Hydraulic power generator and electrolyzed water producing device

Abstract

To provide a hydraulic power generator with good generation efficiency, and an electrolyzed water producing device equipped with the hydraulic power generator.SOLUTION: In a hydraulic power generator (2), a base plate (25) partitions the inside of a case (3) into a first storage portion (31) storing a first impeller (23) and a second storage portion (32) storing a second impeller (24). On an inner peripheral wall of the first storage portion (31), a first inflow port (41), a first discharge port (42), and a second discharge port (43) are provided. On an inner peripheral wall of the second storage portion (32), a second inflow port (44) and a third discharge port (43) are provided. In the case (3), a standing circumferential wall (311) is provided, which covers an outer periphery of the second impeller (24), and opposes an outer edge of the base plate (25) with a first gap (S1). A part of a liquid in the second storage portion (32) flows to the first storage portion (31) through the first gap (S1), and a second gap (S2) between the base plate (25) and an inner wall of the case (3) in a diametrical direction of the first impeller (23) and the second impeller (24).SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a hydroelectric generator and an electrolytic water generating device. [Background technology]

[0002] There are known hydroelectric generators that operate with a low flow rate of water, such as from a tap (for example, Patent Document 1). In the hydroelectric generator of Patent Document 1, water that flows into the case from an inlet hits the blades of the impeller, causing the impeller to rotate, and is then discharged from an outlet that faces the inlet and the impeller. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-172988 A Summary of the Invention [Problem to be solved by the invention]

[0004] The hydroelectric generator of Patent Document 1 has a general configuration, and there is room for improvement in power generation efficiency.

[0005] An object of the present invention is to provide a hydroelectric generator having good power generation efficiency, and an electrolytic water generating device including the hydroelectric generator. [Means for solving the problem]

[0006] The invention is, for example, as follows: In the following, the reference numbers of the figures are used for reference. [1] A first impeller (23) and a second impeller (24) are stacked and have a common shaft (22) that transmits rotation to a power generation section (21); a case (3) that houses the first impeller (23) and the second impeller (24), a first blade (232) of the first impeller (23) is provided upright on a first surface of a base plate (25), and a second blade (242) of the second impeller (24) is provided upright on a second surface of the base plate (25), The base plate (25) divides the inside of the case (3) into a first housing section (31) that houses the first impeller (23) and a second housing section (32) that houses the second impeller (24), An inner circumferential wall of the first storage portion (31) is provided with a first inlet (41) for allowing liquid to flow into the first storage portion (31) and for rotating the first impeller (23) by the liquid, a first outlet (42), and a second outlet (43) located on the tip side of the first outlet (42) and on the base side of the first inlet (41) in the rotation direction of the first impeller (23) and the second impeller (24), an inner circumferential wall of the second storage portion (32) is provided with a second inlet (44) for allowing liquid to flow into the second storage portion (32) and for rotating the second impeller (24) by the liquid, and a third outlet (43); The outer end of the second blade (242) is located inside the outer edge of the base plate (25), The case (3) is provided with a vertical peripheral wall (311) that covers an outer periphery of the second impeller (24) and faces an outer edge of the base plate (25) with a first gap (S1) therebetween, A portion of the liquid in the second accommodating portion (32) flows into the first accommodating portion (31) through the first gap (S1) and a second gap (S2) between the base plate (25) and the inner wall of the case (3) in the radial direction of the first impeller (23) and the second impeller (24). [2] The hydroelectric generator (2) according to [1], The second outlet (43) also serves as the third outlet (43). [3] The hydroelectric generator (2) according to [2], the first inlet (41) and the first outlet (42) face each other in a first direction (X direction) perpendicular to the axial direction of the common shaft (22); The second inlet (44) and the second outlet (43) of the hydroelectric generator (2) face each other in the first direction (X direction). [4] The hydroelectric generator (2) according to [1], The first storage portion (31) is formed in a concave shape in the case (3), the second housing portion (32) has a larger diameter than the first housing portion (31), is connected to one end side of the first housing portion (31) in the axial direction of the common shaft (22), and has an opening at one end side in the axial direction closed by a cover body (310); The upright peripheral wall (311) is a hydroelectric generator (2) that is provided upright on the cover (310). [5] The hydroelectric generator (2) according to [4], The vertical peripheral wall (311) has a connecting opening (45) that is connected to the second inlet (44) and allows liquid to flow into the vertical peripheral wall (311). [6] The hydroelectric generator (2) according to [1], the first inlet (41) is smaller than the first outlet (42) and the second outlet (43); The second inlet (44) of the hydroelectric generator (2) is smaller than the third outlet (43). [7] The hydroelectric generator (2) according to [1], The hydroelectric generator (2), wherein the first blade (232) and the second blade (242) are located at different positions in the circumferential direction of the common shaft (22). [8] A hydroelectric generator (2) according to any one of [1] to [7]; a battery (14) that is charged by the electricity generated by the hydroelectric generator (2); an electrolytic cell (11) that performs electrolysis using the output of the battery (14) to generate electrolyzed water, an electrolytic water generator (1, 1A, 1B) for diluting the electrolytic water generated in the electrolytic cell (11) with the liquid discharged from the first outlet (42); [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a block diagram of an electrolytic water generating device. [Diagram 2] FIG. 2 is a schematic cross-sectional side view showing a main part of the hydroelectric generator. [Diagram 3] FIG. 2 is a schematic plan view of the case body with the lid removed. [Figure 4] FIG. 4 is a schematic cross-sectional view of the case for illustrating the flow of water in the first storage section. [Diagram 5] FIG. 11 is a schematic cross-sectional view of the case for illustrating the flow of water in the second storage section. [Figure 6] FIG. 4 is a schematic cross-sectional side view of the hydroelectric generator for illustrating the flow of water in the second housing portion. [Figure 7] FIG. 11 is a block diagram of another electrolyzed water generating device showing the treatment of water discharged from the second outlet. [Figure 8] FIG. 11 is a block diagram of another electrolyzed water generating device showing a third outlet provided separately from the second outlet. [Figure 9] FIG. 2 is a plan view showing the blades of an upper impeller and a lower impeller, the blades being positioned circumferentially offset from one another. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] 1 is a block diagram of an electrolyzed water generating device 1. In this specification, "electrolysis" may be abbreviated to "electrolysis."

[0009] The electrolytic water generating device 1 can perform electrolysis in the electrolytic cell 11 using electricity generated by hydroelectric power using water supply or the like, and can be installed in places without external electricity. The electrolytic water generating device 1 can be connected to a water faucet in, for example, a toilet, a bathroom, etc., and generates electrolytic water that can be used for cleaning, etc.

[0010] In the electrolyzed water generating device 1, the water supply unit 12 sends water to the hydroelectric generator 2 via a pipe 91. The water may be tap water, RO (Reverse Osmosis) water, or the like. The water is sent to the hydroelectric generator 2 under pressure from the water supply, gravity, or a pump. The water supply unit 12 only needs to send a liquid, and may send an appropriate aqueous solution. The pipe 91 is provided with an opening / closing mechanism 13 that opens and closes the inside of the pipe 91. The opening / closing mechanism 13 may be driven manually or under the control of a control unit 15 described below.

[0011] The hydroelectric generator 2 includes a power generating section 21, an upper impeller 23 (first impeller), and a lower impeller 24 (second impeller).

[0012] The upper impeller 23 and the lower impeller 24 are stacked and have a common shaft 22 that transmits rotation to the power generation unit 21. A rotational force is imparted to the upper impeller 23 and the lower impeller 24 by the liquid supplied from the water supply unit 12. This causes the common shaft 22 to rotate, and the rotational force is transmitted to the power generation unit 21 via the common shaft 22. The water supplied to the upper impeller 23 is discharged to the pipe 92 through the first outlet 42 described below. The water supplied to the upper impeller 23 is also discharged from the second outlet 43 described below. In this embodiment, the water supplied to the lower impeller 24 is also discharged from this second outlet 43. The water discharged to the second outlet 43 flows into the pipe 94.

[0013] The power generating unit 21 generates electricity by electromagnetic induction by relatively rotating the magnet and the coil using the rotational force transmitted via the common shaft 22. The power generated by the power generating unit 21 is supplied to the battery 14, which charges the battery 14. The battery 14 supplies power to the entire hydroelectric generator 2.

[0014] The control unit 15 includes a processor (not shown) that controls the entire electrolytic water generating device 1, a memory (not shown) that stores programs and the like to be loaded into the processor, a display (not shown) that displays a setting screen and the like, and an input unit (not shown) such as buttons that accept input of settings and the like from the user. The control unit 15 is driven by power supplied from the battery 14.

[0015] For example, when the control unit 15 receives an instruction from a user to drive the electrolytic cell 11 or detects the drive of the hydroelectric generator 2, the control unit 15 performs electrolysis in the electrolytic cell 11. At this time, the control unit 15 drives the pump 16 to send the electrolytic auxiliary liquid from the electrolytic auxiliary liquid tank 17 to the electrolytic cell 11. As the electrolytic auxiliary liquid, an electrolyte aqueous solution containing an appropriate electrolyte such as sodium hydroxide, potassium hydroxide, salt, hydrochloric acid, or sodium bicarbonate can be used. In this embodiment, the electrolyte auxiliary liquid is an electrolyte aqueous solution containing hydrochloric acid.

[0016] The electrolytic cell 11 is a single-chamber electrolytic cell that performs electrolysis using an anode and a cathode that are not separated by a diaphragm, and can be driven at a low voltage. The electrolytic cell 11 electrolyzes the electrolytic auxiliary solution based on the power supplied from the battery 14, and generates acidic electrolytic water or alkaline electrolytic water. In this embodiment, the electrolytic cell 11 electrolyzes an electrolyte aqueous solution containing hydrochloric acid, and generates acidic electrolytic water, which is hypochlorous acid water.

[0017] The electrolytic water generated by the electrolytic cell 11 is discharged to the pipe 93. The pipe 92 joins the pipe 93, and the pipe 94 joins the pipe 92 downstream of the joining point, and is connected to the electrolytic water outlet 18. As a result, the electrolytic water generated by the electrolytic cell 11 is diluted with water from the first outlet 42 that rotates the upper impeller 23, and then further diluted with water from the second outlet 43 that rotates the upper impeller 23 and the lower impeller 24, and discharged to the electrolytic water outlet 18. In this way, in this embodiment, the electrolytic water is diluted with water from the outlet 42, and then further diluted with water from the second outlet 43, so that the electrolytic water and water can be well mixed and the electrolytic water can be diluted evenly. The same applies to the configuration of the electrolyzed water generator 1 when generating alkaline electrolyzed water.

[0018] In this embodiment, the acidic electrolyzed water generated in the electrolytic cell 11 is diluted to finally become slightly acidic electrolyzed water with a pH of 5 to 6.5. When the electrolyzed water generator 1 is connected to a water faucet, the generated acidic electrolyzed water is discharged to the outside from the electrolyzed water outlet 18. Therefore, the electrolyzed water generator 1 can generate electrolyzed water without being connected to an external power source, and the electrolyzed water can be used for cleaning, etc. In this embodiment, only one electrolyzed water outlet 18 is provided as an outlet for the water that has rotated the upper impeller 23 and the lower impeller 24, so the configuration of the electrolyzed water generator 1 can be simplified.

[0019] As in the electrolyzed water generator 1A shown in Fig. 7, the water from the second outlet 43 obtained by rotating the upper impeller 23 and the lower impeller 24 may not be used to dilute the electrolyzed water, and may be discharged to the water outlet 19 via the pipe 94. The electrolyzed water generated in the electrolytic cell 11 may be diluted only with the water from the first outlet 42 obtained by rotating the upper impeller 23. In the electrolyzed water generator 1A, the amount of water supplied to the hydroelectric generator 2 is distributed to the upper impeller 23 and the lower impeller 24 so that the amount of diluted water of the electrolyzed water is discharged from the first outlet 42.

[0020] As in the electrolytic water generating device 1B shown in FIG. 8, a third outlet 46 for discharging the water that rotates the lower impeller 24 may be provided separately from the second outlet 43. The water that rotates the lower impeller 24 may be discharged to the water outlet 19 via a pipe 95 connected to the third outlet 46. A pipe 94 may join the pipe 92 downstream of the joining point of the pipe 93. That is, the electrolytic water may be diluted with water from the first outlet 43 that rotates the upper impeller 23, and then the electrolytic water may be diluted with water from the second outlet 43 that rotates the upper impeller 23.

[0021] In the electrolytic water generating devices 1, 1A, and 1B, the electrolytic water is diluted using at least the water from the first outlet 42 generated by rotating the upper impeller 23, but which of the outlets is used to dilute the electrolytic water and which is not can be designed appropriately.

[0022] Fig. 2 is a schematic side cross-sectional view showing a main part of the hydroelectric generator 2. Hereinafter, the axial direction of the common shaft 22 is defined as the Z direction, the side of the common shaft 22 to which the upper impeller 23 and the lower impeller 24 are attached is defined as the -Z direction, and the opposite side is defined as the +Z direction. In Fig. 2, in order to show the flow of water, the case 3 is cut at a cross section passing through the centers of the upper impeller 23 and the lower impeller 24 and a first inlet 41 and a first outlet 42 described later.

[0023] The upper impeller 23 and the lower impeller 24 share a disk-shaped base plate 25. A circular ring-shaped wall portion 231 and a plurality of blades 232 (first blades) extending from the ring-shaped wall portion 231 radially outwardly of the upper impeller 23 and the lower impeller 24 are formed on a first surface of the base plate 25 on the upper side (+Z direction side) of FIG. 2 (see also FIG. 4). The outer ends of the blades 232 are located inside the outer edge of the base plate 25. A disk-shaped closure plate 233 is provided to sandwich each blade 232 with the base plate 25.

[0024] The lower impeller 24 has a similar configuration to the upper impeller 23. A circular annular wall portion 241 and a plurality of blades 242 (second blades) extending radially outward from the annular wall portion 241 are formed on the second surface of the base plate 25 on the lower side (-Z direction side) in FIG. 2 (see also FIG. 5). The outer ends of the blades 242 are located inside the outer edge of the base plate 25. A disk-shaped closure plate 243 is provided to sandwich each blade 242 with the base plate 25. The blades 232, 242 are, for example, the same in number and are formed at equal intervals in the circumferential direction. The blades 232, 242 are, for example, positioned offset in the circumferential direction (see also FIG. 9).

[0025] The -Z direction end of the common shaft 22 is inserted into the case 3 and passes through the center of the closure plate 233 and the base plate 25. A fastening member is attached to the -Z direction end of the common shaft 22 at the front part of the case 3. A fastening member is attached to the -Z direction end of the common shaft 22 within the annular wall portion 241 of the lower impeller 24. The upper impeller 23 and the lower impeller 24 are fastened to the -Z direction end of the common shaft 22 by these fastening members. The power generation unit 21 is connected to the +Z direction side of the common shaft 22.

[0026] The case 3 of the hydroelectric generator 2 is made of, for example, resin. The case 3 includes a case body 300 that houses the upper impeller 23 and the lower impeller 24, and a lid body 310 that is connected to the case body 300. A vertical peripheral wall 311 that is annular in plan view is provided on the lid body 310. The vertical peripheral wall 311 extends from the lid body 310 in the +Z direction and is fitted into the inner peripheral wall of the second housing portion 32 to cover the outer periphery of the lower impeller 24. The lid body 310 may be assembled to the case body 300 by fitting the vertical peripheral wall 311 into the inner peripheral wall of the second housing portion 32, or may be assembled to the case body 300 by an appropriate method.

[0027] The outer edge of the base plate 25 protrudes radially outward at the upper impeller 23 and the lower impeller 24, dividing the inside of the case 3 into a first accommodating section 31 that accommodates the upper impeller 23 and a second accommodating section 32 that accommodates the lower impeller 24.

[0028] In this embodiment, the outer edge of the base plate 25 is located between a step surface 321 and the standing peripheral wall 311, which will be described later. The height of the standing peripheral wall 311 from the cover body 310 is set to a size that creates a gap S1 (see the enlarged view in FIG. 2: first gap) between the standing peripheral wall 311 and the outer edge of the base plate 25 that is large enough for water to flow smoothly. The gap S1 is, for example, 1 mm. It can be said that the standing peripheral wall 311 faces the outer edge of the base plate 25 with the gap S1 therebetween. The function of the gap S1 will be described later.

[0029] In order to enable the base plate 25 to rotate smoothly, as shown in the enlarged view of Figure 2, there is a gap S2 (second gap) between the outer edge of the base plate 25 in the radial direction of the upper impeller 23 and the lower impeller 24 and the inner wall of the case 3 (the inner wall of the second accommodating section 32), and there is a gap S3 between the outer edge of the base plate 25 and the step surface 321.

[0030] FIG. 3 is a schematic plan view of case body 300 with cover 310 removed.

[0031] The case body 300 is formed with a first housing section 31 that is concave and opens circularly in plan view to house the upper impeller 23, and a second housing section 32 that is connected to the -Z direction side (the front side of the paper in FIG. 3) of the first housing section 31. The second housing section 32 houses the lower impeller 24. The second housing section 32 has a larger diameter than the first housing section 31 in order to house the outer edge of the base plate 25, and a step surface 321 that is annular in plan view is formed at the bottom along the inner circumferential wall.

[0032] The -Z direction side of the second storage section 32 (the front side of the paper in FIG. 3) opens in a circular shape in a plan view, and this opening is closed by the lid body 310. The lid body 310 is positioned in the Z direction with respect to the bottom surface of the first storage section 31, for example, by an edge of the lid body 310 contacting the outside of the opening of the second storage section 32.

[0033] The inner wall of the first accommodating section 31 is provided with a first inlet 41 for allowing liquid to flow into the first accommodating section 31 and rotate the upper impeller 23 with the liquid, a first outlet 42, and a second outlet 43 which is located closer to the tip side than the first outlet 42 and closer to the base side than the first inlet 41 in the rotation direction R of the upper impeller 23 and the lower impeller 24.

[0034] From the first inlet 41, a passage 411 extends linearly in the -X direction perpendicular to the Z direction within the case body 300. The direction opposite to the -X direction is the +X direction. The direction perpendicular to the X and Z directions is the Y direction, with the first inlet 41 side in the Y direction being the +Y direction and the second outlet 43 side being the -Y direction. The passage 411 is connected to a passage 412 extending in the -Z direction (the front side of the paper in FIG. 3). The passages 411, 412 have a circular cross section. Water supplied from the water supply unit 12 is led to the first inlet 41 via one branch of the pipe 91 and the passages 412, 411.

[0035] From the first outlet 42, a passage 421 extends linearly in the +X direction in the case body 300. Due to the formation of the passage 421, the area on the -X side of the passage 421 does not have the step surface 321 and the thick portion in the +Z direction (the back side of the paper in FIG. 3) of the step surface 321. The passage 421 is connected to a passage 422 extending in the -Z direction (the front side of the paper in FIG. 3). The passages 421 and 422 have a circular cross section. Water discharged from the first outlet 42 is led to the pipe 92 (FIG. 1) through these passages 421 and 422. The diameter of the passage 411 is smaller than the diameter of the passage 421, and therefore the first inlet 41 is smaller than the first outlet 42. The first inlet 41 is located inside the width of the first outlet 42 in the Y direction and faces the first outlet 42 in the X direction.

[0036] From the second outlet 43, a passage 431 extends linearly in the -X direction in the case body 300. Due to the formation of the passage 431, the area on the +X side of the passage 431 does not have the stepped surface 321 and the thick portion in the +Z direction (the rear side of the paper in FIG. 3) of the stepped surface 321. The passage 431 is connected to a passage 432 extending in the -Z direction (the front side of the paper in FIG. 3). The passages 431 and 432 have a circular cross section. The water discharged from the second outlet 43 is led to the pipe 94 (FIG. 1) via the passages 431 and 432. The diameter 441 of the passage is smaller than the diameter of the passage 431, and therefore the second inlet 441 is smaller than the second outlet 43. The diameter of the passage 411 is smaller than the diameter of the passage 431, and therefore the first inlet 41 is smaller than the second outlet 43.

[0037] The inner peripheral wall of the second accommodating portion 32 is provided with a second inlet 44 for allowing liquid to flow into the second accommodating portion 32 and rotate the lower impeller 24 with the liquid, and a second outlet 43 (third outlet).

[0038] A passage 441 extends from the second inlet 44 in the +X direction within the case body 300. The passage 441 is connected to a passage 442 extending in the -Z direction (the front side of the paper in FIG. 3). The passages 441 and 442 have a circular cross section. Water supplied from the water supply unit 12 is guided to the second inlet 44 via the other branch of the pipe 91 and the passages 442 and 441.

[0039] The second exhaust port 43 is formed across the inner circumferential wall of the first accommodation portion 31 and the inner circumferential wall of the second accommodation portion 32. The second inlet 44 is located inside the width of the second exhaust port 43 in the Y direction and faces the second exhaust port 43 in the X direction.

[0040] In this embodiment, the first inlet 41 and the first outlet 42 face each other in the X direction, and the second inlet 44 and the third outlet 43 face each other in the X direction, so that each of the passages 411, 421, 441, 431 can be accommodated within a certain width in the Y direction. In addition, the second outlet 43 in the inner peripheral wall of the first housing portion 31 also serves as the outlet in the inner peripheral wall of the second housing portion 32. As a result, the width of the case 3 in the Y direction can be narrowed, and the case 3 can be made compact. The outlet in the inner peripheral wall of the second housing portion 32 may be provided separately from the second outlet 43 in the inner peripheral wall of the first housing portion 31. For example, the outlet in the inner peripheral wall of the second housing portion 32 may be provided at a position different from the second outlet 43 in the inner peripheral wall of the first housing portion 31 in the rotation direction R.

[0041] In the hydroelectric generator 2, the impeller is arranged in two stages, an upper impeller 23 and a lower impeller 24, so that power generation can be ensured even with a low water flow rate, and water flow is supplied to each of them from the water supply unit 12 via piping 91 that branches in two directions. Water flow is supplied to the upper impeller 23 from a first inlet 41 on the inner circumferential wall of the first housing unit 31, and water flow is supplied to the lower impeller 24 from a second inlet 44 on the inner circumferential wall of the second housing unit 32.

[0042] FIG. 4 is a schematic cross-sectional view of case 3 for illustrating the flow of water inside first storage section 31 (cross-sectional view taken along line IV shown in FIG. 2).

[0043] The water discharged from the first inlet 41 into the first housing section 31 hits each blade 232 of the upper impeller 23, causing the upper impeller 23 to rotate in the rotation direction R. A portion of the water that has flowed into the space V1 between the adjacent blades 232 and the annular wall section 231 is discharged to the first outlet 42 when the space V1 is exposed to the first outlet 42 as the upper impeller 23 rotates. A portion of the water in the space V1 that has not been discharged through the first outlet 42 is discharged to the second outlet 43 when the space V1 is exposed to the second outlet 43 as the upper impeller 23 rotates. The remaining water in the upper impeller 23 that has not been discharged to the second outlet 43 is carried in the rotation direction R by the upper impeller 23.

[0044] In the first housing section 31 housing the upper impeller 23, if water is supplied to the upper impeller 23 in an amount greater than the amount of water that the upper impeller 23 can hold, the upper impeller 23 cannot rotate smoothly. In this embodiment, since two outlets (the first outlet 42 and the second outlet 43) are provided, the amount of water held by the upper impeller 23 can be reduced compared to when there is only one outlet. As a result, in this embodiment, the upper limit rotation speed of the upper impeller 23 and the lower impeller 24 can be increased, and power generation efficiency can be improved. In addition, in this embodiment, since the first inlet 41 is smaller than the first outlet 42 and the second outlet 43, the momentum of the water flow supplied from the first inlet 41 can be increased, and the rotation efficiency of the upper impeller 23 and the lower impeller 24 can be improved.

[0045] Fig. 5 is a schematic cross-sectional view of the case 3 (cross-sectional view of VI shown in Fig. 6) for explaining the flow of water in the second storage section 32. Fig. 6 is a schematic cross-sectional side view of the hydroelectric generator 2 for explaining the flow of water in the second storage section 32. In Fig. 6, in order to show the flow of water, the case 3 is cut at a cross section passing through the centers of the upper impeller 23 and the lower impeller 24, the second inlet 44, and the second outlet 43.

[0046] A vertical peripheral wall 311 is fitted to the inner peripheral wall of the second storage section 32. The second inlet 44 is located radially outside the vertical peripheral wall 311, and the vertical peripheral wall 311 has a connecting opening 45 (see also FIG. 6 ) that is connected to the second inlet 44 and allows water to flow into the vertical peripheral wall 311. The connecting opening 45 is a hole in this embodiment, but may be a notch that opens at the edge of the vertical peripheral wall 311 in the +Z direction.

[0047] Water discharged from the second inlet 44 into the second housing section 32, specifically, water discharged from the second inlet 44 through the connecting opening 45 into the vertical peripheral wall 311, hits each blade 242 of the lower impeller 24, causing the lower impeller 24 to rotate in the rotation direction R. In this embodiment, since the second inlet 44 is smaller than the second outlet 43, the momentum of the water flow supplied from the second inlet 44 can be increased.

[0048] A portion of the water that has flowed into the space V2 between the adjacent blades 242 and the annular wall portion 241 is discharged to the second discharge port 43 when the space V2 is exposed to the second discharge port 43 through the gap S1 (see also FIG. 6 ) between the vertical peripheral wall 311 and the base plate 25 as the lower impeller 24 rotates. The remaining water in the lower impeller 24 that has not been discharged to the second discharge port 43 is carried in the rotation direction R by the lower impeller 24.

[0049] Here, the second storage section 32 has one less discharge port than the first storage section 31. Therefore, when the amount of water supplied into the second storage section 32 is large and exceeds the amount of water discharged from the second discharge port 43 (when the amount of water supplied to the lower impeller 24 exceeds the amount of water that the lower impeller 24 can hold), the lower impeller 24 cannot rotate smoothly, and the target rotation speeds of the upper impeller 23 and the lower impeller 24 cannot be obtained.

[0050] Therefore, in this embodiment, a gap S1 having a sufficient size (for example, 1 mm) for smooth flow of water is provided between the vertical peripheral wall 311 and the base plate 25. The gap S1 is provided in the circumferential direction. In this embodiment, a part of the water in the second housing part 32 can be flowed to the first housing part 31 through the first gaps S1 to S3. In other words, the lower impeller 24 can rotate while sending a part of the water supplied to the lower impeller 24 radially outward in the circumferential direction by the lower impeller 24 and releasing it to the upper impeller 23 through the gaps S1 to S3 (see the enlarged view of FIG. 2 and FIG. 6). As a result, in this embodiment, a smooth inflow of water into the lower impeller 24 can be ensured. As described above, in this embodiment, the resistance of water to the upper impeller 23 and the lower impeller 24 can be suppressed, so that the rotation efficiency of the upper impeller 23 and the lower impeller 24 can be improved, and the power generation efficiency can be improved.

[0051] 9, the blades 232 of the upper impeller 23 and the blades 242 of the lower impeller 24 are at different positions in the circumferential direction of the common shaft 22. The number of blades 232, 242 may be the same. In this embodiment, such an arrangement of the blades 232, 242 makes it possible to reduce the rotation loss of the lower impeller 24 when a portion of the water supplied to the lower impeller 24 is sent radially outward in the circumferential direction by the lower impeller 24 and released to the upper impeller 23 through the above-mentioned gaps S1 to S3.

[0052] The present invention can be implemented in the embodiments without departing from its features. The embodiments, modifications, and effects are merely illustrative and should not be construed as limiting the present invention. The features and structures of the embodiments and modifications can be added and combined in various ways to obtain alternative configurations. [Explanation of symbols]

[0053] 1, 1A, 1B...electrolytic water generating device, 2...hydroelectric generator, 3...case, 11...electrolytic cell, 14...battery, 21...power generating section, 22...common shaft, 23...first impeller, 24...second impeller, 25...base plate, 31...first storage section, 32...second storage section, 41...first inlet, 42...first outlet, 43...second outlet, third outlet, 44...second inlet, 232...first blade, 242...second blade, 311...vertical peripheral wall, S1...first gap, S2...second gap.

Claims

1. a first impeller and a second impeller that are stacked and have a common shaft that transmits rotation to a power generation section; a case that houses the first impeller and the second impeller, A first blade of the first impeller is provided upright on a first surface of a base plate, and a second blade of the second impeller is provided upright on a second surface of the base plate, The base plate divides the inside of the case into a first housing section that houses the first impeller and a second housing section that houses the second impeller, an inner circumferential wall of the first housing portion has a first inlet for allowing liquid to flow into the first housing portion and for rotating the first impeller with the liquid, a first outlet, and a second outlet located on the tip side of the first outlet and on the base side of the first inlet in a rotation direction of the first impeller and the second impeller; an inner circumferential wall of the second housing portion has a second inlet for allowing liquid to flow into the second housing portion and for rotating the second impeller by the liquid, and a third outlet; an outer end of the second blade is located inside an outer edge of the base plate, The case is provided with a vertical peripheral wall that covers an outer periphery of the second impeller and faces an outer edge of the base plate with a first gap therebetween, A hydroelectric generator in which a portion of the liquid in the second accommodating portion flows into the first accommodating portion through the first gap and a second gap between the base plate and the inner wall of the case in the radial direction of the first impeller and the second impeller.

2. 2. The hydroelectric generator according to claim 1, The second outlet also serves as the third outlet.

3. 3. The hydroelectric generator according to claim 2, The first inlet and the first outlet face each other in a first direction perpendicular to an axial direction of the common shaft, The second inlet and the second outlet are opposed to each other in the first direction.

4. 2. The hydroelectric generator according to claim 1, The first housing portion is formed in a concave shape in the case, the second housing portion has a larger diameter than the first housing portion, is connected to one end side of the first housing portion in the axial direction of the common shaft, and has an opening at the one end side in the axial direction closed by a lid body; The upright peripheral wall is a hydroelectric generator that is erected on the lid body.

5. 5. The hydroelectric generator according to claim 4, A hydroelectric generator in which the vertical peripheral wall has a connecting opening that is connected to the second inlet and allows liquid to flow into the vertical peripheral wall.

6. 2. The hydroelectric generator according to claim 1, the first inlet is smaller than the first outlet and the second outlet; The second inlet is smaller than the third outlet.

7. 2. The hydroelectric generator according to claim 1, A hydroelectric generator, wherein the first blade and the second blade are located at different positions in a circumferential direction of the common shaft.

8. A hydroelectric generator according to any one of claims 1 to 7; a battery that is charged by the power generated by the hydroelectric generator; an electrolytic cell that performs electrolysis using the output of the battery to generate electrolyzed water; An electrolytic water generating device that dilutes the electrolytic water generated by the electrolytic cell with the liquid discharged from the first outlet.

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