JP2019214003A - Mixer and fluid mixing system - Google Patents

Abstract

To provide a mixer and a fluid mixing system capable of efficiently mixing different fluids to one another.SOLUTION: In a mixer 2, a mixed liquid where a gas and a liquid are mixed is supplied and the mixing of the gas and the liquid in the mixed liquid is facilitated. The mixer 2 has a casing 11 having an inflow port 19 from which the mixed liquid enters and an outflow port 20 from which the mixed liquid flows out. The casing 11 is provided with a rotatable shaft 12. The casing 11 is also provided with a rotor 13 which is fixed to the shaft 12 and rotatable together with the shaft. Further, a stator 14 fixed and mounted on the casing 11. In addition, a passing section 29 is configured by a gap between the rotor 13 and the stator 14, which communicates the inflow port 19 and the outflow port 20 so as to allow the mixed liquid entered from the inflow port 19 to flow to the outflow port 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a mixing device that mixes different fluids, and a fluid mixing system.

  As a fluid mixing system for mixing a liquid and a gas to dissolve the gas in the liquid, for example, a gas-liquid mixing / dissolving device 41 having a configuration shown in FIG. 3 is known.

  In the gas-liquid mixing and dissolving device 41, for example, a gas is mixed into the liquid by the vortex pump 3 as a mixture supply means, and the mixed liquid as the gas-liquid mixture is supplied to the dissolution tank 43. Is supplied to the separation tank.

  That is, the mixed liquid from the vortex pump 3 is supplied from the upper part of the dissolving tank 43 and is ejected in the dissolving tank 43 to further turbulently agitate the mixed liquid to dissolve the gas in the liquid (mixed liquid). Increase.

  On the other hand, by supplying the mixed liquid drawn from the lower part of the dissolving tank 43 to the separation tank 44, the gas not dissolved in the mixed liquid is discharged from the vent valve 45 on the upper part of the separation tank 44, and the gas is discharged. The dissolved mixture is discharged through the pressure regulating valve 46. The mixed liquid that has been discharged into the dissolving tank 43 and has an increased amount of dissolved gas is in a pressurized state, and when it is discharged from the separation tank 44, the pressure is rapidly reduced to the atmospheric pressure by the vent valve 45. As a result, the gas dissolved in the liquid is generated as fine bubbles.

  In addition, as a miniaturized gas-liquid mixing and dissolving apparatus having the above configuration, for example, as shown in Patent Document 1, a cyclone type separation tank for centrifuging and discharging undissolved gas is integrated below the dissolution tank. Is known.

JP 2002-273183 A

  However, in the configuration of FIG. 3 and Patent Document 1 described above, it is necessary to increase the dissolution of the gas in the dissolving tank and to separate the undissolved gas in the separation tank, making it difficult to reduce the size of the equipment. .

  Therefore, there has been a demand for a technology that can efficiently mix different fluids even if the size is reduced.

  The present invention has been made in view of such a point, and an object of the present invention is to provide a mixing apparatus and a fluid mixing system that can efficiently mix different fluids.

  The mixing device according to claim 1, wherein a mixture in which different fluids are mixed is supplied to promote mixing of the fluids in the mixture, and an inflow port through which the mixture flows and A casing having an outlet from which the mixture flows, a shaft rotatably provided with respect to the casing, a rotor fixed to the shaft and rotatable with the shaft, and fixedly attached to the casing. And a gap between the rotor and the stator constitutes a passage portion through which the mixture flowing from the inflow port passes to the outflow port, and when the mixture passes through the passage portion, The rotor is rotatable.

  According to a second aspect of the present invention, in the mixing apparatus according to the first aspect, the passage portion is provided with a plurality of grooves in at least one of the stator and the rotor.

  According to a third aspect of the present invention, in the mixing apparatus according to the first or second aspect, the width of the passage portion gradually changes toward the downstream side.

  According to a fourth aspect of the present invention, there is provided the mixing apparatus according to any one of the first to third aspects, wherein a mixed liquid that is a mixture of a gas and a liquid is supplied to mix the gas into the mixed liquid. A mixing device for accelerating dissolution, comprising an atmosphere opening means for opening the mixture from an outlet to the atmosphere.

  A fluid mixing system according to a fifth aspect includes the mixing device according to any one of the first to fourth aspects, and a mixture supply unit that supplies a mixture in which fluids are mixed to the mixing device. The mixture supplying means pressurizes and supplies the mixture to the inlet of the mixing device.

  According to the present invention, the passage between the mixture from the inlet and the outlet is formed by the gap between the rotor and the stator, so that the gas can be efficiently dissolved in the liquid.

It is a schematic diagram showing the composition of the fluid mixing system concerning one embodiment of the present invention. It is sectional drawing which shows the passage part of the mixing apparatus in a fluid mixing system same as the above. It is the schematic which shows the structure of the conventional fluid mixing system.

  Hereinafter, a configuration of an embodiment of the present invention will be described in detail with reference to the drawings.

  In FIG. 1, reference numeral 1 denotes a gas-liquid mixing / dissolving apparatus as a fluid mixing system. This gas-liquid mixing / dissolving apparatus 1 is configured such that a predetermined liquid such as water as one fluid is mixed with air, oxygen or ozone as another fluid. For mixing and dissolving a predetermined gas. That is, the gas-liquid mixing and dissolving device 1 is used as, for example, a microbubble generating device that generates microbubbles or the like, an oxygen enriching device, an ozone dissolving device, or the like.

  The gas-liquid mixing and dissolving device 1 includes a mixing device 2 and a vortex pump 3 as a mixture supply means disposed upstream of the mixing device 2. The vortex pump 3 mixes a gas and a liquid. The liquid is supplied to the mixing device 2 under pressure, and the mixing and dissolving of the gas into the mixed solution in the mixing device 2 are promoted.

  The vortex pump 3 is connected to a pipe 6 to which liquid is supplied via a suction-side pressure gauge 4 and a suction-side pressure regulating valve 5, and is connected to gas suction means 7 for sucking a gas such as air. I have. In addition. The gas suction means 7 has a gas suction pipe 8b connected to a suction nozzle 8a inserted into a liquid suction port of the vortex pump 3. The gas suction pipe 8b is a vertically provided pipe having an open upper end, for example, when sucking air as a gas.

  The vortex pump 3 and the mixing device 2 are connected by a pipe 9, and the mixed liquid discharged from the vortex pump 3 is supplied to the gas-liquid mixing and dissolving apparatus 1 through the pipe 9 under pressure.

  As shown in FIG. 2, the mixing device 2 includes a casing 11, a shaft 12 rotatably provided with respect to the casing 11, a rotor 13 fixed to the shaft 12 and rotatable with the shaft 12, And a stator 14 fixedly attached to 11.

  The casing 11 has a hollow cylindrical portion 15, a lid portion 16 fixedly provided on one axial side of the cylindrical portion 15, and a base portion fixedly provided on the other axial side of the cylindrical portion 15. 17 and has.

  The cover 16 is fixed to the cylindrical portion 15 near the circumferential end by bolts 18a and nuts 18b. An inflow port 19 is provided substantially at the center of the lid 16, and the pipe 9 is connected to the inflow port 19 so that the mixture from the vortex pump 3 flows into the casing 11 through the inflow port 19. I do.

  At a part of the side surface of the cylindrical portion 15, an outlet 20 from which the mixed liquid flowing from the inlet 19 flows out is provided.

  The base portion 17 is fixed to the cylindrical portion 15 by bolts 21 in the vicinity of the end in the circumferential direction, and the shaft 12 is rotatably mounted via, for example, a bearing (not shown).

  Further, a pipe 23 is connected to the outlet 20 of the casing 11, and a pressure gauge 24 and a pressure regulating valve 25 as air release means are provided in the pipe 23. The pipe 23 is connected to the bottom of a predetermined processing tank or the like (not shown), and the mixed solution from the mixing device 2 is discharged to the predetermined processing tank or the like through the pipe 23.

  The rotor 13 is fixed to the shaft 12 by bolts 26a and nuts 26b. When the shaft 12 rotates with respect to the casing 11, the rotor 13 rotates with the shaft 12.

  The outer peripheral surface of the rotor 13 has a tapered shape whose diameter gradually decreases toward one side in the axial direction of the casing 11 (toward the inlet 19 of the casing 11).

  The stator 14 is fixed to the lid 16 with bolts 27 and provided. Further, the stator 14 is provided in the casing 11 with an interval in the axial direction of the casing 11 with respect to the base 17, and a fluid that communicates with the outlet 20 through a space between the stator 14 and the base 17. Flow path 28 is configured.

  Further, the inner peripheral surface of the stator 14 has a tapered shape whose diameter gradually decreases toward one axial side of the casing 11 (toward the inlet 19 of the casing 11). Note that the gradually reduced inner diameter of the stator 14 is slightly larger than the outer diameter of the rotor 13, and the taper inclination angle of the stator 14 is slightly smaller than the taper inclination angle of the rotor 13.

  The rotor 13 and the stator 14 are housed inside the stator 14 so that the rotor 13 is inserted therein, and are installed in the casing 11.For example, by transmitting torque from a driving device such as a motor (not shown), The rotor 13 rotates with the shaft 12 with respect to the casing 11 and the stator 14.

  Here, in the casing 11, a passage between the outer peripheral surface of the rotor 13 and the inner peripheral surface of the stator 14, that is, a so-called gap, forms a passage portion 29 through which the mixed liquid can pass. That is, the inflow port 19 and the outflow port 20 communicate with each other through the passage section 29 and the flow path 28, and the mixed liquid flowing in from the inflow port 19 passes through the passage section 29, and is rotated by the rotation of the impeller 30. After passing through the flow path 28, it flows out of the outlet 20 in a pressurized state.

  In addition, since the outer peripheral surface of the rotor 13 and the inner peripheral surface of the stator 14 are tapered, the passage portion 29 is disposed inclined with respect to the axial direction of the casing 11 such that the downstream side is located outside the upstream side. ing. In the case where the passage section 29 is inclined as described above, the inclination angle can be appropriately changed.

  Further, since the inner diameter of the stator 14 is slightly larger than the outer diameter of the rotor 13 and the inclination angle of the taper of the stator 14 is slightly smaller than the inclination angle of the taper of the rotor 13, the clearance of the passage portion 29 is directed to the downstream side. Is gradually narrowing.

  The passage portion 29 is provided with a plurality of fine grooves (not shown) formed along the circumferential direction on at least one of the outer peripheral surface of the rotor 13 and the inner peripheral surface of the stator 14, and irregularities are formed on the surface. A preferred configuration is preferred.

  Next, the operation and effect of the embodiment will be described.

  First, the liquid is sucked into the vortex pump 3. At this time, while observing the suction side pressure gauge 4, the suction pressure adjusting valve 5 is throttled, the liquid suction port of the vortex pump 3 is set to a negative pressure, and gas such as air is simultaneously discharged from the gas suction pipe 8b through the suction nozzle 8a. Suction.

  Inside the vortex pump 3, the gas and the liquid are stirred and mixed, and the mixed liquid is supplied under pressure from the vortex pump 3 to the inlet 19 of the mixing device 2 through the pipe 9.

  In the mixing device 2, the mixed liquid flowing from the inlet 19 is pushed by the pressurized supply from the vortex pump 3 and flows so as to spread outward between the rotor 13 and the lid 16. It passes through a passage section 29 formed by a gap between the rotor 13 and the stator 14.

  Here, the rotor 13 is rotatable with respect to the stator 14, and when the mixed liquid passes through the passage section 29 with the rotor 13 rotated, the mixed liquid passing through the passage section 29 in a pressurized state is A shear force due to the rotation of the rotor 13 is applied, and the gas and the liquid in the mixed liquid are mixed so as to be finely sheared, and the dissolution of the gas in the mixed liquid is promoted. That is, the contact area between the liquid (mixture) under pressure and the undissolved gas increases due to an increase in the shearing force on the mixture, and the dissolution of the gas is promoted further than the gas-liquid dissolution equilibrium state. The amount of gas dissolved therein increases, and the gas is efficiently dissolved in the liquid to a high concentration.

  The mixed liquid in which the mixing and dissolution of the liquid and the gas are promoted through the passage portion 29 flows out of the outlet 20 through the flow path 28.

  Here, the mixed liquid supplied under pressure from the vortex pump 3 is always in a pressurized state even in the mixing device 2, but flows out from the outlet 20 to the bottom of a predetermined processing tank via the pipe 23. At this time, the gas is released after being reduced to almost the atmospheric pressure by the pressure regulating valve 25. Note that the mixed liquid depressurized by the pressure adjusting valve 25 and opened to the atmosphere generates fine bubbles so as to foam in a predetermined processing tank or the like.

  According to the gas-liquid mixing and dissolving apparatus 1, since the gap between the rotor 13 and the stator 14 forms the passage portion 29 through which the mixed liquid from the inlet 19 passes to the outlet 20, the mixing is performed. By rotating the rotor 13 to apply a shearing force to the mixed liquid when the liquid passes through the passage section 29, the mixing and dissolution of the gas with the liquid can be promoted. Therefore, for example, the gas can be efficiently dissolved in the mixed solution to a high concentration without installing a dissolution tank or a separation tank as in the related art, and the space of the system is reduced (for example, the foot space area is reduced by about 30%). Can be planned.

  In addition, the mixing device 2 can be installed in the system in an in-line system, and since there is no need to install a dissolution tank or a separation tank as in the related art, the structure of the piping system can be simplified and the cost can be reduced. it can.

  The passage portion 29 is provided with a fine groove on at least one of the inner peripheral surface of the stator 14 and the outer peripheral surface of the rotor 13, so that the number of shears to the mixed liquid passing through the passage portion 29 can be increased, and Mixing and dissolving with gas can be further promoted.

  Alternatively, since the passage portion 29 is located outside the inlet 19, the passage portion 29 is inclined with respect to the axial direction of the casing 11, so that the casing 19 extends from the inlet 19 located substantially at the center in the circumferential direction. The mixed liquid that flows into the inside 11 and spreads outward can smoothly flow into the passage portion 29.

  Further, since the width of the passage portion 29 gradually changes downstream, the shear force can be efficiently applied to the mixed liquid passing therethrough, and the mixing and dissolving action can be improved. In particular, in the case of a microbubble generator that generates microbubbles or the like, by designing the width of the passage portion 29 to be gradually narrowed toward the downstream, it is possible to improve the mixing and dissolving effect on the mixed liquid passing therethrough, and to improve the efficiency. A gas can be dissolved in a liquid.

  Since the pressure adjusting valve 25 for releasing the mixed liquid from the outlet 20 to the atmosphere is provided in the pipeline 23 connected to the outlet 20, the mixed liquid can be discharged so as to foam in a predetermined processing tank. .

  In the above-described embodiment, the gas and the liquid are mixed by the vortex pump 3 and the mixed liquid is supplied to the mixing device 2. However, the present invention is not limited to such a configuration. The pump is not limited to the vortex pump 3 as long as it can supply the liquid, and can be used as appropriate.

  The mixing device 2 is not limited to a configuration in which a gas is dissolved in a mixed liquid that is a mixture of a predetermined liquid and a predetermined gas. A configuration for mixing or a configuration for mixing gases may be employed.

  The passage portion 29 has a configuration in which the width is gradually narrowed toward the downstream side, but is not limited to such a configuration. May be set as appropriate, for example, a configuration in which the width gradually increases toward the downstream side or a configuration in which the width is constant.

DESCRIPTION OF SYMBOLS 1 Gas-liquid mixing / dissolving device as a fluid mixing system 2 Mixing device 3 Vortex pump as a mixture supply means
11 Casing
12 shaft
13 Rotor
14 Stator
19 Inlet
20 Outlet
29 Passage

Claims (5)

A mixing device in which a mixture in which different fluids are mixed is supplied, and mixing of the fluids in the mixture is promoted,
A casing having an inlet through which the mixture flows in and an outlet through which the mixture flows out,
A shaft rotatably provided with respect to the casing,
A rotor fixed to the shaft and rotatable with the shaft;
A stator fixedly attached to the casing,
By the gap between the rotor and the stator, a passing portion for the mixture flowing from the inflow port to pass to the outflow port is configured,
The mixing device, wherein the rotor is rotatable when the mixture passes through the passage section. The mixing device according to claim 1, wherein the passage portion includes a plurality of grooves provided in at least one of the stator and the rotor. The mixing device according to claim 1, wherein the width of the passage portion gradually changes toward the downstream side. A mixed device that is supplied with a mixed liquid that is a mixture of a gas and a liquid, and promotes mixing and dissolution of the gas in the mixed liquid,
The mixing apparatus according to any one of claims 1 to 3, further comprising an atmosphere opening means for opening the mixture from the outlet to the atmosphere. A mixing device according to any one of claims 1 to 4,
A mixture supply means for supplying a mixture in which fluids are mixed to a mixing device,
A fluid mixing system, wherein the mixture supply means pressurizes and supplies the mixture to an inlet of the mixing device.

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