JP2023050374A - Fluid mixing device - Google Patents

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

The present invention relates to a fluid mixing device for mixing multiple fluids.

Conventionally, a microbubble generator for generating microbubbles in a liquid includes a main body, a swirling flow forming section for forming a swirl flow by water, a flow speed increasing section for increasing the speed of the swirling flow, and a gas introduction section that forms an air introduction path that communicates with the water flow path. In the micro-bubble generator, a combination of a swirling flow forming portion and a corresponding flow speed increasing portion is provided in parallel so that there are a plurality of combinations when viewed in the central axis direction of the main body (for example, Patent Document 1 reference).

JP 2015-150548 A

In the prior art described above, when a mixed fluid of liquid (water) and gas (air) is generated, air is introduced from the outside of the water by the speed-increasing swirling flow to merge the water and the air. Therefore, the confluence of the water and the air becomes an outer entrainment confluence in which the air moving in the axial direction on the surface of the water is entrained in the water in the speed-increasing swirling flow flowing in the axial direction. For this reason, there is a problem that the efficiency of taking air into the inside of the water flowing as an accelerated swirling flow is low, and improvement in mixing and agitating performance of water and air cannot be expected.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a fluid mixing apparatus that improves mixing and stirring performance of a plurality of fluids when mixing a plurality of fluids to generate a mixed fluid. do.

To achieve the above object, the present invention provides a fluid mixing device for mixing a plurality of fluids, comprising a body member, an input port member, and a fluid path forming member. The body member has a member mounting portion and a fluid mixing portion on the body central axis along the direction of flow of the plurality of fluids. The input port member is fixed to the member 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 into which the first fluid from the first input port flows and a straight hole into which the second fluid from the second input port flows. . The nozzle hole has a plurality of holes arranged in a tapered conical shape, and the first inlet and the first outlet for the first fluid are arranged so that the center axis of the hole is inclined radially and circumferentially with respect to the center axis of the main body. It is formed by connecting with a biaxially inclined hole. The straight hole is formed by connecting a second inlet and a second outlet for the second fluid by a central hole whose central axis coincides with the central axis of the main body. The fluid path forming member has a plurality of first outflow openings formed on the circumference and a second outflow opening opening in the central portion surrounded by the plurality of first outflow openings. , with its leading end face positioned at the fluid inlet region of the fluid mixing section.

By adopting the above-described means, an accelerated swirling flow is ejected from the first outlet for the first fluid provided on the tip surface of the fluid passage forming member toward the fluid inlet region of the fluid mixing section. A negative pressure is generated in the central region of the tip face. Since this negative pressure generation area coincides with the position where the second outflow port for the second fluid is arranged, the second fluid receives a negative pressure drawing action force. Therefore, the confluence of the first fluid and the second fluid becomes an inner suction confluence in which the second fluid is sucked toward the inner central portion of the first fluid, and the second fluid is ejected by the swirling flow inside the first fluid. Fluids are efficiently taken in and mixed and agitated. As a result, it is possible to provide a fluid mixing device that improves the performance of mixing and agitating a plurality of fluids when generating a mixed fluid by mixing a plurality of fluids.

1 is an overall front view showing the external shape of a fluid mixing device of Example 1. FIG. FIG. 2 is a side view showing the configuration of the fluid mixing device of Example 1 as viewed from the input port member side; 2 is a cross-sectional view taken along line II of FIG. 1, showing the internal configuration of the fluid mixing device of Example 1. FIG. 3 is a cross-sectional view taken along line II-II in FIG. 2, showing the internal configuration of the fluid mixing device of Example 1. FIG. 4 is an enlarged cross-sectional view showing the main body member of the fluid mixing device of Example 1. FIG. 4 is a diagram showing an input port member of the fluid mixing device of Example 1. FIG. FIG. 2 is a front view showing a fluid passage forming member of the fluid mixing device of Example 1; FIG. 10 is a cross-sectional view taken along line III-III in FIG. 9 showing the fluid passage forming member of the fluid mixing device of Example 1; FIG. 8 is a side view showing the configuration of the fluid passage forming member shown in FIG. 7 viewed from the input side; FIG. 9 is a longitudinal sectional view showing a state in which a hole-shaped pin is inserted into one of the spiral nozzle holes formed in the fluid passage forming member shown in FIG. 8; 11 is a front view configuration diagram and a tip view configuration diagram showing the hole-shaped pin of FIG. 10 in which the hole shape of the spiral nozzle hole is represented by an inverted shape. FIG. 11 is a perspective view showing the hole-shaped pin of FIG. 10, in which the hole shape of the spiral nozzle hole is represented by an inverted shape; FIG. FIG. 4 is a perspective view showing the configuration of the tip surface of the fluid path forming member viewed from the fluid mixing section side; FIG. 10 is a velocity vector diagram showing velocity vectors in analysis results using the analysis model of the fluid mixing device of Example 1; 4 is a streamline diagram showing streamlines of water and air among analysis results using the analysis model of the fluid mixing device of Example 1. FIG. 4 is an air streamline diagram showing streamlines of only air among the analysis results using the analysis model of the fluid mixing device of Example 1. FIG. FIG. 10 is an overall front view showing the external shape of the fluid mixing device of Example 2; 6 is a longitudinal sectional view showing the internal configuration of the fluid mixing device of Example 2. FIG.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the fluid mixing apparatus by this invention is demonstrated based on Example 1 and Example 2 shown in drawing.

The fluid mixing device 1A of the first embodiment is a fluid mixing device for mixing a plurality of fluids, which uses water as a first fluid and air as a second fluid, and mixes water and air to generate a gas-liquid multiphase fluid. For example. Here, the term "fluid" is used as a generic term for liquids, gases, and the like that can flow while freely changing their shape. The term “plurality of fluids” refers to two or more types of fluids having different physical properties (viscosity, compressibility, etc.), which are the properties of the fluid itself. It also includes combinations of gases. Combinations of different types of liquids include, for example, combinations of water and oil.

First, referring to FIGS. 1 to 4, the overall configuration of a fluid mixing device 1A that mixes air with water supplied at a predetermined water pressure to generate a gas-liquid multiphase fluid will be described. 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.

The fluid mixing device 1A includes a main body member 10, an input port member 20, and a fluid path forming member 30, as shown in FIGS. Each member 10, 20, 30 is made of a synthetic resin material selected according to, for example, the usage environment and the type of fluid, and is manufactured by molding using a resin molding machine. As materials for the members 10, 20, and 30, metal materials, composite materials of metal materials and synthetic resin materials, etc. may be used other than synthetic resin materials.

The body member 10 is a cylindrical member, and has a member mounting portion 11 and a fluid mixing unit on the body center axis CL along the flow direction of water and air (the flow direction from the left side to the right side in FIG. 1). It has a portion 12 , a diffuser portion 13 and a straight pipe portion 14 . The body member 10 of Example 1 is a cylindrical member having a diameter of about 30 mm and an axial length of about 90 mm, for example, in consideration of connecting a water pipe member to the input side.

As shown in FIGS. 3 and 4, the input port member 20 is fastened and fixed to the member mounting portion 11 by screwing. The input port member 20 has a first input port 21 for introducing water from the outside and a second input port 22 for introducing air different from water from the outside. The first input port 21 is formed with a female screw 21a to which a water pipe member (not shown) is connected. An air suction pipe 23 is connected to the second input port 22 as shown in FIGS.

The fluid path forming member 30 is fixed at a position downstream of the input port member 20 in the member mounting portion 11 . The fluid path forming member 30 has a spiral nozzle hole 31 into which water flows from the first input port 21 and a straight hole 32 into which air flows from the second input port 22 . The fluid path forming member 30 receives a pressing force due to movement when the input port member 20 is tightened and fixed to the member mounting portion 11 by the female and male threads, and is sandwiched between the input port member 20 and the member mounting portion 11 . Fixed.

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) constituting the fluid mixing device 1A will be described.

As shown in FIG. 5, the main body member 10 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. A male screw portion 15 is formed on the outflow side outer peripheral portion of the main body member 10 to attach a shower head, a high-pressure cleaning head, a fine bubble generation head, and the like (not shown).

The member mounting portion 11 is a body hole for mounting the input port member 20 and the fluid path forming member 30 . The member attachment portion 11 has a female screw portion 11a, a cylindrical inner surface portion 11b, a tapered inner surface portion 11c, and a step fitting surface portion 11d. The input port member 20 and the fluid passage forming member 30 are attached by inserting the fluid passage forming member 30 into the cylindrical inner surface portion 11b, the tapered inner surface portion 11c, and the stepped fitting surface portion 11d. This is done by fixing the port member 20 with screws.

The fluid mixing portion 12 is a flow path for mixing and stirring the water ejected by the swirl flow from the fluid path forming member 30 and the air sucked into the center of the swirl flow. The fluid mixing portion 12 has a reduced tapered inner surface 12 a in which the inner diameter Din on the inflow side from the fluid path forming member 30 is gradually reduced to the inner diameter Dout on the outflow side to the diffuser portion 13 .

The inflow side inner diameter Din is the inner diameter at the position in contact with the member mounting portion 11, and is set to an inner diameter larger than the circumscribed circle of the plurality of first outflow ports 31b described later. The outflow-side inner diameter Dout is the inner diameter at the position in contact with the diffuser portion 13, and is set to the minimum inner diameter at which the total cross-sectional area of at least a plurality of first outflow ports 31b, which will be described later, is obtained. Note that the outflow side inner diameter Dout is smaller than the inflow side inner diameter Din, and the inner diameter is the maximum inner diameter when the diameter is reduced so as to obtain a flow velocity that at least ensures the minimum flow rate allowed as the device flow rate. set. Therefore, the outflow side inner diameter Dout is appropriately determined according to, for example, the inflow side inner diameter Din, the biaxial inclination angle of the first outflow port 31b, the axial length 300 of the fluid mixing portion 12, and the like.

The axial length 300 of the fluid mixing portion 12 is set to a length that allows water ejected by the composite swirl flow to be mixed with air sucked into the center of the swirl flow by negative pressure and stirred. A specific axial length 300 of the fluid mixing portion 12 is set to a different length depending on the type and viscosity of the fluids for each combination of fluids to be mixed. For example, when a combination of fluids to be mixed is selected, a comparison experiment of mixing and stirring performance is performed by changing the length in the axial direction, and the length that provides high mixing and stirring performance is determined. Here, in the fluid inlet region of the fluid mixing section 12 where water and air join, there are a first water outlet 31b and a second air outlet 31b formed on the tip surface 36a of the fluid path forming member 30, which will be described later. 32b are arranged (see FIG. 13).

The diffuser unit 13 converts the kinetic energy of the mixed fluid flowing from the fluid mixing unit 12 into pressure energy, generates a backflow in the mixed fluid, and agitates the mixed fluid to subdivide the air mixed with water into air bubbles. It is a flow path to The diffuser portion 13 has an enlarged tapered inner surface 13a formed by enlarging the diffuser inflow side inner diameter (=outflow side inner diameter Dout) into which the mixed fluid flows from the fluid mixing portion 12 toward the straight pipe portion 14 on the outflow side of the mixed fluid. have.

Here, the taper angle of the expanded tapered inner surface 13a of the diffuser portion 13 is set to an angle that can reduce the flow velocity of the mixed flow from the fluid mixing portion 12 and promote the occurrence of backflow. In Example 1, the taper angle of the expanded tapered inner surface 13a of the diffuser portion 13 is set to be larger than the taper angle of the reduced tapered inner surface 12a. However, if the rate of increase in the channel area (=the taper angle of the enlarged tapered inner surface 13a) becomes too large, the channel loss increases. For this reason, the taper angle of the expanded tapered inner surface 13a is set to an angle that suppresses an increase in flow path loss while promoting the occurrence of reverse flow.

As shown in FIG. 6, the input port member 20 includes a first input port 21, a second input port 22, a connecting strut portion 24, a first fluid hole 25, a second fluid passage 26, and an outer peripheral protrusion. 27 and an axial protrusion 28 .

The first input port 21 is an axial port for guiding water to the input-side peripheral region of the fluid path forming member 30 . The inner surface of the first input port 21 is formed with a female screw 21a to which a water system piping member (not shown) is connected.

The second input port 22 is a radial port for guiding air to the axial center of the fluid passage 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). Instead of the air suction pipe 23, the second input port 22 may be provided with a bleeder plug or the like for sucking outside air. Also, a configuration in which the air suction pipe 23 is eliminated may be employed.

The connecting strut portion 24 diametrically connects the intermediate position of the first input port 21 and distributes the water from the first input port 21 and the air from the second input port 22 to guide them to the fluid path forming member 30 . is a member of

The first fluid hole 25 is formed in the connecting strut portion 24 and serves as a flow path that divides the water axially guided from the first input port 21 into two directions and guides it to the input-side peripheral region of the fluid path forming member 30 . . The first fluid hole 25 is composed of a pair of arcuate holes 25a and 25b divided by the connecting strut portion 24 (see FIGS. 2 and 3). Between the opening end face 25c of the pair of arc-shaped holes 25a and 25b and the step surface 34a of the fluid path forming member 30, which will be described later, there is a water storage area for supplying water to the fluid path forming member 30. is formed (see FIGS. 3 and 4).

The second fluid channel 26 is a channel that is formed in the connecting strut portion 24 and guides the air from the second input port 22 to the axial center portion of the fluid channel forming member 30 . The second fluid channel 26 is composed of a radial channel 26a and an axial channel 26b. One end of the radial flow path 26 a communicates with the second input port 22 , and the other end is opened up to the central position of the connecting strut portion 24 . One end of the axial flow path 26 b communicates with the radial flow path 26 a , and the other end opens to the tip surface 28 a of the axial projection 28 . As for the radial flow path 26a, FIG. 6 shows a configuration in which air is introduced only from above. good. In addition, when there are radial flow passages for introducing fluid from a plurality of directions, different types of fluid may be used in the respective radial flow passages. However, when different types of fluids are used, it is preferable to select fluids with similar viscosities, such as one being air and the other being gas.

The outer peripheral protrusion 27 is an annular protrusion that protrudes in an annular shape from the outer peripheral portion of the end surface of the input port member 20 on the side of the main body member, and screws and fixes the input port member 20 to the member mounting portion 11 of the main body member 10 . A male threaded portion 27 a is formed on the outer peripheral surface of the outer peripheral projection portion 27 and fixed to the female threaded portion 11 a of the member mounting portion 11 by screwing. In the first embodiment, the sealing performance to prevent water leakage is ensured by elastic deformation of the material due to the pressure contact force applied to the screw fixing portion between the male screw portion 27a and the female screw portion 11a. If the screw fixing portion cannot prevent water leakage, the screw fixing portion may be provided with a sealing member.

The axial projection 28 projects in a columnar shape from the center of the end surface of the input port member 20 on the side of the body member, and communicates the axial flow path 26b and the straight hole 32 formed in the fluid path forming member 30 with each other. (see FIGS. 3 and 4). A distal end surface 28 a of the axial protrusion 28 protruding toward the main body member is pressed against a rear end surface 33 a (see FIG. 8 ) of the axial cylindrical portion 33 of the fluid passage forming member 30 . In Embodiment 1, the sealing performance to prevent air leakage is ensured by elastic deformation of the material due to the pressure contact force applied to the front end surface 28a and the rear end surface 33a. If air leakage cannot be prevented due to the pressure contact force between the front end surface 28a and the rear end surface 33a, a sealing member may be provided on the pressure contact surfaces.

As shown in FIGS. 7 to 9, the fluid path forming member 30 includes a spiral nozzle hole 31 (nozzle hole), a straight hole 32, an axial cylindrical portion 33, a cylindrical portion 34, a tapered conical portion 35, and a stepped cylindrical portion 36 . Here, the external shape of the fluid passage forming member 30 excluding the spiral nozzle hole 31 and the straight hole 32 is, as shown in FIGS. It is formed in a piece shape integrally with the cylindrical portion 36 .

The shaft center column portion 33 corresponds to the shaft center projection portion 28 of the input port member 20 described above, and the front end face 28a of the shaft center projection portion 28 is pressed against the rear end face 33a. The axially cylindrical portion 33 has a rear end surface 33a with a larger outer diameter than the distal end surface 28a of the axial projection 28, so that the axial flow path 26b and the straight hole 32 are communicated with each other.

The cylindrical portion 34 has an outer peripheral surface with an outer diameter corresponding to the cylindrical inner surface portion 11 b of the member mounting portion 11 . The tapered conical portion 35 has a tapered conical surface corresponding to the tapered inner surface portion 11 c of the member mounting portion 11 . The stepped cylindrical portion 36 has an outer peripheral surface with an outer diameter corresponding to the stepped fitting surface portion 11d of the member mounting portion 11 (see FIG. 5). In this manner, the shape of the fluid passage forming member 30 corresponds to the shape of the member mounting portion 11 of the main body member 10, so that the fluid passage forming member 30 can be assembled by inserting the fluid passage forming member 30 into the main member 10 in the axial direction. Attached. 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.

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 on the tip surface 36a. The tip surface 36 a of the fluid path forming member 30 is arranged at a position facing the fluid inlet region of the fluid mixing section 12 .

The spiral nozzle hole 31 is a nozzle hole that creates a compound swirling flow while increasing the speed of water supplied at a predetermined water pressure. The spiral nozzle hole 31 has a first inlet 31a formed in a stepped surface 34a between the axially cylindrical portion 33 and the cylindrical portion 34, and a first outlet 31b formed in a tip end surface 36a of the stepped cylindrical portion 36. , have Here, the "composite swirl flow" means a swirl flow in which the "overall swirl flow" and the "individual swirl flow" are combined in a composite manner. The general swirl flow and the individual swirl flow will be described later.

Six spiral nozzle holes 31 are formed. The arrangement shape of each hole is tapered conical arrangement. The spiral nozzle hole 31 is formed by connecting a first water inlet 31a and a first water outlet 31b with a biaxially inclined hole in which the hole central axis HC is inclined radially and circumferentially with respect to the main body central axis CL. are doing. Therefore, when six bundles of water flow are spouted from the first outlets 31b of the six spiral nozzle holes 31 in the two-axis tilt direction at an accelerated speed, the six bundles of twisted water flow whose intersections of the two-axis tilts do not coincide with each other will create a total flow. A swirling flow is created. The term “twisted water flow” refers to a water flow in which water ejected from the first outlet 31 b of the spiral nozzle hole 31 spirals along the reduced tapered inner surface 12 a of the fluid mixing section 12 .

Here, "inclined in the radial direction" means that, as shown in FIG. , the first angle of inclination θ1 approaches the main body center axis CL as it goes toward . Further, "inclined in the circumferential direction" means that the hole center axis HC of the spiral nozzle hole 31 with respect to the main body center axis CL is inclined in one direction in the circumferential direction as it goes from the first inlet 31a to the first outlet 31b. It means having a second inclination angle θ2 that separates from . In other words, as shown in FIG. 9, the second tilt angle θ2 is defined by a first radial line R1 connecting the center of the main body CL and the center of the first inlet 31a, and the center of the main body CL and the first outlet 31b. is represented by a circumferential angle formed by a second radial line R2 connecting the centers of the . In addition, in Example 1, the first inclination angle .theta.1 and the second inclination angle .theta.2 are the same inclination angle of 15 degrees. Further, the hole center axis HC shown in FIG. 9 is biaxially inclined in the radial direction (inner diameter direction in FIG. 9) and the circumferential direction (clockwise circumferential direction in FIG. 9) when the spiral nozzle hole 31 is viewed from the axial direction. represents the state.

The spiral nozzle hole 31 has an inner surface protrusion 31c that spirally protrudes from the first water inlet 31a toward the first water outlet 31b on the inner surface of the nozzle hole that is biaxially inclined. In Example 1, three inner surface projections 31c projecting in a mountain shape toward the inner surface of the spiral nozzle hole 31 at intervals of 120° are formed. Therefore, the water spirally moves through the spiral nozzle hole 31 in which the inner surface projection 31c is formed, while accelerating, so that individual swirling flows are created in each of the six spiral nozzle holes 31 .

A detailed hole shape of the spiral nozzle hole 31 will be described with reference to FIGS. 10 to 13. FIG. Hereinafter, as shown in FIG. 10, the pin shape (reversed shape of the spiral nozzle hole 31) when a pin of the same shape is inserted into the spiral nozzle hole 31 is referred to as a spiral nozzle hole shape 31'.

As shown in FIG. 11, the spiral nozzle hole shape 31' has a section from the first inlet 31a to the first outlet 31b, a first section S1 from the first inlet 31a to a midway position, and a section S1 from the midway position. and a second section S2 up to the first outflow port 31b. A connecting section S3 is set between the first section S1 and the second section S2. Note that the first section S1 is the longest section, which occupies about 80% of the whole. The length of each section has a relationship of first section S1>second section S2>connected section S3.

The first section S<b>1 is an inner surface protrusion section having an inner surface protrusion 31 c on the inner surface of the tapered hole of the spiral nozzle hole 31 . In addition, the inner surface projection 31c is represented by a groove in the spiral nozzle hole shape 31'. The second section S2 is not a tapered hole but has a cylindrical shape, and is a same-diameter hole section in which a same-diameter hole is formed. The connecting section S3 is a conical hole section that smoothly connects the inner projection section and the same diameter hole section. The tip end faces 36a of the six first outflow ports 31b are formed in an inclined tip end face shape orthogonal to the hole central axis HC. Therefore, the tip surface shape of the first outflow port 31b does not become a flat surface perpendicular to the main body central axis CL. That is, as shown in FIG. 13, the shape of the tip surface of the first outflow port 31b is an uneven inclined surface in which the stepped surface and the fan-shaped inclined surface are repeated six times in the circumferential direction.

The opening shape of the first inlet 31a of the spiral nozzle hole 31 is an elliptical shape when the three inner surface projections 31c are removed (the spiral nozzle hole 31 when the three inner surface projections 31c in FIG. 9 are removed is (see dashed line shown). On the other hand, the shape of the opening of the first outflow port 31b of the spiral nozzle hole 31 is a perfect circle, as is clear from the tip surface shape of the spiral nozzle hole shape 31' in FIG. A "perfect circular shape" is a curved shape formed by a set of points having the same distance from a fixed point (center point), and is used to clearly distinguish it from an elliptical shape. It should be noted that the "perfect circular shape" is not a shape that requires a high degree of circularity, but also includes, for example, a circular shape created by resin molding.

A detailed hole shape of the straight hole 32 will be described with reference to FIGS. 8 and 13. FIG. The straight hole 32 is a hole that guides air from the outside toward the central portion surrounded by the plurality of first outlets 31b on the distal end surface 36a of the fluid passage forming member 30 by drawing in negative pressure. The straight hole 32 is formed by connecting a second air inlet 32a and a second air outlet 32b with an axial hole. Here, the axial hole refers to a hole in which the hole center axis AC of the straight hole 32 is aligned with the main body center axis CL.

The straight hole 32 has a buffer hole 37 having an inner diameter larger than that of the straight hole 32 at the position of the second outflow port 32b (see FIG. 13). The buffer hole 37 is provided to reduce and adjust the flow velocity of the air drawn in due to the generation of the negative pressure, and the hole inner diameter and hole length of the buffer hole 37 are set according to the selected fluid. In particular, the viscosity of the selected fluid is greatly involved in the flow velocity due to the drawing of negative pressure. For example, when the viscosity of air is low and the flow velocity is increased by drawing in the negative pressure, the hole inner diameter and hole length of the buffer hole 37 are set to be reduced in accordance with the jetting speed of the water caused by the swirling flow. Conversely, if the viscosity is high and the negative pressure drawing does not increase the flow velocity, the volume of the buffer hole 37 may be reduced, or the buffer hole 37 itself may be eliminated.

Next, the gas-liquid multiphase fluid generating action of mixing water W and air A to generate gas-liquid multiphase fluid M will be described with reference to the analysis examples of FIGS. 14 to 16 . Here, as an example of analysis, the velocity vector (Fig. 14) and An example representing streamlines of air (FIG. 15) and streamlines of air only (FIG. 16) is shown.

When water W with a predetermined water pressure (0.1 MPa) flows into the first input port 21 of the input port member 20, it passes through the first fluid hole 25 formed by the pair of arc-shaped holes 25a and 25b (see FIGS. 2 and 3). , and reaches the first inlet 31 a of the spiral nozzle hole 31 formed in the fluid path forming member 30 . In the fluid passage forming member 30, the water W that has reached the first inlet 31a (see FIG. 8) of the spiral nozzle hole 31 by the nozzle hole moves toward the first outlet 31b while accelerating, and flows through the spiral nozzle. The inner projections 31c formed on the inner surface of the hole 31 create individual swirling flows. Then, when the water W flows out from the first outlets 31b of the six spiral nozzle holes 31, the six spiral nozzle holes 31 are arranged to have a biaxially inclined structure, thereby creating an overall swirl flow by six bundles of twisted water flows. be

Therefore, a composite swirl flow (overall swirl flow+individual swirl flow) accelerated from the first outlet 31b of the water W provided in the tip surface 36a of the fluid path forming member 30 toward the fluid inlet region of the fluid mixing section 12. will erupt. Therefore, as shown in FIG. 14, the conical region surrounded by the tip end surface 36a of the fluid passage forming member 30 and the inner surface of the compound swirl flow ejected from the six first outlets 31b forms a venturi. As a result, it becomes a primary negative pressure generating region 100 in which negative pressure is generated. Here, the "Venturi effect" is one of the effects of fluid dynamics, and is a phenomenon in which when the cross-sectional area of a fluid flow is narrowed and the flow velocity is increased, a low pressure area or a negative pressure area with low pressure is created. Say.

The primary negative pressure generation region 100 formed in the central portion of the tip end surface 36a of the fluid passage forming member 30 and the position where the second outlet 32b of the straight hole 32 through which the air A flows are arranged coincide with each other. . Therefore, the air A existing in the air passage such as the straight hole 32 of the fluid passage forming member 30 is subjected to a negative pressure drawing action force corresponding to the differential pressure between the atmospheric pressure and the negative pressure. Therefore, the external air A flows from the second input port 22 of the input port member 20 through the radial flow path 26a, the axial flow path 26b, the straight hole 32, and the buffer hole 37 to the inner center of the water W. sucked in. Here, the inner central portion of the water W into which the air A is sucked refers to the apex region of the tapered cone shape when six bundles of water W are jetted from the six spiral nozzle holes 31 in a tapered cone shape.

Therefore, the confluence of the water W and the air A becomes an inner suction confluence in which the air A is sucked toward the inner center of the water W. A region where the water W and the air A begin to merge becomes a fluid inlet region of the fluid mixing section 12 where the tip surface 36a of the fluid path forming member 30 is arranged. Therefore, in the fluid mixing section 12, the air A is efficiently taken into the water W jetted out by the composite swirling flow, and the water W and the air A are mixed and agitated.

Then, when the water W passes through the fluid mixing portion 12 toward the fluid outlet, the speed increases while turning toward the diffuser portion 13 as shown in the streamline characteristics of FIG. 15 . Then, as shown in the streamline characteristics of the air A in FIG. 16, the air A is efficiently caught in the swirling water W by flowing while swirling in the inner central portion of the water W due to the composite swirling flow. Stir mixed. In addition, since the fluid mixing section 12 has the reduced tapered inner surface 12a, the water W generated by the complex swirling flow passes toward the outlet while increasing in speed. For this reason, as shown in FIG. 14, a secondary negative pressure generating region 200 is formed by the venturi effect in the boundary peripheral region between the fluid mixing portion 12 and the diffuser portion 13 .

Next, the mixed fluid of water W and air A coming out of the fluid mixing section 12 flows into the diffuser section 13, and the kinetic energy of the mixed fluid flowing in from the fluid mixing section 12 is converted into pressure energy, thereby decreasing the flow velocity. do. Therefore, in the diffuser part 13 and the straight tube part 14, as shown by the velocity vectors (arrows) in FIG. A stirring action is added by doing so. Due to this stirring action, the band-shaped air mass mixed with the water W is divided and subdivided into air bubbles, and the gas-liquid multiphase fluid M in which countless air bubbles are scattered throughout the water W is generated. Become.

As described above, in the fluid mixing device 1A of the first embodiment, the effects listed below can be obtained.

(1) A fluid mixing device 1A for mixing a plurality of fluids, comprising a main body member 10, an input port member 20, and a fluid path forming member 30. The body member 10 has a member attachment portion 11 and a fluid mixing portion 12 on the body center axis CL along the flow direction of a plurality of 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 21 for introducing a second fluid (air A) different from the first fluid from the outside. and an input port 22 . 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) into which the first fluid from the first input port 21 flows, and a second fluid from the second input port 22. and a straight hole 32 through which fluid flows. The nozzle hole (spiral nozzle hole 31) has a plurality of holes arranged in a tapered conical shape, and the first inlet 31a and the first outlet 31b for the first fluid are arranged along the hole center axis with respect to the body center axis CL. The HC is formed by connecting with a biaxially inclined hole that is inclined in the radial direction and the circumferential direction. The straight hole 32 is formed by connecting a second inlet 32a and a second outlet 32b for the second fluid by a central hole in which the hole central axis AC is aligned with the main body central axis CL. The fluid path forming member 30 has a plurality of first outflow ports 31b formed on the circumference and a second outflow port 32b formed in the central portion surrounded by the plurality of first outflow ports 31b. It is formed on the surface 36a. The fluid path forming member 30 has a distal end surface 36 a arranged in the fluid inlet region of the fluid mixing section 12 . For this reason, when mixing a plurality of fluids (water W and air A) to generate a mixed fluid (gas-liquid multiphase fluid M), it is desirable to provide a fluid mixing device 1A that improves the mixing and stirring performance of the plurality of fluids. can be done.

(2) The nozzle hole is a spiral nozzle having an inner surface protrusion 31c spirally protruding from the first inlet 31a of the first fluid (water W) toward the first outlet 31b on the inner surface of the nozzle hole formed by two-axis inclination. It is hole 31 . Therefore, the swirl flow ejected from the first outlet 31b of the spiral nozzle hole 31 is a composite swirl flow in which the individual swirl flow created by the inner projection 31c is added to the overall swirl flow created by the biaxially inclined nozzle holes. Become. Therefore, mixing of the first fluid (water W) and the second fluid (air A) can be quickly started in the fluid inlet region of the fluid mixing section 12, and the first fluid (water W) and the second fluid (air A) can be quickly mixed in the fluid mixing section 12. Mixing and stirring performance of the fluid (air A) can be improved. In addition, by improving the mixing and stirring performance of the fluid mixing section 12, the axial length 300 of the fluid mixing section 12 can be shortened, which contributes to downsizing of the fluid mixing device 1A.

(3) The spiral nozzle hole 31 has a section from the first inlet 31a to the first outlet 31b, a first section S1 from the first inlet 31a to an intermediate position, and a section S1 from the intermediate position to the first outlet 31b. is divided into the second section S2. The first section S1 is an inner surface projection section having an inner surface projection 31c on the inner surface of the nozzle hole, the second section S2 is an equal diameter hole section in which an equal diameter hole is formed, and the tip surface 36a of the first outlet 31b is The inclined surface is perpendicular to the hole center axis HC. Therefore, the hole connected to the first outflow port 31b has the same diameter, and the opening shape of the spiral nozzle hole 31 at the first outflow port 31b for the first fluid (water W) becomes a circular shape instead of an elliptical shape. . Therefore, the disturbance of the streamline of the first fluid (water W) ejected from the circular first outlet 31b of the spiral nozzle hole 31 can be suppressed as compared with the case of ejecting from the elliptical outlet. .

(4) The fluid path forming member 30 has an inner diameter larger than the hole inner diameter of the straight hole 32 at the position of the second outlet 32b opened in the center surrounded by the first outlet 31b for the first fluid (water W). has an enlarged buffer hole 37. Therefore, the flow velocity of the second fluid (air A) directed to the fluid inlet region of the fluid mixing section 12 by negative pressure suction is reduced by the buffer hole 37 having a flow passage cross-sectional area 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 complex swirl flow can be adjusted to match the flow velocity of the first fluid (water W) of the complex swirl flow. For this reason, in the fluid inlet region of the fluid mixing section 12, the second fluid (air A) joins at an appropriate speed toward the inner center of the composite swirling flow of the first fluid (water W), and the first fluid ( It is possible to improve the merging performance of the water W) and the second fluid (air A).

(5) The fluid mixing portion 12 has a reduced tapered inner surface 12a in which the inflow side inner diameter Din of the fluid (water W, air A) flowing from the fluid passage forming member 30 is reduced to the outflow side inner diameter Dout. Here, a negative pressure is generated in the fluid inlet area of the fluid mixing section 12 . For this reason, for example, if the fluid mixing section has a non-tapered inner surface, the mixed fluid may decelerate or stagnate due to the negative pressure that draws the mixed fluid toward the fluid inlet side. On the other hand, the fluid mixing section 12 has a reduced tapered inner surface 12a that promotes speed increase, so that it becomes a section in which the movement of the mixed fluid at a predetermined flow rate is ensured. Therefore, in the fluid mixing section 12, the mixed fluid passing through the fluid mixing section 12 is prevented from decelerating or stagnation, and the mixing and stirring performance of the first fluid (water W) and the second fluid (air A) is improved. can be further improved.

(6) The fluid mixing unit 12 sets the minimum inner diameter of the outflow side inner diameter Dout to an inner diameter with which the total cross-sectional area of at least the plurality of first outflow ports 31b is obtained. Therefore, by setting the minimum inner diameter of the outflow side inner diameter Dout to an inner diameter that can obtain the total cross-sectional area of the plurality of first outflow ports 31b, an increase in flow path resistance due to excessive throttling can be suppressed. Therefore, in the fluid mixing section 12, it is possible to suppress an increase in the flow path resistance due to excessive narrowing of the outflow side inner diameter Dout. In addition, if the maximum inner diameter of the outflow side inner diameter Dout is set to an inner diameter that provides a flow velocity that ensures at least the minimum flow rate allowed as the device flow rate, it is possible to suppress a decrease in flow velocity due to excessive opening of the outflow side inner diameter Dout. can.

(7) The body member 10 has a diffuser section 13 at a downstream position adjacent to the fluid mixing section 12 . The diffuser portion 13 has an enlarged tapered inner surface 13a in which the inner diameter of the diffuser inflow side into which the mixed fluid from the fluid mixing portion 12 flows is enlarged toward the outflow side of the mixed fluid. Therefore, in the diffuser portion 13 having the enlarged tapered inner surface 13a, the kinetic energy of the mixed fluid flowing from the fluid mixing portion 12 is converted into pressure energy, the flow velocity of the mixed fluid decreases, and the mixed fluid generates reverse flow and swirling flow. Therefore, in the diffuser part 13, the mixed fluid is effectively agitated by the generated reverse flow and vortex flow, so that minute second fluid (air A) is scattered throughout the inside of the first fluid (water W). A mixed fluid (gas-liquid multiphase fluid M) can be generated.

Example 2 is an example of an apparatus capable of mixing three types of fluids by adding one type of fluid in addition to the two types of fluids, whereas Example 1 is an apparatus for mixing two types of fluids. is.

With reference to FIGS. 17 and 18, three types of gas-liquid multiphase fluid, which is a mixture of air (second fluid) and water (first fluid) supplied at a predetermined water pressure, are mixed with an additive liquid agent (third fluid). A configuration of a fluid mixing device 1B according to a second embodiment for generating a mixed fluid will be described. Here, the additive solution means, for example, various cleaning solutions selected for each application.

The fluid mixing device 1B includes a main body member 10, an input port member 20, and a fluid passage forming member 30, as shown in FIGS.

The main body member 10 is a cylindrical member, and has a member mounting portion 11 and a fluid mixing unit on the main body center axis CL along the flow direction of water and air (the flow direction from the left side to the right side in FIG. 17). It has a portion 12 , a diffuser portion 13 and a straight tube portion 14 .

The fluid mixing section 12 has a reduced tapered inner surface 12a as in the first embodiment. The diffuser section 13 is arranged downstream and adjacent to the fluid mixing section 12 and has an enlarged tapered inner surface 13a.

A third input port 16 and a radial flow path 17 are provided at the boundary between the fluid mixing section 12 and the diffuser section 13 to radially introduce the additive liquid from the outside. One end of the radial channel 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 suction pipe 18 is connected to the third input port 16 . Since other configurations are the same as those of the fluid mixing device 1A of the first embodiment, detailed description thereof will be omitted.

Next, the action of generating a three-mixed fluid by mixing an additive liquid with a gas-liquid mixed-phase fluid in which air is mixed with water to generate a three-mixed fluid will be described.

First, in the fluid mixing section 12 having the reduced tapered inner surface 12a, the water caused by the composite swirling flow passes from the inlet side to the outlet side while increasing in speed. Therefore, as described in the first embodiment, a secondary negative pressure generating region 200 (see FIG. 14) is formed in the boundary peripheral region between the fluid mixing portion 12 and the diffuser portion 13 . Therefore, focusing on the secondary negative pressure generating region 200, a hole (the third input port 16 and the radial flow path 17) perpendicular to the main body central axis CL is opened toward the secondary negative pressure generating region 200, and the additive liquid is supplied. A fluid mixing device 1B according to the second embodiment is provided with a suction flow path.

Therefore, the additive liquid sucked by negative pressure through the additive liquid suction pipe 18, the third input port 16, and the radial flow path 17 is introduced in the direction perpendicular to the water by the composite swirling flow. Become. Therefore, the additive liquid is mixed with the water while the water is torn apart in the direction of shear by the composite swirling flow. At this time, since the water is swirling, the mixing and stirring effect of the additive liquid is increased, and a three-kind mixed fluid is generated by mixing the additive liquid with the gas-liquid multiphase fluid M in which air is mixed with water. The gas-liquid mixed-phase fluid generating action of mixing water and air to generate the gas-liquid mixed-phase fluid M is the same as that of the fluid mixing apparatus 1A of the first embodiment, and thus description thereof is omitted.

As described above, in the fluid mixing device 1B of the second embodiment, the following effects are obtained in addition to the effects of the first embodiment.

(8) The fluid mixing portion 12 has a reduced tapered inner surface 12a that is gradually reduced from the inflow side inner diameter Din into which the fluid from the fluid path forming member 30 flows to the outflow side inner diameter Dout. The body member 10 has a diffuser section 13 at a downstream position adjacent to the fluid mixing section 12 . At a boundary position between the fluid mixing section 12 and the diffuser section 13, a third input port 16 and a radial flow path 17 are provided for radially introducing a third fluid (additive liquid agent) from the outside. That is, the fluid mixing section 12 having the reduced tapered inner surface 12a generates a secondary negative pressure on 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 direction perpendicular to the main body central axis CL with respect to the secondary negative pressure generating region 200, the third fluid (addition liquid) is drawn in by the secondary negative pressure. Forced and introduced perpendicularly to the first fluid (water) by combined swirling flow. Therefore, by simply adding a simple flow path configuration using the generation of the secondary negative pressure, the mixed fluid obtained by mixing the first fluid (water) with the second fluid (air) can be further added to the third fluid (additive liquid agent). ) can be mixed to generate a three-mixed fluid.

Although the fluid mixing apparatus of the present invention has been described above based on the first and second embodiments, the specific configuration is not limited to these embodiments. Design changes and additions are permitted as long as they do not deviate from the gist of the invention according to each claim.

In Examples 1 and 2, as the spiral nozzle holes 31, six holes are arranged in a tapered conical shape. However, the number of spiral nozzle holes is not limited to six. For example, three or more holes may be arranged in a tapered conical shape.

In Examples 1 and 2, the nozzle hole is a biaxially inclined hole, and a spiral nozzle hole 31 having an inner surface projection 31c spirally protruding from the inner surface of the nozzle hole is used, and individual swirl flows are added to the overall swirl flow to create a composite A preferable example of swirling flow is shown. However, the nozzle hole may be a biaxially inclined nozzle hole having no inner surface projections, and an example in which the biaxially inclined nozzle hole creates an overall swirling flow may be used. In addition, in the case where the inner surface of the nozzle hole has spirally protruding inner surface protrusions, the example of having three inner surface protrusions was shown in Example 1, but the number is not limited to three, and at least one or more inner surface protrusions are provided. Anything having projections is acceptable. In the first embodiment, the cross-sectional shape of the inner protrusions is mountain-shaped.

In Examples 1 and 2, when the spiral nozzle hole 31 is formed by two-axis inclination, the first tilt angle θ1 in the axial direction and the second tilt angle θ2 in the circumferential direction are set to the same tilt angle of 15°. I gave an example. However, when forming a spiral nozzle hole by two-axis inclination, setting is not limited to the same inclination angle, and the first inclination angle θ1 in the axial direction and the second inclination angle θ2 in the circumferential direction are set to different angles. Of course it's fine.

In Examples 1 and 2, when the spiral nozzle hole 31 is formed by the biaxial inclination, the tip surface 36a of the first outlet 31b for the first fluid is an inclined surface perpendicular to the hole central axis HC, and the first outlet An example in which the opening shape of the spiral nozzle hole 31 at 31b is a perfect circle is shown. However, when forming a spiral nozzle hole with a two-axis inclination, if the first fluid is selected so that the turbulence of the streamline ejected from the first outlet is not a problem, it should be ejected from the elliptical outlet. can be

In Examples 1 and 2, the straight hole 32 formed in the fluid passage forming member 30 has the buffer hole 37 having an inner diameter larger than the hole inner diameter at the position of the second outflow port 32b. However, if a fluid with a high viscosity is selected as the second fluid, the fluid path forming member may not have a buffer hole. Further, in the case of an example having a buffer hole, an example in which the inner diameter and length of the hole are different from those in the first embodiment may be used.

In Examples 1 and 2, the fluid mixing portion 12 has the reduced tapered inner surface 12a over the entire axial length 300, and the outflow side inner diameter Dout is set smaller than the inflow side inner diameter Din. However, the fluid mixing portion may have a reduced tapered inner surface at least part of its axial length. For example, an example may be adopted in which the reduced tapered inner surface is used from the start position to the intermediate position, and the same diameter inner surface is used thereafter. Further, it is also possible to adopt an example in which the inner surface has the same diameter from the start position to the intermediate position of the total length in the axial direction, and the tapered inner surface is reduced thereafter. Further, of the total length in the axial direction, the front and rear regions may have the same diameter inner surface, and the intermediate region may have the reduced tapered inner surface.

Examples 1 and 2 show an example in which the diffuser section 13 having the enlarged tapered inner surface 13 a is arranged at the downstream position adjacent to the fluid mixing section 12 . However, an example may be adopted in which a straight pipe portion whose inner diameter increases suddenly from the inner diameter on the outflow side of the fluid mixing portion is arranged at the downstream position adjacent to the fluid mixing portion.

In Example 2, the first fluid is water, the second fluid is air, and the third fluid is additive liquid agent, and the additive liquid agent is mixed with water and air to form a three-mixed fluid. I showed an example that generates . However, the first fluid and the second fluid are not limited to the combination of water and air as described above. Also, the third fluid is not limited to the additive agent (liquid), and may be another liquid or gas.

1A fluid mixing device 10 main body member 11 member mounting portion 12 fluid mixing portion 12a reduced tapered inner surface 13 diffuser portion 13a enlarged tapered inner surface 20 input port member 21 first input port 22 second input port 30 fluid passage forming member 31 spiral nozzle hole ( nozzle hole)
31a First inlet 31b First outlet 31c Inner projection 32 Straight hole 32a Second inlet 32b Second outlet 36a Tip surface 37 Buffer hole 1B Fluid mixing device 16 Third input port 17 Radial flow channel CL Body central axis HC Hole center axis W Water (first fluid)
A air (second fluid)
M gas-liquid multiphase fluid (mixed fluid)
S1 First section S2 Second section Din Inflow side inner diameter Dout of fluid mixing section 12 Outflow side inner diameter of fluid mixing section 12

Claims (8)

A fluid mixing device for mixing a plurality of fluids,
a body member having a member attachment portion and a fluid mixing portion on the center axis of the body along the direction of flow of the plurality of fluids;
an input port member fixed to the member mounting portion and having a first input port for guiding a first fluid from the outside and a second input port for guiding a second fluid different from the first fluid from the outside;
A fluid having a nozzle hole fixed at a downstream position of the input port member, into which the first fluid from the first input port flows, and a straight hole into which the second fluid from the second input port flows. a path forming member,
The nozzle hole has a plurality of holes arranged in a tapered conical shape, and the first inlet and the first outlet for the first fluid are arranged in the radial direction and the circumferential direction with respect to the main body central axis. It is formed by connecting with a two-axis inclined hole inclined to
the straight hole is formed by connecting a second inlet and a second outlet for the second fluid by means of a central hole having a central axis of the hole aligned with the central axis of the main body;
The fluid path forming member has a plurality of first outlets opened on a circumference and a second outlet opened in a central portion surrounded by the plurality of first outlets. A fluid mixing device, wherein the tip surface is disposed in a fluid inlet region of the fluid mixing section. A fluid mixing device according to claim 1, wherein
The nozzle hole is a spiral nozzle hole having an inner surface protrusion that spirally protrudes from the first inlet of the first fluid toward the second outlet on the inner surface of the nozzle hole that is biaxially inclined. and a fluid mixing device. In the fluid mixing device according to claim 2,
The spiral nozzle hole has a section from the first inlet to the first outlet for the first fluid, a first section from the first inlet to an intermediate position, and a section from the intermediate position to the first flow. Divided into a second section to the exit,
The first section is an inner surface projection section having the inner surface projection on the inner surface of the nozzle hole, the second section is an equal diameter hole section in which an equal diameter hole is formed, and the tip surface of the first outlet is: A fluid mixing device characterized by having an inclined surface orthogonal to the center axis of the hole. In the fluid mixing device according to any one of claims 1 to 3,
The fluid mixing device, wherein the fluid path forming member has a buffer hole having an inner diameter larger than that of the straight hole at the position of the second outlet. In the fluid mixing device according to any one of claims 1 to 4,
A fluid mixing device, wherein the fluid mixing section has a tapered inner surface that is gradually reduced from an inner diameter on the inflow side into which the fluid flows from the fluid passage forming member to an inner diameter on the outflow side. In the fluid mixing device according to claim 5,
The fluid mixing device is characterized in that the minimum inner diameter of the outflow side inner diameter of the fluid mixing section is set to an inner diameter with which a total cross-sectional area of at least a plurality of the first outflow ports can be obtained. In the fluid mixing device according to any one of claims 1 to 6,
the body member has a diffuser portion at a downstream position adjacent to the fluid mixing portion;
A fluid mixing device, wherein the diffuser section has an enlarged tapered inner surface in which an inner diameter of the diffuser inflow side into which the mixed fluid flows from the fluid mixing section is increased toward the outflow side of the mixed fluid. In the fluid mixing device according to any one of claims 1 to 7,
The fluid mixing portion has a tapered inner surface that is gradually reduced from an inner diameter on the inflow side into which the fluid flows from the fluid passage forming member to an inner diameter on the outflow side,
the body member has a diffuser portion at a downstream position adjacent to the fluid mixing portion;
A fluid mixing device, comprising a third input port and a radial flow path for radially introducing a third fluid from the outside at a boundary position between the fluid mixing section and the diffuser section.

Images