JP2009072663A - Gas-liquid pressurization dissolution mixer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas-liquid pressurization dissolution mixer allowing a cost reduction. <P>SOLUTION: The gas-liquid pressurization dissolution mixer 3 is composed of the upper passage 3A having an introduction inlet for introduction of a water/gas mixed flow and carrying out gas-liquid dissolution within the passage, the lower passage 3B arranged below the upper passage 3A at a specified interval, storing the pressurized liquid containing the dissolved gas and liquid and having a taking out opening for taking the pressurized liquid out of the passage and a falling passage 3C falling from the rear end of the upper passage 3A and communicating vertically with the passages 3A and 3B. The passages 3A, 3B and 3C are formed by cutting a square pipe each with a specified length. The rear end of the upper passage 3A and the upper end of the falling passage 3C are joined by welding (joined surface W<SB>1</SB>), and the lower end of the falling passage 3C and the rear end of the lower passage 3B are joined by welding (joined surface W<SB>2</SB>). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gas-liquid pressure-dissolution mixer that performs gas-liquid dissolution under pressure, and more particularly to a gas-liquid pressure-dissolution mixer that has a reduced bonding length to reduce costs.

  Conventionally, a gas-liquid dissolution mixer that dissolves a gas into a liquid has been used. For example, as shown in FIGS. 18 and 20 of the publication, Japanese Patent Laid-Open No. 9-173804 discloses a gas-liquid dissolution mixer, which has upper and lower passages that are vertically arranged with a partition wall therebetween. The upper passage is provided with a nozzle for supplying a liquid from the outside, and the lower passage is provided with an outlet for taking out the liquid to the outside.

  During operation, liquid is ejected from the nozzle into the upper passage, gas-liquid dissolution is performed under pressure, and then the liquid in which the gas is dissolved is taken out from the outlet of the lower passage.

  Each passage of the gas-liquid dissolution mixer is configured by, for example, bending and welding a sheet metal. FIG. 10 and FIG. 11 show a conventional gas-liquid dissolution mixer configured as described above. 10A is a side view of the gas-liquid dissolution mixer, FIG. 10B is a front view thereof, and FIG. 11 is a cross-sectional view thereof.

  As shown in these drawings, the gas-liquid dissolution mixer 100 is configured such that the sheet metals 101 and 102 are folded in a U-shape and overlapped vertically, and the lower edge of the sheet metal 101 is welded to the upper surface of the sheet metal 102. , 102, end plates 101e, 101f and 102e, 102f are respectively arranged on the front and rear ends, these end plates are welded to the sheet metals 101, 102, and a bottom plate 102g is disposed below the sheet metal 102. Is welded to the lower edge of the sheet metal 102.

An upper passage 101A and a lower passage 102A are formed by the sheet metal 101 and 102 bent in a U shape in this way. The end plate 101e is provided with a liquid supply nozzle 101c, and the end plate 102e is provided with a liquid outflow outlet 102c. An opening 102a is perforated on the upper surface of the sheet metal 102, and the upper passage 101A and the lower passage 102A communicate with each other through the opening 102a.
JP-A-9-173804 (see FIGS. 18 and 20)

  The conventional gas-liquid dissolution mixer is composed of sheet metal, and therefore, for example, the sheet metals 101 and 102 need to be welded in the longitudinal direction, and therefore, the weld length (weld circumference) becomes long, Productivity was poor and cost was high.

  The problem to be solved by the present invention is to provide a gas-liquid pressure-dissolution mixer that can reduce costs.

  The gas-liquid pressure-dissolution mixer according to the invention of claim 1 has an introduction port through which at least a liquid is introduced from the outside, a first passage in which gas-liquid dissolution is performed, and a lower portion of the first passage And a rear end of the first passage, the second passage having an outlet to the outside of the pressurized liquid and storing the pressurized liquid dissolved in the gas-liquid state. And a third passage that communicates the first and second passages in the vertical direction, and the first, second, and third passages are each made of a hollow material, The rear end of the first passage and the upper end of the third passage, and the lower end of the third passage and the rear end of the second passage are joined.

  According to invention of Claim 1, the 1st, 2nd and 3rd channel | path is each comprised from the hollow material, Therefore The bending process for shape | molding each channel | path is unnecessary. In addition, a second passage is provided at a distance from the first passage, a third passage that communicates the first and second passages in the vertical direction is provided, a rear end of the first passage and a third passage Since the upper end of the passage and the lower end of the third passage and the rear end of the second passage are joined, it is not necessary to join the entire length of the first and second passages. The cost can be reduced.

  Conventionally, since the joining length was long, when joining by welding, it was necessary to increase the thickness of the sheet metal to some extent in order to prevent deformation of the sheet metal during welding. Since the joining length is shortened, it is possible to use a material having a thin plate thickness when joining by welding, thereby further reducing the cost.

  According to a second aspect of the present invention, in the first aspect, the first, second and third passages are arranged in a substantially U shape.

  According to a third aspect of the present invention, in the first or second aspect, a fourth passage extending upward for discharging excess gas is provided at the tip of the second passage.

  As described above, according to the gas-liquid pressure-dissolution mixer according to the present invention, the first, second and third passages are each composed of a hollow material, and are spaced apart from the first passage. 2 passages, a third passage that communicates the first and second passages in the vertical direction, a rear end of the first passage and an upper end of the third passage, and a lower end of the third passage and Since the rear ends of the second passages are joined, it is not necessary to join the entire lengths of the first and second passages, whereby the joining length can be shortened and the cost can be reduced.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 9C are views for explaining a gas-liquid pressure-dissolution mixer according to an embodiment of the present invention. FIG. 1 illustrates a microscopic structure to which the gas-liquid pressure-dissolution mixer according to the present embodiment is applied. FIG. 2 is a front view of a gas mixture pump and a gas-liquid pressure-dissolution mixer, FIG. 3 is a side view thereof, and FIG. 4 is a diagram for explaining the operation of the gas-liquid pressure-dissolution mixer. FIG. 5A is a side view of the gas-liquid pressure-dissolution mixer, FIG. 5B is a front view thereof, FIG. 6 is a cross-sectional view of the gas-liquid pressure-dissolution mixer, FIG. 7 and FIG. FIG. 9A is a diagram showing an example of material removal of each square pipe constituting the gas-liquid pressure-dissolution mixer, and FIG. 9B is a front view thereof, and FIG. 9C is a right side view thereof.

  As shown in FIG. 1, the microbubble manufacturing apparatus 1 sucks a liquid (here, water) and a gas (here, air) and discharges these mixed flows, and discharges from the mixture pump 2. Gas-liquid pressure dissolution mixer (mixing box) that dissolves and mixes air in water by introducing a bubble nucleus of microbubbles in water while introducing a mixed flow of water and air 3 and a shower head 4 connected to the gas-liquid pressure-dissolution mixer 3 and having a fixed throttle as a decompressor.

  A pipe 20 for sucking water and a pipe 21 for sucking air are connected to the suction side of the air-mixing pump 2 via a connector 22. A strainer 20 a is connected to the tip of the pipe 20. As the strainer 20a, from the viewpoint of maintainability, a strainer such as a disk strainer that can be easily cleaned from the outside without disassembling the pipe is preferable. The strainer 20a is immersed in a pet washing tank such as a dog bath or a bathtub. A filter 21a, a check valve 21b, and a throttle 21c are connected to the pipe 21 in order from the tip side. Here, the check valve 21b is provided to prevent the fluid from flowing back to the filter 21a side when the air-fuel mixture pump 2 is stopped. The restrictor 21c is provided to limit the amount of air that flows in.

  The gas-liquid pressure-dissolution mixer 3 includes an upper passage (first passage) 3A and a lower passage (second passage) 3B, which are arranged in the horizontal direction and opposed to each other with an interval in the vertical direction, It has a falling passage (third passage) 3C for connecting the upper and lower passages 3A, 3B, as well as falling downward from the rear end of the upper passage 3A. ing. In addition, a passage (fourth passage) 3D that extends upward is provided at the tip of the lower passage 3B.

  By forming the gas-liquid pressurization-dissolution mixer 3 in a substantially U-shape, as shown in FIG. 2 and FIG. By doing so, the whole apparatus can be reduced in size. At this time, the space 3S formed between the upper passage 3A, the lower passage 3B, and the falling passage 3C of the gas-liquid pressurization and dissolution mixer 3 is effectively used as a space for piping, thereby further increasing the entire apparatus. Can be downsized.

Between the tip of the upper passage 3A and the discharge side of the air mixture pump 2, a pipe 23 and a nozzle 23a for guiding the mixed flow of water and air discharged from the air mixture pump 2 to the upper passage 3A are disposed. A connector (introduction port) 23b is connected to the tip of the upper passage 3A. Nozzle 23a, the water and mixed flow a predetermined flow rate of air (preferably 5 to 15 m / s) is provided in order to flow into the upper channel 3A as jet (jet stream) W _A (see FIG. 4) . In FIG. 4, for convenience of illustration, a state in which the nozzle 23a is directly attached to the tip of the upper passage 3A is shown.

  At the tip of the lower passage 3 </ b> B of the gas-liquid pressure-dissolution mixer 3, a pipe 30 is connected to the connector ( It is connected via an outlet 30a (see FIG. 4). A shower head 4 is connected to the pipe 30. A drain pipe 31 is connected to the lower portion of the lower passage 3B via a connector 31a. The pipe 31 is for draining water remaining in the gas-liquid pressure-dissolution mixer 3 when the apparatus is not used.

  An exhaust pipe 33 is connected to the upper part of the upper passage 3A of the gas-liquid pressure-dissolution mixer 3 via a connector 33c (see FIG. 4). This pipe 33 is for extracting a gas to be expanded inside the gas-liquid pressurization and dissolution mixer 3 when the microbubble production apparatus 1 is stopped. A silencer 33 a is connected to the tip of the pipe 33. ing. An electromagnetic valve 33 b is provided in the middle of the pipe 33. The electromagnetic valve 33b and the air-mixing pump 2 are turned on (ON) by a control unit disposed in a region 200 (see FIG. 3) on the side of the gas-liquid pressurizing and dissolving mixer 3 above the air-mixing pump 2. And control of cutting (OFF) is performed. As shown in the figure, the electromagnetic valve 33b is, for example, a 2-port 2-position switching valve. In this case, when the power is turned on, the pipe is opened and the exhaust to the silencer 33a is performed. . Further, the “open” operation of the electromagnetic valve 33b is preferably interlocked with the OFF operation of the air-mixing pump 2. In other words, when the air-mixing pump 2 is turned on, the electromagnetic valve 33b is “closed” and the pipe line is closed.

As shown in FIG. 4, the mounting position of the nozzle 23a to the upper passage 3A of the gas-liquid pressure dissolution mixer 3, water jet W _A ejected from the nozzle 23a is the position interfering the water surface W _L in the upper channel 3A preferable. Thereby, in the upper channel | path 3A, water and air will be in a perfect mixing state, and gas-liquid melt | dissolution and the production | generation of a bubble nucleus will be performed efficiently.

Horizontal length L of the upper channel 3A is preferably the length of the jet water flow W _A from the nozzle 23a is not stall. The length L, the flow rate of the water jet W _A and u, when the mounting height of the nozzle 23a is h, calculated by the following equation.
L <0.45u√h

The horizontal length L ′ of the lower passage 3B is long enough that a large bubble that sinks to the bottom at the inlet (right end in FIG. 4) of the lower passage 3B can rise while moving to the left in the lower passage 3B. It only has to have. This length L ′ is obtained by the following equation, where w is the flow velocity in the lower passage 3B, v is the rising speed of the bubbles, and k is the height of the lower passage 3B.
L '> kw / v

  Since it has been experimentally confirmed that the vertical length of the falling passage 3C has little influence on the generation of bubbles, it may be any length.

  As for channel 3D, it is preferred that 50% or more of the whole pipe line projects upward. A connector 32b is connected to the upper part of the passage 3D. A pipe 32 is connected to the connector 32b via an air vent valve 32a for discharging surplus gas (excess air) in the gas-liquid pressurized dissolution mixer 3 (see FIG. 4).

  As shown in FIGS. 1 to 3, the reason why the exhaust pipe 33 is connected to the highest position of the gas-liquid pressure-dissolution mixer 3 is that air is easily extracted from above, If the pipe 33 is connected to a low position, the water inside the gas-liquid pressurization and dissolution mixer 3 continues to flow to the outside by the siphon principle after the apparatus is stopped depending on the installation state of the apparatus. It is to do.

  The shower head 4 is fixed by screws to a connection fitting fixed to the tip of the pipe 30. A fixed throttle (not shown) is interposed between the end of the shower head 4 and the connection fitting.

As shown in FIGS. 5 and 6, the gas-liquid pressure-dissolution mixer 3 is configured, for example, by joining rectangular pipes cut to a predetermined length by welding. That is, the square pipe portion constituting the upper passage 3A has one end cut in an oblique direction that forms 45 degrees with respect to the pipe center line (cut plane W ₁ ), and constitutes the lower passage 3B and the falling passage 3C, respectively. Each of the square pipe portions to be cut is cut in an oblique direction in which both ends form 45 degrees with respect to the pipe center line (cut surfaces W ₂ and W ₃ and cut surfaces W ₁ and W ₂ ). Also, square pipe portion constituting a passage 3D has one end cut in an oblique direction forming 45 degrees with respect to the pipe center line (cut surface W _3). Thus, by forming each passage using a square pipe, it is not necessary to bend the sheet metal.

Each cut surface W ₁ , W ₂ and W ₃ also represents a welded joint surface. That is, in this case, the rear end of the upper passage 3A and the upper end of the falling passage 3B, the lower end of the falling passage 3B and the rear end of the lower passage 3B, and the front end of the lower passage 3B and the lower end of the passage 3D are welded. It is joined.

  This eliminates the need for welding over the entire length of the upper and lower passages 3A, 3B, thereby reducing the welding length and reducing the cost.

  Conventionally, since the welding length was long, it was necessary to increase the thickness of the sheet metal to some extent in order to prevent deformation of the sheet metal during welding, but in this embodiment, the welding length is shortened. This makes it possible to use a material with a thin plate thickness. Thereby, cost can be further reduced.

  Here, an example of material removal of each square pipe when manufacturing the gas-liquid pressure dissolution mixer 3 will be described with reference to FIGS.

  First, as shown in FIG. 8, a single square pipe 50 is prepared, and this is cut into portions I, II, III, and IV in order from the end. At this time, the angle formed by the cut surface of each part with respect to the pipe center line is 45 degrees, −45 degrees, and 45 degrees as measured on the acute angle side. Separately from the square pipe 50, an end plate 3e to which the connector 23b is fixed and an end plate 3f to which the connector 32b is fixed are prepared.

Next, the portions I, II, III, and IV obtained by cutting the square pipe 50 are arranged as shown in FIG. 7, and the mating surfaces W ₁ , W _2, and W ₃ of the adjacent portions are arranged. Join by welding. Thereby, each part I, II, III, IV comprises the upper channel | path 3A, the falling channel | path 3C, the lower channel | path 3B, and the channel | path 3D, respectively. Further, an end plate 3e is disposed in the opening on the distal end side of the portion I, and is joined to the portion I by welding. Similarly, an end plate 3f is disposed in the opening on the distal end side of the portion IV, and is joined to the portion IV by welding. In this way, the gas-liquid pressure-dissolution mixer 3 is manufactured.

  Next, the operation of the gas-liquid pressurized dissolution mixer 3 configured as described above will be described.

  Water and air sucked from the pipes 20 and 21 merge at the connector 22 and flow into the air-mixing pump 2. The water and air that have flowed into the air-fuel mixture pump 2 are pressurized by the air-fuel mixture pump 2 and are jetted into the gas-liquid pressurization / dissolution mixer 3 through the pipe 23 and the nozzle 23a. At this time, the flow velocity of the jetted water and air mixed flow is preferably set to 5 to 15 m / s.

  Inside the upper passage 3A of the gas-liquid pressure-dissolution mixer 3, air is gradually dissolved in water under pressure and gas-liquid dissolution occurs. At this time, bubble nuclei (microbubbles having a particle size of 1 μm or less) that are the basis of the precipitated bubbles are formed. Water containing bubble nuclei falls downward through the falling passage 3C and flows into the lower passage 3B.

  In the lower passage 3B, the surplus gas 35 that could not be dissolved in water moves upward while passing through the passage 3D, and is discharged to the outside through the air vent valve 32a. Pressurized water containing nuclei will be separated from excess gas.

  The pressurized water is extracted from the connector 30 a through the pipe 30 to the outside of the gas-liquid pressurizing / dissolving mixer 3 and introduced into the shower head 4. The pressurized water is rapidly depressurized when passing through the fixed throttle of the shower head 4, and as a result, the gas that has been in a supersaturated state is precipitated, so that the particle size of the shower head 4 is several μ to several tens μ. Fine bubbles (microbubbles) are generated, and bubble water in which these fine bubbles are uniformly dispersed in water is generated. Bubble water is ejected from a number of nozzle holes of the shower head 4.

  Since the bubbly water discharged from the shower head 4 contains a large amount of fine bubbles, dirt on the body surface is removed together with the fine bubbles by bathing such bubbly water on the body. At this time, since the particle size of the fine bubbles is smaller than that of the pores, the fine bubbles can penetrate into the pores and the inside of the pores can be cleaned.

  As described above, according to the present embodiment, the upper passage 3A, the lower passage 3B, the falling passage 3C, and the passage 3D are configured by cutting the square pipe into a predetermined length. No need to bend. Further, since the rear end of the upper passage 3A and the upper end of the falling passage 3C, and the lower end of the falling passage 3C and the rear end of the lower passage 3B are joined by welding, welding is performed over the entire length of the upper and lower passages 3A and 3B. Thus, the welding length can be shortened and the cost can be reduced.

  By the way, conventionally, since the welding length was long, in order to prevent the deformation of the sheet metal during welding, it was necessary to increase the sheet thickness of the sheet metal to some extent, but in this embodiment, the welding length is shortened. As a result, it is possible to use a material having a small plate thickness, and the cost can be further reduced.

  In the above-described embodiment, an example in which a mixed flow of liquid and gas is introduced into the gas-liquid pressurized dissolution mixer 3 is shown, but the application of the present invention is not limited to this. Only the liquid may be introduced from the outside in a state in which the gas-liquid pressurized dissolution mixer 3 is filled with gas.

  Moreover, in the said Example, although the upper channel | path 3A, the lower channel | path 3B, and the falling channel | path 3C showed the example comprised from the square pipe, application of this invention is not limited to a square pipe, A cylindrical pipe is also used. In addition, as long as it is a hollow material, one having an arbitrary cross-sectional shape can be adopted.

  Next, FIG. 9A thru | or FIG. 9C have shown the example which attached the gas-liquid pressurization dissolution mixer by this invention integrally to bathtubs, such as a dog bath, and united the whole, FIG. 9A is a top view of the said unit 9B is a front view, and FIG. 9C is a right side view. In these drawings, the same reference numerals as those in the above-described embodiments denote the same or corresponding parts, but a part of the piping is omitted for convenience of illustration.

  In the above-described embodiment, the upper passage 3A, the lower passage 3B, and the falling passage 3C of the gas-liquid pressure-dissolution mixer 3 are disposed in the same plane, and the whole is disposed in a U-shape. Here, as shown in FIGS. 9A to 9C, the upper passage 3′A, the lower passage 3′B, and the falling passage 3′C of the gas-liquid pressure-dissolution mixer 3 ′ are not provided in the same plane. . When the X-axis, Y-axis, and Z-axis are respectively oriented in the directions shown in the drawings, the upper passage 3′A is disposed in the X-axis direction, and the lower passage 3′B is disposed in the Y-axis direction. The downward passage 3'C is disposed in the Z-axis direction.

  By disposing the passages 3′A, 3′B, 3′C of the gas-liquid pressure-dissolution mixer 3 ′ in such a direction, the discharge-side piping 30 is placed on the side surface on the front side of the dog bath 5. Since the water supply side pipe 23 is arranged along the right side surface of the dog bath 5, the pipes 23 and 30 can be piped without interfering with each other, and the dog bath The entire unit can be configured compactly by effectively using the corners of 5.

It is a schematic block diagram of the fine bubble manufacturing apparatus containing the gas-liquid pressurization dissolution mixer by one Example of this invention. It is a front view of the air-mixing pump and gas-liquid pressurization dissolution mixer which comprise a fine bubble manufacturing apparatus. It is a side view of the air-mixing pump and gas-liquid pressurization dissolution mixer which comprise a fine bubble manufacturing apparatus. It is an internal structure figure for demonstrating the action | operation of a gas-liquid pressurization dissolution mixer. (A) is a side view of a gas-liquid pressurization dissolution mixer, (b) is the front view. It is sectional drawing of a gas-liquid pressurization dissolution mixer. It is a figure which shows an example of the material removal of each square pipe which comprises a gas-liquid pressurization melt | dissolution mixer. It is a figure which shows an example of the material removal of each square pipe which comprises a gas-liquid pressurization melt | dissolution mixer. It is a top view of the apparatus which attached the fine bubble manufacturing apparatus integrally to the dog bath, and unitized the whole. FIG. 9B is a front view of the apparatus of FIG. 9A. FIG. 9B is a right side view of the apparatus of FIG. 9A. (A) is a side view of a conventional gas-liquid pressure-dissolution mixer, and (b) is a front view thereof. It is sectional drawing of the conventional gas-liquid pressurization dissolution mixer.

Explanation of symbols

3: Gas-liquid pressure dissolution mixer 3A: Upper passage (first passage)
3B: Lower passage (second passage)
3C: Falling passage (third passage)
3D: passage (fourth passage)

23b: Connector (introduction port)
30a: Connector (outlet)

Claims (3)

A gas-liquid pressure-dissolution mixer for performing gas-liquid dissolution under pressure,
A first passage through which at least a liquid is introduced from the outside and gas-liquid dissolution is performed inside;
A second passage disposed below the first passage at a distance from the first passage, storing the pressurized liquid dissolved in the gas and liquid and having an outlet for the pressurized liquid to the outside; ,
A third passage that falls downward from the rear end of the first passage and communicates the first and second passages in the vertical direction;
The first, second, and third passages are each made of a hollow material, and the rear end of the first passage and the upper end of the third passage, the lower end of the third passage, and the second passage The rear ends of the two passages are joined,
A gas-liquid pressure dissolution mixer characterized by the above-mentioned. In claim 1,
The first, second and third passages are arranged in a substantially U-shape;
A gas-liquid pressure dissolution mixer characterized by the above-mentioned. In claim 1 or 2,
At the tip of the second passage, there is provided a fourth passage extending upward for discharging excess gas.
A gas-liquid pressure dissolution mixer characterized by the above.

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