CN104634577A - Exhaust valve testing device for high-power marine diesel engine - Google Patents
Exhaust valve testing device for high-power marine diesel engine Download PDFInfo
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- CN104634577A CN104634577A CN201510054156.2A CN201510054156A CN104634577A CN 104634577 A CN104634577 A CN 104634577A CN 201510054156 A CN201510054156 A CN 201510054156A CN 104634577 A CN104634577 A CN 104634577A
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Abstract
The invention aims at providing an exhaust valve testing device for a high-power marine diesel engine. The exhaust valve testing device comprises an exhaust valve part, a cylinder part, a hydraulic part, an air supply system and a pressure temperature adjusting system, wherein the exhaust valve part comprises an upper exhaust valve body, a lower exhaust valve body, an exhaust valve rod, an exhaust valve motion piston, an exhaust valve rod pressing body and a pressing body compression spring; the cylinder part comprises a cylinder body; the hydraulic part comprises a servo oil tank, a servo oil pump and an exhaust control unit body; the air supply system comprises an air bottle; the pressure temperature adjusting system comprises a nitrogen bottle. According to the exhaust valve testing device, the real working condition in a cylinder when an exhaust valve is opened can be simulated by adjusting and setting the temperature and the pressure in the cylinder body; optimal control on the intake and exhaust processes of a marine low-speed diesel engine is facilitated; the exhaust valve testing device has a significant effect on improvement of the fuel economy of the diesel engine and reduction of hazardous emission.
Description
Technical field
What the present invention relates to is a kind of test unit, specifically diesel engine testing device.
Background technology
Vent valve and control system thereof are the important component parts of high-power marine two-stroke low speed diesel engine, open by controlling vent valve air inlet, the exhaust process that moment and close moment realize diesel engine, thus realize the good fuel consumption and emission of diesel engine.The RT-Flex series and ME series low-speed machine of Wa Xilan and graceful benefactor department all use hydraulically powered exhaust valve mechanism, VCU (Valve Control Unit) is utilized to control, from servo oil in servo oil common rail, to realize the opening and closing to vent valve.
Patent CN 103953427A, CN10395341A describe electric liquid and drives exhaust gear and driving pressure variable boost formula exhaust gear, by the first stage piston on one-level supercharger and second piston, supercharging is carried out to the hydraulic oil in elementary booster cavity, thus realize driving with different boost pressures in exhaust valve opening and maintenance process and maintaining, be conducive to reducing the charge oil pressure driving hydraulic oil.Domestic patent in exhaust structure is quite a lot, but the patent in vent valve test unit also rarely has and runs into.
Summary of the invention
The object of the present invention is to provide and can open a kind of large-power marine diesel engines vent valve test unit of condition of work in moment real cylinder by simulated exhaust valve.
The object of the present invention is achieved like this:
A kind of large-power marine diesel engines vent valve of the present invention test unit, is characterized in that: comprise vent valve part, cylinder portion, hydraulic part, air supply system, pressure and temp regulating system, vent valve part comprises vent valve upper body, vent valve lower body, exhasut valve stem, vent valve moving piston, exhasut valve stem fastening body, fastening body holddown spring, vent valve upper body is arranged on vent valve lower body, in vent valve upper body and vent valve lower body, the cavity be interconnected is set, exhasut valve stem is arranged in the cavity of vent valve upper body and vent valve lower body, vent valve moving piston is set between exhasut valve stem top and vent valve upper body, on exhasut valve stem, cover has intermediate mass successively from top to bottom, fastening body holddown spring, exhasut valve stem fastening body, exhasut valve stem fastening body is fixedly connected with vent valve lower body with vent valve upper body respectively, fastening body holddown spring is pressed on exhasut valve stem fastening body, intermediate mass, exhasut valve stem fastening body and vent valve upper body inwall form air spring chamber, cylinder portion comprises cylinder block, and cylinder block is arranged on below vent valve lower body, and cylinder block is communicated with the cavity of vent valve lower body by the vent valve valve seat of exhasut valve stem end or is cut off, and cylinder block lining puts temperature sensor and pressure transducer, hydraulic part comprises servo fuel tank, servo oil pump, exhaust gas control unit body, servo fuel tank is communicated with servo oil rail by low pressure servo oil inlet pipe, servo oil pump installed by low pressure servo oil inlet pipe, servo oil rail is communicated with servo fuel tank by servo oil scavenge pipe, one end of exhaust gas control unit body is communicated with by two-position three way magnetic valve with servo oil rail or disconnects, and the other end is connected with the oil pocket on vent valve moving piston by high pressure servo oil oil inlet pipe, air supply system comprises air bottle, and air bottle is communicated with air spring chamber by air intake duct, air intake duct is installed the first pressure-regulating valve, pressure and temp regulating system comprises nitrogen cylinder, and nitrogen cylinder is communicated with cylinder block by nitrogen inlet duct, nitrogen inlet duct is installed the second pressure-regulating valve, cylinder block inwall is arranged the resistive heater connecting temperature switch board.
The present invention can also comprise:
1, cylinder block installs back pressure regulating valve, retaining valve installed by low pressure servo oil oil inlet pipe, rail pressure variable valve installed by servo oil scavenge pipe.
Advantage of the present invention is: 1, a kind of marine low speed diesel engine vent valve test unit of the present invention can for high-power marine low-speed diesel engine join machine vent valve improves, Novel vent valve structural design provides Trial Verification Installation; 2, this vent valve testing table is by regulating the temperature and pressure in vent valve cylinder block and setting, and allows to carry out vent valve and opens the experimental study of temperature and pressures different in moment cylinder block to exhaust valve opening characteristic and closing property; 3, utilize the test figure of this vent valve testing table, can carry out checking and verify to exhaust valve operation process simulation model, being conducive to the later stage carries out the research of vent valve simulation calculation, and exploration exhaust structure parameter is to the affecting laws of exhaust valve operation response characteristic; 4, based on this vent valve testing table, can study the control strategy of vent valve control system, the rational exhaust valve operation stroke of optimization, vent valve open the moment, be conducive to being optimized research to marine low speed diesel engine inlet and outlet process, and then improve the fuel economy of diesel engine and reduce the discharge of nuisance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing citing, the present invention is described in more detail:
Composition graphs 1, a kind of large-power marine diesel engines vent valve test unit of the present invention is made up of vent valve part A, cylinder portion B, hydraulic part C, air supply system D, pressure and temperature regulating system E.
Vent valve part A comprises vent valve upper body 1, exhasut valve stem 2, vent valve moving piston 3, intermediate mass 4, exhasut valve stem fastening body 5, fastening body holddown spring 6, air spring chamber 7, vent valve lower body 8, vent valve valve seat 9, displacement transducer 10 forms, it is characterized in that, exhasut valve stem 2 is positioned at vent valve upper body 1, vent valve upper body is inserted in vent valve lower body 8, vent valve moving piston 3 is positioned at vent valve upper body 1, be used for driving the motion of exhasut valve stem 2, intermediate mass 4 is positioned at vent valve upper body 1, be enclosed within exhasut valve stem 2, gap between this intermediate mass 4 and vent valve upper body 1 is only several micron, for exact contact, exhasut valve stem fastening body 5 is an annular solid, be enclosed within exhasut valve stem 2, with vent valve upper body 1, vent valve lower body 8 is fixedly connected with, prevent the fuel oil in cylinder from entering in vent valve upper body 1 by the gap between exhasut valve stem 2 and vent valve lower body 8, fastening body holddown spring 6 is butterfly spring, be positioned at above vent valve fastening body 5, be used for compressing exhasut valve stem fastening body 5, prevent vent valve fastening body 5 in the axially motion of vent valve lower body 8, intermediate mass 4, air spring chamber 7 is defined between exhasut valve stem fastening body 5 and vent valve upper body 1, when the air spring that formed ensures that exhasut valve stem 2 vent valve merit does not work and vent valve valve seat 9 fit tightly, the cavity formed between exhasut valve stem 2 and vent valve lower body 9 is flowed back to prevent the high-temperature high-pressure fuel gas in cylinder, it is inner that displacement transducer 10 is positioned at vent valve upper body, install perpendicular to air discharging valve bar 2, be used for measuring the displacement of air discharging valve bar.
Cylinder portion B comprises cylinder block 11, zone of heating 12, temperature sensor 13, pressure transducer 14, back pressure regulating valve 15, it is characterized in that, cylinder block is cylindrical thicl-walled cylinder, below vent valve lower body 8, fit tightly with vent valve lower body 8, ensure air tight, zone of heating 12 is furnished with at the inside surface of cylinder block 11, zone of heating 12 is formed by the inside surface organizing resistive heater more and be wrapped in cylinder block 11, the gas be used in heat air cylinder body 11, the diverse location of cylinder block 11 is furnished with multiple temperature sensor 13 and pressure transducer 14, be used for monitoring the temperature and pressure of diverse location gas in cylinder block 11, vent valve correlation test is carried out after pressure and temperature in guarantee cylinder block 11 is uniformly distributed, back pressure regulating valve 15 is Manual pressure variable valve, by the gaseous tension be used in adjusting cylinders body 11, ensure that gaseous tension is in setting range.
Hydraulic part C comprises servo fuel tank 16, servo oil strainer 17, servo oil pump 18, retaining valve 19, low pressure servo oil oil inlet pipe 20, servo oil rail 21, rail pressure sensor 22, rail pressure variable valve 23, servo oil scavenge pipe 24, exhaust gas control unit body 25, high pressure servo oil oil inlet pipe 26, it is characterized in that, servo oil strainer 17 is positioned at servo fuel tank 16, be used for filtering to servo oil, be servo oil pump 18 above servo oil strainer 17, be retaining valve 19 above servo oil pump 18, retaining valve 19 is connected with servo oil rail 21 by low pressure servo oil oil inlet pipe 20, servo oil rail 21 is the cylindrical oil vessel of pair of lamina heavy wall, rail pressure sensor 22 is positioned at above servo oil rail 21, be used for detecting the oil pressure of servo oil in servo oil rail, rail pressure variable valve 23 is electric control solenoid valve, this valve is by regulating the oil pressure of servo oil in servo oil rail 21 to the form of servo oil scavenge pipe 24 overflow, meet the requirement of the driving oil pressure required for outlet valve system, exhaust gas control unit body 25 is the cell cube with automatically controlled two-position three way magnetic valve, one end of exhaust gas control unit body 25 is communicated with by two-position three way magnetic valve with servo oil rail 21 or disconnects, the other end is communicated with high pressure servo oil oil inlet pipe 26, exhaust gas control unit body 25 is connected with the oil pocket on the vent valve moving piston 3 of vent valve upper body 1 by high pressure servo oil oil inlet pipe 26.
Air supply system D comprises air bottle 27, pressure-regulating valve 28, tensimeter 29, air intake duct 30, it is characterized in that, high pressure air is filled with in air bottle 27, pressure-regulating valve 28 comprises one-level pressure relief valve and second voltage regulation valve, be used for carrying out second depressurized output to high pressure air, tensimeter 29 is precision pressure gauge, is used for reading the charge pressure after second depressurized, and post-decompression pressurized air is entered into by air intake duct 30 in the air spring chamber 7 in vent valve upper body 1.
Pressure and temperature regulating system E comprises nitrogen cylinder 31, pressure-regulating valve 32, tensimeter 33, nitrogen inlet duct 34, the zone of heating 12 of resistive heater composition, pressure transducer 14, temperature sensor 13, temperature switch board 35, gather and control module 36, it is characterized in that, nitrogen cylinder 31 is built with high-pressure liquid nitrogen, pressure-regulating valve 32 is electric controlled regulating valve, be used for the adjustment of the nitrogen pressure carrying out second depressurized, tensimeter 33 is precision pressure gauge, be used for detecting post-decompression nitrogen pressure to the charge pressure in cylinder block 11, zone of heating 12 forms by organizing resistive heater more, be arranged in the inside surface of cylinder block, the heat that adds of resistive heater carries out temperature setup control by temperature switch board 35, temperature switch board 35 is provided with temperature from constant heating function, after temperature reaches setting value, automatic start-up temperature is from constant heating function, fine setting is carried out to temperature and ensures that cylinder temperature is all the time within the scope of design temperature, the each point temperature in cylinder block 11 is obtained by being arranged in multiple temperature sensors 13 of diverse location in cylinder block 11, to gather and control module 36 temperature sensor 13 and pressure transducer 14 to obtain in cylinder temperature and pressure in 11, according to the required temperature and pressure reached, temperature switch board 35 and electrohydraulic pressure control variable valve 32 are controlled in real time.
Specific works principle of the present invention is as follows: before being exhausted valve test, regulate the sort of air pressure adjusting valve 28 of air supply system, adjustment enters into the air pressure in vent valve air spring chamber 7 by air intake duct 30, by precision pressure gauge 29, the pressure of air after reading second depressurized, ensures that the vent valve valve seat 9 on exhasut valve stem 2 and vent valve lower body 8 fits tightly.According to the requirement of vent valve testing experiment, calculate the pressure and temperature opened at vent valve in moment cylinder block 11, pressure and temperature regulating system E is utilized to carry out setting and the adjustment of pressure and temperature in cylinder block 11, first, carry out the adjustment of pressure in cylinder block 11, regulate the pressure-regulating valve 32 on nitrogen cylinder 31, observe the admission pressure of display on tensimeter 33, and by pressure everywhere in pressure transducer 14 moment of being arranged in diverse location in cylinder block 11 monitoring cylinder, after the pressure of simulation in cylinder block 11 reaches setting value, close the pressure-regulating valve 32 on nitrogen cylinder 31, start to carry out temperature adjustment.The temperature of the required heating of setting on temperature switch board 35, and start-up temperature is from constant function, the gas be evenly arranged in zone of heating 12 pairs of cylinders of the resistive heater composition of cylinder block 11 inside surface heats, in heating process, cylinder temperature measurement is carried out by the temperature sensor 13 be arranged in cylinder block 11, after in cylinder, heating-up temperature reaches set point of temperature, temperature is opened from constant function, ensure that in cylinder block 11, gas temperature fluctuates within the scope of set point of temperature, meets the requirement of test condition.After cylinder temperature reaches the temperature and pressure of setting, and temperature and pressure variable quantity in 1-2 hour is no more than 5%, now starts to be exhausted valve test.Low pressure servo oil is under the effect of servo oil pump 18, be pumped out from servo fuel tank 16, enter in servo oil rail 21 by servo oil strainer 17, retaining valve 19, low pressure servo oil oil inlet pipe 20, the rail pressure sensor 22 be arranged on servo oil rail 21 detects the servo oil pressure in servo oil rail 21, when needing to change the oil pressure in servo oil rail 21, cut-in pressure variable valve 23, adopts the regulative mode realization of the servo oil part in servo oil rail 21 being let out back servo fuel tank 16 by servo oil scavenge pipe 24 to the adjustment of servo oil pressure in servo oil rail 21.When exhaust gas control unit body 25 does not work, high pressure servo oil is cut off from servo oil rail 21 to the circulation of high pressure servo oil oil inlet pipe 26, and the oily epicoele that can not enter into vent valve moving piston 3 of high pressure servo is exhausted the driving of valve.After exhaust gas control unit body 25 receives the command signal sent from control system, exhaust gas control unit body 25 obtains electric work, exhaust gas control unit body 25 is communicated with high pressure oil inlet pipe 26 and servo oil rail 21, high pressure servo oil enters on vent valve moving piston 3 by servo oil oil inlet pipe 26, when the downward acting force that vent valve moving piston 3 produces is greater than the acting force that air in air spring chamber 7 produces upwards, exhasut valve stem 2 moves downward, and realizes opening of vent valve.When after exhaust gas control unit body 25 power-off, high pressure servo oil oil inlet pipe 26 is connected with servo oil oil return circuit, and disconnect mutually with servo oil rail 21, high pressure servo oil releases in vent valve upper body 1, when the upwards acting force that air in air spring chamber 7 produces is greater than the downward acting force of servo oil generation on vent valve moving piston 3, vent valve moves upward, until the delivery valve seat 9 on exhasut valve stem 2 and vent valve lower body 8 contacts, exhaust process terminates.In exhasut valve stem 2 motion process, measured the characteristics of motion of exhasut valve stem by the displacement transducer 10 be arranged on vent valve upper body 1.
Vent valve part comprises vent valve upper body, exhasut valve stem, vent valve moving piston, intermediate mass, exhasut valve stem fastening body, fastening body holddown spring, air spring chamber, vent valve lower body, vent valve valve seat, displacement transducer, exhasut valve stem is positioned at vent valve upper body, vent valve upper body is inserted in vent valve lower body, vent valve moving piston is positioned at vent valve upper body, be used for driving the motion of exhasut valve stem, intermediate mass is positioned at vent valve upper body, be enclosed within exhasut valve stem, exhasut valve stem fastening body is an annular solid, be enclosed within exhasut valve stem, with vent valve upper body, vent valve lower body is fixedly connected with, fastening body holddown spring is butterfly spring, be positioned at above vent valve fastening body, be used for compressing exhasut valve stem fastening body, intermediate mass, air spring chamber is defined between exhasut valve stem fastening body and vent valve upper body, it is inner that displacement transducer is positioned at vent valve upper body, install perpendicular to air discharging valve bar.
Cylinder portion comprises cylinder block, zone of heating, temperature sensor, pressure transducer, back pressure regulating valve, cylinder block is cylindrical thick-walled vessel, be positioned at below vent valve lower body, fit tightly with vent valve lower body, zone of heating is equipped with at the outer surface cloth of cylinder block, zone of heating is formed by the surface organizing resistive heater more and be wrapped in cylinder block, the diverse location of cylinder block is furnished with multiple temperature sensor and pressure transducer, be used for monitoring the temperature and pressure of diverse location gas in cylinder block, back pressure regulating valve is Manual pressure variable valve, the gaseous tension be used in adjusting cylinders body.
Hydraulic part comprises servo fuel tank, servo oil strainer, servo oil pump, retaining valve, servo oil oil inlet pipe, servo oil rail, rail pressure sensor, rail pressure variable valve, servo oil scavenge pipe, exhaust gas control unit body, high pressure servo oil oil inlet pipe, servo oil strainer is positioned at servo fuel tank, be used for filtering to servo oil, be servo oil pump above servo oil strainer, be retaining valve above servo oil pump, retaining valve is connected with servo oil rail by low pressure servo oil oil inlet pipe, servo oil rail is the cylindrical oil vessel of pair of lamina heavy wall, rail pressure sensor is positioned at above servo oil rail, rail pressure variable valve is electric control solenoid valve, exhaust gas control unit body is the cell cube with automatically controlled two-position three way magnetic valve, realize being communicated with or disconnection of high pressure servo oil oil inlet pipe and servo oil rail.
Air supply system comprises air bottle, pressure-regulating valve, tensimeter, air intake duct, high pressure air is filled with in air bottle, pressure-regulating valve comprises one-level pressure relief valve and second voltage regulation valve, be used for carrying out second depressurized output to high pressure air, tensimeter is precision pressure gauge, is used for reading the charge pressure after second depressurized.
Pressure and temperature regulating system comprises nitrogen cylinder, pressure-regulating valve, tensimeter, nitrogen inlet duct, the zone of heating of resistive heater composition, pressure transducer, temperature sensor, temperature switch board, gather and control module, nitrogen cylinder is built with high-pressure liquid nitrogen, pressure-regulating valve is electric controlled regulating valve, tensimeter is precision pressure gauge, be used for detecting post-decompression nitrogen pressure to the charge pressure in cylinder block, zone of heating forms by organizing resistive heater more, be arranged in the inside surface of cylinder block, the heat that adds of resistive heater carries out temperature setup control by temperature switch board, temperature switch board is provided with temperature from constant heating function.
For precision pair coordinates between intermediate mass and vent valve upper body, ensure that intermediate mass both can be free to slide along vent valve upper body inner surface axial, avoid again the leakage of the air in air spring chamber.
Zone of heating on block surface is made up of resistive heater, and this zone of heating is wrapped in the outside surface of cylinder block, is coated with one deck thermal insulating filler outside zone of heating, diffuses in air in order to prevent heat.
Can be nitrogen or other inert gases in nitrogen cylinder in temperature and pressure system.
The present invention includes vent valve part, cylinder portion, hydraulic part, air supply system, pressure and temperature regulating system, vent valve part comprises vent valve upper body, exhasut valve stem, vent valve moving piston, intermediate mass, exhasut valve stem fastening body, fastening body holddown spring, air spring chamber, vent valve lower body, vent valve valve seat, displacement transducer, exhasut valve stem is positioned at vent valve upper body, vent valve upper body is inserted in vent valve lower body, vent valve moving piston is positioned at vent valve upper body, be used for driving the motion of exhasut valve stem, intermediate mass is positioned at vent valve upper body, be enclosed within exhasut valve stem, exhasut valve stem fastening body is an annular solid, be enclosed within exhasut valve stem, with vent valve upper body, vent valve lower body is fixedly connected with, fastening body holddown spring is butterfly spring, be positioned at above vent valve fastening body, be used for compressing exhasut valve stem fastening body, it is inner that displacement transducer is positioned at vent valve upper body, install perpendicular to air discharging valve bar.Cylinder portion comprises cylinder block, zone of heating, temperature sensor, pressure transducer, back pressure regulating valve, cylinder block is cylindrical thicl-walled cylinder, below vent valve lower body, fit tightly with vent valve lower body, zone of heating is equipped with at the outer surface cloth of cylinder block, zone of heating is formed by the surface organizing resistive heater more and be wrapped in cylinder block, the diverse location of cylinder block is furnished with multiple temperature sensor and pressure transducer, be used for monitoring the temperature and pressure of diverse location gas in cylinder block, back pressure regulating valve is Manual pressure variable valve, the gaseous tension be used in adjusting cylinders body.Hydraulic part comprises servo fuel tank, servo oil strainer, servo oil pump, retaining valve, low pressure servo oil oil inlet pipe, servo oil rail, rail pressure sensor, rail pressure variable valve, servo oil scavenge pipe, exhaust gas control unit body, high pressure servo oil oil inlet pipe, servo oil strainer is positioned at servo fuel tank, be used for filtering to servo oil, retaining valve is connected with servo oil rail by low pressure servo oil oil inlet pipe, servo oil rail is the cylindrical oil vessel of pair of lamina heavy wall, rail pressure sensor is positioned at above servo oil rail, rail pressure variable valve is electric control solenoid valve, exhaust gas control unit body is the cell cube with automatically controlled two-position three way magnetic valve, realize being communicated with or disconnection of high pressure servo oil oil inlet pipe and servo oil rail.Air supply system comprises air bottle, pressure-regulating valve, tensimeter, air intake duct, high pressure air is filled with in air bottle, pressure-regulating valve comprises one-level pressure relief valve and second voltage regulation valve, be used for carrying out second depressurized output to high pressure air, tensimeter is precision pressure gauge, is used for reading the charge pressure after second depressurized.Pressure and temperature regulating system comprises nitrogen cylinder, pressure-regulating valve, tensimeter, nitrogen inlet duct, the zone of heating of resistive heater composition, pressure transducer, temperature sensor, temperature switch board, gather and control module, nitrogen cylinder is built with high-pressure liquid nitrogen, pressure-regulating valve is electric controlled regulating valve, tensimeter is precision pressure gauge, be used for detecting post-decompression nitrogen pressure to the charge pressure in cylinder block, zone of heating forms by organizing resistive heater more, be arranged in the inside surface of cylinder block, the heat that adds of resistive heater carries out temperature setup control by temperature switch board.
For precision pair coordinates between intermediate mass and vent valve upper body, ensure that intermediate mass both can be free to slide along vent valve upper body inner surface axial, avoid again the leakage of the air in air spring chamber.
Zone of heating on block surface is made up of resistive heater, and this zone of heating is wrapped in the outside surface of cylinder block, is coated with one deck thermal insulating filler outside zone of heating, diffuses in air in order to prevent heat.
Can be nitrogen or other inert gases in nitrogen cylinder in temperature and pressure system.
Claims (2)
1. a large-power marine diesel engines vent valve test unit, is characterized in that: comprise vent valve part, cylinder portion, hydraulic part, air supply system, pressure and temp regulating system, vent valve part comprises vent valve upper body, vent valve lower body, exhasut valve stem, vent valve moving piston, exhasut valve stem fastening body, fastening body holddown spring, vent valve upper body is arranged on vent valve lower body, in vent valve upper body and vent valve lower body, the cavity be interconnected is set, exhasut valve stem is arranged in the cavity of vent valve upper body and vent valve lower body, vent valve moving piston is set between exhasut valve stem top and vent valve upper body, on exhasut valve stem, cover has intermediate mass successively from top to bottom, fastening body holddown spring, exhasut valve stem fastening body, exhasut valve stem fastening body is fixedly connected with vent valve lower body with vent valve upper body respectively, fastening body holddown spring is pressed on exhasut valve stem fastening body, intermediate mass, exhasut valve stem fastening body and vent valve upper body inwall form air spring chamber, cylinder portion comprises cylinder block, and cylinder block is arranged on below vent valve lower body, and cylinder block is communicated with the cavity of vent valve lower body by the vent valve valve seat of exhasut valve stem end or is cut off, and cylinder block lining puts temperature sensor and pressure transducer, hydraulic part comprises servo fuel tank, servo oil pump, exhaust gas control unit body, servo fuel tank is communicated with servo oil rail by low pressure servo oil inlet pipe, servo oil pump installed by low pressure servo oil inlet pipe, servo oil rail is communicated with servo fuel tank by servo oil scavenge pipe, one end of exhaust gas control unit body is communicated with by two-position three way magnetic valve with servo oil rail or disconnects, and the other end is connected with the oil pocket on vent valve moving piston by high pressure servo oil oil inlet pipe, air supply system comprises air bottle, and air bottle is communicated with air spring chamber by air intake duct, air intake duct is installed the first pressure-regulating valve, pressure and temp regulating system comprises nitrogen cylinder, and nitrogen cylinder is communicated with cylinder block by nitrogen inlet duct, nitrogen inlet duct is installed the second pressure-regulating valve, cylinder block inwall is arranged the resistive heater connecting temperature switch board.
2. a kind of large-power marine diesel engines vent valve test unit according to claim 1, is characterized in that: cylinder block installs back pressure regulating valve, and retaining valve installed by low pressure servo oil oil inlet pipe, and rail pressure variable valve installed by servo oil scavenge pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510054156.2A CN104634577A (en) | 2015-01-30 | 2015-01-30 | Exhaust valve testing device for high-power marine diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510054156.2A CN104634577A (en) | 2015-01-30 | 2015-01-30 | Exhaust valve testing device for high-power marine diesel engine |
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| CN104634577A true CN104634577A (en) | 2015-05-20 |
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| CN201510054156.2A Pending CN104634577A (en) | 2015-01-30 | 2015-01-30 | Exhaust valve testing device for high-power marine diesel engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113944581A (en) * | 2021-11-11 | 2022-01-18 | 重庆红江机械有限责任公司 | Low-speed machine high-pressure oil pump test system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113944581A (en) * | 2021-11-11 | 2022-01-18 | 重庆红江机械有限责任公司 | Low-speed machine high-pressure oil pump test system |
| CN113944581B (en) * | 2021-11-11 | 2023-06-30 | 重庆红江机械有限责任公司 | Low-speed machine high-pressure oil pump test system |
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Application publication date: 20150520 |