JP2018001149A - Bubble separation and removal device - Google Patents

Abstract

A bubble separation / removal device capable of separating and removing bubbles contained in a fluid effectively and efficiently. A swirl flow forming unit that forms a swirl flow of the bubble removal target liquid from the bubble removal target liquid that has flowed in from an inflow port, and a downstream side of the swirl flow formed by the swirl flow forming unit. A first fluid chamber having a gradually decreasing diameter, an air discharge pipe provided on a central axis of the first fluid chamber, one end projecting into the first fluid chamber, and a downstream of the first fluid chamber A second fluid chamber provided on the side, and a tapered wall formed at a peripheral edge of the projecting portion of the discharge pipe and gradually decreasing in diameter toward the downstream side of the swirling flow, The first liquid from which bubbles have been removed flows out of the second fluid chamber, and the second liquid containing bubbles is discharged from the discharge tube. [Selection] Figure 1

Description

  The present invention relates to a bubble separation and removal apparatus that efficiently separates and removes bubbles contained in a viscous liquid, and more particularly to a bubble separation and removal apparatus that separates and removes bubbles from a viscous liquid using a rotating flow.

  There is a need in various fields to remove bubbles from a viscous liquid. For example, in a hydraulic machine or the like, if bubbles are generated in the hydraulic oil, it may adversely affect hydraulic equipment, systems, and the like that use the hydraulic oil. That is, in a hydraulic system used for transmission of work power of a construction machine or the like, if bubbles are mixed in the hydraulic oil that transmits power, the rigidity of the hydraulic oil is lowered and the oxidative deterioration of the hydraulic oil is promoted. Moreover, when bubbles are mixed in the hydraulic oil, the lubricating characteristic of the hydraulic oil is lowered, and further, the power transmission characteristic and the operating life of the device are lowered. For this reason, it is necessary to efficiently remove bubbles contained in the hydraulic oil.

  In addition, even in the production process of foods and medicines, it may be unpreferable if air bubbles are mixed into a viscous fluid as a raw material. In this case also, it is necessary to efficiently separate and remove the bubbles from the viscous fluid as the raw material.

  Thus, as this type of bubble separation and removal device, a device disclosed in Patent Document 1 is known.

  The “bubble removing device in liquid” disclosed in Patent Document 1 is composed of a fluid chamber having at least one inflow port at one end and an outflow port at the other end. In the bubble removing apparatus that generates a tangential flow with respect to the inner wall, the fluid chamber is connected to the first fluid chamber, the diameter of which gradually decreases in diameter from the inlet toward the outlet, and the first fluid chamber. Is formed from a second fluid chamber that gradually increases in the direction of the other end, and from the end surface on the inlet side of the first fluid chamber, the first fluid chamber and the second fluid chamber, An air vent opening that opens to the vicinity of the joint position, or a gas vent capillary that opens to the position is provided coaxially with the axis of the fluid chamber.

JP-A-5-84403

  However, in the “bubble removing device in liquid” described in Patent Document 1, the bubbles contained in the fluid cannot be separated and removed effectively and efficiently due to the turbulent flow of the fluid in the first fluid chamber. There was also a problem that the pressure loss was large.

  Therefore, an object of the present invention is to provide a bubble separation / removal device that can effectively and efficiently separate and remove bubbles contained in a fluid and has a small pressure loss.

  In order to achieve the above object, the bubble separation and removal apparatus according to the first aspect of the present invention includes an inflow port into which the bubble removal target liquid flows and a swirl flow that forms a swirl flow of the bubble removal target liquid that has flowed in from the inflow port. A first fluid chamber whose diameter gradually decreases toward the downstream side of the swirling flow formed by the forming portion, the swirling flow forming portion, and a central axis of the first fluid chamber, one end of which is provided An exhaust pipe projecting into the first fluid chamber, a second fluid chamber provided on the downstream side of the first fluid chamber, and a downstream side of the swirl flow formed at the periphery of the projecting portion of the exhaust tube A tapered wall having a tapered diameter that gradually decreases toward the surface, and the first liquid from which bubbles have been removed flows out of the second fluid chamber, and the second liquid containing bubbles from the discharge pipe It is characterized by discharging.

  According to a second aspect of the present invention, in the first aspect of the invention, the swirl flow forming unit is configured to cause the bubble removal target liquid flowing in from the inflow port to flow, and the bubble removal target liquid flowing in the ring flow path to the bubble removal target liquid. A discharge port that discharges in a tangential direction from at least one portion of the inner peripheral wall of the first liquid chamber.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the inflow port, the swirl flow forming portion, and the first fluid chamber are included, and a first flange is disposed on the second fluid chamber side. A first unit having a second flange formed on the trachea side and a second flange formed on the first unit side, the third flange being aligned with the first flange, including the second fluid chamber. And a third unit that includes the air discharge pipe and has a fourth flange formed on the first unit side that matches the second flange. 1 and the third flange of the second unit, and the second flange of the first unit and the fourth flange of the third unit are detachably connected. It is characterized by being.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the first flange of the first unit and the third flange of the second unit and the second of the first unit. The flange of the third unit and the fourth flange of the third unit are connected by a ferrule clamp.

  According to the present invention, the inflow port into which the bubble removal target liquid flows in, the swirl flow forming unit that forms the swirling flow of the bubble removal target liquid that has flowed in from the inflow port, and the swirl flow forming unit are formed. A first fluid chamber whose diameter gradually decreases toward the downstream side of the swirling flow, an air discharge pipe provided on the central axis of the first fluid chamber, and one end projecting into the first fluid chamber; A taper-like tapered wall formed on the peripheral edge of the second fluid chamber provided downstream of the first fluid chamber and the projecting portion of the air discharge pipe and gradually decreases in diameter toward the downstream side of the swirling flow And the first liquid from which bubbles are removed flows out of the second fluid chamber, and the second liquid containing bubbles is discharged from the vent pipe, so that it is included in the fluid. Air bubbles can be removed effectively and efficiently, and the pressure loss is small. An effect.

FIG. 1 is a side sectional view of a bubble separation and removal apparatus according to the present invention. FIG. 2 is a cross-sectional view of the bubble separation / removal device shown in FIG. FIG. 3 is a side sectional view for explaining the operation of the bubble separation / removal device shown in FIGS. 1 and 2. FIG. 4 is a graph showing experimental results of bubble separation / removal characteristics using the bubble separation / removal apparatus shown in FIGS. 1 and 2. FIG. 5 is a diagram for explaining an example of the unit configuration of the bubble separation / removal apparatus according to the present invention. FIG. 6 is a view showing an example of joining between units of the bubble separation and removal apparatus according to the present invention.

  Embodiments of a bubble separation and removal apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

  FIG. 1 is a side sectional view of a bubble separation and removal apparatus according to the present invention.

  In FIG. 1, a bubble separation / removal device 100 according to the present invention uses a swirl flow of a bubble removal target liquid P0 that has flowed in from an inflow port 11 to remove the bubble from the bubble removal target liquid P0. By separating the liquid P1 and the second liquid P2 containing bubbles, the bubbles are removed from the bubble removal target liquid P0.

  The bubble separation and removal apparatus 100 includes a swirl flow forming unit 12 that forms a swirl flow of the bubble removal target liquid P0 from the bubble removal target liquid P0 that has flowed in from the inflow port 11, a first fluid chamber 13, and a first fluid chamber 13. A second fluid chamber 15 provided on the downstream side of the fluid chamber 13, an air discharge pipe 14 having one end opened in the first fluid chamber 13, and a tapered wall formed at the periphery of the protruding portion of the air discharge pipe 14 16 are provided.

  Here, the swirl flow forming unit 12 includes an annular flow channel 121 formed along the outer periphery of the swirl flow forming unit 12, and discharge ports 122 provided at two locations connected to the circular flow channel 121. Composed.

  The first fluid chamber 13 is composed of a space surrounded by a truncated cone-shaped inner peripheral wall 13a and a tapered wall 16 whose diameter gradually decreases toward the downstream side, and the bubbles removed by the swirl flow forming portion 12 are removed. The target liquid P0 is caused to flow in a space surrounded by the inner peripheral wall 13a and the tapered wall 16.

  The second fluid chamber 15 has a cylindrical shape, one end is connected to the downstream side of the first fluid chamber 13, and the other end is the first liquid P1 from which bubbles are removed by the bubble separation and removal device 100. The outflow port 15a which flows out out of is formed.

  The air discharge pipe 14 is provided on the central axis of the first fluid chamber 13, and one end is provided with an opening 14 a that projects and opens into the first fluid chamber 13, and the other end is the bubble separation and removal device. A discharge port 14b for discharging the second liquid P2 including the bubbles removed at 100 is formed.

  The tapered wall 16 is formed at the periphery of the protruding portion of the air discharge pipe 14 into the first fluid chamber 13, and has a tapered shape in which the diameter gradually decreases toward the second fluid chamber 15.

  Next, with reference to FIG. 2 and FIG. 3, operation | movement of the bubble separation / removal apparatus 100 of this Example is demonstrated.

  2 is a cross-sectional view taken along line AA of the bubble separation / removal device 100 shown in FIG. 1, and FIG. 3 is a side cross-sectional view for explaining the operation of the bubble separation / removal device 100 shown in FIGS. .

  2 and 3, the bubble removal target liquid P <b> 0 that has flowed in from the inflow port 11 flows in the circular flow channel 121 of the swirl flow forming unit 12 and is connected to the circular flow channel 121, as indicated by an arrow in FIG. 2. The bubble removal target liquid P0 is discharged into the first fluid chamber 13 from the discharge port 122 along the tangential direction of the peripheral wall of the first fluid chamber 13. Thereby, a swirl flow F of the bubble removal target liquid P0 is formed in the first fluid chamber 13.

  The swirling flow F of the bubble removal target liquid P0 formed in the first fluid chamber 13 has a frustoconical inner peripheral wall 13a and an air discharge pipe whose diameter gradually decreases toward the downstream side of the first fluid chamber 13. 14 flows in a space surrounded by a tapered wall 16 having a tapered diameter gradually decreasing toward the downstream side formed on the periphery of the protruding portion.

  Here, due to the centrifugal force generated by the swirl flow F of the bubble removal target liquid P0, the oil that does not contain bubbles is directed to the peripheral wall 13a side of the first fluid chamber 13, and the bubbles are the first as shown by B in FIG. Gather around the opening 14a of the air release tube 14 in the fluid chamber 13.

  By the way, in the bubble separation / removal device 100 according to the present invention, since the tapered wall 16 is formed on the periphery of the projecting portion of the air discharge tube 14, the presence of the tapered wall 16 makes the comparison with the case where the tapered wall 16 is not provided. As a result, the bubbles B can be collected more efficiently around the opening of the discharge tube 14, so that the bubble removal rate can be increased and the pressure loss can be reduced.

  This is because the taper wall 16 eliminates a useless space in which the swirl flow F of the bubble removal target liquid P0 formed by the swirl flow forming unit 12 flows, so that the turbulent flow of the bubble removal target liquid P0 in the first fluid chamber 13 is eliminated. It is considered that this is because the amount of decrease in the flow velocity of the bubble removal target liquid P0 is reduced.

  The bubbles B collected around the opening of the discharge pipe 14 in the first fluid chamber 13 by the swirl flow F of the bubble removal target liquid P0 formed by the swirl flow forming unit 12 are moved to the second fluid chamber 15 side. The second liquid P <b> 2 containing the bubbles B is discharged from the discharge port 14 b at the other end of the discharge tube 14 by the back pressure applied from the discharge tube 14.

  On the other hand, the second liquid P1 from which bubbles have been removed in the first fluid chamber 13 by the discharge tube 14 flows out from the outlet 15a through the second fluid chamber 15.

  FIG. 4 is a graph showing an example of an experimental result of bubble separation / removal characteristics using the bubble separation / removal apparatus 100 shown in FIGS. 1 and 2.

  In the graph shown in FIG. 4, the horizontal axis indicates the ratio Rv of the outflow rate of the second liquid P2 including the bubbles B from the discharge pipe 14 to the inflow rate of the bubble removal target liquid P0 that has flowed in from the inlet port 11. The vertical axis represents the bubble removal rate Eb by the bubble separation and removal apparatus 100. In the experimental result example shown in FIG. 4, the measured value of the bubble removal rate Eb is plotted when the ratio Rv is sequentially changed when the tapered wall 16 is provided and when the tapered wall 16 is not provided. did. In the graph of FIG. 4, black circles indicate measured values of the bubble removal rate Eb when the tapered wall 16 is provided, and white squares in the graph of FIG. 4 indicate the bubble removal rate Eb when the tapered wall 16 is not provided. The measured value is shown.

  As apparent from FIG. 4, in the bubble separation / removal device 100 of the present invention, the presence of the tapered wall 16 allows the bubbles B to be efficiently introduced to the periphery of the opening of the air discharge pipe 14 as compared with the case without the tapered wall 16. It becomes possible to collect and it is recognized that the bubble removal rate becomes high.

  FIG. 5 is a diagram for explaining an example of a unit configuration when the bubble separation / removal device 100 according to the present invention is created.

  The bubble separation / removal device 100 according to the present invention can be applied to bubble separation / removal from hydraulic fluid such as a hydraulic machine, bubble separation / removal from a fluid in the manufacturing process of food and medicine, and the like. For this reason, it is required to facilitate the cleaning of the inside of the bubble separation and removal apparatus 100.

  Next, a description will be given of a unit configuration example in which the internal cleaning of the bubble separation and removal apparatus 100 can be facilitated. In the unit configuration example described below, a portion including the inlet 11, the swirl flow forming portion 12, and the first fluid chamber 13 shown in FIGS. 1 and 2 is formed as the first unit 10, and the second fluid A portion including the chamber 15 is formed as the second unit 20, and a portion including the air discharge tube 14 is formed as the third unit 30.

  FIG. 5 is a diagram for explaining an example of the unit configuration of the bubble separation and removal apparatus 100 according to the present invention.

  5A shows the first unit 10 including the inlet 11, the swirl flow forming portion 12, and the first fluid chamber 13, and FIG. 5B shows the internal configuration thereof.

  As shown in FIGS. 5A and 5B, the first unit 10 has a first flange 10a formed on the second fluid chamber 15 side and a second flange 10b on the air discharge pipe 14 side. Is formed. Further, inside the first unit 10, there are a frustoconical inner peripheral wall 13 a whose diameter gradually decreases toward the downstream side, and an air discharge pipe 14 whose one end is open in the first fluid chamber 13. A tapered wall 16 formed at the periphery of the protruding portion and gradually decreases toward the second fluid chamber 15, and a first fluid chamber 13 surrounded by the inner peripheral wall 13 a and the tapered wall 16 are formed. Each block is provided.

  FIG. 5C shows the second unit 20 including the second fluid chamber 15. The second unit 20 is formed with a third flange 20a that is aligned with the first flange 10a on the first unit 10 side.

  FIG. 5D shows the third unit 30 including the air discharge tube 14. The third unit 30 is formed with a fourth flange 30a that is aligned with the second flange 10b on the first unit 10 side.

  When forming the bubble separation / removal device 100 using each unit shown in FIG. 5, as shown in FIG. 6A, the second flange 20 a of the first unit 10 is connected to the second flange 20 a of the second unit 20. The third flange 20a is butted, and the fourth flange 30a of the third unit 30 is butted against the second flange 10b of the first unit 10.

  Then, as shown in FIG. 6B, the first flange 10a of the first unit 10 and the third flange 20a of the second unit 20 are connected using a ferrule clamp 40a, The second flange 10b of one unit 10 and the fourth flange 30a of the third unit 30 are connected using a ferrule clamp 40b.

  As described above, the components of the bubble separation / removal device 100 are unitized, and each unit is detachably connected using the ferrule clamps 40a and 40b, thereby facilitating the cleaning of the inside of the bubble separation / removal device 100.

  For example, in the bubble separation and removal apparatus 100 in the state shown in FIG. 6B, if the connection by the ferrule clamps 40a and 40b is released, each unit of the bubble separation and removal apparatus 100 can be disassembled. The inside of each unit of the removal apparatus 100 can be easily cleaned.

  When the cleaning of the inside of each unit of the bubble separation and removal apparatus 100 is completed, the first flange 10a of the first unit 10 and the third flange 20a of the second unit 20 are abutted, and the first unit 10 After the butting of the second flange 10b of the third unit 30 and the fourth flange 30a of the third unit 30, between the first flange 10a and the third flange 20a, the second flange 10b and the fourth flange 30a. Can be assembled easily by using the ferrule clamps 40a and 40b.

  The above is an example of a typical embodiment of the present invention. However, the present invention is not limited to the above-described embodiment and the embodiment shown in the drawings, and can be implemented with appropriate modifications within the scope not changing the gist thereof. It is.

  For example, in the above embodiment, the bubble removal target liquid P0 is discharged into the first fluid chamber 13 from the discharge ports 122 provided at two locations, thereby forming the swirl flow F of the bubble removal target liquid P0. However, it is configured to form a swirling flow of the bubble removal target liquid by discharging the bubble removal target liquid into the first fluid chamber from the discharge ports provided at one place or three places or more. Also good.

  Further, the tapered wall 16 formed at the peripheral edge of the projecting portion of the discharge pipe 14 into the first fluid chamber 13 has a tapered shape whose diameter gradually decreases toward the second fluid chamber 15. What is necessary is just and it is not limited to the shape described in FIG.1 and FIG.2.

DESCRIPTION OF SYMBOLS 11 Inflow port 12 Swirling flow formation part 13 1st fluid chamber 13a Inner peripheral wall 14 Air exhaust pipe 14a Opening part 14b Outlet 15 Second fluid chamber 15a Outlet 16 Tapered wall 10 1st unit 10a 1st flange 10b 1st 2 flange 20 second unit 20a third flange 30 third unit 30a fourth flange 40a ferrule clamp 40b ferrule clamp 100 bubble separation and removal device P0 bubble removal target liquid P1 first liquid P2 second liquid

Claims (4)

An inlet for the bubble removal target liquid,
A swirl flow forming unit that forms a swirl flow of the bubble removal target liquid flowing in from the inflow port;
A first fluid chamber whose diameter gradually decreases toward the downstream side of the swirling flow formed by the swirling flow forming portion;
An air discharge pipe provided on a central axis of the first fluid chamber and having one end protruding into the first fluid chamber;
A second fluid chamber provided downstream of the first fluid chamber;
A taper-shaped tapered wall formed on the periphery of the projecting portion of the exhaust pipe and gradually decreasing in diameter toward the downstream side of the swirling flow;
Comprising
A bubble separation / removal apparatus characterized in that the first liquid from which bubbles are removed flows out of the second fluid chamber, and the second liquid containing bubbles is discharged from the vent pipe. The swirl flow forming part is
An annular flow path for flowing the bubble removal target liquid flowing in from the inlet;
A discharge port for discharging the bubble removal target liquid flowing in the annular flow channel in a tangential direction from at least one of the inner peripheral walls of the first fluid chamber;
The bubble separation and removal apparatus according to claim 1, comprising: A first unit including the inlet, the swirl flow forming portion, and the first fluid chamber, wherein a first flange is formed on the second fluid chamber side, and a second flange is formed on the exhaust pipe side; A second unit including the second fluid chamber and having a third flange formed on the first unit side to be aligned with the first flange; and the air discharge pipe. A third unit having a fourth flange formed on a side thereof that is aligned with the second flange;
Between the first flange of the first unit and the third flange of the second unit and between the second flange of the first unit and the fourth flange of the third unit. The bubble separation / removal device according to claim 1, wherein the bubble separation and removal device is detachably connected.   Between the first flange of the first unit and the third flange of the second unit and between the second flange of the first unit and the fourth flange of the third unit. The bubble separation and removal device according to claim 3, wherein the two are connected by a ferrule clamp.

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