JP2010104870A - Gas dissolving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas dissolving apparatus wherein a corner part changing the flow path direction is connected to the middle of a connection flow path of liquid connecting a pump to a dissolving tank, straightening the fluid flow at the corner part while miniaturizing, suppressing whirling flow, and sufficiently keeping the dissolving efficiency of gas in the dissolving tank. <P>SOLUTION: The corner part 19 changing the flow path direction is connected to the middle of the connection flow path 10 connecting an inflow port 9 of the dissolving tank 2 to the pump 3, a straightening means having a flow path of fluid is disposed at least any one of the corner part or a connection flow path 10b downstream of the corner part. The straightening means suppresses the whirling flow occurring in the flow of the fluid sent from the pump. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a gas dissolving apparatus that can be used to generate bath water in which fine bubbles are generated.

  The present applicant has made various proposals for a gas dissolving apparatus for dissolving a gas into a liquid in a dissolution tank.

  For example, in the gas dissolution apparatus described in Patent Document 1, a cylindrical body corresponding to a dissolution tank is disposed so that a central axis thereof is inclined with respect to the horizontal direction, and an intermediate portion of a side wall portion of the cylindrical body having a substantially cylindrical shape. The part of the cylindrical body is located at the interface between the gas and the liquid stored inside, the part above the interface in the cylindrical body is the gas storage part, and the part below the interface is the liquid storage part. An injection port for injecting the gas-liquid mixed fluid into the gas storage part in the cylindrical body is provided at the same level as the interface of the part or slightly below the interface, and the cylindrical shape is provided near the lower end of the liquid storage part of the cylindrical body. An outflow port through which liquid in the body flows out is provided.

The gas dissolving device can increase the area of the interface between the liquid and the gas stored in the cylindrical body and can increase the depth of the stored liquid, and the cylinder in a state where large bubbles are mixed. It is possible to suppress the outflow from the body. Moreover, space saving of a gas dissolving apparatus is achieved by inclination arrangement | positioning of a cylindrical body.
JP 2007-313464 A

  With regard to such a gas-liquid dissolving apparatus, the applicant of the present application is considering to promote downsizing. For example, as shown in FIGS. 7 and 8, in the connection flow path 103 that connects the tubular body 101 and the pump 102 that supplies the gas-liquid mixed fluid into the tubular body 101, the flow path is shortened. In addition, it is conceivable to connect a corner portion 105 such as an elbow joint 104 that changes the flow direction of the gas-liquid mixed fluid in the middle of the path.

  However, when the corner portion 105 is connected in the middle of the path of the connection flow path 103, the flow of the gas-liquid mixed fluid sent out from the pump 102 tends to become the swirl flow 106 at the elbow joint 104. As shown in FIG. 7, the swirl flow 106 causes a twist 107 in the jet flow that is jetted from the jet port on the downstream side to the gas storage portion in the cylindrical body 101, and shifts from the target jet position 108. The twisted jet flow hardly separates the bubbles, reduces the gas-liquid contact area, and causes poor gas-liquid mixing. As a result, the gas dissolution efficiency in the cylindrical body is reduced.

  The present invention has been made in view of the circumstances as described above, and a corner portion that changes the flow direction is connected in the middle of the connection flow path of the liquid that connects the pump and the dissolution tank, while achieving miniaturization. An object of the present invention is to provide a gas dissolving device that can sufficiently maintain the melting efficiency of a gas in a dissolution tank by rectifying the flow of fluid in a corner portion and suppressing swirling flow.

  The present invention has the following features in order to solve the above problems.

  According to a first aspect of the present invention, there is provided a dissolution tank provided with an inlet for introducing fluid into the inside from the bottom side, an outlet for taking out a dissolved liquid from the bottom, and a pump for supplying fluid into the dissolution tank. The gas that is ejected from the inlet and flows into the dissolution tank is mixed with the gas stored in the dissolution tank or the gas supplied from the inlet together with the fluid, dissolved, and the liquid in which the gas is dissolved flows. In the gas dissolving device that is taken out of the dissolution tank from the outlet, a corner portion that changes the direction of the flow path is connected in the middle of the fluid connection flow path that connects the inlet and the pump. At least one of the downstream connection flow paths is provided with a rectifying means having a fluid flow path, and the rectifying means suppresses the swirling flow generated in the flow of the fluid sent out from the pump. It is characterized in that.

  The second invention is characterized in that, in the feature of the first invention, the cross-sectional shape inside the flow passage provided in the rectifying means is a polygon from a triangle to an octagon.

  The third invention is characterized in that, in the feature of the first invention, a rib projecting inward is disposed inside a flow passage provided in the rectifying means.

  According to a fourth aspect of the present invention, in the feature of the first aspect of the invention, the central axis of the vertical portion rising vertically downstream of the elbow joint deviates from the central axis of the flow channel upstream of the elbow joint, and the upstream flow In the fluid flowing through the path, elbow joints are arranged at the corners so that a portion having a high flow velocity substantially coincides with the central axis of the vertical part, and rectification means is formed.

  According to the first aspect of the present invention, the flow of the fluid can be rectified by the rectifying means at the corner portion and the swirling flow can be suppressed while reducing the size, and the gas dissolution efficiency in the dissolution tank can be sufficiently maintained. it can.

  According to the second aspect of the invention, in the effect of the first aspect of the invention, the cross-sectional shape from the inner triangle to the octagon in the flow passage provided in the rectifying means can impart resistance to the swirling flow in the swirling direction. The swirling flow can be attenuated and suppressed.

  According to the third aspect of the invention, in the effect of the first aspect of the invention, the rib can be given resistance to the swirling flow in the swirling direction, and the swirling flow can be attenuated and suppressed.

  According to the fourth aspect of the invention, in the effect of the first aspect of the invention, the distribution of the flow of the fluid flowing into the elbow joint can be distributed toward the central axis of the vertical portion of the elbow joint, Generation of the swirling flow itself can be suppressed.

  FIG. 1 is a perspective view showing a first embodiment of the gas dissolving apparatus of the present invention. FIG. 2 is a schematic configuration diagram of the gas dissolving apparatus shown in FIG. FIG. 3 is a schematic plan view showing the periphery of the pump of the gas dissolving apparatus shown in FIG.

  The gas dissolving device 1 includes a dissolving tank 2 and a pump 3.

  The dissolution tank 2 having a cylindrical shape is formed of a peripheral wall portion 4 that is curved, and planar side wall portions 5 that are disposed at both left and right ends of the peripheral wall portion 4. The left and right ends of the peripheral wall portion 4 are closed by the side wall portion 5. In addition, the dissolution tank 2 is arranged such that the longitudinal central axis 6 that coincides with the central axis of the peripheral wall portion 4 is inclined with respect to the horizontal direction 7 at an angle of, for example, 10 to 45 °.

  In such a dissolution tank 2, an inflow port 9 is formed in the bottom wall portion of the higher portion 8, which is higher than the central portion, and an inflow channel 10 is connected to the inflow port 9. An outlet 12 is formed in the bottom wall portion of the lower portion 11, which is lower than the center portion of the dissolution tank 2. The outflow channel 13 is connected to the outflow port 12, and the outflow channel 13 is connected to the liquid outlet 14 at the end. The liquid lead-out part 14 is connected to a liquid supply part 15 such as a bathtub through a connection channel.

  The pump 3 is connected to the dissolution tank 2 via an inflow channel 10 as a connection channel. A centrifugal pump is employed as the pump 3, and as shown in FIG. 3, one end portion of the inflow channel 10 extending from the pump 3 is connected in a tangential direction to a substantially circular shape that is a cross section of the centrifugal pump. . In addition, a gas introduction unit 16 is connected to the pump 3.

  In such a gas dissolving device 1, when the operation is started, a gas such as air is introduced into the pump 3 from the gas introduction unit 16 by the operation of the pump 3, and mixed with a liquid serving as a solvent such as water. The mixed fluid is supplied into the dissolution tank 2 through the inflow channel 10. When the gas introduction part 16 is not connected to the pump 3, the liquid is supplied alone into the dissolution tank 2. A fluid such as a gas-liquid mixed fluid or a liquid alone is jetted toward the inner surface of the upper wall portion of the dissolution tank 2 and flows into the dissolution tank 2. A gas to be mixed with the fluid is previously pressurized and stored in the dissolution tank 2, or gas is supplied into the dissolution tank 2 through the inlet 9 together with the fluid. When supplying the gas-liquid mixed fluid into the dissolution tank 2, the same type of gas as the gas mixed with the liquid is selected as the gas introduced into the dissolution tank 2. The fluid flowing into the dissolution tank 2 collides with the inner surface of the upper wall of the dissolution tank 2, rebounds, and gradually accumulates at the bottom of the dissolution tank 2. Further, the fluid that collides with the inner surface of the upper wall portion of the dissolution tank 2 and rebounds collides with the liquid surface 18 of the liquid 17 stored in the dissolution tank 2 and stirs the liquid 17.

  The gas in the dissolution tank 2 and the liquid 17 are mixed by stirring at this time, and the dissolution of the gas in the liquid 17 is promoted. This is because the gas mixed as bubbles in the liquid 17 is subdivided by shearing by stirring, the surface area in contact with the liquid 17 is increased, and the dissolved concentration of the gas near the liquid surface 18 is made uniform by stirring. This is because the rate of dissolution of the gas into the liquid 17 is increased. The liquid 17 in which the gas is dissolved in this way flows out to the outflow channel 13 through the outlet 12, is taken out of the dissolution tank 2, and is sent out to the predetermined liquid supply unit 15 by the liquid outlet 14.

  Many bubbles of undissolved gas are mixed in the liquid 17 stored in the dissolution tank 2. The bubbles are present densely toward the upper side of the liquid 17 stored in the dissolution tank 2, and large bubbles exist near the liquid surface 18. On the other hand, there is not much in the vicinity of the bottom of the dissolution tank 2. Since the outlet 12 is formed at the bottom of the dissolution tank 2, the liquid 17 is taken out from the lower side where there are almost no large bubbles. Further, since the dissolution tank 2 is arranged with the central axis 6 in the longitudinal direction inclined with respect to the horizontal direction 7, the area of the liquid surface 18 corresponding to the interface between the gas and the liquid 17 is reduced to the dissolution tank 2. Compared with the horizontal arrangement, the size can be increased, and the efficiency of mixing and stirring the gas and the liquid 17 is increased. In addition, the depth of the liquid 17 below the liquid surface 18 is relatively deep, and the outflow of bubbles is more effectively suppressed.

  Further, the gas dissolving device 1 is designed to save space because the dissolving tank 2 is inclined as described above.

  In the gas dissolving device 1, in order to promote downsizing, the flow direction is changed in the middle of the inflow channel 10 as a fluid connection channel that connects the inlet 9 of the dissolution tank 2 and the pump 3. A corner portion 19 is connected. The corner portion 19 forms a fluid flow path, and includes a horizontal portion 20 that is disposed substantially horizontally and a vertical portion 21 that rises perpendicular to the horizontal portion 20. The horizontal portion 20 and the vertical portion 21 communicate with each other, the horizontal portion 20 is connected to the horizontal portion 10a of the inflow channel 10 extending in the substantially horizontal direction from the pump 3, and the vertical portion 21 is connected to the inlet 9 of the dissolution tank 2. And is connected to the vertical portion 10b of the inflow channel 10 disposed in a substantially vertical direction with respect to the horizontal portion 10a. Such a corner portion 19 can be realized by, for example, an elbow joint 22 or the like.

  Further, in the gas dissolving apparatus 1, as shown in FIG. 3, the corner 19 or the inflow channel 10 on the downstream side of the corner part 19, specifically, the downstream side of the corner part 19, is connected. A rectifying means 23 having a fluid flow path is disposed in at least one of the vertical portions 10b forming a part of the flow path. Specifically, the rectifying means 23 can also serve as the vertical portion 21 of the corner portion 19, or can also serve as the inflow channel 10 on the downstream side of the corner portion 19, that is, the vertical portion 10 b. Furthermore, when the vertical portion 21 of the corner portion 19 is also used, a vertical portion that rises vertically on the elbow joint 22 can also be used.

  The rectifying means 23 shown in FIG. 3 has a rectangular cross section inside the flow passage 24 provided.

  The flow velocity of the fluid discharged from the pump 3 is generally distributed in the width direction of the inflow channel 10. In the horizontal portion 10a, the outer flow velocity is fast and the inner flow velocity is slow. When the fluid flows into the corner portion 19 with such a flow velocity distribution 25 and the flow path direction changes, a swirl flow 26 is generated in the fluid.

  Therefore, in the rectifying means 23, the cross-sectional shape inside the flow passage 24 is a quadrangle, and a fluid is circulated through the quadrangular flow passage 24 to provide resistance to the swirl direction, thereby attenuating and suppressing the swirl flow 26. . If the cross-sectional shape inside the flow passage 24 provided in the rectifying means 23 is a polygon more than a triangle, resistance can be given to the swirl direction, but the attenuation and suppression effect of the swirl flow 26 has a small number of angles. It is so expensive. If it is less than an octagon, the swirling flow 26 is sufficiently attenuated and suppressed.

  In the rectifying means 23, the cross-sectional area inside the flow passage 24 is suppressed in order to suppress a reduction in the cross-sectional area due to the cross-sectional shape inside the flow passage 24 being a polygon from the triangle to the octagon as described above. Can be made equivalent to the cross-sectional area in the case of a circular shape which is a general inner shape of the inflow channel 10. A decrease in the cross-sectional area is suppressed, and a decrease in the flow rate of the fluid due to the arrangement of the rectifying means 23 is suppressed.

  As described above, the gas dissolving device 1 can rectify the flow of the fluid by the rectifying means 23 in the corner portion 19 and reduce the swirling flow while reducing the size, and the jet flow as shown in FIG. The twist 107 which arises can be suppressed. For this reason, in the gas dissolving apparatus 1, the fluid can be ejected to the target ejection position in the dissolution tank 2, the gas-liquid mixing is sufficiently performed, and the gas dissolution efficiency in the dissolution tank 2 can be sufficiently maintained. it can.

  In addition, about the rectification | straightening means 23 arrange | positioned at the gas dissolving apparatus 1, the length of the flow path 24 etc. are suitably set according to inner side cross-sectional shape so that the attenuation | damping and suppression effect of the swirl flow 26 may fully be exhibited. Can be set.

  FIG. 4 is a schematic plan view of a main part showing a second embodiment of the gas dissolving apparatus of the present invention, and corresponds to FIG. 3 shown for the first embodiment.

  The rectifying means 27 shown in FIG. 4 has four ribs 29 protruding inwardly inside the flow passage 28 provided. The four ribs 29 are made into a set of two, and are arranged in the diametrical direction of the flow passage 28 whose inner cross section has a substantially circular shape. By such ribs 29, the rectifying means 27 imparts resistance to the swirling direction of the swirling flow 26 and attenuates and suppresses the swirling flow 26. In the rectifying means 27, in order to suppress a reduction in the cross-sectional area of the flow passage 28 due to the arrangement of the ribs 29, a reduction in the cross-sectional area of the flow passage 28 is suppressed by reducing the thickness of the ribs 29. A decrease in the flow rate of the fluid due to the arrangement can be suppressed.

  The gas dissolving apparatus 1 provided with the rectifying means 27 shown in FIG. 4 is also similar to the gas dissolving apparatus 1 provided with the rectifying means 23 shown in FIG. The flow of the fluid can be rectified by the rectifying means 27 and the swirling flow can be suppressed. The torsion 107 generated in the jet flow as shown in FIG. 7 can be suppressed, and the gas dissolution apparatus 1 can sufficiently maintain the gas dissolution efficiency in the dissolution tank 2.

  In addition, about the rectification | straightening means 23, the number of ribs 29 in the length direction of the flow path 28, length, etc. can be set suitably so that the attenuation | damping and suppression effect of the swirling flow 26 may fully be exhibited. The four ribs 29 do not necessarily have to be arranged at the same position, and the positions of the ribs 29 may be different in the length direction of the flow passage 28 in each group, or may be arranged at positions different from all four. It is.

  Furthermore, the longer the protrusion length of the rib 29 protruding inwardly in the flow passage 28, the higher the attenuation and suppression effect of the swirl flow 26. For this reason, for example, as shown in FIG. 5 <a>, the four ribs 29a are arranged so as to extend in the substantially circular chord direction of the cross section of the flow passage 28 toward the adjacent ribs 29a. With such an arrangement, the protruding length of each rib 29a is longer than that of the rib 29 shown in FIG. 4, and the effect of damping and suppressing the swirling flow 26 is enhanced.

  Further, as shown in FIG. 5 <b>, the two ribs 29b are diametrically installed inside the flow passage 28 having a substantially circular cross section, and intersect each other at 90 °. The protruding length of the rib 29b is further increased. In this case, one rib 29b extends integrally in the diametrical direction inside the flow passage 28, and the other rib 29b is divided or integrated so as to be fitted or contacted with one rib 29b. In the case of extending in the diametrical direction inside the flow passage 28, they can be arranged at different positions.

  Furthermore, as shown in FIG. 5 <c>, the rib 29c is constructed as a single piece and is installed in the diametrical direction inside the flow passage 28 having a substantially circular cross section. Since the rib 29c is longer than the individual protruding lengths of the rib 29 shown in FIG. 4 and the rib 29a shown in FIG. 5 <a>, the effect of damping and suppressing the swirling flow 26 is enhanced.

  The number, length, and the like of the ribs 29a, 29b, and 29c can be appropriately set in the length direction of the flow passage 28.

  FIG. 6 is a schematic plan view of a main part showing a third embodiment of the gas dissolving apparatus of the present invention, and corresponds to FIG. 3 shown for the first embodiment.

  In the rectifying means 30 shown in FIG. 6, the elbow joint 31 is disposed at the corner portion 19. In the elbow joint 31, the central axis of the vertical portion 31 a rising vertically on the downstream side is deviated from the central axis of the horizontal portion 10 a of the inflow channel 10 located on the upstream side of the elbow joint 31. That is, in the flow passage 32 of the elbow joint 31, the flow passage 32 a formed in the horizontal portion 31 b disposed substantially horizontally extends obliquely with respect to the horizontal portion 10 a of the inflow passage 10. One end of the horizontal portion 10a of the inflow channel 10 is connected to the horizontal portion 31b in which such a flow passage 32a is formed, and the vertical portion 10b of the inflow channel 10 is connected to the vertical portion 31a.

  The rectifying means 30 flows through the horizontal portion 10 a of the inflow channel 10, and in the fluid having the flow velocity distribution 25, the portion 25 a having a high flow velocity coincides with the central axis of the vertical portion 31 a of the elbow joint 31. 31 is formed in the corner portion 19. For this reason, as shown in FIG. 6, the rectifying means 30 can be distributed toward the central axis of the vertical portion 31 a of the elbow joint 31 without biasing the distribution of the flow of the fluid flowing into the elbow joint 31. The generation of the swirling flow itself can be suppressed.

  The flow rate of the fluid in the rectifying means 30 is such that the inner diameters of the flow passage 32a in the horizontal portion 31b of the elbow joint 31 and the flow passage 32b in the vertical portion 31a are equivalent to the horizontal portion 10a of the inflow passage 10. , Ensure enough.

  In addition, the gas dissolving apparatus of this invention is not limited to the said embodiment. Various configurations are possible for the configuration, structure, shape, size, etc. of the dissolution tank and pump. For example, it is not always necessary to dispose the dissolution tank with respect to the horizontal direction, and a mode in which the dissolution tank is horizontally disposed is also included in the present invention. As shown in FIGS. 1 and 2, the lower portion 11 of the dissolution tank 2 may be provided with a gas exhaust valve 33 or the like stored in the dissolution tank 2 on the upper wall portion.

It is the perspective view which showed 1st Embodiment of the gas dissolving apparatus of this invention. It is a schematic block diagram of the gas dissolving apparatus shown in FIG. It is the schematic plan view which showed the pump periphery of the gas dissolving apparatus shown in FIG. It is the principal part schematic plan view which showed 2nd Embodiment of the gas dissolving apparatus of this invention. <a> <b> <c> are main part schematic plan views showing a modification of the rectifying means in the gas dissolving apparatus shown in FIG. It is the principal part schematic plan view which showed 3rd Embodiment of the gas dissolving apparatus of this invention. It is the top view which showed the problem with the swirl | flow which generate | occur | produces by connecting a corner part to the conventional gas dissolving apparatus. It is the principal part top view shown about the swirl | flow which generate | occur | produces by connecting a corner part to the conventional gas dissolving apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas dissolution apparatus 2 Dissolution tank 3 Pump 9 Inflow port 10 Inflow flow path 10a Horizontal part 10b Vertical part 12 Outflow port 17 Liquid 19 Corner part 23, 27, 30 Rectification means 24, 28, 32 Flow path 25a High-speed part 29 , 29a, 29b, 29c Rib 31 Elbow joint 31a Vertical part

Claims (4)

A dissolution tank provided with an inlet for introducing fluid into the inside from the bottom side, an outlet for extracting a gas-dissolved liquid from the bottom, and a pump for supplying fluid into the dissolution tank, and ejected from the inlet The fluid that flows into the dissolution tank is mixed with the gas stored in the dissolution tank or the gas supplied from the inlet along with the fluid, dissolved, and the dissolved liquid is discharged from the outlet to the outside of the dissolution tank. In the gas dissolving device to be taken out in
In the middle of the connection flow path of the fluid connecting the inlet and the pump, a corner portion that changes the flow path direction is connected, and at least one of the connection flow path downstream of the corner portion or the corner section, A gas dissolving apparatus comprising: a rectifying means having a fluid flow passage, wherein the rectifying means suppresses a swirling flow generated in a flow of fluid sent out from a pump.   2. The gas dissolving apparatus according to claim 1, wherein a cross-sectional shape inside the flow passage provided in the rectifying means is a polygon from a triangle to an octagon.   The gas dissolving device according to claim 1, wherein a rib projecting inward is disposed inside a flow passage provided in the rectifying means.   In the elbow joint, the central axis of the vertical portion rising vertically on the downstream side is displaced from the central axis of the flow path upstream of the elbow joint, and the portion of the fluid flowing through the upstream flow path has a high flow velocity. 2. The gas dissolving apparatus according to claim 1, wherein an elbow joint is disposed at a corner portion so as to substantially coincide with the central axis to form a rectifying means.

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