Fluid Mixing Device

Abstract

To provide a fluid mixing device for improving mixing agitation performance of a plurality of kinds of fluid when mixing the plurality of kinds of fluid for forming mixture.SOLUTION: A fluid mixing device 1A for mixing a plurality of kinds of fluid comprises: a main body member 10; an input port member 20; and a fluid channel formation member 30. A spiral nozzle hole 31 provided on the fluid channel formation member 30 is formed by arranging a plurality of holes in a tapered conical shape, and connecting a first inflow hole 31a and a first outflow hole 31b of first fluid by a two-axis inclined hole. A straight hole 32 on the fluid channel formation member 30 is formed by connecting a second inflow hole 32a and a second outflow hole 32b of second fluid by a shaft center hole. The fluid channel formation member 30 comprises, on a tip end face 36a, a plurality of first outflow holes 31b opened on a circumference, and the second outflow hole 32b which is open at a center surrounded by the plurality of first outflow holes 31b. The fluid channel formation member 30 has the tip end face 36a on a fluid inlet area of a fluid mixing part 12.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a fluid mixing device for mixing a plurality of fluids. [Background technology]

[0002] Conventionally, a micro-bubble generator for generating micro-bubbles in a liquid has been known that includes a main body, a swirling flow forming section that forms a swirling flow of water, a flow velocity increasing section that increases the flow velocity of the swirling flow, and a gas inlet section that forms an air inlet path that communicates with the water flow path. In this micro-bubble generator, combinations of the swirling flow forming sections and the corresponding flow velocity increasing sections are arranged in parallel at multiple locations when viewed in the direction of the central axis of the main body (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-150548 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional technology, when a mixed fluid of liquid (water) and gas (air) is produced, air is introduced from outside the water due to the accelerated swirling flow, causing the water and air to merge. Therefore, the merger of the water and air becomes an outer entrainment merger in which the air moving in the axial direction on the water surface area is entrained into the accelerated swirling flow of water flowing in the axial direction. This results in a problem in that the entrainment efficiency when air is entrained inside the water flowing as an accelerated swirling flow is low, making it difficult to improve the mixing and stirring performance of the water and air.

[0005] The present invention has been made in light of the above-mentioned problems, and aims to provide a fluid mixing device that improves the mixing and stirring performance of multiple fluids when multiple fluids are mixed to produce a mixed fluid. [Means for solving the problem]

[0006] To achieve the above object, the present invention provides a fluid mixing device for mixing multiple fluids, comprising a main body member, an input port member, and a fluid path forming member. The main body member has a component mounting portion and a fluid mixing portion on a main body central axis along the flow direction of the multiple fluids. The input port member is fixed to the component mounting portion and has a first input port for introducing a first fluid from the outside and a second input port for introducing a second fluid different from the first fluid from the outside. The fluid path forming member is fixed downstream of the input port member and has a nozzle hole through which the first fluid flows from the first input port and a straight hole through which the second fluid flows from the second input port. The nozzle hole is a plurality of holes arranged in a tapered cone shape, and a first inlet and a first outlet for the first fluid are connected by a biaxially inclined hole whose central axis is inclined radially and circumferentially relative to the main body central axis. The straight hole is formed by connecting the second inlet and second outlet of the second fluid with an axial hole whose central axis coincides with the central axis of the main body. The fluid path forming member has a first outlet that is opened in a plurality of places on the circumference and a second outlet that is opened in the center surrounded by the plurality of first outlets on the tip surface, and the tip surface is arranged in the fluid inlet region of the fluid mixing section. The nozzle hole of the invention according to claim 1 has a nozzle hole inner surface inclined on two axes, and a second inlet for the first fluid is formed in the nozzle hole inner surface inclined on two axes. 1st outlet The straight hole of the invention according to claim 8 has a buffer hole at the position of the second outlet, the buffer hole having an inner diameter larger than the inner diameter of the straight hole. [Effects of the Invention]

[0007] By employing the above-described means, a swirling flow with increased velocity is ejected from the first outlet for the first fluid on the tip surface of the fluid path-forming member toward the fluid inlet region of the fluid mixing section, generating negative pressure in the central region of the tip surface of the fluid path-forming member. Because this negative pressure-generating region coincides with the position of the second outlet for the second fluid, the second fluid is subjected to a negative pressure pulling force. Therefore, the confluence of the first and second fluids becomes an inner suction confluence in which the second fluid is sucked toward the inner center of the first fluid, and the second fluid is efficiently drawn into the interior of the ejected first fluid by the swirling flow, resulting in mixing and stirring. As a result, a fluid mixing device can be provided that improves the mixing and stirring performance of multiple fluids when mixing multiple fluids to produce a mixed fluid. The invention of claim 1 can quickly start mixing of the first fluid and the second fluid in the fluid inlet region of the fluid mixing unit and can improve the mixing and stirring performance of the first fluid and the second fluid in the fluid mixing unit. In addition, the improved mixing and stirring performance in the fluid mixing unit can shorten the axial length of the fluid mixing unit, contributing to a more compact fluid mixing device. The invention of claim 8 can adjust the flow velocity of the second fluid sucked toward the inner center of the combined swirling flow to match the flow velocity of the combined swirling flow of the first fluid. As a result, the second fluid merges at an appropriate velocity toward the inner center of the combined swirling flow of the first fluid in the fluid inlet region of the fluid mixing unit, improving the merging performance of the first fluid and the second fluid. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an overall front view showing the external appearance of a fluid mixing device according to a first embodiment. [Figure 2] FIG. 1 is a side view showing the configuration of the fluid mixing device of the first embodiment as viewed from the input port member side. [Figure 3] FIG. 2 is a cross-sectional view taken along line II in FIG. 1 showing the internal configuration of the fluid mixing device of the first embodiment. [Figure 4] FIG. 2 is a cross-sectional view taken along line II-II of FIG. 2, showing the internal configuration of the fluid mixing device of the first embodiment. [Figure 5] FIG. 2 is an enlarged cross-sectional view showing a main body member of the fluid mixing device of the first embodiment. [Figure 6] FIG. 2 is a diagram showing an input port member of the fluid mixing apparatus of the first embodiment. [Figure 7] FIG. 2 is a front view showing a fluid path forming member of the fluid mixing device of the first embodiment. [Figure 8] 10 is a cross-sectional view taken along the line III-III in FIG. 9 showing the fluid path forming member of the fluid mixing device of the first embodiment. [Figure 9] 8 is a side view showing the configuration of the fluid path forming member shown in FIG. 7 as viewed from the input side. FIG. [Figure 10]9 is a longitudinal cross-sectional view showing a state in which a hole-shaped pin is inserted into one of the spiral nozzle holes formed in the fluid path forming member shown in FIG. 8. FIG. [Figure 11] 11A and 11B are front and tip configuration diagrams showing the hole-shaped pin of FIG. 10, in which the hole shape of the spiral nozzle hole is represented by an inverted shape. [Figure 12] FIG. 11 is a perspective view showing the hole-shaped pin of FIG. 10, which represents the hole shape of the spiral nozzle hole by an inverted shape. [Figure 13] 10 is a perspective view showing the configuration of the tip end surface of the fluid path forming member as viewed from the fluid mixing portion side. FIG. [Figure 14] 1 is a velocity vector diagram showing velocity vectors among the analysis results using the analytical model of the fluid mixer of Example 1. [Figure 15] 1 is a streamline diagram showing the flow lines of water and air from the analysis results using the analytical model of the fluid mixer of Example 1. FIG. [Figure 16] 1 is an air flow line diagram showing the flow lines of only air from the analysis results using the analytical model of the fluid mixer of Example 1. FIG. [Figure 17] FIG. 10 is an overall front view showing the external appearance of a fluid mixing device according to a second embodiment. [Figure 18] FIG. 10 is a vertical cross-sectional view showing the internal configuration of a fluid mixing device according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fluid mixing device according to the present invention will be described below with reference to first and second embodiments shown in the drawings. [Example]

[0010] The fluid mixing apparatus 1A of the first embodiment is an example of a fluid mixing apparatus that mixes multiple fluids, in which the first fluid is water and the second fluid is air, and generates a gas-liquid multiphase fluid by mixing the water and air. Here, "fluid" is used as a general term for liquids and gases that can flow while freely changing shape. "Multiple fluids" refers to two or more types of fluids that have different physical properties (viscosity, compressibility, etc.), which are the properties of the fluids themselves, and includes combinations of different liquids and combinations of different gases in addition to combinations of liquid and gas. An example of a combination of different liquids is the combination of water and oil.

[0011] First, the overall configuration of a fluid mixing apparatus 1A that generates a gas-liquid multiphase fluid by mixing air with water supplied at a predetermined water pressure will be described with reference to Figures 1 to 4. Here, "water" is an incompressible liquid with a higher viscosity than air, such as tap water. "Air" is an example of a compressible gas with a lower viscosity than water.

[0012] 1 to 4, the fluid mixing device 1A includes a main body member 10, an input port member 20, and a fluid path forming member 30. Each of the members 10, 20, and 30 is made of a synthetic resin material selected according to the usage environment, type of fluid, etc., and is manufactured by molding using a resin molding machine. Of course, the materials used for the members 10, 20, and 30 may be metal or a composite of metal and synthetic resin, in addition to synthetic resin.

[0013] The main body member 10 is a cylindrical member that has a member mounting section 11, a fluid mixing section 12, a diffuser section 13, and a straight pipe section 14 on a main body central axis CL along the flow direction of water and air (the flow direction from left to right in FIG. 1). The main body member 10 of Example 1 is a cylindrical member having, for example, a diameter of about 30 mm and an axial length of about 90 mm, taking into consideration that it will be used by connecting a water supply piping member to the input side.

[0014] As shown in Figures 3 and 4, the input port member 20 is fastened to the member mounting portion 11 by screws. The input port member 20 has a first input port 21 that introduces water from the outside and a second input port 22 that introduces air other than water from the outside. The first input port 21 is formed with a female thread 21a to which a water system piping member (not shown) is connected. As shown in Figures 1 and 2, an air suction pipe 23 is connected to the second input port 22.

[0015] The fluid path forming member 30 is fixed to the component mounting portion 11 at a position downstream of the input port member 20. The fluid path forming member 30 has a spiral nozzle hole 31 into which water flows in from the first input port 21 and a straight hole 32 into which air flows in from the second input port 22. The fluid path forming member 30 is subjected to a pressing force due to movement when the input port member 20 is fastened and fixed to the component mounting portion 11 with the male and female screws, and is fixed in a sandwiched state between the input port member 20 and the component mounting portion 11.

[0016] Next, with reference to FIGS. 5 to 12, the detailed configuration of each member (main body member 10, input port member 20, fluid path forming member 30) that constitutes the fluid mixing device 1A will be described.

[0017] 5, the main body member 10 has, on the main body central axis CL, a member mounting portion 11, a fluid mixing portion 12, a diffuser portion 13, and a straight pipe portion 14. The outer periphery of the outlet side of the main body member 10 is formed with a male thread portion 15 for mounting a shower head, a high-pressure cleaning head, a micro-bubble generating head, or the like (not shown).

[0018] The member attachment portion 11 is a main body hole for attaching the input port member 20 and the fluid path forming member 30. The member attachment portion 11 has a female thread portion 11a, a cylindrical inner surface portion 11b, a tapered inner surface portion 11c, and a stepped fitting surface portion 11d. The input port member 20 and the fluid path forming member 30 are attached by inserting and assembling the fluid path forming member 30 into the cylindrical inner surface portion 11b, the tapered inner surface portion 11c, and the stepped fitting surface portion 11d, and then screwing the input port member 20 into the female thread portion 11a.

[0019] The fluid mixing section 12 is a flow path that mixes and agitates the water ejected by the swirling flow from the fluid path forming member 30 with the air sucked into the center of the swirling flow. The fluid mixing section 12 has a tapered inner surface 12a that gradually reduces from an inlet side inner diameter Din from the fluid path forming member 30 to an outlet side inner diameter Dout to the diffuser section 13.

[0020] The inlet-side inner diameter Din is the inner diameter at a position where the inlet-side inner diameter 11 contacts the component mounting portion 11 and is set to be larger than the circumscribing circle of the plurality of first outlets 31b (described later). The outlet-side inner diameter Dout is the inner diameter at a position where the inlet-side inner diameter 11 contacts the diffuser portion 13 and is set to be the minimum inner diameter that provides at least the total cross-sectional area of ​​the plurality of first outlets 31b (described later). The outlet-side inner diameter Dout is set to be the maximum inner diameter that is smaller than the inlet-side inner diameter Din and is reduced to obtain a flow velocity that ensures at least the minimum flow rate allowable as an apparatus flow rate. Therefore, the outlet-side inner diameter Dout is appropriately determined depending on, for example, the inlet-side inner diameter Din, the two-axis inclination angle of the first outlets 31b, the axial length 300 of the fluid mixing portion 12, etc.

[0021] The axial length 300 of the fluid mixing section 12 is set to a length that allows the water ejected by the combined swirling flow to be mixed with the air sucked into the center of the swirling flow due to negative pressure, thereby stirring the water. The specific axial length 300 of the fluid mixing section 12 is set to a different length for each combination of fluids to be mixed, depending on the type and viscosity of the fluid. For example, once a combination of fluids to be mixed is selected, a comparative experiment of mixing and stirring performance is conducted by changing the axial length, and the length that provides the highest mixing and stirring performance is determined. Here, a first water outlet 31b and a second air outlet 32b, which are formed on the tip end surface 36a of the fluid path forming member 30 (described later), are located in the fluid inlet region of the fluid mixing section 12 where the water and air merge (see FIG. 13).

[0022] The diffuser section 13 is a flow path that converts the kinetic energy of the mixed fluid flowing in from the fluid mixing section 12 into pressure energy and generates a backflow in the mixed fluid to stir it, thereby breaking down the air mixed in the water into air bubbles. The diffuser section 13 has an expanding tapered inner surface 13a in which the inner diameter on the inlet side of the diffuser (=outlet side inner diameter Dout), into which the mixed fluid flows from the fluid mixing section 12, expands toward the straight pipe section 14 on the outlet side of the mixed fluid.

[0023] Here, the taper angle of the expanding tapered inner surface 13a of the diffuser section 13 is set to an angle that can reduce the flow velocity of the mixed flow from the fluid mixing section 12 and promote the occurrence of a backflow. In Example 1, the taper angle of the expanding tapered inner surface 13a of the diffuser section 13 is set to an angle that is larger than the taper angle of the contracting tapered inner surface 12a. However, if the rate of increase in the flow path area (= the taper angle of the expanding tapered inner surface 13a) becomes too large, flow path loss increases. For this reason, the taper angle of the expanding tapered inner surface 13a is set to an angle that promotes the occurrence of a backflow while suppressing an increase in flow path loss.

[0024] As shown in FIG. 6, the input port member 20 has a first input port 21, a second input port 22, a connecting support portion 24, a first fluid hole 25, a second fluid path 26, an outer peripheral protrusion portion 27, and an axial center protrusion portion 28.

[0025] The first input port 21 is an axial port for guiding water to the input-side outer peripheral region of the fluid path forming member 30. A female thread 21a is formed on the inner surface of the first input port 21 to which a water supply piping member (not shown) or the like is connected.

[0026] The second input port 22 is a radial port for guiding air to the axial center of the fluid path forming member 30. An air suction pipe 23 is connected to the inner surface of the second input port 22 (see FIGS. 1 and 2). Note that instead of the air suction pipe 23, a bleeder plug or the like that draws in outside air may be provided in the second input port 22. Also, the air suction pipe 23 may be eliminated.

[0027] The connecting support portion 24 is a member that connects the intermediate positions of the first input ports 21 in the diametric direction, and distributes the water from the first input port 21 and the air from the second input port 22 and guides them to the fluid path forming member 30.

[0028] The first fluid hole 25 is formed in the connecting support pillar 24 and is a flow path that divides water guided in the axial direction from the first input port 21 into two directions and guides the water to the input-side outer circumferential region of the fluid path forming member 30. The first fluid hole 25 is composed of a pair of arc-shaped holes 25a, 25b that are divided into two by the connecting support pillar 24 (see FIGS. 2 and 3). A water storage region that is prepared for the supply of water to the fluid path forming member 30 is formed between the opening end faces 25c of the pair of arc-shaped holes 25a, 25b and a step surface 34a of the fluid path forming member 30, which will be described later (see FIGS. 3 and 4).

[0029] The second fluid path 26 is formed in the connecting support strut 24 and is a path that guides air from the second input port 22 to the axial center of the fluid path forming member 30. The second fluid path 26 is composed of radial flow paths 26a and axial flow paths 26b. One end of the radial flow path 26a is connected to the second input port 22 and the other end is opened to the center position of the connecting support strut 24. One end of the axial flow path 26b is connected to the radial flow path 26a and the other end is opened to the tip end surface 28a of the axial protrusion 28. Note that while FIG. 6 shows the radial flow path 26a configured to allow air to flow in only from above, it may also be configured to allow air to flow in from multiple directions, such as both above and below or three equiangular directions. Furthermore, when radial flow paths that introduce fluid from multiple directions are provided, different types of fluid may be used in each radial flow path. However, when different types of fluids are used, it is preferable to select fluids with similar viscosities, such as when one fluid is air and the other fluid is also a gas.

[0030] The outer peripheral protrusion 27 is an annular protrusion that protrudes in an annular shape from the outer periphery of the end face of the input port member 20 on the side of the main body member, and is used to screw the input port member 20 to the member attachment portion 11 of the main body member 10. A male thread portion 27a is formed on the outer periphery of the outer peripheral protrusion 27, and is screwed to the female thread portion 11a of the member attachment portion 11. In Example 1, a seal that prevents water leakage is ensured by elastic deformation of the material due to the pressure applied to the screw fixing portion between the male thread portion 27a and the female thread portion 11a. Note that if the screw fixing portion cannot prevent water leakage, a seal member may be provided at the screw fixing portion.

[0031] The axial center protrusion 28 is a protrusion that protrudes in a cylindrical shape from the center of the end face of the input port member 20 on the main body member side and connects the axial flow path 26b to the straight hole 32 formed in the fluid path forming member 30 (see FIGS. 3 and 4). The tip end surface 28a of the axial center protrusion 28 protruding toward the main body member is in pressure contact with the rear end surface 33a (see FIG. 8) of the axial center cylindrical portion 33 of the fluid path forming member 30. In the first embodiment, a sealing property that prevents air leakage is ensured by elastic deformation of the material due to the pressure contact force applied to the tip end surface 28a and the rear end surface 33a. Note that if air leakage cannot be prevented by the pressure contact force between the tip end surface 28a and the rear end surface 33a, a sealing member may be provided on the pressure contact surface.

[0032] 7 to 9, the fluid path forming member 30 has a spiral nozzle hole 31 (nozzle hole), a straight hole 32, an axial columnar portion 33, a cylindrical portion 34, a tapered conical portion 35, and a stepped cylindrical portion 36. Here, the external shape of the fluid path forming member 30 excluding the spiral nozzle hole 31 and the straight hole 32 is formed in the shape of a bridge integrally having the axial columnar portion 33, the cylindrical portion 34, the tapered conical portion 35, and the stepped cylindrical portion 36, as shown in FIGS.

[0033] The axial center cylindrical portion 33 corresponds to the axial center protrusion 28 of the input port member 20 described above, and the front end surface 28a of the axial center protrusion 28 is in pressure contact with the rear end surface 33a. The outer diameter of the rear end surface 33a of the axial center cylindrical portion 33 is formed to be larger than the outer diameter of the front end surface 28a of the axial center protrusion 28, thereby connecting the axial flow passage 26b and the straight hole 32 to each other.

[0034] The cylindrical portion 34 has an outer peripheral surface with an outer diameter that corresponds to the cylindrical inner surface portion 11b of the component mounting portion 11. The tapered conical portion 35 has a tapered conical surface that corresponds to the tapered inner surface portion 11c of the component mounting portion 11. The stepped cylindrical portion 36 has an outer peripheral surface with an outer diameter that corresponds to the stepped fitting surface portion 11d of the component mounting portion 11 (see FIG. 5). In this way, the fluid path forming member 30 has a shape that corresponds to the shape of the component mounting portion 11 of the main body member 10, and can be assembled by inserting the fluid path forming member 30 into the main body member 10 in the axial direction. The configurations of the spiral nozzle hole 31 and the straight hole 32 formed in the fluid path forming member 30 will be described below.

[0035] The fluid path forming member 30 has a first outlet 31b for water formed by the spiral nozzle hole 31 and a second outlet 32b for air formed by the straight hole 32 formed on its tip surface 36a. The tip surface 36a of the fluid path forming member 30 is disposed at a position facing the fluid inlet region of the fluid mixing section 12.

[0036] The spiral nozzle hole 31 is a nozzle hole that generates a compound swirling flow while accelerating the water supplied by a predetermined water pressure. The spiral nozzle hole 31 has a first inlet 31a formed in a step surface 34a between the axial column portion 33 and the cylindrical portion 34, and a first outlet 31b formed in a tip surface 36a of the stepped cylindrical portion 36. Here, the "compound swirling flow" refers to a swirling flow that is a compound combination of an "overall swirling flow" and an "individual swirling flow." The overall swirling flow and individual swirling flows will be described later.

[0037] Six spiral nozzle holes 31 are formed. The holes are arranged in a tapered cone shape. Each spiral nozzle hole 31 is formed by connecting a first water inlet 31a and a first water outlet 31b via a biaxially inclined hole whose hole center axis HC is inclined radially and circumferentially relative to the main body center axis CL. Therefore, when six water flows are accelerated and ejected from the first outlets 31b of the six spiral nozzle holes 31 in the biaxially inclined direction, an overall swirling flow is created by the six twisted water flows whose intersections of the two inclined axes do not coincide with each other. The "twisted water flow" refers to the water flow in which the water ejected from the first outlets 31b of the spiral nozzle holes 31 moves in a spiral shape along the tapered inner surface 12a of the fluid mixing section 12.

[0038] Here, "inclined in the radial direction" refers to a first inclination angle θ1 at which the hole center axis HC of the spiral nozzle hole 31 approaches the main body center axis CL as it moves from the first inlet 31a to the first outlet 31b, as shown in FIG. 8. Furthermore, "inclined in the circumferential direction" refers to a second inclination angle θ2 at which the hole center axis HC of the spiral nozzle hole 31 moves away from the main body center axis CL as it moves from the first inlet 31a to the first outlet 31b. In other words, the second inclination angle θ2 is expressed as the circumferential angle between a first radial line R1 connecting the main body center axis CL and the center of the first inlet 31a and a second radial line R2 connecting the main body center axis CL and the center of the first outlet 31b, as shown in FIG. 9. In Example 1, the first inclination angle θ1 and the second inclination angle θ2 are both 15°. In addition, the hole center axis HC shown in Figure 9 represents a biaxial tilt state in the radial direction (inner radial direction in Figure 9) and circumferential direction (clockwise circumferential direction in Figure 9) when viewing the spiral nozzle hole 31 from the axial direction.

[0039] The spiral nozzle hole 31 has inner surface protrusions 31c that protrude spirally from the first water inlet 31a toward the first water outlet 31b on the inner surface of the nozzle hole, which is inclined on two axes. In Example 1, three inner surface protrusions 31c are formed that protrude in a mountain shape at 120° intervals toward the inner surface of the spiral nozzle hole 31. Therefore, water moves spirally through the spiral nozzle hole 31 with the inner surface protrusions 31c formed therein while accelerating in speed, thereby creating individual swirling flows in each of the six spiral nozzle holes 31.

[0040] The detailed hole shape of the spiral nozzle hole 31 will be described with reference to Figures 10 to 13. Hereinafter, as shown in Figure 10, the pin shape when a pin of the same shape is inserted into the spiral nozzle hole 31 (the inverted shape of the spiral nozzle hole 31) will be referred to as the spiral nozzle hole shape 31'.

[0041] As shown in Fig. 11, the spiral nozzle hole shape 31' is divided into a first section S1 extending from the first inlet 31a to a midpoint in the spiral nozzle hole shape 31' and a second section S2 extending from the midpoint in the spiral nozzle hole shape 31' to the first outlet 31b. A connecting section S3 is set between the first section S1 and the second section S2. The first section S1 is the longest section, accounting for approximately 80% of the total length. The length relationship between the sections is first section S1 > second section S2 > connecting section S3.

[0042] The first section S1 is an inner protrusion section having inner protrusions 31c on the inner surface of the tapered hole of the spiral nozzle hole 31. The inner protrusions 31c are represented by recessed grooves in the spiral nozzle hole shape 31'. The second section S2 is a cylindrical section having a uniform diameter hole rather than a tapered hole. The connecting section S3 is a conical section smoothly connecting the inner protrusion section and the uniform diameter hole section. The tip surfaces 36a of the six first outlets 31b are inclined tip surfaces perpendicular to the hole center axis HC. Therefore, the tip surface shape of the first outlets 31b is not a flat surface perpendicular to the main body center axis CL. In other words, the tip surface shape of the first outlets 31b is an uneven inclined surface with a stepped surface and a fan-shaped inclined surface repeated six times in the circumferential direction, as shown in FIG. 13.

[0043] The opening shape of the first inlet 31a of the spiral nozzle hole 31 is elliptical when the three inner surface protrusions 31c are removed (see the dashed line in Figure 9 which shows the spiral nozzle hole 31 when the three inner surface protrusions 31c are removed). On the other hand, the opening shape of the first outlet 31b of the spiral nozzle hole 31 is circular, as is clear from the tip surface shape of the spiral nozzle hole shape 31' in Figure 12. The term "circular shape" refers to a curved shape formed by a set of points equidistant from a fixed point (center point), and is used to clearly distinguish it from an elliptical shape. Note that the term "circular shape" does not refer to a shape that requires high circularity, and also includes, for example, circular shapes created by resin molding.

[0044] The detailed shape of the straight hole 32 will be described with reference to Figures 8 and 13. The straight hole 32 is a hole that guides air from the outside toward the center surrounded by multiple first outlets 31b on the tip surface 36a of the fluid path forming member 30 by negative pressure. The straight hole 32 is formed by connecting the second air inlet 32a and second outlet 32b with an axial hole. Here, the axial hole refers to a hole whose hole center axis AC coincides with the main body center axis CL.

[0045] The straight hole 32 has a buffer hole 37 at the position of the second outlet 32b, the buffer hole 37 having an inner diameter larger than the inner diameter of the straight hole 32 (see FIG. 13). The buffer hole 37 is provided to slow down and adjust the flow rate of air drawn in due to the generation of negative pressure, and the inner diameter and length of the buffer hole 37 are set according to the fluid selected. In particular, the flow rate due to negative pressure drawing is significantly affected by the viscosity of the selected fluid. For example, for fluids with low viscosity such as air, whose flow rate increases due to negative pressure drawing, the inner diameter and length of the buffer hole 37 are set to slow down the flow rate in accordance with the jetting speed of water caused by the swirling flow. Conversely, for fluids with high viscosity that do not increase the flow rate due to negative pressure drawing, the buffer hole 37 may have a small volume, or the buffer hole 37 may be eliminated entirely.

[0046] Next, the gas-liquid multiphase fluid generation action of mixing water W and air A to generate a gas-liquid multiphase fluid M will be described with reference to the analysis examples in Figures 14 to 16. Here, as the analysis example, an example showing velocity vectors (Figure 14), streamlines of water and air (Figure 15), and streamlines of air only (Figure 16) when analytical conditions are given for mixing water (water pressure = 0.1 MPa) and air (atmospheric pressure = 0 MPa) to generate a gas-liquid multiphase fluid will be shown.

[0047] When water W flows into the first input port 21 of the input port member 20 under a predetermined water pressure (0.1 MPa), it passes through the first fluid hole 25, which is a pair of arc-shaped holes 25a, 25b (see FIGS. 2 and 3), and reaches the first inlet 31a of the spiral nozzle hole 31 formed in the fluid path forming member 30. In the fluid path forming member 30, the water W that reaches the first inlet 31a of the spiral nozzle hole 31, which is a nozzle hole (see FIG. 8), moves toward the first outlet 31b while accelerating, and individual swirling flows are created by the inner surface protrusions 31c formed on the inner surface of the spiral nozzle hole 31. Then, when the water W flows out of the first outlet 31b of the six spiral nozzle holes 31, an overall swirling flow is created by six bundles of twisted water flows, due to the biaxially inclined configuration of the six spiral nozzle holes 31.

[0048] As a result, a combined swirling flow (total swirling flow + individual swirling flows) with increased speed is ejected from the first outlets 31b for water W provided in the tip end surface 36a of the fluid path forming member 30 toward the fluid inlet region of the fluid mixing section 12. For this reason, the conical region surrounded by the tip end surface 36a of the fluid path forming member 30 and the inner surfaces of the combined swirling flows ejected from the six first outlets 31b becomes a primary negative pressure generating region 100 where negative pressure is generated by the Venturi effect, as shown in Fig. 14. Here, the "Venturi effect" is one of the effects in fluid mechanics, and refers to the phenomenon whereby a low-pressure portion or a negative pressure portion is created when the cross-sectional area of ​​the fluid flow is narrowed to increase the flow velocity.

[0049] The primary negative pressure generating region 100 formed in the center portion of the tip surface 36a of the fluid path forming member 30 coincides with the position of the second outlet port 32b of the straight hole 32 through which the air A flows. Therefore, the air A present in the air passage such as the straight hole 32 of the fluid path forming member 30 is subjected to a negative pressure drawing force corresponding to the pressure difference between atmospheric pressure and the negative pressure. Therefore, the external air A is drawn into the inner center of the water W from the second input port 22 of the input port member 20 via the radial flow paths 26a, the axial flow paths 26b, the straight hole 32, and the buffer hole 37. Here, the inner center of the water W into which the air A is drawn refers to the apex region of the tapered cone when six bundles of water W are ejected from the six spiral nozzle holes 31 in a tapered cone shape.

[0050] Therefore, the confluence of the water W and the air A becomes an inward suction confluence in which the air A is sucked toward the inner center of the water W. The region where the water W and the air A start to confluence is the fluid inlet region of the fluid mixing section 12 where the tip surface 36a of the fluid path forming member 30 is disposed. Therefore, in the fluid mixing section 12, the air A is efficiently taken into the water W being sprayed out by the combined swirl flow, and mixing and stirring of the water W and the air A begins.

[0051] When water W passes through the fluid mixing section 12 toward the fluid outlet, its speed increases while swirling toward the diffuser section 13, as shown in the streamline characteristics of FIG. 15. As shown in the streamline characteristics of air A in FIG. 16, air A flows while swirling inside the center of the water W due to the combined swirling flow, and is efficiently entrained in the swirling water W, thereby being mixed and stirred. Note that, since the fluid mixing section 12 has a contracting tapered inner surface 12a, the water W due to the combined swirling flow passes toward the outlet while increasing in speed. For this reason, as shown in FIG. 14, a secondary negative pressure generation region 200 is formed by the Venturi effect in the outer peripheral region of the boundary between the fluid mixing section 12 and the diffuser section 13.

[0052] Next, the mixed fluid of water W and air A that leaves the fluid mixing section 12 flows into the diffuser section 13, where the kinetic energy of the mixed fluid that flows in from the fluid mixing section 12 is converted into pressure energy, causing the flow velocity to decrease. Therefore, in the diffuser section 13 and the straight pipe section 14, backflows and vortex flows are generated in the mixed fluid, as shown by the velocity vectors (arrows) in Figure 13, and the generated backflows and vortex flows cause the mixed fluids to collide with each other, resulting in a stirring effect. This stirring effect breaks down the band-like air mass mixed into the water W and breaks it down into air bubbles, resulting in the generation of a gas-liquid multiphase fluid M with countless air bubbles scattered throughout the water W.

[0053] As described above, the fluid mixing apparatus 1A of the first embodiment provides the following effects.

[0054] (1) A fluid mixing device 1A for mixing multiple fluids includes a main body member 10, an input port member 20, and a fluid path forming member 30. The main body member 10 has a member mounting portion 11 and a fluid mixing portion 12 on a main body central axis CL along the flow direction of the multiple fluids. The input port member 20 is fixed to the member mounting portion 11 and has a first input port 21 for introducing a first fluid (water W) from the outside and a second input port 22 for introducing a second fluid (air A) different from the first fluid from the outside. The fluid path forming member 30 is fixed at a downstream position of the input port member 20 and has a nozzle hole (spiral nozzle hole 31) through which the first fluid flows in from the first input port 21 and a straight hole 32 through which the second fluid flows in from the second input port 22. The nozzle hole (spiral nozzle hole 31) is formed by arranging multiple holes in a tapered cone shape, connecting a first inlet 31a and a first outlet 31b for the first fluid with a biaxially inclined hole whose hole center axis HC is inclined radially and circumferentially with respect to the body center axis CL. The straight hole 32 is formed by connecting a second inlet 32a and a second outlet 32b for the second fluid with an axial hole whose hole center axis AC is aligned with the body center axis CL. The fluid path forming member 30 has a tip surface 36a formed with multiple first outlets 31b opened on the circumference and a second outlet 32b opened in the center surrounded by the multiple first outlets 31b. The tip surface 36a of the fluid path forming member 30 is located in the fluid inlet region of the fluid mixing section 12. Therefore, when a plurality of fluids (water W, air A) are mixed to generate a mixed fluid (gas-liquid multiphase fluid M), a fluid mixer 1A can be provided that has improved performance in mixing and stirring a plurality of fluids.

[0055] (2) The nozzle hole is a spiral nozzle hole 31 having inner surface protrusions 31c that protrude spirally from the first inlet 31a for the first fluid (water W) toward the first outlet 31b on the biaxially inclined nozzle hole inner surface. Therefore, the swirling flow ejected from the first outlet 31b of the spiral nozzle hole 31 becomes a compound swirling flow that combines the overall swirling flow created by the biaxially inclined nozzle hole with the individual swirling flows created by the inner surface protrusions 31c. This allows the first fluid (water W) and the second fluid (air A) to begin mixing quickly in the fluid inlet region of the fluid mixing section 12, and improves the mixing and stirring performance of the first fluid (water W) and the second fluid (air A) in the fluid mixing section 12. Additionally, the improved mixing and stirring performance in the fluid mixing section 12 allows the axial length 300 of the fluid mixing section 12 to be shortened, contributing to a more compact fluid mixing device 1A.

[0056] (3) The spiral nozzle hole 31 is divided into a first section S1 extending from the first inlet 31a to a midpoint and a second section S2 extending from the midpoint to the first outlet 31b. The first section S1 is an inner surface protrusion section having an inner surface protrusion 31c on the inner surface of the nozzle hole, and the second section S2 is a uniform diameter section having a uniform diameter hole. The tip surface 36a of the first outlet 31b is an inclined surface perpendicular to the hole center axis HC. Therefore, the hole connecting to the first outlet 31b is a uniform diameter hole, and the opening shape of the spiral nozzle hole 31 at the first outlet 31b for the first fluid (water W) is a perfect circle rather than an ellipse. This reduces the disruption of the flow line of the first fluid (water W) ejected from the circular first outlet 31b of the spiral nozzle hole 31 compared to when the first fluid (water W) is ejected from an elliptical outlet.

[0057] (4) The fluid path forming member 30 has a buffer hole 37 with an inner diameter larger than that of the straight hole 32 at the position of the second outlet 32b, which opens in the center surrounded by the first outlet 31b of the first fluid (water W). Therefore, the flow velocity of the second fluid (air A) toward the fluid inlet region of the fluid mixing unit 12 due to negative pressure suction is slowed by the buffer hole 37, whose flow path cross-sectional area is larger than that of the straight hole 32. Therefore, the flow velocity of the second fluid (air A) sucked toward the inner center of the combined swirling flow can be adjusted to match the flow velocity of the combined swirling flow of the first fluid (water W). Therefore, in the fluid inlet region of the fluid mixing unit 12, the second fluid (air A) merges at an appropriate speed toward the inner center of the combined swirling flow of the first fluid (water W), improving the merging performance of the first fluid (water W) and the second fluid (air A).

[0058] (5) The fluid mixing section 12 has a tapered inner surface 12a that reduces the inlet inner diameter Din of the fluids (water W, air A) flowing in from the fluid path-forming member 30 to an outlet inner diameter Dout. Negative pressure is generated in the fluid inlet region of the fluid mixing section 12. For this reason, if the fluid mixing section had an inner surface without a taper, the mixed fluid would be drawn toward the fluid inlet side by the negative pressure, causing it to slow down or stagnate. In contrast, the fluid mixing section 12 has a tapered inner surface 12a that promotes acceleration, ensuring the movement of the mixed fluid at a predetermined flow rate. This prevents the mixed fluid passing through the fluid mixing section 12 from slowing down or stagnation, further improving the mixing and stirring performance of the first fluid (water W) and the second fluid (air A).

[0059] (6) The fluid mixing unit 12 sets the minimum inner diameter of the outflow side inner diameter Dout to an inner diameter that provides at least the total cross-sectional area of ​​the multiple first outflow ports 31b. Therefore, by setting the minimum inner diameter of the outflow side inner diameter Dout to an inner diameter that provides the total cross-sectional area of ​​the multiple first outflow ports 31b, an increase in flow path resistance due to excessive narrowing can be suppressed. Therefore, in the fluid mixing unit 12, an increase in flow path resistance due to excessive narrowing of the outflow side inner diameter Dout can be suppressed. Note that, by setting the maximum inner diameter of the outflow side inner diameter Dout to an inner diameter that provides a flow velocity that ensures at least the minimum flow rate allowable as the device flow rate, a decrease in flow velocity due to excessive opening of the outflow side inner diameter Dout can be suppressed.

[0060] (7) The main body member 10 has a diffuser section 13 located downstream and adjacent to the fluid mixing section 12. The diffuser section 13 has an expanding tapered inner surface 13a, where the inner diameter of the diffuser inlet side into which the mixed fluid flows from the fluid mixing section 12 expands toward the mixed fluid outlet side. Therefore, in the diffuser section 13 with the expanding tapered inner surface 13a, the kinetic energy of the mixed fluid flowing in from the fluid mixing section 12 is converted into pressure energy, reducing the flow velocity and generating backflow and vortex flow in the mixed fluid. Therefore, in the diffuser section 13, the generated backflow and vortex flow effectively agitate the mixed fluid, thereby generating a mixed fluid (gas-liquid multiphase fluid M) in which minute particles of the second fluid (air A) are dispersed throughout the first fluid (water W). [Example]

[0061] While Example 1 is an apparatus for mixing two types of fluids, Example 2 is an example of an apparatus that can mix three types of fluids by adding one type of fluid in addition to the two types of fluids.

[0062] 17 and 18, the configuration of a fluid mixer 1B of Example 2 will be described, which generates a three-component fluid mixture by mixing an additive liquid agent (third fluid) with a gas-liquid multiphase fluid obtained by mixing water (first fluid) supplied at a predetermined water pressure with air (second fluid). Here, the additive liquid agent refers to, for example, various cleaning liquids selected for each application.

[0063] As shown in FIGS. 17 and 18, the fluid mixing device 1B includes a main body member 10, an input port member 20, and a fluid path forming member 30.

[0064] The main body member 10 is a cylindrical member and has a member mounting portion 11, a fluid mixing portion 12, a diffuser portion 13, and a straight pipe portion 14 on the main body central axis CL along the flow direction of the water and air (the flow direction from left to right in Figure 17).

[0065] The fluid mixing section 12 has a convergent tapered inner surface 12a, as in Example 1. The diffuser section 13 is disposed adjacent to the downstream position of the fluid mixing section 12, and has an divergent tapered inner surface 13a.

[0066] At the boundary between the fluid mixing section 12 and the diffuser section 13, there are provided a third input port 16 and radial flow paths 17 for introducing the additive liquid agent radially from the outside. One end of the radial flow paths 17 communicates with the third input port 16, and the other end opens at the boundary between the fluid mixing section 12 and the diffuser section 13. An additive liquid agent suction pipe 18 is connected to the third input port 16. Note that other configurations are the same as those of the fluid mixing device 1A of the first embodiment, so detailed description will be omitted.

[0067] Next, a description will be given of the operation of generating a three-component mixture fluid by mixing an additive liquid with a gas-liquid multiphase fluid obtained by mixing water with air.

[0068] First, in the fluid mixing section 12 having the tapered inner surface 12a, the water flows through the fluid mixing section 12 due to the combined swirling flow while increasing in speed from the inlet side to the outlet side. Therefore, as described in the first embodiment, a secondary negative pressure generation region 200 (see FIG. 14) is formed in the outer peripheral boundary region between the fluid mixing section 12 and the diffuser section 13. Therefore, focusing on the secondary negative pressure generation region 200, holes (third input port 16 and radial flow path 17) perpendicular to the main body central axis CL are opened toward the secondary negative pressure generation region 200, and a suction flow path for the additive liquid agent is provided in the fluid mixing device 1B of the second embodiment.

[0069] Therefore, the additive liquid sucked by negative pressure suction via the additive liquid suction pipe 18, the third input port 16, and the radial flow passage 17 is introduced perpendicular to the water by the combined swirling flow. As a result, the additive liquid mixes with the water while tearing the water apart in the shear direction by the combined swirling flow. At this time, the swirling water increases the mixing and stirring effect of the additive liquid, and a three-component mixed fluid is generated by mixing the additive liquid with the gas-liquid multiphase fluid M, which is a mixture of water and air. Note that the gas-liquid multiphase fluid generation operation, which generates the gas-liquid multiphase fluid M by mixing water and air, is the same as that of the fluid mixing apparatus 1A of the first embodiment, so a description thereof will be omitted.

[0070] As described above, the fluid mixing apparatus 1B of the second embodiment has the following advantages in addition to the advantages of the first embodiment.

[0071] (8) The fluid mixing section 12 has a tapered inner surface 12a that gradually narrows from an inlet inner diameter Din, through which the fluid from the fluid path-forming member 30 flows, to an outlet inner diameter Dout. The main body member 10 has a diffuser section 13 located downstream adjacent to the fluid mixing section 12. At the boundary between the fluid mixing section 12 and the diffuser section 13, there are a third input port 16 and a radial flow path 17 that introduce a third fluid (additive liquid agent) radially from the outside. That is, the fluid mixing section 12 having the tapered inner surface 12a generates a secondary negative pressure at the outlet side of the fluid mixing section 12. Therefore, when the third input port 16 and the radial flow path 17 are provided in the secondary negative pressure generating region 200 in a direction perpendicular to the main body central axis CL, the third fluid (additive liquid agent) is subjected to a drawing force due to the secondary negative pressure and is introduced perpendicular to the first fluid (water) by the combined swirling flow. Therefore, by simply adding a simple flow path configuration that utilizes the generation of secondary negative pressure, it is possible to generate a three-component mixed fluid by mixing a first fluid (water) with a second fluid (air) and then further mixing it with a third fluid (additive liquid agent).

[0072] The fluid mixing device of the present invention has been described above based on Examples 1 and 2, but the specific configuration is not limited to these Examples. Changes and additions to the design are permitted as long as they do not deviate from the gist of the invention according to each claim in the scope of the claims.

[0073] In the first and second embodiments, an example in which six holes are arranged in a tapered cone shape is shown as the spiral nozzle holes 31. However, the spiral nozzle holes are not limited to six holes, and may be, for example, an example in which three or more holes are arranged in a tapered cone shape.

[0074] In Examples 1 and 2, the nozzle hole is a biaxially inclined hole, and the spiral nozzle hole 31 has an inner surface protrusion 31c that protrudes helically from the nozzle hole inner surface, forming a preferred example in which an individual swirling flow is added to the overall swirling flow to form a compound swirling flow. However, the nozzle hole may be a biaxially inclined nozzle hole without an inner surface protrusion, and an overall swirling flow may be generated by the biaxially inclined nozzle hole. Furthermore, when the nozzle hole has an inner surface protrusion that protrudes helically from the inner surface, Example 1 shows an example in which there are three inner surface protrusions, but the number is not limited to three and may be at least one inner surface protrusion. In Example 1, an example in which the cross-sectional shape of the inner surface protrusion is mountain-shaped is shown, but the cross-sectional shape of the inner surface protrusion is not limited to a mountain-shaped shape and may be any shape that can generate individual swirling flows.

[0075] In the first and second embodiments, when forming a spiral nozzle hole 31 with a biaxial tilt, the first axial tilt angle θ1 and the second circumferential tilt angle θ2 are set to the same tilt angle of 15°. However, when forming a spiral nozzle hole with a biaxial tilt, the first axial tilt angle θ1 and the second circumferential tilt angle θ2 are not limited to being set to the same tilt angle, and it is of course also possible to set the first axial tilt angle θ1 and the second circumferential tilt angle θ2 to different angles.

[0076] In Examples 1 and 2, when forming a spiral nozzle hole 31 tilted on two axes, the tip surface 36a of the first outlet 31b of the first fluid is an inclined surface perpendicular to the hole central axis HC, and the opening shape of the spiral nozzle hole 31 at the first outlet 31b is a perfect circle. However, when forming a spiral nozzle hole tilted on two axes, if a first fluid is selected that does not cause a problem with turbulence in the streamline ejected from the first outlet, the fluid may be ejected from an elliptical outlet.

[0077] In the first and second embodiments, the straight hole 32 formed in the fluid path forming member 30 has a buffer hole 37 with an inner diameter larger than the hole inner diameter at the position of the second outlet 32b. However, if a fluid with high viscosity is selected as the second fluid, the fluid path forming member may not have a buffer hole. Furthermore, in the case of an embodiment with a buffer hole, the hole inner diameter or hole length may be different from that of the first embodiment.

[0078] In the first and second embodiments, the fluid mixing section 12 has a tapered inner surface 12a along the entire axial length 300, and the outlet inner diameter Dout is set smaller than the inlet inner diameter Din. However, the fluid mixing section may have a tapered inner surface along at least a portion of the entire axial length. For example, the tapered inner surface may be a tapered inner surface from the start position to an intermediate position, and the remaining portion may be a constant diameter inner surface. Alternatively, the entire axial length may be a constant diameter inner surface from the start position to an intermediate position, and the remaining portion may be a tapered inner surface. Furthermore, the entire axial length may be a constant diameter inner surface in the front and rear regions, and the entire axial length may be a tapered inner surface in the middle region.

[0079] In the first and second embodiments, the diffuser section 13 having the enlarged tapered inner surface 13a is disposed downstream of the fluid mixing section 12. However, a straight pipe section whose inner diameter expands sharply from the inner diameter on the outlet side of the fluid mixing section may be disposed downstream of the fluid mixing section.

[0080] In Example 2, the first fluid is water, the second fluid is air, and the third fluid is an additive liquid agent, and an example is shown in which a three-component mixed fluid is generated by mixing the water and air mixture with the additive liquid agent. However, the first and second fluids are not limited to the above-mentioned example of a combination of water and air. Furthermore, the third fluid is not limited to an additive liquid agent (liquid), and may be other liquids or gases. [Explanation of symbols]

[0081] 1A Fluid Mixing Device 10 Main body member 11 Component attachment part 12 Fluid mixing section 12a Reduced tapered inner surface 13 Diffuser section 13a Expanded tapered inner surface 20 Input port member 21 First input port 22 Second input port 30 Fluid path forming member 31 Spiral nozzle hole (nozzle hole) 31a 1st inlet 31b 1st outlet 31c Inner protrusion 32 straight holes 32a 2nd inlet 32b 2nd outlet 36a Tip surface 37 buffer holes 1B Fluid Mixing Device 16 Third input port 17 Radial flow passage CL body center axis HC hole center axis W Water (1st fluid) A Air (second fluid) M Gas-liquid multiphase fluid (mixed fluid) S1 First Section S2 2nd Section Din: Inlet side inner diameter of the fluid mixing section 12 Dout: Outlet side inner diameter of the fluid mixing section 12

Claims

1. A fluid mixing device for mixing a plurality of fluids, a main body member having a member mounting portion and a fluid mixing portion on a central axis of the main body along the flow direction of the plurality of fluids; an input port member fixed to the member mounting portion, the input port member having a first input port for introducing a first fluid from the outside and a second input port for introducing a second fluid different from the first fluid from the outside; a fluid path forming member fixed at a downstream position of the input port member, the fluid path forming member having a nozzle hole through which the first fluid from the first input port flows and a straight hole through which the second fluid from the second input port flows, the nozzle hole is formed by arranging a plurality of holes in a tapered cone shape, and connecting a first inlet and a first outlet of the first fluid by a biaxially inclined hole whose hole central axis is inclined in a radial direction and a circumferential direction with respect to the main body central axis, the straight hole is formed by connecting the second inlet and the second outlet for the second fluid by an axial hole whose hole central axis is aligned with the main body central axis, the fluid path forming member has a tip end surface formed with the first outlets, which are opened in a plurality of locations on a circumference, and the second outlet, which is opened in a central portion surrounded by the plurality of first outlets, and the tip end surface is disposed in a fluid inlet region of the fluid mixing section; the nozzle hole is a spiral nozzle hole having an inner surface inclined on two axes, the inner surface of the nozzle hole having an inner protrusion that protrudes spirally from the first inlet toward the first outlet of the first fluid.

2. 2. The fluid mixing device according to claim 1, The spiral nozzle hole divides a section from the first inlet to the first outlet of the first fluid into a first section from the first inlet to an intermediate position and a second section from the intermediate position to the first outlet, The first section is an inner surface protrusion section having the inner surface protrusion on the inner surface of the nozzle hole, the second section is a same diameter hole section having a same diameter hole formed therein, and the tip surface of the first outlet is an inclined surface perpendicular to the central axis of the hole. A fluid mixing device characterized by:

3. The fluid mixing device according to claim 1 or 2, The fluid path forming member has a buffer hole at the position of the second outlet, the buffer hole having an inner diameter larger than the inner diameter of the straight hole. A fluid mixing device characterized by:

4. 4. The fluid mixing device according to claim 1, The fluid mixing portion has a tapered inner surface that gradually reduces from an inflow side inner diameter into which the fluid from the fluid path forming member flows to an outflow side inner diameter. A fluid mixing device characterized by:

5. 5. The fluid mixing device according to claim 4, The fluid mixing section sets the minimum inner diameter of the outlet side inner diameter to an inner diameter that provides a total cross-sectional area of ​​at least the plurality of first outlets. A fluid mixing device characterized by:

6. 6. The fluid mixing device according to claim 1, the body member has a diffuser section located downstream adjacent the fluid mixing section; The diffuser section has an expanding tapered inner surface in which the inner diameter of the diffuser inlet side into which the mixed fluid flows from the fluid mixing section expands toward the outlet side of the mixed fluid. A fluid mixing device characterized by:

7. 7. The fluid mixing device according to claim 1, the fluid mixing portion has a tapered inner surface that gradually reduces from an inflow side inner diameter into which the fluid from the fluid path forming member flows to an outflow side inner diameter, the body member has a diffuser section located downstream adjacent the fluid mixing section; a third input port and a radial flow path for introducing a third fluid from the outside in a radial direction at a boundary position between the fluid mixing section and the diffuser section; A fluid mixing device characterized by:

8. A fluid mixing device for mixing a plurality of fluids, a main body member having a member mounting portion and a fluid mixing portion on a central axis of the main body along the flow direction of the plurality of fluids; an input port member fixed to the member mounting portion, the input port member having a first input port for introducing a first fluid from the outside and a second input port for introducing a second fluid different from the first fluid from the outside; a fluid path forming member fixed at a downstream position of the input port member, the fluid path forming member having a nozzle hole through which the first fluid from the first input port flows and a straight hole through which the second fluid from the second input port flows, the nozzle hole is formed by arranging a plurality of holes in a tapered cone shape, and connecting a first inlet and a first outlet of the first fluid by a biaxially inclined hole whose hole central axis is inclined in a radial direction and a circumferential direction with respect to the main body central axis, the straight hole is formed by connecting the second inlet and the second outlet for the second fluid by an axial hole whose hole central axis is aligned with the main body central axis, the fluid path forming member has a tip end surface formed with the first outlets, which are opened in a plurality of locations on a circumference, and the second outlet, which is opened in a central portion surrounded by the plurality of first outlets, and the tip end surface is disposed in a fluid inlet region of the fluid mixing section; A buffer hole having an inner diameter larger than the inner diameter of the straight hole is provided at the position of the second outlet. A fluid mixing device characterized by:

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