阅读说明：本技术 一种发动机气门油封泄漏测量方法以及装置 (Engine valve oil seal leakage measuring method and device ) 是由 王越 黄雪青 杜学军 瞿晓君 于 2021-06-22 设计创作，主要内容包括：本发明涉及一种发动机气门油封泄漏测量方法以及装置,装置模拟发动机(不点火)在台架运行时的工况,对被测发动机缸盖通氦气,并自主设计集气装置装在进、排气门接口,对氦气进行收集,来对渗漏进行有效定量测量。有效的解决发动机在各个工况下多个零部件因临界区域的交互作用而无法判定引起机油耗高的异常现象,还可以用来测量内燃机瞬态工况下气门油封泄漏量。可对发动机缸盖中气门油封进行精确的密封性测量和检测,该装置精度高、测量速度快,适用于汽油和柴油发动机。特别是在发动机开发、制造生产、维修阶段的机油消耗测量和检测。(The invention relates to a method and a device for measuring leakage of an engine valve oil seal, wherein the device simulates the working condition of an engine (not ignited) during the operation of a rack, helium is introduced into a cylinder cover of the engine to be measured, and a gas collecting device is designed to be arranged at an inlet valve interface and an exhaust valve interface independently to collect the helium so as to effectively and quantitatively measure leakage. The abnormal phenomenon that engine oil consumption is high due to the fact that interaction of a plurality of parts of the engine in critical areas cannot be judged under various working conditions is effectively solved, and the valve oil seal leakage rate under the transient working condition of the internal combustion engine can be measured. The device can be used for accurately measuring and detecting the air valve oil seal in the cylinder cover of the engine, has high precision and high measuring speed, and is suitable for gasoline and diesel engines. Especially in the engine development, manufacturing and maintenance stages.)

1. A method for measuring leakage of engine valve oil seal is characterized in that a cylinder cover of an engine to be measured is fixedly arranged on a cylinder cover adapting device to form a cylinder cover assembly, output shafts of an air inlet camshaft motor and an air outlet camshaft motor drive an air inlet camshaft and an air outlet camshaft in the cylinder cover assembly to rotate, and a combustion chamber and a temperature control device in the cylinder cover adapting device are matched to simulate normal operation working conditions of the engine; the cylinder cover assembly is plugged with other external interfaces except for the lubricating unit and a crankcase ventilation pipe interface, pressurized helium is sucked through the crankcase ventilation pipe interface, the gas inlet side and the gas outlet side of the tested engine cylinder cover collect leaked gas of a valve oil seal through a gas collecting device, the collected gas is sent into a helium mass spectrum leakage detecting unit through a detection pipeline, and the helium mass spectrum leakage detecting unit ionizes the gas and corresponds to different ion masses m and different ion deflection orbit radiuses R, namelyq is the ion charge amount, the motion deflection radiuses of ions with different mass-to-charge ratios are different, only helium ions are allowed to reach the collector through the ion filter, the measured ion flow, namely the leakage value, is expressed by current at the collector, and leakage detection of the valve oil seal is independently performed under dynamic control.

2. The method for measuring the leakage of the oil seal of the engine valve according to claim 1, wherein the helium mass spectrometer leak detection unit is characterized in that nano-scale micropores with helium permeability are uniformly etched on a quartz film layer in a detection chamber by adopting an etching technology, the pore size only allows helium molecules to permeate into the detection chamber, and the leakage rate is measured after the detection chamber ionizes the entering helium.

3. The cylinder cover adapting device used in the engine valve oil seal leakage measuring method of claim 1 or 2 is used for being assembled with the measured engine cylinder cover in a sealing mode and simulating and forming an engine working environment; the cylinder cover adapter device is divided into an upper layer and a lower layer, the upper layer is a combustion chamber, the combustion chamber is a combustion chamber pressurization cavity corresponding to each cylinder body of the engine cylinder cover to be tested, the lower layer is a hollow cavity used for storing engine oil, and the hollow cavity is connected with the lubricating unit through an oil inlet pipe and an oil outlet pipe.

4. The cylinder cover adapting device used in the engine valve oil seal leakage measuring method according to claim 3, wherein an external pressurization air pump is used for pumping pressure of 0bar to 30bar into each pressurization cavity according to the requirement of test working conditions, and the pressure in an air cylinder during the operation of an engine is simulated.

5. A gas collecting device used in the engine valve oil seal leakage measuring method of claim 1 or 2, characterized in that, a gas collecting device is connected to each inlet and exhaust valve conduit port of the cylinder cover to be measured, each gas collecting device comprises a gas collecting pipe (1504) and a gas collecting chamber (1505), the diameter of the gas collecting pipe (1504) is matched with the inlet and exhaust valve conduit ports, the gas collecting pipe (1504) is externally provided with a semi-cylinder gas collecting chamber (1505), the gas collecting pipe (1504) is provided with a plurality of gas collecting holes (1501) at one side communicated with the gas collecting chamber (1505), the lower part of the gas collecting chamber (1505) near the combustion chamber is provided with oil drain holes (1502), the outer wall of the gas collecting chamber (1505) is provided with a connecting hole (1503), and the connecting hole (1503) is connected with the detecting pipeline.

6. The gas collecting device used in the engine valve oil seal leakage measuring method according to claim 5, characterized in that the gas collecting hole (1501) is a helium gas collecting hole for collecting helium gas mixture leaked from between the inlet and outlet valve oil seal lip and the inlet and outlet valve.

7. The gas collecting device used in the method for measuring the oil seal leakage of the engine valve according to claim 5, characterized in that the gas collecting chamber (1505) is a pressure difference cavity between the air inlet valve and the air outlet valve and the detection pipeline, and gas oil separation is carried out in the chamber to filter the collected gas.

8. The device for measuring the leakage of the oil seal of the engine valve is characterized by comprising a cylinder cover adapting device, a helium tank, an air inlet side helium detection pipeline, an exhaust camshaft driving motor, an air inlet camshaft driving motor, a helium air inlet pipe, a helium ventilation cover, an exhaust side pipeline fixing device, an air inlet pipeline fixing device, an exhaust side helium detection pipeline, a lubricating unit, a helium mass spectrum leakage detection unit, a gas collecting device and a control system;

cylinder cap adapter device: the cylinder cover adapter device is internally provided with a combustion chamber and an integrated temperature control box, and the bottom of the cylinder cover adapter device is hollow and used for storing engine oil to simulate and form an engine working environment;

air inlet side helium gas detection pipeline: the helium mass spectrometer leak detection unit is used for introducing leaked helium collected by the air inlet side gas collecting device into the helium mass spectrometer leak detection unit;

air inlet side pipeline fixing device: the helium detection device is used for being matched with an air inlet surface of an exhaust end of an engine, screwing the air inlet surface after assembly and fixing a helium detection pipeline at an air inlet side;

exhaust camshaft drive motor: the device is used for driving the exhaust camshaft to reach the rotating speed required by measurement;

air intake camshaft driving motor: the device is used for driving the intake camshaft to reach the rotating speed required by measurement;

helium gas inlet pipe: the helium tank is used for connecting the helium gas bottle with the helium gas vent cover, so that helium gas is introduced into the cylinder cover of the engine to be tested;

helium gas vent cover: the helium tank is used for sealing an engine oil port cover of the engine, is communicated with a helium inlet pipe and is used for introducing helium in the helium tank into a cylinder cover of the engine to be tested;

exhaust side pipe fixing device: the device is used for being matched with an air inlet end and an air outlet surface of an engine, and is screwed up after being assembled to fix a helium gas detection pipeline at an air outlet side;

exhaust side helium gas detection line: the helium mass spectrometer leak detection unit is used for introducing leaked helium collected by the exhaust side gas collection device into the helium mass spectrometer leak detection unit;

a lubrication unit: the engine oil is stored in a hollow cavity at the lower layer of the cylinder cover adapter, and a lubricating oil circulation loop is formed in the cylinder cover assembly through the engine oil pump and the lubricating oil tank, so that the normal work of the valve mechanism is ensured;

helium mass spectrometer leak detection unit: the gas collecting device collects helium molecules, the helium molecules enter the helium mass spectrum leakage detecting unit through negative pressure, the quartz film layer in the detection chamber only allows the helium molecules to permeate into the detection chamber, and the helium amount is measured;

gas collection device: each air inlet valve and each air outlet valve guide pipe port of the cylinder cover to be tested are connected with an air collecting device for collecting helium;

the control system comprises: the temperature, the motors and the connecting valves between the gas channels are controlled.

Technical Field

The invention relates to the field of automobile engines, in particular to a method and a device for measuring leakage of an engine valve oil seal.

Background

In recent years, Gasoline engines, particularly Gasoline Direct Injection (GDI) engines, have become popular in the market due to their advantages such as high thermal efficiency and low fuel consumption. Research shows that a small amount of engine oil participates in combustion of in-cylinder fuel, particulate emission is remarkably increased, and the particulates emitted by an engine contain a large amount of metal elements from the engine oil, including Zn, Ca, Mg, Ba and the like, and the metal elements have certain influence on human health. Relevant researches and reports indicate that the direct injection gasoline engine, particularly the turbocharged direct injection gasoline engine, has a relatively obvious phenomenon of engine oil burning. And also affects fuel economy, exhaust emissions, power performance, reliability, service life, and maintenance costs.

Along with the increasingly strict automobile emission requirements and the national policy of energy conservation and emission reduction, particularly the requirement of the turbo direct injection engine on the valve oil seal at the present stage is more and more strict, the valve oil seal is required to better bear the conditions of high temperature, wear resistance and the like, and the engine has the performances of long service life, reliable sealing and the like.

At present, in the market, digital calipers, a projector, three-coordinate measurement, radial force detection, a leakage tester taking engine oil or air as a medium and finite element simulation analysis are mainly used for measuring and detecting the valve oil seal, and the methods are mainly based on static conditions, while a combustion chamber of a turbine direct injection engine is closely related to the dynamic control capacity of the valve oil seal in high-temperature (2000 ℃) and high-pressure (average effective pressure is 22bar) environments. And because the valve oil seal is a disposable assembly part and is a waste product after being normally assembled and disassembled, high-precision leakage testing equipment for the engine valve oil seal under static and dynamic control is lacked in the current market.

In order to further study the influence of engine oil consumption abnormity caused by valve oil seal leakage on the performance of an engine and the failure test of a valve oil seal, test equipment capable of simulating the valve oil seal leakage amount under the operation of each working condition of the engine is designed, and finally, the relationship between the valve oil seal leakage amount and the engine oil consumption in different failure states is obtained through the test of the test equipment. A large amount of calculation and simulation tests and the leakage amount under the dynamic control of the valve oil seal during the operation of the engine in reality have large errors, and moreover, the operation process and the simulation process are time-consuming and long, and the precision guarantee and the practicability are lacking on the whole.

Disclosure of Invention

In order to improve the efficiency of measuring the oil consumption of the engine and the test practicability, the method and the device for measuring the oil seal leakage of the engine valve are provided, the measuring and detecting cost is greatly saved, and the product development period is effectively shortened.

The technical scheme of the invention is as follows: a method for measuring leakage of engine valve oil seal is characterized in that a cylinder cover of an engine to be measured is fixedly arranged on a cylinder cover adapting device to form a cylinder cover assembly, an air inlet camshaft motor and an air outlet camshaft motor output shaft drive an air inlet camshaft and an air outlet camshaft in the cylinder cover assembly to rotate, and a combustion chamber and a temperature control device in the cylinder cover adapting device are matched to simulate normal operation working conditions of the engine; the cylinder cover assembly is plugged with other external interfaces except for the lubricating unit and a crankcase ventilation pipe interface, pressurized helium is sucked through the crankcase ventilation pipe interface, the gas inlet side and the gas outlet side of the tested engine cylinder cover collect leaked gas of a valve oil seal through a gas collecting device, the collected gas is sent into a helium mass spectrum leakage detecting unit through a detection pipeline, and the helium mass spectrum leakage detecting unit ionizes the gas and corresponds to different ion masses m and different ion deflection orbit radiuses R, namelyq is the amount of ion charge, the radius of motion deflection of ions with different mass-to-charge ratios is different, only helium ions are allowed to reach the collector through the ion filter, and current is used for the collectorThe measured ion flow, namely the leakage value is expressed, and leakage detection of the valve oil seal is independently performed under dynamic control.

Preferably, the helium mass spectrometer leak detection unit adopts an etching technology to uniformly etch nano-scale micropores with helium permeability on a quartz film layer in a detection chamber, the pore size only allows helium molecules to permeate into the detection chamber, and the leakage rate is measured after the detection chamber ionizes the entering helium.

A cylinder cover adapting device used in an engine valve oil seal leakage measuring method is used for being assembled with a measured engine cylinder cover in a sealing mode and simulating to form an engine working environment; the cylinder cover adapter device is divided into an upper layer and a lower layer, the upper layer is a combustion chamber, the combustion chamber is a combustion chamber pressurization cavity corresponding to each cylinder body of the engine cylinder cover to be tested, the lower layer is a hollow cavity used for storing engine oil, and the hollow cavity is connected with the lubricating unit through an oil inlet pipe and an oil outlet pipe.

Preferably, 0bar to 30bar of pressure is pumped into each pressurizing cavity through an external pressurizing air pump according to the requirement of test working conditions, and the pressure in the cylinder during the operation of the engine is simulated.

A gas collecting device used in the engine valve oil seal leakage measuring method is characterized in that each inlet and exhaust valve guide pipe opening of a cylinder cover to be measured is connected with a gas collecting device, each gas collecting device comprises a gas collecting pipe and a gas collecting cavity, the diameter of the gas collecting pipe is matched with the inlet and exhaust valve guide pipe openings, the gas collecting pipe is wrapped with a semi-cylinder gas collecting cavity, the gas collecting pipe is provided with a plurality of gas collecting holes communicated with the gas collecting cavity, the lower part of the gas collecting cavity is provided with oil drainage holes close to one side of a combustion chamber, the outer wall of the gas collecting cavity is provided with a connecting hole, and the connecting hole is connected with a detection pipeline.

Preferably, the gas collecting hole is a helium gas collecting hole and is used for collecting helium gas mixture leaked from the sealing lip of the oil seal of the air inlet valve and the air outlet valve and between the air inlet valve and the air outlet valve.

Preferably, the gas collecting chamber is a pressure difference cavity between the gas inlet valve and the gas outlet valve and the detection pipeline, and meanwhile, gas and oil separation is carried out in the chamber to filter collected gas.

An engine valve oil seal leakage measuring device comprises a cylinder cover adapting device, a helium bottle, an air inlet side helium detection pipeline, an exhaust cam shaft driving motor, an air inlet cam shaft driving motor, a helium air inlet pipe, a helium air vent cover, an exhaust side pipeline fixing device, an air inlet pipeline fixing device, an exhaust side helium detection pipeline, a lubricating unit, a helium mass spectrum leakage detecting unit, an air collecting device and a control system;

cylinder cap adapter device: the cylinder cover adapter device is internally provided with a combustion chamber and an integrated temperature control box, and the bottom of the cylinder cover adapter device is hollow and used for storing engine oil to simulate and form an engine working environment;

air inlet side helium gas detection pipeline: the helium mass spectrometer leak detection unit is used for introducing leaked helium collected by the air inlet side gas collecting device into the helium mass spectrometer leak detection unit;

air inlet side pipeline fixing device: the helium detection device is used for being matched with an air inlet surface of an exhaust end of an engine, screwing the air inlet surface after assembly and fixing a helium detection pipeline at an air inlet side;

exhaust camshaft drive motor: the device is used for driving the exhaust camshaft to reach the rotating speed required by measurement;

air intake camshaft driving motor: the device is used for driving the intake camshaft to reach the rotating speed required by measurement;

helium gas inlet pipe: the helium tank is used for connecting the helium gas bottle with the helium gas vent cover, so that helium gas is introduced into the cylinder cover of the engine to be tested;

helium gas vent cover: the helium tank is used for sealing an engine oil port cover of the engine, is communicated with a helium inlet pipe and is used for introducing helium in the helium tank into a cylinder cover of the engine to be tested;

exhaust side pipe fixing device: the device is used for being matched with an air inlet end and an air outlet surface of an engine, and is screwed up after being assembled to fix a helium gas detection pipeline at an air outlet side;

exhaust side helium gas detection line: the helium mass spectrometer leak detection unit is used for introducing leaked helium collected by the exhaust side gas collection device into the helium mass spectrometer leak detection unit;

a lubrication unit: the engine oil is stored in a hollow cavity at the lower layer of the cylinder cover adapter, and a lubricating oil circulation loop is formed in the cylinder cover assembly through the engine oil pump and the lubricating oil tank, so that the normal work of the valve mechanism is ensured;

helium mass spectrometer leak detection unit: the gas collecting device collects helium molecules, the helium molecules enter the helium mass spectrum leakage detecting unit through negative pressure, the quartz film layer in the detection chamber only allows the helium molecules to permeate into the detection chamber, and the helium amount is measured;

gas collection device: each air inlet valve and each air outlet valve guide pipe port of the cylinder cover to be tested are connected with an air collecting device for collecting helium;

the control system comprises: the temperature, the motors and the connecting valves between the gas channels are controlled.

The invention has the beneficial effects that: the method and the device for measuring the leakage of the oil seal of the engine valve effectively solve the problem of abnormal leakage caused by high oil consumption due to the fact that a plurality of parts of the engine cannot be judged due to the interaction of critical areas under various working conditions, and can also be used for measuring the transient working conditions of an internal combustion engine. The device can be used for accurately measuring and detecting the sealing performance of the cylinder cover assembly, has high precision and high measuring speed, and is suitable for gasoline and diesel engines. Especially in the engine development, manufacturing and maintenance stages.

Drawings

FIG. 1 is a schematic diagram of an engine oil consumption measuring device for an engine according to the present invention;

FIG. 2 is a cross-sectional view of the apparatus of the present invention showing the adapter of the cylinder head;

FIG. 3 is a schematic view of the connection position of the cylinder cover adapter and the lubricating oil pump of the device of the invention;

FIG. 4 is a schematic diagram of the position of a gas collecting device in the measuring device according to the present invention;

FIG. 5 is a schematic view of the gas collecting device of the present invention;

FIG. 6 is a schematic structural diagram of an engine oil consumption measuring device according to an embodiment of the present invention.

The attached drawings are as follows: 1. a cylinder cover adapting device; 101. a temperature control box; 102. a combustion chamber pressurization cavity; 2. a helium tank; 3. a helium gas detection pipeline at the air inlet side; 4. an exhaust camshaft drive motor; 5. an intake camshaft drive motor; 6. a helium gas inlet pipe; 7. a helium gas vent cover; 8. a cylinder cover; 9. an exhaust-side pipe fixing device; 10. an exhaust side helium gas detection pipeline; 11. an oil pump; 12. a work table; 13. a control panel; 14. a helium mass spectrometer leak detection unit; 15. a gas collection device; 1501. a gas collection hole; 1502. an oil drainage hole; 1503. connecting holes; 1504. a gas collecting pipe; 1505. a gas collection chamber.

Detailed Description

As shown in fig. 1, the engine oil consumption measuring device of the engine carries out an oil consumption test schematic diagram, a cylinder cover adapter device is designed, a measured cylinder cover is fixedly arranged on the cylinder cover adapter device to form a cylinder cover assembly, a driving unit comprises an air inlet camshaft motor and an air outlet camshaft motor, an output shaft of the motor drives an air inlet camshaft and an air outlet camshaft in the cylinder cover assembly to rotate, and a combustion chamber and a temperature control device in the cylinder cover adapter device are matched to simulate the normal operation working condition of the engine; the cylinder cover assembly is plugged with other external interfaces except for the lubricating unit and a crankcase ventilation pipe interface, pressurized helium is sucked through the crankcase ventilation pipe interface, the gas inlet side and the gas outlet side of a cylinder cover to be tested collect gas leaked from the valve oil seal through a gas collecting device, the collected gas is sent into a helium mass spectrum leakage detecting unit through a detection pipeline, and the helium mass spectrum leakage detecting unit reversely pushes the leakage condition of the valve oil seal to the helium amount in the leaked gas. Leakage detection is carried out on the leakage quantity of the valve oil seal independently under dynamic control.

The driving motor drives the air inlet cam shaft and the air outlet cam shaft to rotate, helium higher than atmospheric pressure is filled into the cylinder cover assembly by using the suction type helium mass spectrometer leak detector under the condition of simulating the normal operation condition of an engine, when the air valve oil seal leaks, the helium can leak into the air inlet channel and the air outlet channel through a gap, and then the helium concentration around the air valve oil seal in the air channel is measured by adopting a suction gun mode.

The helium mass spectrometer leak detection unit ionizes the gas and deflects the orbit radius R corresponding to different ion masses m and different ions, namelyq is the ion charge amount, the motion deflection radius of ions with different mass-to-charge ratios is different, only helium ions are allowed to reach the collector through the ion filter, and the measured ion flow is expressed by current at the collector, namely the current leakageAnd (4) leaking the value.

The helium mass spectrometer leak detection unit adopts an etching technology to uniformly etch nanometer micropores with helium permeability on a quartz film layer in a detection chamber, and the pore size only allows helium molecules to permeate into the detection chamber. The detection chamber ionizes the entered helium and then measures the current value, namely the leakage rate, and finally judges the oil consumption through statistical analysis. The equipment has the advantages of detection precision reaching 1.0E-7mbar L/s, short test time and capability of realizing static/dynamic test.

As shown in fig. 2 and 3, the cylinder cover adapting device comprises: the cylinder cover adapting device is divided into an upper layer and a lower layer, the upper layer is a combustion chamber, the combustion chamber is a combustion chamber pressurization cavity 102 corresponding to each cylinder body of the cylinder cover to be tested, the lower layer is a hollow cavity for storing engine oil, and the hollow cavity is connected with a lubricating unit through an oil inlet and outlet pipe 11. The inner wall of the hollow cavity is provided with a plurality of temperature control boxes 101, the temperature of engine oil of an engine is heated to 90 ℃ according to test requirements (the temperature of the oil required by an engine experiment) and the working temperature interval is kept through a temperature control device, so that the lubricating requirement of each part in the cylinder cover assembly under any working condition that the rotating speed of the camshaft runs to 0-3000 RPM is met. The combustion chamber may be pressurized to simulate cylinder pressure within the combustion chamber when the actual engine is running.

The cylinder cover to be tested mainly comprises a valve, a valve guide pipe, a valve oil seal, a valve spring upper seat, a valve locking plate, a hydraulic support, a rocker mechanism and a camshaft (part of the engine camshaft and a cylinder cover housing are integrated parts). Because the valve is wholly positioned at the upper side of the combustion chamber, the valve head extends and retracts downwards to form a pair of sliding friction pairs with the valve oil seal. The structure of the valve oil seal is mainly divided into an annular spiral spring, a main lip part of the valve oil seal and a metal area of the valve oil seal. Because the valve and the valve guide pipe do high-frequency reciprocating motion and adopt splash lubrication, the engine oil of the overhead valve mechanism can slowly flow into the combustion chamber along the valve guide rod. The valve oil seal is in interference fit with the valve guide rod, and in order to meet the requirement of lubrication between the valve guide rod and the valve guide pipe, a small amount of engine oil must pass through the valve oil seal, and meanwhile, the excessive engine oil is controlled not to enter the combustion chamber to participate in combustion. If the valve oil seal fails, such as the valve oil seal is hardened after high-temperature carbonization, seriously worn, the annular spiral spring fails, the metal area of the valve deforms and the like, engine oil can be sucked into a combustion chamber along a valve rod and the valve oil seal through sliding friction motion to cause an engine oil burning phenomenon, and meanwhile, the engine oil and mixed gas generate oil smoke and particles of burnt lubricating oil under the condition of incomplete combustion.

As shown in fig. 4, a schematic position diagram of the gas collecting device in the measuring device is shown, and for an example of an inline four-cylinder single-cylinder four-valve engine, a gas collecting device 15 is connected to each intake valve and exhaust valve conduit port of the cylinder cover to be measured, and in the diagram, 16 gas collecting devices 15 are provided. As shown in the structural diagram of the gas collecting device shown in fig. 5, each gas collecting device 15 includes a gas collecting pipe 1504 and a gas collecting chamber 1505, the diameter of the gas collecting pipe 1504 matches with the inlet and outlet valve guide openings, a semi-cylindrical gas collecting chamber 1505 is wrapped outside the gas collecting pipe 1504, a plurality of gas collecting holes 1501 (8 in two rows in fig. 5) are arranged on the gas collecting pipe 1504 and are communicated with the gas collecting chamber 1505, 1 oil drain hole 1502 is arranged at the lower part (close to the combustion chamber side) of the gas collecting chamber 1505, a connecting hole 1503 is arranged on the outer wall of the gas collecting chamber 1505, the connecting hole 1503 is connected with an inlet side helium detecting pipeline 3 (in fig. 4) or an outlet side helium detecting pipeline, wherein, the gas collecting hole 1501 is a helium gas collecting hole and is used for collecting gas (including helium gas and air) leaked between the inlet and outlet valve oil seal lips and the inlet and outlet valves, the collected gas is sucked into the inlet side helium detecting pipeline 3 and the outlet side helium detecting pipeline through negative pressure until a suction type mass spectrometer, and (4) separating helium from the gas by a helium mass spectrometer leak detector, and calculating the leakage amount. Each gas collecting device is provided with 8 gas collecting holes 1501 and 1 oil drainage hole 1502, the 8 gas collecting holes 1501 are used for collecting leaked gas, the collected gas is led out through a connecting hole 1503 in a gas collecting cavity 1505, and the oil drainage holes 1502 in the gas collecting cavity 1505 are used for separating engine oil in a small amount of sucked oil gas to flow out. The gas collection chamber 1505 ensures the pressure difference between the air inlet valve and the air outlet valve and the helium detection pipeline, and simultaneously performs gas-oil separation in the chamber, so as to filter the collected gas and ensure the smoothness of the helium detection pipeline.

As shown in fig. 6, the engine oil consumption measuring device of the engine includes a cylinder cover adapting device 1, a helium tank 2, an air intake side helium detection pipeline 3, an exhaust camshaft driving motor 4, an air intake camshaft driving motor 5, a helium air intake pipe 6, a helium ventilation cover 7, an exhaust side pipeline fixing device 9, an air intake pipeline fixing device, an exhaust side helium detection pipeline 10, a workbench 12, a control panel 13, a helium mass spectrometer leak detection unit 14, and a gas collecting device 15.

Helium gas vent cover 7: the helium gas inlet pipe is used for sealing an engine oil port cover of the engine, is communicated with the helium gas inlet pipe 6, and leads helium gas (detection medium) in the helium gas bottle 2 into a cylinder cover 8 to be detected.

Intake duct fixing means (not shown in fig. 1, the following exhaust side adaptor 9 may be referred to): the helium detection device is used for being matched with an air inlet face of an exhaust end of an engine, screwing down after assembly and fixing the helium detection pipeline 3 at the air inlet side.

Exhaust duct fixing device 9: the device is used for being matched with an air inlet end and an air outlet surface of an engine, and is screwed down after being assembled to fix the helium gas detection pipeline 10 on the air outlet side.

Air inlet side helium gas detection pipeline 3: and the helium gas mixture used for collecting the leaked helium gas by the gas inlet and collection device 15 is introduced into the helium mass spectrometer leak detection unit 14 by negative pressure suction.

Exhaust side helium gas detection line 9: and the helium mixed gas used for collecting the leaked helium gas collected by the exhaust gas collection device 15 is introduced into the helium mass spectrometer leak detection unit 14 through negative pressure suction.

The working table 12: the device is used for integrally installing all the sub-device parts of the measuring device.

The control panel 13: the control system controls the operation and data display of all electrical elements on the measuring equipment and is provided with an interface for data output externally.

A microcomputer control system: data and programs are input into a computer through input equipment, the computer controls a servo motor of an air inlet driving motor to exhaust and drive the servo motor of the motor, a driving shaft and a coupling according to a control decision so that the rotating speed of a cam shaft reaches a rotating speed area of 0-3000 RPM, a detection medium helium enters a cylinder cover through a helium air inlet pipe and a helium vent cover, and the inflation pressure is greater than 1 bar. The independently designed gas collecting device 15 collects helium leaked from between the valve oil seal sealing lip and the valve, and meanwhile, the computer controls the helium mass spectrum leakage detecting unit to suck the collected helium mixed gas into the gas collecting device through negative pressure for detection.

Intake camshaft drive motor 5: the device is used for driving the intake camshaft to reach the rotating speed required by measurement.

Exhaust camshaft drive motor 4: the device is used for driving the exhaust camshaft to reach the rotating speed required by measurement.

Helium gas inlet pipe 6: the helium tank 2 is connected with a helium gas vent cover, so that helium gas is introduced into the cylinder cover 8.

A lubrication unit: the engine oil is stored in a hollow cavity at the lower layer of the cylinder cover adapter, the engine oil in the cavity is pumped into an oil passage in the cylinder cover adapter through the engine oil pump 11, the engine oil enters the cylinder cover to lubricate a camshaft, a ball rocker, an air valve and the like, and the lubricated engine oil flows into an oil return passage in the cylinder cover adapter 1 through an oil return passage in the cylinder cover 8 and finally returns to the cavity to form a loop; as shown in fig. 3, the oil pump 11 can collect the lubricant flowing back from the oil return channel and guide it back to the lubricant tank, so as to ensure the normal operation of the valve train.

The device simulates the working condition of an engine (non-ignition) when the rack operates; the microcomputer control system inputs data and programs into a computer through input equipment, and the computer controls the oil temperature of the engine oil of the cylinder cover adapter device 1 (a built-in temperature control box) to be heated to a temperature region of 90 ℃ according to control decisions. And controlling an air inlet camshaft driving motor 5 and an air outlet camshaft driving motor 4 to rotate, driving the camshaft to rotate to a rotating speed area of 0-3000 RPM through a driving shaft or a coupling, enabling medium helium used for storage and measurement to enter a cylinder cover 8 through a helium inlet pipe 6 and a helium vent cover 7 by a helium bottle 2, and enabling inflation pressure to be larger than 1 bar. The gas collection device 15 collects helium leaked between a sealing lip of an air valve oil seal and an air valve, the collected helium enters the helium mass spectrum leakage detection unit 14 through the helium detection pipeline 3 at the air inlet side and the helium detection pipeline 10 at the air outlet side by 1.10 ^ 7 millibar/liter/second (low flow) and 1.10 ^ 6 millibar/liter/second (high flow) respectively through negative pressure, the collected helium molecules enter the helium mass spectrum leakage detection unit 14 through negative pressure, and the helium mass spectrum leakage detection unit 14 performs leakage quantity test quickly. The device has the advantages of high detection precision of 1.0E-7mbar L/s, short test time, realization of static/dynamic test, and realization of optimal design and rapid detection of batch products (valve oil seals).

The engine oil consumption measuring device can simulate the leakage rate of helium molecules from the valve oil seal under various working conditions when an engine (not ignited) runs on a rack, and finally judges the engine oil consumption through statistical analysis. The measuring device comprises a lubricating oil pump, a temperature control device, a cylinder cover adapter device, two servo motors, a helium tank (medium), a microcomputer control system, a valve oil seal gas collecting device, an air inlet surface integrated pipeline, an air outlet surface integrated pipeline, a helium mass spectrum leak detection unit and the like; the device has the advantages that the rotating speed of the camshaft is controlled to be 0-3000 RPM through the servo motor, when the oil temperature of engine oil is heated to 90 ℃ (determined according to different engine experiment requirements), a certain amount of helium detection medium is filled into a cylinder cover and a cylinder cover shell through a helium bottle, helium molecules leaked from an air inlet valve oil seal and an air outlet valve oil seal are collected through the independently designed gas collecting device, the collected helium molecules enter a helium mass spectrum leakage detecting unit through negative pressure, the leakage rate is obtained, the detection precision of the device can reach 1.0E-7mbar L/s, the test time is short, static (camshaft and valve static)/dynamic (simulating engine non-ignition operation) test can be realized, the oil consumption of the internal combustion engine under transient working conditions can be measured, and the rapid detection of the valve oil seals in batch production of engine manufacturers and valve oil seals can be realized.

The device effectively improves the measuring method of the engine oil consumption, overcomes the defect that the existing equipment for measuring the engine oil consumption can only detect the whole machine and can not detect single parts, improves the measuring precision, reduces the detecting cost and the maintenance rate, and improves the quality and the performance of the engine.

The foregoing is only illustrative of the embodiments of the present invention and application of the technical principles. The present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described by the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and is not limited to the embodiments.