Electrolytic water producing apparatus

Abstract

To provide an electrolytic water producing apparatus capable of maintaining proper power generation efficiency by a water wheel even when water flow is increased.SOLUTION: An electrolytic water producing apparatus (1) is assembled with: an electrolysis cell (12) for producing an electrolysis product solution by electrolysis of an electrolyte aqueous solution; a dilution channel (8) for diluting the electrolysis product solution sent from the electrolysis cell (12) with dilution water so as to produce electrolytic water; a water wheel (2) which is provided upstream of an inflow point (81) of the electrolysis product solution in the dilution channel (8) and wherein an impeller (22) for electricity generation in a housing (21) is rotated by dilution water supplied from the dilution channel (8); a first flow-out channel (3) for discharge of dilution water applied to the impeller (22) from a housing space (V) of the impeller (22) in the housing (21) to the dilution channel (8); and a second flow-out channel (4) for discharge of excess dilution water in the housing space (V) to the dilution channel (8).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electrolyzed water generating device having a water wheel for generating electricity. [Background technology]

[0002] A water turbine for generating electricity is known (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-172988 Summary of the Invention [Problem to be solved by the invention]

[0004] In such a water turbine, the housing is generally provided with one inlet and one outlet for the fluid, but if a water flow exceeding the maximum capacity of the impeller is supplied, it will interfere with the rotation of the impeller. [Means for solving the problem]

[0005] The present invention is, for example, as follows: In the following, the reference numerals of the figures are used for reference. [1] an electrolytic cell (12) for electrolyzing an aqueous electrolyte solution to produce an electrolytic solution; a dilution flow path (8) for diluting the electrolytic solution sent from the electrolytic cell (12) with dilution water to produce electrolyzed water; a water turbine (2) provided upstream of an inflow point (81) of the electrolytic solution in the dilution flow path (8), the water turbine (2) rotating an impeller (22) for power generation in a housing (21) by dilution water supplied from the dilution flow path (8); a first outlet flow path (3) for discharging the dilution water that has acted on the impeller (22) from the accommodation space (V) of the impeller (22) in the housing (21) to the dilution flow path (8); a second outlet flow path (4) for discharging excess dilution water in the storage space (V) to the dilution flow path (8); An electrolytic water generating device (1, 1A) comprising: [2] In the electrolyzed water generating device (1, 1A) according to [1], The impeller (22) discharges dilution water supplied from the radially outer side to the radially outer side, In the electrolyzed water generating device (1, 1A), an inner peripheral wall (23) of the housing (21) covering the radially outer side of the impeller (22) in the storage space (V) is provided with an inlet (83) through which diluted water supplied from the dilution flow path (8) flows into the storage space (V), an outlet (31) of the first outlet flow path (3) through which the diluted water in the storage space (V) flows out of the storage space (V), and a surplus outlet (43) of the second outlet flow path (4) through which surplus diluted water in the storage space (V) flows out of the storage space (V), in this order in the rotation direction (R) of the impeller (22). [3] In the electrolyzed water generating device (1, 1A) according to [1], The second outlet flow path (4) is an electrolyzed water generator (1, 1A) that allows dilution water to flow into the dilution flow path (8) downstream of the inlet point (81). [4] In the electrolyzed water generator (1, 1A) according to [3], an inner pipe (84) constituting the dilution flow path (8) and an outer pipe (85) covering the inner pipe (84) and having a downstream open end (841) of the inner pipe (84) located therein are provided downstream of the inflow point (81) in the dilution flow path (8); In the electrolyzed water generator (1, 1A), an inner peripheral surface of the outer pipe (85) covering the inner pipe (84) has a surplus inlet (851) of the second outlet flow path (4) for allowing dilution water to flow into the outer pipe (85). [5] In the electrolyzed water generating device (1, 1A) according to [4], The second outlet flow path (4) at the connection portion with the outer pipe (85) is disposed in an orientation in which its center line (C) intersects with the outer peripheral surface of the inner pipe (84), and the electrolyzed water generator (1, 1A) discharges diluted water toward the outer peripheral surface of the inner pipe (84) through the surplus inlet (851). [6] In the electrolyzed water generator (1, 1A) according to [4], The second outlet flow path (4) at the connection portion with the outer pipe (85) is disposed in such a position that its center line (C) avoids the outer peripheral surface of the inner pipe (84), and the electrolyzed water generator (1, 1A) discharges diluted water through the surplus inlet (851) toward between the inner pipe (84) and the outer pipe (85). [7] In the electrolyzed water generator (1, 1A) according to any one of [1] to [6], an electrolyte aqueous solution tank (11) connected to the electrolytic cell (12) via a connecting pipe (91); At the inflow point (81), a narrow tube (92) having a smaller diameter than the pipe (82) and connected to the electrolytic cell (12) is connected to a pipe (82) constituting the dilution flow path (8), and the electrolytic product solution is sucked from the electrolytic cell (12) through the narrow tube (92) into the dilution flow path (8) by the water flow of dilution water flowing through the dilution flow path (8); In the electrolyzed water generator (1, 1A), the aqueous electrolyte solution is sucked from the aqueous electrolyte solution tank (11) through the connecting pipe (91) into the electrolytic cell (12) by a suction pressure generated at the inlet (81) and transmitted to the electrolytic cell (12). [8] In the electrolyzed water generating device (1A) according to [7], The electrolyzed water generator (1A) has a constricted portion (82A) at the inlet point (81) of the dilution flow path (8), and the constricted portion (82A) has a smaller flow path cross-sectional area than the upstream and downstream sides of the inlet point (81) in the dilution flow path (8), reducing the pressure of the flowing dilution water. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a diagram showing the configuration of an electrolyzed water generating device. [Figure 2]FIG. 1 is a cross-sectional view of an aspirator showing aspects of the inlet point. [Figure 3] 10 is a diagram showing a mode in which part of the raw water supplied from the water supply section bypasses the impeller. FIG. [Figure 4] FIG. 10 is a view showing one embodiment of an overflow channel at a connection portion with an outer pipe. [Figure 5] 10A and 10B are views showing another aspect of the overflow channel at the connection portion with the outer pipe. [Figure 6] Figure 6A is a diagram showing the flow of raw water in the housing of the water turbine, and Figure 6B is a side view of the water turbine. [Figure 7] FIG. 10 is a diagram showing the configuration of an electrolyzed water generating device having a constricted portion at the inflow point. DETAILED DESCRIPTION OF THE INVENTION

[0007] FIG. 1 is a diagram showing the configuration of an electrolyzed water generating device 1. As shown in FIG. The electrolytic water generating device 1 includes an electrolyte aqueous solution tank 11, an electrolytic cell 12, a dilution flow path 8, a water supply section 13, an electrolytic water discharge section 14, a water turbine 2, a power generation circuit 15, an outflow flow path 3 (first outflow flow path), and an overflow flow path 4 (second outflow flow path).

[0008] The electrolyte aqueous solution tank 11 stores an appropriate electrolyte aqueous solution. When the electrolytic water generator 1 generates slightly acidic electrolyzed water with an effective chlorine concentration of 10 to 80 ppm and a pH of 5.0 to 6.5, hydrochloric acid or a solution obtained by adding a sodium chloride aqueous solution to hydrochloric acid can be used as the electrolyte aqueous solution. When the electrolytic water generator 1 generates electrolyzed hypochlorous water with an effective chlorine concentration of 10 to 80 ppm and a pH of 7.5 or higher, a sodium chloride aqueous solution can be used as the electrolyte aqueous solution. The electrolyte aqueous solution tank 11 is connected to the electrolytic cell 12 via a pipe 91 (connecting pipe). The electrolyte aqueous solution stored in the electrolyte aqueous solution tank 11 is sent to the electrolytic cell 12 via the pipe 91 (connecting pipe).

[0009] The electrolytic cell 12 is a single-chambered cell, and its interior is not divided by a diaphragm. The electrolytic cell 12 electrolyzes the electrolyte aqueous solution by applying a voltage of a certain value or higher corresponding to the electrolyte aqueous solution to a pair of electrodes contained therein, thereby producing an electrolytic product solution. In the electrolytic water generator 1, when hydrochloric acid or a solution of hydrochloric acid with a sodium chloride solution is used as the electrolyte aqueous solution and the electrolytic cell 12 is equipped with only a pair of electrodes, for example, when a voltage of 1.3 V or higher is applied to the electrodes, chlorine begins to be generated in the electrolytic cell 12. A satisfactory amount of chlorine is generated (a satisfactory electrolytic product solution is produced) at 1.5 V or higher, allowing the electrolytic water generator 1 to produce a satisfactory slightly acidic electrolytic water. Appropriate gases generated during electrolysis, such as hydrogen and chlorine, may be separated from the electrolytic product solution by a separation mechanism (not shown) provided in the electrolytic cell 12 and discharged to the outside, or may be discharged from the electrolytic cell 12 together with the electrolytic product solution. The electrolytic product solution in the electrolytic cell 12 is sent to the dilution flow path 8 via a thin tube 92.

[0010] Raw water (water for diluting the electrolytic solution, dilution water) such as tap water or RO (Reverse Osmosis) water is supplied to the dilution flow path 8 from a water supply unit 13. In this embodiment, the water supply unit 13 is connected to a water supply, and the raw water supplied from the water supply unit 13 to the dilution flow path 8 is subjected to water pressure from the water supply. At an inflow point 81 of the electrolytic solution in the dilution flow path 8, a thin tube 92 is connected to a pipe 82 that constitutes the dilution flow path 8. In this embodiment, this thin tube 92 extends with approximately the same inner diameter from the connection with the pipe 82 to the electrolytic cell 12. In FIG. 1, only the connection portion of the thin tube 92 to the dilution flow path 8 is shown enlarged.

[0011] The narrow tube 92 has a smaller diameter than the piping 82 of the dilution flow path 8 to which it is connected, for example, 20% of the diameter of the piping 82. The flow of raw water through the dilution flow path 8 sucks the electrolytic solution from the electrolytic cell 12 into the dilution flow path 8 via the narrow tube 92. Furthermore, the suction pressure generated at the inflow point 81 and transmitted to the electrolytic cell 12 sucks the electrolyte aqueous solution from the electrolyte aqueous solution tank 11 into the electrolytic cell 12 via the piping 91. Therefore, in this embodiment, a pump for sucking the electrolyte aqueous solution from the electrolyte aqueous solution tank 11 can be eliminated.

[0012] As shown in FIG. 2, the inlet 81 may be provided with a so-called aspirator 89, which generates suction pressure for the capillary tube 92 by the Venturi effect using raw water as a driving fluid. The aspirator 89 may be a T-shaped joint in which a branch pipe 921 constitutes the capillary tube 92 and a main pipe 821 constitutes the piping 82. In the main pipe 821 of the aspirator 89, raw water is sprayed from a tapered nozzle 822 provided upstream, where the flow rate is increased and the pressure is reduced, and the raw water proceeds into a diffuser 823. The diffuser 823 has a constricted portion and a diverging portion provided downstream thereof, which reduces the flow rate of the raw water and restores the pressure of the raw water in the diffuser 823. The flow of raw water generates suction pressure at a transition portion 811 (inlet 81) in the main pipe 821 from the nozzle 822 to the diffuser 823. A branch pipe 921 is connected to the transition section 811, and the suction pressure generated in the transition section 811 causes the electrolytic product solution in the branch pipe 921 (capillary tube 92) to be sucked into the main pipe 821. The sucked electrolytic product solution is mixed with the raw water in the main pipe 821 in the transition section 811 (inflow point 81) and diluted. Any appropriate configuration can be used for the aspirator 89 as long as it can reduce the pressure of the raw water and generate a Venturi effect.

[0013] 1 , the above has described an example in which raw water is used as the driving flow to suck out the electrolytic solution from the electrolytic cell 12. However, a pump provided upstream of the electrolytic cell 12 may be used to send the electrolyte aqueous solution from the electrolyte aqueous solution tank 11 to the electrolytic cell 12 and from the electrolytic cell 12 to the dilution flow path 8. The pump may be powered by the power generation circuit 15.

[0014] The dilution flow path 8 dilutes the electrolytic solution sent from the electrolytic cell 12 with raw water to produce electrolyzed water. For example, the dilution flow path 8 dilutes the electrolytic solution produced in the electrolytic cell 12 so that it meets the requirements for slightly acidic electrolyzed water (effective chlorine concentration 10 to 80 ppm, pH 5.0 to 6.5). The dilution flow path 8 discharges the diluted electrolyzed water from the electrolyzed water discharge unit 14.

[0015] The water wheel 2 is provided upstream of the inflow point 81 of the electrolytic solution in the dilution flow path 8, and a power-generating impeller 22 in the housing 21 is rotated and driven by raw water supplied from the water supply unit 13. The impeller 22 is housed in the housing 21 in the housing space V. The kinetic energy of the impeller 22 is transmitted to the power generation circuit 15. The power generation circuit 15 is, for example, an induction motor, and generates electricity through electromagnetic induction using the transmitted kinetic energy. In the power generation circuit 15, the rotor is rotated by torque transmitted from the rotating shaft of the impeller 22, and electromagnetic induction occurs due to interaction between the rotor and the stator surrounding the rotor, generating, for example, an alternating current in the rotor winding. Power may be supplied from the power generation circuit 15 to appropriate elements, for example, to the electrolytic cell 12 via a converter (not shown) or the like.

[0016] The outlet flow path 3 discharges the raw water that has acted on the impeller 22 from the accommodation space V of the housing 21 to the dilution flow path 8. In this embodiment, the outlet flow path 3 is formed inside the housing 21 and is connected to the upstream end of the piping 82. As shown in FIG. 3, part of the raw water supplied from the water supply unit 13 may bypass the impeller 22, and in this case, the discharge point of the raw water from the outlet flow path 3 may be upstream (A1 in FIG. 3) or downstream (A2 in FIG. 3) of the inlet point 81.

[0017] Returning to Figure 1, the overflow flow path 4 discharges excess raw water in the accommodation space V to the dilution flow path 8. As a result, in this embodiment, even if raw water exceeding the maximum capacity of the impeller 22 is supplied to the water turbine 2, the excess raw water is discharged, so that the smooth rotation of the impeller 22 can be maintained and good power generation efficiency can be maintained.

[0018] In this embodiment, the overflow flow path 4 causes the raw water to flow downstream of the inflow point 81 in the dilution flow path 8 (inflow point B1). As a result, in this embodiment, the electrolyzed water in which the raw water is mixed with the electrolytically produced solution can be stirred, and the electrolytically produced solution can be mixed evenly into the raw water. Note that the overflow flow path 4 may also cause the raw water to flow upstream of the inflow point 81 in the dilution flow path 8 (inflow point B2).

[0019] Any suitable configuration can be adopted for causing raw water to flow from the overflow flow path 4 into the dilution flow path 8. In this embodiment, an inner pipe 84 that constitutes the dilution flow path 8 and an outer pipe 85 that covers the inner pipe 84 and has a downstream open end 841 of the inner pipe 84 located inside are provided downstream of the inflow point 81 in the dilution flow path 8. The downstream open end 841 of the inner pipe 84 is positioned, for example, close to the outlet side of the outer pipe 85.

[0020] The outer pipe 85 has a surplus inlet 851 for the overflow flow path 4 on its inner peripheral surface that covers the inner pipe 84. The surplus inlet 851 allows surplus raw water in the turbine 2, which has been discharged into the overflow flow path 4, to flow into the outer pipe 85. The raw water that has flowed into the outer pipe 85 flows downstream within the outer pipe 85 and mixes with the electrolyzed water discharged from the inner pipe 84, thereby diluting the electrolyzed water. The electrolyzed water thus produced further flows downstream through the dilution flow path 8 and is discharged from the electrolyzed water discharge unit 14.

[0021] FIG. 4 is a diagram showing one aspect of the overflow channel 4 at the connection portion with the outer pipe 85. As shown in FIG. The overflow passage 4 at the connection portion with the outer pipe 85 may be provided with its center line C intersecting the outer peripheral surface of the inner pipe 84, and may discharge raw water toward the outer peripheral surface of the inner pipe 84 through the surplus inlet 851. In this embodiment, the raw water that flows into the outer pipe 85 from the surplus inlet 851 hits the outer peripheral surface of the inner pipe 84, disperses, and proceeds downstream within the outer pipe 85.

[0022] FIG. 5 is a diagram showing another aspect of the overflow channel 4 at the connection portion with the outer pipe 85. In FIG. The overflow flow path 4 at the connection portion with the outer pipe 85 may be oriented such that its center line C avoids the outer peripheral surface of the inner pipe 84, and raw water may be discharged through the surplus inlet 851 toward between the inner pipe 84 and the outer pipe 85. In such an embodiment, the raw water that flows into the outer pipe 85 from the surplus inlet 851 becomes a swirling flow that flows downstream within the outer pipe 85 while spiraling around the outer peripheral surface of the inner pipe 84. As a result, in each of the above examples of the overflow flow path 4, the electrolyzed water in which the electrolytically produced solution is mixed with the raw water can be agitated, and the electrolytically produced solution can be mixed evenly into the raw water.

[0023] 6A is a diagram showing the flow of raw water in the housing 21 of the water turbine 2. FIG. Impeller 22 discharges raw water supplied from the radially outer side to the radially outer side. Impeller 22 can have any suitable configuration, and in this embodiment, a plurality of curved blades 223 are provided in the circumferential direction between two plate members 222 (see FIG. 6B) attached to shaft 221. Base ends of blades 223 are connected to a circular annular wall portion 224 provided on the central side between plate members 222.

[0024] An in-casing dilution flow path 84 is formed in the casing 21 as part of the dilution flow path 8 upstream of the water turbine 2. The in-casing dilution flow path 84 opens as an inlet 83 in the inner circumferential wall 23 of the casing 21, which covers the radial outside of the impeller 22 in the accommodation space V of the casing 21.

[0025] As described above, the outflow passage 3 is formed in the housing 21. The outflow passage 3 opens as an outflow port 31 in the inner peripheral wall 23.

[0026] An internal housing overflow path 41 is formed in the housing 21 as part of the overflow path 4. The internal housing overflow path 41 opens into the inner peripheral wall 23 as an excess outlet 43. The overflow path 4 includes the internal housing overflow path 41 and a pipe 42 connected to the internal housing overflow path 41.

[0027] An inlet 83, an outlet 31, and a surplus outlet 43 are formed in this order on the inner peripheral wall 23 of the housing 21 in the rotation direction R of the impeller 22. The inlet 83 allows raw water supplied from the water supply unit 13 to flow into the accommodation space V via the dilution flow path 8. The raw water hits the blades 223 of the impeller 22, causing the impeller 22 to rotate. The raw water is transported in the rotation direction R by the impeller 22 while being positioned between the blades 223 of the impeller 22.

[0028] The outlet 31 allows the raw water in the storage space V, which is carried in the rotation direction R by the impeller 22, to flow out from the storage space V to the outlet flow path 3. The raw water that does not flow out from the outlet 31 and remains in the impeller 22 is further carried in the rotation direction R by the impeller 22.

[0029] The surplus raw water outlet 43 allows surplus raw water in the storage space V, which has been carried in the rotation direction R by the impeller 22 and passed through the outlet 31, to flow from the storage space V to the overflow passage 4. The surplus raw water in the storage space V can be discharged using an appropriate configuration. For example, the impeller 22 may be two-stage, with an inlet and an outlet formed on the inner circumferential wall around the first-stage impeller and a surplus outlet formed on the inner circumferential wall around the second-stage impeller. The surplus raw water may then pass through a gap between the first-stage impeller and its inner circumferential wall into the second-stage impeller and be discharged from the surplus outlet on the outer inner circumferential wall.

[0030] (Variation) FIG. 7 is a diagram showing the configuration of an electrolyzed water generator 1A having a constricted portion 82A at the inflow point 81. A constricted portion 82A made of piping is provided at the inlet point 81 of the dilution flow path 8. The constricted portion 82A has a smaller flow path cross-sectional area than the upstream and downstream sides of the inlet point 81 in the dilution flow path 8, and reduces the pressure of the flowing raw water, allowing the electrolytic product solution to be efficiently sucked out of the electrolytic cell 12 via the narrow tube 92. The constricted portion 82A may be a pipe having a smaller flow path cross-sectional area than the upstream and downstream pipes, or may be a constricted passage formed inside a special-shaped joint, and any appropriate configuration can be adopted.

[0031] In the electrolyzed water generator 1A, the portion of the dilution flow path 8 downstream of the inlet point 81 is configured as a single pipe rather than a double pipe, and excess raw water flows into this portion from the overflow flow path 4. In the electrolyzed water generator 1A, excess raw water can also be discharged from the water turbine 2 via the overflow flow path 4, so that the power generation efficiency of the water turbine 2 can be improved even if the amount of raw water supplied from the water supply unit 13 increases. In the electrolyzed water generator 1A, excess raw water is also caused to flow downstream of the inlet point 81 in the dilution flow path 8, and the electrolyzed water is agitated, so that the electrolytically produced solution flowing in from the inlet point 81 can be more thoroughly mixed with the raw water.

[0032] The present invention can be implemented in the embodiments without departing from its features. The embodiments, variations, and effects are merely illustrative and should not be construed as limiting the present invention. The features and structures of the embodiments and variations can be added and combined in various ways to obtain alternative configurations. [Explanation of symbols]

[0033] 1, 1A...electrolyzed water generating device, 2...water turbine, 3...first outlet flow path, 4...second outlet flow path, 8...dilution flow path, 12...electrolytic cell, 21...casing, 22...impeller, 81...inlet point, V...accommodation space.

Claims

1. an electrolytic cell that electrolyzes an aqueous electrolyte solution to generate an electrolytic product solution; a dilution flow path for diluting the electrolytic solution sent from the electrolytic cell with dilution water to produce electrolyzed water; a water turbine provided upstream of an inflow point of the electrolytic solution in the dilution flow path, the water turbine rotating an impeller for power generation within a housing by dilution water supplied from the dilution flow path; a first outlet flow path that discharges the dilution water that has acted on the impeller from the impeller accommodation space in the housing to the dilution flow path; a second outlet flow path that discharges excess dilution water in the storage space to the dilution flow path; An electrolyzed water generating device comprising:

2. The electrolyzed water generating device according to claim 1, The impeller discharges dilution water supplied from the radially outer side to the radially outer side, An electrolytic water generating device in which the inner wall of the housing covering the radially outer side of the impeller in the storage space is formed with an inlet for allowing diluted water supplied from the dilution flow path to flow into the storage space, an outlet of the first outlet flow path for allowing diluted water in the storage space to flow out of the storage space, and a surplus outlet of the second outlet flow path for allowing excess diluted water in the storage space to flow out of the storage space, in that order in the rotational direction of the impeller.

3. The electrolyzed water generating device according to claim 1, The second outlet flow path is an electrolyzed water generating device that allows dilution water to flow downstream of the inlet point in the dilution flow path.

4. The electrolyzed water generating device according to claim 3, An inner pipe constituting the dilution flow path and an outer pipe covering the inner pipe and having a downstream open end of the inner pipe located therein are provided downstream of the inflow point in the dilution flow path, An electrolyzed water generating device in which an excess inlet of the second outlet flow path for flowing diluted water into the outer pipe is provided on the inner surface of the outer pipe that covers the inner pipe.

5. The electrolyzed water generating apparatus according to claim 4, The second outlet flow path at the connection portion with the outer pipe is arranged so that its center line intersects with the outer peripheral surface of the inner pipe, and the electrolyzed water generating device discharges diluted water toward the outer peripheral surface of the inner pipe through the surplus inlet.

6. The electrolyzed water generating apparatus according to claim 4, The second outlet flow path at the connection with the outer pipe is arranged so that its center line avoids the outer peripheral surface of the inner pipe, and the electrolytic water generating device discharges diluted water toward between the inner pipe and the outer pipe through the surplus inlet.

7. The electrolyzed water generating device according to any one of claims 1 to 6, an electrolyte aqueous solution tank connected to the electrolytic cell via a connecting pipe; At the inflow point, a narrow tube having a smaller diameter than the pipe and connected to the electrolytic cell is connected to the pipe constituting the dilution flow path, and the electrolytic product solution is sucked from the electrolytic cell through the narrow tube into the dilution flow path by the water flow of dilution water flowing through the dilution flow path, An electrolyzed water generating apparatus in which the aqueous electrolyte solution is sucked from the aqueous electrolyte solution tank through the connecting pipe into the electrolytic cell by a suction pressure generated at the inflow point and transmitted to the electrolytic cell.

8. The electrolyzed water generating device according to claim 7, An electrolytic water generating device in which a constricted portion is provided at the inlet point of the dilution flow path, and the constricted portion has a smaller flow path cross-sectional area than the upstream and downstream sides of the inlet point in the dilution flow path, thereby reducing the pressure of the flowing dilution water.

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