CN212337438U

CN212337438U - Forced lubrication system of supercharger

Info

Publication number: CN212337438U
Application number: CN202020544317.2U
Authority: CN
Inventors: 余超; 覃星念; 杨仕明; 叶双超; 黎华文
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2021-01-12
Anticipated expiration: 2030-04-14

Abstract

The utility model belongs to the field of engines, in particular to a forced lubrication system of a supercharger, which comprises a supercharger, an oil inlet pipeline and an oil return pipeline which are respectively arranged at two ends of the supercharger, an engine main oil pump which is arranged on the oil inlet pipeline, and the forced lubrication system of the supercharger also comprises an electronic oil pump which is arranged at the downstream of the engine main oil pump in series connection, wherein the electronic oil pump is arranged on the oil inlet pipeline and comprises a shell and an impeller which is arranged inside the shell, an annular circulation gap is arranged between the impeller and the shell, the cross-sectional area of the circulation gap is larger than the minimum circulation area of the pipeline of the forced lubrication system of the supercharger, and the oil; the electronic oil pump is adopted, so that the problems of dry grinding, high-temperature coking and the like of a supercharger rotor system are avoided, the running time of the electronic oil pump is reduced, and the service life of the electronic oil pump is prolonged.

Description

Forced lubrication system of supercharger

Technical Field

The utility model belongs to the engine field specifically is a booster forced lubrication system.

Background

Superchargers have been widely used in engines for their effectiveness in increasing engine power, reducing fuel consumption, and improving emissions. The turbocharger is connected with the exhaust pipe when in work, and the rotating speed of the turbocharger is up to hundreds of thousands of revolutions per minute when in normal work, so that the rotating shaft and the bearing of the turbocharger must be ensured to be good, and a large amount of heat in the turbocharger is taken away from the turbocharger through the flowing of cooling liquid, thereby playing a role in protection.

For the supercharger, the traditional lubricating and cooling mode is that the supercharger of an engine is lubricated by certain engine oil and engine oil pressure provided by an engine oil pump, and meanwhile, the heat is brought back to an oil pan by utilizing the flowing of the lubricating oil to play a role in lubrication and cooling. When the engine is normally stopped, the temperature of an exhaust system is reduced in a mode that the engine runs for 3-5 minutes at idle speed, so that the temperature of a bearing is reduced, and the protection of the supercharger is realized.

Traditional booster lubrication and cooling mode, like the turbo charger protection device that cuts off oil that chinese patent CN103184928A disclosed, includes a tee bend water pipe, and turbo charger is connected to the first branch road of this tee bend water pipe, and the lubricated oil circuit of engine is connected to the second branch road, and booster protection device that cuts off oil is connected to the third branch road, wherein: a one-way valve which is communicated from the engine to the three-way water pipe in one way is arranged in the first branch; the oil cut-off protection device stores lubricating oil when the engine is normally operated, and inputs the stored lubricating oil into the supercharger when the engine is stopped. The turbocharger oil-stop protection device can store lubricating oil when an engine runs, and can input the stored lubricating oil into the turbocharger for cooling and lubricating when the engine stops, so that the turbocharger oil-stop protection device can save energy and is suitable for the conditions of frequent starting and stopping and accidental stopping of the engine. However, it has the following disadvantages:

1. when the engine is started, the supercharger has oil supply delay time which is generally 5-8 s, so that great design limitation is imposed on an oil inlet system of the supercharger, and the oil supply delay time of 5-8 s is ensured if an oil inlet pipe cannot be designed to be too long; meanwhile, because the supercharger has oil supply delay time, if a user directly steps on an accelerator when starting the engine by misoperation or the hybrid power is in an oil-saving control mode, the power of the engine is directly pulled to a fuel economy point after the engine is started, so that the condition that a supercharger rotor system reaches a very high rotating speed without starting lubrication and the rotor system is dry-ground, and faults such as bearing abrasion, shaft breakage and the like occur;

2. when the engine is normally stopped, the supercharger needs to be cooled, the engine needs to idle for a long enough time, and a lot of energy is wasted;

3. if the engine is suddenly stopped due to uncertain factors, the engine oil cannot be continuously provided for the supercharger for lubrication protection at the moment, a large amount of heat accumulated at a rotating shaft and a bearing of the supercharger cannot be dissipated in time, and after the engine is stopped, an impeller of the supercharger still continuously rotates for a period of time under the condition of no engine oil due to inertia, so that the local overheating of the supercharger can be caused, the rotating shaft and the bearing of the supercharger can be burnt, and the service life of the supercharger and even the whole engine can be shortened;

4. on some engines which are frequently started and stopped, such as diesel oil and electric power hybrid engines, there is not enough time to idle and dissipate heat, and the idling mode cannot meet the requirement of effectively protecting the supercharger.

For another example, chinese patent CN206158851U discloses a lubrication oil path for a supercharger of a hybrid power engine, which uses a motor oil pump to pump oil continuously by the electronic oil pump after the engine is stopped, so as to provide oil for lubrication and cooling of the supercharger of the hybrid power vehicle, but the electronic oil pump needs to operate constantly to cool the supercharger, so that the motor oil pump has a long working time, thereby reducing the service life of the motor oil pump, and increasing the risk of water shortage and rapid failure of the supercharger due to the damage of the electronic oil pump.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a forced lubrication system of a supercharger, when an engine provides a starting signal, an electronic oil pump starts to operate, the delay time of oil supply of the supercharger is shortened, and a rotor system is lubricated quickly; when the engine is stopped, the electronic oil pump can continue to operate to take away the heat of an exhaust system, so that the problems of dry grinding, high-temperature coking and the like of a supercharger rotor system caused by frequent starting and stopping of the engine, misoperation of a user and special application of hybrid power are solved; the electronic oil pump is provided with a flow area, so that the lubrication of the supercharger can be realized without starting the electronic oil pump, the running time of the electronic oil pump is reduced, and the service life of the electronic oil pump is prolonged.

The technical scheme of the utility model as follows: the electronic engine oil pump is arranged on the oil return pipeline, the viscosity of the engine oil is reduced after the engine oil passes through the supercharger, the working load of the electronic engine oil pump can be reduced, and the service life of the electronic engine oil pump is prolonged;

the electronic engine oil pump comprises a shell and an impeller arranged in the shell, an annular circulation gap is arranged between the impeller and the shell, the circulation gap is arranged on the outer side of the circumference of the impeller, and engine oil can circulate from the circulation gap when the electronic engine oil pump stops working. The cross-sectional area of the flow gap is larger than the minimum flow area of a pipeline of a supercharger lubricating system, and the oil return pipeline 3) is communicated with an oil pan of an engine to form a lubricating cycle.

The electronic oil pump and the engine main oil pump are arranged in series, so that the problems of dry grinding, high-temperature coking and the like of a supercharger rotor system caused by frequent starting and stopping of an engine, misoperation of a user and special application of hybrid power are solved; in addition, the flow area of the electronic oil pump is set, the lubrication of the supercharger can be realized without starting the electronic oil pump, the running time of the electronic oil pump is reduced, and the service life of the electronic oil pump is prolonged.

Preferably, the utility model discloses still include the bearing temperature sensor who sets up on the booster, bearing temperature sensor forms closed-loop control according to the bearing temperature that bearing temperature sensor monitored, the machine oil flow and the booster bearing temperature of accurate control electronic oil pump;

furthermore, the utility model discloses also can not take bearing temperature sensor, electronic oil pump and engine main oil pump are markd according to the engine, define out safe machine oil flow.

Preferably, the cross-sectional area of the circulation gap is equivalent to the pipe diameter area with the inner diameter of 10-15 mm, the engine oil circulation area in the range can meet the flow requirement of a lubricating system, the engine oil passing through the impeller can be accelerated, the engine oil pump is not easily damaged due to the heat dissipation block, and the service life of the electronic engine oil pump is greatly prolonged.

The utility model has the advantages that:

1. the series electronic oil pump is adopted, so that the problems of high-temperature coking of a supercharger rotor system and the like caused by frequent starting and stopping of an engine, misoperation of a user and special application of hybrid power are solved.

2. The electronic oil pump is arranged on the oil return pipeline and adopts a special structural design, namely, an annular circulation gap is formed between the impeller and the shell, so that the running time of the electronic oil pump is reduced, the service life of the electronic oil pump is prolonged, and meanwhile, the failure risk of the supercharger in oil shortage caused by the fact that the supercharger is blocked due to damage of the electronic oil pump is avoided.

Drawings

Fig. 1 is a block diagram illustrating a structure of a forced lubrication system of a supercharger according to the present invention.

Fig. 2 is a schematic diagram of the electronic engine oil pump of the present invention.

In the figure: 1-supercharger, 2-oil inlet pipeline, 3-oil return pipeline, 4-oil pan, 5-electronic oil pump, 501-shell, 502-impeller, 503-circulation gap, 6-engine main oil pump, 7-bearing temperature sensor and 8-engine controller.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.

Example 1:

as shown in fig. 1 and fig. 2, a forced lubrication system for a supercharger includes a supercharger 1, an oil inlet pipeline 2 connected to an oil inlet side of the supercharger 1, an oil return pipeline 3 connected to an oil outlet side of the supercharger 1, an engine main oil pump 6 disposed on the oil inlet pipeline 2, and an electronic oil pump 5 disposed in series at a downstream of the engine main oil pump 6, wherein the electronic oil pump 5 is disposed on the oil return pipeline 3, and the oil return pipeline 3 is communicated with an oil pan 4 of the engine.

As shown in fig. 2, the electronic oil pump 5 includes a housing 501 and an impeller 502 disposed inside the housing 501, an annular flow gap 503 is disposed between the impeller 502 and the housing 501, and a cross-sectional area of the flow gap 503 is larger than a minimum flow area of a pipe of a supercharger forced lubrication system.

The electronic oil pump 5 and the engine main oil pump 6 are arranged in series, when the engine normally runs, because the flow gap 503 is arranged in the electronic oil pump 5, a certain flow area exists, the electronic oil pump 5 does not need to be started under most engine working conditions, the lubrication of the supercharger can be realized depending on the engine main oil pump 6, when the engine main oil pump 6 is not enough to lubricate the supercharger 1, the electronic oil pump 5 is started to provide higher engine oil flow, the electronic oil pump 5 can be set to be in a normally open state, the starting strategy of the electronic oil pump 5 can be determined according to the calibration of the engine, the design reduces the running time of the electronic oil pump 5, prolongs the service life of the electronic oil pump 5, and simultaneously avoids the risk that the supercharger 1 is short of oil and fails quickly due to the fact that the electronic oil pump 5 is damaged to block.

Example 2:

The present embodiment further comprises a bearing temperature sensor 7 provided on the supercharger 1.

The cross-sectional area of the flow-through gap 503 corresponds to the area of a pipe diameter having an inner diameter of 10 mm.

The engine oil sequentially passes through an oil inlet pipeline 2, an engine main engine oil pump 6, an electronic engine oil pump 5, a supercharger 1 and an oil return pipeline 3 and finally enters an oil circulation passage 4.

The electronic oil pump 5 is arranged on the oil inlet side of the supercharger 1 and is connected with the engine main oil pump 6 in series, a pressurizing and lubricating system takes oil from the high-pressure side of the engine internal circulation main oil pump, a certain flow area is formed inside the electronic oil pump 5, the electronic oil pump 5 does not need to be started under most engine working conditions, lubrication of the supercharger can be achieved depending on the engine main oil pump 6, and when the engine main oil pump 6 is insufficient for lubricating the supercharger 1, the electronic oil pump 5 is started to provide higher engine oil flow. The design reduces the running time of the electronic oil pump 5, prolongs the service life of the electronic oil pump 5, and simultaneously avoids the risk of quick failure of oil shortage of the supercharger 1 caused by the fact that the electronic oil pump 5 is damaged to block an oil inlet pipeline of the supercharger 1.

When the engine is stopped, the electronic oil pump 5 continues to operate for a period of time, and the temperature of the exhaust system is reduced, so that the temperature of the bearing is reduced, and the supercharger 1 is protected; the electronic oil pump 5 can set the rotating speed and delay the oil supply at regular time, a bearing temperature sensor 7 arranged on the supercharger 1 is additionally arranged, the bearing temperature sensor 7 and the electronic oil pump 5 are both electrically connected with an engine controller 8, and the oil supply delay time and the temperature of the bearing of the supercharger 1 are accurately controlled in a closed-loop manner according to the temperature of the bearing. The engine controller 8 is an ECU electronic control unit, also called a traveling computer, and is a special microcomputer controller for the engine.

Example 3:

the difference between this embodiment and embodiment 2 is that the cross-sectional area of the flow gap 503 corresponds to the pipe diameter area with an inner diameter of 15mm, the bearing temperature sensor 7 is not provided in this embodiment, and the electronic oil pump 5 defines a safe oil flow rate according to the engine calibration.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. The utility model provides a booster forced lubrication system, includes booster (1), connects oil inlet pipeline (2) of booster (1) oil feed side connects oil return pipeline (3) of booster (1) oil outlet side sets up engine main oil pump (6) on oil inlet pipeline (2), its characterized in that: the engine oil return device is characterized by further comprising an electronic oil pump (5) which is arranged on the downstream of the engine main oil pump (6) in series, wherein the electronic oil pump (5) is arranged on the oil return pipeline (3), the electronic oil pump (5) comprises a shell (501) and an impeller (502) which is arranged in the shell (501), an annular circulation gap (503) is arranged between the impeller (502) and the shell (501), the cross-sectional area of the circulation gap (503) is larger than the minimum circulation area of a pipeline of a supercharger forced lubrication system, and the oil return pipeline (3) is communicated with an oil pan (4) of the engine.

2. A supercharger forced lubrication system according to claim 1, characterised in that: the turbocharger also comprises a bearing temperature sensor (7) arranged on the supercharger (1).

3. A forced lubrication system for a supercharger according to any one of claims 1 to 2, wherein: the cross-sectional area of the flow gap (503) is equivalent to the pipe diameter area with the inner diameter of 10-15 mm.