JP5716220B1 - Device for separating and removing bubbles in fluid - Google Patents

Abstract

To provide a compact device for separating and removing bubbles in a fluid that effectively and efficiently removes bubbles contained in the fluid. SOLUTION: A cylindrical housing H and a first region 100 along a central axis in the housing H are housed in a bubble removal target fluid to flow in and form a swirl flow of the bubble removal target fluid. And a bubble separation device 110 that separates the bubble removal target fluid into a first fluid from which bubbles have been removed and a second fluid containing bubbles, and a second region surrounding the first region in the housing H. And a bubble coupling device 210 that enlarges the diameter of the bubbles by coupling the bubbles contained in the second fluid separated by the bubble separation device 110. [Selection] Figure 1

Description

  The present invention relates to a device for separating and removing bubbles in a fluid, and in particular, it is possible to effectively remove bubbles generated in a viscous fluid such as hydraulic oil in an oil tank of a hydraulic machine. The present invention relates to a separation and removal apparatus.

  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.

  For example, in a hydraulic system used for transmission of work power such as construction machinery, if air 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. This lowers the lubrication characteristics of the machine and further reduces the power transmission characteristics and operating life of the equipment.

  Therefore, there is a demand for an apparatus or system that effectively removes air bubbles mixed in hydraulic oil or the like. Conventionally, as this type of air bubble removal system, one disclosed in Patent Document 1 is known.

  This bubble removal system is a device in which a bubble removal device is installed on the final return side of a fluid circuit used for driving. Specifically, in a liquid system that sucks and discharges liquid in a swaying tank by a pump, a swirling flow is generated. A bubble removal device that collects the given bubbles at the center of the device axis and discharges the collected bubbles is installed on the return circuit to the tank, and after removing the liquid bubbles returning to the tank with this bubble removal device, pump suction This is intended to eliminate the influence of air bubbles that flow into the side of the tank and thereby get caught in the fluid in the tank.

JP-A-8-318103

  However, since the bubble removing device in the “bubble removing system” described in Patent Document 1 is strongly influenced by the flow rate of the fluid, effective bubble removal covering a wide flow range that varies depending on the working conditions can be performed. There was a problem that I could not.

  Further, in the “bubble removing system” described in Patent Document 1, the first fluid containing bubbles separated by the bubble removing device is configured to be returned to the upper layer of the tank. When the amount of fluid is increased, the first fluid contains minute bubbles, so depending on the state of the tank that is shaken, the minute bubbles may be remixed with the fluid in the tank. However, the original purpose of removing bubbles may not be achieved.

  Furthermore, many of the bubbles contained in the first fluid are distributed on the surface of the fluid in the tank. As a result, there is a problem that the heat dissipation characteristics in the tank are deteriorated.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a compact device for separating and removing bubbles in a fluid that effectively and efficiently removes bubbles contained in the fluid.

In order to achieve the above object, a device for separating and removing bubbles in a fluid according to a first aspect of the present invention is housed in a cylindrical housing and a first region along the central axis in the housing, and a bubble removal target fluid is contained in the device. A bubble separation device that separates the bubble removal target fluid into a first fluid from which bubbles have been removed and a second fluid containing bubbles by forming a swirling flow of the bubble removal target fluid, A bubble increasing device that is housed in a second region surrounding the first region in the housing and that increases the diameter of the bubbles by combining bubbles contained in the second fluid separated by the bubble separating device; The bubble separation device includes an inlet into which the bubble removal target fluid is introduced, a swirl flow converting unit that converts the bubble removal target fluid that has flowed in from the inlet into a swirl flow, and the swirl flow Gradual diameter toward the downstream side of A small first fluid chamber, a narrow tube having one end opened in the first fluid chamber, and a second fluid chamber provided on the downstream side of the first fluid chamber, the bubble increasing The apparatus has a plurality of parallel plates that define a plurality of regions that communicate with each other in the second region, and the second fluid that flows out of the narrow tube is defined by the plurality of parallel plates. The diameter of bubbles contained in the second fluid is increased by sequentially guiding the plurality of regions to the plurality of regions .

  According to the present invention, it is possible to provide a compact device for separating and removing bubbles in a fluid that effectively and efficiently removes bubbles contained in a fluid.

1 is a top view and a side view showing an apparatus for separating and removing bubbles in a fluid according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view showing an example of a bubble separation device used in the fluid bubble separation and removal device shown in FIG. FIG. 3 is a top view and a side view for explaining the operation of the device for separating and removing bubbles in the fluid shown in FIG. FIG. 4 is a diagram for explaining an example of a hydraulic system using the device for separating and removing bubbles in a fluid shown in FIG. FIG. 5 is a diagram for explaining an example of a hydraulic system using the device for separating and removing bubbles in fluid shown in FIG.

  Embodiments of a device for separating and removing bubbles in a fluid according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 shows an apparatus 10 for separating and removing bubbles in a fluid according to the present invention. FIG. 1 (A) is a top view thereof, and FIG. 1 (B) is a side view thereof.

  In FIG. 1, a device 10 for separating and removing bubbles in a fluid according to the present invention is used, for example, to remove bubbles from hydraulic oil of a construction machine or the like, and includes a cylindrical housing H and a center in the housing H. A bubble separating device 110 housed in a first region 100 along the axis and a bubble coupling device 210 formed in a second region 200 surrounding the first region 100 in the housing H are configured. The

  The bubble separation device 110 flows in oil that is a target for removing bubbles, and separates the target oil for removal of bubbles into a first oil from which bubbles have been removed and a second oil that contains bubbles. 110 is provided on the side surface of the housing H in which the bubble removal target oil flows into the bubble separation device 110 in the first region 100, and the upper surface of the housing H is separated by the bubble separation device 110. A discharge port P2 for discharging the first oil from which the bubbles are removed is provided.

  The bubble coupling device 210 has a function of coupling and enlarging each bubble so as to facilitate the removal of the bubbles contained therein, and the second of the housing H in which the bubble coupling device 210 is formed. In the upper portion of the region 200, a discharge port P3 for discharging the third oil containing the enlarged bubbles is provided.

  The bubble separation device 110 forms a swirl flow of the bubble removal target oil that has flowed in from the inlet P1, so that the bubble removal target oil is removed from the first oil from which the bubbles have been removed and the second oil that includes the bubbles. The first oil from which bubbles have been removed is discharged from the discharge port P2, and the second oil containing bubbles is discharged from the discharge port 117 of the bubble separation device 110 into the second region 200. The detailed configuration of the bubble separation device 110 will be described later with reference to FIG.

  The bubble coupling device 210 flows in the second oil containing the bubbles discharged from the discharge port 117 of the bubble separation device 110, and sequentially combines the bubbles contained in the second oil, thereby reducing the diameter of the bubbles. The oil containing the enlarged bubbles is discharged from the discharge port P3.

  Here, the bubble coupling device 210 includes a plurality of parallel plate members 211 that define a plurality of regions 201 to 206 that communicate with each other in the second region 200, and is discharged from the discharge port 117. The second oil sequentially passes through the plurality of passages formed by the plurality of parallel plate members 211 and is sequentially guided to the plurality of regions 201 to 206, thereby sequentially combining the bubbles contained in the second oil, The diameter of the bubbles contained in the oil 2 is increased. The detailed operation of the bubble coupling device 210 will be described in detail later with reference to FIG.

  In FIG. 1, six regions 201 to 206 are defined by five parallel plate members 211, and three parallel plate members 211 are provided in each region 201 to 206, respectively. The number of parallel plate members 211 for forming the plurality of regions and the number of parallel plate members 211 provided in each region can be arbitrarily set according to the bubble coupling effect.

  FIG. 2 is a cross-sectional view showing an example of the bubble separation device 110 used in the bubble separation / removal device 10 shown in FIG.

  The bubble separation device 110 shown in FIG. 2 uses a swirl flow to separate the introduced bubble removal target oil into a first oil from which bubbles are removed and a second oil containing bubbles. A cylindrical swirl flow forming portion 111 is provided at a substantially central portion.

  The swirl flow forming unit 111 is formed with an annular flow channel 112 formed along the periphery of the swirl flow forming unit 111, and the bubble removal target oil that has flowed in from the inflow port P1 is formed in the circular flow channel 112. It flows in from a direction perpendicular to the central axis. Further, the annular flow path 112 is provided with a discharge port 113 through which oil flowing through the circular flow path 112 flows out tangentially to the first fluid chamber 114.

  The first fluid chamber 114 has a truncated cone shape with a gradually decreasing downstream diameter, and a second fluid chamber 115 is connected to the downstream side of the first fluid chamber 114. The downstream side of the second fluid chamber 115 is connected to the discharge port P2.

  Further, in the first fluid chamber 114, a narrow tube 116 having a tip opened in the first fluid chamber 114 is provided along the central axis of the bubble separation device 110. The other end of the narrow tube 116 is connected to the discharge port 117.

  In the bubble separation device 110 configured as described above, the bubble removal target oil that has flowed in from the inflow port P1 flows through the annular flow path 112 of the swirl flow forming unit 111 and flows out of the discharge port 113, whereby the inside of the first fluid chamber 114. Forms a swirling flow of oil.

  Here, since the first fluid chamber 114 has a truncated cone shape whose diameter gradually decreases on the downstream side, the oil that does not contain bubbles due to the centrifugal force generated by the swirl flow is in the first fluid chamber 114. To the peripheral wall side, the bubbles gather near the center of the first fluid chamber 114 as indicated by B in FIG.

  The air bubbles gathered on the center side of the first fluid chamber 114 are discharged through the narrow tube 116 together with a part of the oil in the first fluid chamber 114 by the back pressure applied to the first fluid chamber 114. To be discharged as a second oil containing bubbles.

  Further, the oil in the first fluid chamber 114 from which bubbles are removed by the thin tube 116 is discharged from the discharge port P2 as the first oil from which bubbles are removed via the second fluid chamber 115.

  3 explains the operation of the bubble coupling device 210 used in the fluid bubble separation / removal device 10 shown in FIG. 1, and FIG. 3 (A) is a top view of the fluid bubble separation / removal device 10. FIG. 3B is a side view thereof.

  In FIG. 3, for ease of explanation, four regions 201 to 204 are formed by three parallel plate members 211, and two parallel plate members 211 are provided in each region 201 to 204. Is shown.

  In FIG. 3, the second oil containing the bubbles discharged from the discharge port 117 of the bubble separation device 110 flows into the second region 200 of the bubble coupling device 210 and flows into the second region 200. The second oil containing bubbles is guided to the region 201.

  The oil guided to the region 201 passes between the two parallel plates 211 and is further guided to the region 202.

  Similarly, the oil guided to the region 202 passes between the two parallel plate members 211 and is further guided to the region 203, and the oil guided to the region 203 is between the two parallel plate members 211. And is further led to region 204.

  The oil containing the bubbles sequentially passes between the parallel plate materials 211, and the bubbles contained in the oil roll on the lower surface of each parallel plate material 211, whereby the bubbles contained in the oil are sequentially coupled to each other. And then gradually increase.

  In this way, the bubbles contained in the second oil increase in size, and the oil containing the enlarged bubbles is discharged from the discharge port P3.

Next, an example of a hydraulic system to which the device for separating and removing bubbles in fluid shown in FIG. 1 is applied will be described with reference to FIGS. 4 and 5. FIG. 4 shows the separation and removal of bubbles in fluid shown in FIG. 2 is a diagram illustrating an example of a hydraulic system using the device 10. FIG.

  4 supplies oil stored in the main tank 20 to the hydraulic device 30 by the pump 41, and returns the oil used as hydraulic oil in the hydraulic device 30 to the main tank 20 again. 1 is provided with the separation / removal device 10 for bubbles in a fluid shown in FIG.

  In this type of hydraulic system, bubbles may be mixed in the oil used as the hydraulic oil in the hydraulic device 30 due to various causes such as a rise in the temperature of the hydraulic oil in the hydraulic device 30. Is returned to the main tank 20 as it is.

  As a result, the oil in the main tank 20 has a lot of bubbles. In this case, the rigidity of the hydraulic oil supplied from the main tank 20 to the hydraulic device 30 is reduced, the oxidation deterioration of the hydraulic oil is promoted, and the hydraulic oil It reduces the lubrication characteristics, and further reduces the power transmission characteristics and operating life of the equipment.

  Therefore, in this hydraulic system, a bubble separation / removal circuit provided with the separation / removal device 10 for bubbles in the fluid according to the present invention is provided independently of the main oil circulation path. The air bubbles mixed in the oil in the main tank 20 are effectively and efficiently removed.

  That is, in the hydraulic system shown in FIG. 4, a bubble separation / removal device is used for the oil stored in the main tank 20 by using a pump 42 independent of the pump 41 provided in the main oil circulation path. 10 pressure inlets P1 are supplied under pressure.

  The bubble removal target oil pressure-supplied to the inlet P1 of the bubble separation / removal device 10 is the first oil from which bubbles have been removed by the bubble separation device 110 of the bubble separation / removal device 10 and the second oil containing bubbles. The first oil that has been separated and from which the bubbles separated by the bubble separation device 110 have been removed is returned to the main tank 20 from the discharge port P2 of the bubble separation and removal device 10.

  Further, the second oil containing the bubbles separated by the bubble separation device 110 is guided to the bubble coupling device 210 of the bubble separation and removal device 10, where the bubbles are coupled and become larger due to the coupling. The oil containing bubbles is returned to the main tank 20 from the discharge port P3.

  Here, since the bubbles contained in the oil returned to the main tank 20 from the discharge port P3 are combined and enlarged by the bubble coupling device 210, the bubbles immediately move upward in the main tank 20 and from the breather 21 to the main tank. It is discharged out of the tank 20.

  Therefore, according to this hydraulic system, the bubbles in the main tank 20 can be removed efficiently and quickly.

  FIG. 5 is a diagram for explaining another example of a hydraulic system using the in-fluid bubble separating and removing apparatus 10 shown in FIG.

  5, the oil stored in the main tank 20 is supplied to the hydraulic equipment 30 by the pump 41, and the oil used as the hydraulic oil by the hydraulic equipment 30 is also used in the hydraulic system shown in FIG. The oil circulation path that returns to the main tank 20 is the main oil circulation path, and the bubble separation / removal circuit provided with the bubble separation / removal device 10 according to the present invention is independent of the main oil circulation path. In this hydraulic system, the in-fluid bubble separation and removal device 10 according to the present invention is provided in the main tank 20.

  That is, in the hydraulic system of FIG. 5, the bubble removal target oil in the main tank 20 is pressurized and supplied to the inlet P1 of the bubble separation and removal apparatus 10 in the main tank 20 using the pump 42, and the bubble separation and removal apparatus 10 Are separated into a first oil from which bubbles are removed and a second oil containing bubbles.

  Then, the first oil from which the bubbles separated by the bubble separation device 110 are removed is returned into the main tank 20 from the discharge port P2 of the bubble separation and removal device 10.

  Further, the second oil containing the bubbles separated by the bubble separation device 110 is guided to the bubble coupling device 210 of the bubble separation and removal device 10, where the bubbles are coupled and become larger due to the coupling. The oil containing bubbles is returned to the main tank 20 from the discharge port P3.

  Here, since the bubbles contained in the oil returned to the main tank 20 from the discharge port P3 are combined and enlarged by the bubble coupling device 210, the bubbles immediately move upward in the main tank 20 and from the breather 21 to the main tank. It is discharged out of the tank 20.

  Therefore, even with this hydraulic system, the bubbles in the main tank 20 can be efficiently and quickly removed, and the bubble separation / removal device 10 is provided in the main tank 20. The advantage is that no special space is required.

  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-described embodiment, the case where the circulation / circulation system for removing bubbles in the fluid according to the present invention is applied to a hydraulic system, but the present invention is similarly applied to various other apparatuses and systems that need to remove bubbles in the fluid. Is possible.

DESCRIPTION OF SYMBOLS 10 Separation / removal device for bubbles in fluid 20 Main tank 21 Breather 30 Hydraulic equipment 41 Pump 42 Pump 100 First region 110 Bubble separation device 111 Swirl flow forming portion 112 Ring flow passage 113 Discharge port 114 First fluid chamber 115 Second fluid Fluid chamber 116 Narrow tube 117 Discharge port
200 2nd area 201-206 area 210 Bubble coupling device 211 Parallel plate material H Housing P1 Inflow port P2 Discharge port P3 Discharge port

Claims (1)

A cylindrical housing;
The bubbles are removed from the bubble removal target fluid by being accommodated in the first region along the central axis in the housing, flowing in the bubble removal target fluid, and forming a swirling flow of the bubble removal target fluid. A bubble separation device that separates a first fluid and a second fluid containing bubbles;
A bubble increasing device that is housed in a second region surrounding the first region in the housing and that increases the diameter of the bubble by combining bubbles included in the second fluid separated by the bubble separating device; ,
Equipped with,
The bubble separation device comprises:
An inlet into which the bubble removal target fluid is introduced;
Swirl flow converting means for converting the bubble removal target fluid that has flowed in from the inflow port into a swirl flow;
A first fluid chamber whose diameter gradually decreases toward the downstream side of the swirling flow;
A narrow tube having one end opened in the first fluid chamber;
A second fluid chamber provided downstream of the first fluid chamber;
Comprising
The bubble increasing device includes:
The plurality of parallel plate members defining a plurality of regions communicating with each other in the second region, and the plurality of the second fluids flowing out from the thin tubes are defined by the plurality of parallel plate members. An apparatus for separating and removing bubbles in a fluid, wherein the bubbles in the second fluid are increased in diameter by being sequentially guided to a region .

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