JP6503330B2 - Bubble separation and removal device - Google Patents

Description

The present invention relates to an air bubble separation and removal apparatus for efficiently separating and removing air bubbles contained in hydraulic oil, and more particularly to an air bubble separation and removal apparatus for separating and removing air bubbles from hydraulic oil using a spiral flow.

In hydraulic machines, etc., when bubbles are generated in the hydraulic oil, hydraulic equipment utilizing this hydraulic oil, which may adversely affect the system or the like. That is, in the hydraulic system used for the work power transmission of a construction machine etc., if air bubbles are mixed in the working oil which transmits the power, the rigidity of the working oil is lowered and oxidation deterioration of the working oil is promoted. In addition, when air bubbles are mixed in the hydraulic oil, the lubricating characteristics of the hydraulic oil are degraded, and furthermore, the power transmission characteristics and the operating life of the device are reduced. For this purpose, it is necessary to efficiently remove air bubbles contained in the hydraulic oil.

  Therefore, as a bubble separation and removal apparatus of this type, one disclosed in Patent Document 1 is known.

  The "defoaming device in liquid" disclosed in Patent Document 1 includes a fluid chamber having at least one inlet at one end and an outlet at the other end, and the inlet is a fluid chamber for the liquid. In the air bubble removing device which generates a tangential flow to the inner wall, the fluid chamber is connected to the first fluid chamber whose diameter gradually decreases continuously from the inlet to the outlet, and the diameter is connected to the first fluid chamber. The second fluid chamber and the second fluid chamber are formed from the end face on the inlet side of the first fluid chamber, and the second fluid chamber gradually and continuously increases toward the other end. An air outlet opening up to the vicinity of the bonding position of the air or a gas air release capillary opening up to the position is provided coaxially with the axial center of the fluid chamber.

Unexamined-Japanese-Patent No. 5-84403

  However, in the “defoaming device in liquid” described in Patent Document 1, the turbulent flow of the fluid in the first fluid chamber can not effectively and efficiently separate and remove the bubbles contained in the fluid, and There is a problem that pressure loss is also large.

  Therefore, the present invention aims to provide an air bubble removal and removal device capable of separating and removing air bubbles contained in hydraulic fluid effectively and efficiently, and having a small pressure loss.

In order to achieve the above object, the invention according to claim 1 is an air bubble separation and removal apparatus for separating and removing air bubbles from air bubble removal target hydraulic oil containing air bubbles, wherein the inlet for receiving the air bubble removal target hydraulic oil; A swirling flow forming portion that forms a swirling flow of the air bubble removal target hydraulic fluid introduced from the inflow port; and an inner diameter gradually decreases toward the downstream side of the swirling flow formed by the swirling flow forming portion A discharge chamber having a first diameter provided on a central axis of the first fluid chamber, the first end projecting into the first fluid chamber, and the tip opening the first diameter ; A second fluid chamber provided on the downstream side of the fluid chamber and having a second diameter whose inner diameter is larger than the first diameter, and a peripheral edge of a protrusion of the exhaust pipe to the first fluid chamber ; A tapered wall whose diameter gradually decreases toward the downstream side of the swirling flow; First oil to the outflow air bubbles are removed from the second fluid chamber, characterized by discharging the second oil containing air bubbles from the discharge pipe.

The invention of claim 2 is the invention of claim 1, wherein the swirl flow forming member includes a ring passage for flowing the air bubble removal target hydraulic oil flowing from the inlet, the bubble removal target operating flowing through the reflow passage A discharge port for discharging oil tangentially from at least one portion of the inner peripheral wall of the first fluid chamber.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the third aspect includes the inflow port, the swirling flow forming portion, and the first fluid chamber, and a first flange on the second fluid chamber side. A first unit having a second flange formed on the trachea side, a second fluid chamber, and a third flange formed on the first unit side and aligned with the first flange; A third unit including two units and the exhaust pipe, and a fourth flange formed on the first unit side to be aligned with the second flange; Connection between the first flange of the second 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; It is characterized by being.

  The invention of claim 4 relates to the invention according to claim 3, wherein the space between the first flange of the first unit and the third flange of the second unit and the second of the first unit Between the second flange and the fourth flange of the third unit by means of a ferrule clamp.

According to the present invention, the air bubble separation and removal apparatus for separating and removing air bubbles from the air bubble removal target hydraulic oil containing air bubbles, comprising: an inlet for receiving the air bubble removal target hydraulic oil; and the air bubbles introduced from the inlet. A swirling flow forming portion that forms a swirling flow of hydraulic fluid to be removed; a first fluid chamber whose internal diameter gradually decreases toward the downstream side of the swirling flow formed by the swirling flow forming portion; An exhaust pipe having a first diameter and provided on a central axis of a fluid chamber and having an inner diameter whose first end protrudes into the first fluid chamber and whose tip is open, and is provided downstream of the first fluid chamber . A second fluid chamber having a second diameter, the inner diameter of which is larger than the first diameter, and a peripheral edge of a protrusion of the exhaust pipe to the first fluid chamber, and an outer diameter thereof is on the downstream side of the swirling flow was gradually provided with the following small fence a tapered wall, the towards, it bubbles from the second fluid chamber A first oil that is removed by flowing, and then, is discharged a second oil containing air bubbles from the discharge pipe can be removed better bubbles an effective and efficient contained in the fluid, and the pressure The loss is also small.

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

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of a bubble separating and removing apparatus according to the present invention will be described in detail with reference to the attached drawings.

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

In Figure 1, the bubble separating device 100 according to this invention utilizes a swirling flow of the inflow air bubbles removal target hydraulic oil P0 from the inlet 11, the bubble the bubble removal target hydraulic oil P0 is removed first By separating the first hydraulic oil P1 into a second hydraulic oil P2 containing air bubbles, the air bubbles are removed from the air bubble removal target hydraulic oil P0.

The air bubble separation and removal apparatus 100 includes a swirl flow forming unit 12 that forms a swirl flow of air bubble removal target hydraulic oil P0 from air bubbles removal target hydraulic oil P0 introduced from the inlet 11, a first fluid chamber 13, and a first fluid chamber 13 The second fluid chamber 15 provided on the downstream side of the first fluid chamber 13, the exhaust pipe 14 having one end opened in the first fluid chamber 13, and the peripheral edge of the projecting portion of the exhaust pipe 14 A tapered wall 16 is provided.

  Here, the swirling flow forming unit 12 includes an annular flow passage 121 formed along the outer periphery of the swirling flow forming unit 12 and discharge ports 122 provided at two places connected to the annular flow passage 121. Configured

The first fluid chamber 13 is a space surrounded by a frusto-conical inner peripheral wall 13 a whose diameter gradually decreases toward the downstream side and the tapered wall 16, and the air bubbles removed by the swirling flow forming portion 12 The target hydraulic oil P0 is caused to flow into the space surrounded by the inner circumferential wall 13a and the tapered wall 16.

The second fluid chamber 15 has a cylindrical shape, and one end is connected to the downstream side of the first fluid chamber 13 and the other end is a first hydraulic oil from which air bubbles are removed by the air bubble separation and removal apparatus 100 An outlet 15a is formed to flow out P1.

The exhaust pipe 14 is provided on the central axis of the first fluid chamber 13, and at one end, an opening 14a which protrudes and opens into the first fluid chamber 13 is provided, and at the other end, the air bubble separation and removal device A discharge port 14b is formed to discharge the second hydraulic oil P2 including the air bubbles removed at 100.

  The tapered wall 16 is formed on the periphery of the projecting portion of the 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, the operation of the air bubble separation and removal apparatus 100 of this embodiment will be described with reference to FIGS. 2 and 3.

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

In FIG. 2 and FIG. 3, the operation fluid P0 for bubble removal to be inflowed from the inflow port 11 flows in the annular flow passage 121 of the swirling flow forming portion 12 and is connected to the annular flow passage 121 as shown by the arrow in FIG. The bubble removal target hydraulic fluid P 0 is discharged from the discharge port 122 into the first fluid chamber 13 along the tangential direction of the peripheral wall of the first fluid chamber 13. As a result, a swirling flow F of the bubble removal target hydraulic oil P0 is formed in the first fluid chamber 13.

The swirling flow F of the air bubble removal target hydraulic oil P0 formed in the first fluid chamber 13 has a frusto-conical inner circumferential wall 13a and a diameter gradually decreasing toward the downstream side of the first fluid chamber 13 It flows in the space surrounded by the tapered tapered wall 16 whose diameter gradually decreases toward the downstream side formed on the periphery of the protrusion of the trachea 14.

Here, due to the centrifugal force generated by the spiral flow F of the air bubble removal target hydraulic oil P0, the oil not containing air bubbles is directed to the peripheral wall 13a side of the first fluid chamber 13 and the air bubbles are as shown by B in FIG. It gathers around the opening 14 a of the exhaust pipe 14 in the fluid chamber 13.

  By the way, in the air bubble separation and removal apparatus 100 according to the present invention, since the tapered tapered wall 16 is formed on the peripheral edge of the projecting portion of the exhaust pipe 14, comparison is made in the case where there is no tapered wall 16 due to the presence of the tapered wall 16. As a result, the air bubbles B can be more efficiently collected around the opening of the exhaust pipe 14, so that the air bubble removal rate can be increased and the pressure loss can be reduced.

This is because the tapered wall 16 eliminates useless space through which the spiral flow F of the working fluid P0 to be removed by the swirling flow forming unit 12 flows, so that the working fluid P0 to be removed from the first fluid chamber 13 is It is considered that the turbulent flow is significantly reduced and the amount of attenuation of the flow velocity of the bubble-removing hydraulic fluid P0 is reduced.

The air bubble B collected around the opening of the exhaust pipe 14 in the first fluid chamber 13 by the spiral flow F of the air bubble removal target hydraulic oil P0 formed by the swirl flow forming unit 12 is the second fluid chamber 15 The back pressure applied from the side draws into the exhaust pipe 14, and the second hydraulic oil P 2 containing the air bubble B is discharged from the exhaust port 14 b at the other end of the exhaust pipe 14.

On the other hand, the first hydraulic oil P1 whose air bubbles have been removed in the first fluid chamber 13 by the exhaust pipe 14 flows out of the outlet 15a through the second fluid chamber 15.

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

In the graph shown in FIG. 4, the horizontal axis represents the ratio Rv of the outflow flow rate of the second hydraulic oil P2 including the air bubble B from the exhaust pipe 14 to the inflow flow of the air bubble removal target hydraulic oil P0 introduced from the inlet 11 The vertical axis shows the bubble removal rate Eb by this bubble separation and removal apparatus 100. In the experimental result example shown in FIG. 4, the measured value of the bubble removal rate Eb when the ratio Rv is sequentially changed in the case where the tapered wall 16 is provided and the case where the tapered wall 16 is not provided is plotted. did. The black circles in the graph of FIG. 4 indicate the measured values of the air bubble removal rate Eb when the tapered wall 16 is provided, and the white squares in the graph of FIG. 4 indicate the air bubble removal rate Eb when the tapered wall 16 is not provided. Indicates the measured value of

  As apparent from FIG. 4, in the air bubble separation and removal apparatus 100 of the present invention, the presence of the tapered wall 16 makes the air bubble B efficiently around the opening of the exhaust pipe 14 as compared with the case without the tapered wall 16. It is observed that it is possible to collect and the bubble removal rate is high.

  FIG. 5 is a view for explaining an example of the unit configuration in the case of producing the air bubble separation and removal apparatus 100 according to the present invention.

The air bubble separation and removal apparatus 100 according to the present invention is used for air bubble separation and removal from hydraulic oil and the like of a hydraulic machine or the like . In this case, there is a need to facilitate cleaning of the inside of the air bubble separation and removal apparatus 100 .

  Next, a unit configuration example in which the inside can be easily cleaned in the air bubble separation and removal apparatus 100 will be described. In the unit configuration example described below, a portion including the inflow port 11, the swirl flow forming portion 12, and the first fluid chamber 13 shown in FIGS. 1 and 2 is formed as a first unit 10, and a second fluid A portion including the chamber 15 is formed as a second unit 20, and a portion including the exhaust pipe 14 is formed as a third unit 30.

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

  5 (A) shows the first unit 10 including the inlet 11, the swirling flow forming unit 12, and the first fluid chamber 13, and FIG. 5 (B) shows its internal configuration.

  As shown in FIGS. 5A and 5B, in the first unit 10, the first flange 10a is formed on the second fluid chamber 15 side, and the second flange 10b is formed on the exhaust pipe 14 side. Is formed. In the first unit 10, a frusto-conical inner peripheral wall 13a whose diameter gradually decreases toward the downstream side, and an exhaust pipe 14 whose one end is open in the first fluid chamber 13 The first fluid chamber 13 is formed on the periphery of the protrusion and has a tapered wall 16 whose diameter gradually decreases toward the second fluid chamber 15 and the inner circumferential wall 13 a and the tapered wall 16. Each block is provided.

  FIG. 5C shows the second unit 20 including the second fluid chamber 15. In the second unit 20, a third flange 20a is formed on the side of the first unit 10 so as to be aligned with the first flange 10a.

  FIG. 5 (D) shows the third unit 30 including the exhaust pipe 14. In the third unit 30, a fourth flange 30a is formed on the side of the first unit 10 so as to be aligned with the second flange 10b.

  In the case of forming the air bubble separation and removal apparatus 100 using each unit shown in FIG. 5, as shown in FIG. 6A, the first flange 10a of the first unit 10 has a second flange 20a. The third flange 20 a is butted, and the fourth flange 30 a of the third unit 30 is butted to the second flange 10 b 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 the ferrule clamp 40a, The second flange 10b of the first unit 10 and the fourth flange 30a of the third unit 30 are connected using a ferrule clamp 40b.

  As described above, each component of the air bubble separation and removal apparatus 100 is united, and the units are detachably connected using the ferrule clamps 40a and 40b, so that the inside of the air bubble separation and removal apparatus 100 can be easily cleaned.

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

  Further, when cleaning of the inside of each unit of the air 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 butted, the first unit 10 Between the first flange 10a and the third flange 20a, the second flange 10b and the fourth flange 30a, after butting the second flange 10b of the second unit with the fourth flange 30a of the third unit 30 The air bubble separation and removal apparatus 100 can be easily assembled by connecting them with the ferrule clamps 40a and 40b, respectively.

  The above is one example of a representative embodiment of the present invention, but the present invention is not limited to the above embodiment and the embodiments shown in the drawings, and can be appropriately modified and implemented within the scope not changing the gist of the present invention. It is.

For example, in the above embodiment, by discharging the air bubbles removal target hydraulic oil P0 from the discharge port 122 provided in two places in the first fluid chamber 13, forming a swirling flow F of the bubble removal target hydraulic oil P0 In order to form a swirling flow of the bubble removal target liquid by discharging the bubble removal target hydraulic oil into the first fluid chamber from the discharge ports provided at one or three or more locations. It may be configured.

  Further, the tapered wall 16 formed on the periphery of the projecting portion of the exhaust pipe 14 into the first fluid chamber 13 has a tapered shape in which the diameter gradually decreases toward the second fluid chamber 15. It is not limited to the shapes described in FIGS. 1 and 2.

11 inlet 12 swirling flow forming portion 13 first fluid chamber 13a inner circumferential wall 14 exhaust 14a opening 14b outlet 15 second fluid chamber 15a outlet 16 tapered wall 10 first unit 10a first flange 10b first 2 Flange 20 2nd unit 20a 3rd flange 30 3rd unit 30a 4th flange 40a Herrule clamp 40b Ferrule clamp 100 Bubble separation and removal device P0 Bubble removal target hydraulic fluid P1 First hydraulic fluid P2 Second hydraulic oil

Claims (4)

A bubble separation and removal apparatus for separating and removing air bubbles from a bubble-removing target oil containing air bubbles, comprising:
An inlet through which the bubble removal target hydraulic oil flows;
A swirl flow forming unit that forms a swirl flow of the bubble removal target hydraulic oil introduced from the inlet;
A first fluid chamber whose internal diameter gradually decreases toward the downstream side of the swirling flow formed by the swirling flow forming portion;
An exhaust pipe provided on a central axis of the first fluid chamber, having one end projecting into the first fluid chamber and an open end having a first diameter .
A second fluid chamber provided downstream of the first fluid chamber, the second fluid chamber having a second diameter whose inner diameter is larger than the first diameter;
Is formed on the protrusion periphery to the first fluid chamber of the discharge pipe, and gradually follows the small fence a tapered wall outer diameter toward the downstream side of the swirling flow,
Equipped with
A bubble separation / removal apparatus characterized in that the first oil from which air bubbles have been removed flows out of the second fluid chamber, and the second oil containing air bubbles is discharged from the exhaust pipe. The swirling flow forming unit is
An annular flow path through which the air bubble removal target hydraulic oil introduced from the inflow port flows;
A discharge port that discharges the air bubble removal target hydraulic fluid flowing through the annular flow path in a tangential direction from at least one location of an inner peripheral wall of the first fluid chamber;
The air 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, a first flange on the second fluid chamber side, and a second flange on the exhaust gas side; A second unit including the second fluid chamber and having a third flange formed on the first unit side and aligned with the first flange; and the exhaust pipe, the first unit And a third unit formed on the side with a fourth flange aligned with the second flange,
Between the first flange of the first unit and the third flange of the second unit and the second flange of the first unit and the fourth flange of the third unit The air bubble separation and removal apparatus according to claim 1 or 2, wherein Between the first flange of the first unit and the third flange of the second unit and the second flange of the first unit and the fourth flange of the third unit The air bubble separation and removal apparatus according to claim 3, wherein the two are connected by a ferrule clamp.

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