CN108019281B - Lubricating oil system of miniature gas turbine - Google Patents
Lubricating oil system of miniature gas turbine Download PDFInfo
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- CN108019281B CN108019281B CN201711427832.1A CN201711427832A CN108019281B CN 108019281 B CN108019281 B CN 108019281B CN 201711427832 A CN201711427832 A CN 201711427832A CN 108019281 B CN108019281 B CN 108019281B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/06—Arrangements of bearings; Lubricating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0402—Cleaning of lubricants, e.g. filters or magnets
- F16H57/0404—Lubricant filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
- F16H57/0435—Pressure control for supplying lubricant; Circuits or valves therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0434—Features relating to lubrication or cooling or heating relating to lubrication supply, e.g. pumps ; Pressure control
- F16H57/0436—Pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/045—Lubricant storage reservoirs, e.g. reservoirs in addition to a gear sump for collecting lubricant in the upper part of a gear case
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0456—Lubrication by injection; Injection nozzles or tubes therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0458—Oil-mist or spray lubrication; Means to reduce foam formation
- F16H57/046—Oil-mist or spray lubrication
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0467—Elements of gearings to be lubricated, cooled or heated
- F16H57/0469—Bearings or seals
- F16H57/0471—Bearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0467—Elements of gearings to be lubricated, cooled or heated
- F16H57/0475—Engine and gearing, i.e. joint lubrication or cooling or heating thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0467—Elements of gearings to be lubricated, cooled or heated
- F16H57/0479—Gears or bearings on planet carriers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/048—Type of gearings to be lubricated, cooled or heated
- F16H57/0482—Gearings with gears having orbital motion
- F16H57/0486—Gearings with gears having orbital motion with fixed gear ratio
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Details Of Gearings (AREA)
Abstract
The invention discloses an oil system of a miniature gas turbine, which is used for providing clean oil with specified pressure and proper temperature for various friction pairs such as a shaft, a gear, a bearing, a sun gear assembly, an output driving gear and the like and a rotor shaft bearing in a planetary reduction transmission mechanism arranged in a reduction transmission case, wherein the oil system has the characteristic of high integration, and an oil tank is positioned below the reduction transmission case, is integrally cast with the reduction transmission case and has a compact structure; the lubricating oil pump is a single-stage oil pump, is internally provided with a reduction gear box and is directly driven by an internal gear shaft, and the lubricating oil inlet and outlet are all internal oil paths; the system oil return is gravity oil return, and lubricating oil for lubricating gears, bearings and the like is deposited to the bottom of the speed reducer casing and returns to the lubricating oil tank through the oil hole; the lubricating oil filter shell and the reducer casing are integrally designed, and oil inlet and outlet of the filter element are all in an internal oil way.
Description
Technical Field
The invention relates to the technical field of gas turbines, in particular to an oil system of a miniature gas turbine.
Background
The miniature gas turbine is a newly developed miniature heat engine, the single machine power range of which is 25-300 kW, and the miniature gas turbine mainly comprises a gas compressor, a combustion chamber, a turbine, a speed reducer, a fuel system, a lubricating oil system and the like. The miniature gas turbine generator set has a series of advantages of high efficiency, low noise, low pollution, small weight, small volume, multiple integrated capacity expansion and the like, and has important roles and strategic significance in the fields of national economy such as electric power, power and the like, national security and the like.
During operation of a gas turbine or a generator set thereof, if good lubricating and cooling effects are not achieved, the power of the gas turbine and the service life of the gas turbine are affected. The gas turbine needs to supply lubricating oil on the working surfaces of the bearing, the gear and the like during normal operation, so that a continuous oil film can be formed, further friction damage between structures is reduced, heat transmitted by friction and high-temperature parts is taken away, the parts are maintained in a normal operating temperature range, and the service life of the parts is prolonged. Therefore, a stable and reliable lubricating oil system is important for the stable and reliable operation and the service life of the gas turbine.
Disclosure of Invention
In order to overcome the defects and shortcomings of the prior art, the invention provides the lubricating oil system of the miniature gas turbine, which mainly has the function of providing clean lubricating oil with specified pressure and proper temperature for each friction pair of the gas turbine, lubricating a shaft, a gear, a bearing, a sun gear assembly and an output driving gear in a speed reduction transmission device by the lubricating oil system, and simultaneously lubricating a rotor shaft bearing.
The invention adopts the technical proposal for solving the technical problems that:
an oil system of miniature gas turbine is used for providing clean oil with regulated pressure and proper temperature for various friction pairs in planetary speed-reducing transmission mechanism in speed-reducing transmission case, said planetary speed-reducing transmission mechanism includes at least one high-speed sun gear and several planetary gears on planetary gear frame, the high-speed sun gear is mounted on the front end of a hollow rotor shaft, and is characterized by that,
the lubricating oil system comprises a lubricating oil tank, a lubricating oil pump, a lubricating oil filter, an oil filter bypass valve, a system safety valve and a lubricating oil distribution ring which are arranged in the speed reduction transmission case,
the lubricating oil tank is arranged at the bottom of the speed reduction transmission case and is integrally formed with the speed reduction transmission case;
the bottom of the lubricating oil pump is provided with an oil inlet, the top of the lubricating oil pump is provided with an oil outlet, the oil inlet at the bottom of the lubricating oil pump is communicated with the lubricating oil tank through a pipeline, and the oil outlet at the top of the lubricating oil pump is communicated with the lubricating oil filter at the upper part of the lubricating oil pump through a lubricating oil channel arranged on the speed reduction transmission case;
the oil filter comprises a shell and a filter element arranged in the shell, wherein the shell of the oil filter is integrally formed with a speed reduction transmission case, the bottom of the shell is an oil inlet, the top of the shell is an oil outlet channel of a filter element cap, a side wall of the shell is provided with a bypass hole, the bypass hole is provided with an oil filter bypass valve, an outlet of the oil filter bypass valve is communicated with the oil outlet channel of the filter element cap at the top of the oil filter shell, and when the oil filter is normally operated, the oil filter bypass valve is closed and flows out of the shell from the oil outlet channel of the filter element cap at the top through the filter element, and when the filter element is blocked, the oil filter bypass valve is opened, and the oil bypasses the filter element and directly flows out of the oil filter element through the oil outlet channel of the filter element cap;
after the lubricating oil flows out from the lubricating oil filter, the lubricating oil sequentially enters a system safety valve and a lubricating oil distribution ring which are arranged on the planet gear carrier through a lubricating oil channel arranged on the speed reduction transmission case,
an axial oil spraying hole and a plurality of radial oil spraying holes are formed in the oil spraying ring, the radial oil spraying holes guide oil to be sprayed to a lubricating point where the high-speed sun gear is meshed with each planet gear, and bearings on other gears and gear shafts in the planetary reduction transmission mechanism are lubricated by oil mist stirred by the sun gear and the planet gears;
the hollow rotor shaft comprises a first channel and a second channel, the first channel is positioned in the center of the hollow rotor shaft and axially extends along the first channel, the second channel is positioned at the periphery of the first channel, an axial oil injection hole at the tail end of the oil distribution ring guides oil to be injected into a central hole of the high-speed sun gear, then the oil flows to the rear end of the hollow rotor shaft along the first channel of the hollow rotor shaft, an annular inner protruding table is arranged on the inner wall of the first channel, and part of oil mist is blown into a spline connection position of the hollow rotor shaft and the high-speed sun gear by utilizing centrifugal force; the rear end of the first channel is provided with a plurality of radial holes communicated with the second channel, the lubricating oil at the rear end of the first channel enters the second channel through the radial holes, then flows forwards along the second channel and returns to the roller bearing and the thrust bearing at the front end of the hollow rotor shaft, and the lubricating oil flows out of the oil retainer nut after passing through the thrust bearing and flows back to the lubricating oil tank under the action of gravity.
Preferably, the system safety valve is arranged on a bypass oil path of the outlet of the lubricating oil pump, when the oil pressure of the outlet of the lubricating oil pump is too high, part of lubricating oil leaks into the reduction gear box through the system safety valve and flows back to the lubricating oil tank under the action of gravity, and most of lubricating oil flows into the lubricating oil distributing ring.
Further, the system safety valve is a one-way valve and comprises a shell, a spring and a ball body arranged inside the planet gear carrier, wherein the spring and the ball body are used for keeping the shell of the system safety valve inside the planet gear carrier.
Preferably, the lubricating oil tank is cast integrally with the reduction gear box.
Further, an oil baffle plate integrally cast with the speed reduction transmission case is arranged between the oil tank and the speed reduction transmission mechanism, so that the oil in the oil tank is prevented from contacting with the rotating speed reduction transmission mechanism, and foam is avoided.
Further, a magnetic plug is arranged at the bottom of the lubricating oil tank, is installed on the lubricating oil tank through threads and is sealed by using a sealing ring, and the magnetic plug can adsorb metal scraps in the lubricating oil and is used for monitoring the abrasion condition of a friction pair.
Preferably, a knob type scale is installed on the reduction gear case and used for indicating the oil level in the lubricating oil tank, the knob type scale is fixed by using an integral rubber sealing gasket, and when the folding ring of the scale rotates clockwise, the sealing gasket is compressed and tightly attached to the end face of the scale.
Preferably, a low-pressure lubricating oil switch is arranged on the rear end face of the speed reduction transmission case, and when the oil pressure of the lubricating oil system is lower than 40kPa, the low-pressure lubricating oil switch forces the engine to stop.
Preferably, a centrifugal oil-gas separator is arranged at the top of the speed reduction transmission case, and sealing air from one side of the compressor roller bearing enters the transmission case and is mixed with oil mist in the case, oil-gas separation is carried out through the centrifugal oil-gas separator, and part of oil and gas which is not separated is discharged to the atmosphere from a ventilation channel to cause oil consumption.
Compared with the prior art, the lubricating oil system of the miniature gas turbine has the characteristics that the lubricating oil system lubricates a shaft, a gear, a bearing, a sun gear assembly and an output driving gear in the speed reduction transmission device, simultaneously lubricates a rotor shaft bearing, and has high integration, and a lubricating oil tank is positioned below a speed reducer casing, integrally cast with the casing and compact in structure; the lubricating oil pump is a single-stage oil pump, is internally provided with a reduction gear box and is directly driven by an internal gear shaft, and the lubricating oil inlet and outlet are all internal oil paths; the system oil return is gravity oil return, and lubricating oil for lubricating gears, bearings and the like is deposited to the bottom of the speed reducer casing and returns to the lubricating oil tank through the oil hole; the oil filter shell and the reducer casing are integrally designed, oil inlet and outlet of the filter element are all in an internal oil way, and when the oil pressure is lower than 40kPa, an oil low-pressure switch arranged on the rear end face of the reducer casing forces the engine to stop.
Drawings
FIG. 1 is a schematic diagram of the oil system of the micro gas turbine of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below by referring to the accompanying drawings and examples. It should be noted that the implementation manner not shown or described in the drawings is a manner known to those of ordinary skill in the art. In addition, directional terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", and the like, which are mentioned in the following embodiments, are only directions referring to the drawings. Thus, the directional terminology is used for purposes of illustration and is not intended to be limiting of the invention.
As shown in fig. 1, the lubricating oil system of the miniature gas turbine is a built-in circulation independent system, and has the main functions of providing cleaning lubricating oil with specified pressure and proper temperature for various friction pairs such as a shaft, a gear, a bearing, a sun gear assembly, an output driving gear, a rotor shaft bearing and the like in a speed reduction transmission device of the gas turbine, wherein the speed reduction transmission device comprises a speed reduction transmission case and a planetary speed reduction transmission mechanism arranged in the speed reduction transmission case, the planetary speed reduction transmission mechanism comprises at least one high-speed sun gear and a plurality of planetary gears arranged on a planetary gear frame, and the high-speed sun gear is arranged at the front end of a hollow rotor shaft. The whole lubricating oil system comprises a lubricating oil tank 1, a lubricating oil pump 2, a lubricating oil filter 3, an oil filter bypass valve 4, a system safety valve 5 and a lubricating oil distribution ring 6 which are arranged in a speed reduction transmission case. The lubricating oil tank 1 is arranged at the bottom of the reduction transmission case and is integrally formed with the reduction transmission case; the bottom of the lubricating oil pump 2 is provided with an oil inlet, the top is provided with an oil outlet, the oil inlet is communicated with the lubricating oil tank 1 through a pipeline, and the oil outlet is communicated with a lubricating oil filter 3 positioned at the upper part of the lubricating oil pump through a lubricating oil channel arranged on the speed reduction transmission case. The oil filter 3 comprises a shell and a filter element arranged in the shell, the shell of the oil filter 3 and the reduction gear casing are integrally formed, the bottom of the shell is an oil inlet, the top of the shell is an oil outlet channel of a filter element cap, a side through hole is formed in the side wall of the shell, an oil filter bypass valve 4 is arranged at the position of the side through hole, an outlet of the oil filter bypass valve 4 is communicated with the oil outlet channel of the filter element cap at the top of the oil filter 3, and when the oil filter is in normal operation, the oil entering from the bottom of the shell of the oil filter 3 passes through the filter element cap oil outlet channel at the top of the filter element and flows out of the shell, once the filter element is blocked, for example, when the oil pressure difference of an inlet and an outlet of the oil filter 3 is 100-170 kPa, the oil filter bypass valve 4 can be opened, and the oil bypasses the filter element and directly flows out of the oil filter element through the oil outlet channel of the filter element cap.
After the lubricating oil flows out of the lubricating oil filter 3, the lubricating oil sequentially enters a downstream system safety valve 5 and a lubricating oil distribution ring 6 through a lubricating oil channel arranged on the reduction gear box. An axial oil spray hole and a plurality of radial oil spray holes are arranged on the oil distribution ring 6, and the plurality of radial oil spray holes guide oil to be sprayed to a lubrication point where the high-speed sun gear is meshed with each planet gear. Bearings on other gears and gear shafts in the planetary reduction transmission mechanism are lubricated by oil mist stirred by the sun gear and the planet gears. The oil gas for lubricating the bearings of the hollow rotor shaft is provided by the axial oil spray holes distributed at the tail end of the oil distribution ring 6, the hollow rotor shaft comprises a first channel which is positioned at the center of the hollow rotor shaft and axially extends along the hollow rotor shaft and a second channel which is positioned at the periphery of the first channel, and the axial oil spray holes at the tail end of the oil distribution ring 6 guide the oil to be sprayed to the central hole of the sun gear and then flow to the rear end of the rotor shaft along the first channel of the hollow rotor shaft. An annular inner protruding table is arranged on the inner wall of the first channel of the rotor shaft, and part of oil mist is blown into the spline connection position of the rotor shaft and the sun gear by utilizing centrifugal force. The rear end of the first channel of the rotor shaft is provided with a plurality of radial holes communicated with the second channel, and the lubricating oil at the rear end of the first channel enters the second channel through the radial holes and then flows forwards along the second channel to turn back to the roller bearing and the thrust bearing at the front end of the hollow rotor shaft, and the lubricating oil flows out of the oil retainer nut through the thrust bearing and flows back to the lubricating oil tank 1.
The system safety valve 5 is arranged on a bypass oil path at the outlet of the lubricating oil pump 2, when the oil pressure at the outlet of the lubricating oil pump 2 is overlarge, a part of lubricating oil can be bypassed from the outlet of the lubricating oil pump 2 to be discharged into the reduction gearbox and flows back to the lubricating oil tank 1 under the action of gravity, and most of the lubricating oil flows to the lubricating oil distributing ring 6 positioned in the planet carrier, so that the pressure of the lubricating oil system is controlled within the range of 100-450 kPa. The system relief valve 5 is a relief valve as is common in the art and consists of a spring and a ball mounted inside the planet carrier, the spring and ball being held in the planet carrier by a relief valve housing that engages the planet carrier.
The lubricating oil tank 1 is cast integrally with the reduction gear box and has a volume of about 5L. This ensures that the oil can be ventilated for a period of about 1 minute, thereby minimising oil foaming. An oil baffle plate cast integrally with the reduction gear box is arranged between the reduction gear and the oil tank 1 to prevent the oil from contacting with the rotating gear and avoid generating foam. Further, a magnetic plug 8 is arranged at the bottom of the lubricating oil tank 1, is installed on the lubricating oil tank 1 through threads, and is sealed by using a sealing ring. The magnetic plug 8 can adsorb metal scraps in the lubricating oil and is used for monitoring the abrasion condition of the friction pair.
Further, a knob type scale may be mounted on the reduction gear box to indicate the oil level in the oil tank 1. The scale is fixed by an integral rubber sealing gasket, and when the folding ring of the scale rotates clockwise, the sealing gasket is compressed to be tightly attached to the end face of the scale.
The cartridge in the housing of the oil filter 3 is a replaceable, e.g. 10 micron cartridge through which the oil passes along a drilled passage in the cartridge end cap into a drilled passage in the main oil system to which a system relief valve 5 is connected.
The oil filter bypass valve 4 is arranged on the end cover of the filter element, the oil filter bypass valve 4 is a one-way valve common in the field, for example, the oil filter bypass valve can be a spring loaded ball-type oil filter bypass valve, when the filter element is blocked, if the pressure difference between two ends of the oil filter reaches 140kPa, the oil filter bypass valve 4 is opened, and the lubricating oil directly flows to the gears and the bearings from the bypass passage by bypassing the oil filter.
Further, a low-pressure lubricating oil switch can be arranged on the rear end face of the reduction gear box, and when the oil pressure of the lubricating oil system is lower than 40kPa, the low-pressure lubricating oil switch forces the engine to stop.
Further, a centrifugal oil-gas separator 7 can be arranged at the top of the reduction gear box, and when oil gas flows in the oil-gas separator, the oil gas is separated by the centrifugal force generated by the flow. After entering the reduction gear box, the sealed air from one side of the compressor roller bearing is mixed with oil mist in the box, oil-gas separation is carried out through the centrifugal oil-gas separator 7, and part of oil gas which is not separated is discharged to the atmosphere from the ventilation channel so as to cause oil consumption, and in addition, evaporation of the oil also causes part of the oil consumption.
The lubricating oil system is not provided with an independent lubricating oil radiator, and mainly depends on the fact that lubricating oil flows along the wall surface of the casing, and the purpose of cooling the lubricating oil is achieved through heat exchange between the wall surface and the outside.
The lubricating oil system of the gas turbine provided by the invention has the characteristic of high integration, and the lubricating oil tank is positioned below the speed reduction transmission case and is cast integrally with the case, so that the structure is compact; the lubricating oil pump is a single-stage oil pump, is arranged in the speed reduction transmission device and is directly driven by an internal gear shaft, and the lubricating oil inlet and outlet are all internal oil paths; and oil returning of the system is gravity oil returning, and lubricating oil for lubricating gears, bearings and the like is deposited to the bottom of the reduction transmission case and returns to the lubricating oil tank through the oil hole. The lubricating oil filter shell and the speed reduction transmission case are integrally designed, and oil inlet and outlet of the filter element are all in an internal oil way.
In addition, the specific embodiments described in the present specification may differ in terms of parts, shapes of components, names, and the like. All equivalent or simple changes of the structure, characteristics and principle according to the inventive concept are included in the protection scope of the present invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the invention as defined in the accompanying claims.
Claims (9)
1. An oil system of a miniature gas turbine is used for lubricating a planetary reduction transmission mechanism arranged in a reduction transmission case, the planetary reduction transmission mechanism comprises at least one high-speed sun gear and a plurality of planetary gears arranged on a planetary gear carrier, the high-speed sun gear is arranged at the front end of a hollow rotor shaft, and is characterized in that,
the lubricating oil system comprises a lubricating oil tank, a lubricating oil pump, a lubricating oil filter, an oil filter bypass valve, a system safety valve and a lubricating oil distribution ring which are arranged in the speed reduction transmission case,
the lubricating oil tank is arranged at the bottom of the speed reduction transmission case and is integrally formed with the speed reduction transmission case;
the bottom of the lubricating oil pump is provided with an oil inlet, the top of the lubricating oil pump is provided with an oil outlet, the oil inlet at the bottom of the lubricating oil pump is communicated with the lubricating oil tank through a pipeline, and the oil outlet at the top of the lubricating oil pump is communicated with the lubricating oil filter at the upper part of the lubricating oil pump through a lubricating oil channel arranged on the speed reduction transmission case;
the oil filter comprises a shell and a filter element arranged in the shell, wherein the shell of the oil filter is integrally formed with a speed reduction transmission case, the bottom of the shell is an oil inlet, the top of the shell is an oil outlet channel of a filter element cap, a side wall of the shell is provided with a bypass hole, the bypass hole is provided with an oil filter bypass valve, an outlet of the oil filter bypass valve is communicated with the oil outlet channel of the filter element cap at the top of the oil filter shell, and when the oil filter is normally operated, the oil filter bypass valve is closed and flows out of the shell from the oil outlet channel of the filter element cap at the top through the filter element, and when the filter element is blocked, the oil filter bypass valve is opened, and the oil bypasses the filter element and directly flows out of the oil filter element through the oil outlet channel of the filter element cap;
after the lubricating oil flows out from the lubricating oil filter, the lubricating oil sequentially enters a system safety valve and a lubricating oil distribution ring which are arranged on the planet gear carrier through a lubricating oil channel arranged on the speed reduction transmission case,
an axial oil spraying hole and a plurality of radial oil spraying holes are formed in the oil spraying ring, the radial oil spraying holes guide oil to be sprayed to a lubricating point where the high-speed sun gear is meshed with each planet gear, and bearings on other gears and gear shafts in the planetary reduction transmission mechanism are lubricated by oil mist stirred by the sun gear and the planet gears;
the hollow rotor shaft comprises a first channel and a second channel, the first channel is positioned in the center of the hollow rotor shaft and axially extends along the first channel, the second channel is positioned at the periphery of the first channel, an axial oil injection hole at the tail end of the oil distribution ring guides oil to be injected into a central hole of the high-speed sun gear, then the oil flows to the rear end of the hollow rotor shaft along the first channel of the hollow rotor shaft, an annular inner protruding table is arranged on the inner wall of the first channel, and part of oil mist is blown into a spline connection position of the hollow rotor shaft and the high-speed sun gear by utilizing centrifugal force; the rear end of the first channel is provided with a plurality of radial holes communicated with the second channel, the lubricating oil at the rear end of the first channel enters the second channel through the radial holes, then flows forwards along the second channel and returns to the roller bearing and the thrust bearing at the front end of the hollow rotor shaft, and the lubricating oil flows out of the oil retainer nut after passing through the thrust bearing and flows back to the lubricating oil tank under the action of gravity.
2. The oil system according to claim 1, wherein the system relief valve is provided on a bypass oil path of the oil pump outlet, and when the outlet oil pressure of the oil pump is excessive, a part of the oil is discharged into the reduction gear box through the system relief valve and flows back to the oil tank under the action of gravity, and a majority of the oil flows into the oil distributing ring.
3. The oil system of claim 2 wherein the system relief valve is a one-way valve comprising a housing, a spring and a ball mounted inside the planet carrier, the spring and ball being used to retain the housing of the system relief valve inside the planet carrier.
4. The oil system of claim 1, wherein the oil tank is integrally cast with the reduction gear box.
5. The lubricating oil system of claim 4, wherein an oil baffle plate integrally cast with the reduction gear box is arranged between the lubricating oil tank and the reduction gear mechanism to prevent lubricating oil in the lubricating oil tank from contacting the rotary reduction gear mechanism and avoid generating foam.
6. The lubricating oil system of claim 4, wherein a magnetic plug is arranged at the bottom of the lubricating oil tank, is installed on the lubricating oil tank through threads, and is sealed by using a sealing ring, and the magnetic plug can adsorb metal scraps in the lubricating oil and is used for monitoring the abrasion condition of the friction pair.
7. The lubricating oil system of claim 1, wherein a knob type scale is mounted on the reduction gear box for indicating the level of oil in the lubricating oil tank, the knob type scale is secured with an integral rubber gasket which is compressed against the end face of the scale when the folding ring of the scale is rotated clockwise.
8. The oil system according to claim 1, wherein the rear end face of the reduction gear box is provided with an oil low pressure switch which forces the engine to stop when the oil pressure of the oil system is below 40 kPa.
9. The oil system according to claim 1, wherein a centrifugal oil-gas separator is arranged at the top of the speed reduction transmission case, and seal air from one side of the compressor roller bearing enters the transmission case and is mixed with oil mist in the case, oil-gas separation is performed through the centrifugal oil-gas separator, and part of oil and gas which is not separated is discharged to the atmosphere from the ventilation channel to cause oil consumption.
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| CN108019281B true CN108019281B (en) | 2023-05-12 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111379842B (en) * | 2018-12-27 | 2022-07-12 | 中国航发商用航空发动机有限责任公司 | Lubrication system and lubrication method |
| CN110285927B (en) * | 2019-07-12 | 2020-12-01 | 中国航发常州兰翔机械有限责任公司 | Static lubricating oil sealing test device and method for front section of axial flow compressor |
| CN112360632B (en) * | 2020-12-03 | 2024-06-18 | 上海电气燃气轮机有限公司 | Oil retainer for gas turbine |
| CN113153533B (en) * | 2021-04-15 | 2023-03-28 | 中国航发湖南动力机械研究所 | Integrated aero-engine lubricating oil tank |
| CN113844660A (en) * | 2021-10-09 | 2021-12-28 | 中国航发沈阳发动机研究所 | Integrated accessory casing structure on airplane |
| CN115355089B (en) * | 2022-07-29 | 2024-08-27 | 中科航星科技股份有限公司 | Bearing oil mist lubrication cooling structure for axial center oil supply |
| CN116561933B (en) * | 2023-07-05 | 2023-09-05 | 北京航空航天大学 | Method and system for analyzing oil gas flow state of bearing cavity in aero-engine |
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| CN1693748A (en) * | 2004-04-29 | 2005-11-09 | Snecma发动机公司 | Device for lubricating component in assembly composed by multi-part |
| CN104169546A (en) * | 2012-02-23 | 2014-11-26 | 斯奈克玛 | Device for recovering lubricating oil from an epicyclic reduction gear |
| CN106461058A (en) * | 2014-03-24 | 2017-02-22 | 赛峰飞机发动机公司 | Transmission assembly including a transmission member and an oil distribution system |
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| CN1693748A (en) * | 2004-04-29 | 2005-11-09 | Snecma发动机公司 | Device for lubricating component in assembly composed by multi-part |
| CN104169546A (en) * | 2012-02-23 | 2014-11-26 | 斯奈克玛 | Device for recovering lubricating oil from an epicyclic reduction gear |
| CN106461058A (en) * | 2014-03-24 | 2017-02-22 | 赛峰飞机发动机公司 | Transmission assembly including a transmission member and an oil distribution system |
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| CN108019281A (en) | 2018-05-11 |
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