CN107978214B

CN107978214B - Automatic gas-mixing oil flow line display device and automatic gas-mixing method

Info

Publication number: CN107978214B
Application number: CN201711450599.9A
Authority: CN
Inventors: 李春华
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2017-12-27
Filing date: 2017-12-27
Publication date: 2020-01-31
Anticipated expiration: 2037-12-27
Also published as: CN107978214A

Abstract

The invention provides automatic aeration oil streamline display device and automatic aeration method, the device includes oil tank, aeration device and demonstration disc, the two ends of the demonstration disc are equipped with oil inlet tank and oil return tank respectively, the outlet of the oil tank is connected with the aeration device through connecting pipe, the connecting pipe is equipped with oil pump, the aeration device is connected with the oil inlet tank through the oil inlet pipe, side of the oil inlet tank near the demonstration disc is equipped with flow guide grid, the oil return tank is connected with the inlet of the oil tank through the oil return pipe, the aeration device includes base and liquid-passing pipe with negative pressure cavity inside, the base is equipped with diffusion pipe, the base is also connected with air inlet pipe, the end of liquid-passing pipe is connected with the connecting pipe, the other end of liquid-passing pipe is extended into the negative pressure cavity.

Description

Automatic gas-mixing oil flow line display device and automatic gas-mixing method

Technical Field

The invention belongs to the technical field of experimental teaching demonstration equipment, and particularly relates to an automatic aeration oil flow line display device and an automatic aeration method.

Background

At present, aiming at the fluid flow phenomenon, only by writing on books and language description of teachers, students often feel abstract and are difficult to understand, so in order to clearly demonstrate and observe the fluid flow phenomenon and the flow process and reflect the basic rule and the basic characteristics of fluid motion, experimental teaching demonstration devices capable of visually and vividly displaying various flow phenomena, streamlines, traces, application thereof in engineering, such as columns, wings, column group circumfluence and the like in the 'hydraulics' and 'hydrodynamics' classes are urgently needed to be developed.

The prior demonstration aiming at the streamline, the trace and the flow spectrum has the most common methods such as a smoke wind tunnel method, a hydrogen bubble method and the like, wherein the smoke wind tunnel method introduces smoke into clean air, the flow pattern of the smoke flow in the air can be observed by naked eyes, the hydrogen bubble method adopts an electrochemical method to display the streamline, the two streamline display devices are of a closed structure, the gas generation is not uniform, the bubble is unstable, the flow display is not clear, the display effect is poor, the display of flow images such as the boundary layer separation and the vortex flow generation region and shape can not be realized, particularly, the display of the flow image such as the distortion phenomenon of the streamline and the vortex, dead zone and the like caused by sudden expansion and sudden contraction of a test piece can not be realized, and the practicability is not realized.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides automatic aeration oil streamline display devices and automatic aeration methods, which can provide stable and uniform bubbles, clearly show the oil flowing state, and enable students to deepen the understanding and comprehension of the basic rules of fluid movement so as to enhance the learning interest and improve the teaching quality.

Therefore, through the demonstration of oil flow, students can deepen the understanding and comprehension of the basic rules of fluid movement so as to enhance the learning interest and improve the teaching quality.

The specific technical scheme of the invention is as follows:

the invention provides an automatic gas-mixing oil streamline display device, which comprises an oil tank, an aeration device and a transparent demonstration disc, wherein two ends of the demonstration disc are respectively provided with an oil inlet groove and an oil return groove, the outlet of the oil tank is connected with the aeration device through a connecting pipe, an oil pump is arranged on the connecting pipe, the aeration device is connected with the oil inlet groove through an oil inlet pipe, the side of the oil inlet groove close to the demonstration disc is provided with a flow guide grid, the oil return groove is connected with the inlet of the oil tank through an oil return pipe,

wherein, the aeration device including inside be equipped with the negative pressure chamber the base and with base side threaded connection lead to the liquid pipe, keep away from on the base lead to end of liquid pipe be equipped with the diffusion tube of negative pressure chamber intercommunication, the diffusion tube is connected with end in addition the oil inlet pipe, still be connected with on the base with the intake pipe of negative pressure chamber intercommunication, lead to liquid pipe end with the connecting pipe is connected, lead to liquid pipe end in addition and stretch into to in the negative pressure chamber, the diameter of leading to the liquid pipe is by being close to end to keeping away from the connecting pipe end of connecting pipe reduces gradually.

, the liquid passing pipe comprises a through pipe and a liquid spraying pipe, two ends of the through pipe are respectively connected with the liquid spraying pipe and the connecting pipe, the base is provided with a threaded hole, the through pipe is provided with an external thread matched with the threaded hole, the through pipe is in threaded connection with the base through the threaded hole, the end of the liquid spraying pipe, which is far away from the through pipe, extends into the negative pressure cavity, the diameter of the liquid spraying pipe is gradually reduced from the end, which is close to the through pipe, to the end, which is far away from the through pipe, the end of the liquid spraying pipe is provided with a wafer for sealing the pipe orifice, and the wafer is provided with a through hole with the diameter of 1.

, mixed oil is stored in the oil tank, and the mixed oil is formed by mixing hydraulic oil and transformer oil in a weight ratio of 1: 2.

, the device further comprises a rack, the demonstration disc is fixed on the rack, a black lining plate fixed on the rack is arranged at the bottom of the demonstration disc, the distance between the black lining plate and the bottom of the demonstration disc is 6-15cm, and tube lamps are arranged on two side walls of the demonstration disc.

Preferably, the distance between the black lining plate and the bottom of the demonstration disc is 10 cm.

, wherein the inside of the oil inlet groove is in a step shape and is divided into a high-order groove and a low-order groove, the flow guide grid is arranged on the high-order groove and is communicated with the oil flow line demonstration disc, the low-order groove is provided with a flow stabilizing device, the flow stabilizing device comprises a flow stabilizing pipe which is arranged at the bottom of the low-order groove and is communicated with the oil inlet pipe, and the flow stabilizing pipe is provided with a plurality of liquid holes;

the flow guide grid is in a triangular wave-shaped structure formed by connecting a plurality of flow guide plates end to end; a gap is arranged at the joint of the end parts of two adjacent guide plates close to the demonstration disc; the end parts of two adjacent guide plates far away from the demonstration disc are tightly connected.

, a flow regulating valve is arranged on the oil inlet pipe.

, arranging a gradient adjusting bracket at the bottom of the end of the demonstration disc close to the oil inlet tank, wherein the gradient adjusting bracket comprises two support plates and a lifting support connected between the two support plates, the lifting support comprises telescopic connecting rod assemblies which are symmetrically arranged from left to right, symmetrical free ends of the two telescopic connecting rod assemblies are hinged through cross rods, threaded holes are symmetrically formed in the two cross rods which are positioned in the middle of the telescopic connecting rod assemblies, screw rods penetrate through the threaded holes, and external threads in opposite directions to the internal threads of the threaded holes are arranged at two ends of each screw rod;

the two ends of cross rods are fixedly connected with the edges of the two sides of the supporting plate, the two ends of cross rods are connected with slide blocks, the edge of the supporting plate is provided with a strip-shaped sliding hole along the length direction of the supporting plate, and the slide blocks are clamped in the strip-shaped sliding holes and can slide along the strip-shaped sliding holes;

the telescopic connecting rod assembly comprises at least two crossed parts, the end parts of the adjacent crossed parts are hinged, and the crossed parts are formed by hinging the middle parts of two supporting rods.

Preferably, at least model test pieces are arranged on the oil flow line demonstration disc, and the cross sections of the model test pieces are of square, round, wing-shaped and pentagonal.

The invention also provides an automatic aeration method of the automatic aeration oil streamline display device, which is characterized by comprising the following steps:

s1, firstly, pumping out mixed oil in an oil tank by an oil pump, and enabling the mixed oil to enter a through pipe at high pressure;

s2, then, enabling the mixed oil to enter the liquid spraying pipe from the through pipe at a high speed, and spraying the mixed oil into the negative pressure cavity from a port of the liquid spraying pipe;

and S3, finally, generating negative pressure in the negative pressure cavity by the high-speed power mixed oil, sucking air in the negative pressure cavity through an air inlet pipe, violently mixing the air and the mixed oil to form oil bubbles, and discharging the oil bubbles to the oil inlet pipe through the diffusion pipe.

The oil flow line display device has the beneficial effects that the oil flow line display device has more ideal aeration effect, stable and uniform bubbles, can vividly and intuitively reflect the motion rule and characteristics of the fluid, deepens the understanding of students on the concept and the property of flow lines and traces, and enables the students to know the flow phenomenon and the flow process when the liquid flows around different objects, the design of the device can enhance the learning interest of the students, and simultaneously improves the teaching quality of teachers, and the application range of the device is , so that the device can be widely applied to experimental teaching in the fields of chemical principles, environmental engineering, chemical process, water supply and drainage engineering, thermodynamic engineering, biological engineering and the like.

Drawings

FIG. 1 is a block diagram of the kinds of automatic blending gas oil flow line display devices in embodiment 1;

FIG. 2 is a sectional view showing the construction of an aerator in the automatic aerator oil flow line display device according to example 1;

FIG. 3 is a sectional view showing the structure of a liquid passing tube in the aeration apparatus of the kinds of automatic aeration oil flow line display apparatuses according to example 1;

FIG. 4 is a perspective view of the structure of kinds of automatic blending gas oil flow line display devices in example 2;

FIG. 5 is a top view of the oil sumps in the automatic aerated oil flow line display device in example 3;

FIG. 6 is a side view of an oil feed groove of the automatic aerated oil flow line display device according to example 3;

FIG. 7 is a perspective view showing a slope adjusting bracket of the automatic aerated oil flow line display device according to example 4;

FIG. 8 is a flowchart of an automatic aeration method of automatic aeration oil flow line display devices according to example 6;

FIG. 9 is a flow chart of a model specimen having a cross section of a single airfoil shape according to example 5 at a zero angle (flat slope);

FIG. 10 is a flow chart showing sudden shrinkage and sudden expansion of the model test piece according to example 5;

FIG. 11 is a flow chart of a model test piece of example 5 having a square cross section at zero angle (flat slope);

FIG. 12 is a flow chart of a model test piece having a rhombic cross section in example 5 at zero angle (flat slope);

FIG. 13 is a flow chart of a model specimen having a pointed square tail in cross section according to example 5 at zero angle (flat slope);

FIG. 14 is a flow chart of a model specimen having a square head, a pointed tip and a tail in cross section according to example 5 at a zero angle (flat slope);

FIG. 15 is a flow chart of the test piece of the double cylinder type with a circular cross section according to example 5 with turbulence at zero angle (flat slope);

FIG. 16 is a flow chart of a cylindrical row model test piece with a circular cross section according to example 5, with zero angle (flat slope) of flow around;

FIG. 17 is a flow chart of a cylindrical cluster model specimen of example 5 having a circular cross section with zero angle (flat slope) of flow around;

FIG. 18 is a flow chart of a model test piece (flat slope) having a circular cross section according to example 5 at a height of 6 cm;

FIG. 19 is a flow chart of a model test piece (flat slope) having a circular cross section according to example 5 at a height of 8 cm.

Wherein: 1. an oil tank; 2. an aeration device; 21. a negative pressure chamber; 22. a base; 23. a liquid pipe is communicated; 231. pipe passing; 232. a liquid spraying pipe; 233. a wafer; 234. a through hole; 24. a diffuser tube; 25. an air inlet pipe; 3. a demonstration disc; 4. an oil inlet groove; 5. an oil return groove; 6. a connecting pipe; 7. an oil pump; 8. an oil inlet pipe; 9. a flow guiding grid; 91. a baffle; 92. a gap; 10. an oil return pipe; 11. a rack; 12. a black liner plate; 13. a lamp tube; 14. a flow stabilizer; 141. a flow stabilizing pipe; 142. a flow stabilizer; 143. an oil outlet; 15. a flow regulating valve; 16. a slope adjustment bracket; 161. a support plate; 162. a telescopic link assembly; 163. a cross bar; 164. a lead screw; 165. a slider; 166. a strip-shaped slide hole.

Detailed Description

The invention is further illustrated in detail in connection with the following examples and the figures.

Example 1

As shown in fig. 1, an embodiment 1 of the present invention provides kinds of automatic aerated oil streamline display devices, which can be used for providing stable and uniform bubbles and clearly showing the flowing state of oil, so that students can deepen the understanding and comprehension of the basic rules of fluid movement, specifically, the device includes an oil tank 1, an aeration device 2 and a transparent demonstration disc 3, oil liquid is stored in the oil tank 1, an oil inlet tank 4 and an oil return tank 5 are respectively arranged at two ends of the demonstration disc 3, the oil inlet tank 4 provides the treated oil bubbles for the demonstration disc 3, the oil return tank 5 is used for collecting the oil liquid on the demonstration disc 3, an outlet of the oil tank 1 is connected with the aeration device 2 through a connecting pipe 6, the aeration device 2 is used for generating the oil bubbles, an oil pump 7 is arranged on the connecting pipe 6, the oil pump 7 can pump the oil into the aeration device 2 at a high speed, the aeration device 2 is connected with the oil inlet tank 4 through an oil inlet pipe 8, a stream guidance grid 9 is arranged on a side of the oil inlet tank 4 close to the demonstration disc 3, the oil return tank 5 is connected with an inlet of the oil tank 1 through an oil return pipe 10, and the stream.

As shown in fig. 2, the aerator 2 includes a base 22 having a negative pressure chamber 21 therein and a liquid pipe 23 connected to the base 22 through threads, a diffusing pipe 24 connected to the negative pressure chamber 21 is disposed at a end of the base 22 far from the liquid pipe 23, the diffusing pipe 24 is connected to the end, the base 22 is further connected to an air inlet pipe 25 connected to the negative pressure chamber 21, the liquid pipe 23 end is connected to the connecting pipe 6, the liquid pipe 23 is further end extended into the negative pressure chamber 21, and the diameter of the liquid pipe 23 is gradually reduced from a end close to the connecting pipe 6 to a end far from the connecting pipe 6.

When the aerator 2 is used specifically, oil in the oil tank 1 flows into the liquid through pipe 23 at high pressure and high speed under the action of the oil pump 7, and the diameter of the liquid through pipe 23 is gradually reduced from the end close to the connecting pipe 6 to the end far away from the connecting pipe 6, so that high-speed oil liquid is sprayed into the negative pressure cavity 21 from the end part of the liquid through pipe 23, and the high-speed oil liquid in the negative pressure cavity 21 can make the negative pressure cavity 21 generate negative pressure, so that air is introduced into the negative pressure cavity 21 through the air inlet pipe 25, and the liquid and the gas in the negative pressure cavity 21 are collided and mixed to form bubbles, so that the bubbles are discharged to the oil inlet pipe 8 through the diffusion pipe 24 and enter the oil inlet tank 4, and automatic aeration is realized.

As shown in FIG. 3, in order to achieve more efficient aeration, the invention further defines the structure of the liquid through pipe 23 in the step , the liquid through pipe 23 comprises a through pipe 231 and a liquid through pipe 232, two ends of the through pipe 231 are respectively connected with the liquid through pipe 232 and a connecting pipe 6, a threaded hole is arranged on the base 22, an external thread matched with the threaded hole is arranged on the through pipe 231, the through pipe 231 is in threaded connection with the base 22 through the threaded hole, more oil liquid can enter the through pipe 231, the end of the liquid through pipe 232 far away from the through pipe 231 extends into the negative pressure cavity 21, the diameter of the liquid through pipe 232 is gradually reduced from the end close to the through pipe 231 to the end far away from the through pipe 231, a round plate 233 with a closed pipe opening is arranged on the end of the liquid through pipe 232 far away from the through pipe 231, a through hole 234 with the diameter of 1.5mm is arranged on the round plate 233, the diameter of the.

In order to realize better generation of small bubbles and enable the streamline effect of demonstration to be better, steps are further limited in the technical scheme that mixed oil is stored in the oil tank 1 and is formed by mixing hydraulic oil and transformer oil in a weight ratio of 1: 2.

Example 2

As shown in FIG. 4, steps of embodiment 2 of the invention define that the device further comprises a rack 11 on the basis of embodiment 1, the rack 11 is used for supporting, the demonstration disc 3 is fixed on the rack 11, a black lining plate 12 fixed on the rack 11 is arranged at the bottom of the demonstration disc 3, the distance between the black lining plate 12 and the bottom of the demonstration disc 3 is 6-15cm, the arrangement of the black lining plate 12 can more clearly display the streamline formed by bubbles in the demonstration disc 3, the demonstration effect is better, tube lamps are arranged on two side walls of the demonstration disc 3, and the tube lamps arranged on the side walls are more convenient for observing the flow of fluid.

It should be emphasized that, in order to achieve better observation effect, through a large number of experiments, the distance between the black lining plate 12 and the bottom of the demonstration disc 3 is 10cm, so that the demonstration effect is clearer, and the observation effect is better.

Example 3

As shown in fig. 4, in embodiment 3 of the present invention, on the basis of embodiment 1, step defines the structure of the air fence 9, and it should be noted that, as shown in fig. 5, the air fence 9 of the present invention is formed by arranging a plurality of air deflectors 91 in parallel, a gap 92 is provided between two adjacent air deflectors, the cross section of the side of the air deflector 91 close to the oil inlet tank 4 is semicircular, the cross section of the side far from the oil inlet tank 4 is gradually reduced in size, and the end is shaped as a tip.

As shown in fig. 5 and 6, in addition, in order to enable the oil flow line to flow more stably, in the present technical solution, the display device further includes a flow stabilizer 14 disposed in the oil inlet tank 4, the flow stabilizer 14 includes a flow stabilizer 141 disposed at the bottom in the oil inlet tank 4 and a flow stabilizer 142 obliquely disposed on the demonstration tray 3 near the top of the oil inlet tank 4, preferably, an included angle between the flow stabilizer 142 and a vertical surface is 37 degrees, the flow stabilizer 141 is communicated with the oil inlet pipe 8, the bottom of the flow stabilizer 141 is provided with a plurality of oil outlets 143, the flow stabilizer 142 inclines from the top of the demonstration tray 3 into the oil inlet tank 4, a distance between the bottom end of the flow stabilizer 142 and the bottom of the demonstration tray 3 is 2cm, and a gap is formed between the flow stabilizer 142 and the inner side wall of the oil inlet tank 4.

The flow stabilizer 14 is provided to buffer the oil for better viewing of the oil flow conditions.

Example 4

As shown in fig. 4, in embodiment 4 of the present invention, based on embodiment 2, the fluid flow phenomenon is effectively observed by adjusting the flow rate in the demonstration plate 3, and the oil inlet pipe 8 is provided with a flow regulating valve 15. The flow velocity is increased, and the flowing phenomena of the streaming objects, such as the generation of vortex, boundary layer separation and the like, can be observed; the smaller the flow velocity, the better the observation of streamlines and traces.

As shown in fig. 7, , in order to realize the flow velocity of the fluid in the demonstration disc 3, the flow velocity is increased by changing the angle of the demonstration disc 3 in the technical scheme, specifically, a gradient adjusting bracket 16 is arranged at the bottom of the end of the demonstration disc 3 close to the oil inlet tank 4, the gradient adjusting bracket 16 comprises two support plates 161 and a lifting support connected between the two support plates 161, the lifting support comprises telescopic connecting rod assemblies 162 symmetrically arranged left and right, symmetrical free ends of the two telescopic connecting rod assemblies 162 are hinged through a cross rod 163, threaded holes are symmetrically formed in the two cross rods 163 positioned in the middle of the telescopic connecting rod assemblies 162, a lead screw 164 is connected in the threaded hole in a penetrating manner, and external threads in the opposite direction to the internal threads of the threaded hole;

two ends of cross bars 163 in two ends of the telescopic link assembly 162 are fixedly connected with two side edges of the support plate 161, two ends of cross bars 163 are connected with the sliding blocks 165, the edge of the support plate 161 is provided with strip-shaped sliding holes 166 along the length direction of the support plate 161, and the sliding blocks 165 are clamped in the strip-shaped sliding holes 166 and can slide along the strip-shaped sliding holes 166;

the telescopic link assembly 162 includes at least two cross members, with the ends of adjacent cross members being hinged, and the cross members being formed by two struts with the middle hinged.

Example 5

In example 5 of the present invention, based on example 1, at least model test pieces are provided on the oil flow line demonstration plate 3 in step , the cross sections of the model test pieces are types of square, circular, wing-shaped and pentagonal, the model test pieces can be fixed on the demonstration plate 3 by means of objects adsorbed by suction cups, colloids and the like, or can be clamped or plugged on the demonstration plate 3 by means of connecting posts, for example, as shown in fig. 9, which is a flow diagram of a model test piece with a cross section of a single wing-shaped model test piece at a zero angle (flat slope), as shown in fig. 11, which is a flow diagram of a model test piece with a square cross section at a flow diagram at a zero angle (flat slope), as shown in fig. 12, which is a flow diagram of a model test piece with a rhombic cross section at a zero angle (flat slope), as shown in fig. 13, which is a flow diagram of a model test piece with a cross section of a pointed square tail end at a zero angle (flat slope), as shown in fig. 14, which is a flow diagram of a model test piece with a zero angle (flat slope), as shown in fig. 13, which is a cross section of a straight tail end model test piece at a straight end, as a straight.

The model test piece can also be a model frame which is provided with an inlet and an outlet, such as a sudden shrinkage and a sudden expansion in the figure 10, and the change of the fluid around the wall surface of different model test pieces can be observed through the arrangement of different model test pieces.

Example 6

As shown in fig. 8, the present invention further provides an automatic aeration method of kinds of automatic aeration oil flow line display devices, which comprises the following steps:

s1, first, the oil pump 7 pumps out the mixed oil in the oil tank 1, and the mixed oil enters the through pipe 231 at high pressure;

s2, then, the mixed oil enters the liquid spraying pipe 232 from the through pipe 231 at a high speed and is sprayed into the negative pressure cavity 21 from the port of the liquid spraying pipe 232;

and S3, finally, generating negative pressure in the negative pressure cavity 21 by the high-speed power mixed oil, sucking air in the negative pressure cavity 21 through the air inlet pipe 25, violently mixing the air and the mixed oil to form oil bubbles, and discharging the oil bubbles to the oil inlet pipe 8 through the diffusion pipe 24.

By the method, more stable and uniform bubbles can be provided for the oil flow line display device, the oil flow state can be clearly displayed, and the demonstration effect is improved.

The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.

Claims

automatic gas-mixing oil streamline display devices, which is characterized in that the device comprises an oil tank (1), an aeration device (2) and a transparent demonstration disc (3), wherein oil inlet grooves (4) and oil return grooves (5) are respectively arranged at two ends of the demonstration disc (3), an outlet of the oil tank (1) is connected with the aeration device (2) through a connecting pipe (6), an oil pump (7) is arranged on the connecting pipe (6), the aeration device (2) is connected with the oil inlet grooves (4) through an oil inlet pipe (8), a flow guide grid (9) is arranged on a side, close to the demonstration disc (3), of the oil inlet grooves (4), the oil return grooves (5) are connected with an inlet of the oil tank (1) through oil return pipes (10),

wherein, aerify device (2) including inside be equipped with base (22) of negative pressure chamber (21) and with base (22) side spiral shell connect lead to liquid pipe (23), keep away from on base (22) the end that leads to liquid pipe (23) be equipped with diffuser pipe (24) of negative pressure chamber (21) intercommunication, diffuser pipe (24) are end connection in addition advance oil pipe (8), still be connected with on base (22) with intake pipe (25) of negative pressure chamber (21) intercommunication, lead to liquid pipe (23) end with connecting pipe (6) are connected, lead to liquid pipe (23) and stretch into in end in addition in negative pressure chamber (21), the diameter of leading to liquid pipe (23) is held to keeping away from by being close to of connecting pipe (6) the end of connecting pipe (6) reduces gradually.
2. The automatic aerated oil streamline display device as claimed in claim 1, wherein the liquid conduit (23) comprises a conduit (231) and a liquid spray tube (232), two ends of the conduit (231) are respectively connected with the liquid spray tube (232) and the connecting tube (6), the base (22) is provided with a threaded hole, the conduit (231) is provided with an external thread adapted to the threaded hole, the conduit (231) is in threaded connection with the base (22) through the threaded hole, the liquid spray tube (232) extends into the negative pressure cavity (21) from an end far away from the conduit (231), the diameter of the liquid spray tube (232) is gradually reduced from a end close to the conduit (231) to a end far away from the conduit (231), a disc (233) for closing the orifice is arranged on an end far away from the conduit (231) on the liquid spray tube (232), and a through hole (234) with a diameter of 1.5mm is arranged on the disc (233).
3. The automatic blending gas oil flow line display device of claim 2, wherein the oil tank (1) stores mixed oil, and the mixed oil is formed by mixing hydraulic oil and transformer oil in a weight ratio of 1: 2.
4. The automatic gas-mixing oil flow line display device as claimed in claim 1, further comprising a rack (11), wherein the demonstration disc (3) is fixed on the rack (11), a black lining plate (12) fixed on the rack (11) is arranged at the bottom of the demonstration disc (3), and the distance between the black lining plate (12) and the bottom of the demonstration disc (3) is 6-15 cm; both sides walls of the demonstration disc (3) are provided with lamp tubes (13).
5. The automatic blending gas oil flow line display device of claim 4, wherein the distance between the black lining plate (12) and the bottom of the demonstration disc (3) is 10 cm.
6. The automatic blending gas oil flow line display device of claim 4, wherein the oil inlet pipe (8) is provided with a flow regulating valve (15).
7. The automatic gas-blending oil flow line display device as claimed in claim 4, wherein a gradient adjusting support (16) is arranged at the end at the bottom of the rack (11), the gradient adjusting support (16) comprises two support plates (161) and a lifting support connected between the two support plates (161), the lifting support comprises telescopic connecting rod assemblies (162) symmetrically arranged from left to right, symmetrical free ends of the two telescopic connecting rod assemblies (162) are hinged through cross rods (163), threaded holes are symmetrically formed in the two cross rods (163) in the middle of the telescopic connecting rod assemblies (162), lead screws (164) are connected in the threaded holes in a penetrating manner, and external threads in opposite directions to those of the internal threads of the threaded holes are arranged at two ends of the lead screws (164);

two cross rods (163) positioned at two ends of the telescopic connecting rod assembly (162), wherein two ends of cross rods (163) are fixedly connected with two side edges of the supporting plate (161), two ends of cross rods (163) are connected with sliding blocks (165), the edge of the supporting plate (161) is provided with a strip-shaped sliding hole (166) along the length direction of the supporting plate (161), and the sliding blocks (165) are clamped in the strip-shaped sliding hole (166) and can slide along the strip-shaped sliding hole (166);

the telescopic connecting rod assembly (162) comprises at least two crossed parts, the end parts of the adjacent crossed parts are hinged, and the crossed parts are formed by hinging the middle parts of two supporting rods.
8. The automatic blending oil streamline display device according to claim 1, wherein the demonstration disc (3) is provided with at least model test pieces, and the cross section of the model test pieces is of square, round, wing-shaped and pentagon.
The automatic aeration method of the automatic aeration oil streamline display device according to claim 3, , wherein the method comprises the following steps:

s1, firstly, the oil pump (7) pumps out the mixed oil in the oil tank (1) and enters the through pipe (231) at high pressure;

s2, then, the mixed oil enters the liquid spraying pipe (232) from the through pipe (231) at a high speed, and is sprayed into the negative pressure cavity (21) from the port of the liquid spraying pipe (232);

s3, finally, the mixed oil with high-speed power generates negative pressure in the negative pressure cavity (21), so that air is sucked in the negative pressure cavity (21) through the air inlet pipe (25), the air and the mixed oil are mixed violently to form oil bubbles, and the oil bubbles are discharged to the oil inlet pipe (8) through the diffusion pipe (24).