CN106643992B - No. 15 aviation hydraulic oil micro-flow standard device - Google Patents
No. 15 aviation hydraulic oil micro-flow standard device Download PDFInfo
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- CN106643992B CN106643992B CN201611238856.8A CN201611238856A CN106643992B CN 106643992 B CN106643992 B CN 106643992B CN 201611238856 A CN201611238856 A CN 201611238856A CN 106643992 B CN106643992 B CN 106643992B
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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
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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
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Abstract
The invention discloses a 15 # aviation hydraulic oil micro-flow standard device, which comprises a constant-temperature oil tank, a constant-temperature oil tank oil pump, a three-way regulating valve and a heat exchanger; an oil outlet of the constant-temperature oil tank is connected with an oil pump of the constant-temperature oil tank through a pipeline, an oil outlet of the oil pump of the constant-temperature oil tank is connected with a left port of a three-way regulating valve, a right port of the three-way regulating valve is connected with an inlet end of a first stop valve, an outlet end of the first stop valve is connected with a left end inlet of a heat exchanger, a right end outlet of the heat exchanger is connected with a tested flowmeter, an upper port of the three-way regulating valve is connected with an upper end inlet of the heat exchanger through a temperature-varying oil outlet pipe, and an upper end outlet of the heat exchanger is connected with an oil return port of the constant-temperature oil tank through a temperature-varying oil return pipe; the other end of the detected flowmeter is connected with an oil outlet device through a pipeline, the lower end of the oil outlet device is provided with a small-diameter nozzle, the lower end of the small-diameter nozzle is provided with a weighing box, and the weighing box is arranged on the upper end face of the weighing apparatus. The invention can directly meter the volume flow and the mass flow, and has higher metering accuracy.
Description
Technical Field
The invention belongs to the technical field of flow detection equipment, and mainly relates to a No. 15 aviation hydraulic oil micro-flow standard device.
Background
The flow unit is divided into mass flow and volume flow, the mass flow and the volume flow are converted through the density of the fluid, the density precision acquisition difficulty is high, and a large error is caused by the conversion of the introduced density; in addition, the lower flow limit of some special-purpose flowmeters is small, and the temperature requirement on the experimental medium is met. The existing hydraulic oil flow standard device adopts a single working principle, can only directly obtain one of standard volume flow or standard mass flow, and can obtain the standard mass flow and the volume flow only by adopting medium density conversion, and the conversion error is brought by the introduction of a density value, so that the accuracy of flow metering is reduced. In addition, the existing device has large flow lower limit value and narrow temperature change range, and can not completely meet the experimental requirements of the special purpose flowmeter.
Disclosure of Invention
In order to solve the technical problems, the invention provides a 15 # aviation hydraulic oil micro-flow standard device which integrates a mass method and a volume method and has a wide temperature-adjustable range.
The technical scheme of the invention is as follows:
a15-number aviation hydraulic oil micro-flow standard device comprises a constant-temperature oil tank, a constant-temperature oil tank oil pump, a three-way regulating valve and a heat exchanger; an oil outlet of the constant-temperature oil tank is connected with an oil pump of the constant-temperature oil tank through a pipeline, an oil outlet of the oil pump of the constant-temperature oil tank is connected with a left port of a three-way regulating valve, a right port of the three-way regulating valve is connected with an inlet end of a first stop valve, an outlet end of the first stop valve is connected with a left end inlet of a heat exchanger, a right end outlet of the heat exchanger is connected with a tested flowmeter, an upper port of the three-way regulating valve is connected with an upper end inlet of the heat exchanger through a temperature-varying oil outlet pipe, and an upper end outlet of the heat exchanger is connected with an oil return port of the constant-temperature oil tank through a temperature-varying oil return pipe; the other end of the detected flowmeter is connected with an oil outlet device through a pipeline, the lower end of the oil outlet device is provided with a small-diameter nozzle, the lower end of the small-diameter nozzle is provided with a weighing box, and the weighing box is arranged on the upper end face of the weighing apparatus; an oil liquid extracting device is arranged above the weighing box, and an oil suction pipe is arranged at the lower end of the oil liquid extracting device; the side wall of the pipeline between the first stop valve and the heat exchanger is connected with a second stop valve through a pipeline, and the second stop valve is connected with a piston oil delivery device.
Preferably, the oil liquid outlet device comprises a mechanical reversing valve, a transverse cylinder and a first electromagnetic reversing valve, wherein the other end of the detected flowmeter is connected with the inlet end of the mechanical reversing valve through a pipeline, the left outlet end of the mechanical reversing valve is connected to a collecting oil tank through a bypass pipe, the right outlet end of the mechanical reversing valve is connected with a weighing oil pipe, the lower end of the weighing oil pipe is connected with a transition joint, the lower end of the transition joint is connected with a small-diameter nozzle, and the small-diameter nozzle is positioned above or inserted into the weighing tank; the driving shaft of the mechanical reversing valve is fixedly connected with the transverse piston rod of the transverse air cylinder through a joint, the left cylinder of the transverse air cylinder is communicated with the left upper port of the first electromagnetic reversing valve through a left air pipe, the right cylinder of the transverse air cylinder is communicated with the right upper port of the first electromagnetic reversing valve through a right air pipe, the left lower port of the first electromagnetic reversing valve is connected with a left horizontally bent air-entraining pipe, the air outlet of the air-entraining pipe is arranged at one side of the weighing oil pipe, the right lower port of the first electromagnetic reversing valve is connected with a first air inlet pipe, the other end of the first air inlet pipe is connected with a first gas generator,
preferably, the oil liquid extracting device comprises a self-priming pump, a vertical cylinder and a second electromagnetic reversing valve, wherein the lower end of the self-priming pump is connected with an oil return pipe and an oil suction pipe, the oil return pipe is communicated with the oil suction pipe, and the oil return pipe is connected to a collecting oil tank; the vertical cylinder is arranged right above the weighing box, the lower end of a vertical piston rod of the vertical cylinder is connected with an oil pipe fixing block, the oil suction pipe is clamped in the oil pipe fixing block, and the lower end of the oil suction pipe is connected with an oil suction head; the inlet end of the second electromagnetic directional valve is connected with a second air inlet pipe, the other end of the second air inlet pipe is connected with a second gas generator, the left outlet end of the second electromagnetic directional valve is communicated with the lower cylinder of the vertical cylinder through a lower end air pipe, and the right outlet end of the second electromagnetic directional valve is communicated with the upper cylinder of the vertical cylinder through an upper end air pipe.
Preferably, the piston oil delivery device comprises a base, a double-shaft double-acting piston cylinder, a first one-way valve, an oil discharge pipe, a second one-way valve, an oil tank oil suction pipe, a third one-way valve and a fourth one-way valve; the double-shaft double-acting piston cylinder is fixedly arranged on the upper end surface of the base, piston rods are respectively penetrated at the left end and the right end of the double-shaft double-acting piston cylinder, a piston sliding along the length direction of the inner cavity is penetrated in the inner cavity of the double-shaft double-acting piston cylinder in a sliding manner, and the two piston rods are respectively and correspondingly fixedly connected at the left side and the right side of the piston; the side wall of the double-shaft double-acting piston cylinder, which is close to the left end, is provided with a left oil hole communicated with the inner cavity, the left oil hole is communicated with an oil inlet of a first one-way valve and an oil outlet of a second one-way valve through pipelines, the oil outlet of the first one-way valve is connected to the inlet end of a second stop valve through an oil discharge pipe, and the oil inlet of the second one-way valve is connected to an oil storage tank through an oil tank oil suction pipe; the side wall of the double-shaft double-acting piston cylinder, which is close to the right end, is provided with a right oil hole communicated with the inner cavity, the right oil hole is communicated with an oil inlet of a fourth one-way valve and an oil outlet of a third one-way valve through pipelines, the oil outlet of the fourth one-way valve is connected to the inlet end of a second stop valve through an oil discharge pipe, and the oil inlet of the third one-way valve is connected to an oil tank through an oil tank oil suction pipe; the upper end face of the base is provided with a servo motor, an electric sliding table is fixedly arranged on the upper end face of the base between the servo motor and the double-shaft double-acting piston cylinder, a screw rod which is parallel to a piston rod of the double-shaft double-acting piston cylinder is arranged on the electric sliding table, a sliding block is sleeved on the screw rod, an internal thread matched with the screw rod is arranged on the sliding block, a first bracket is fixedly sleeved on the piston rod of the double-shaft double-acting piston cylinder corresponding to the sliding block, and the sliding block is fixedly connected with the piston rod of the double-shaft double-acting piston cylinder through the first bracket; and a grating parallel to the screw rod is fixedly arranged on the base at one side of the electric sliding table, and a sliding contact of the grating is fixedly connected with a sliding block of the electric sliding table through a second bracket.
The beneficial effects of the invention are as follows:
compared with the prior art, the invention has the following advantages:
1. the volume flow and the mass flow can be directly measured without density conversion, and the measurement accuracy is higher;
2. the temperature change range is wide, the temperature control precision is high, and the temperature change experiment requirement can be met;
3. the lower limit of the flow is low, and the requirement of micro flow measurement can be met.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
in the figure: the device comprises a constant-temperature oil tank 1, a constant-temperature oil tank oil pump 2, a three-way regulating valve 3, a first stop valve 4, a heat exchanger 5, a detected flowmeter 6, an oil outlet device 7, an oil extraction device 8, a piston oil delivery device 9, a second stop valve 10, a variable-temperature oil outlet pipe 11, a variable-temperature oil return pipe 12, a weighing box 13, a weighing apparatus 14 and a collecting oil tank 15;
701 is a small-diameter nozzle, 702 is a transition joint, 703 is a weighing oil pipe, 704 is a mechanical reversing valve, 705 is a bypass pipe, 706 is a bleed air pipe, 707 is a first electromagnetic reversing valve, 708 is a first air inlet pipe, 709 is a right air pipe, 710 is a left air pipe, 711 is a transverse air cylinder, 712 is a transverse piston rod, 713 is a driving shaft, 714 is a joint, 715 is a timing trigger, and 7151 is a deflector rod;
801 is a self-priming pump, 802 is a vertical cylinder, 803 is an upper air pipe, 804 is a second air inlet pipe, 805 is a second electromagnetic reversing valve, 806 is a lower air pipe, 807 is an oil return pipe, 808 is an oil suction pipe, 809 is a vertical piston rod, 810 is an oil pipe fixing block, 811 is an oil suction head;
901 is double-shaft double-acting piston cylinder, 902 is first check valve, 903 is oil drain pipe, 904 is second check valve, 905 is oil tank oil drain pipe, 906 is third check valve, 907 is fourth check valve, 908 is first support, 909 is slider, 910 is electric slipway, 911 is servo motor, 912 is second support, 913 is grating, 914 is base.
Description of the embodiments
Referring to FIG. 1, a No. 15 aviation hydraulic oil micro-flow standard device comprises a constant-temperature oil tank, a constant-temperature oil tank oil pump, a three-way regulating valve and a heat exchanger; an oil outlet of the constant-temperature oil tank is connected with an oil pump of the constant-temperature oil tank through a pipeline, an oil outlet of the oil pump of the constant-temperature oil tank is connected with a left port of a three-way regulating valve, a right port of the three-way regulating valve is connected with an inlet end of a first stop valve, an outlet end of the first stop valve is connected with a left end inlet of a heat exchanger, a right end outlet of the heat exchanger is connected with a tested flowmeter, an upper port of the three-way regulating valve is connected with an upper end inlet of the heat exchanger through a temperature-varying oil outlet pipe, and an upper end outlet of the heat exchanger is connected with an oil return port of the constant-temperature oil tank through a temperature-varying oil return pipe; the other end of the detected flowmeter is connected with an oil outlet device through a pipeline, the lower end of the oil outlet device is provided with a small-diameter nozzle, the lower end of the small-diameter nozzle is provided with a weighing box, and the weighing box is arranged on the upper end face of the weighing apparatus; an oil liquid extracting device is arranged above the weighing box, and an oil suction pipe is arranged at the lower end of the oil liquid extracting device; the side wall of the pipeline between the first stop valve and the heat exchanger is connected with a second stop valve through a pipeline, and the second stop valve is connected with a piston oil delivery device.
Preferably, the oil liquid outlet device comprises a mechanical reversing valve, a transverse cylinder and a first electromagnetic reversing valve, wherein the other end of the detected flowmeter is connected with the inlet end of the mechanical reversing valve through a pipeline, the left outlet end of the mechanical reversing valve is connected to a collecting oil tank through a bypass pipe, the right outlet end of the mechanical reversing valve is connected with a weighing oil pipe, the lower end of the weighing oil pipe is connected with a transition joint, the lower end of the transition joint is connected with a small-diameter nozzle, and the small-diameter nozzle is positioned above or inserted into the weighing tank; the driving shaft of the mechanical reversing valve is fixedly connected with the transverse piston rod of the transverse air cylinder through a joint, the left cylinder of the transverse air cylinder is communicated with the left upper port of the first electromagnetic reversing valve through a left air pipe, the right cylinder of the transverse air cylinder is communicated with the right upper port of the first electromagnetic reversing valve through a right air pipe, the left lower port of the first electromagnetic reversing valve is connected with a left horizontally bent air-entraining pipe, the air outlet of the air-entraining pipe is arranged at one side of the weighing oil pipe, the right lower port of the first electromagnetic reversing valve is connected with a first air inlet pipe, the other end of the first air inlet pipe is connected with a first gas generator,
preferably, the oil liquid extracting device comprises a self-priming pump, a vertical cylinder and a second electromagnetic reversing valve, wherein the lower end of the self-priming pump is connected with an oil return pipe and an oil suction pipe, the oil return pipe is communicated with the oil suction pipe, and the oil return pipe is connected to a collecting oil tank; the vertical cylinder is arranged right above the weighing box, the lower end of a vertical piston rod of the vertical cylinder is connected with an oil pipe fixing block, the oil suction pipe is clamped in the oil pipe fixing block, and the lower end of the oil suction pipe is connected with an oil suction head; the inlet end of the second electromagnetic directional valve is connected with a second air inlet pipe, the other end of the second air inlet pipe is connected with a second gas generator, the left outlet end of the second electromagnetic directional valve is communicated with the lower cylinder of the vertical cylinder through a lower end air pipe, and the right outlet end of the second electromagnetic directional valve is communicated with the upper cylinder of the vertical cylinder through an upper end air pipe.
Preferably, the piston oil delivery device comprises a base, a double-shaft double-acting piston cylinder, a first one-way valve, an oil discharge pipe, a second one-way valve, an oil tank oil suction pipe, a third one-way valve and a fourth one-way valve; the double-shaft double-acting piston cylinder is fixedly arranged on the upper end surface of the base, piston rods are respectively penetrated at the left end and the right end of the double-shaft double-acting piston cylinder, a piston sliding along the length direction of the inner cavity is penetrated in the inner cavity of the double-shaft double-acting piston cylinder in a sliding manner, and the two piston rods are respectively and correspondingly fixedly connected at the left side and the right side of the piston; the side wall of the double-shaft double-acting piston cylinder, which is close to the left end, is provided with a left oil hole communicated with the inner cavity, the left oil hole is communicated with an oil inlet of a first one-way valve and an oil outlet of a second one-way valve through pipelines, the oil outlet of the first one-way valve is connected to the inlet end of a second stop valve through an oil discharge pipe, and the oil inlet of the second one-way valve is connected to an oil storage tank through an oil tank oil suction pipe; the side wall of the double-shaft double-acting piston cylinder, which is close to the right end, is provided with a right oil hole communicated with the inner cavity, the right oil hole is communicated with an oil inlet of a fourth one-way valve and an oil outlet of a third one-way valve through pipelines, the oil outlet of the fourth one-way valve is connected to the inlet end of a second stop valve through an oil discharge pipe, and the oil inlet of the third one-way valve is connected to an oil tank through an oil tank oil suction pipe; the upper end face of the base is provided with a servo motor, an electric sliding table is fixedly arranged on the upper end face of the base between the servo motor and the double-shaft double-acting piston cylinder, a screw rod which is parallel to a piston rod of the double-shaft double-acting piston cylinder is arranged on the electric sliding table, a sliding block is sleeved on the screw rod, an internal thread matched with the screw rod is arranged on the sliding block, a first bracket is fixedly sleeved on the piston rod of the double-shaft double-acting piston cylinder corresponding to the sliding block, and the sliding block is fixedly connected with the piston rod of the double-shaft double-acting piston cylinder through the first bracket; and a grating parallel to the screw rod is fixedly arranged on the base at one side of the electric sliding table, and a sliding contact of the grating is fixedly connected with a sliding block of the electric sliding table through a second bracket.
The working process comprises the following steps:
when the mass flow meter is calibrated, the liquid in the constant-temperature oil tank is regulated to the experimental temperature by adopting a weighing method principle, the oil pump of the constant-temperature oil tank operates to supply oil, the three-way regulating valve regulates the liquid flow in the experimental pipeline, and the shunted liquid enters the shell of the heat exchanger through the variable-temperature oil outlet pipe to exchange heat with the liquid in the experimental pipeline, so that the temperature of the liquid in the experimental pipeline can be regulated and stable when the liquid quality in the experimental pipeline is very small (namely, the experimental liquid sequentially flows through the oil pump of the constant-temperature oil tank, the three-way regulating valve, the first stop valve, the heat exchanger and the flow meter to be detected, and the liquid for heat exchange sequentially flows through the oil pump of the constant-temperature oil tank, the three-way regulating valve, the variable-temperature oil outlet pipe, the heat exchanger and the variable-temperature oil return pipe). The liquid with temperature and flow regulation passes through the detected flowmeter, so that the experimental requirements of the liquid on micro flow and temperature change are met, the liquid enters the mechanical reversing valve and flows into the collecting oil tank (the collecting oil tank and the constant-temperature oil tank can be the same oil tank) through bypass. When reversing, compressed gas sequentially enters the left cylinder of the transverse cylinder through the first air inlet pipe, the first electromagnetic reversing valve and the left air pipe, the piston of the transverse cylinder moves rightwards, the transverse piston rod pulls the driving shaft to move rightwards, the mechanical reversing valve is switched to a right position change-in state, liquid enters the weighing box along the flexible weighing oil pipe, and the flow velocity of the liquid is increased through the small-diameter nozzle at the lower end of the weighing oil pipe to realize linear flow. When the mechanical reversing valve needs reversing, compressed gas sequentially enters the right cylinder of the transverse cylinder through the first air inlet pipe, the first electromagnetic reversing valve and the right air pipe, the piston of the transverse cylinder moves leftwards, the transverse piston rod pulls the driving shaft to move leftwards, the mechanical reversing valve is switched to a left change-out state, liquid flows into the collecting oil tank through the bypass, the gas in the left cylinder of the mechanical reversing valve sequentially passes through the left air pipe, the first electromagnetic reversing valve and the air entraining pipe and is finally discharged from the air outlet of the air entraining pipe, the air flow generated during change-out is blown by the air outlet of the air entraining pipe to blow the flexible weighing oil pipe, the weighing oil pipe swings to the inner wall of the weighing box, the wall hanging of the small-diameter nozzle is eliminated through the contact between the small-diameter nozzle and the inner wall of the weighing box, and the weighing and reversing precision is improved. After weighing is completed, starting a liquid extraction device, enabling compressed gas to sequentially enter an upper cylinder of a vertical cylinder through a second air inlet pipe, a second electromagnetic reversing valve and an upper air pipe, enabling a vertical piston rod to move downwards, enabling an oil suction pipe to be driven by an oil pipe fixing block to move downwards, enabling a self-sucking pump to start sucking oil when an oil suction head at the lower end of the oil suction pipe enters the bottom of a weighing box, and enabling liquid to finally enter a collecting oil tank through the oil suction pipe and an oil return pipe (the collecting oil tank and a constant-temperature oil tank can be the same oil tank); after oil absorption is finished, compressed gas sequentially enters the lower cylinder of the vertical cylinder through the second air inlet pipe, the second electromagnetic reversing valve and the lower air pipe, the vertical piston rod moves upwards, the oil absorption pipe is pulled out of the weighing box, and the self-priming pump stops oil absorption.
When the volumetric flow meter and the speed flow meter are calibrated by adopting the volumetric principle, the first stop valve is closed, the second stop valve is opened, and the piston oil delivery device is started. The servo motor uniformly and repeatedly rotates forward and backward within a set travel range according to a set speed, the servo motor drives the sliding block and the piston on the sliding table to reciprocate at a uniform speed within the set travel range according to a corresponding speed, the piston pushes liquid in the piston cylinder to be discharged through the one-way valve, the liquid sequentially flows through the second stop valve, the heat exchanger, the detected flowmeter and the mechanical reversing valve (at the moment, the mechanical reversing valve is in a left-position change-out state), and finally flows into the collecting oil tank through the bypass (the collecting oil tank and the constant-temperature oil tank can be the same oil tank). If the temperature of the liquid needs to be kept, the constant-temperature oil tank oil pump is started while the piston oil delivery device is started, and the liquid for heat exchange sequentially flows through the constant-temperature oil tank oil pump, the three-way regulating valve, the variable-temperature oil outlet pipe, the heat exchanger and the variable-temperature oil return pipe.
When the piston moves leftwards, oil is discharged from a left cavity and absorbed from a right cavity of the double-shaft double-acting piston cylinder, and liquid in the left cavity sequentially passes through a first one-way valve, an oil discharge pipe, a detected flowmeter and a mechanical reversing valve and finally flows into a collecting oil tank through bypass; the liquid in the constant temperature oil tank sequentially passes through the oil suction pipe of the oil tank and the third one-way valve to reach the right cavity of the double-shaft double-acting piston cylinder. When the left set position is reached, the sliding table, the sliding block and the piston automatically switch to operate in the opposite direction, at the moment, the oil is discharged from the right cavity, the left cavity absorbs the oil, and the liquid in the right cavity sequentially passes through the fourth one-way valve, the oil discharge pipe, the detected flowmeter and the mechanical reversing valve and finally flows into the collecting oil tank through the bypass; the liquid in the constant temperature oil tank sequentially passes through the oil suction pipe of the oil tank and the second one-way valve to reach the left cavity of the double-shaft double-acting piston cylinder. The oil is discharged from one side of the piston and is absorbed from the other side of the piston, and the experiment is a coherent process, so that the efficiency is high, and in addition, the check valves arranged at the two outlets of the piston cylinder can be automatically opened and closed according to the movement direction of the piston, so that manual operation is not needed, and the use is convenient.
The above examples are merely illustrative of the preferred embodiments of the present invention, and various modifications and improvements to the technical solution of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the modifications and improvements fall within the scope of the invention as defined in the appended claims.
Claims (1)
1. A15-number aviation hydraulic oil micro-flow standard device is characterized by comprising a constant-temperature oil tank, a constant-temperature oil tank oil pump, a three-way regulating valve and a heat exchanger; an oil outlet of the constant-temperature oil tank is connected with an oil pump of the constant-temperature oil tank through a pipeline, an oil outlet of the oil pump of the constant-temperature oil tank is connected with a left port of a three-way regulating valve, a right port of the three-way regulating valve is connected with an inlet end of a first stop valve, an outlet end of the first stop valve is connected with a left end inlet of a heat exchanger, a right end outlet of the heat exchanger is connected with a tested flowmeter, an upper port of the three-way regulating valve is connected with an upper end inlet of the heat exchanger through a temperature-varying oil outlet pipe, and an upper end outlet of the heat exchanger is connected with an oil return port of the constant-temperature oil tank through a temperature-varying oil return pipe; the other end of the detected flowmeter is connected with an oil outlet device through a pipeline, the lower end of the oil outlet device is provided with a small-diameter nozzle, the lower end of the small-diameter nozzle is provided with a weighing box, and the weighing box is arranged on the upper end face of the weighing apparatus; an oil liquid extracting device is arranged above the weighing box, and an oil suction pipe is arranged at the lower end of the oil liquid extracting device; the side wall of the pipeline between the first stop valve and the heat exchanger is connected with a second stop valve through a pipeline, and the second stop valve is connected with a piston oil delivery device;
the oil outlet device comprises a mechanical reversing valve, a transverse cylinder and a first electromagnetic reversing valve, the other end of the detected flowmeter is connected with the inlet end of the mechanical reversing valve through a pipeline, the left outlet end of the mechanical reversing valve is connected to a collecting oil tank through a bypass pipe, the right outlet end of the mechanical reversing valve is connected with a weighing oil pipe, and the weighing oil pipe is flexible; the lower end of the weighing oil pipe is connected with a transition joint, the lower end of the transition joint is connected with a small-diameter nozzle, and the small-diameter nozzle is positioned above the weighing box or inserted into the weighing box; the driving shaft of the mechanical reversing valve is fixedly connected with a transverse piston rod of a transverse air cylinder through a joint, a left cylinder of the transverse air cylinder is communicated with the left upper port of the first electromagnetic reversing valve through a left air pipe, a right cylinder of the transverse air cylinder is communicated with the right upper port of the first electromagnetic reversing valve through a right air pipe, the left lower port of the first electromagnetic reversing valve is connected with a left horizontally bent air-entraining pipe, the air outlet of the air-entraining pipe is arranged on one side of a weighing oil pipe, the right lower port of the first electromagnetic reversing valve is connected with a first air inlet pipe, and the other end of the first air inlet pipe is connected with a first gas generator;
the oil liquid extraction device comprises a self-priming pump, a vertical cylinder and a second electromagnetic reversing valve, wherein the lower end of the self-priming pump is connected with an oil return pipe and an oil suction pipe, the oil return pipe is communicated with the oil suction pipe, and the oil return pipe is connected to a collecting oil tank; the vertical cylinder is arranged right above the weighing box, the lower end of a vertical piston rod of the vertical cylinder is connected with an oil pipe fixing block, the oil suction pipe is clamped in the oil pipe fixing block, and the lower end of the oil suction pipe is connected with an oil suction head; the inlet end of the second electromagnetic directional valve is connected with a second air inlet pipe, the other end of the second air inlet pipe is connected with a second gas generator, the left outlet end of the second electromagnetic directional valve is communicated with the lower cylinder of the vertical cylinder through a lower end air pipe, and the right outlet end of the second electromagnetic directional valve is communicated with the upper cylinder of the vertical cylinder through an upper end air pipe;
the piston oil delivery device comprises a base, a double-shaft double-acting piston cylinder, a first one-way valve, an oil discharge pipe, a second one-way valve, an oil tank oil suction pipe, a third one-way valve and a fourth one-way valve; the double-shaft double-acting piston cylinder is fixedly arranged on the upper end surface of the base, piston rods are respectively penetrated at the left end and the right end of the double-shaft double-acting piston cylinder, a piston sliding along the length direction of the inner cavity is penetrated in the inner cavity of the double-shaft double-acting piston cylinder in a sliding manner, and the two piston rods are respectively and correspondingly fixedly connected at the left side and the right side of the piston; the side wall of the double-shaft double-acting piston cylinder, which is close to the left end, is provided with a left oil hole communicated with the inner cavity, the left oil hole is communicated with an oil inlet of a first one-way valve and an oil outlet of a second one-way valve through pipelines, the oil outlet of the first one-way valve is connected to the inlet end of a second stop valve through an oil discharge pipe, and the oil inlet of the second one-way valve is connected to an oil storage tank through an oil tank oil suction pipe; the side wall of the double-shaft double-acting piston cylinder, which is close to the right end, is provided with a right oil hole communicated with the inner cavity, the right oil hole is communicated with an oil inlet of a fourth one-way valve and an oil outlet of a third one-way valve through pipelines, the oil outlet of the fourth one-way valve is connected to the inlet end of a second stop valve through an oil discharge pipe, and the oil inlet of the third one-way valve is connected to an oil tank through an oil tank oil suction pipe; the upper end face of the base is provided with a servo motor, an electric sliding table is fixedly arranged on the upper end face of the base between the servo motor and the double-shaft double-acting piston cylinder, a screw rod which is parallel to a piston rod of the double-shaft double-acting piston cylinder is arranged on the electric sliding table, a sliding block is sleeved on the screw rod, an internal thread matched with the screw rod is arranged on the sliding block, a first bracket is fixedly sleeved on the piston rod of the double-shaft double-acting piston cylinder corresponding to the sliding block, and the sliding block is fixedly connected with the piston rod of the double-shaft double-acting piston cylinder through the first bracket; and a grating parallel to the screw rod is fixedly arranged on the base at one side of the electric sliding table, and a sliding contact of the grating is fixedly connected with a sliding block of the electric sliding table through a second bracket.
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| CN108757184A (en) * | 2018-04-16 | 2018-11-06 | 南京航空航天大学 | The accurate feed system of small amount of fuel based on piston and hydraulic cylinder |
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