WO2017217157A1 - 気体溶解装置 - Google Patents

気体溶解装置 Download PDF

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Publication number
WO2017217157A1
WO2017217157A1 PCT/JP2017/018005 JP2017018005W WO2017217157A1 WO 2017217157 A1 WO2017217157 A1 WO 2017217157A1 JP 2017018005 W JP2017018005 W JP 2017018005W WO 2017217157 A1 WO2017217157 A1 WO 2017217157A1
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WO
WIPO (PCT)
Prior art keywords
gas
liquid
float chamber
dissolution
flow path
Prior art date
Application number
PCT/JP2017/018005
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English (en)
French (fr)
Japanese (ja)
Inventor
前田　康成
伊藤　良泰
一成 川原
Original Assignee
パナソニックＩｐマネジメント株式会社
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Publication of WO2017217157A1 publication Critical patent/WO2017217157A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/7176—Feed mechanisms characterised by the means for feeding the components to the mixer using pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D19/00—Degasification of liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F21/00—Dissolving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/71—Feed mechanisms
    • B01F35/712—Feed mechanisms for feeding fluids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/75—Discharge mechanisms
    • B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
    • B01F35/7547—Discharge mechanisms characterised by the means for discharging the components from the mixer using valves, gates, orifices or openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/18—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float

Definitions

  • the present invention relates to a gas dissolving apparatus.
  • a conventional gas dissolving apparatus includes a gas dissolving apparatus that mixes a gas and a liquid to dissolve the gas into the liquid (for example, Patent Document 1).
  • the gas dissolving device of Patent Document 1 includes a dissolution tank for dissolving a gas into a liquid.
  • the inside of the dissolution tank is partitioned into a plurality of spaces, and a liquid in which the gas is dissolved is generated in the process in which the gas-liquid mixed fluid in which the liquid and the gas are mixed flows in these spaces.
  • the gas dissolving device of Patent Document 1 is provided with a float chamber for discharging undissolved gas in the dissolving tank to the outside.
  • an object of the present invention is to provide a gas dissolving apparatus with improved reliability in solving the above-mentioned problems.
  • a gas dissolving apparatus includes an inlet for introducing a gas-liquid mixed fluid obtained by mixing a gas with a liquid, and a flow path for the gas-liquid mixed fluid flowing from the inlet.
  • a dissolution tank having a dissolution channel for dissolving the gas in the gas, and an outflow port for allowing the liquid in which the gas is dissolved to flow out of the dissolution channel, and a gas-liquid mixed fluid flowing into the dissolution tank.
  • An inflow path An outflow path connected to the outflow port for discharging a liquid in which gas is dissolved, and a float chamber for discharging undissolved gas in the dissolution flow path to the outside, communicating with the dissolution flow path And the dissolution flow path at a location different from the communication location where the float chamber communicates with the dissolution flow path, or the bypass flow path connecting the inflow path or the outflow path and the float chamber.
  • the reliability can be improved.
  • FIG. 9 is a longitudinal sectional view of a dissolving tank of the gas dissolving apparatus according to the embodiment (cross section taken along the line AA in FIG. 9).
  • FIG. 10 is a longitudinal sectional view of a dissolution tank of the gas dissolving apparatus according to the embodiment (a sectional view taken along line BB in FIG. 10).
  • FIG. 1 is a diagram illustrating a schematic configuration of a gas dissolving apparatus 2 according to the first embodiment.
  • the gas dissolving device 2 generates a fine bubble by decompressing a gas dissolved in a liquid using a decompression device 14 described later, and supplies a liquid containing the fine bubble to a bathtub or the like.
  • the gas dissolving apparatus 2 of Embodiment 1 includes an inflow path 4, a gas supply mechanism 6, a pump 8, a dissolution tank 10, an outflow path 12, a decompression device 14, and a float chamber 16. And a bypass channel 18.
  • a gas-liquid mixed fluid in which a liquid and a gas are mixed flows into the dissolution tank 10 from the inflow path 4, and the gas is dissolved in the liquid in the dissolution tank 10. Thereafter, the liquid in which the gas is dissolved flows out to the outflow passage 12 and is generated as fine bubbles by reducing the pressure by the decompression device 14.
  • undissolved gas that has not been dissolved in the liquid is stored in the float chamber 16 and is discharged to the outside of the dissolution tank 10.
  • a bypass flow path 18 for flowing a fluid into the float chamber 16 is provided.
  • the mixed fluid is allowed to flow in the float chamber 16 where a fluid flow does not normally occur, and the inside of the float chamber 16 can be cleaned.
  • each structure of the gas dissolving apparatus 2 is demonstrated in order.
  • the inflow path 4 is a flow path for allowing the gas-liquid mixed fluid to flow into the dissolution tank 10.
  • the inflow path 4 is constituted by a pipe, for example.
  • the upstream side of the inflow path 4 is connected to a liquid supply source (not shown), and is configured to be able to supply liquid into the inflow path 4.
  • the downstream side of the inflow path 4 is connected to the inlet 20 of the dissolution tank 10.
  • a gas supply mechanism 6 and a pump 8 are provided in the middle of the inflow path 4.
  • the gas supply mechanism 6 is a mechanism for supplying gas into the inflow path 4.
  • the gas supply mechanism 6 is configured to include, for example, a pipe or the like. In the first embodiment, the configuration of the gas supply mechanism 6 will be described in a simplified manner.
  • the gas supply mechanism 6 supplies gas into the inflow passage 4 to generate a gas-liquid mixed fluid in which liquid and gas are mixed.
  • the pump 8 is a pump provided on the downstream side of the gas supply mechanism 6.
  • the pump 8 pumps the gas-liquid mixed fluid in the inflow passage 4 toward the inlet 20 of the dissolution tank 10.
  • the operation of the pump 8 is controlled by a control device described later.
  • the flow rate of the gas-liquid mixed fluid supplied to the dissolution tank 10 can be adjusted by controlling the rotation speed of the pump 8.
  • the dissolution tank 10 is a container for storing the gas-liquid mixed fluid supplied from the inflow passage 4 and dissolving the gas in the liquid.
  • the dissolution tank 10 has the inflow port 20, the dissolution flow path 22, and the outflow port 24 described above.
  • the dissolution channel 22 is a channel for flowing the gas-liquid mixed fluid that has flowed in from the inlet 20, and is formed by the inner wall of the dissolution tank 10.
  • the dissolution channel 22 is composed of a plurality of spaces, and a detailed configuration will be described later.
  • the upstream end of the dissolution channel 22 starts at the inlet 20 and the downstream end of the dissolution channel 22 ends at the outlet 24.
  • the outlet 24 is an outlet for allowing the liquid in which the gas is dissolved in the dissolution channel 22 to flow out of the dissolution tank 10. Both the inlet 20 and the outlet 24 are formed as openings at the bottom of the dissolution tank 10.
  • the outflow path 12 is a flow path for flowing out the fluid from the dissolution tank 10 to a bathtub or the like.
  • the outflow path 12 is constituted by, for example, piping.
  • the upstream end of the outflow path 12 is connected to the outlet 24 of the dissolution tank 10, and the downstream end is connected to a bathtub or the like.
  • a decompression device 14 is provided at a position adjacent to the outlet 24 in the outflow passage 12.
  • the decompression device 14 is a device that decompresses the liquid flowing out from the outlet 24 of the dissolution tank 10. When the decompression device 14 decompresses the liquid, the gas dissolved in the liquid can be generated as fine bubbles in the outflow passage 12.
  • the decompression device 14 and the outflow path 12 constitute a miniaturization unit that microbubbles the gas dissolved in the liquid.
  • the float chamber 16 is a mechanism for discharging undissolved gas that has not been dissolved in the liquid in the dissolution tank 10 to the outside.
  • the float chamber 16 is attached to the upper part of the dissolution tank 10 so as to communicate with the dissolution flow path 22 in the dissolution tank 10.
  • the float chamber 16 is preferably communicated with the downstream side of the dissolution channel 22 in the dissolution tank 10.
  • the float chamber 16 is provided so as to communicate with the most downstream space (a gas-liquid separation chamber 40 described later) in the dissolution tank 10.
  • the float chamber 16 includes a float 26, a valve body 28, and a discharge port 30.
  • the float 26 is a member that floats on the liquid level in the float chamber 16.
  • the float 26 moves up and down according to the height (water level) of the liquid level in the float chamber 16.
  • the float 26 is connected to the valve body 28.
  • the valve body 28 is a member which closes the discharge port 30 so that opening and closing is possible.
  • the discharge port 30 is an opening for discharging the gas in the float chamber 16 to the outside.
  • the discharge port 30 is provided on the upper surface of the float chamber 16 and communicates the inside and the outside of the float chamber 16.
  • the outlet 30 when the water level in the float chamber 16 is higher than the predetermined water level, the outlet 30 is closed by the valve body 28, and when the water level in the float chamber 16 is lower than the predetermined water level, the discharge port 30 is discharged. It functions to open the outlet 30. Detailed functions of the float chamber 16 will be described later.
  • the bypass channel 18 is a channel for supplying a fluid into the float chamber 16.
  • the bypass flow path 18 forms a fluid flow in the float chamber 16 to prevent the float chamber 16 from being contaminated or to clean the adhered dirt.
  • the bypass channel 18 in the first embodiment is provided so as to communicate the side wall of the float chamber 16 with the outer wall of the dissolution tank 10 on the upstream side of the float chamber 16.
  • a location where the float chamber 16 and the bypass channel 18 are connected is a communication location where the float chamber 16 communicates with the dissolution tank 10 (a bottom wall opening (not shown) of the float chamber 16). Is another part.
  • the bypass flow path 18 is connected so as to communicate with the most upstream space (gas-liquid mixing chamber 36 described later) in the dissolution tank 10.
  • the dissolution tank 10 has an internal space partitioned by a plurality of walls.
  • the dissolution tank 10 in the first embodiment includes two partition walls 32 and 34.
  • the first partition wall 32 is a wall extending downward from the upper end portion of the inner wall of the dissolution tank 10.
  • the first partition wall 32 does not reach the lower end portion of the inner wall of the dissolution tank 10 and forms a first communication port 33 as a gap with the lower end portion of the inner wall.
  • the second partition wall 34 is a wall extending upward from the lower end portion of the inner wall of the dissolution tank 10.
  • the second partition wall 34 does not reach the upper end of the inner wall of the dissolution tank 10, and forms a second communication port 35 as a gap with the upper end of the inner wall.
  • a dissolution channel 22 is formed by the space.
  • a space (intermediate chamber 38) between them and a space (gas-liquid separation chamber 40) on the downstream side of the second partition wall 34 are partitioned.
  • the upstream end of the gas-liquid mixing chamber 36 is connected to the inlet 20, and the downstream end of the gas-liquid separation chamber 40 is connected to the outlet 24. Further, the upstream end portion of the bypass channel 18 is connected to the gas-liquid mixing chamber 36, and the float chamber 16 communicates with the gas-liquid separation chamber 40.
  • a gas-liquid mixed fluid in which liquid and gas are mixed is supplied to the dissolution tank 10.
  • the gas-liquid mixed fluid enters the gas-liquid mixing chamber 36 through the inlet 20.
  • the gas-liquid mixed fluid that has entered the gas-liquid mixing chamber 36 is ejected upward from the bottom of the inner wall of the dissolution tank 10.
  • the gas-liquid mixed fluid collides with the upper end of the inner wall of the dissolution tank 10 and the first partition wall 32 and rebounds.
  • the gas-liquid mixed fluid that collides with the upper end of the inner wall of the dissolution tank 10 and the first partition wall 32 and rebounds stirs the gas-liquid mixed fluid in the gas-liquid mixing chamber 36.
  • the gas mixed through the gas supply mechanism 6 and the gas previously stored in the gas-liquid mixing chamber 36 are vigorously mixed with the liquid as the solvent.
  • the gas-liquid mixed fluid is stirred, and the gas is dissolved in the liquid under pressure, whereby a liquid in which the gas is dissolved is generated.
  • Such dissolution of gas is promoted by shearing by stirring to subdivide the gas mixed as gas bubbles in the gas-liquid mixed fluid and increase the surface area in contact with the liquid.
  • the homogenization by stirring reduces the gas dissolution concentration in the vicinity of the liquid surface, which is also promoted by increasing the gas dissolution rate in the liquid.
  • the generated gas-liquid mixed fluid flows out into the intermediate chamber 38 through the first communication port 33 between the lower end of the first partition wall 32 and the bottom of the inner wall of the dissolution tank 10.
  • the liquid flowing out into the intermediate chamber 38 flows from the upper end of the second partition wall 34 through the second communication port 35 and out into the gas-liquid separation chamber 40.
  • the gas-liquid separation chamber 40 is a space that separates gas that cannot be dissolved in the liquid from the liquid as bubbles. Since the liquid flow is lifted up to the vicinity of the liquid surface, which is the gas-liquid interface, the bubbles move upward by buoyancy and flow into the float chamber 16.
  • the liquid flowing out into the gas-liquid separation chamber 40 flows out into the outflow path 12 through the outflow port 24. Since the outflow port 24 is provided at the bottom of the gas-liquid separation chamber 40, outflow of large bubbles existing near the liquid surface to the outside is prevented.
  • the gas flowing into the float chamber 16 accumulates in the space inside the float chamber 16.
  • the amount of gas accumulated in the float chamber 16 increases, and the liquid level in the float chamber 16 decreases accordingly.
  • the float 26 also descends.
  • the valve body 28 connected to the float 26 switches between opening and closing of the discharge port 30 according to the height position of the float 26. Specifically, when the water level in the float chamber 16 is high and the position of the float 26 is above a predetermined position, the valve body 28 closes the discharge port 30. On the other hand, when the water level in the float chamber 16 becomes low and the position of the float 26 is below the predetermined position, the valve body 28 opens the discharge port 30.
  • the gas is controlled not to be discharged through the drain port 30 but to be accumulated.
  • gas accumulates in the float chamber 16, and when the water level in the float chamber 16 falls, the float 26 also descends.
  • the valve body 28 opens the discharge port 30. Thereby, the gas is discharged through the discharge port 30.
  • the discharge port 30 is closed again.
  • a bypass flow path 18 that connects the float chamber 16 and the space (gas-liquid mixing chamber 36) in the dissolution tank 10 is provided so that the gas-liquid mixed fluid can flow into the float chamber 16.
  • the bypass flow path 18 is not provided, the liquid flow basically does not occur in the float chamber 16 although the liquid level moves up and down. For this reason, the inside of the float chamber 16 tends to accumulate dirt. For example, when the bacteria in the liquid die and become a jelly-like lump adheres to the side wall of the float chamber 16 or the float 26, the operation of the float 26 is hindered. There is.
  • the gas dissolving device 2 when used for supplying a liquid to the “bathtub”, an additive such as oil may be added to the liquid. It becomes easy to get dirty.
  • the bypass flow path 18 is provided so that the gas-liquid mixed fluid flows into the float chamber 16. Thereby, the gas-liquid mixed fluid can be flowed into the float chamber 16 to clean the inside of the float chamber 16, and the float 26 can be prevented from malfunctioning due to dirt on the wall surface in the float chamber 16, etc. The reliability of the gas dissolving device 2 can be improved.
  • the bypass flow path 18 is connected to the gas-liquid mixing chamber 36 which is the most upstream space in the dissolution tank 10. For this reason, by utilizing the pressure difference between the gas-liquid mixing chamber 36 and the float chamber 16, the gas-liquid mixed fluid having a high pressure on the upstream side can be flowed into the float chamber 16, and a strong flow is generated in the float chamber 16. Can be generated. Thereby, the detergency which cleans the float chamber 16 improves and the reliability of the gas dissolving apparatus 2 can be improved.
  • the float chamber 16 communicates with the gas-liquid separation chamber 40 which is the most downstream space in the dissolution tank 10. For this reason, the pressure difference of the fluid tends to occur between the upstream side and the downstream side in the bypass flow path 18, and the gas-liquid mixed fluid can flow more reliably to the float chamber 16.
  • bypass channel 18 connects the gas-liquid mixing chamber 36 and the float chamber 16
  • the present invention is not limited to such a case.
  • the bypass flow path 52 in the gas dissolving device 50 shown in FIG. 2 is provided so as to communicate the float chamber 16 and the gas-liquid separation chamber 40.
  • the bypass passage 52 communicates with the gas-liquid separation chamber 40 at a point downstream of the communication location (the bottom wall opening of the float chamber 16) where the float chamber 16 and the gas-liquid separation chamber 40 communicate. Connected to do.
  • the gas-liquid mixed fluid is caused to flow from the high-pressure float chamber 16 to the low-pressure gas-liquid separation chamber 40 using the pressure difference between the float chamber 16 and the gas-liquid separation chamber 40. Can do. Thereby, the flow of the gas-liquid mixed fluid is generated in the float chamber 16 and the inside of the float chamber 16 can be cleaned.
  • the float chamber 16 is on the low pressure side in the bypass flow path 18, and the space (gas-liquid mixing chamber 36) in the dissolution tank 10 is on the high pressure side. Therefore, the fluid is always supplied to the float chamber 16 through the bypass channel 18, and the float chamber 16 can always be cleaned. Further, since the high-pressure side of the bypass channel 18 is connected to the gas-liquid mixing chamber 36, a gas-liquid mixed fluid containing a large amount of bubbles is supplied to the float chamber 16 from the gas-liquid mixing chamber 36 where the gas and the liquid are intensively mixed. Is done.
  • the float chamber 16 in the bypass channel 52 is on the high pressure side, and the space (gas-liquid separation chamber 40) in the dissolution tank 10 is on the low pressure side. Therefore, the fluid flows into the bypass channel 52 only when the water level rises to the height position of the bypass channel 52 in the float chamber 16. As described above, the float chamber 16 is not always washed, and the liquid flowing through the bypass passage 52 contains almost no bubbles.
  • the bypass flow paths 18 and 52 are the most upstream space (gas-liquid mixing chamber 36) or the most downstream space (of the plurality of spaces in the dissolution tank 10 ( The gas-liquid separation chamber 40) and the float chamber 16 are connected. According to such a configuration, a pressure difference is easily generated in the fluid flowing in the bypass flow paths 18 and 52, and a strong flow can be generated in the float chamber 16. Thereby, the detergency which cleans the float chamber 16 improves, and the reliability of the gas dissolving apparatuses 2 and 50 can be improved.
  • Embodiment 1 and the modification demonstrated the case where the bypass flow paths 18 and 52 were connected with the gas-liquid mixing chamber 36 and the gas-liquid separation chamber 40, respectively, it is not restricted to such a case.
  • the float chamber 16 may be connected to an arbitrary position as long as it is a location different from the communication location where the float chamber 16 and the dissolution channel 22 communicate with each other. As a result, a pressure difference is generated between the upstream side and the downstream side of the bypass flow paths 18 and 52, so that the fluid can flow through the bypass flow paths 18 and 52 and the float chamber 16 can be washed.
  • Embodiment 2 Next, the gas dissolving apparatus 60 concerning Embodiment 2 is demonstrated using FIG.
  • the bypass flow paths 18 and 52 are provided so as to connect the float chamber 16 and the space in the dissolution tank 10, but in the second embodiment, not the space in the dissolution tank 10 but the inflow path. 4 is connected to the bypass flow path 62.
  • the difference from the first embodiment will be mainly described.
  • the gas dissolving device 60 includes a bypass channel 62 that connects the inflow channel 4 and the float chamber 16.
  • the upstream side of the bypass channel 62 is connected to a position on the downstream side of the pump 8 in the inflow channel 4.
  • the downstream side of the bypass flow path 62 is connected to the side wall of the float chamber 16 as in the first embodiment.
  • the gas dissolving device 60 further includes an on-off valve 64 and a check valve 66 as a configuration provided in the middle of the bypass flow path 62.
  • the gas dissolving device 60 further includes a control device 68 and a switch 69.
  • the on / off valve 64 is a valve (bypass channel on / off valve) that switches between opening and closing of the bypass channel 62.
  • the on-off valve 64 for example, an electromagnetic valve or an electric valve is used.
  • a check valve 66 is provided on the downstream side of the on-off valve 64 in the bypass passage 62.
  • the check valve 66 is a valve that prevents a back flow in the bypass flow path 62, and acts to flow the gas-liquid mixed fluid only in the direction of flowing from the inflow path 4 toward the float chamber 16.
  • the control device 68 is a device for controlling the operation of the on-off valve 64 and the pump 8.
  • the control device 68 is constituted by a microcomputer, for example.
  • a switch 69 is connected to the control device 68.
  • the switch 69 is a member for the user to operate ON / OFF of the operation of the gas dissolving device 60.
  • FIG. 4 shows an example of a method for controlling the pump 8 and the on-off valve 64 by the control device 68 in such a configuration.
  • the operation of the pump 8 is started in response to the ON signal of the gas dissolving device 60 being input by the switch 69. Specifically, the pump 8 is operated so as to increase the rotational speed to a predetermined rotational speed, and thereafter controlled to be maintained at the predetermined rotational speed (first operation). During this time, the on-off valve 64 is closed. That is, the gas-liquid mixed fluid is controlled to flow only from the inflow path 4 to the dissolution tank 10 without flowing the gas-liquid mixed fluid through the bypass channel 62.
  • the float chamber 16 is not washed until the input of the OFF signal of the gas dissolving device 2 by the switch 69 is received, and the gas is dissolved in the liquid by the dissolving tank 10 and fine bubbles are generated by the decompression device 14 and the outflow passage 12.
  • the 1st operation which generates is performed.
  • control is performed so that the rotational speed of the pump 8 is gradually increased as time passes. Thereby, the pump 8 is controlled so as not to take in a large amount of gas abruptly.
  • the control device 68 stops the operation of the pump 8. Specifically, the operation is performed until the pump 8 is stopped while the rotational speed of the pump 8 is decreased (second operation).
  • the on-off valve 64 is controlled to open during the second operation. That is, the float chamber 16 is cleaned immediately before the operation of the gas dissolving device 60 is completed. According to such control, in the first operation in which fine bubbles are generated, the gas-liquid mixed fluid is not supplied to the float chamber 16, and the rotation speed of the pump 8 is reduced in the second operation after the first operation. Wash while you are.
  • the gas-liquid mixed fluid having a desired flow rate is supplied to the dissolution tank 10, and the float chamber 16 that does not affect the first operation according to the end of the first operation is supplied. Washing can be performed. In this way, the first operation for generating fine bubbles and the second operation for cleaning the float chamber 16 can be efficiently made compatible.
  • the gas is compressed and the pressure of the liquid is high.
  • the rotation speed of the pump 8 is rapidly decreased in the second operation, the dissolution tank 10 The gas expands rapidly. In this case, gas may flow into the outflow passage 12 instead of the float chamber 16.
  • control is performed such that the rotational speed of the pump 8 is gradually decreased with the passage of time. This prevents the above-described phenomenon from occurring.
  • the decrease speed of the rotation speed of the pump 8 in the second operation is controlled slower than the increase speed of the rotation speed of the pump 8 at the start of the first operation. Thereby, the phenomenon mentioned above can be prevented more effectively.
  • the gas dissolving apparatus 60 includes the on-off valve (bypass passage on-off valve) 64 that opens and closes the bypass passage 62. As a result, it is possible to control the fluid to flow through the bypass channel 62 when desired.
  • the pump 8 is operated in a first operation that is operated at a predetermined rotational speed, and in the second operation until the pump 8 is stopped while decreasing the rotational speed of the pump 8 from the first operation. It is controlled to execute the operation.
  • the on-off valve 64 is controlled to open during the second operation of the pump 8.
  • the bypass flow path 62 connects the float chamber 16 and a position downstream of the pump 8 in the inflow path 4.
  • Embodiment 3 Next, the gas dissolving apparatus 70 concerning Embodiment 3 is demonstrated using FIG.
  • a gas supply path 72, an on-off valve 74, and a check valve 76 are provided. Since other configurations are the same as those of the second embodiment, description thereof is omitted.
  • the gas supply path 72 is a gas flow path for supplying gas to the inflow path 4.
  • the gas supply path 72 is constituted by, for example, a pipe.
  • the upstream side of the gas supply path 72 is connected to a gas supply source (not shown), and the downstream side of the gas supply path 72 is connected to the inflow path 4.
  • the gas supply path 72 is connected to the inflow path 4 at a position upstream of the pump 8.
  • An opening / closing valve 74 and a check valve 76 are provided in the middle of the gas supply path 72.
  • the on / off valve 74 is a valve (gas supply path on / off valve) that switches between opening and closing of the gas supply path 72.
  • As the on-off valve 74 for example, an electromagnetic valve or an electric valve is used.
  • a check valve 76 is provided upstream of the on-off valve 74 in the gas supply path 72.
  • the check valve 76 is a valve that prevents a back flow in the gas supply path 72, and acts to flow the gas only in the direction of flowing from the gas supply source toward the inflow path 4.
  • control device 68 controls the on-off valve 74 in addition to the pump 8 and the on-off valve 64.
  • An example of a method for controlling the pump 8, the on-off valve 64, and the on-off valve 74 by the control device 68 is shown in FIG.
  • the control method shown in FIG. 6 is common to the second embodiment with respect to the control of the pump 8 and the on-off valve 64, and only the control of the on-off valve 74 is different from the second embodiment. Hereinafter, the difference will be mainly described.
  • the control device 68 controls to open the on-off valve 74 during the first operation.
  • the on-off valve 74 is controlled to be closed during the second operation. That is, in the first operation, which is an operation for generating fine bubbles, gas is supplied to the inflow passage 4 to generate a gas-liquid mixed fluid.
  • the second operation for cleaning the float chamber 16 only the liquid is mainly supplied to the bypass channel 62 without supplying the gas to the inflow channel 4.
  • the gas-liquid mixed fluid containing a desired amount of gas is supplied to the dissolution tank 10 during the first operation, and the gas is not supplied to the inflow passage 4 during the second operation.
  • the gas dissolving apparatus 70 is a gas supply path 72 that supplies gas to a position upstream of the pump 8 in the inflow path 4 and an open / close valve that opens and closes the gas supply path 72. And a valve (gas supply passage opening / closing valve) 74.
  • the on-off valve 74 is controlled so that the pump 8 opens during the first operation and closes during the second operation. According to such control, while the gas is mixed and the gas-liquid mixed fluid is supplied in the first operation, the output by the pump 8 can be increased by not mixing the gas in the second operation, and the bypass A stronger flow can be generated through the channel 62. Thereby, the detergency which cleans the float chamber 16 improves, and the reliability of the gas dissolving apparatus 70 can be improved.
  • bypass flow path 62 is connected to the inflow path 4
  • the present invention is not limited to this case, and the outflow path 12 may be connected. Even in such a case, a pressure difference is generated between the upstream side and the downstream side of the bypass flow path, so that the fluid can flow through the bypass flow path and the float chamber 16 can be washed.
  • Embodiment 1-3 in order to form a bypass flow path that generates a flow of fluid in the float chamber 16, as in Embodiment 1, a communication location where the float chamber 16 and the dissolution flow path 22 communicate with each other.
  • the dissolution channel 22 and the float chamber 16 may be connected at a different location.
  • the inflow path 4 and the float chamber 16 may be connected as in the second and third embodiments, or the outflow path 12 and the float chamber 16 may be connected.
  • FIGS. 7 to 11 are examples based on the first embodiment described above.
  • 7 and 8 are partially exploded perspective views (front side and back side) of the dissolution tank 10
  • FIG. 9 is a plan view of the dissolution tank 10.
  • 10 is a cross-sectional view taken along the line AA in FIG. 9, and
  • FIG. 11 is a cross-sectional view taken along the line BB in FIG.
  • the float chamber 16 is provided on the upper surface of the outer wall of the dissolution tank 10, and the contact wall 78 is provided so as to contact the side wall of the float chamber 16. .
  • the contact wall 78 is a part of the outer wall upper surface 79 that forms the gas-liquid mixing chamber 36 in the dissolution tank 10.
  • the intermediate chamber 38 in the dissolution tank 10 is provided at a position different from the AA cross section of FIG. 9, it is not shown in FIG. 10, and the gas-liquid mixing chamber 36 and the gas-liquid separation chamber 40 are not shown. Only is shown.
  • a through-hole penetrating the float chamber 16 and the contact wall 78 is provided.
  • the through hole penetrates the float chamber 16 and the side wall of the contact wall 78 in the lateral direction (through the contact wall 78, the float chamber 16 and the gas-liquid mixing chamber 36 are communicated).
  • a path 18 is formed.
  • a temporary liquid level 80 in the float chamber 16 is illustrated, and the bypass channel 18 is provided in the vicinity of the liquid level 80.
  • the outer wall (outer wall upper surface 79) of the dissolving tank 10 constituting the most upstream space (gas-liquid mixing chamber 36) in the dissolving tank 10 is in contact with the float chamber 16. It has a wall 78. Further, the bypass channel 18 is formed by a through hole that communicates the contact wall 78 and the float chamber 16. In this way, the bypass channel 18 can be formed without providing other parts such as piping by forming the bypass channel 18 by the through-hole communicating with the contact wall 78 and the float chamber 16, and thus a simple configuration is adopted. Thus, the manufacturing cost of the gas dissolving device 2 can be reduced.
  • the present invention has been described with reference to the above-described embodiment 1-3 and examples, the present invention is not limited to the above-described embodiment 1-3.
  • Embodiment 1-3 the case where the bypass channel is connected to the side wall portion of the float chamber 16 has been described, but the present invention is not limited to such a case.
  • the bypass channel may be connected to an arbitrary position. In the float chamber 16, dirt is most likely to adhere to the vicinity of the liquid surface 80. Therefore, by connecting a bypass channel to the side wall of the float chamber 16 and ejecting fluid near the liquid surface 80. The inside of the float chamber 16 can be cleaned more efficiently.
  • the internal space of the dissolution tank 10 is partitioned by two partition walls 32 and 34, and the dissolution flow path 22 has three spaces (gas-liquid mixing chamber 36, intermediate chamber 38, and gas-liquid separation chamber 40).
  • the present invention is not limited to such a case. Any structure may be adopted as long as the gas can be dissolved in the liquid in the dissolution flow path 22 of the dissolution tank 10.
  • Embodiment 1-3 the case where the float chamber 16 is provided so as to communicate with the gas-liquid separation chamber 40 which is the most downstream space of the dissolution tank 10 has been described. It may be provided at an arbitrary position as long as it is downstream of the mixing chamber 36.
  • the gas dissolving apparatus can be applied to an application for generating a liquid in which a gas is dissolved and supplying the liquid without generating fine bubbles.
  • a gas dissolving device can be used as a means for generating a cleaning liquid for cleaning an object or as a means for generating a liquid used for health use.
  • the present invention is applicable to any gas dissolving apparatus that dissolves gas into liquid.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Accessories For Mixers (AREA)
  • Float Valves (AREA)
  • Degasification And Air Bubble Elimination (AREA)
PCT/JP2017/018005 2016-06-13 2017-05-12 気体溶解装置 WO2017217157A1 (ja)

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CN112237856A (zh) * 2019-07-19 2021-01-19 株式会社荏原制作所 气体溶解液制造装置

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