CN116220858A - Circulating pre-lubrication system of dry oil pan engine and control method thereof - Google Patents
Circulating pre-lubrication system of dry oil pan engine and control method thereof Download PDFInfo
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- CN116220858A CN116220858A CN202310323712.6A CN202310323712A CN116220858A CN 116220858 A CN116220858 A CN 116220858A CN 202310323712 A CN202310323712 A CN 202310323712A CN 116220858 A CN116220858 A CN 116220858A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/02—Conditioning lubricant for aiding engine starting, e.g. heating
- F01M5/025—Conditioning lubricant for aiding engine starting, e.g. heating by prelubricating, e.g. using an accumulator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/02—Conditioning lubricant for aiding engine starting, e.g. heating
- F01M5/021—Conditioning lubricant for aiding engine starting, e.g. heating by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/02—Conditioning lubricant for aiding engine starting, e.g. heating
- F01M5/025—Conditioning lubricant for aiding engine starting, e.g. heating by prelubricating, e.g. using an accumulator
- F01M2005/026—Conditioning lubricant for aiding engine starting, e.g. heating by prelubricating, e.g. using an accumulator with an auxiliary pump
Abstract
The invention discloses a circulating pre-lubrication system of a dry oil pan engine and a control method thereof. Before the engine is started, the engine oil heated in the engine oil tank is conveyed to each friction pair along the original engine oil path by the electric duplex pre-lubrication engine oil pump, hot engine oil is adopted to fill each friction pair and an upstream lubrication pipeline of the friction pair, after heating is realized, the engine oil is circulated and returned to the engine oil tank, the conventional thinking of low-temperature pre-lubrication of the dry type oil pan engine is broken, the friction pairs such as journal bearing bushes and the like are pre-lubricated and preheated before the engine is started at low temperature, the fit clearance is close to the working state of the engine, the motion constraint is more sufficient, and the abrasion caused by insufficient motion constraint of the friction pairs is effectively reduced. The engine oil circulation carried out by the pre-lubrication system also enhances the convection of engine oil in the engine oil tank, so that the engine oil is heated more uniformly, and the engine oil in the engine oil tank has better pumpability.
Description
Technical Field
The invention relates to the technical field of engine pre-lubrication, in particular to a circulating pre-lubrication system of a dry oil pan engine and a control method thereof.
Background
About 90% of engine mechanical failures and outages are statistically related to friction pair wear. Studies have shown that although engine start time is only a small fraction of the total operating time, the total wear of each friction pair is higher than the total wear of the other operating times when the engine is started, mainly because the engine oil pump 102 is in linkage with the engine crankshaft and cannot operate independently before starting to build up sufficient oil pressure for lubrication, resulting in each friction pair operating in a dry friction state when the engine is started.
In low temperature environments, the viscosity of engine oil increases greatly and the fluidity decreases drastically, making it more difficult for the engine oil pump 102 to build up sufficient oil pressure for lubrication in time at the time of engine cold start. Although the serpentine coil 109 for heating the engine oil is often provided in the dry sump engine oil tank 100 for use in a low temperature environment, natural heat convection inside the cold and hot engine oil is difficult, and a large amount of low temperature engine oil which is difficult to pump still exists in the oil tank 100 after heating for a long time.
When each friction pair of the engine is in a low-temperature state, the fit clearance is large in a higher-temperature state. During low temperature cold start of the engine, excessive fit clearance can result in insufficient motion constraint of each friction pair of the engine, abnormal contact in the friction pair and additional wear. The existing mode of heating the engine through high-temperature cooling water can only heat the piston group-cylinder sleeve friction pair 117, but can not heat the main journal-main bearing friction pair 112, the connecting rod journal-connecting rod big end bearing friction pair 113, the connecting rod small end bushing-piston pin friction pair 116 and other friction pairs 114, and the temperature of each friction pair is still lower during low-temperature cold start.
Disclosure of Invention
In view of the above, the invention provides a circulating pre-lubrication system of a dry oil pan engine and a control method thereof, which can effectively realize pre-lubrication and heating of each friction pair of the dry oil pan engine in a low-temperature environment, reduce abrasion of the friction pair and prolong the service life of the engine.
The dry sump engine circulating pre-lubrication system of the present invention includes: the oil tank heating device and the duplex pre-lubrication oil pump; the engine oil tank heating device is used for heating engine oil in the engine oil tank; the duplex pre-lubrication oil pump comprises an oil pressing sub pump and an oil returning sub pump, wherein the oil pressing sub pump is used for conveying engine oil to an oil pump oil conveying pipe of the engine oil pump and conveying the engine oil to each friction pair of the engine and an upstream lubrication pipeline of the friction pair along the oil pump oil conveying pipe; the oil return sub pump is used for conveying the engine oil in the dry oil pan to the engine oil tank so as to finish the recycling of the engine oil.
Preferably, an oil outlet of the oil return sub-pump is connected with the oil tank through an oil outlet pipe of the oil return sub-pump; or the oil outlet of the oil return sub-pump is connected to the oil return pipe of the engine oil return pump through the oil return sub-pump check valve, and finally is connected with the oil tank.
Preferably, a one-way valve is arranged on a communication oil pipe between the oil pump and the oil pump oil delivery pipe of the oil pump.
Preferably, the oil pump and the oil return pump synchronously work and stop; when the hydraulic oil pump works, the flow of the oil return sub-pump is larger than that of the oil sub-pump.
Preferably, the oil tank heating device is a serpentine coil and a cooling water heater; the serpentine coil pipe is arranged in the engine oil tank, and high-temperature cooling water heated by the cooling water heater is introduced into the serpentine coil pipe.
Preferably, the oil tank heating device is a tower-type coil pipe and a cooling water heater; the water inlet of the tower-type coil pipe is arranged at the lower part, the water outlet is arranged at the upper part, and high-temperature cooling water heated by the cooling water heater is introduced into the tower-type coil pipe.
Preferably, in the tower-type coil, the width difference and/or the length difference of two adjacent layers of coils is greater than or equal to twice the pipe diameter of the coil.
Preferably, the tower-shaped coil pipe is in a positive tower shape or an inverted tower shape.
The invention also provides a control method of the circulating pre-lubrication system of the dry oil pan engine, which comprises the following steps:
s1, detecting the temperature of engine oil in an engine oil tank, and if the temperature T of the engine oil in the engine oil tank is less than or equal to T 1 Heating the engine oil in the engine oil tank by adopting an engine oil tank heating device; the T is 1 Is the minimum temperature that can be pumped; if the temperature T of engine oil in the engine oil tank is more than T 1 Step S2 is entered;
s2, starting a pressure oil sub-pump and an oil return sub-pump, and transmitting engine oil in an engine oil tank to each friction pair of an engine and an upstream lubrication pipeline of the friction pair through the pressure oil sub-pump and returning the engine oil to the engine oil tank through the oil return sub-pump;
s3, working t of the oil pump and the oil return pump 1 After the time, the engine is fully pre-lubricated, and the engine has safe and efficient cold start conditions, the oil pressing sub-pump and the oil returning sub-pump are closed, and the engine cold start program is entered.
Preferably, the end pressure P of the lubricating oil duct of the engine is detected, if P is stable and is greater than the pressure P higher than the normal pressure 1 When the engine is fully pre-lubricated, the engine has safe and efficient cold start conditions.
The beneficial effects are that:
before the engine is started, the engine oil heated in the engine oil tank is conveyed to each friction pair along the original engine oil path by the electric duplex pre-lubrication engine oil pump, hot engine oil is adopted to fill each friction pair and an upstream lubrication pipeline of the friction pair, after heating is realized, the engine oil is circulated and returned to the engine oil tank, the conventional thinking of low-temperature pre-lubrication of the dry type oil pan engine is broken, the friction pairs such as journal bearing bushes and the like are pre-lubricated and preheated before the engine is started at low temperature, the fit clearance is close to the working state of the engine, the motion constraint is more sufficient, and the abrasion caused by insufficient motion constraint of the friction pairs is effectively reduced. The engine oil circulation carried out by the pre-lubrication system also enhances the convection of engine oil in the engine oil tank, so that the engine oil is heated more uniformly, and the engine oil in the engine oil tank has better pumpability.
Drawings
FIG. 1 is a schematic diagram of a dry sump engine cycle pre-lubrication system according to the present invention.
FIG. 2 is a schematic illustration of the flow of oil during engine operation, operation of the lubrication system, and non-operation of the pre-lubrication system of the present invention.
FIG. 3 is a schematic illustration of the flow of oil during an engine shutdown, a lubrication system not in operation, and a pre-lubrication system of the present invention in operation.
Fig. 4 is a schematic representation of a second implementation of the pre-lubrication system of the present invention.
FIG. 5 is a schematic illustration of the heating pattern of the pre-lubrication system of the present invention to each friction pair of the engine.
FIG. 6 is a control flow of the pre-lubrication system of the present invention during cold start conditions of the engine where external auxiliary heating is required.
FIG. 7 is a control flow of the pre-lubrication system of the present invention during normal cold start conditions where the engine does not require external auxiliary heating.
Fig. 8 is a schematic diagram of a positive tower serpentine coil.
Fig. 9 is a top view of a positive tower coil, with the sections not shielded from each other in the vertical direction.
Fig. 10 is a schematic diagram of the natural convection direction of a positive tower coil.
Wherein, 100-engine oil tank; 101-a sump strainer; 102-an engine oil pump; 103-an oil pump oil delivery duct; 104-other parts of the engine lubricating system (including components such as an oil filter, an oil radiator, a piston cooling nozzle, journal bushes and the like, and components such as an oil tank, a dry oil pan, an engine oil pump, an engine oil return pump and a filter assembly are not included); 105-dry sump; 106, a return oil pump strainer; 107-an engine scavenge pump; 108-an oil return pipe of an oil return pump; 109-serpentine coil; 110-cooling water warmer; 111-an oil filter and an oil radiator; 112-main journal-main bearing friction pair; 113-connecting rod journal-connecting rod big end bearing friction pair; 114-other friction pairs; 115-piston cooling nozzle; 116-connecting rod small end bushing-piston pin friction pair; 117-piston set-cylinder sleeve friction pair; 118-an engine cooling system; 119-engine cylinder water jacket; 200-an electric duplex pre-lubrication oil pump; 201-a motor; 202-an oil pump; 203-an oil pressing sub-pump strainer; 204-an oil inlet pipe of the oil pressing sub pump; 205-oil pump oil outlet pipe; 206-a check valve of the oil pump; 207-an oil pump oil delivery duct pre-lubrication pump inlet; 208-an oil return sub-pump; 209-an oil return sub-pump oil inlet pipe; 210-a return oil sub-pump strainer; 211-an oil return sub-pump oil outlet pipe; 212-an oil return sub-pump check valve; 213-an inlet of a pre-lubrication pump of an oil return pipe of the oil return pump; 14-positive tower coil; 16-coil water inlet; 17-coil pipe water outlet.
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
The invention provides a circulating pre-lubrication system of a dry oil pan engine.
Dry sump engine lubrication systems generally include: sump 100, sump strainer 101, engine oil pump 102, oil pump oil gallery 103, dry sump 105, scavenge pump strainer 106, engine scavenge pump 107, scavenge pump scavenge pipe 108, and engine lubrication system other portions 104 including components such as an oil filter, an engine oil radiator, a piston cooling nozzle, a journal bearing shell, etc., but excluding components such as a sump, dry sump, engine oil pump, engine scavenge pump, and its associated strainer. The general structure of the other parts 104 of the engine lubrication system includes an oil filter, an oil radiator 111, a main journal-main bearing friction pair 112, a connecting rod journal-connecting rod big end bearing friction pair 113, a piston cooling nozzle 115, a connecting rod small end bushing-piston pin friction pair 116, a piston set-cylinder liner friction pair 117, and other friction pairs 114.
As shown in FIG. 1, the invention is provided with a serpentine coil 109 in the oil tank 100 to heat the engine oil in the oil tank 100; meanwhile, an electric duplex pre-lubrication oil pump 200 is arranged, wherein the electric duplex pre-lubrication oil pump 200 comprises a motor 201, an oil pressing sub-pump 202 and an oil returning sub-pump 208; the oil pump 202 directly conveys the engine oil in the oil tank 100 into the oil pump oil delivery pipe 103 and conveys the engine oil to other parts of the engine lubrication system (including components such as an engine oil filter, an engine oil radiator, a piston cooling nozzle, journal bushes and the like, and components such as the oil tank, a dry oil pan, an engine oil pump, an engine oil return pump and a strainer carried by the engine oil pump oil delivery pipe 103 are not included); the oil return sub-pump 208 conveys the engine oil in the dry oil pan 105 to the oil tank 100 to complete the recycling of the engine oil, so that the cold and hot engine oil in the oil tank 100 is mixed more uniformly, and the pumpability of the engine oil in the oil tank 100 is effectively improved at the engine starting time. According to the invention, the electric duplex pre-lubrication oil pump 200 is utilized to convey the engine oil heated in the oil tank to each friction pair along the original oil path, and the hot engine oil is adopted to fill each friction pair and the upstream lubrication pipeline thereof and heat the friction pair, so that each friction pair in a low-temperature environment can be sufficiently lubricated before starting, and the fit clearance of each friction pair is reduced.
When the engine is running, the lubrication system is working, the pre-lubrication system is not working or the pre-lubrication system is not installed, as shown in fig. 2, engine oil is pumped to an engine oil pump 102 from the bottom of an engine oil tank 100 through an engine oil tank strainer 101, pressurized by the engine oil pump 102, sent to other parts 104 of the engine lubrication system through an engine oil pump oil delivery duct 103, lubricated and falls back to a dry oil pan 105. After the engine oil pump 102 pressurizes engine oil, the engine oil flows to the pre-lubrication system oil pump 202 according to the invention through the oil pump oil delivery passage pre-lubrication pump inlet 207, but is blocked at the oil pump check valve 206, so that the pre-lubrication system does not cause pressure relief when the engine oil pump 102 works. After the engine oil falls back to the dry sump 105, the engine oil is pumped to the engine scavenge pump 107 through the scavenge pump strainer 106, pressurized, and returned to the engine oil tank 100 through the scavenge pump scavenge pipe 108. In the second embodiment shown in fig. 4, the engine oil pressurized by the engine scavenge pump 107 flows to the scavenge sub-pump 208 of the pre-lubrication system when passing through the scavenge pump scavenge pipe pre-lubrication pump inlet 213, but is blocked at the scavenge sub-pump check valve 212, and the pre-lubrication system does not cause pressure relief when the engine scavenge pump 107 is in operation.
The electric duplex pre-lubrication oil pump 200 is formed by mechanically connecting a motor 201, an oil pump 202 and an oil return pump 208, and the three pumps are rotated together after being electrified and stop working together after being powered off. During operation, the flow rate of the oil return sub-pump 208 is slightly greater than the flow rate of the oil sub-pump 202, so as to ensure that the oil in the oil tank 100 is not pumped into the other parts 104 of the engine lubrication system and the dry oil pan 105, and the engine oil pump 102 cannot pump oil to the other parts 104 of the engine lubrication system in time after the engine is started. The electric duplex pre-lubrication oil pump 200 is compact in structure, so that the electric duplex pre-lubrication oil pump is flexible in arrangement position, and can be placed outside an engine, outside the oil tank 100 or at other positions suitable for placement. In addition, compared with an engine without the pre-lubrication system, the engine with the pre-lubrication system is also provided with an oil pump strainer 203, an oil pump oil inlet pipe 204, an oil pump oil outlet pipe 205, an oil pump check valve 206, an oil pump oil delivery duct pre-lubrication pump inlet 207, an oil pump oil inlet pipe 209 and an oil pump strainer 210, and an oil pump oil outlet pipe 211 is also arranged in the form I shown in FIG. 1; a second version, shown in fig. 2, is also provided with a scavenge sub-pump check valve 212 and a scavenge pump scavenge pipe pre-lubrication pump inlet 213. The oil inlet of the oil pump 202 of the pre-lubrication system is connected with the oil tank 100 through the oil pump strainer 203 and the oil inlet pipe 204 of the oil pump, the oil outlet is connected with the oil outlet pipe 205 of the oil pump, and the oil outlet is connected with the inlet 207 of the pre-lubrication pump of the oil pump through the one-way valve 206 of the oil pump and is communicated with the oil pump oil delivery passage 103 and is connected with other parts 104 of the lubrication system of the engine. An oil inlet of the oil return sub-pump 208 is connected with the dry oil pan 105 through an oil return sub-pump oil inlet pipe 209 and an oil return sub-pump strainer 210, and an oil outlet of the oil return sub-pump 208 is connected with the oil tank 100 in two forms: in form one shown in fig. 1, the oil outlet of the oil return sub-pump 208 is directly connected to the sump 100 through an oil return sub-pump outlet pipe 211; in a second form, as shown in fig. 4, the oil outlet of the scavenge sub-pump 208 is connected to the scavenge pump scavenge pipe pre-lubrication pump inlet 213 through the scavenge sub-pump check valve 212 and to the scavenge pump scavenge pipe 108, and finally connected to the sump 100.
When the engine is stopped and the lubrication system is not in operation and the pre-lubrication system is in operation, as shown in fig. 3, the heat engine oil heated in the oil tank 100 is pumped out by the oil pump 202 through the oil pump strainer 203 and the oil pump inlet pipe 204, pressurized and then is input into other parts 104 of the engine lubrication system through the oil pump oil outlet pipe 205, the oil pump check valve 206 and the oil pump oil delivery duct pre-lubrication pump inlet 207. In the oil delivery passage 103 of the engine oil pump, part of the engine oil flows to the engine oil pump 102, but when the engine is stopped, the engine oil pump 102 cannot rotate due to linkage with the engine crankshaft, and the engine oil can only leak back to the engine oil tank 100 through a tiny fit clearance of each part in the engine oil pump 102, so that the leakage amount of the leakage phenomenon is small, and the working influence of the pre-lubrication system is very small. After heating and filling the friction pairs such as journal bearing bushes, cylinder liners, piston rings and the like in other parts 104 of the engine lubricating system, the cooled engine oil falls into the dry oil pan 105, is pumped to the oil return sub-pump 208 through the oil return sub-pump strainer 210 and the oil return sub-pump oil inlet pipe 209, and is conveyed to the direction of an engine oil tank after being pressurized. In form one, the oil flows directly back to the sump 100 through the scavenge sub-pump oil outlet pipe 211; in the second form, the oil flows through the scavenge sub-pump check valve 212 to the scavenge pump scavenge pipe pre-lubrication pump inlet 213 and flows back to the sump through the scavenge pump scavenge pipe 108. In the scavenge pump scavenge pipe 108, part of engine oil flows to the engine scavenge pump 107, but when the engine is stopped, the engine scavenge pump 107 cannot rotate due to linkage with the engine crankshaft, and engine oil can only leak back to the dry oil pan 105 through a tiny fit clearance of each part in the engine scavenge pump 107, so that the leakage amount of the leakage phenomenon is small, and the influence on the work of the pre-lubrication system is very small.
In a low temperature environment, when the engine is stopped, the lubrication system is not operated and the pre-lubrication system is operated, as shown in fig. 5, heated engine oil enters other parts 104 of the engine lubrication system through an engine oil filter and an engine oil radiator 111 and is respectively conveyed to a main journal-main bearing friction pair 112, a piston cooling nozzle 115 and other friction pairs 114. A portion of the heat engine oil delivered to the main journal-main bearing friction pair 112 is continuously delivered to the connecting rod journal-connecting rod large head bearing friction pair 113 through the oil hole in the crankshaft; the heat engine oil delivered to the piston cooling nozzle 115 is sprayed to the small-end bush-piston pin friction pair 116 and the piston group-cylinder sleeve friction pair 117; the remaining heat engine oil is delivered to other friction pairs 114. The hot engine oil not only fills the friction pairs and the upstream lubrication pipelines, but also heats the friction pairs and the upstream lubrication pipelines. Thereafter, the cooled oil falls back to the dry sump 105 and is pumped back to the sump 100 by the scavenge sub-pump 208. In this process, the high-temperature cooling water flowing in the engine cylinder water jacket 119 in the engine cooling system 118 also heats the piston group-cylinder liner friction pair 117, but does not heat each other friction pair.
The pre-lubrication system can be used under a low-temperature cold start working condition that the engine needs external auxiliary heating and a common cold start working condition that the engine does not need external auxiliary heating. As shown in fig. 6, in the low-temperature cold start condition where the engine needs external auxiliary heating, the engine oil needs to be heated to the pumpable minimum temperature T 1 The pre-lubrication system can only start working. In the external auxiliary heating process, when the oil tank temperature sensor displays the temperature T of the engine oil in the engine oil tank to be more than T 1 Thereafter, the motor 201 may be automatically controlled by a program or manually controlled to turn on, and the pre-lubrication system begins to pre-lubricate the engine and circulate the engine oil. Working t of pre-lubrication system 1 After the time, the engine is fully pre-lubricated, engine oil in the engine oil tank is fully circulated, at the moment, the engine has safe and efficient cold start conditions, and the engine cold start program can be entered after the power of the motor 201 is cut off. Pre-lubrication system on time t 1 The engine oil tank temperature T, the end pressure P of the engine lubricating oil duct or other sensor parameters can be automatically controlled by a program, and the engine oil tank temperature T, the end pressure P of the engine lubricating oil duct or other sensor parameters can be automatically determined by an operator according to the experimental result or the use experience of the pre-lubrication system.
As shown in fig. 7, under the normal cold start condition that the engine does not need external auxiliary heating, the engine oil in the engine oil tank is in an easy pumping state, and the motor 201 can be directly connected to pre-lubricate the engine before the engine is started. After the pre-lubrication system is started, when the sensor detects that the pressure P at the tail end of the lubrication oil duct of the engine is stable and is higher than the pressure P higher than the normal pressure 1 When the engine lubricating system is fully filled in other parts 104, the engine is fully pre-lubricated, and the engine has safe and efficient cold start conditions, and the engine cold start program can be started after the electric power of the motor 201 is cut off.
The engine oil used by the dry oil pan engine is circulated and heated between the engine lubricating system and the engine oil tank 100 by the pre-lubricating system, friction pairs such as journal bearing bushes and the like are pre-lubricated and preheated before the engine is started at low temperature and cold, and the engine oil pressure can be quickly built during the engine starting; the engine oil circulation carried out by the pre-lubrication system also enhances the convection of engine oil in the engine oil tank 100, so that the engine oil is heated more uniformly, and the engine oil in the engine oil tank has better pumpability; when the engine is started, each friction pair is heated, the temperature rises, the fit clearance is close to the working state of the engine, and abrasion caused by insufficient motion constraint of the friction pair is further reduced.
In addition, in order to further improve the heating efficiency of engine oil, the invention improves the engine oil tank heating device. The existing serpentine coil pipe has the advantages that the internal high-temperature cooling water conducts heat to the engine oil on the surface of the coil pipe through the pipe wall, the engine oil density heated up by heating is reduced and is increased under the action of the cold and hot engine oil density difference, and the vertical natural convection caused by the cold and hot engine oil density difference is relied on. However, the rising of the oil heated by the lower pipe of the serpentine coil is hindered by the upper pipe superposed above it, increasing the flow resistance, reducing the natural convection flow rate and eventually impairing the vertical natural convection heat exchange effect. Meanwhile, only a thinner layer of engine oil close to the pipe wall participates in heat exchange with the pipe wall, and the layer of engine oil is contacted with each layer of coil pipe and heated for multiple times in the vertical natural convection rising process, and the temperature of the engine oil is far higher than that of engine oil at other positions in an engine oil tank. This reduces the temperature differential between the oil and the walls of the pipe that are involved in heat transfer and results in a lower total heat flow between the serpentine coil and the oil and a slower increase in the average temperature of the oil.
The invention provides a tower-shaped coil, as shown in fig. 8 and 9, a common serpentine coil is replaced by a positive tower-shaped coil or an inverted tower-shaped coil (fig. 8 is a positive tower-shaped coil); the coil placement position, the coil water inlet position, the coil water outlet position and the like are basically unchanged from the original serpentine coil, and only the shape of the coil is changed. The layers of the common serpentine coil are identical in shape and overlap in the vertical direction. The length and width of each layer of coils of the positive tower coil 14 gradually decrease from the lower layer to the upper layer, as shown in fig. 8 (the layers of inverted tower coils gradually increase). As shown in fig. 9, when viewed vertically, each layer of the positive tower coil 14 is not or only partially obscured by the upper layer, which is a much smaller barrier to vertical natural convection of engine oil than a conventional serpentine coil. Preferably, the length difference and the width difference of two adjacent layers are larger than or equal to two pipe diameters, at the moment, all layers are not shielded by the upper layer, and the engine oil vertical natural convection effect is better. As shown in fig. 10, the engine oil in the vicinity of the wall of each of the pipes rises after being heated and comes out of contact with the wall of the upper pipe, forming a plurality of vertical natural convection loops. The temperature of engine oil in the engine oil tank is relatively balanced, and the pumpability is greatly improved.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A dry sump engine circulating pre-lubrication system, comprising: the oil tank heating device and the duplex pre-lubrication oil pump; the engine oil tank heating device is used for heating engine oil in the engine oil tank; the duplex pre-lubrication oil pump comprises an oil pressing sub pump and an oil returning sub pump, wherein the oil pressing sub pump is used for conveying engine oil to an oil pump oil conveying pipe of the engine oil pump and conveying the engine oil to each friction pair of the engine and an upstream lubrication pipeline of the friction pair along the oil pump oil conveying pipe; the oil return sub pump is used for conveying the engine oil in the dry oil pan to the engine oil tank so as to finish the recycling of the engine oil.
2. The dry sump engine circulating pre-lubrication system of claim 1, wherein the oil outlet of the scavenge sub-pump is connected to the sump via an scavenge sub-pump oil outlet line; or the oil outlet of the oil return sub-pump is connected to the oil return pipe of the engine oil return pump through the oil return sub-pump check valve, and finally is connected with the oil tank.
3. The circulating pre-lubrication system of a dry sump engine according to claim 1, wherein a check valve is provided on a communication oil pipe between the oil pump and an oil pump delivery pipe of the transmitter oil pump.
4. The dry sump engine circulating pre-lubrication system of claim 1, wherein the oil pump and the scavenge sub-pump are operated and stopped simultaneously; when the hydraulic oil pump works, the flow of the oil return sub-pump is larger than that of the oil sub-pump.
5. The dry sump engine circulating pre-lubrication system of claim 1, wherein the sump heating device is a serpentine coil and a cooling water warmer; the serpentine coil pipe is arranged in the engine oil tank, and high-temperature cooling water heated by the cooling water heater is introduced into the serpentine coil pipe.
6. The dry sump engine circulating pre-lubrication system of claim 1, wherein the sump heating device is a tower coil and a cooling water warmer; the water inlet of the tower-type coil pipe is arranged at the lower part, the water outlet is arranged at the upper part, and high-temperature cooling water heated by the cooling water heater is introduced into the tower-type coil pipe.
7. The dry sump engine circulating pre-lubrication system of claim 6, wherein a difference in width and/or a difference in length between adjacent two layers of coils in the tower coil is greater than or equal to twice a coil pipe diameter.
8. A dry sump engine circulating pre-lubrication system as claimed in claim 6 or 7, wherein the tower coil is either a positive tower or an inverted tower.
9. A control method of a dry sump engine circulating pre-lubrication system as claimed in any one of claims 1 to 8, comprising:
s1, detecting the temperature of engine oil in an engine oil tank, and if the temperature T of the engine oil in the engine oil tank is less than or equal to T 1 Heating the engine oil in the engine oil tank by adopting an engine oil tank heating device; the T is 1 Is the minimum temperature that can be pumped; if the temperature T of engine oil in the engine oil tank is more than T 1 Step S2 is entered;
s2, starting a pressure oil sub-pump and an oil return sub-pump, and transmitting engine oil in an engine oil tank to each friction pair of an engine and an upstream lubrication pipeline of the friction pair through the pressure oil sub-pump and returning the engine oil to the engine oil tank through the oil return sub-pump;
s3, working t of the oil pump and the oil return pump 1 After the time, the engine is fully pre-lubricated, and the engine has safe and efficient cold start conditions, the oil pressing sub-pump and the oil returning sub-pump are closed, and the engine cold start program is entered.
10. The control method as set forth in claim 9, wherein the end pressure P of the engine lubrication passage is detected, if P has stabilized and is greater than a pressure P higher than normal pressure 1 When the engine is fully pre-lubricated, the engine has safe and efficient cold start conditions.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310323712.6A CN116220858A (en) | 2023-03-29 | 2023-03-29 | Circulating pre-lubrication system of dry oil pan engine and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310323712.6A CN116220858A (en) | 2023-03-29 | 2023-03-29 | Circulating pre-lubrication system of dry oil pan engine and control method thereof |
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| CN116220858A true CN116220858A (en) | 2023-06-06 |
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| CN202310323712.6A Pending CN116220858A (en) | 2023-03-29 | 2023-03-29 | Circulating pre-lubrication system of dry oil pan engine and control method thereof |
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| CN (1) | CN116220858A (en) |
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