CN110043534B - Visual experiment device and method for bubble flowing and bubble removal in hydraulic system - Google Patents
Visual experiment device and method for bubble flowing and bubble removal in hydraulic system Download PDFInfo
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- CN110043534B CN110043534B CN201910352965.XA CN201910352965A CN110043534B CN 110043534 B CN110043534 B CN 110043534B CN 201910352965 A CN201910352965 A CN 201910352965A CN 110043534 B CN110043534 B CN 110043534B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/047—Preventing foaming, churning or cavitation
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Abstract
A visual experiment device and method for bubble flowing and bubble removal in a hydraulic system are characterized in that a high-speed camera and a laser sheet light source are mounted on a freely movable support, and the high-speed camera and the laser sheet light source can be adjusted at will and move freely. The transparent oil tank is fixed on the oil tank support, and the outlet of the transparent oil tank is connected with the transparent oil absorption square pipe. And after passing through the pump and the reversing valve, the hydraulic oil flows back to the oil tank through the hydraulic hose, and one part of the hydraulic hose, which is close to the oil tank, is connected with the transparent oil return port. The method comprises the steps of visualizing bubble flow and bubble removal in a hydraulic system, wherein the bubble flow visualization method is used for recording bubble images shot by a high-speed camera and reading pressure measurement values of all positions; the visualization method for removing bubbles is to install two filter screens in an oil tank, and adjust the included angle between the filter screens and the horizontal plane to be 90 degrees; recording bubble images shot by a high-speed camera, and reading pressure measurement values of all positions; and adjusting the included angle between the filter screen and the horizontal plane to be 45 degrees, repeating the steps, and shooting and storing images through a high-speed camera.
Description
Technical Field
The device relates to a hydraulic technology, in particular to a bubble flow visualization and bubble removal technology in a hydraulic system.
Background
The cleanness of oil in a hydraulic system is an important factor for ensuring the reliable, stable and safe operation of the system, and bubbles are important indexes for influencing the cleanliness of the oil. When the system works in practice, a certain amount of air is mixed into hydraulic oil due to various reasons, so that the response characteristic of the system is poor, hydraulic shock, vibration and noise are caused, a cavitation phenomenon is generated, and the surface damage of a hydraulic element is aggravated. With the wide application of high-speed cameras in the research fields, flow visualization becomes an important way for researching the problems, but because an oil tank, a hydraulic pipeline and hydraulic elements in a traditional experimental device are all opaque, visualization cannot be realized; the experimental device has a fixed structure, and the observable area is relatively single; interchangeability between various degassing devices is not high and thus has significant limitations.
Disclosure of Invention
The invention aims to provide a visual experiment device and method for bubble flowing and bubble removal in a hydraulic system.
The invention discloses a visual experiment device for bubble flowing and bubble removing in a hydraulic system, which consists of an oil return pipe support 5, a transparent oil tank 9, a transparent oil absorption square pipe 10, a first hydraulic hose 11, a second hydraulic hose 26, a freely movable support 111, a pump 7, a third hydraulic hose 13, a pressure gauge 15, a three-phase asynchronous motor 22, an overflow valve 8, a reversing valve 18, a load 11, a laser sheet light source 16, a high-speed camera 17, a transparent oil return square pipe 19, a system transparent square pipe 24, a hydraulic hose 25 and pressure sensors 27a,27b,27c and 27 d. The method is characterized in that: the transparent oil tank 9 is a square transparent container with a bottom opening, hydraulic oil is added and then placed on the oil tank support 20, the transparent oil tank 9 is connected to a hydraulic system through a transparent oil-absorbing square pipe 10, the hydraulic oil flows back to the transparent oil tank 9 through a transparent oil-returning square pipe 19, a square oil outlet is formed in the lower portion of the transparent oil tank 9, and the transparent oil-absorbing square pipe 10 is communicated with the transparent oil tank 9 through the square oil outlet; 4 pressure sensors 27 are arranged on the transparent oil absorption square pipe 10, one end of each pressure sensor 27 extends into the transparent oil absorption square pipe 10, the other end of each pressure sensor 27 reads a pressure value through a conducting wire, and the connection part of each pressure sensor 27 and the transparent oil absorption square pipe 10 is completely sealed; the transparent oil absorption square pipe 10 is connected with a pump 7, and the pump 7 is connected with a three-phase asynchronous motor 6 through a coupler 22; the pump 7 is connected with the manifold block 23 through a hydraulic fourth hydraulic hose 25, and a pressure gauge 15 is arranged on the fourth hydraulic hose 25 to measure the pressure at the outlet; the reversing valve 18, the overflow valve 8 and the system transparent square tube 24 are respectively fixed on the integrated block 23 through bolts; the load 11 and the manifold block 23 are connected through a first hydraulic hose 12 and a second hydraulic hose 26; the transparent oil return square pipe 19 is connected with a system transparent square pipe 24 through a third hydraulic hose 13, and the transparent oil return square pipe 19 is fixedly connected to the free moving support 1h through bolts; the high-speed camera 17 is fixed on the high-speed camera support 3, the laser sheet light source 16 is connected with the laser sheet light source support 2c, and the laser sheet light source support 2c is connected with the sliding guide rail 1 e; the screens 20a and 20b are fixed in the transparent oil tank 9 in an inclined manner with respect to the horizontal plane, and the angle can be freely adjusted.
The bubble flow and bubble removal visualization method of the visualization experiment device for bubble flow and bubble removal in the hydraulic system is adopted, and the bubble flow visualization method comprises the following steps:
(1) turning on the high-speed camera 17 and adjusting to the position to be observed;
(2) turning on the laser sheet light source 16 and adjusting to the upper part of the position to be observed;
(3) the power supply of the motor 6 is switched on, so that the hydraulic system starts to work;
(4) the bubble image shot by the high-speed camera 17 is recorded, the pressure measurement value of each position is read, and the bubble generation and movement rules can be analyzed through the picture obtained through high-speed shooting.
The bubble removal visualization method comprises the following steps:
(1) two filter screens 20a and 20b are arranged in the oil tank, and the included angle between each filter screen 20a and 20b and the horizontal plane is adjusted to be 90 degrees;
(2) turning on the high-speed camera 17 and adjusting to the position to be observed;
(3) turning on the laser sheet light source 16 and adjusting to the upper part of the position to be observed;
(4) the power supply of the motor 6 is switched on, so that the hydraulic system works normally;
(5) recording bubble images shot by a high-speed camera, and reading pressure measurement values of all positions;
(6) changing the aperture of the filter screen in the step (1) and the included angle between the filter screen and the horizontal plane to 45 degrees, repeating the steps (2) - (5), and shooting and storing images through a high-speed camera 17.
The invention has the beneficial effects that: 1. the experimental data is accurate. The high-speed camera 17 can shoot images more clearly than a common camera, and the bubble flowing process is more accurate; the cross sections of the oil suction pipe 10 and the transparent oil return pipe 19 of the oil tank are square, so that the deformation caused by light refraction is avoided, and the acquisition result of the bubble image is closer to the reality. 2. The experimental device is flexible and has wide observation range. The position of the laser source 16 can be adjusted arbitrarily, so as to conveniently illuminate any visual area. The high-speed camera 17 can slide on the slide rail 1 in various directions, and can observe the flow of bubbles at any position. 4. High interchangeability and wide application range. The position of the oil return pipe opening 19 can be adjusted at will, and the working requirements under different conditions can be conveniently met. The overflow valve 8, the reversing valve 9 and the load 11 can be replaced by other hydraulic actuators at will, and other elements can be detected. The filter screens 20a and 20b are flexibly arranged and can be arranged at any angle; the replacement is convenient, the filter screen with any aperture can be replaced, and other degassing devices can also be replaced.
Drawings
Fig. 1 is a structural diagram of the device of the present invention, fig. 2 is a system schematic diagram of the device of the present invention, fig. 3 is a sliding guide rail bracket of the present invention, fig. 4 is a structural schematic diagram of a transparent oil absorption square tube 10 of the present invention, fig. 5 is a structural schematic diagram of a transparent oil return square tube 19 of the present invention, fig. 6 is a structural schematic diagram of a system transparent square tube 24 of the present invention, fig. 7 is pressure sensors 27a,27b,27c,27d arranged on the transparent oil absorption square tube 10 of the present invention, fig. 8 is a connection sealing manner of the transparent oil return square tube 19 and a hydraulic hose 13 of the present invention, and fig. 9 is a connection sealing manner of a transparent oil tank 9 and the transparent oil absorption square tube.
The reference numbers and corresponding designations in the drawings are: the hydraulic system comprises a sliding guide rail frame 111, sliding guide rails 1a, 1b, 1c, 1d, 1e, 1f, 1g, 1h, 1I and 1j, sliders 2a, 2b, 2c, 2d, 2e, 2f, 2g, 2h, 2I and 2j, an oil return pipe flange 5, a three-phase asynchronous motor 6, a pump 7, an overflow valve 8, a transparent oil tank 9, a transparent oil absorption square pipe 10, a load 11, a first hydraulic hose 12, a third hydraulic hose 13, a hydraulic gauge 15, a laser sheet light source 16, a high-speed camera 17, a reversing valve 18, a transparent oil return square pipe 19, filter screens 20a and 20b, a coupler 22, an integrated block 23, a system transparent square pipe 24, a fourth hydraulic hose 25, a second hydraulic hose 26, pressure sensors 27a,27b,27c and 27d, an O-shaped sealing ring 28, a square hole 29, an acrylic flange 30, an acrylic flange 31, an O-shaped sealing ring 32, a square nut 33a, 33b, 33c, 33 d.
Detailed Description
As shown in fig. 1 to 9, the visual experiment device for bubble flow and bubble removal in a hydraulic system of the present invention is composed of an oil return pipe support 5, a transparent oil tank 9, a transparent oil absorption square pipe 10, a first hydraulic hose 11, a second hydraulic hose 26, a freely movable support 111, a pump 7, a third hydraulic hose 13, a pressure gauge 15, a three-phase asynchronous motor 22, an overflow valve 8, a reversing valve 18, a load 11, a laser sheet light source 16, a high-speed camera 17, a transparent oil return square pipe 19, a system transparent square pipe 24, a hydraulic hose 25, and pressure sensors 27a,27b,27c, and 27 d. The transparent oil tank 9 is a square transparent container with a bottom opening, hydraulic oil is added and then placed on the oil tank support 20, the transparent oil tank 9 is connected to a hydraulic system through a transparent oil-absorbing square pipe 10, the hydraulic oil flows back to the transparent oil tank 9 through a transparent oil-returning square pipe 19, a square oil outlet is formed in the lower portion of the transparent oil tank 9, and the transparent oil-absorbing square pipe 10 is communicated with the transparent oil tank 9 through the square oil outlet; 4 pressure sensors 27a,27b,27c and 27d are arranged on the transparent oil absorption square pipe 10, one ends of the pressure sensors 27a,27b,27c and 27d extend into the transparent oil absorption square pipe 10, the other ends read pressure values through conducting wires, and the joints of the pressure sensors 27a,27b,27c and 27d and the transparent oil absorption square pipe 10 are completely sealed; the transparent oil absorption square pipe 10 is connected with a pump 7, and the pump 7 is connected with a three-phase asynchronous motor 6 through a coupler 22; the pump 7 is connected with the manifold block 23 through a hydraulic hose 25, and a pressure gauge 15 is arranged on the hydraulic hose to measure the pressure at the outlet; the reversing valve 18, the overflow valve 8 and the system transparent square tube 24 are respectively fixed on the integrated block 23 through bolts; the load 11 is connected with the manifold 23 through the hose 12 and the hose 26; the transparent oil return square pipe 19 is connected with a system transparent square pipe 24 through a hydraulic hose 13, and the transparent oil return square pipe 19 is fixedly connected with the freely movable support 1h through a bolt; the high-speed camera 17 is fixed on the high-speed camera support 3, the laser sheet light source 16 is connected with the laser sheet light source support 2c, and the laser sheet light source support 2c is connected with the sliding guide rail 1 e; the screens 20a and 20b are fixed in the transparent oil tank 9 in an inclined manner with respect to the horizontal plane, and the angle can be freely adjusted.
As shown in fig. 1 to 9, a slide guide 1a and a slide guide 1b are arranged in parallel, a slide guide 1c is arranged in parallel, the slide guide 1a is vertical to a horizontal plane and is connected with a slide block 2a and a slide block 2c, and the slide guide 1c freely slides along the directions of the slide guide 1a and the slide guide 1 b; the sliding guide rail 1d is perpendicular to the sliding guide rail 1c, is connected through the sliding block 2b and can freely move along the direction of the sliding guide rail 1 c; the sliding guide rails 1g and 1f are perpendicular to the sliding guide rails 1a and 1b and connected through the sliding blocks 2a and 2c, and the sliding guide rails 1g and 1f can freely slide along the directions of the sliding guide rails 1a and 1 b; the sliding guide rail 1e is perpendicular to the sliding guide rails 1g and 1f and is connected with the sliding block 2d through the sliding block 2e, and the sliding guide rails 1g and 1f can freely slide along the vertical direction; the sliding guide rail 1j is parallel to the sliding guide rail 1c, the sliding guide rail 1i is perpendicular to the sliding guide rail 1j and is connected through a sliding block 2g, and the sliding guide rail 1i can freely slide along the sliding guide rail 1 j; the sliding guide rail 1h is perpendicular to the sliding guide rail 1i and connected through the slider 2h, and the sliding guide rail 1h can freely slide along the sliding guide rail 1 i.
As shown in fig. 1, 4, 5 and 6, the transparent oil absorption square pipe 10 and the transparent oil return square pipe 19 have a square cross section, and both ends of the transparent square pipe 24 are in a square flange structure, and 4 holes are arranged at four corners of the square flange.
As shown in fig. 1, 7 and 9, 4 pressure sensors 27a,27b,27c and 27d are uniformly distributed on the transparent oil absorption square tube 10 along the oil flow direction, and the relative positions are equal. The pressure sensor is positioned on the pipe wall below the transparent oil absorption square pipe 10.
As shown in fig. 1 and 8, the transparent oil return square pipe 19 is connected with the oil return pipeline 13 through a metal flange 5 and 4 metal bolts, and is sealed by an o-shaped sealing ring 28.
As shown in fig. 1 and 9, the outlet square hole 29 of the transparent oil tank 9 is connected with the transparent oil absorption square pipe 10 through an acrylic flange and a metal bolt, and is sealed by an o-shaped sealing ring 32. 4 square nuts are fixed on the wall surface of an oil outlet of the oil tank, the square nuts are fixed by acrylic flanges 30 and 31 which are provided with middle square flow channels and nut holes, and the square nuts are compressed and sealed by four bolts.
As shown in fig. 1 to 9, the bubble flow and bubble removal visualization method using the above visualization experiment apparatus for bubble flow and bubble removal in a hydraulic system includes the following steps:
(1) turning on the high-speed camera 17 and adjusting to the position to be observed;
(2) turning on the laser sheet light source 16 and adjusting to the upper part of the position to be observed;
(3) the power supply of the motor 6 is switched on, so that the hydraulic system starts to work;
(4) the bubble image shot by the high-speed camera 17 is recorded, the pressure measurement value of each position is read, and the bubble generation and movement rules can be analyzed through the picture obtained through high-speed shooting.
The bubble removal visualization method comprises the following steps:
(1) two filter screens 20a and 20b are arranged in the oil tank, and the included angle between each filter screen 20a and 20b and the horizontal plane is adjusted to be 90 degrees;
(2) turning on the high-speed camera 17 and adjusting to the position to be observed;
(3) turning on the laser sheet light source 16 and adjusting to the upper part of the position to be observed;
(4) the power supply of the motor 6 is switched on, so that the hydraulic system works normally;
(5) recording bubble images shot by a high-speed camera, and reading pressure measurement values of all positions;
(6) changing the aperture of the filter screen in the step (1) and the included angle between the filter screen and the horizontal plane to 45 degrees, repeating the steps (2) - (5), and shooting and storing images through a high-speed camera 17.
In order to make the technical scheme and characteristics of the embodiment of the invention more clear, the following detailed description of the implementation process of the invention is combined with the accompanying drawings.
Example 1: visual experiment of bubble flow at the oil suction pipe opening:
as shown in fig. 1, the position of the laser sheet light source 16 is adjusted to the right above the transparent oil absorption square pipe 10 left and right and up and down by the freely adjustable sliding guide rail bracket 111, and the position of the high speed camera 17 is adjusted to be in the same straight line with the laser sheet light source 16, so that the transparent oil absorption square pipe 10 can be clearly shot. When the reversing valve 18 is in the neutral position, under the action of the hydraulic pump 7, the hydraulic oil flows into the reversing valve 18, the system transparent pipeline 24 and the transparent oil return pipe 19 through the oil absorption square pipe and then flows into the transparent oil tank 9. During this period, the high-speed camera 17 and the laser sheet light source 16 are operated in cooperation, and the flow characteristics of the bubbles at the position of the suction pipe port are observed and recorded, and the image captured by the high-speed camera is stored.
Example 2: visual experiment of bubble flow at the oil suction pipe opening:
as shown in fig. 1, the position of the laser light source 16 is adjusted to the right front of the transparent oil tank 9, and the position of the high-speed camera 17 is adjusted to be at the same height with the transparent oil tank 9, and the front and the back are adjusted to clearly shoot the inside of the transparent oil tank 9 by the freely adjusted sliding guide rail bracket 111. The reversing valve 18 is moved to the left, the load 11 is adjusted to be larger than the set value of the overflow valve 8, at the moment, the hydraulic oil flows through the overflow valve 8, the system transparent pipeline 24 and the transparent oil return pipe 19 and then returns to the transparent oil tank 9, and the image shot by the high-speed camera is stored.
Example 3: visual experiment of filter screen debubbling:
as shown in fig. 1, after the strainers 20a, 20b are added to the tank, the strainers are adjusted to an angle of 45 °, and the subsequent steps are performed according to the steps of example 1.
Claims (6)
1. Visual experimental apparatus that bubble flow and remove bubble in hydraulic system, including transparent oil tank (9), transparent oil absorption side pipe (10), free movable support (111), pump (7), three-phase asynchronous motor (22), overflow valve (8), switching-over valve (18), load (11), laser sheet light source (16), high-speed camera (17), transparent oil return side pipe (19), its characterized in that: the transparent oil tank (9) is a square transparent container with a bottom opening, hydraulic oil is added and then placed on the oil tank support (20), the transparent oil tank (9) is connected to a hydraulic system through a transparent oil-absorbing square pipe (10), the hydraulic oil flows back to the transparent oil tank (9) through a transparent oil-returning square pipe (19), a square oil outlet is formed in the lower portion of the transparent oil tank (9), and the transparent oil-absorbing square pipe (10) is communicated with the transparent oil tank (9) through the square oil outlet; 4 pressure sensors (27) are arranged on the transparent oil absorption square pipe (10), one ends of the pressure sensors (27 a,27b,27c and 27 d) extend into the transparent oil absorption square pipe (10), the other ends read pressure values through conducting wires, and the joints of the pressure sensors (27 a,27b,27c and 27 d) and the transparent oil absorption square pipe (10) are completely sealed; the transparent oil absorption square pipe (10) is connected with a pump (7), and the pump (7) is connected with a three-phase asynchronous motor (6) through a coupler (22); the pump (7) is connected with the manifold block (23) through a hydraulic hose (25), and a pressure gauge (15) is arranged on the hydraulic hose to measure the pressure of an outlet; the reversing valve (18), the overflow valve (8) and the system transparent square tube (24) are respectively fixed on the integrated block (23) through bolts; the load (11) is connected with the manifold block (23) through a first hydraulic hose (12) and a second hydraulic hose (26); the transparent oil return square pipe (19) is connected with a system transparent square pipe (24) through a third hydraulic hose (13), and the transparent oil return square pipe (19) is fixed on the free moving support 1 (h) through bolt connection; the high-speed camera (17) is fixed on the high-speed camera support (3), the laser sheet light source (16) is connected with the laser sheet light source support (2 c), and the laser sheet light source support (2 c) is connected with the sliding guide rail (1 e); the filter screens (20 a, 20 b) are obliquely fixed in the transparent oil tank (9) with the horizontal plane, and the angle can be freely adjusted.
2. The visual experiment device for bubble flow and bubble removal in a hydraulic system according to claim 1, is characterized in that: the sliding guide rail (1 a) and the sliding guide rail (1 b) are arranged in parallel, the sliding guide rail (1 a) of the sliding guide rail (1 c) is vertical to the horizontal plane and is connected with the sliding block (2 c) through the sliding block (2 a), and the sliding guide rail (1 c) freely slides along the directions of the sliding guide rail (1 a) and the sliding guide rail (1 b); the sliding guide rail (1 d) is vertical to the sliding guide rail (1 c), is connected through a sliding block (2 b), and can freely move along the direction of the sliding guide rail (1 c); the sliding guide rails (1 g, 1 f) are perpendicular to the sliding guide rails (1 a, 1 b) and are connected through sliding blocks (2 a,2 c), and the sliding guide rails (1 g, 1 f) can freely slide along the direction of the sliding guide rails (1 a, 1 b); the sliding guide rail (1 e) is vertical to the sliding guide rails (1 g, 1 f) and is connected with the sliding block (2 d) through the sliding block (2 e), and the sliding guide rails (1 g, 1 f) can freely slide along the vertical direction; the sliding guide rail (1 j) is parallel to the sliding guide rail (1 c), the sliding guide rail (1 i) is perpendicular to the sliding guide rail (1 j) and is connected through a sliding block (2 g), and the sliding guide rail (1 i) can freely slide along the sliding guide rail (1 j); the sliding guide rail (1 h) is perpendicular to the sliding guide rail (1 i) and is connected with the sliding guide rail (1 i) through a sliding block (2 h), and the sliding guide rail (1 h) can freely slide along the sliding guide rail (1 i).
3. The visual experiment device for bubble flow and bubble removal in a hydraulic system according to claim 1, is characterized in that: transparent oil absorption side's pipe (10), transparent oil return side's pipe (19), the cross section of system transparent side's pipe (24) is the square, and both ends all are the structure of a square flange, and 4 holes are arranged at four angles of square flange.
4. The visual experiment device for bubble flowing and bubble removing in the hydraulic system according to claim 1, wherein 4 pressure sensors (27) are uniformly distributed on the transparent oil absorption square pipe (10) along the oil flowing direction, and the relative positions of the pressure sensors (27 a,27b,27c,27 d) are equal; the pressure sensor is positioned on the pipe wall below the transparent oil absorption square pipe (10).
5. The visual experiment device for bubble flow and bubble removal in the hydraulic system according to claim 1, wherein the transparent oil return square pipe (19) is connected with the oil return pipeline (13) through a metal flange (5) and 4 metal bolts, and is sealed by an o-shaped sealing ring (28).
6. The visual experiment device for bubble flow and bubble removal in the hydraulic system according to claim 1, wherein the outlet square hole (29) of the transparent oil tank (9) is connected with the transparent oil absorption square pipe (10) through an acrylic flange and a metal bolt, and is sealed by an o-shaped sealing ring (32); 4 square nuts are fixed on the wall surface of an oil outlet of the oil tank, the square nuts are fixed by acrylic flanges (30, 31) provided with middle square flow channels and nut holes, and the square nuts are compressed and sealed by four bolts.
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| CN106979149A (en) * | 2017-03-09 | 2017-07-25 | 同济大学 | Simulate the visual experimental apparatus of the conventional plunger pump characteristics of motion and cavitation phenomenon |
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