pressure drops throughout the system and allows hydrogen water to be produced continuously at a stable concentration.

In particular, since multiple dissolution tanks are provided, even if water not containing dissolved hydrogen is supplied to the first dissolution tank 11, which is the most upstream dissolution tank, to temporarily dilute the hydrogen water in the first dissolution tank 11 and reduce the hydrogen concentration, the degree of dilution is reduced because hydrogen water from the first dissolution tank 11 is supplied to the downstream dissolution tanks 12 and 13. As a result, hydrogen water close to the concentration corresponding to the water supply pressure T can be stored at all times in the downstream dissolution tank, particularly in the dissolution tank 13, and hydrogen water with a stable hydrogen concentration can be continuously produced. In other words, by separating the dissolution tank to which water is supplied from the outside and the dissolution tank from which hydrogen water is taken out to the outside, hydrogen water with a stable hydrogen concentration can be obtained with good productivity.

Since the hydrogen water production device 10 has three dissolution tanks, hydrogen water with a particularly stable hydrogen concentration can be continuously stored in the third dissolution tank 13, which is the most downstream dissolution tank, and hydrogen water with such a hydrogen concentration can be constantly extracted from the extraction pipe 5. In particular, the first dissolution tank 11 is a hydrogen dissolution tank whose main function is to dissolve hydrogen, and the third dissolution tank 13 is a hydrogen concentration retention dissolution tank for retaining the hydrogen concentration of the hydrogen water to be extracted. In addition, the second dissolution tank 12 not only contributes to maintaining the hydrogen concentration, but also functions as a pressure adjustment dissolution tank that absorbs pressure fluctuations in the first dissolution tank 11 and suppresses pressure fluctuations in the third dissolution tank 13.

In the above example, the height of each of the first dissolution tank 11, the second dissolution tank 12, and the third dissolution tank 13 was set to 11 inches (approximately 280 mm), the water supply pressure T was set to 3 Bar (0.3 MPa), and a thin tube with an inner diameter of 5/32 inches (approximately 4 mm) and a length of 80 mm or more was used as the pressure reduction mechanism 23. It was confirmed that hydrogen water with a hydrogen concentration of 2.5 ppm or more could be stably and continuously produced.

The flow rate measurement sensor 24 and solenoid valve 25 of the outlet pipe 5 can function as a flow rate valve, but it is also preferable to provide an additional flow rate valve downstream of the inlet pipe 2 so that the flow rates of the water flowing through the inlet pipe 2 and the outlet pipe 5 can be controlled to be equal. This makes it possible to continuously produce hydrogen water with a stable hydrogen concentration with even greater productivity.

Although the method of simultaneously supplying water and hydrogen at the start of use has been described, hydrogen may be purged from the first dissolved tank 11 to the third dissolved tank 13 first. In this case, a valve that cuts off the water supply is added to the inlet pipe 2 between the branch pipe 2a and the hydrogen supply pipe 2b. This valve is then closed to supply water only to the hydrogen supply mechanism 30, generate hydrogen, and supply only hydrogen from the inlet pipe 2 to the first dissolved tank 11. This allows hydrogen water to be produced even if hydrogen is purged from all dissolved tanks, the hydrogen supply is then stopped, and only water is supplied. In particular, since hydrogen can be supplied from the top of each dissolved tank 11 to 13, air with a high specific gravity can be discharged first from the bottom, and hydrogen purging can be completed quickly, which contributes to improved productivity.

Although the above describes an embodiment of the present invention and variations based thereon, the present invention is not necessarily limited thereto, and a person skilled in the art will be able to find various alternative embodiments and modifications without departing from the spirit of the present invention or the scope of the appended claims.

Reference Signs List 1 Water pipe 2 Inlet pipe 2b Hydrogen supply pipe 5 Extraction pipe 10 Hydrogen water production device 11 First dissolution tank 12 Second dissolution tank 13 Third dissolution tank 23 Pressure drop mechanism 30 Hydrogen supply mechanism

Claims (9)

An apparatus for producing hydrogen water, comprising: an upper pipe line and a lower pipe line provided at the upper and lower parts of a dissolution tank made of a hollow cylindrical sealed container; water is supplied into the dissolution tank from the upper pipe line, and the water and hydrogen are brought into a two-phase coexistence state at a pressure higher than atmospheric pressure; and the water is taken out as hydrogen water from the lower pipe line,
The dissolution tank includes a plurality of dissolution tanks connected in series by sequentially connecting the lower pipeline to the upper pipeline from upstream to downstream, and a water supply pipe is connected to an inlet pipe, which is the upper pipeline of the most upstream dissolution tank;
A hydrogen water production apparatus characterized in that a water supply pressure T lower than the water supply pressure from the water supply pipe is adjusted by a water supply pressure regulating valve provided in the inlet pipe, and water is taken out to the outside by applying a pressure loss inside the extraction pipe, which is the lower pipe of the most downstream dissolution tank, while maintaining a two -phase coexistence state in all of the dissolution tanks. The hydrogen water production device according to claim 1, characterized in that the inlet pipe is connected to a hydrogen supply pipe from a hydrogen supply mechanism, and hydrogen and/or water is supplied to the dissolution tank located at the most upstream. The hydrogen water production device according to claim 1 or 2, characterized in that the inlet pipe and the outlet pipe are each provided with a flow valve, and the flow rate of water flowing through the inlet pipe and the outlet pipe per unit time is controlled to be equal. The hydrogen water production device according to any one of claims 1 to 3, characterized in that the extraction pipe is a tubular passage having a diameter and length that generates viscous resistance so as to provide a pressure loss equal to the pressure difference between the pressure in the dissolution tank at the most upstream and atmospheric pressure. The hydrogen water production device according to any one of claims 1 to 4, characterized in that the dissolution tanks are composed of three tanks: a hydrogen dissolution tank at the most upstream side, a hydrogen concentration holding tank at the most downstream side, and a pressure adjustment tank between them for adjusting the pressure. 6. The hydrogen water generating apparatus according to claim 5 , wherein the pressure adjusting dissolution tank contains a porous filter. 7. The hydrogen water generating apparatus according to claim 5 , wherein the hydrogen dissolving tank contains a carbon filter. A method for producing hydrogen water, comprising the steps of: providing an upper pipe line and a lower pipe line at the upper and lower parts of a dissolution tank made of a hollow cylindrical sealed container; supplying water from the upper pipe line into the dissolution tank; making the water coexist with hydrogen at a pressure higher than atmospheric pressure; and extracting the water as hydrogen water from the lower pipe line,
With respect to a plurality of dissolution tanks connected in series by sequentially connecting the lower pipelines to the upper pipelines from upstream to downstream, water is supplied from an inlet pipe, which is the upper pipeline, of the most upstream dissolution tank, and while maintaining a two-phase coexistence state in all of the dissolution tanks at a water supply pressure T of the inlet pipe, a pressure loss is applied inside an outlet pipe, which is the lower pipeline, of the most downstream dissolution tank to take out water to the outside,
A method for producing hydrogen water, characterized in that the outlet pipe is opened and all of the dissolution tanks are empty, hydrogen is supplied from the inlet pipe to fill the dissolution tanks with hydrogen, the supply of hydrogen is stopped and the outlet pipe is closed, the dissolution tanks are pressurized with water supplied from the inlet pipe, and all of the dissolution tanks are brought into a two-phase coexistence state at the water supply pressure T of the inlet pipe . 9. The method for producing hydrogen water according to claim 8 , wherein the flow rates of water flowing through the inlet pipe and the outlet pipe per unit time are set equal to each other.

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