An oil and gas viscosity testing system based on air track

Abstract

The application discloses a kind of oil and gas viscosity test systems based on air cushion guide rail, including providing oil and gas medium oil and gas modulation system;Regulate the temperature of oil and gas medium oil and gas temperature regulating system;Test oil and gas viscosity air cushion guide rail platform;Adsorb and discharge oil and gas oil and gas discharge system;Collect and display test data parameter acquisition system;Air cushion guide rail platform includes platform shell, air cushion guide rail, slider, first photoelectric switch, second photoelectric switch and speed exciter, air cushion guide rail is located in platform shell, slider is placed on air cushion guide rail, air cushion guide rail inside is oil and gas cavity, its surface with slider contact is provided with gas hole for oil and gas medium to emit, speed exciter is located in the end of air cushion guide rail, provides initial speed for slider, first photoelectric switch and second photoelectric switch are respectively located in air cushion guide rail side edge, for measuring the speed and time interval of slider sequentially through two photoelectric switches.The present application realizes the accurate test of oil and gas medium viscosity under different oil and gas ratio and temperature.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas viscosity testing technology, specifically relating to an oil and gas viscosity testing system based on an air cushion guide rail. Background Technology

[0002] In high-speed rotating machinery such as high-speed electric motors, turbochargers, and aero engines, their supporting bearings often employ thin oil lubrication or oil-air / oil-mist lubrication. Oil-air or oil-mist lubrication, as the lubricating medium, is formed by uniformly mixing a certain proportion of small oil droplets in the air. The viscosity of the oil-air medium has a significant impact on the operating performance of the bearings and seals within it, including film formation characteristics and temperature rise characteristics. Obtaining accurate oil-air medium viscosity is crucial for calculating the performance of oil-air lubricated bearings and seals.

[0003] The viscosity of the lubricating oil is 10~100 mPa·s. -1 Furthermore, its viscosity is highly sensitive to temperature changes, while the viscosity of air is only 10~20 μPa·s. -1 The viscosity values ​​of air and oil droplets differ by 3 to 4 orders of magnitude, so changes in temperature and the oil-to-air ratio can cause significant changes in the viscosity of the oil-gas medium. Since air is a continuous phase medium and oil droplets are a discrete phase medium in oil-gas media, the viscosity of the mixed-phase medium cannot be obtained by simply weighting the viscosity of the two and the oil-to-air ratio. Currently, the viscosity testing technology for lubricating oil and lubricating oil containing air bubbles is relatively mature: the lubricating oil to be tested is placed in a container with a stirrer, and the viscosity can be indirectly measured by testing the frictional torque of the stirrer during stirring. However, when this method is used for viscosity testing of gas or oil-gas media with low oil-to-air ratios, the stirring torque generated by the medium is very small due to the low viscosity of the medium, and the additional torque of the stirrer support bearing and the container seal is much greater than the stirring torque. Therefore, it is necessary to propose a fluid viscosity testing system suitable for low-viscosity oil-gas mixed-phase media with controllable oil-to-air ratio and temperature. Summary of the Invention

[0004] To address the problem that existing fluid viscosity testing systems cannot perform viscosity testing on low-viscosity oil-gas mixed media, the present invention aims to provide an oil-gas viscosity testing system based on an air cushion guide rail.

[0005] To achieve the above objectives, the following technical solution is proposed:

[0006] An oil-gas viscosity testing system based on an air cushion guide rail includes...

[0007] An oil-gas modulation system is used to provide an oil-gas medium with adjustable oil-gas ratio and pressure;

[0008] Oil and gas temperature control system is used to regulate the temperature of oil and gas media;

[0009] Air cushion guide rail platform, used for testing oil and gas viscosity;

[0010] Oil and gas exhaust system for adsorbing and discharging oil and gas;

[0011] Parameter acquisition system for collecting and displaying test data;

[0012] The oil and gas conditioning system is sequentially connected with the oil and gas temperature adjusting system and the air cushion rail platform, and the air cushion rail platform is connected with the oil and gas exhaust system and the parameter acquisition system.

[0013] The air cushion rail platform comprises a platform shell, an air cushion rail, a sliding block, a first photoelectric switch, a second photoelectric switch and a speed exciter. The air cushion rail is arranged in the platform shell to prevent the oil and gas medium from escaping into the environment. The sliding block is arranged on the air cushion rail. The air cushion rail has an oil and gas cavity inside. The air cushion rail has a gas outlet hole for the oil and gas medium to be sprayed on the surface in contact with the sliding block. An oil and gas film is formed between the air cushion rail and the sliding block. The speed exciter is arranged at the end of the air cushion rail to provide an initial speed for the sliding block. Under the condition of a given initial speed, the sliding block can move in a uniform deceleration straight line motion above the oil and gas film, and the acceleration is directly related to the viscosity of the oil and gas. The first photoelectric switch and the second photoelectric switch are arranged on the side edges of the air cushion rail respectively to measure the speed and time interval of the sliding block passing through the first photoelectric switch and the second photoelectric switch in sequence.

[0014] Further, the upper end of the sliding block is provided with a displacement sensor and a light barrier. The displacement sensor is used to measure the thickness of the oil and gas film between the air cushion rail and the sliding block, which can be measured when the sliding block is in a stationary state.

[0015] Further, the oil and gas conditioning system comprises a lubricating oil source, an air compressor, an oil and gas mixer and a pressure stabilizing tank. An oil valve is arranged on the pipeline connecting the lubricating oil source and the oil and gas mixer. A pressure valve is arranged on the pipeline connecting the air compressor and the oil and gas mixer. The oil and gas mixer is connected with the pressure stabilizing tank. The pressure stabilizing tank is connected with the air cushion rail platform through an oil and gas pipeline. An oil and gas regulating valve and an oil and gas temperature adjusting system are arranged on the oil and gas pipeline. A first pressure gauge is arranged on the pressure stabilizing tank. The oil valve adjusts the amount of lubricating oil added. The pressure valve adjusts the amount of air added. The lubricating oil and the air are fully mixed in the oil and gas mixer to form an oil and gas medium. The oil and gas medium enters the pressure stabilizing tank and is output after being adjusted by the oil and gas regulating valve.

[0016] Further, the oil and gas temperature adjusting system comprises a hot water source, a cold water source, a mixing regulating valve and a heat exchanger. The hot water source and the cold water source are respectively connected with the mixing regulating valve. The mixing regulating valve is connected with the heat exchanger. The heat exchanger adjusts the temperature of the oil and gas medium passing therethrough. A thermometer is arranged on the pipeline connecting the heat exchanger and the mixing regulating valve. The hot water in the hot water source and the cold water in the cold water source are mixed by the mixing regulating valve to form a fluid with a certain temperature and flow rate and enter the heat exchanger.

[0017] Further, the oil and gas pipeline is communicated with the oil and gas cavity of the air cushion guide rail through the platform shell, and the oil and gas is added into the oil and gas cavity of the air cushion guide rail.

[0018] Further, the air cushion guide rail is provided with limiters at two ends.

[0019] Further, the end of the platform shell is provided with a lead-out hole, the lead-out hole is used for connecting an oil and gas discharge system, the oil and gas discharge system comprises a lubricating oil adsorption device and a residual lubricating oil detector, the lead-out hole is connected with the lubricating oil adsorption device through a pipeline, and the residual lubricating oil detector is used for detecting whether the residual lubricating oil content after adsorption reaches a discharge standard.

[0020] Further, the air cushion guide rail is provided with an oil and gas ratio detector and a temperature sensor, which are used for detecting the oil and gas ratio and the temperature after the oil and gas medium is sprayed out, the first photoelectric switch and the second photoelectric switch are connected with a speed signal collector, and the parameter acquisition system comprises a data transmission line, a data acquisition card and a computer, the oil and gas ratio detector, the temperature sensor and the speed signal collector are connected with the data acquisition card through the data transmission line respectively, the data acquisition card is connected with the computer, and the data acquisition is displayed and saved in the computer.

[0021] The theoretical basis for testing the viscosity of the oil and gas medium is the Newton internal friction law and the Newton second law of Newton fluid:

[0022]

[0023] In the formula, F is the resistance received by the sliding block during movement, m is the mass of the sliding block, a is the acceleration of the sliding block movement, h is the thickness of the oil and gas film between the sliding block and the air cushion guide rail, v is the average speed of the sliding block, A is the contact area of the sliding block and the oil and gas medium.

[0024] When the oil and gas is sprayed out through the air outlet hole on the air cushion guide rail, an extremely thin oil and gas film is formed between the air cushion guide rail plane and the sliding block plane to realize the non-contact operation of the two. When the sliding block is given an initial speed, the sliding block can move at an extremely low resistance on the oil and gas film, and at this time, the sliding block movement resistance mainly comes from the viscous friction of the air film. It is assumed that the fluid movement speed in the extremely small thickness of the oil and gas film is linearly changed along the film thickness, wherein the fluid speed on the static guide rail contact surface is 0, and the fluid speed on the sliding block contact surface is equal to the sliding block speed. Based on the above principle, the kinematic viscosity can be represented as:

[0025]

[0026] When the present application is used for oil and gas viscosity test, firstly, the displacement of the slider in the vertical direction is measured by the displacement sensor above the slider when the slider speed is zero, and the oil and gas film thickness can be indirectly calculated according to the relationship between the vertical displacement of the slider and the oil and gas film thickness; the oil and gas film thickness can be adjusted by changing the oil and gas pressure, and the higher the oil and gas pressure, the greater the oil and gas film thickness. The slider obtains an initial speed under the action of the slider speed exciter, and makes a reciprocating linear motion above the oil and gas film layer, and the initial speed of the slider can be adjusted by adjusting the hitting force of the slider speed exciter. Because the slider will be blocked by the oil and gas film on the lower surface of the slider during the movement, the movement is uniform deceleration. A light barrier is installed on the slider, and two photoelectric switches are installed on the air cushion guide rail. When the slider passes through the photoelectric switch, the light barrier blocks the light of the photoelectric switch, thereby driving the photoelectric switch to start timing and measuring the speed value. Specifically, when the slider passes through the first photoelectric switch, the time t 1 and the speed v 1 are obtained; when the slider passes through the second photoelectric switch, the time t 2 and the speed v 2 are obtained, the average speed v can be obtained according to the speed v 1 and v 2, and the acceleration a can be obtained according to the speed difference and the time difference. On the basis of the given mass of the slider m and the contact area of the slider A , the oil and gas medium viscosity μ can be obtained according to the above measured oil and gas film thickness h , the slider speed v and the slider acceleration a .

[0027] In view of the high sensitivity of the oil and gas medium viscosity to the oil and gas temperature and the oil and gas ratio, the present application can realize accurate regulation and test of the oil and gas film layer temperature and the oil and gas ratio. The regulation of the oil and gas ratio is realized by the oil and gas regulating system, and the volume ratio of the two can be realized by changing the flow of the lubricating oil before mixing and the air pressure; the regulation of the oil and gas temperature is realized by the oil and gas temperature regulating system, and can be regulated by changing the water temperature and flow in the heat exchanger. The temperature sensor and the oil and gas ratio detector are fixed on the platform shell, and the probes of the two sensors are aligned with the oil and gas ejection hole of the air cushion guide rail to directly monitor the temperature and the oil and gas ratio of the oil and gas film. By changing the oil and gas ratio and the oil and gas temperature, and measuring the oil and gas medium viscosity, the correlation model of the oil and gas viscosity value with respect to the two parameters of the oil and gas ratio and the oil and gas temperature can be further fitted.

[0028] If the oil gas medium sprayed from the air cushion guide rail is directly discharged into the environment, the environment will be polluted, and the physical and mental health of the operator will be affected. A closed platform shell is arranged above the air cushion guide rail, so as to seal the oil gas medium in the platform shell; an outlet hole is arranged above the platform shell, an oil gas discharge pipeline is connected with the outlet hole, and a lubricating oil adsorption device for adsorbing lubricating oil and a residual lubricating oil detector for detecting the content of residual lubricating oil are arranged in the oil gas discharge pipeline, so as to ensure that the medium discharged into the environment meets the discharge standard.

[0029] The beneficial effects of the present application are:

[0030] (1) By using the air cushion guide rail, the sliding block and the photoelectric switch in cooperation, the precise test of the viscosity value of low-viscosity air or oil gas medium can be conveniently realized;

[0031] (2) By using the oil gas conditioning system, the oil gas temperature conditioning system, and the temperature sensor and the oil gas ratio detector installed on the air cushion guide rail, the test of the oil gas viscosity under different pressure, temperature and oil gas ratio conditions can be realized, and the correlation model of the oil gas viscosity and the oil gas temperature and the oil gas ratio is established, and the model has a wide application range;

[0032] (3) The closed platform shell and the oil gas discharge system are arranged above the air cushion guide rail, so as to ensure that the cleanliness of the gas discharged into the environment meets the discharge requirement, and to avoid the pollution of the atmospheric environment and the harm to the physical and mental health of the operator. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a schematic view of the present application;

[0034] Figure 2 is a sectional view of the air cushion guide rail and the sliding block along the vertical direction of movement of the present application;

[0035] Figure 3 is a three-dimensional schematic view of the air cushion guide rail platform of the present application.

[0036] Figure: 1, oil and gas conditioning system; 11, lubricating oil source; 12, oil valve; 13, air compressor; 14, pressure valve; 15, oil and gas mixer; 16, first pressure gauge; 17, pressure stabilizing tank; 18, oil and gas regulating valve; 19, oil and gas pipeline; 2, oil and gas temperature conditioning system; 21, hot water source; 22, cold water source; 23, mixed regulating valve; 24, thermometer; 25, heat exchanger; 3, air cushion guide rail platform; 31, platform shell; 311, lead hole; 32, air cushion guide rail; 321, oil and gas cavity; 322, air outlet hole; 323, position limiter; 33, sliding block; 331, displacement sensor; 332, light shield; 34, first photoelectric switch; 35, second photoelectric switch; 36, speed exciter; 37, oil and gas ratio detector; 38, temperature sensor; 39, speed signal collector; 4, oil and gas discharge system; 41, lubricating oil adsorption device; 42, residual lubricating oil detector; 5, parameter acquisition system; 51, data transmission line; 52, data acquisition card; 53, computer. DETAILED DESCRIPTION

[0037] The embodiment of the application is further described in combination with the drawings of the specification.

[0038] REFERENCE Figures 1-3 An oil and gas viscosity test system based on air cushion guide rail, comprising an oil and gas conditioning system 1, an oil and gas temperature conditioning system 2, an air cushion guide rail platform 3, an oil and gas discharge system 4, and a parameter acquisition system 5.

[0039] The oil and gas conditioning system 1 comprises a lubricating oil source 11, an air compressor 13, an oil and gas mixer 15, and a pressure stabilizing tank 17. An oil valve 12 is arranged on the pipeline connecting the lubricating oil source 11 and the oil and gas mixer 15. A pressure valve 14 is arranged on the pipeline connecting the air compressor 13 and the oil and gas mixer 15. The oil and gas mixer 15 is connected to the pressure stabilizing tank 17. The pressure stabilizing tank 17 is connected to the air cushion guide rail platform 3 through an oil and gas pipeline 19. The oil and gas pipeline 19 is provided with an oil and gas regulating valve 18 and an oil and gas temperature conditioning system 2. The pressure stabilizing tank 17 is provided with a first pressure gauge 16. The lubricating oil provided by the lubricating oil source 11 is controlled by the oil valve 12 to control the flow rate of the lubricating oil. The dry air provided by the air compressor 13 is adjusted by the pressure valve 14 to adjust the gas pressure. The dry gas and the lubricating oil pass through the oil and gas mixer 15 to form a mixed oil and gas medium with a certain oil and gas ratio. The prepared oil and gas medium is introduced into the pressure stabilizing tank 17 for pressure stabilization and uniform mixing. The oil and gas medium pressure is read by the first pressure gauge 16 and kept constant. The oil and gas regulating valve 18 arranged at the outlet is used to control the oil and gas medium pressure flowing into the air cushion guide rail platform 3.

[0040] The oil-gas temperature regulating system 2 comprises a hot water source 21, a cold water source 22, a mixing regulating valve 23 and a heat exchanger 25, the hot water source 21 and the cold water source 22 are connected to the mixing regulating valve 23 respectively, the mixing regulating valve 23 is connected to the heat exchanger 25, the heat exchanger 25 regulates the temperature of the oil-gas medium in the oil-gas pipeline 19 passing through the heat exchanger 25, a thermometer 24 is arranged on the pipeline connecting the heat exchanger 25 and the mixing regulating valve 23, the flow of the low-temperature water and the high-temperature water is changed through the mixing regulating valve 23, so as to regulate the temperature and flow of the mixed water, the mixed water flows out of the mixing regulating valve 23 and enters the heat exchanger 25, exchanges heat with the oil-gas medium to change the temperature of the oil-gas medium, and the temperature of the mixed water can be read from the thermometer 24.

[0041] The air cushion guide rail platform 3 comprises a platform shell 31, an air cushion guide rail 32, a sliding block 33, a first photoelectric switch 34, a second photoelectric switch 35 and a speed exciter 36, the air cushion guide rail 32 is arranged in the platform shell 31, the platform shell 31 is airtight and transparent to prevent the oil-gas medium from escaping, the sliding block 33 is arranged on the air cushion guide rail 32, the air cushion guide rail 32 has an oil-gas cavity 321 inside, the air cushion guide rail 32 is provided with air outlet holes 322 on the surface in contact with the sliding block 33 for the oil-gas medium to be uniformly sprayed out, the oil-gas pipeline 19 passes through the platform shell 31 and communicates with the oil-gas cavity 321 of the air cushion guide rail 32, the oil-gas medium enters the oil-gas cavity 321 and is sprayed out from the air outlet holes 322 to form an oil-gas film between the air cushion guide rail 32 and the sliding block 33, the thickness of the oil-gas film can be measured by a displacement sensor 331 arranged above the sliding block 33 when the sliding block 33 is static, the temperature and the oil-gas ratio of the oil-gas medium after being sprayed out can be measured by an oil-gas ratio detector 37 and a temperature sensor 38 arranged on the air cushion guide rail 32 respectively, the air cushion guide rail 32 is provided with limiters 323 at two ends, the sliding block 33 makes a deceleration reciprocating motion between the two limiters 323, the speed exciter 36 is arranged at the end of the air cushion guide rail 32 to change the initial speed of the sliding block 33, the first photoelectric switch 34 and the second photoelectric switch 35 are arranged on the side edges of the air cushion guide rail 32 respectively, the first photoelectric switch 34 and the second photoelectric switch 35 are connected to a speed signal collector 39, the sliding block 33 is provided with a light barrier 332, the light barrier 332 blocks the first photoelectric switch 34 and the second photoelectric switch 35 in turn during the movement of the sliding block 33, the speed signal collector 39 displays the movement speed and acceleration of the sliding block 33, and then the viscosity of the oil-gas medium is obtained, the platform shell 31 is provided with a lead-out hole 311. When the sliding block 33 is static, the displacement sensor 331 arranged above the sliding block 33 measures the floating height of the sliding block 33.

[0042] The oil and gas discharging system 4 comprises a lubricating oil adsorption device 41 and a residual lubricating oil detector 42. The lead hole 311 is connected with the lubricating oil adsorption device 41 through a pipeline. The excess oil and gas is filtered through the lubricating oil adsorption device 41 and detected in the residual lubricating oil detector 42 until the content of oil in the oil and gas medium is reduced to the discharging standard and discharged to the atmosphere.

[0043] The parameter acquisition system 5 comprises a data transmission line 51, a data acquisition card 52 and a computer 53. The oil and gas ratio detector 37, the temperature sensor 38 and the speed signal collector 39 are connected with the data acquisition card 52 through the data transmission line 51 respectively. The data acquisition card 52 is connected with the computer 53. The collected data is displayed and saved.

Claims

1. An air track based oil and gas viscosity testing system, characterized by, The utility model relates to a kind of oil-gas testing device, comprising Oil-gas modulation system (1) for providing oil-gas ratio and pressure-adjustable oil-gas medium; Oil-gas temperature control system (2) for regulating the temperature of oil-gas medium; Air cushion guide rail platform (3) for testing oil-gas viscosity; Oil-gas exhaust system (4) for adsorbing and discharging oil-gas; Parameter acquisition system (5) for collecting and displaying test data; The oil-gas modulation system (1) is sequentially connected with the oil-gas temperature control system (2) and the air cushion guide rail platform (3), and the air cushion guide rail platform (3) is connected with the oil-gas exhaust system (4) and the parameter acquisition system (5). The air cushion guide rail platform (3) comprises a platform shell (31), an air cushion guide rail (32), a sliding block (33), a first photoelectric switch (34), a second photoelectric switch (35) and a speed exciter (36). The air cushion guide rail (32) is arranged in the platform shell (31), and the sliding block (33) is arranged on the air cushion guide rail (32). The inside of the air cushion guide rail (32) is an oil-gas cavity (321). The surface of the air cushion guide rail (32) in contact with the sliding block (33) is provided with an air outlet hole (322) for the oil-gas medium to be sprayed out. The speed exciter (36) is arranged at the end of the air cushion guide rail (32) to provide an initial speed for the sliding block (33). The first photoelectric switch (34) and the second photoelectric switch (35) are arranged at the sides of the air cushion guide rail (32) respectively to measure the speed and time interval of the sliding block (33) passing through the first photoelectric switch (34) and the second photoelectric switch (35) in sequence. The end of the platform shell (31) is provided with a lead-out hole (311) for connecting the oil-gas exhaust system (4). The oil-gas exhaust system (4) comprises a lubricating oil adsorption device (41) and a residual lubricating oil detector (42). The lead-out hole (311) is connected with the lubricating oil adsorption device (41) through a pipeline. The residual lubricating oil detector (42) is used to detect whether the content of residual lubricating oil after adsorption meets the emission standard.

2. The air track based oil and gas viscosity testing system of claim 1, wherein The upper end of the sliding block (33) is provided with a displacement sensor (331) and a light shield (332). The displacement sensor (331) is used to measure the thickness of the oil-gas film between the air cushion guide rail (32) and the sliding block (33).

3. The air track based oil and gas viscosity testing system of claim 1, wherein The oil-gas modulation system (1) comprises a lubricating oil source (11), an air compressor (13), an oil-gas mixer (15) and a pressure stabilizing tank (17). An oil valve (12) is arranged on the pipeline connecting the lubricating oil source (11) and the oil-gas mixer (15). A pressure valve (14) is arranged on the pipeline connecting the air compressor (13) and the oil-gas mixer (15). The oil-gas mixer (15) is connected with the pressure stabilizing tank (17). The pressure stabilizing tank (17) is connected with the air cushion guide rail platform (3) through an oil-gas pipeline (19). The oil-gas pipeline (19) is provided with an oil-gas regulating valve (18) and an oil-gas temperature control system (2). The pressure stabilizing tank (17) is provided with a first pressure gauge (16).

4. The air track based oil and gas viscosity testing system of claim 3, wherein The oil-gas temperature regulating system (2) comprises a hot water source (21), a cold water source (22), a mixing regulating valve (23) and a heat exchanger (25), the hot water source (21) and the cold water source (22) are connected with the mixing regulating valve (23) respectively, the mixing regulating valve (23) is connected with the heat exchanger (25), the heat exchanger (25) regulates the temperature of the oil-gas medium in the oil-gas pipeline (19) passing through the heat exchanger (25), and a thermometer (24) is arranged on the pipeline connected with the mixing regulating valve (23).

5. An air track based oil and gas viscosity testing system as claimed in claim 4, wherein The oil-gas pipeline (19) communicates with the oil-gas cavity (321) of the air cushion guide rail (32) through the platform shell (31).

6. The air track based oil and gas viscosity testing system of claim 2, wherein Limiters (323) are arranged at two ends of the air cushion guide rail (32).

7. The air track based oil and gas viscosity testing system of claim 1, wherein The air cushion guide rail (32) is provided with an oil-gas ratio detector (37) and a temperature sensor (38), the first photoelectric switch (34) and the second photoelectric switch (35) are connected with a speed signal collector (39), and a parameter acquisition system (5) comprises a data transmission line (51), a data acquisition card (52) and a computer (53), the oil-gas ratio detector (37), the temperature sensor (38) and the speed signal collector (39) are connected with the data acquisition card (52) through the data transmission line (51) respectively, and the data acquisition card (52) is connected with the computer (53).

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