CN209745376U - variable viscosity lubricating oil micro-flow standard device - Google Patents
variable viscosity lubricating oil micro-flow standard device Download PDFInfo
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- CN209745376U CN209745376U CN201920604020.8U CN201920604020U CN209745376U CN 209745376 U CN209745376 U CN 209745376U CN 201920604020 U CN201920604020 U CN 201920604020U CN 209745376 U CN209745376 U CN 209745376U
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Abstract
the utility model relates to a small flow standard device of variable viscosity lubricating oil, the device includes the alternating temperature oil tank, driving system, steady voltage system, flow control system, detecting system and switching-over weighing system, adjust the temperature of the fluid of its inside splendid attire through the alternating temperature oil tank, thereby realize the regulation of fluid viscosity, the flowmeter that will be detected and the standard flowmeter who regards as the contrast establish ties in whole device, through the fluid pumping to each system of each the device in the driving system with the alternating temperature oil tank, fluid filters through the steady voltage and then passes through by the regulation of flow size and examine flowmeter and standard flowmeter, through weighing of the case of weighing again, get back to the alternating temperature oil tank in at last, viscosity and the flow size through changing fluid realize detecting and characteristic research to the flowmeter of difference.
Description
Technical Field
the invention relates to the technical field of flowmeter detection equipment, in particular to a variable viscosity lubricating oil micro-flow standard device.
background
the flowmeter is a common meter in the mechanical field, the common flowmeters comprise a turbine flowmeter and a gear flowmeter, the meter 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 are different, including meter linearity, repeatability and the like, regular detection and calibration are required for the flowmeter in use, so that the accuracy and safety of the flowmeter are ensured, particularly in the field of aviation, therefore, a standard device is urgently needed for detecting the use characteristics of the flowmeter in media with different viscosities and different flow, the problem that the use of the flowmeter needs attention is summarized, and accurate measurement and use methods are provided for 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 standard device.
the specific contents are as follows: 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 in the warp direction is arranged on the inner wall of the tank body, and the annular lug is vertically;
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 another branch runner of the reversing head is positioned outside the weighing box, and the lower port of the branch runner is communicated into the variable-temperature oil tank through a pipeline.
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 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.
preferably, the detection branch A and the detection branch 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:
in the pressure stabilizing system, oil enters a tank body through an oil inlet and directly impacts an air baffle plate, the oil is scattered as far as possible so as to conveniently discharge air in the oil, detection experiments are avoided being influenced, an overflow port is formed in an upper end cover, a pressure stabilizing tank group is communicated through the overflow port and used for stabilizing the oil pressure of the tank body and an oil way, the oil enters a filter screen for filtering 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 therefore the requirement of the detected flow of a 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 system 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, an oil inlet device 62, a weighing box with an oil separator, 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 912, a thermometer, a pressure gauge 913 and 923, a detected flow meter A and 922, a detected flow meter B and 914, a standard flow meter A and 924, a standard flow meter B and 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 an air blowing cylinder, 612, a cylinder body of the air blowing 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 standard 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;
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 in the warp direction is arranged on the inner wall of the tank body, and the annular lug is vertically;
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 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 and the axis of the weighing box are collinear, a bus of the oil separating cap is in a concave arc shape, oil entering from the oil inlet pipe can slide along the upper surface of the oil separating cap as far as possible, the oil is prevented from being lifted and splashing, a lower port of a flow passage of the reversing head extends into the weighing box and is located right above the oil separating cap, a lower port of another flow passage of the reversing head is located outside the weighing box, and the lower port of the flow passage of the reversing head is communicated into the variable-temperature oil tank through a pipeline.
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 detection branch circuit A and the detection branch circuit B are both 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.
the working process and principle of the invention are as follows:
The detection branch circuit A and the detection branch circuit B are both connected in series with a detected flowmeter and a standard flowmeter which have the same model, the temperature of the variable temperature oil tank is adjusted to the corresponding temperature according to the relation between the viscosity and the temperature of the oil, the viscosity of the oil at the temperature corresponds to the viscosity required by the test, the oil pump is started to pump the oil in the variable temperature oil tank into each system, the variable temperature of the oil is accelerated, when the temperature of the oil in the variable temperature oil tank reaches the specified temperature, the oil is pumped into the tank body from an oil inlet of the tank body through the oil pump and directly impacts on a gas baffle, the oil is scattered as far as possible so as to discharge the air in the oil, the detection test is prevented from being influenced, an overflow port is arranged on the upper end cover, a pressure stabilizing tank group is communicated through the overflow port and used for stabilizing the oil pressure of the tank body and an oil way, the oil enters the filter, flow regulation is carried out according to a standard flowmeter, flow of a medium is combined and regulated through three valve cores with different specifications, accurate regulation of medium flow is realized, the requirement of test flow of a tested flowmeter and the standard flowmeter is met, oil reaching the flow required by the test sequentially passes through the tested flowmeter and the standard flowmeter, relevant flow data are collected, then the oil enters a reversing weighing system, the oil is weighed, an oil inlet pipe is pushed to a corresponding branch passage 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 branch passage above the weighing box, the oil flows out from the branch passage of the reversing head, is dispersed along the upper surface of an oil distributing 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 improved, and the oil is prevented from splashing, make to weigh more accurately and protect electronic balance, after the oil flow measurement, the air supply is put through to the intake pipe of gas blowing mechanism, blow to the subchannel of switching-over head in through each gas blow mouth of gas blowing mechanism, the fluid that will glue on the switching-over head inner wall blows off the switching-over head and gets into the case of weighing, reduce experimental data unnecessary error, thereby reachs more accurate experimental result, then weigh through the fluid in the electronic balance weighing box, discharge fluid into the oil tank through the oil drain pipe after weighing, according to the data that are examined flowmeter and standard flowmeter detection and the weight of the interior fluid of weighing box, and the time that fluid process the flowmeter of examining, the detection and the calibration of the volume of examining of final comprehensive calculation realization.
Claims (10)
1. 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 in the warp direction is arranged on the inner wall of the tank body, and the annular lug is vertically;
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 another branch runner of the reversing head is positioned outside the weighing box, and the lower port of the branch runner is communicated into the variable-temperature oil tank through a pipeline.
2. the variable viscosity oil micro flow rate standard device according to claim 1, wherein: 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 variable viscosity oil micro flow rate standard device according to claim 1, wherein: 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 variable viscosity oil micro flow rate standard device according to claim 3, wherein: 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 variable viscosity oil micro flow rate standard device according to claim 3, wherein: 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 variable viscosity oil micro flow rate standard device according to claim 1, wherein: 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 variable viscosity oil micro flow rate standard device according to claim 1, wherein: 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 variable viscosity oil micro flow rate standard device according to claim 1, wherein: 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.
9. the variable viscosity oil micro flow rate standard device according to claim 1, wherein: the detection branch circuit A and the detection branch circuit B are both connected in series with a thermometer and a pressure gauge.
10. the variable viscosity oil micro flow rate standard device according to claim 1, wherein: control valves are connected in series on pipelines connected among the systems.
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| CN201920604020.8U CN209745376U (en) | 2019-04-29 | 2019-04-29 | variable viscosity lubricating oil micro-flow standard device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110081955A (en) * | 2019-04-29 | 2019-08-02 | 新乡航空工业(集团)有限公司 | Variable viscosity lubricating oil micro-flow meter calibration method |
| CN110081956A (en) * | 2019-04-29 | 2019-08-02 | 新乡航空工业(集团)有限公司 | Variable viscosity lubricating oil micro flow standard device |
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2019
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110081955A (en) * | 2019-04-29 | 2019-08-02 | 新乡航空工业(集团)有限公司 | Variable viscosity lubricating oil micro-flow meter calibration method |
| CN110081956A (en) * | 2019-04-29 | 2019-08-02 | 新乡航空工业(集团)有限公司 | Variable viscosity lubricating oil micro flow standard device |
| CN110081955B (en) * | 2019-04-29 | 2020-09-25 | 新乡航空工业(集团)有限公司 | Method for detecting variable viscosity lubricating oil micro-flowmeter |
| CN110081956B (en) * | 2019-04-29 | 2024-05-10 | 航空工业(新乡)计测科技有限公司 | Variable viscosity lubricating oil micro-flow standard device |
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