JP2013158758A - Gas dissolution device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas dissolution device capable of suppressing the outflow of large bubbles.SOLUTION: In a dissolution tank 2 of a gas dissolution device 1, a ridge-like uneven part M wherein recessed parts M1 and projecting parts M2 continue is provided along the upper end 4a of a second partition wall 4 partitioning an intermediate tank 7 and a gas-liquid separation tank 8, a highest water level in time of the overflow of a fluid 5 above the second partition wall 4 is set to be not more than the upper end of the projecting part M2 of the ridge-like uneven part M, and the fluid 5 passes inside the recessed parts M1 of the ridge-like uneven part M.

Description

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

  The present applicant has proposed a gas dissolution apparatus including a gas-liquid mixing tank, a large bubble outflow prevention tank (intermediate tank), and a dissolution tank partitioned into a gas-liquid separation tank (Patent Document 1).

  In the gas dissolution apparatus of Patent Document 1, the surface facing the first partition wall that partitions the gas-liquid mixing tank and the large bubble outflow prevention tank (intermediate tank) of the dissolution tank, or the first partition wall is opposed to the second partition wall. A vertical rib extending in the vertical direction of the dissolution tank is provided on the surface to be processed. For this reason, in the gas dissolving apparatus of Patent Document 1, in the large bubble outflow prevention tank (intermediate tank), the flow of the fluid in which the gas is dissolved is rectified, the flow direction becomes uniform in the vertical direction, and large bubbles in the liquid Can be prevented from being mixed.

JP 2010-227782

  On the other hand, according to the subsequent studies by the present inventors, in the gas dissolving apparatus of Patent Document 1, it is considered that there is room for further study and improvement regarding gas-liquid separation in the gas-liquid separation tank of the dissolution tank. It was. That is, if it was possible to promote coalescence of bubbles in the fluid in the gas-liquid separation tank of the dissolution tank, it was thought that the larger bubbles in the fluid were further separated, and the outflow of the larger bubbles could be more reliably suppressed. .

  This invention is made | formed in view of the above situations, and makes it a subject to provide the gas dissolving apparatus which can suppress the outflow of a big bubble.

  In order to solve the above-mentioned problems, the gas dissolving apparatus of the present invention is a gas-liquid mixing system in which the interior of the first partition wall and the second partition wall is from the upstream side to the downstream side with respect to the fluid flow. A dissolution tank divided in order of a tank, an intermediate tank, and a gas-liquid separation tank, and a fluid flowing into the dissolution tank is mixed with a gas in the gas-liquid mixing tank to generate a fluid in which the gas is dissolved. Is a gas dissolving device that sequentially flows through the intermediate tank and the gas-liquid separation tank and flows out from the lower part of the gas-liquid separation tank to the outside of the dissolution tank, and divides the intermediate tank and the gas-liquid separation tank A saddle-like uneven part in which a concave part and a convex part are continuous is provided along the upper end of the second partition wall, and the highest water level at the time of fluid overflow above the second partition wall is the convex part of the saddle-like uneven part. The top of the head is below the top, and the fluid It is characterized by passing the inner.

  In this gas dissolving apparatus, it is preferable that the bowl-shaped uneven portion is formed of a porous material or a material having surface unevenness.

  In this gas dissolving apparatus, it is more preferable that the bowl-shaped uneven portion is positively charged.

  According to the gas dissolving apparatus of the present invention, the outflow of large bubbles can be suppressed.

It is the partially cutaway perspective view which illustrated the dissolution tank in one embodiment of the gas dissolution apparatus of the present invention. It is a front view of the dissolution tank shown in FIG. It is a longitudinal cross-sectional view from the back side of the dissolution tank shown in FIG. It is AA sectional drawing of the dissolution tank shown in FIG. It is the perspective view which illustrated one Embodiment of the gas dissolving apparatus of this invention provided with the dissolution tank shown in FIG. It is the schematic perspective view which illustrated one form of the bowl-shaped uneven part provided in the upper end of the 2nd partition wall of the dissolution tank with which the gas dissolution apparatus of the present invention is equipped.

  FIG. 1 is a partially cutaway perspective view illustrating a dissolution tank in an embodiment of a gas dissolving apparatus of the present invention. FIG. 2 is a front view of the dissolution tank shown in FIG. 3 is a longitudinal sectional view from the back side of the dissolution tank shown in FIG. 4 is a cross-sectional view taken along the line AA of the dissolution tank shown in FIG. FIG. 5 is a perspective view illustrating an embodiment of the gas dissolving apparatus of the present invention including the dissolving tank shown in FIG.

  As shown in FIGS. 1-5, the gas dissolution apparatus 1 includes a hollow dissolution tank 2 having a slightly vertically long box shape. Two partition walls, that is, a first partition wall 3 and a second partition wall 4 are provided inside the dissolution tank 2, and the gas-liquid mixing tank 6 is located upstream of the flow of the fluid 5, which will be described later. A partition is formed by one partition wall 3. An intermediate tank 7 is defined by the second partition wall 4 together with the first partition wall 3 on the downstream side of the gas-liquid mixing tank 6, and the intermediate tank 7 is disposed adjacent to the gas-liquid mixing tank 6. On the most downstream side with respect to the flow of the fluid 5, the gas-liquid separation tank 8 is partitioned by the second partition wall 4 and is disposed adjacent to the intermediate tank 7.

  As shown in FIG. 3, the first partition wall 3 extends downwardly from the upper wall portion 2 a to the bottom wall portion 2 b of the dissolution tank 2. The first partition wall 3 is formed in a substantially flat plate shape. On the other hand, the lower end 3a of the first partition wall 3 does not reach the bottom wall portion 2b, but a gap is formed between the bottom wall portion 2b. 7 communicate with each other.

  The second partition wall 4 extends vertically upward from the bottom wall portion 2b of the dissolution tank 2 toward the upper wall portion 2a. The 2nd partition wall 4 is formed in a cylinder shape, and the cross section has an oval shape. The upper end 4a of the second partition wall 4 located on the intermediate tank 7 side is provided with a bowl-shaped uneven portion M in which the concave portion M1 and the convex portion M2 are continuous along the upper end 4a. The upper end T of the convex portion M2 is formed in an acute mountain shape, and the concave portion M1 is formed in a groove shape recessed at an acute angle between the adjacent convex portions M2.

  The bowl-shaped uneven part M is located below the upper wall part 2a of the dissolution tank 2, and the intermediate tank 7 and the gas-liquid separation tank 8 communicate with each other above the bowl-like uneven part M. Further, in the bowl-shaped uneven part M, the highest water level when the fluid 5 overflows above the second partition wall 4 is set to be equal to or lower than the upper end T of the convex part M2, and the fluid 5 passes through the concave part M1 of the bowl-shaped uneven part M. It is formed to pass.

  Moreover, it is preferable that the bowl-shaped uneven part M is formed of a porous material or a material having surface unevenness. Furthermore, it is also preferable that the bowl-shaped uneven part M is positively charged.

  In addition, the dissolution tank 2 is provided with an inflow pipe connecting portion 12 that opens downward on the bottom wall portion 2 b of the gas-liquid mixing tank 6. The other end of the inflow pipe having one end connected to the discharge side of the pump, which will be described later, is connected to the inflow pipe connecting portion 12. The gas-liquid separation tank 8 is provided with an outflow pipe connecting portion 13 that opens to the front side at the lower end. Connected to the outflow pipe connecting portion 13 is one end of an outflow pipe that feeds the fluid (liquid in which gas is dissolved) 5 generated in the dissolution tank 2 to a supply section such as a bathtub.

  Furthermore, the dissolution tank 2 is provided with a gas circulation path 14 that connects the upper end portion and the lower end portion of the dissolution tank 2 through the outside of the dissolution tank 2 and communicates with each other. As will be described later, the gas circulation path 14 is used for temporarily removing the gas stored in the dissolution tank 2 from the dissolution tank 2 and circulating it back into the dissolution tank 2 when the fluid 5 is generated.

  Furthermore, the dissolution tank 2 is provided with a gas release valve 15 in a portion corresponding to the upper end portion of the gas-liquid separation tank 8 in the upper wall portion 2a. The gas release valve 15 has a float which floats and sinks following the height of the liquid surface of the fluid 5 in the gas-liquid separation tank 8 and can move in the vertical direction when the fluid 5 is generated. The gas release valve 15 can release and stop the gas stored in the dissolution tank 2 by moving the float up and down as the liquid level changes. The portion of the upper wall 2a of the dissolution tank 2 where the gas release valve 15 is provided corresponds to the upper end of the gas-liquid separation tank 8, and as shown in FIG. 2, the intermediate tank 7 and the gas-liquid separation tank 8 The inclined surface portion 2c is inclined obliquely downward from the boundary portion 16 toward the edge of the upper wall portion 2a of the dissolution tank 2 facing the boundary portion 16.

  The dissolution tank 2 as described above is also divided slightly below the center in the height direction, with the upper unit 17 being the upper side and the lower unit 18 being the lower side. The first partition wall 3 is integrated into the upper unit 17 and the second partition wall 4 is integrated into the lower unit 18. Further, flange portions 19 and 20 are provided on the lower end edge portion of the upper unit 17 and the upper end edge portion of the lower unit 18 so as to protrude outward. The melting tank 2 is configured to fasten the upper unit 17 and the lower unit 18 with bolts at predetermined portions of the overlapping flange portions 19 and 20 by using bolts and, if necessary, nuts, by overlapping the flange portions 19 and 20 with each other. Assemble and unite.

  As shown in FIG. 5, in the gas dissolution apparatus 1, the dissolution tank 2 has one end connected to the discharge side of a pump 21 arranged in a column below the dissolution tank 2 in the inflow pipe connection portion 12. The other end of the inflow pipe 22 is connected. The gas circulation path 14 connected to the upper wall portion 2a of the dissolution tank 2 at one end portion 14a is connected to the gas circulation ejector 23 disposed at the connection portion between the inflow pipe 22 and the inflow pipe connection portion 12 at the other end portion 14b. It is connected to the. Further, one end portion of an outflow pipe 24 for supplying a supply portion for a fluid (liquid in which gas is dissolved) 5 such as a bathtub is connected to the outflow pipe connection portion 13 of the dissolution tank 2.

  The suction side of the pump 21 is connected to the other end of the suction pipe 25 which is connected to a supply unit such as a bathtub and connected to one end. For example, in the case of a bathtub, one end of the suction pipe 25 communicates with the suction port 26 communicating with the inside of the bathtub to suck hot water in the bathtub, and the other end of the outflow pipe 24 connected to the outflow pipe connecting portion 13. The end portion communicates with the inside of the bathtub, and communicates with the discharge port 27 for discharging hot water in which the air is dissolved in the bathtub. FIG. 5 illustrates a suction / discharge plug 28 having both the suction port 26 and the discharge port 27. The suction / discharge plug 28 is attached to, for example, a tank wall of a bathtub, and has a first flow path that communicates from the suction port 26 to the suction pipe 25 and a second flow that communicates from the discharge port 27 to the outflow pipe 24. And road. The first flow path and the second flow path are independent from each other in the suction / discharge plug 28 and do not communicate with each other.

  In the gas dissolving device 1, the gas supply port 29 is disposed above the upper wall 2 a of the dissolving tank 2 in order to keep the gas concentration in the dissolving tank 2 high, and the suction side of the pump 21 is arranged. The gas introduction ejector 30 can be interposed in the vicinity of the connection portion between the suction pipe 25 and the suction pipe 25. The gas supply port 29 and the gas introduction ejector 30 are connected in communication via a gas introduction pipe 31.

  In such a gas dissolving apparatus 1, a gas that becomes a solute such as air in the fluid (liquid in which the gas is dissolved) 5 is stored in the dissolution tank 2 before operation. When the pump 21 is operated and the operation is started, a liquid that becomes a solvent in the fluid 5 such as hot water in the bathtub is sucked from the suction port 26. The sucked liquid is supplied from the lower part to the gas-liquid mixing tank 6 of the dissolution tank 2 through the suction pipe 25 and the inflow pipe 22 and is ejected to the gas-liquid mixing tank 6. This ejection of liquid is caused by being pressurized to a predetermined pressure by the pump 21. The fluid introduced into the gas-liquid mixing tank 6 can also be a gas-liquid mixed fluid in which a liquid and the same type of gas as the gas stored in the dissolution tank 2 are mixed. A gas-liquid mixed fluid is ejected into the mixing tank 6. Hereinafter, the fluid alone (liquid) and the gas-liquid mixed fluid are collectively referred to as “fluid”.

  The fluid 5 jets and flows into the gas-liquid mixing tank 6 shown in FIG. 1-5 toward the inner surface of the upper wall portion 2a of the dissolution tank 2. At this time, the fluid 5 collides with the upper wall portion 2 a of the dissolution tank 2 and the first partition wall 3, rebounds, and gradually accumulates at the bottom of the gas-liquid mixing tank 6. Moreover, the fluid 5 that collides with the inner surface of the upper wall portion 2 a and rebounds collides with the liquid surface of the fluid 5 stored in the gas-liquid mixing tank 6, thereby stirring the fluid 5.

  The gas stored in the dissolution tank 2 and the fluid 5 are mixed by stirring at this time, and when the gas-liquid mixed fluid is ejected, the gas and the fluid 5 are also combined with the gas in the gas-liquid mixed fluid. Mixing is promoted to dissolve the gas, and the fluid 5 in which the gas is dissolved is generated. This is because the gas mixed as bubbles in the fluid 5 is subdivided by shearing by stirring, the surface area in contact with the fluid 5 is increased, and the dissolved concentration of the gas near the liquid surface is reduced by homogenization by stirring. This is because the dissolution rate of the gaseous fluid 5 increases.

  The fluid 5 in which the gas is dissolved in this way flows into the intermediate tank 7 using the gap between the lower end 3a of the first partition wall 3 and the bottom wall 2b of the dissolution tank 2 as a flow path, and gradually enters the intermediate tank 7. Accumulate. Since the fluid 5 flows into the intermediate tank 7 at the bottom of the dissolution tank 2, mixing of large bubbles into the fluid 5 is suppressed.

  When the liquid level (water level) of the fluid 5 approaches the upper end 4a of the second partition wall 4 in the intermediate tank 7, in the gas-liquid separation tank 8, the liquid in which the flow of the fluid 5 is a gas-liquid interface by the second partition wall 4. Since it is lifted to the vicinity of the surface, large bubbles rise by buoyancy and rupture at the liquid level. As a result, gas-liquid separation is promoted.

  When the liquid level (water level) of the raised fluid 5 exceeds the upper end 4a of the second partition wall 4, the maximum water level when the fluid 5 overflows is equal to or lower than the upper end T of the convex portion M2 of the bowl-shaped uneven portion M. Therefore, the fluid 5 flows into the gas-liquid separation tank 8 through the recess M1 of the bowl-shaped uneven portion M. When the fluid 5 gets over the upper end 4 a of the second partition wall 4, the fluid 5 is collected in the recess M <b> 1 of the bowl-shaped uneven portion M, thereby promoting the coalescence of bubbles contained in the fluid 5. And since the surplus coalescing unity is discharged into the gas phase above the gas-liquid separation tank 8, gas-liquid separation is promoted and the outflow of large bubbles can be suppressed.

  Further, when the bowl-shaped irregularities M are formed of a porous material or a material having surface irregularities, particularly when the fluid 5 passes through the depressions M1 of the bowl-like irregularities M, the inflow side ( Air bubbles easily adhere to the vicinity of the intermediate tank). For this reason, coalescence of bubbles and release into the gas phase are further promoted, gas-liquid separation is promoted, and outflow of large bubbles can be further suppressed. Examples of the porous material include a foamable resin. In addition, as the material having surface irregularities, for example, a material having a high surface roughness among materials assumed to be applied to the dissolution tank can be appropriately selected.

  Further, the bubbles in the fluid 5 are negatively charged. Therefore, when the bowl-shaped irregularities M are positively charged, when the fluid 5 passes through the depressions M1 of the bowl-like irregularities M, bubbles are generated particularly near the inflow side (intermediate tank side) of the depressions M1. It becomes easy to adhere. For this reason, the coalescence of bubbles and the release into the gas phase are further promoted, gas-liquid separation is promoted, and the outflow of large bubbles can be further suppressed. Examples of a method of positively charging the bowl-shaped irregularities M include, for example, a method of mixing magnetic powder and a charging component into the resin constituting the material of the bowl-shaped irregularities M, or a bowl-like shape by flowing electricity through the second partition wall 4. A method of positively charging the uneven portion M can be exemplified. Therefore, the bowl-shaped uneven part M can be formed of a porous material or a material having surface unevenness and can be positively charged.

  Further, since the gas-liquid separation tank 8 is provided with the outflow pipe connecting portion 13 on the bottom wall portion 2b of the dissolution tank 2, even if bubbles due to undissolved gas are mixed in the fluid 5, Outflow of large bubbles existing near the surface can be suppressed. Bubbles are present densely toward the upper side of the fluid 5 to be stored, and large bubbles near the liquid surface do not exist so much near the bottom wall 2b. Since the fluid 5 flows out from the bottom of the dissolution tank 2 to the outside of the dissolution tank 2 through the outflow pipe connection portion 13 and is taken out, the outflow of large bubbles is suppressed.

  The fluid 5 flowing out of the dissolution tank 2 through the outflow pipe connecting portion 13 is sent out from the discharge port 27 to a supply section such as a bathtub through the outflow pipe 24 shown in FIG.

  Further, in the gas dissolving apparatus 1, during operation, a pressure difference is generated near both ends of the one end portion 14a and the other end portion 14b of the gas circulation path 14 in the dissolving tank 2. The pressure near one end portion 14a facing the upper end portion of the dissolution tank 2 is higher than the pressure near the other end portion 14b facing the lower end portion of the dissolution tank 2. In accordance with this pressure difference, the gas circulation ejector 23 sucks the undissolved gas stored in the upper part of the dissolution tank 2 and flows through the gas circulation path 14 from the one end portion 14a to the other end portion 14b. , And sent out to the gas-liquid mixing tank 6 of the dissolution tank 2.

  Thus, in the gas dissolving device 1, the gas stored in the dissolving tank 2 can be dissolved in the fluid 5 while circulating. The gas introduced into the fluid 5 via the gas circulation path 14 is taken into the fluid 5 as bubbles, the contact area with the fluid 5 is large, and the gas dissolution efficiency is increased. Further, since the undissolved gas is taken out from the upper end of the dissolution tank 2 to the gas circulation path 14, the gas can be circulated until there is no undissolved gas, and a long-time circulation operation is possible. Moreover, since the volume flow rate of the fluid 5 is increased and the flow velocity is increased by the amount of the undissolved gas dissolved in the fluid 5, the gas-liquid stirring is further improved, and the improvement of the gas dissolution efficiency is promoted. At the same time, it is effective in eliminating large bubbles.

  As shown in the embodiment, the gas dissolving device 1 of the present invention can sufficiently suppress the outflow of large bubbles when the fluid 5 in which the gas is dissolved flows out of the dissolving tank 2 to the outside.

  Moreover, the gas circulation path 14 shown in FIGS. 1-5 is not necessarily essential for the gas dissolving apparatus of the present invention, and can be omitted as long as the gas is dissolved in the fluid 5 at a predetermined concentration. .

  FIG. 6 is a schematic perspective view illustrating one form of the bowl-shaped uneven portion provided at the upper end of the second partition wall of the dissolution tank provided in the gas dissolution apparatus of the present invention. FIG. 6 shows the form of the upper end of the second partition wall as seen from the gas-liquid separation tank side.

  A plurality of vertical ribs M as the convex portions M2 are erected at substantially equal intervals along the upper end 4a of the second partition wall 4 of the dissolution tank 2, and the vertical ribs F shown in FIG. A recess M1 is formed between the two. The vertical ribs F have a flat plate shape and are arranged substantially in parallel in the direction from the intermediate tank 7 side to the gas-liquid separation tank 8 side (flow direction of the fluid 5). Further, even in such a configuration in which the bowl-shaped irregularities M are arranged, when the fluid 5 overflows, the highest water level when the fluid 5 overflows is the convexity of the bowl-shaped irregularities M. It is made below the upper end T of the part M2 (vertical rib F). For this reason, the fluid 5 flows into the gas-liquid separation tank 8 through the recessed portion M1 of the bowl-shaped uneven portion M. When the fluid 5 gets over the upper end 4 a of the second partition wall 4, the fluid 5 is collected in the recess M <b> 1 of the bowl-shaped uneven portion M, thereby promoting the coalescence of bubbles contained in the fluid 5. And since the surplus coalescing unity is discharged into the gas phase above the gas-liquid separation tank 8, gas-liquid separation is promoted and the outflow of large bubbles can be suppressed.

  The gas dissolving apparatus of the present invention is not limited to the above form. For example, the shape, height, width, number, and the like of the concave portions M1 and the convex portions M2 in the bowl-shaped concave and convex portion M can be appropriately designed as long as the bubble coalescing effect is not hindered. Further, for example, as in Patent Document 1, vertical fluid can be provided on the first partition wall or the second partition wall to rectify the fluid.

DESCRIPTION OF SYMBOLS 1 Gas dissolving apparatus 2 Dissolution tank 3 1st partition wall 4 2nd partition wall 5 Fluid 6 Gas-liquid mixing tank 7 Intermediate tank 8 Gas-liquid separation tank M A bowl-shaped uneven part M1 Concave part M2 Convex part

Claims (3)

The dissolution tank is divided into a gas-liquid mixing tank, an intermediate tank, and a gas-liquid separation tank in this order from the upstream side to the downstream side with respect to the flow of the fluid by the two partition walls of the first partition wall and the second partition wall. And a fluid flowing into the dissolution tank is mixed with gas in the gas-liquid mixing tank to generate a fluid in which the gas is dissolved, and the fluid flows in the intermediate tank and the gas-liquid separation tank in order, A gas dissolving device that flows out of the dissolution tank from the lower part of the separation tank,
A saddle-like uneven portion in which a concave portion and a convex portion are continuous is provided along an upper end of the second partition wall that partitions the intermediate tank and the gas-liquid separation tank, and is provided above the second partition wall. A gas dissolving apparatus characterized in that the maximum water level at the time of fluid overflow is not higher than the upper end of the convex portion of the bowl-shaped uneven portion, and the fluid passes through the concave portion of the bowl-shaped uneven portion.   The gas dissolution apparatus according to claim 1, wherein the ridge-shaped uneven portion is formed of a porous material or a material having surface unevenness.   The gas dissolution apparatus according to claim 1, wherein the bowl-shaped uneven portion is positively charged.

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