JP5001321B2 - 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 injects the pumped fluid from the upper part of the dissolution tank onto the liquid level of the liquid stored therein, mixes the liquid and the gas in the dissolution tank, dissolves the gas in the liquid, A gas dissolution apparatus that generates a dissolution liquid has been proposed (Patent Document 1).

  However, as in the gas dissolution apparatus described in Patent Document 1, in general, the liquid is mixed from the liquid by injecting the fluid from the upper part of the dissolution tank and the gas is dissolved in the liquid. There was a shortage and there was a limit to the amount of gas dissolved.

  In Patent Document 2, an injection nozzle that injects a gas-liquid mixed fluid toward the inside of the liquid bubble dissolution tank is disposed at the bottom of the liquid bubble dissolution tank, and the treatment liquid discharge unit that discharges the processing liquid in the liquid bubble dissolution tank is also a liquid bubble. A gas dissolution amount adjuster disposed at the bottom of the dissolution tank is described. In this gas dissolution amount adjuster, the gas-liquid mixed fluid is injected from the bottom of the liquid bubble dissolution tank into the liquid bubble dissolution tank, so that the liquid is sufficiently stirred and the gas dissolution amount increases, but the processing liquid discharge unit The gas-liquid mixed fluid that flows out from the tank has a problem that large bubbles dispersed in the liquid by mixing are also mixed and easily flow out together.

  The gas dissolution amount adjuster includes a gas recirculation unit that recirculates the undissolved gas around the uppermost part in the liquid bubble dissolution tank to the suction chamber of the ejector unit having the injection nozzle. A large amount of undissolved gas accumulated in the upper part of the liquid bubble dissolution tank can be sucked into the suction chamber by the gas recirculation part, and the undissolved gas is entrained in the gas-liquid mixed fluid injected from the injection nozzle and returned to the liquid bubble dissolution tank. Can be made. For this reason, the gas dissolution amount adjuster also has an advantage that the dissolved concentration of gas can be increased by making the maximum use of undissolved gas.

Japanese Patent Laid-Open No. 2005-95878 JP 2004-298840 A

  However, it is pointed out that, in a dissolution tank that generates a liquid in which a gas is dissolved, the gas stored in the dissolution tank is likely to accumulate in the upper corner portion, and it is difficult to remove the accumulated gas to the outside of the dissolution tank. The liquid bubble dissolution tank described in Patent Document 2 provided with a gas reflux part is no exception, and the gas accumulated at the upper end corner in the liquid bubble dissolution tank is actually difficult to remove by the gas reflux part. There is a limit to the increase in the amount of dissolved gas.

  An object of the present invention is to provide a gas dissolving device that can reliably take out and circulate gas in a dissolution tank and sufficiently increase the amount of gas dissolved in a liquid.

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

In the first aspect of the present invention, a gas-liquid mixing tank, a large bubble outflow prevention tank, and a gas-liquid separation are performed from the upstream side to the downstream side with respect to the flow of the liquid by the two partition walls of the first partition wall and the second partition wall. The tank is divided in order, and the gas-liquid separation tank and the large bubble spill prevention tank are provided with a dissolution tank that communicates with each other in the upper part, and the liquid flowing into the dissolution tank is mixed with the gas in the gas-liquid mixing tank. Dissolved liquid is generated, and the liquid flows in the large bubble outflow prevention tank and the gas-liquid separation tank in order, and flows out from the lower part of the gas-liquid separation tank to the outside of the dissolution tank. The portion corresponding to the upper end portion of the gas-liquid separation tank is an inclined surface portion, and the inclined surface portion is formed on the upper wall portion of the dissolution tank facing the boundary portion from the boundary portion between the gas-liquid separation tank and the large bubble outflow prevention tank. Inclined downward toward the edge, large bubble flow A gas outlet is formed in the upper wall of the dissolution tank corresponding to the upper end of the prevention tank, and once the gas stored in the dissolution tank is taken out, it is returned to the dissolution tank and circulated through one end of the gas circulation path. The portion is connected to the gas outlet.

  According to a second aspect of the present invention, in the first aspect of the present invention, the liquid surface has a float that floats and sinks following the liquid level in the gas-liquid separation tank and is movable in the vertical direction. As the float moves up and down with the change of the gas, a gas release valve that releases and stops the gas stored in the dissolution tank is provided on the inclined surface portion of the dissolution tank. A gas vent is formed so that the gas in the dissolution tank enters from the lateral direction.

  According to the first aspect of the present invention, the upper wall portion of the dissolution tank has the inclined surface portion corresponding to the upper end portion of the gas-liquid separation tank and the upper portion of the dissolution tank corresponding to the upper end portion of the large bubble outflow prevention tank. Since one end of a gas circulation path for circulating the gas stored in the dissolution tank is connected to the gas outlet formed in the wall, the gas stored in the dissolution tank is connected to the gas circulation path. It becomes easy to escape and undissolved gas can be reliably taken out and circulated. Undissolved gas stored in the dissolution tank can be fully utilized and dissolved, and the amount of dissolved gas in the liquid increases.

  According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, since the gas release valve is provided on the inclined surface portion of the dissolution tank, the space required for mounting the gas release valve is reduced, including the gas release valve. Further downsizing of the gas dissolving apparatus is promoted. Further, since the gas vent in the gas release valve is formed so that the gas enters from the lateral direction with respect to the float, bubbles in the liquid are not directly discharged from the gas release valve to the outside of the dissolution tank. The gas is once stored in the dissolution tank, and the gas can be reliably circulated through the gas circulation path. It is possible to suppress a decrease in the gas-liquid ratio of the generated liquid.

It is the partially cutaway perspective view which showed the dissolution tank in one Embodiment of the gas dissolving apparatus of this invention. It is a front view of the dissolution tank shown in FIG. It is the longitudinal cross-sectional view seen 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 showed one Embodiment of the gas dissolving apparatus of this invention provided with the dissolution tank shown in FIG. It is the partially cutaway perspective view which looked at the dissolution tank shown in FIG. 1 from diagonally downward. FIG. 6 is an enlarged cross-sectional view showing an enlarged vicinity of a gas release valve of the dissolution tank shown in FIG. 5.

  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 liquid 5, which will be described later. A partition is formed by one partition wall 3. In addition, a large bubble outflow prevention tank 7 is formed on the downstream side of the gas-liquid mixing tank 6 by the second partition wall 4 together with the first partition wall 3, and the large bubble outflow prevention tank 7 is adjacent to the gas-liquid mixing tank 6. Are arranged. 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 large bubble outflow prevention 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 3 a of the first partition wall 3 does not reach the bottom wall portion 2 b, and a gap is formed between the bottom wall portion 2 b and the gas-liquid mixing tank 6 and the large bubble are formed using this gap as a flow path for the liquid 5. The outflow prevention tanks 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 4 a of the second partition wall 4 is located below the upper wall portion 2 a of the dissolution tank 2, and the large bubble outflow prevention tank 7 and the gas-liquid separation tank 8 communicate with each other at the upper part of the dissolution tank 2.

  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. The vertical rib 9 can also be provided on the surface 3 b of the first partition wall 3 that faces the second partition wall 4.

  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.

  Such a dissolution tank 2 is provided with a lateral rib 11 at the upper end of the gas-liquid separation tank 8. The lateral ribs 11 are arranged in parallel with respect to the flow of the liquid 5 in the gas-liquid separation tank 8. The direction substantially coincides with the width direction of the vertical rib 9 protruding into the large bubble outflow prevention tank 7 and extends in a direction substantially orthogonal to the protruding portion 10 provided on the second partition wall 4. .

  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. For this reason, as shown in FIG. 3, the one end part 14a of the gas circulation path 14 is connected to the gas outlet 32 formed in the upper wall part 2a of the dissolution tank 2 corresponding to the upper end part of the large bubble outflow prevention tank 7. It is connected. The other end 14 b of the gas circulation path 14 is connected to the lower end of the gas-liquid mixing tank 6.

  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. As shown in FIGS. 5 and 8, the gas release valve 15 floats and sinks following the height of the liquid surface 33 of the liquid 5 in the gas-liquid separation tank 8 when the liquid 5 is generated, and is movable in the vertical direction. A float 34 is provided, and the float 34 moves up and down as the liquid level changes, whereby the gas stored in the dissolution tank 2 is released and stopped. 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 large bubble outflow prevention tank 7 and the gas-liquid separation tank 8 is an inclined surface portion 2c that is inclined obliquely downward from the boundary portion 16 to the edge portion of the upper wall portion 2a of the dissolution tank 2 facing the boundary portion 16.

  As shown in FIGS. 5 and 7, the gas release valve 15 has a gas vent 35 that is a cross section of the second partition wall 4 so that the gas in the dissolution tank 2 enters from the lateral direction with respect to the float 34. It is formed to open to the side that is the same direction as the longitudinal direction of the substantially oval, and is disposed on both the left and right sides of the gas release valve 15. The gas release valve 15 has a gas discharge port 37 formed at the top of the float chamber 36 that accommodates the float 34, and the float chamber 36 communicates with the outside through the gas discharge port 37. The lateral rib 11 is disposed at the upper end of the gas-liquid separation tank 8 almost directly below the gas release valve 15.

  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 dissolving apparatus 1, the melting tank 2 has one end connected to the discharge side of a pump 21 arranged in a column below the dissolving tank 2 in the inflow pipe connecting 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 communicating from the suction port 26 to the suction pipe 25 and a second flow communicating 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 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 fluid is subdivided by shearing by agitation, and the surface area in contact with the fluid increases, and the dissolved concentration of the gas near the liquid surface is reduced by homogenization by agitation. This is due to an increase in the dissolution rate of the liquid into the fluid.

  The liquid 5 in which the gas is dissolved in this way flows into the large bubble outflow prevention tank 7 using the gap between the lower end 3a of the first partition wall 3 and the bottom wall portion 2b of the dissolution tank 2 as a flow path, and gradually increases. It accumulates in the bubble outflow prevention tank 7. Since the liquid 5 flows into the large bubble outflow prevention tank 7 at the bottom of the dissolution tank 2, mixing of large bubbles into the liquid 5 is suppressed.

  When the liquid level of the liquid 5 exceeds the upper end 4 a of the second partition wall 4 in the large bubble outflow prevention 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, a portion corresponding to the upper end portion of the gas-liquid separation tank 8 in the upper wall portion 2 a of the dissolving tank 2 is the inclined surface portion 2 c and corresponds to the upper end portion of the large bubble outflow prevention tank 7. One end portion 14a of the gas circulation path 14 for circulating the gas stored in the dissolution tank 2 is connected to the gas outlet 32 formed in the upper wall portion 2a of the dissolution tank 2 to be dissolved. The gas stored inside is easily released to the gas circulation path 14. For this reason, in the gas-liquid separation tank 8, undissolved gas stored in the upper corner of the dissolution tank 2 or the like can be reliably taken out from the gas outlet 32, and the lower end of the gas-liquid mixing tank 6 through the gas circulation path 14. The undissolved gas can be reliably circulated. The undissolved gas stored in the dissolution tank 2 can be fully utilized and dissolved in the fluid, and the amount of gas dissolved in the liquid 5 increases.

  As the gradient of the inclined surface portion 2c increases, the buoyancy of bubbles in the liquid 5 becomes larger than the flow of the liquid 5, and the gas is easily collected at the gas outlet 32.

  Moreover, in the gas dissolving apparatus 1, since the gas release valve 15 is provided in the inclined surface part 2c of the dissolution tank 2, the space required for attachment of the gas release valve 15 is reduced, and the gas dissolving apparatus including the gas release valve 15 is included. The miniaturization of 1 is promoted.

  In addition, since the gas vent 35 is formed in the gas release valve 15 so that the gas enters the float 34 from the lateral direction, the bubbles in the liquid 5 directly pass from the gas release valve 15 to the outside of the dissolution tank 2. Will not be released. As shown in FIG. 8, when the liquid level 33 reaches the float chamber 36 during the gas-liquid separation, the bubbles in the liquid 5 hit the upper wall portion 2 a of the dissolution tank 2, and the gas reservoir 38 is moved to the gas release valve 15. Form around. The formation of the gas reservoir 38 is because the gas vent 35 is formed to open to the side of the gas release valve 15 so that the gas enters the float 34 from the lateral direction. For this reason, the gas separated from the liquid 5 is temporarily stored in the dissolution tank 2. The gas to be stored is returned to the lower end of the gas-liquid mixing tank 6 through the gas circulation path 14 and circulated. Thus, the gas dissolving apparatus 1 can also reliably circulate undissolved gas via the gas circulation path 14. A decrease in the gas-liquid ratio of the generated liquid 5 can be suppressed.

  When the liquid level 33 is lowered, it moves downward in the float chamber 36 so that the float 34 sinks, and the gas flows into the gas release valve 15 through the gas vent 35 and escapes from the gas outlet 37 to the outside of the dissolution tank 2. Released. Such gas release can be performed periodically in the gas dissolving device 1, and the gas flow rate to be supplied varies, so that even if an excessive amount of gas is introduced, the undissolved gas flows out of the liquid 5. At the same time, it is possible to suppress the outflow from the dissolution tank 2 to the outside.

  The upper wall portion 2a of the dissolution tank 2 corresponding to the upper end portion of the large bubble outflow prevention tank 7 may be an inclined surface, similar to the portion corresponding to the upper end portion of the gas-liquid separation tank 8, It may be a horizontal plane. When the upper wall portion 2a of the dissolution tank 2 corresponding to the upper end portion of the large bubble outflow prevention tank 7 is also an inclined surface, the gas can be taken out by providing the gas outlet 32 in a portion having the highest inclination as much as possible. 32 is preferable because it is easy to collect.

DESCRIPTION OF SYMBOLS 1 Gas dissolution apparatus 2 Dissolution tank 2a Upper wall part 2c Inclined surface part 3 1st partition wall 4 2nd partition wall 5 Liquid 6 Gas-liquid mixing tank 7 Large bubble outflow prevention tank 8 Gas-liquid separation tank 14 Gas circulation path 14a One end part 15 Gas release valve 16 Boundary portion 32 Gas outlet 33 Liquid level 34 Float 35 Gas outlet

Claims (2)

The interior is partitioned by the two partition walls of the first partition wall and the second partition wall from the upstream side to the downstream side with respect to the liquid flow in the order of a gas-liquid mixing tank, a large bubble outflow prevention tank, and a gas-liquid separation tank, A gas-liquid separation tank and a large bubble outflow prevention tank are provided with a dissolution tank communicating with each other in the upper part, and the liquid flowing into the dissolution tank is mixed with the gas in the gas-liquid mixing tank to generate a liquid in which the gas is dissolved. The liquid is a gas dissolving device that sequentially flows through the large bubble outflow prevention 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,
A portion corresponding to the upper end portion of the gas-liquid separation tank in the upper wall portion of the dissolution tank is an inclined surface portion, and the inclined surface portion is a dissolution tank facing the boundary portion from the boundary portion between the gas-liquid separation tank and the large bubble outflow prevention tank. Inclined obliquely downward toward the edge of the upper wall,
A gas outlet is formed in the upper wall of the dissolution tank corresponding to the upper end of the large bubble spill prevention tank, and once the gas stored in the dissolution tank is taken out, it is returned to the dissolution tank for circulation. One end of the path is connected to the gas outlet port.   It has a float that floats and sinks following the liquid level in the gas-liquid separation tank and can move in the vertical direction. The float moves up and down as the liquid level changes. A gas release valve for releasing and stopping the gas stored in the tank is provided on the inclined surface of the dissolution tank, and the gas release valve is vented so that the gas in the dissolution tank enters from the side with respect to the float. The gas dissolving apparatus according to claim 1, wherein a mouth is formed.

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