JP5903604B2 - Gas dissolving device - Google Patents

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 liquid 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

  In such a gas dissolving apparatus, it is desired to efficiently dissolve a gas in a liquid. In order to meet such a requirement, it is conceivable to increase the pressure in the gas-liquid mixing tank of the dissolution tank to increase the gas solubility limit amount and perform gas-liquid mixing. In order to further increase the pressure in the gas-liquid mixing tank of the dissolution tank, the flow path leading from the gas-liquid mixing tank to the intermediate tank, that is, the gas dissolved liquid generated in the gas-liquid mixing tank is intermediate tank It is conceivable to narrow the flow path for inflowing into the tube. According to the examination by the present applicant, there is a case where the gas is not completely dissolved in the liquid in the gas-liquid mixing tank, and bubbles mixed in the liquid block the narrowed flow path. In this case, the pressure in the gas-liquid mixing tank fluctuates, and the flow rate fluctuates with this pressure fluctuation, and gas-liquid mixing in the gas-liquid mixing tank may not be stable.

  The present invention has been made in view of the circumstances as described above, and it is possible to further stabilize the gas-liquid mixing in the gas-liquid mixing tank even when the pressure in the gas-liquid mixing tank of the dissolution tank is increased. It is an object to provide a gas dissolving device.

  In order to solve the above problems, a gas dissolving apparatus of the present invention includes a dissolving tank having an upper wall portion, a bottom wall portion, and a side wall portion and having a hollow inside, and the inside of the dissolving tank is divided into two partitions. The wall is divided into three tanks, a gas-liquid mixing tank, an intermediate tank, and a gas-liquid separation tank. These three tanks communicate with each other, and fluid flowing into the dissolution tank is gas in the gas-liquid mixing tank. And a liquid in which a gas is dissolved is generated, and the liquid flows in the intermediate tank and the gas-liquid separation tank in this order and flows out of the dissolution tank. The gas-liquid mixing tank And a partition wall that divides the intermediate tank extends from the upper wall portion toward the bottom wall portion, and has a convex portion protruding toward the bottom wall portion side and a top wall portion side at the tip thereof. An uneven portion having a recessed portion is provided, and the uneven portion and the bottom A gap serving as a flow path for the liquid in which the gas is dissolved is formed between the gap and a gap corresponding to the concave portion of the concavo-convex portion in the gap is a bubble mixed in the liquid in which the gas is dissolved. It is formed so that it can pass.

  In this gas dissolving apparatus, the concavo-convex part has a plurality of the convex part and the concave part, respectively, and the convex part and the concave part are formed on the entire front end of the partition wall that partitions the gas-liquid mixing tank and the intermediate tank. Are preferably formed alternately and continuously.

  In this gas dissolving apparatus, it is preferable that the concave portion of the concavo-convex portion is formed in a substantially semicircular shape.

  According to the gas dissolving apparatus of the present invention, it is possible to further stabilize the gas-liquid mixing in the gas-liquid mixing tank even when the pressure in the gas-liquid mixing tank of the dissolving tank is increased.

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 BB 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 sectional drawing of the dissolution tank in another one Embodiment of the gas dissolving apparatus of this invention.

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 BB cross-sectional view of the dissolution tank shown in FIG. FIG. 6 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. 1-6, the gas dissolving apparatus 1 includes an upper wall portion 2a, a bottom wall portion 2b opposite to the upper wall portion 2a, and a side wall portion surrounding the periphery of the upper wall portion 2a and the bottom wall portion 2b. And a hollow dissolution tank 2 having a slightly vertical 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 liquid 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 liquid 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 FIGS. 3-4, the first partition wall 3 is provided across the opposing side wall portions 2c and 2c in the dissolution tank 2, and extends downwardly from the upper wall portion 2a to the bottom wall portion 2b. ing. The first partition wall 3 is formed in a substantially flat plate shape. The tip 3a of the first partition wall 3 is provided with a concavo-convex portion M having a convex portion M1 protruding toward the bottom wall portion 2b and a concave portion M2 recessed toward the upper wall portion 2a. The uneven portion M does not reach the bottom wall portion 2 b, but a gap S is formed between the bottom wall portion 2 b, and the gas-liquid mixing tank 6 and the intermediate tank 7 communicate with each other using the gap S as a flow path for the liquid 5. ing. Here, the convex portion M1 of the concave and convex portion M can be formed so as to reach the bottom wall portion 2b.

  Assuming that the length direction is the direction between the opposing side wall portions 2c, 2c where the first partition wall 3 is provided, the concavo-convex portion M is provided over the entire length direction, and the convex portion M1. And the recesses M2 are provided alternately. As shown in FIG. 4, convex portions M1 and M1 are provided on both side portions in the length direction at the tip 3a of the first partition wall 3, and the concave portion M2 is about 2/3 of the total length in the length direction therebetween. An uneven portion M is formed.

  In the gap S2 formed between the concavo-convex portion M and the bottom wall portion 2b, the gap S2 corresponding to the concave portion M2 of the concavo-convex portion M has a liquid 5 without being completely dissolved in the liquid 5 in the gas-liquid mixing tank 6. It is formed so that a bubble can pass through as a passage region of the bubble mixed in. On the other hand, in the gap S, the gap S1 corresponding to the convex portion M1 of the concavo-convex portion M is set such that the height H1, that is, the interval between the concave portion M2 and the bottom wall portion 2b is lower than the height H2 of the gap S2. ing.

  The degree of opening of the gap S is set so that the pressure in the gas-liquid mixing tank 6 becomes a desired pressure, and according to this, the length in the length direction of the projections M1 and the depressions M2 in the projections and depressions M2 The degree is set. The degree of opening of the gap S, the length in the length direction of the convex portions M1 and the concave portions M2 in the concave and convex portion M, the degree of concave and convex, and the like can be set by preliminary experiments. The preliminary experiment can be performed with reference to data such as the volume of the gas-liquid mixing tank 6, the flow rate of the liquid flowing into and out of the gas-liquid mixing tank 6 and the intermediate tank 7, and the dissolution rate of the gas in the liquid.

  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 positioned below the upper wall 2a of the dissolution tank 2, and the intermediate tank 7 and the gas-liquid separation tank above the upper end 4a of the second partition wall 4. 8 communicate with each other.

  The second partition wall 4 is provided with a longitudinal rib 9 extending in the longitudinal direction of the dissolution tank 2 on the facing surface 4 b facing the first partition wall 3 so as to protrude toward the first partition wall 3. The vertical ribs 9 are formed in small pieces having a substantially rectangular shape, and are arranged in two rows at the lower end portion of the facing surface 4b with a space therebetween.

  Further, the second partition wall 4 is provided with a projecting portion 10 projecting upward at the center of the portion facing the first partition wall 3. The protrusion 10 is formed in a small piece having a substantially rectangular shape. The upper end 10a of the protruding portion 10 does not reach the upper wall portion 2a of the dissolution tank 2 and is disposed below the upper wall portion 2a.

  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. The outflow pipe connecting portion 13 is connected to one end portion of an outflow pipe that sends the liquid 5 in which the gas is dissolved 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 liquid 5 is generated.

  Furthermore, the dissolution tank 2 is provided with an exhaust part 15 provided with a gas release valve in a part corresponding to the upper end part of the gas-liquid separation tank 8 in the upper wall part 2a. When the liquid 5 is generated, the exhaust unit 15 has a float that floats and sinks following the liquid level of the liquid 5 in the gas-liquid separation tank 8 and can move in the vertical direction. The exhaust unit 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 part where the exhaust part 15 is provided in the upper wall part 2a of the dissolution tank 2 corresponds to the upper end part of the gas-liquid separation tank 8, and the boundary between the intermediate tank 7 and the gas-liquid separation tank 8 as shown in FIG. The inclined surface portion 2d is inclined obliquely downward from the 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 integrally incorporated in the upper unit 17, and the second partition wall 4 is integrally incorporated in the lower unit 18 including the vertical ribs 9 and the protrusions 10 provided here. 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. 6, 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. In addition, one end of an outflow pipe 24 for supplying a supply section for the liquid 5 in which a gas is dissolved, such as a bathtub, is connected to the outflow pipe connection section 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 a suction port 26 communicating with the inside of the bathtub to suck in 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. 6 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 dissolution apparatus 1, a gas that becomes a solute such as air in the liquid 5 in which the gas is dissolved is stored in the dissolution tank 2 before operation. When the pump 21 is operated and the operation is started, a fluid that becomes a solvent in the liquid 5 such as hot water in the bathtub is sucked from the suction port 26. The sucked fluid 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 fluid is caused by being pressurized to a predetermined pressure by the pump 21. In addition, prior to introducing the fluid into the gas-liquid mixing tank 6, the fluid can be mixed with the same type of gas as the gas stored in the dissolution tank 2 to form a gas-liquid mixed fluid. A gas-liquid mixed fluid is ejected into the liquid mixing tank 6. Hereinafter, the fluid alone (liquid) and the gas-liquid mixed fluid are collectively referred to as “fluid”.

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

The gas and fluid stored in the dissolution tank 2 are mixed by stirring at this time, and when the gas-liquid mixed fluid is ejected, the gas and fluid are mixed together with the gas in the gas-liquid mixed fluid. The dissolution of the gas is promoted, and the liquid 5 in which the gas is dissolved is generated. This is because the gas mixed as bubbles in the liquid 5 is subdivided by shearing by stirring, the surface area in contact with the fluid is increased, and the dissolved concentration of the gas near the liquid surface is reduced by homogenization by stirring, This is because the rate of dissolution of the gas into the fluid increases.
When the pressure in the gas-liquid mixing tank 6 is increased, the solubility limit amount of the gas in the fluid increases, and the gas can be effectively dissolved in the fluid.

  The liquid 5 in which the gas is dissolved in this manner flows into the intermediate tank 7 using the gap S between the tip 3a of the first partition wall 3 and the bottom wall 2b of the dissolution tank 2 as a flow path, and gradually the intermediate tank 7 It accumulates in. Since the liquid 5 flows into the intermediate tank 7 at the bottom of the dissolution tank 2, mixing of large bubbles into the liquid 5 is suppressed. Even if bubbles are mixed in the liquid 5, the bubbles can flow into the intermediate tank 7 through the gap S <b> 2. In the gap S, at least in the gap S2, the blockage of the flow path by the bubbles is suppressed, so that the pressure is further stabilized in the gas-liquid mixing tank 6, and the pressure fluctuation is suppressed. As the pressure fluctuation is suppressed, the fluctuation of the flow velocity of the fluid in the gas-liquid mixing tank 6 is also suppressed, and the gas and the liquid are mixed in the gas-liquid mixing tank 6 more stably. Becomes more stable. Thereby, dissolution of the gas is further promoted, and the gas can be efficiently dissolved in the fluid.

  In the example shown in FIG. 4, one recess M <b> 2 is formed over a wide range in the central portion in the length direction of the first partition wall 3, so that the bubbles can pass through the gap S <b> 2 more effectively. it can. In addition, the gaps S1 and S1 formed in the vicinity of both side portions in the length direction of the first partition wall 3 each have a smaller opening degree than the gap S2. For this reason, the flow rate when the liquid 5 passes through the gap S <b> 1 is fast, and it is difficult for the gap S <b> 1 to be blocked by bubbles mixed in the liquid 5. That is, the gap S in this example is formed at regular intervals between the tip 3 a of the first partition wall 3 and the bottom wall portion 2 b of the dissolution tank 2 over the entire length in the length direction of the first partition wall 3. Even when the gap and the flow path cross-sectional area of the liquid 5 are the same, the bubbles can be effectively passed through the gap S2. As a result, even if the channel cross-sectional area of the liquid 5 is not excessively increased, blockage due to bubbles can be prevented, and the pressure in the gas-liquid mixing tank 6 can be maintained in a relatively high state.

  When the liquid level of the liquid 5 exceeds the upper end 4 a of the second partition wall 4 in the intermediate tank 7, the liquid 5 flows into the gas-liquid separation tank 8. Thus, in the gas-liquid separation tank 8, before the liquid 5 flows out from the dissolution tank 2 to the outside by the second partition wall 4, the flow of the liquid 5 is lifted to the vicinity of the liquid surface, which is the gas-liquid interface. Large bubbles rise by buoyancy and burst at the liquid level. As a result, gas-liquid separation is promoted. Moreover, since the flow of the liquid 5 is a flow that passes over the upper end 4a of the second partition wall 4, it is a flow that passes through the liquid surface, and gas-liquid separation is also promoted when the liquid 5 passes over the second partition wall 4. .

  In addition, 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 liquid 5, Outflow of large bubbles existing near the surface can be suppressed. Bubbles are present densely toward the upper side of the liquid 5 to be stored, and large bubbles near the liquid surface do not exist so much near the bottom wall 2b. Since the liquid 5 flows out from the bottom of the dissolution tank 2 to the outside of the dissolution tank 2 through the outflow pipe connecting portion 13 and is taken out, the outflow of large bubbles is suppressed.

  The liquid 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 in the vicinity of one end portion 14 a facing the upper end portion of the dissolution tank 2 is higher than the pressure in the vicinity of the other end portion 14 b 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 dissolution tank 2 can be dissolved in the fluid while circulating. The gas introduced into the fluid through the gas circulation path 14 is taken into the fluid as bubbles, the contact area with the fluid 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 is increased and the flow rate is increased by dissolving the undissolved gas in the fluid, the gas-liquid stirring is further improved, and the improvement of the gas dissolution efficiency is promoted. This is effective for eliminating large bubbles. Further, since the other end portion 14b of the gas circulation path 14 faces the lower end portion of the dissolution tank 2, the contact distance between the fluid and the gas in the dissolution tank 2 can be secured to some extent, and the gas-liquid contact time is sufficient. It is ensured, and the improvement of the gas dissolution efficiency is further promoted. Since the gas dissolution efficiency is increased in this way, it is not necessary to lengthen the contact time between the gas and the fluid so much, so that the fluid path can be shortened, and the gas dissolution apparatus 1 is downsized.

  In the gas dissolving apparatus 1, the inside of the dissolving tank 2 is divided into the intermediate tank 7 and the gas-liquid separation tank 8, and the inside of the dissolving tank 2 is changed to the gas-liquid mixing tank 6 and the intermediate tank 7. Vertical ribs 9 are provided on the surface 4b facing the first partition wall 3 to be partitioned. The vertical rib 9 rectifies the flow of the liquid 5 in which the gas is dissolved from the gas-liquid mixing tank 6 on the upstream side to the intermediate tank 7 on the downstream side, and the flow direction becomes uniform in the vertical direction. As a result, the large bubbles are prevented from being mixed into the liquid 5, and the large bubbles are prevented from flowing out together with the liquid 5 flowing out of the dissolution tank 2 from the downstream gas-liquid separation tank 8. As described above, the gas dissolving apparatus 1 can be downsized, and can suppress the generation of turbulent flow in the gas-liquid separation tank 8 and suppress the outflow of large bubbles.

  In addition, since the vertical rib 9 may cause the pressure loss of the flow of the liquid 5, it is preferable to make the thickness thin in order to keep the pressure loss as low as possible. On the other hand, as the length in the vertical direction is longer, it contributes to the rectification of the liquid 5 and the flow direction of the liquid 5 can be controlled. Further, in order to rectify the liquid 5 more effectively, it is preferable that the number of the longitudinal ribs 9 is larger.

  Furthermore, in the gas dissolving apparatus 1, the vertical ribs 9 are provided on the surface 4 b of the second partition wall 4 facing the first partition wall 3 as described above, but in the first partition wall 3, the second partition wall The vertical ribs 9 may be provided on the surface 3 b facing 4. For example, when the width of the vertical rib 9 protruding to the intermediate tank 7 is somewhat large, the flow of the liquid 5 is the same as when the second partition wall 4 is provided on the surface 4b facing the first partition wall 3. Can be expected to control.

  Further, in the gas dissolving device 1, a protruding portion 10 that protrudes upward is provided at the center of the portion of the second partition wall 4 that faces the first partition wall 3. The flow of the liquid 5 flowing from the intermediate tank 7 into the gas-liquid separation tank 8 is branched in two directions on the left and right sides by the protrusion 10, and the liquid 5 flows along the tank wall in the intermediate tank 7. As a result, the flow velocity distribution of the liquid 5 in the intermediate tank 7 becomes uniform, the coalescence of bubbles is promoted, and the outflow of large bubbles is further suppressed.

  Such a gas dissolving apparatus of the present invention can further stabilize gas-liquid mixing in the gas-liquid mixing tank even when the pressure in the gas-liquid mixing tank of the dissolving tank is increased as shown in the above embodiment. Is possible.

Moreover, the gas circulation path 14 shown in FIGS. 1-4 and 6 is not necessarily essential for the gas dissolving apparatus of the present invention, and may be omitted as long as the gas is dissolved in the liquid 5 at a predetermined concentration. Is possible.

  FIG. 7 is a sectional view of a dissolution tank in another embodiment of the gas dissolving apparatus of the present invention. In addition, the same code | symbol is attached | subjected to the same part as embodiment shown to FIGS. 1-6, and the description is abbreviate | omitted.

  As shown in FIG. 7, the concavo-convex portion M has a plurality of vertically long convex portions M <b> 1 and a substantially semicircular concave portion M <b> 2, and the convex portion extends over the entire length in the length direction of the first partition wall 3. M1 and the recessed part M2 are formed alternately in a bowl shape. That is, a plurality of concave portions M2 are provided over the entire length in the length direction of the first partition wall 3 via the convex portions M1, and the gap S2 as the bubble passage region is a gap S in the length direction of the first partition wall 3. It is formed in the whole area. In this embodiment, since the effect of suppressing the blockage of the flow path due to the bubbles is given to the entire space S, the pressure in the gas-liquid mixing tank 6 can be further stabilized and the pressure fluctuation can be more effectively suppressed. it can. On the other hand, a plurality of vertically long convex portions M1 are also provided over the entire length in the length direction of the first partition wall 3 corresponding to the concave portions M2. When the liquid in which the gas is dissolved passes through the gap S, it collides with the projection M1. This collision also has an effect that bubbles mixed in the liquid are ruptured or subdivided and gas dissolution is promoted. Furthermore, the recess M2 of the present embodiment is formed in a substantially semicircular shape. Since the shape of the recess M2 is along the outer shape of the bubble, the bubble easily flows into the intermediate tank through the gap S2. As a result, the effect of suppressing the blockage of the flow path by the bubbles is further improved, and the pressure fluctuation in the gas-liquid mixing tank 6 can be further suppressed.

  The gas dissolving apparatus of the present invention is not limited to the above form. The shape and number of the convex portions and concave portions in the concave and convex portions can be appropriately designed as long as the effect of suppressing the blockage of the flow path by bubbles is not hindered. For example, the convex portion of the concavo-convex portion can be formed in a sharp mountain shape. Further, the concave portion of the concave and convex portion can be formed in a groove shape that is recessed at an acute angle. Moreover, the 1st partition wall 3 can be formed in a cylinder shape, and an uneven | corrugated | grooved part can also be formed in the whole tip or a part.

DESCRIPTION OF SYMBOLS 1 Gas dissolving apparatus 2 Dissolution tank 2a Upper wall part 2b Bottom wall part 2c Side wall part 3 1st partition wall 4 2nd partition wall 5 Liquid 6 Gas-liquid mixing tank 7 Intermediate tank 8 Gas-liquid separation tank M Concavity and convexity M1 Convex part M2 Concave portion S Clearance S2 Clearance of the portion corresponding to the concave portion of the uneven portion

Claims (3)

A dissolution tank having a top wall portion, a bottom wall portion and a side wall portion and having a hollow inside is provided. The three tanks are communicated with each other, and the fluid flowing into the dissolution tank is mixed with gas in the gas-liquid mixing tank to generate a liquid in which the gas is dissolved. A gas dissolving apparatus that sequentially flows through the intermediate tank and the gas-liquid separation tank and flows out of the dissolution tank;
A partition wall that divides the gas-liquid mixing tank and the intermediate tank extends from the upper wall portion toward the bottom wall portion, and at a tip thereof, a convex portion that protrudes toward the bottom wall portion side and the A concave / convex portion having a concave portion recessed on the upper wall portion side is provided, and a gap is formed between the concave / convex portion and the bottom wall portion as a flow path for the liquid in which the gas is dissolved. A gas dissolving device, wherein a gap corresponding to a concave portion of the portion is formed so as to be able to pass bubbles mixed in the liquid in which the gas is dissolved.   The concavo-convex portion has a plurality of the convex portions and the concave portions, and the convex portions and the concave portions are alternately and continuously formed on the entire tip of the partition wall that partitions the gas-liquid mixing tank and the intermediate tank. The gas dissolving apparatus according to claim 1, wherein the gas dissolving apparatus is provided.   The gas dissolution apparatus according to claim 1, wherein the concave portion of the concave and convex portion is formed in a substantially semicircular shape.

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