JP2013043112A - Gas-liquid separation tank and gas-liquid mixture dissolving apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-liquid separation tank which can suppress labor and cost required for its manufacture by devising elimination of the necessity of boring a hole on a main member which is cylindrical and is made of a resin or welding a pipe to the main member.SOLUTION: An upper side cylindrical part 34 is continuously attached to the upper side opening of a body cylindrical vessel 31 which is cylindrical and is made of the resin. The upper side cylindrical part 34 has, at its flank, a gas-liquid mixed fluid inlet 32 for introducing gas-liquid mixed fluid into the body cylindrical vessel 31 from a tangential direction and further has, at its upper end surface, a gas outlet 33 for discharging gas separated from the fluid. At its lower side opening of the body cylindrical vessel 31, a bottom plate part 36 having a liquid taking-out port 35 is provided. A buffer plate 38 is provided above the liquid taking-out port 35 of the bottom plate part 36 via a liquid passage gap 37.

Description

  The present invention relates to a gas-liquid separation tank that separates a gas that has not been dissolved in a liquid in a gas-liquid mixing and dissolving step, and a gas-liquid mixing and dissolving apparatus that uses the gas-liquid separation tank.

  As shown in FIG. 4, a gas-liquid mixing and dissolving apparatus 1 used as a microbubble generator for generating microbubbles such as microbubbles, etc. includes a vortex pump 2 that mixes gas in liquid, and further gas in liquid A dissolution tank 3 that dissolves the gas and a gas-liquid separation tank 4 that separates a gas that has not been dissolved in the liquid are sequentially connected by piping (see, for example, Patent Document 1).

  The gas-liquid separation tank has a gas outlet at the ceiling of the main body container, a gas-liquid mixed fluid inlet near the center, a liquid outlet at the lower side, and a partition wall just before the liquid outlet. There is a gas-liquid separator sealed with a bottom plate (see, for example, Patent Document 2).

  Since the gas-liquid mixed fluid inlet of the gas-liquid separator described in Patent Document 2 is connected in the cylinder tangential direction of the main body container, the gas-liquid mixed fluid flowing from the inlet swirls along the inner wall of the cylinder. If the flow velocity of the gas-liquid mixed fluid is high, the vortex generated is strong, and the funnel-shaped vortex consisting of a mixture of liquid and gas does not disappear to the bottom of the main body container. If a partition is provided immediately before the vortex, the vortex is obstructed by the partition, and the vortex is weakened or disappears below the partition, so that the gas cannot reach the deep part of the liquid in the place where the vortex does not exist, and the specific gravity The gas rises due to the difference. Further, since the liquid once passes through the lower part of the partition wall before reaching the liquid outlet, the gas cannot pass through the part yet, and the gas-liquid separation is efficiently performed.

  Further, as the gas-liquid separation tank, there is the following bubble removing device. This bubble removing device forms a cylindrical inflow space, an inverted conical conical space, and a small cylindrical outflow space in the main body, and an inlet opening to the inflow space and an outlet opening to the outflow space are respectively It is provided in the tangential direction of each space. Above the inflow space, there is a discharge port for discharging bubbles, and there is a valve chamber between the discharge port and the inflow space, and a cylinder having a through hole is provided in the valve chamber. This cylinder is fitted with a cap-like float having a plate. When a certain amount of bubbles accumulates in the inflow space, the float is raised by internal pressure, opens a through hole, and only the bubbles. Is discharged from the discharge port, so that bubbles contained in the fluid can be efficiently removed (see, for example, Patent Document 3).

JP 2001-129377 A JP 2003-265984 A JP 2001-137615 A

  Since the gas-liquid separator described in Patent Document 2 has a gas outlet, a gas-liquid mixed fluid inlet, a liquid outlet, a partition wall, and the like directly attached to the main body container, it seems that the structure is simple. In order to obtain a structure, it is necessary to make the main body container made of metal and weld pipes and partition walls to the main body container.

  In addition, the bubble removing device described in Patent Document 3 has a valve chamber provided between a discharge port for discharging bubbles in the upper part of the main body and an inflow space, and a complicated bubble discharging mechanism such as a cylinder and a float in the valve chamber. There is a problem that it takes time to manufacture and costs.

  This invention is made in view of such a point, and can suppress the effort and cost concerning manufacture by devising which eliminates the need to make a hole in a cylindrical resin-made main member or to weld piping. An object of the present invention is to provide a gas-liquid separation tank that can be used, and to provide a gas-liquid mixing and dissolving apparatus using the gas-liquid separation tank.

  The invention described in claim 1 is continuously attached to a cylindrical resin-made main body cylindrical container in which an opening is installed in the vertical direction, and an upper opening of the main body cylindrical container. An upper cylindrical portion having a gas outlet for introducing a gas-liquid mixed fluid to be introduced into the main body cylindrical container from the tangential direction on the side surface and a gas outlet for discharging gas separated from the liquid on the upper end surface; and a lower part of the main body cylindrical container A gas-liquid separation tank comprising a bottom plate portion having a liquid outlet provided in a side opening, and a buffer plate provided on the liquid outlet of the bottom plate portion via a liquid passage.

  According to a second aspect of the present invention, the liquid outlet in the gas-liquid separation tank according to the first aspect is drilled in the center of the bottom plate, and the buffer plate is parallel to the bottom plate and the liquid outlet. The liquid-liquid separation between the bottom plate and the buffer plate is a gas-liquid separation that is open toward the four sides in the main body cylindrical container. It is a tank.

  According to a third aspect of the present invention, there is provided a gas-liquid separation tank according to the first or second aspect, wherein a conical shape is provided in the upper cylindrical portion that is gradually reduced in diameter from the upper side of the gas-liquid mixed fluid inlet to the gas outlet. It is a gas-liquid separation tank equipped with an air guide plate.

  The invention described in claim 4 is connected to the vortex pump that mixes the gas in the liquid, the vortex pump to the vortex pump by a pipe, and dissolves the gas in the liquid, and is connected to the lysis tank by the pipe. A gas-liquid mixing and dissolving apparatus comprising the gas-liquid separation tank according to any one of claims 1 to 3, which separates a gas that has not been dissolved in the liquid.

  According to the invention described in claim 1, the main body cylindrical container in which the opening is installed in the vertical direction, the upper cylindrical portion having the gas-liquid mixed fluid inlet and the gas outlet, the bottom plate portion having the liquid outlet and the buffer plate, Are provided separately, eliminating the need for drilling the gas-liquid mixed fluid inlet, gas outlet and liquid outlet in the main body cylindrical container and welding pipes and buffer plates, making the main main body cylindrical container inexpensive. Since it can be made of a cylindrical resin used as a piping member or the like, it is possible to provide a gas-liquid separation tank that can reduce labor and cost for manufacturing.

  Further, by providing the gas-liquid mixed fluid inlet in the tangential direction, the liquid and the gas are swirled in the main body cylindrical container, and the gas that has not been dissolved in the liquid is collected as bubbles in the central shaft portion in the main body cylindrical container, While discharging from the outlet to the outside, on the other hand, by providing a buffer plate on the liquid outlet via a liquid passage gap, the bubble column to be formed in the central axis portion of the main body cylindrical container is removed by the buffer plate from the central axis. The air bubbles gathered around the central shaft of the main body cylindrical container flow out of the liquid outlet with the liquid as it is. In addition, the swirl vortex is disturbed so that the differential pressure between the central shaft portion of the main body cylindrical container and the inner wall surface does not increase, and negative pressure is prevented from standing at the central shaft portion of the main body cylindrical container. By With a gas can be efficiently discharged from the top of the gas outlet, thereby preventing bubbling to separate from the liquid to grow to a size of bubbles visible to the gas dissolved in the liquid.

  According to the invention described in claim 2, the buffer plate is larger than the liquid outlet arranged parallel to the bottom plate portion of the main body cylindrical container and concentrically with the liquid outlet formed in the center portion of the bottom plate portion. Since it is a flat plate and the liquid passage gap between the bottom plate and the buffer plate is opened in four directions in the main body cylindrical container, it flows into the main body cylindrical container from the tangential direction and swivels in the main body cylindrical container. However, the high-speed vortex around the central axis of the main body cylindrical container that was about to flow out from the center of the bottom plate was unbalanced by the buffer plate and dispersed around the central axis to form a plurality of small vortices. The vortex around the central shaft portion is gently swirled to reduce the strong centrifugal force due to the high-speed vortex around the central shaft portion, and the strong negative pressure portion generated at the central shaft portion of the main body cylindrical container is reduced. By disappearing, in the liquid It is possible to collect only gas lumps mixed in a relatively large bubble state in the liquid while suppressing the separation of the dissolved gas into the negative pressure part (including the growth of fine bubbles), and the fine bubbles Can be retained in the main body cylindrical container for a long time by being swung in the main body cylindrical container on the upward flow reflected by the buffer plate, and can promote dissolution of fine bubbles in the liquid.

  According to the third aspect of the present invention, the conical extraction guide plate installed in the upper cylindrical portion smoothly guides and discharges the swirling gas separated from the liquid in the main body cylindrical container to the gas outlet. be able to.

  According to the fourth aspect of the present invention, it is possible to eliminate the necessity of drilling the gas-liquid mixed fluid inlet, the gas outlet, and the liquid outlet in the main body cylindrical container of the gas-liquid separation tank or welding the pipe and the buffer plate. Since the main body cylindrical container can be made of a cylindrical resin used as an inexpensive piping member, a vortex pump and a dissolution tank are connected to a gas-liquid separation tank mainly composed of the main body cylindrical container. An inexpensive gas-liquid mixing and dissolving apparatus can be provided.

It is sectional drawing which shows one Embodiment of the gas-liquid separation tank which concerns on this invention. It is a top view which shows the buffer plate of a separation tank same as the above. It is a perspective view which shows one Embodiment of the gas-liquid mixing dissolution apparatus which has a separation tank same as the above. It is a piping diagram which shows the conventional gas-liquid mixing dissolution apparatus.

  Hereinafter, the present invention will be described in detail based on the embodiment shown in FIGS.

  FIG. 3 shows a gas-liquid mixing / dissolving device 11. The gas-liquid mixing / dissolving device 11 includes a vortex pump 12 that mixes gas in the liquid and a dissolution tank 13 that dissolves gas in the liquid. The dissolution tank 13 connected and the gas-liquid separation tank 15 for separating the gas not dissolved in the liquid are connected by a pipe 16.

  The vortex pump 12 is installed on the base frame 17, and the dissolution tank 13 and the gas-liquid separation tank 15 are installed on a base 18 on the base frame 17.

  The vortex pump 12 sucks liquid into the pump suction port portion 12a through the liquid suction pressure adjusting valve 19 and the pressure gauge 20 for adjusting the liquid suction pressure, and intake air inserted into the pump suction port portion 12a from the outside. Gas, such as air, is sucked in through a pipe (not shown in the figure), and gas-liquid mixing is promoted in a stage where the annular passage in the pump main body 12b is transported almost once in a vortex between many rotor blades. The gas-liquid mixed fluid is discharged from a pump discharge port portion 12c provided on the upper side of the nozzle.

  The dissolution tank 13 is a gas-liquid mixed fluid discharged from the vortex pump 12 is pressurized and supplied to the upper part of the tank, and promotes dissolution of gas into the liquid in the process from taking out from the outlet at the lower part of the tank. The tank body is formed by bonding similar synthetic resin flanges 22 and 23 to upper and lower opening end edges of a synthetic resin pipe 21 such as a hard vinyl chloride pipe used in water and sewage.

  As shown in FIG. 1, the gas-liquid separation tank 15 is continuously formed in a cylindrical body 31 made of a cylindrical resin whose opening is installed in the vertical direction and an opening on the upper side of the cylindrical body 31. A gas-liquid mixed fluid inlet 32 for introducing the gas-liquid mixed fluid into the main body cylindrical container 31 from the tangential direction is provided on the side surface, and a gas outlet 33 for discharging the gas separated from the liquid is provided on the upper end surface. An upper cylindrical portion 34, a bottom plate portion 36 having a liquid outlet 35 provided in an opening on the lower side of the main body cylindrical container 31, and a liquid passing gap 37 on the liquid outlet 35 of the bottom plate portion 36. And a buffer plate 38 provided. A drain port 39 is provided in the bottom plate portion 36, and a pipe normally closed by a valve (not shown) is connected to the drain port 39.

  The main body cylindrical container 31 is formed by bonding similar synthetic resin flanges 31b and 31c to upper and lower openings of a synthetic resin pipe 31a such as a vinyl chloride pipe used in water and sewage.

  On the other hand, the upper cylindrical portion 34 is provided with a gas-liquid mixed fluid inlet 32 and a gas outlet 33, and welds a pipe 16 or the like to them or forms a screw hole, so that a metal lid member 34b and a metal flange are formed on the metal cylinder 34a. Similarly, the member 34c is welded, and similarly, the bottom plate portion 36 also forms a liquid outlet 35 having a screw hole in the metal plate member.

  In the upper cylindrical portion 34, a conical evacuation guide plate 41 having a gradually decreasing diameter is installed from the upper portion of the gas-liquid mixed fluid inlet 32 to the gas outlet 33. The gas outlet 33 is provided with an exhaust valve 42 for adjusting the amount of exhaust.

  As shown in FIG. 2, the liquid outlet 35 is formed in the center of the bottom plate portion 36, and the buffer plate 38 is parallel to the bottom plate portion 36 and concentrically with the liquid outlet 35. It is a flat plate larger than the liquid outlet 35 disposed, and the liquid passage gap 37 between the bottom plate portion 36 and the buffer plate 38 is opened toward the four directions in the main body cylindrical container 31. Yes.

  That is, the buffer plate 38 is parallel to the bottom plate portion 36 by the support plates 45, 46, 47, 48 arranged in four directions, and is concentric with the liquid outlet 35. Is attached. The two support plates 45 and 47 are fixed to the bottom plate portion 36 with screws.

  As shown in FIG. 3, a pipe 49 is connected to the liquid outlet 35 provided on the lower side of the buffer plate 38, and this pipe 49 communicates with, for example, a bathtub that requires fine bubbles such as microbubbles. Has been.

  Next, the function and effect of the above embodiment will be described.

  A gas such as air is sucked together with the liquid by the vortex pump 12, the gas and liquid are mixed and stirred while being transferred in the vortex pump 12, and the gas-liquid mixed fluid discharged from the vortex pump 12 is supplied to the upper part of the dissolution tank 13. While the gas-liquid mixed fluid descends in the dissolution tank 13, the gas is dissolved into the liquid, and the gas-liquid mixed fluid A is supplied to the gas-liquid separation tank 15 from the lower part of the dissolution tank 13 through the pipe 16. The gas mixed as bubbles without being dissolved in the liquid is separated, and the gas B is discharged from the vent valve 42 to the outside, and the liquid C in which the gas is dissolved at a high concentration is piped from the liquid outlet 35. For example, microbubbles such as microbubbles are generated in the bathtub or the like by taking it out to 49 and supplying it to the bathtub or the like.

  The gas-liquid separation tank 15 swirls the gas-liquid mixed fluid in the upper cylindrical portion 34 and the main body cylindrical container 31 positioned below the upper cylindrical portion 34 by providing the gas-liquid mixed fluid inlet 32 in the tangential direction of the upper cylindrical portion 34. And collect air bubbles in the central shaft.

  At this time, in order to separate the liquid and the gas, it is necessary to prevent the lower cylindrical shape of the main body cylindrical container 31 from being a conical shape or increasing the flow rate into the main body cylindrical container 31 to form a clean bubble column. That is, in such a state that air bubbles are strongly collected in the central shaft portion, the differential pressure between the central shaft portion and the inner wall surface portion of the main body cylindrical container 31 becomes large, and the gas is discharged from the upper gas outlet 33. Air bubbles accumulated in the central shaft part are easily discharged from the liquid outlet 35 together with the liquid, and the gas dissolved in the liquid is easily separated from the liquid more than necessary at the central shaft part of the main body cylindrical container 31. There is a risk.

  In order to eliminate such a risk, by attaching a buffer plate 38 to the liquid outlet 35 of the main body cylindrical container 31, a smooth swirling flow is disturbed to diffuse the bubble column from the central shaft portion to the surroundings, and a clean bubble column The structure prevents the central axis of the main body cylindrical container 31 from leaving the gas collected from the liquid outlet 35 and does not increase the differential pressure between the tank central axis and the tank inner wall. In this way, the gas dissolved in the liquid grows into bubbles having a visible size and prevents bubbles from separating from the liquid.

  And the main body cylindrical container 31 with the opening portion installed in the vertical direction is an upper cylindrical portion 34 having a gas-liquid mixed fluid inlet 32 and a gas outlet 33, and a bottom plate portion 36 having a liquid outlet 35 and a buffer plate 38. Since it is provided separately, it eliminates the need for drilling the gas-liquid mixed fluid inlet 32, gas outlet 33 and liquid outlet 35 in the main body cylindrical container 31, and welding pipes and buffer plates 38. Since the container 31 can be made of a cylindrical resin used as an inexpensive piping member or the like, it is possible to provide the gas-liquid separation tank 15 that can reduce labor and cost for manufacturing.

  Further, by providing the gas-liquid mixed fluid inlet 32 in the tangential direction, the liquid and the gas are swirled in the main body cylindrical container 31, and the gas that has not been dissolved in the liquid is formed as a bubble in the central shaft portion in the main body cylindrical container 31. Collected and discharged from the gas outlet 33 to the outside. On the other hand, by providing the buffer plate 38 on the liquid outlet 35 via the liquid passage gap 37, it is about to be formed in the central shaft portion of the main body cylindrical container 31. The bubble column is diffused around the central axis portion by the buffer plate 38 to prevent the formation of a clean bubble column at the central axis portion of the main body cylindrical container 31, thereby gathering at the central axis portion of the main body cylindrical container 31. The air bubbles can be prevented from flowing out from the liquid outlet 35 together with the liquid, and the swirl vortex can be disturbed so that the differential pressure between the central shaft portion and the inner wall surface of the main body cylindrical container 31 does not increase. Strong negative pressure is generated at the center shaft of 31 By preventing this, the gas can be efficiently discharged from the upper gas outlet 33, and even the gas dissolved in the liquid can be prevented from growing into a visible bubble and separated from the liquid.

  That is, the buffer plate 38 is a flat plate larger than the liquid outlet 35 disposed in a concentric manner with the liquid outlet 35 provided in the center of the bottom plate 36 in parallel with the bottom plate 36 of the main body cylindrical container 31. And the liquid passage gap 37 between the bottom plate portion 36 and the buffer plate 38 is opened toward the four directions inside the main body cylindrical container 31, so that it flows into the main body cylindrical container 31 from the tangential direction and flows into the main body cylindrical container. The high-speed vortex around the central axis portion of the main body cylindrical container that was about to flow out from the center portion of the bottom plate portion 36 while swirling in 31 is unbalanced by the buffer plate 38 and dispersed around the central axis portion. Accordingly, the vortex around the central axis portion is gently swirled, and a plurality of small vortices d are gently swirled along with the large vortex D in the main body cylindrical container 31.

  The effect brought about by such a phenomenon is that the strong centrifugal force due to the high-speed vortex around the central shaft portion is reduced and the strong negative pressure portion generated in the central shaft portion of the main body cylindrical container 31 is eliminated, so that While suppressing the separation of dissolved gas into the negative pressure part (including the growth of fine bubbles), it is possible to collect only gas masses mixed in a relatively large bubble state in the liquid, and fine bubbles Can be retained in the main body cylindrical container 31 for a long time by being swung in the main body cylindrical container 31 on the upward flow reflected by the buffer plate 38, thereby promoting the dissolution of fine bubbles in the liquid.

  Further, the conical air guide plate 41 installed in the upper cylindrical portion 34 can smoothly guide and discharge the swirling gas separated from the liquid in the main body cylindrical container 31 to the gas outlet 33. .

  In addition, the main body cylindrical container 31 of the gas-liquid separation tank 15 is made free of the need to drill holes in the gas-liquid mixed fluid inlet 32, gas outlet 33 and liquid outlet 35, or weld pipes and buffer plates 38. Since the main body cylindrical container 31 can be made of a cylindrical resin used as an inexpensive piping member or the like, the vortex pump 12 and the dissolution tank 13 are provided for the gas-liquid separation tank 15 whose main material is the main body cylindrical container 31. By connecting, an inexpensive gas-liquid mixing and dissolving apparatus can be provided.

  INDUSTRIAL APPLICABILITY The present invention can be used by those who are involved in the manufacturing industry, the sales industry, the industrial industry, etc. of the gas-liquid separation tank and the gas-liquid mixing and dissolving apparatus.

A Gas-liquid mixed fluid B Gas C liquid
11 Gas-liquid mixing and dissolving equipment
12 Eddy current pump
13 Dissolution tank
14 Piping
15 Gas-liquid separation tank
16 Piping
31 Main body cylindrical container
32 Gas-liquid mixed fluid inlet
33 Gas outlet
34 Upper cylindrical part
35 Liquid outlet
36 Bottom plate
37 Fluid gap
38 Buffer plate
41 Bleeding guide plate

Claims (4)

A cylindrical body made of a cylindrical resin with an opening installed in the vertical direction;
A gas that is continuously attached to the upper opening of the main body cylindrical container, has a gas-liquid mixed fluid inlet for introducing the gas-liquid mixed fluid into the main body cylindrical container from the tangential direction, and is separated from the liquid. An upper cylindrical portion having a gas outlet at the upper end surface for discharging
A bottom plate having a liquid outlet provided in the lower opening of the main body cylindrical container;
A gas-liquid separation tank comprising: a buffer plate provided on a liquid outlet of the bottom plate portion via a liquid passage gap. The liquid outlet is drilled in the center of the bottom plate,
The buffer plate is a flat plate larger than the liquid outlet arranged in parallel with the bottom plate and concentrically with the liquid outlet.
The gas-liquid separation tank according to claim 1, wherein the liquid passage gap between the bottom plate portion and the buffer plate is opened toward four directions in the main body cylindrical container. The gas-liquid separation tank according to claim 1 or 2, further comprising a conical vent guide plate provided in the upper cylindrical portion so as to gradually decrease in diameter from the upper portion of the gas-liquid mixed fluid inlet to the gas outlet. A vortex pump that mixes gas in the liquid;
A dissolution tank connected to the vortex pump by a pipe and dissolving a gas in the liquid;
A gas-liquid mixing and dissolving apparatus comprising the gas-liquid separation tank according to any one of claims 1 to 3, wherein the gas-liquid separation tank is connected to the dissolution tank by a pipe and separates a gas that has not been dissolved in the liquid.

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