CN110081955B - Method for detecting variable viscosity lubricating oil micro-flowmeter - Google Patents
Method for detecting variable viscosity lubricating oil micro-flowmeter Download PDFInfo
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- CN110081955B CN110081955B CN201910353695.4A CN201910353695A CN110081955B CN 110081955 B CN110081955 B CN 110081955B CN 201910353695 A CN201910353695 A CN 201910353695A CN 110081955 B CN110081955 B CN 110081955B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/14—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters using a weighing apparatus
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Abstract
The invention relates to a variable viscosity lubricating oil micro-flowmeter calibrating method, which adopts a device comprising a variable temperature oil tank, a power system, a pressure stabilizing system, a flow regulating system, a detection system and a reversing weighing system, wherein the temperature of oil contained in the variable temperature oil tank is regulated through the variable temperature oil tank so as to realize the regulation of the viscosity of the oil, the detected flowmeter and a standard flowmeter used as a reference are connected in series in the whole device, the oil in the variable temperature oil tank is pumped into each system of each device through the power system, the oil passes through the detected flowmeter and the standard flowmeter after being subjected to pressure stabilizing filtration and flow regulation, is weighed through the weighing box, and finally returns into the variable temperature oil tank, and the detection and characteristic research on different flowmeters are realized by changing the viscosity and the flow of the oil.
Description
Technical Field
The invention relates to the technical field of flowmeter detection equipment, in particular to a method for detecting a variable-viscosity lubricating oil micro flowmeter.
Background
The flowmeter is a common meter in the mechanical field, the common flowmeters comprise a turbine flowmeter and a gear flowmeter, the flowmeter is applied more in a state of national defense systems, particularly in a state of small flow of high-viscosity media, and the characteristics of the flowmeter in liquid media with different viscosities, including meter linearity, repeatability and the like, regular detection and calibration are required for the flowmeter in use to ensure the accuracy and safety of the flowmeter, particularly in the field of aviation, so that a standard verification method is urgently needed to detect the use characteristics of the flowmeter in media with different viscosities and different flow rates, the problem that the meter needs to be noticed in use is summarized, and a correct measurement and use method is provided for the measurement of the medium with different viscosities and the small flow of the national defense systems.
Disclosure of Invention
In order to solve the problems, the invention provides a variable viscosity lubricating oil micro-flow meter verification method.
The specific contents are as follows: the variable viscosity lubricating oil micro flow meter calibration method adopts a variable viscosity lubricating oil micro flow standard device, and the device comprises a variable temperature oil tank, a power system, a pressure stabilizing system, a flow regulating system, a detection system and a reversing weighing system, and is characterized in that:
the variable-temperature oil tank is an oil storage tank capable of adjusting temperature, the power system comprises two oil pumps which are arranged in parallel, the oil inlet end of each oil pump is communicated with the variable-temperature oil tank through a pipeline, and the oil outlet end of each oil pump is connected with a one-way valve in series through a pipeline;
a voltage stabilizing system is arranged on the base plate,
the pressure stabilizing system comprises a multifunctional integrated tank and a pressure stabilizing tank group, the multifunctional integrated tank comprises a tank body, an upper end cover matched with the tank body, and a filter screen and an air baffle which are arranged in the tank body,
the tank body is a cylindrical barrel with an opening at the upper end and a hemispherical bottom, an oil inlet communicated with the interior of the tank body is arranged on the side wall of the upper end of the tank body, the one-way valves are communicated with the oil inlet through pipelines, an oil outlet communicated with the interior of the tank body is arranged on the side wall of the lower end of the tank body, the oil inlet and the oil outlet are respectively positioned at two sides of the tank body, a drain outlet communicated with the interior of the tank body is arranged at the bottom of the tank body, a drain valve is communicated with the drain outlet, an annular lug protruding inwards along the radial direction is arranged on the inner wall of the tank body, and the annular lug is;
the filter screen is in a cylindrical shape with an opening at the upper end, filter holes are arranged on the side wall and the bottom of the filter screen according to a certain density, the outer diameter of the filter screen is equal to the inner diameter of the annular hanging lug, an annular convex edge which protrudes outwards along the radial direction is arranged on the edge of the upper end port of the filter screen, the opening of the filter screen penetrates the annular hanging lug upwards and downwards and is fixed with the annular hanging lug through the convex edge, the filter screen is fixed with the annular hanging lug through a fastening bolt, the fastening bolt vertically penetrates the convex edge of the filter screen and is matched and screwed with a threaded hole on the annular hanging lug, and a handle B is further fixed on the fastening bolt;
the gas baffle is over against the oil inlet and is fixed on the inner wall of the tank body in an inclined manner, the gas baffle is positioned right above the filter screen, and is inclined downwards towards one side of the oil inlet and completely covers the cross section of the oil inlet, and the area of the axial projection of the gas baffle on the tank body is smaller than the area of the cross section inside the tank body;
the upper end cover is hemispherical and matched with the upper port of the tank body, the top of the upper end cover is provided with an overflow port communicated with the interior of the tank body, the overflow port is communicated with a three-way pipe joint, the other two joints on the three-way pipe joint are respectively communicated with an overflow valve and a pressure stabilizing pipe, the other end of the pressure stabilizing pipe is communicated with a pressure stabilizing tank group, the overflow valve is connected back into the temperature-changing oil tank through a pipeline, and the upper end cover is correspondingly buckled on the upper port of the tank body and is sealed and fixed through at least four loose joint bolts uniformly distributed along the circumference;
a flow rate regulating system is arranged on the base,
the flow regulating system comprises two accurate flow regulating valves which are arranged in parallel, each accurate flow regulating valve comprises a valve body and three valve cores with different specifications which are arranged in the valve body,
an inlet flow passage communicated with the outside, an outlet flow passage communicated with the outside and a valve cavity communicated with the inlet flow passage and the outlet flow passage in the valve body are arranged in the valve body; the inlet flow channel of each accurate flow regulating valve is communicated with the oil outlet of the tank body through a pipeline, the valve cavity comprises a valve cavity A, a valve cavity B and a valve cavity C which are independently arranged, the valve cavity A is communicated with the inlet flow channel through a sub-flow channel A, the valve cavity B is communicated with the inlet flow channel through a sub-flow channel B, the valve cavity C is communicated with the inlet flow channel through a sub-flow channel C, and the valve cavity A, the valve cavity B and the valve cavity C are communicated with the outlet flow channel;
the valve core comprises a valve core A, a valve core B and a valve core C, the valve core A is a cylinder matched with the inner diameter of the sub-flow passage A, the valve core A is coaxially inserted in the sub-runner A, one end of the valve core A is positioned in the valve cavity A, the axial length of the valve core A is matched with the transverse length of the valve cavity A, a disc-shaped sealing end plate A which has the diameter larger than that of the valve core A and is matched with the valve cavity A is coaxially fixed on the end surface of one end of the valve core A in the valve cavity A, a valve rod A which extends outwards and passes through the valve body is coaxially fixed on the outer end surface of the sealing end plate A, the valve rod A is connected with the valve body through screw threads, the valve core A is provided with a shunt way A which is uniformly distributed along the outer circumferential surface and is cut inwards, the sub-runner A is formed by scanning and cutting off a fan-shaped outline along an arc-shaped path A, the arc-shaped path A is coplanar with the axis of the valve core A and extends from the center of the end face circle of one end of the valve core A in the sub-runner A to the outer circumferential surface of the valve core A;
the valve core B is a cylinder with the inner diameter matched with the inner diameter of the sub-flow passage B, the valve core B is coaxially inserted in the sub-flow passage B, one end of the valve core B is positioned in the valve cavity B, the axial length of the valve core B is matched with the transverse length of the valve cavity B, a disc-shaped sealing end plate B which has the diameter larger than that of the valve core B and is matched with the valve cavity B is coaxially fixed on the end surface of one end of the valve core B in the valve cavity B, a valve rod B which extends outwards and penetrates through the valve body is coaxially fixed on the outer end surface of the sealing end plate B, the valve rod B is connected with the valve body through screw threads, the valve core B is provided with sub-runners B which are uniformly distributed along the outer circumferential surface and cut inwards, the sub-flow channel B is formed by scanning and cutting off a fan-shaped outline along an arc-shaped path B, the arc-shaped path B is coplanar with the axis of the valve core B and extends from the center of the end face circle of one end of the valve core B in the sub-flow channel B to the outer circumferential surface of the valve core B;
the valve core C is a cylinder matched with the inner diameter of the sub-flow passage C, the valve core C is coaxially inserted in the sub-flow passage C, one end of the valve core C is positioned in the valve cavity C, the axial length of the valve core C is matched with the transverse length of the valve cavity C, a disc-shaped sealing end plate C which is larger than the diameter of the valve core C and matched with the valve cavity C is coaxially fixed on the end surface of one end of the valve core C positioned in the valve cavity C, a valve rod C which extends outwards and penetrates through the valve body is coaxially fixed on the outer end surface of the sealing end plate C, and the valve rod C is connected with the valve body through threads; the valve core C is provided with a sub-channel C which is uniformly distributed along the outer circumferential surface and is cut inwards, the sub-channel C is formed by scanning and cutting a fan-shaped profile along an arc-shaped path C, the arc-shaped path C is coplanar with the axis of the valve core C and extends from the center of the end surface of one end of the valve core C in the sub-channel C to the outer circumferential surface of the valve core C;
the detection system is used for detecting the position of the object,
the detection system comprises a detection branch A and a detection branch B which are arranged in parallel, wherein the detection branch A comprises a detected flowmeter A and a standard flowmeter A which are connected in series through a pipeline, the detection branch B comprises a detected flowmeter B and a standard flowmeter B which are connected in series through a pipeline, and the detection branch A and the detection branch B are both communicated with outlet flow channels of two accurate flow regulating valves through pipelines respectively;
the reversing weighing system is used for reversing the weighing system,
the reversing weighing system comprises an air blowing reversing oil inlet device and a weighing box with an oil separator;
the air-blowing reversing oil inlet device comprises a fixed plate, a reversing cylinder, an oil inlet pipe, a Y-shaped reversing head and an air-blowing mechanism, wherein the oil inlet pipe comprises a horizontal section and a vertical section, the free end of the horizontal section of the oil inlet pipe is horizontally fixed on the fixed plate through a revolute pair, the detection branch A and the detection branch B are both communicated with the free end of the horizontal section of the oil inlet pipe through pipelines, a connecting plate which is parallel to the vertical section is fixed on the horizontal section of the oil inlet pipe, the reversing cylinder is horizontally fixed on the side surface of the fixed plate through a small cantilever, the reversing cylinder and the oil inlet pipe are fixed on the same side surface of the fixed plate, one end of the reversing cylinder is hinged on the connecting plate, the reversing head is a Y-shaped cavity body and comprises a main flow passage and two symmetrical branch flow passages, the cavity of the main flow passage is divided into two parts which respectively correspond to the cavities of the branch flow passages through, the main flow passage of the reversing head is vertically fixed on the side surface of the fixed plate through a large cantilever, the free end of the vertical section of the oil inlet pipe extends into the reversing head from the upper port of the main flow passage of the reversing head, and the port of the free end of the vertical section of the oil inlet pipe is positioned right above the vertical partition plate;
the air blowing mechanism comprises an air inlet pipe and an air blowing hoop provided with an air blowing opening and a communicating cavity, the air blowing hoop is horizontally fixed on the outer side wall of the reversing head along the joint of a main runner and a sub-runner of the reversing head, the communicating cavity communicated end to end along the circumference of the air blowing hoop is arranged in the air blowing hoop, a plurality of air blowing openings which are obliquely and downwards communicated with the cavity of the sub-runner of the reversing head and the communicating cavity of the air blowing hoop are uniformly arranged in the air blowing hoop, and the air inlet pipe communicated with the communicating cavity is respectively fixed on the two symmetrical side surfaces of the air blowing hoop;
the weighing box with the oil separator comprises an electronic balance, a weighing box fixed on the upper part of the electronic balance and the oil separator fixed in the weighing box, the weighing box is cylindrical, the upper end of the weighing box is opened, the bottom of the weighing box is fixed on a bearing surface of the electronic balance through a support, the bottom of the interior of the weighing box is in an inverted cone shape, an oil discharge pipe which is communicated with the interior of the weighing box and extends outwards is arranged at the conical tip of the inverted cone at the bottom, the oil discharge pipe is communicated into an oil tank through a pipeline, and an electromagnetic valve is arranged on the pipeline of the temperature change pipe in series; the oil separator comprises an umbrella-shaped oil separating cap and supporting legs, the bottom of the oil separating cap is vertically fixed on an inverted conical surface at the bottom of the weighing box through at least three supporting legs, the axis of the oil separating cap is collinear with the axis of the weighing box, a bus of the oil separating cap is in a concave arc shape, a lower port of a branch runner of the reversing head extends into the weighing box and is positioned right above the oil separating cap, a lower port of the other branch runner of the reversing head is positioned outside the weighing box, the lower port of the branch runner is communicated into the variable-temperature oil tank through a pipeline, and an included angle alpha of the inner surface of the bottom of the weighing box passing through a contour line of the section of a central line is 90 degrees;
the method for calibrating the variable viscosity lubricating oil micro flow meter by adopting the variable viscosity lubricating oil micro flow standard device comprises the following steps:
firstly, connecting a detected flowmeter and a standard flowmeter with the same model in series on a detection branch A and a detection branch B;
adjusting the temperature of the variable temperature oil tank to a corresponding temperature according to the relation between the viscosity and the temperature of the oil, wherein the viscosity of the oil at the temperature is the viscosity of the oil required by the test, opening each control valve, starting an oil pump to pump the oil in the variable temperature oil tank into each system, then directly returning the oil to the variable temperature oil tank through a shunt outside a reversing head, and circulating the oil in each system to accelerate the temperature change of the oil;
thirdly, when the temperature of the oil in the variable-temperature oil tank reaches a specified temperature, the oil is pumped into the tank body from an oil inlet of the tank body through an oil pump and directly impacts on the air baffle plate, the oil is dispersed so as to be convenient for discharging air in the oil, an overflow port is arranged on the upper end cover, a pressure stabilizing tank set is communicated through the overflow port and used for stabilizing the oil pressure of the tank body and an oil way, and the oil enters a filter screen for filtration and impurity removal;
discharging the oil through an oil outlet of the tank body, then entering a precise flow regulating valve, regulating the flow of a detection branch according to a standard flowmeter, performing combined regulation on the flow of a medium through three valve cores with different specifications, realizing precise regulation on the flow of the medium so as to meet the requirements of the test flow of the detected flowmeter and the standard flowmeter, and collecting related flow data when the oil with the flow meeting the experimental requirements sequentially passes through the detected flowmeter and the standard flowmeter;
fifthly, the oil enters a reversing weighing system to weigh the oil, an oil inlet pipe is pushed to a corresponding diversion channel of a reversing head above a weighing box through a reversing cylinder, the oil enters the reversing head through the oil inlet pipe and enters the weighing box from the diversion channel above the weighing box, and the oil flows out of the diversion channel of the reversing head, disperses on the upper surface of an oil distributing cap and slides along the inner side surface of the weighing box to the weighing box;
when the oil flow is measured, the air inlet pipe of the air blowing mechanism is communicated with an air source, air is blown into a sub-channel of the reversing head through each air blowing port of the air blowing mechanism, and the oil adhered to the inner wall of the reversing head is blown out of the reversing head and enters the weighing box;
and seventhly, weighing the oil in the weighing box by using an electronic balance, discharging the oil into a temperature-changing oil tank through an oil discharge pipe after weighing is finished, and finally, comprehensively calculating to realize detection and calibration of the detected flow according to the data detected by the detected flowmeter and the standard flowmeter, the weight of the oil in the weighing box and the time of the oil passing through the detected flowmeter.
Preferably, the loose joint bolt comprises a screw rod hinged on the outer side wall of the tank body, a fixing lug horizontally fixed on the outer wall of the upper end cover and a nut matched with the screw rod, an installation bayonet matched with the screw rod is arranged at the free end of the fixing lug, the screw rod corresponds to the fixing lug in position and rotates to enable the screw rod to penetrate through the installation bayonet on the fixing lug, the upper end cover and the tank body are fixed in a sealing mode through screwing the nut, and a handle nail is fixed on the nut.
Preferably, the arc-shaped path A, the arc-shaped path B and the arc-shaped path C are sections of parabolas or sections of ellipses.
Preferably, the arc-shaped path A, the arc-shaped path B and the arc-shaped path C are sections of parabolas, the vertex of each parabola is respectively located at the starting point of the arc-shaped path A, the starting point of the arc-shaped path B and the starting point of the arc-shaped path C, and the focus of each parabola is respectively located on the axis of the valve core A, the axis of the valve core B and the axis of the valve core C.
Preferably, the arc-shaped path A, the arc-shaped path B and the arc-shaped path C are sections of an ellipse, one vertex of the long axis of the ellipse is the starting point of the arc-shaped path A, the starting point of the arc-shaped path B and the starting point of the arc-shaped path C respectively, and the focus of the ellipse is on the axis of the valve core A, the axis of the valve core B and the axis of the valve core C respectively.
Preferably, a handle A is fixed on the free end of the valve rod A, a handle B is fixed on the free end of the valve rod B, and a handle C is fixed on the free end of the valve rod C.
Preferably, the reversing cylinder comprises a cylinder body and a piston rod, the cylinder body is horizontally fixed on the side surface of the fixing plate through a small cantilever, and the free end of the piston rod is hinged on the connecting plate.
Preferably, the detection branch circuit A and the detection branch circuit B are both connected in series with a thermometer and a pressure gauge.
Preferably, the pipelines connected between the systems are all connected with control valves in series.
The invention has the beneficial technical effects that:
the invention relates to a variable viscosity lubricating oil micro-flowmeter calibrating method, in a pressure stabilizing system of a device adopted by the method, oil enters a tank body through an oil inlet and directly impacts on a gas baffle plate, the oil is dispersed to facilitate the discharge of air in the oil, so as to avoid influencing a detection experiment, an overflow port is arranged on an upper end cover, a pressure stabilizing tank group is communicated through the overflow port and is used for stabilizing the oil pressure of the tank body and an oil way, the oil enters a filter screen for filtration and impurity removal, finally enters a precise flow regulating valve through an oil outlet of the tank body for flow regulation, the flow of a medium is combined and regulated through three valve cores with different specifications, the precise regulation of the medium flow is realized, and thus the requirement of the flow size of a detected flowmeter is met,
in the reversing weighing system, oil in the oil inlet pipe enters the reversing head, the swinging angle of the oil inlet pipe is controlled by the reversing cylinder, thereby corresponding to different sub-runners of the reversing head, realizing the change of the oil flow path and direction, namely, the oil enters the weighing box or flows back to the temperature-changing oil tank in diameter, the oil flows out from the subchannel of the reversing head, is dispersed along the upper surface of the oil separating cap and slides into the weighing box along the inner side surface of the weighing box, the oil is prevented from directly impacting the bottom of the box body, the system stability is increased, the oil is prevented from splashing, the weighing is more accurate, and the electronic balance is protected, after oil liquid is finished, the air source is communicated with the air inlet pipe of the air blowing mechanism, air is blown into the sub-channel of the reversing head through each air blowing port of the air blowing mechanism, the oil liquid adhered to the inner wall of the reversing head is blown out of the reversing head, unnecessary errors of experimental data are reduced, and accordingly more accurate experimental results are obtained.
Drawings
FIG. 1 is a schematic view of the overall structure of a variable viscosity oil micro-flow standard device;
FIG. 2 is a schematic diagram of the overall structure of the voltage stabilizing system;
FIG. 3 is a schematic view of the main structure of the multifunctional integral tank;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is an enlarged view of A in FIG. 4;
FIG. 6 is a front view of a precision flow control valve;
FIG. 7 is a schematic cross-sectional view taken along the line B-B in FIG. 6;
FIG. 8 is a schematic cross-sectional view taken along the line C-C in FIG. 7;
FIG. 9 is a schematic view of the subjective structure of the valve core A;
FIG. 10 is a schematic cross-sectional view taken along line D-D of FIG. 9;
FIG. 11 is a schematic view of the subjective structure of the valve core B;
FIG. 12 is a schematic cross-sectional view taken along line E-E of FIG. 11;
FIG. 13 is a schematic view of the subjective structure of the valve core C;
FIG. 14 is a schematic cross-sectional view taken along the direction F-F in FIG. 13;
FIG. 15 is a cross-sectional view of the reversing weighing system;
FIG. 16 is a cross-sectional view of a gas-blowing reversing oil feed;
FIG. 17 is a right side view of FIG. 16;
FIG. 18 is a sectional view taken in the direction G-G of FIG. 16;
FIG. 19 is a cross-sectional view of the weigh tank with oil separator;
FIG. 20 is a front view of the oil separator;
FIG. 21 is a top view of FIG. 20;
in the figure:
1. the automatic oil supply device comprises a valve body, a valve core A, a valve core B, a valve core C, a multifunctional integrated tank 5, a blowing reversing oil inlet device 61, a weighing box with an oil separator 62, a check valve 7, an oil pump 71, accurate flow regulating valves 8 and 81, a detection branch A and a detection branch 92, detection branches B and 911 and 921 are thermometers, 913 and 923 are pressure gauges 912, detected flow meters A and 922, detected flow meters B and 914, standard flow meters A and 924, a standard flow meter B, a temperature-changing oil tank 10 and a control valve 101;
11. the valve cavity A, 12, the valve cavity B, 13, the valve cavity C, 14, the sub-flow passage A, 15, the sub-flow passage B, 16, the sub-flow passage C, 17, the inlet flow passage, 19, the outlet flow passage, 21, the valve rod A, 22, the handle A, 23, the sealing end plate A, 24, the sub-flow passage A, 25, the arc path A, 31, the valve rod B, 32, the handle B, 33, the sealing end plate B, 34, the sub-flow passage B, 35, the arc path B, 41, the valve rod C, 42, the handle C, 43, the sealing end plate C, 44, the sub-flow passage C, 45 and the arc path C;
51. the device comprises a tank body, a filter screen 52, an air baffle 53, an upper end cover 54, a pressure stabilizing tube 55, a pressure stabilizing tank 56;
511. the sewage treatment device comprises an oil inlet, a 512 oil outlet, 513 a sewage discharge port, 514 an annular lug, 516 a three-way pipe joint, 517 a sewage discharge valve, 519 an overflow valve, 521 a filter hole, 522 a convex edge, 523 a fastening bolt, 524 a handle B, 541 an overflow port, 542 a fixing lug, 543 a screw rod, 544 a nut, 545 a handle A and 546 an installation bayonet;
611. the cylinder comprises a piston rod of a reversing cylinder, 612, a cylinder body of the reversing cylinder, 613, a vertical section of an oil inlet pipe, 614, a fixing plate, 615, a main flow passage of a reversing head, 616, an air inlet pipe, 617, a communication chamber, 618, an air blowing port, 619, a branch flow passage of the reversing head, 620, a vertical partition plate, 6111, a connecting plate, 6121, a small cantilever, 6141, a large cantilever, 6161, an air blowing hoop, 6131, a horizontal section of the oil inlet pipe, 621, an oil separating cap, 622, supporting legs, 623, a weighing box, 624, an inverted conical bottom of the weighing box, 625, a support, 626, an oil discharge pipe, 627, an electronic balance, 628, an electromagnetic valve and 6211, and a recessed contour line of the oil separating cap.
Detailed Description
In the first embodiment, referring to fig. 1 to 21, a variable viscosity lubricating oil micro flow meter calibration method adopts a variable viscosity lubricating oil micro flow standard device, which comprises a variable temperature oil tank, a power system, a pressure stabilizing system, a flow regulating system, a detection system and a reversing weighing system;
the variable temperature oil tank is an oil storage tank capable of adjusting temperature, the detection of the flow meter is related to the viscosity of oil, and the viscosity of the oil is related to the temperature of the oil, so that the viscosity of the oil is adjusted through adjusting the temperature in the variable temperature oil tank to meet the detection requirement of the flow meter;
a voltage stabilizing system is arranged on the base plate,
the pressure stabilizing system comprises a multifunctional integrated tank and a pressure stabilizing tank group, the multifunctional integrated tank comprises a tank body, an upper end cover matched with the tank body, and a filter screen and an air baffle which are arranged in the tank body,
the tank body is a cylindrical barrel with an opening at the upper end and a hemispherical bottom, an oil inlet communicated with the interior of the tank body is arranged on the side wall of the upper end of the tank body, the one-way valves are communicated with the oil inlet through pipelines, an oil outlet communicated with the interior of the tank body is arranged on the side wall of the lower end of the tank body, the oil inlet and the oil outlet are respectively positioned at two sides of the tank body, a drain outlet communicated with the interior of the tank body is arranged at the bottom of the tank body, a drain valve is communicated with the drain outlet, an annular lug protruding inwards along the radial direction is arranged on the inner wall of the tank body, and the annular lug is;
the filter screen is in a cylindrical shape with an opening at the upper end, filter holes are arranged on the side wall and the bottom of the filter screen according to a certain density, the outer diameter of the filter screen is equal to the inner diameter of the annular hanging lug, an annular convex edge which protrudes outwards along the radial direction is arranged on the edge of the upper end port of the filter screen, the opening of the filter screen penetrates the annular hanging lug upwards and downwards and is fixed with the annular hanging lug through the convex edge, the filter screen is fixed with the annular hanging lug through a fastening bolt, the fastening bolt vertically penetrates the convex edge of the filter screen and is matched and screwed with a threaded hole on the annular hanging lug, and a handle B is further fixed on the fastening bolt;
the gas baffle is over against the oil inlet and is fixed on the inner wall of the tank body in an inclined manner, the gas baffle is positioned right above the filter screen, and is inclined downwards towards one side of the oil inlet and completely covers the cross section of the oil inlet, and the area of the axial projection of the gas baffle on the tank body is smaller than the area of the cross section inside the tank body;
the upper end cover is hemispherical and matched with the upper port of the tank body, the top of the upper end cover is provided with an overflow port communicated with the interior of the tank body, the overflow port is communicated with a three-way pipe joint, the other two joints on the three-way pipe joint are respectively communicated with an overflow valve and a pressure stabilizing pipe, the other end of the pressure stabilizing pipe is communicated with a pressure stabilizing tank group, the overflow valve is connected back into the temperature-changing oil tank through a pipeline, and the upper end cover is correspondingly buckled on the upper port of the tank body and is sealed and fixed through at least four loose joint bolts uniformly distributed along the circumference;
a flow rate regulating system is arranged on the base,
the flow regulating system comprises two accurate flow regulating valves which are arranged in parallel, each accurate flow regulating valve comprises a valve body and three valve cores with different specifications which are arranged in the valve body,
an inlet flow passage communicated with the outside, an outlet flow passage communicated with the outside and a valve cavity communicated with the inlet flow passage and the outlet flow passage in the valve body are arranged in the valve body; the inlet flow channel of each accurate flow regulating valve is communicated with the oil outlet of the tank body through a pipeline, the valve cavity comprises a valve cavity A, a valve cavity B and a valve cavity C which are independently arranged, the valve cavity A is communicated with the inlet flow channel through a sub-flow channel A, the valve cavity B is communicated with the inlet flow channel through a sub-flow channel B, the valve cavity C is communicated with the inlet flow channel through a sub-flow channel C, and the valve cavity A, the valve cavity B and the valve cavity C are communicated with the outlet flow channel;
the valve core comprises a valve core A, a valve core B and a valve core C, the valve core A is a cylinder matched with the inner diameter of the sub-flow passage A, the valve core A is coaxially inserted in the sub-runner A, one end of the valve core A is positioned in the valve cavity A, the axial length of the valve core A is matched with the transverse length of the valve cavity A, a disc-shaped sealing end plate A which has the diameter larger than that of the valve core A and is matched with the valve cavity A is coaxially fixed on the end surface of one end of the valve core A in the valve cavity A, a valve rod A which extends outwards and passes through the valve body is coaxially fixed on the outer end surface of the sealing end plate A, the valve rod A is connected with the valve body through screw threads, the valve core A is provided with a shunt way A which is uniformly distributed along the outer circumferential surface and is cut inwards, the sub-runner A is formed by scanning and cutting off a fan-shaped outline along an arc-shaped path A, the arc-shaped path A is coplanar with the axis of the valve core A and extends from the center of the end face circle of one end of the valve core A in the sub-runner A to the outer circumferential surface of the valve core A;
the valve core B is a cylinder with the inner diameter matched with the inner diameter of the sub-flow passage B, the valve core B is coaxially inserted in the sub-flow passage B, one end of the valve core B is positioned in the valve cavity B, the axial length of the valve core B is matched with the transverse length of the valve cavity B, a disc-shaped sealing end plate B which has the diameter larger than that of the valve core B and is matched with the valve cavity B is coaxially fixed on the end surface of one end of the valve core B in the valve cavity B, a valve rod B which extends outwards and penetrates through the valve body is coaxially fixed on the outer end surface of the sealing end plate B, the valve rod B is connected with the valve body through screw threads, the valve core B is provided with sub-runners B which are uniformly distributed along the outer circumferential surface and cut inwards, the sub-flow channel B is formed by scanning and cutting off a fan-shaped outline along an arc-shaped path B, the arc-shaped path B is coplanar with the axis of the valve core B and extends from the center of the end face circle of one end of the valve core B in the sub-flow channel B to the outer circumferential surface of the valve core B;
the valve core C is a cylinder matched with the inner diameter of the sub-flow passage C, the valve core C is coaxially inserted in the sub-flow passage C, one end of the valve core C is positioned in the valve cavity C, the axial length of the valve core C is matched with the transverse length of the valve cavity C, a disc-shaped sealing end plate C which is larger than the diameter of the valve core C and matched with the valve cavity C is coaxially fixed on the end surface of one end of the valve core C positioned in the valve cavity C, a valve rod C which extends outwards and penetrates through the valve body is coaxially fixed on the outer end surface of the sealing end plate C, and the valve rod C is connected with the valve body through threads; the valve core C is provided with a sub-channel C which is uniformly distributed along the outer circumferential surface and is cut inwards, the sub-channel C is formed by scanning and cutting a fan-shaped profile along an arc-shaped path C, the arc-shaped path C is coplanar with the axis of the valve core C and extends from the center of the end surface of one end of the valve core C in the sub-channel C to the outer circumferential surface of the valve core C;
the detection system is used for detecting the position of the object,
the detection system comprises a detection branch circuit A and a detection branch circuit B which are arranged in parallel, wherein the detection branch circuit A comprises a detected flowmeter A and a standard flowmeter A which are connected in series through a pipeline, the detection branch circuit B comprises a detected flowmeter B and a standard flowmeter B which are connected in series through a pipeline, the detection branch circuit A and the detection branch circuit B are both communicated with outlet flow passages of two accurate flow regulating valves through pipelines, and the standard flowmeter is used for flow indication and secondary standard;
the reversing weighing system is used for reversing the weighing system,
the reversing weighing system comprises an air blowing reversing oil inlet device and a weighing box with an oil separator;
the air-blowing reversing oil inlet device comprises a fixed plate, a reversing cylinder, an oil inlet pipe, a Y-shaped reversing head and an air-blowing mechanism, wherein the oil inlet pipe comprises a horizontal section and a vertical section, the free end of the horizontal section of the oil inlet pipe is horizontally fixed on the fixed plate through a revolute pair, the detection branch A and the detection branch B are both communicated with the free end of the horizontal section of the oil inlet pipe through pipelines, a connecting plate which is parallel to the vertical section is fixed on the horizontal section of the oil inlet pipe, the reversing cylinder is horizontally fixed on the side surface of the fixed plate through a small cantilever, the reversing cylinder and the oil inlet pipe are fixed on the same side surface of the fixed plate, one end of the reversing cylinder is hinged on the connecting plate, the reversing head is a Y-shaped cavity body and comprises a main flow passage and two symmetrical branch flow passages, the cavity of the main flow passage is divided into two parts which respectively correspond to the cavities of the branch flow passages through, the main flow passage of the reversing head is vertically fixed on the side surface of the fixed plate through a large cantilever, the free end of the vertical section of the oil inlet pipe extends into the reversing head from the upper port of the main flow passage of the reversing head, and the port of the free end of the vertical section of the oil inlet pipe is positioned right above the vertical partition plate;
the air blowing mechanism comprises an air inlet pipe and an air blowing hoop provided with an air blowing opening and a communicating cavity, the air blowing hoop is horizontally fixed on the outer side wall of the reversing head along the joint of a main runner and a sub-runner of the reversing head, the communicating cavity which is communicated end to end along the circumference of the air blowing hoop is arranged in the air blowing hoop, a plurality of air blowing openings which are obliquely and downwards communicated with a cavity of the sub-runner of the reversing head and the communicating cavity of the air blowing hoop are uniformly arranged in the air blowing hoop, the air inlet pipe communicated with the communicating cavity is respectively fixed on two symmetrical side surfaces of the air blowing hoop, air is blown into the sub-runner of the reversing head through each air blowing opening of the air blowing mechanism, the oil adhered on the inner wall of the reversing head is blown out of the reversing head and enters the weighing box, unnecessary errors of experimental data are reduced, and more accurate experimental results are;
the weighing box with the oil separator comprises an electronic balance, a weighing box fixed on the upper part of the electronic balance and the oil separator fixed in the weighing box, the weighing box is cylindrical, the upper end of the weighing box is opened, the bottom of the weighing box is fixed on a bearing surface of the electronic balance through a support, the bottom of the interior of the weighing box is in an inverted cone shape, an oil discharge pipe which is communicated with the interior of the weighing box and extends outwards is arranged at the conical tip of the inverted cone at the bottom, the oil discharge pipe is communicated into an oil tank through a pipeline, and an electromagnetic valve is arranged on the pipeline of the temperature change pipe in series; the oil separator comprises an umbrella-shaped oil separating cap and supporting legs, the bottom of the oil separating cap is vertically fixed on an inverted conical surface at the bottom of the weighing box through at least three supporting legs, the axis of the oil separating cap is collinear with the axis of the weighing box, a bus of the oil separating cap is in a concave arc shape, oil flowing into the oil separating cap from an oil inlet pipe is guaranteed to slide along the upper surface of the oil separating cap, the oil is prevented from being raised and splashing, a lower port of a branch runner of the reversing head extends into the weighing box and is positioned right above the oil separating cap, a lower port of another branch runner of the reversing head is positioned outside the weighing box, the lower port of the branch runner is communicated into the variable-temperature oil tank through a pipeline, the oil flows out of the branch runner of the reversing head and disperses along the upper surface of the oil separating cap and slides into the weighing box along the inner side surface of the weighing box, and the oil is prevented from directly impacting the bottom of the box body, the stability of the system is improved, oil is prevented from splashing, the weighing is more accurate, and the electronic balance is protected;
the method for calibrating the variable viscosity lubricating oil micro flow meter by adopting the variable viscosity lubricating oil micro flow standard device comprises the following steps:
firstly, connecting a detected flowmeter and a standard flowmeter with the same model in series on a detection branch A and a detection branch B;
adjusting the temperature of the variable temperature oil tank to a corresponding temperature according to the relation between the viscosity and the temperature of the oil, wherein the viscosity of the oil at the temperature is the viscosity of the oil required by the test, opening each control valve, starting an oil pump to pump the oil in the variable temperature oil tank into each system, then directly returning the oil to the variable temperature oil tank through a shunt outside a reversing head, and circulating the oil in each system to accelerate the temperature change of the oil;
thirdly, when the temperature of the oil in the variable-temperature oil tank reaches a specified temperature, the oil is pumped into the tank body from an oil inlet of the tank body through an oil pump and directly impacts on the air baffle plate, the oil is dispersed so as to be convenient for discharging air in the oil, an overflow port is arranged on the upper end cover, a pressure stabilizing tank set is communicated through the overflow port and used for stabilizing the oil pressure of the tank body and an oil way, and the oil enters a filter screen for filtration and impurity removal;
discharging the oil through an oil outlet of the tank body, then entering a precise flow regulating valve, regulating the flow of a detection branch according to a standard flowmeter, performing combined regulation on the flow of a medium through three valve cores with different specifications, realizing precise regulation on the flow of the medium so as to meet the requirements of the test flow of the detected flowmeter and the standard flowmeter, and collecting related flow data when the oil with the flow meeting the experimental requirements sequentially passes through the detected flowmeter and the standard flowmeter;
fifthly, the oil enters a reversing weighing system to weigh the oil, an oil inlet pipe is pushed to a corresponding diversion channel of a reversing head above a weighing box through a reversing cylinder, the oil enters the reversing head through the oil inlet pipe and enters the weighing box from the diversion channel above the weighing box, and the oil flows out of the diversion channel of the reversing head, disperses on the upper surface of an oil distributing cap and slides along the inner side surface of the weighing box to the weighing box;
when the oil flow is measured, the air inlet pipe of the air blowing mechanism is communicated with an air source, air is blown into a sub-channel of the reversing head through each air blowing port of the air blowing mechanism, and the oil adhered to the inner wall of the reversing head is blown out of the reversing head and enters the weighing box;
and seventhly, weighing the oil in the weighing box by using an electronic balance, discharging the oil into a temperature-changing oil tank through an oil discharge pipe after weighing is finished, and finally, comprehensively calculating to realize detection and calibration of the detected flow according to the data detected by the detected flowmeter and the standard flowmeter, the weight of the oil in the weighing box and the time of the oil passing through the detected flowmeter.
The loose joint bolt comprises a screw rod hinged to the outer side wall of the tank body, a fixing lug horizontally fixed on the outer wall of the upper end cover and a nut matched with the screw rod, an installation bayonet matched with the screw rod is arranged at the free end of the fixing lug, the screw rod corresponds to the fixing lug in position and rotates to enable the screw rod to penetrate through the installation bayonet on the fixing lug, the upper end cover and the tank body are fixed in a sealing mode through screwing the nut, and a handle A is fixed on the nut.
The arc-shaped path A, the arc-shaped path B and the arc-shaped path C are sections of parabolas or sections of ellipses.
The arc-shaped path A, the arc-shaped path B and the arc-shaped path C are sections of parabolas, the top points of the parabolas are respectively positioned at the starting points of the arc-shaped path A, the arc-shaped path B and the arc-shaped path C, and the focuses of the parabolas are respectively positioned on the axes of the valve core A, the valve core B and the valve core C.
The arc-shaped path A, the arc-shaped path B and the arc-shaped path C are sections of an ellipse, one vertex of the long axis of the ellipse is the starting point of the arc-shaped path A, the starting point of the arc-shaped path B and the starting point of the arc-shaped path C respectively, and the focus of the ellipse is on the axis of the valve core A, the axis of the valve core B and the axis of the valve core C respectively.
A handle A is fixed on the free end of the valve rod A, a handle B is fixed on the free end of the valve rod B, and a handle C is fixed on the free end of the valve rod C.
The reversing cylinder comprises a cylinder body and a piston rod, the cylinder body is horizontally fixed on the side face of the fixed plate through a small cantilever, and the free end of the piston rod is hinged to the connecting plate.
The included angle alpha of the contour line of the cross section of the inner surface of the bottom of the weighing box passing through the center line is 90 degrees.
The first detection branch and the second detection branch are connected in series with a thermometer and a pressure gauge and used for collecting temperature and pressure data in the pipeline.
The pipeline connected between each system is connected with a control valve in series, so that the flow between each system can be controlled conveniently, and the instrument can be replaced conveniently.
Claims (9)
1. The variable viscosity lubricating oil micro flow meter calibration method adopts a variable viscosity lubricating oil micro flow standard device, and the device comprises a variable temperature oil tank, a power system, a pressure stabilizing system, a flow regulating system, a detection system and a reversing weighing system, and is characterized in that:
the variable-temperature oil tank is an oil storage tank capable of adjusting temperature, the power system comprises two oil pumps which are arranged in parallel, the oil inlet end of each oil pump is communicated with the variable-temperature oil tank through a pipeline, and the oil outlet end of each oil pump is connected with a one-way valve in series through a pipeline;
a voltage stabilizing system is arranged on the base plate,
the pressure stabilizing system comprises a multifunctional integrated tank and a pressure stabilizing tank group, the multifunctional integrated tank comprises a tank body, an upper end cover matched with the tank body, and a filter screen and an air baffle which are arranged in the tank body,
the tank body is a cylindrical barrel with an opening at the upper end and a hemispherical bottom, an oil inlet communicated with the interior of the tank body is arranged on the side wall of the upper end of the tank body, the one-way valves are communicated with the oil inlet through pipelines, an oil outlet communicated with the interior of the tank body is arranged on the side wall of the lower end of the tank body, the oil inlet and the oil outlet are respectively positioned at two sides of the tank body, a drain outlet communicated with the interior of the tank body is arranged at the bottom of the tank body, a drain valve is communicated with the drain outlet, an annular lug protruding inwards along the radial direction is arranged on the inner wall of the tank body, and the annular lug is;
the filter screen is in a cylindrical shape with an opening at the upper end, filter holes are arranged on the side wall and the bottom of the filter screen according to a certain density, the outer diameter of the filter screen is equal to the inner diameter of the annular hanging lug, an annular convex edge which protrudes outwards along the radial direction is arranged on the edge of the upper end port of the filter screen, the opening of the filter screen penetrates the annular hanging lug upwards and downwards and is fixed with the annular hanging lug through the convex edge, the filter screen is fixed with the annular hanging lug through a fastening bolt, the fastening bolt vertically penetrates the convex edge of the filter screen and is matched and screwed with a threaded hole on the annular hanging lug, and a handle B is further fixed on the fastening bolt;
the gas baffle is over against the oil inlet and is fixed on the inner wall of the tank body in an inclined manner, the gas baffle is positioned right above the filter screen, and is inclined downwards towards one side of the oil inlet and completely covers the cross section of the oil inlet, and the area of the axial projection of the gas baffle on the tank body is smaller than the area of the cross section inside the tank body;
the upper end cover is hemispherical and matched with the upper port of the tank body, the top of the upper end cover is provided with an overflow port communicated with the interior of the tank body, the overflow port is communicated with a three-way pipe joint, the other two joints on the three-way pipe joint are respectively communicated with an overflow valve and a pressure stabilizing pipe, the other end of the pressure stabilizing pipe is communicated with a pressure stabilizing tank group, the overflow valve is connected back into the temperature-changing oil tank through a pipeline, and the upper end cover is correspondingly buckled on the upper port of the tank body and is sealed and fixed through at least four loose joint bolts uniformly distributed along the circumference;
a flow rate regulating system is arranged on the base,
the flow regulating system comprises two accurate flow regulating valves which are arranged in parallel, each accurate flow regulating valve comprises a valve body and three valve cores with different specifications which are arranged in the valve body,
an inlet flow passage communicated with the outside, an outlet flow passage communicated with the outside and a valve cavity communicated with the inlet flow passage and the outlet flow passage in the valve body are arranged in the valve body; the inlet flow channel of each accurate flow regulating valve is communicated with the oil outlet of the tank body through a pipeline, the valve cavity comprises a valve cavity A, a valve cavity B and a valve cavity C which are independently arranged, the valve cavity A is communicated with the inlet flow channel through a sub-flow channel A, the valve cavity B is communicated with the inlet flow channel through a sub-flow channel B, the valve cavity C is communicated with the inlet flow channel through a sub-flow channel C, and the valve cavity A, the valve cavity B and the valve cavity C are communicated with the outlet flow channel;
the valve core comprises a valve core A, a valve core B and a valve core C, the valve core A is a cylinder matched with the inner diameter of the sub-flow passage A, the valve core A is coaxially inserted in the sub-runner A, one end of the valve core A is positioned in the valve cavity A, the axial length of the valve core A is matched with the transverse length of the valve cavity A, a disc-shaped sealing end plate A which has the diameter larger than that of the valve core A and is matched with the valve cavity A is coaxially fixed on the end surface of one end of the valve core A in the valve cavity A, a valve rod A which extends outwards and passes through the valve body is coaxially fixed on the outer end surface of the sealing end plate A, the valve rod A is connected with the valve body through screw threads, the valve core A is provided with a shunt way A which is uniformly distributed along the outer circumferential surface and is cut inwards, the sub-runner A is formed by scanning and cutting off a fan-shaped outline along an arc-shaped path A, the arc-shaped path A is coplanar with the axis of the valve core A and extends from the center of the end face circle of one end of the valve core A in the sub-runner A to the outer circumferential surface of the valve core A;
the valve core B is a cylinder with the inner diameter matched with the inner diameter of the sub-flow passage B, the valve core B is coaxially inserted in the sub-flow passage B, one end of the valve core B is positioned in the valve cavity B, the axial length of the valve core B is matched with the transverse length of the valve cavity B, a disc-shaped sealing end plate B which has the diameter larger than that of the valve core B and is matched with the valve cavity B is coaxially fixed on the end surface of one end of the valve core B in the valve cavity B, a valve rod B which extends outwards and penetrates through the valve body is coaxially fixed on the outer end surface of the sealing end plate B, the valve rod B is connected with the valve body through screw threads, the valve core B is provided with sub-runners B which are uniformly distributed along the outer circumferential surface and cut inwards, the sub-flow channel B is formed by scanning and cutting off a fan-shaped outline along an arc-shaped path B, the arc-shaped path B is coplanar with the axis of the valve core B and extends from the center of the end face circle of one end of the valve core B in the sub-flow channel B to the outer circumferential surface of the valve core B;
the valve core C is a cylinder matched with the inner diameter of the sub-flow passage C, the valve core C is coaxially inserted in the sub-flow passage C, one end of the valve core C is positioned in the valve cavity C, the axial length of the valve core C is matched with the transverse length of the valve cavity C, a disc-shaped sealing end plate C which is larger than the diameter of the valve core C and matched with the valve cavity C is coaxially fixed on the end surface of one end of the valve core C positioned in the valve cavity C, a valve rod C which extends outwards and penetrates through the valve body is coaxially fixed on the outer end surface of the sealing end plate C, and the valve rod C is connected with the valve body through threads; the valve core C is provided with a sub-channel C which is uniformly distributed along the outer circumferential surface and is cut inwards, the sub-channel C is formed by scanning and cutting a fan-shaped profile along an arc-shaped path C, the arc-shaped path C is coplanar with the axis of the valve core C and extends from the center of the end surface of one end of the valve core C in the sub-channel C to the outer circumferential surface of the valve core C;
the detection system is used for detecting the position of the object,
the detection system comprises a detection branch A and a detection branch B which are arranged in parallel, wherein the detection branch A comprises a detected flowmeter A and a standard flowmeter A which are connected in series through a pipeline, the detection branch B comprises a detected flowmeter B and a standard flowmeter B which are connected in series through a pipeline, and the detection branch A and the detection branch B are both communicated with outlet flow channels of two accurate flow regulating valves through pipelines respectively;
the reversing weighing system is used for reversing the weighing system,
the reversing weighing system comprises an air blowing reversing oil inlet device and a weighing box with an oil separator;
the air-blowing reversing oil inlet device comprises a fixed plate, a reversing cylinder, an oil inlet pipe, a Y-shaped reversing head and an air-blowing mechanism, wherein the oil inlet pipe comprises a horizontal section and a vertical section, the free end of the horizontal section of the oil inlet pipe is horizontally fixed on the fixed plate through a revolute pair, the detection branch A and the detection branch B are both communicated with the free end of the horizontal section of the oil inlet pipe through pipelines, a connecting plate which is parallel to the vertical section is fixed on the horizontal section of the oil inlet pipe, the reversing cylinder is horizontally fixed on the side surface of the fixed plate through a small cantilever, the reversing cylinder and the oil inlet pipe are fixed on the same side surface of the fixed plate, one end of the reversing cylinder is hinged on the connecting plate, the reversing head is a Y-shaped cavity body and comprises a main flow passage and two symmetrical branch flow passages, the cavity of the main flow passage is divided into two parts which respectively correspond to the cavities of the branch flow passages through, the main flow passage of the reversing head is vertically fixed on the side surface of the fixed plate through a large cantilever, the free end of the vertical section of the oil inlet pipe extends into the reversing head from the upper port of the main flow passage of the reversing head, and the port of the free end of the vertical section of the oil inlet pipe is positioned right above the vertical partition plate;
the air blowing mechanism comprises an air inlet pipe and an air blowing hoop provided with an air blowing opening and a communicating cavity, the air blowing hoop is horizontally fixed on the outer side wall of the reversing head along the joint of a main runner and a sub-runner of the reversing head, the communicating cavity communicated end to end along the circumference of the air blowing hoop is arranged in the air blowing hoop, a plurality of air blowing openings which are obliquely and downwards communicated with the cavity of the sub-runner of the reversing head and the communicating cavity of the air blowing hoop are uniformly arranged in the air blowing hoop, and the air inlet pipe communicated with the communicating cavity is respectively fixed on the two symmetrical side surfaces of the air blowing hoop;
the weighing box with the oil separator comprises an electronic balance, a weighing box fixed on the upper part of the electronic balance and the oil separator fixed in the weighing box, the weighing box is cylindrical, the upper end of the weighing box is opened, the bottom of the weighing box is fixed on a bearing surface of the electronic balance through a support, the bottom of the interior of the weighing box is in an inverted cone shape, an oil discharge pipe which is communicated with the interior of the weighing box and extends outwards is arranged at the conical tip of the inverted cone at the bottom, the oil discharge pipe is communicated into an oil tank through a pipeline, and an electromagnetic valve is arranged on the pipeline of the temperature change pipe in series; the oil separator comprises an umbrella-shaped oil separating cap and supporting legs, the bottom of the oil separating cap is vertically fixed on an inverted conical surface at the bottom of the weighing box through at least three supporting legs, the axis of the oil separating cap is collinear with the axis of the weighing box, a bus of the oil separating cap is in a concave arc shape, a lower port of a branch runner of the reversing head extends into the weighing box and is positioned right above the oil separating cap, a lower port of the other branch runner of the reversing head is positioned outside the weighing box, the lower port of the branch runner is communicated into the variable-temperature oil tank through a pipeline, and an included angle alpha of the inner surface of the bottom of the weighing box passing through a contour line of the section of a central line is 90 degrees;
the method for calibrating the variable viscosity lubricating oil micro flow meter by adopting the variable viscosity lubricating oil micro flow standard device comprises the following steps:
firstly, connecting a detected flowmeter and a standard flowmeter with the same model in series on a detection branch A and a detection branch B;
adjusting the temperature of the variable temperature oil tank to a corresponding temperature according to the relation between the viscosity and the temperature of the oil, wherein the viscosity of the oil at the temperature is the viscosity of the oil required by the test, opening each control valve, starting an oil pump to pump the oil in the variable temperature oil tank into each system, then directly returning the oil to the variable temperature oil tank through a shunt outside a reversing head, and circulating the oil in each system to accelerate the temperature change of the oil;
thirdly, when the temperature of the oil in the variable-temperature oil tank reaches a specified temperature, the oil is pumped into the tank body from an oil inlet of the tank body through an oil pump and directly impacts on the air baffle plate, the oil is dispersed as far as possible so as to be convenient for discharging air in the oil, an overflow port is arranged on the upper end cover, a pressure stabilizing tank set is communicated through the overflow port and used for stabilizing the oil pressure of the tank body and an oil way, and the oil enters a filter screen for filtering and impurity removal;
discharging the oil through an oil outlet of the tank body, then entering a precise flow regulating valve, regulating the flow of a detection branch according to a standard flowmeter, performing combined regulation on the flow of a medium through three valve cores with different specifications, realizing precise regulation on the flow of the medium so as to meet the requirements of the test flow of the detected flowmeter and the standard flowmeter, and collecting related flow data when the oil with the flow meeting the experimental requirements sequentially passes through the detected flowmeter and the standard flowmeter;
fifthly, the oil enters a reversing weighing system to weigh the oil, an oil inlet pipe is pushed to a corresponding diversion channel of a reversing head above a weighing box through a reversing cylinder, the oil enters the reversing head through the oil inlet pipe and enters the weighing box from the diversion channel above the weighing box, and the oil flows out of the diversion channel of the reversing head, disperses on the upper surface of an oil distributing cap and slides along the inner side surface of the weighing box to the weighing box;
when the oil flow is measured, the air inlet pipe of the air blowing mechanism is communicated with an air source, air is blown into a sub-channel of the reversing head through each air blowing port of the air blowing mechanism, and the oil adhered to the inner wall of the reversing head is blown out of the reversing head and enters the weighing box;
and seventhly, weighing the oil in the weighing box by using an electronic balance, discharging the oil into a temperature-changing oil tank through an oil discharge pipe after weighing is finished, and finally, comprehensively calculating to realize detection and calibration of the detected flow according to the data detected by the detected flowmeter and the standard flowmeter, the weight of the oil in the weighing box and the time of the oil passing through the detected flowmeter.
2. The method of claim 1, wherein the method comprises the steps of: the loose joint bolt comprises a screw rod hinged to the outer side wall of the tank body, a fixing lug horizontally fixed on the outer wall of the upper end cover and a nut matched with the screw rod, an installation bayonet matched with the screw rod is arranged at the free end of the fixing lug, the screw rod corresponds to the fixing lug in position and rotates to enable the screw rod to penetrate through the installation bayonet on the fixing lug, the upper end cover and the tank body are fixed in a sealing mode through screwing the nut, and a handle A is fixed on the nut.
3. The method of claim 1, wherein the method comprises the steps of: the arc-shaped path A, the arc-shaped path B and the arc-shaped path C are sections of parabolas or sections of ellipses.
4. The method of claim 3, wherein the method comprises the steps of: the arc-shaped path A, the arc-shaped path B and the arc-shaped path C are sections of parabolas, the top points of the parabolas are respectively positioned at the starting points of the arc-shaped path A, the arc-shaped path B and the arc-shaped path C, and the focuses of the parabolas are respectively positioned on the axes of the valve core A, the valve core B and the valve core C.
5. The method of claim 3, wherein the method comprises the steps of: the arc-shaped path A, the arc-shaped path B and the arc-shaped path C are sections of an ellipse, one vertex of the long axis of the ellipse is the starting point of the arc-shaped path A, the starting point of the arc-shaped path B and the starting point of the arc-shaped path C respectively, and the focus of the ellipse is on the axis of the valve core A, the axis of the valve core B and the axis of the valve core C respectively.
6. The method of claim 1, wherein the method comprises the steps of: a handle A is fixed on the free end of the valve rod A, a handle B is fixed on the free end of the valve rod B, and a handle C is fixed on the free end of the valve rod C.
7. The method of claim 1, wherein the method comprises the steps of: the reversing cylinder comprises a cylinder body and a piston rod, the cylinder body is horizontally fixed on the side face of the fixed plate through a small cantilever, and the free end of the piston rod is hinged to the connecting plate.
8. The method of claim 1, wherein the method comprises the steps of: and the detection branch circuit A and the detection branch circuit B are both connected in series with a thermometer and a pressure gauge.
9. The method of calibrating a variable viscosity oil micro-flow meter according to claim 1, wherein: control valves are connected in series on pipelines connected among the systems.
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