Bearing body oil supply device for rapid start-stop working condition of turbocharger and control method of bearing body oil supply device

Abstract

The invention belongs to the technical field of turbochargers, and discloses a bearing body oil supply device for the rapid start-stop working condition of a turbocharger and a control method thereof.The bearing body oil supply device for the rapid start-stop working condition of the turbocharger comprises a middle body, a center mounting hole is formed in the middle of the middle body, and an oil inlet is formed in the outer surface of the middle body; an oil inlet connector is installed at an upper port of the oil inlet, an automatic switch valve assembly is arranged in the oil inlet and located below the oil inlet connector, and the working end of the automatic switch valve assembly is connected with the lower end face of the oil inlet connector in an abutting mode and used for blocking a lower end opening of the oil inlet connector. The automatic switch valve assembly automatically controls opening and closing of an opening in the lower end of the oil inlet connector according to the oil pressure in an upstream pipeline of the oil inlet connector; oil is supplied in time after the turbocharger is started, oil is cut off in time after the turbocharger is closed, and the problem of oil leakage is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of turbochargers, and in particular relates to a bearing oil supply device for a turbocharger in a rapid start-stop operating condition and a control method thereof. Background Art

[0002] The turbocharger is connected to the engine oil pipeline through the oil inlet pipeline, and the bearing system in the turbocharger is lubricated by the engine's lubrication system. The patent application number is: CN200810139543.6, which discloses a turbocharger vortex return flow bearing body, including a bearing body mounted on the rotor shaft, the bearing body is provided with a bearing body oil inlet, a thrust bearing oil inlet, a floating bearing oil inlet and an oil return chamber, and the thrust bearing oil inlet and the floating bearing oil inlet are connected to the bearing body oil inlet through an oil delivery channel. The oil inlet of the thrust bearing and the oil inlet of the floating bearing are connected to the oil return chamber through the pressure end oil return channel, the middle oil return channel and the vortex end oil return channel respectively. A bearing body oil return port is provided at a position corresponding to the oil return chamber on the bearing body. A number of vortex guide walls are provided on the shell wall in the oil return chamber. Vortex acceleration channels are formed between adjacent vortex guide walls, which increase the vortex motion tendency of the lubricating oil and increase the oil return speed, thereby solving the problem of untimely oil return due to insufficient oil return chamber space in the turbocharger bearing body.

[0003] The above-mentioned existing turbocharger of this type delivers lubricating oil into the interior of the turbocharger through the bearing body oil inlet 11 for lubricating the bearing body on the rotor shaft. However, after the engine is shut down, the oil supply system stops supplying oil. Since the turbocharger is located at the bottom of the engine, the oil in the oil pipe will gather downward under the action of gravity and enter the supercharger through the oil inlet pipe, resulting in the risk of oil leakage in the supercharger.

[0004] At the same time, when the engine is started, it takes a certain amount of time to build up the oil pressure. Since the turbocharger is located at the bottom of the engine, it takes a certain amount of time for the lubricating oil to reach the turbocharger oil inlet. Therefore, when the turbocharger is started, there is a short period of time when the lubricating oil system cannot build up sufficient oil pressure, resulting in wear problems in the bearing system. Especially in a low temperature environment, the oil viscosity increases, the fluidity becomes worse, and the time for the oil to reach the turbocharger will be extended, which makes this problem more serious, resulting in a reduced service life of the turbocharger bearings and reliability risks. Summary of the Invention

[0005] The main technical problem to be solved by the present invention is to provide a bearing oil supply device and a control method for a turbocharger for rapid start-stop conditions, which are used to solve the oil leakage risks, reduced reliability and bearing wear in the prior art. The present invention has the advantages of simple structure, low cost and meeting the requirements of multiple working conditions.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A bearing body oil supply device for a turbocharger quick start and stop condition includes an intermediate body, a central mounting hole is provided in the middle of the intermediate body, an oil inlet is provided on the outer surface of the intermediate body, an oil inlet joint is installed at the upper end of the oil inlet, and an automatic switching valve assembly is provided in the oil inlet below the oil inlet joint, the working end of the automatic switching valve assembly is in abutment with the lower end surface of the oil inlet joint, and is used to seal the lower end opening of the oil inlet joint; when the oil pressure in the upstream pipeline of the oil inlet joint is greater than the opening pressure of the automatic switching valve assembly, the automatic switching valve assembly automatically opens; when the pressure in the upstream pipeline of the oil inlet joint is less than the opening pressure of the automatic switching valve assembly, the automatic switching valve assembly is used to seal the lower end opening of the oil inlet joint, thereby avoiding the risk of oil leakage from the turbocharger, and at the same time ensuring that some lubricating oil is always stored in the oil inlet joint, so as to quickly supply oil for the next start-up of the turbocharger.

[0007] The following is a further optimization of the above technical solution by the present invention: The oil inlet is in the shape of a stepped hole, and the overall structure of the oil inlet includes a threaded hole, a smooth hole, a mounting hole and an oil hole which are coaxially opened in sequence from top to bottom; the inner surface diameters of the threaded hole and the smooth hole are the same, and one end of the oil inlet joint is fixedly installed in the threaded hole by a threaded connection; the inner surface diameter of the mounting hole is smaller than the inner surface diameter of the smooth hole, and the inner surface diameter of the oil hole is smaller than the inner surface diameter of the mounting hole, the upper end of the oil hole is connected to the mounting hole, and the lower end of the oil hole is connected to the oil inlet cavity in the intermediate body.

[0008] Further optimization: The automatic switching valve assembly includes a one-way valve, which is installed in the oil inlet and located below the oil inlet joint. The one-way valve automatically controls the opening and closing of the lower end opening of the oil inlet joint according to the oil pressure in the upstream pipeline of the oil inlet joint.

[0009] Further optimization: the overall structure of the one-way valve includes a spring body, the lower end of the spring body is installed in the mounting hole, the lower end surface of the spring body is in contact with the bottom surface of the mounting hole, and the upper end of the spring body is fixedly connected with a steel ball.

[0010] Further optimization: A conical recessed hole is provided on the lower end surface of the oil inlet joint. The steel ball moves upward under the elastic force of the spring body and enters the conical recessed hole. The outer spherical surface of the steel ball and the inner surface of the conical recessed hole are in contact with each other, thereby sealing the lower end opening of the oil inlet joint.

[0011] Further optimization: the oil inlet is a stepped hole, and the overall structure of the oil inlet includes a threaded hole, a smooth hole, a mounting hole and an oil hole opened in sequence from top to bottom; the inner surface diameter of the threaded hole is larger than the inner surface diameter of the smooth hole, and one end of the oil inlet joint is fixedly installed in the threaded hole by a threaded connection; a plurality of oil discharge ring grooves arranged at intervals are opened on the inner surface of the smooth hole, the inner surface diameter of the mounting hole is smaller than the inner surface diameter of the smooth hole, and the threaded hole, the smooth hole and the mounting hole are coaxially arranged; the oil hole and the mounting hole are eccentrically arranged, the upper end of the oil hole is connected to the smooth hole, and the lower end of the oil hole is connected to the oil inlet cavity in the intermediate body.

[0012] Further optimization: The automatic switching valve assembly includes a control valve, which is installed in the oil inlet and located below the oil inlet joint. The control valve automatically controls the opening and closing of the lower end opening of the oil inlet joint according to the oil pressure in the upstream pipeline of the oil inlet joint.

[0013] Further optimization: The overall structure of the control valve includes a pull rod, which is coaxially arranged in the smooth hole, a shaft sleeve is provided on the lower end of the pull rod, and the shaft sleeve is fixedly installed in the mounting hole, a diaphragm is fixedly installed on the upper end of the pull rod, a sealing gasket is fixedly installed on the upper end surface of the diaphragm, and the upper end surface of the sealing gasket is sealed and top-connected with the lower end surface of the oil inlet joint; The outer surface diameter of the sealing gasket is smaller than the inner surface diameter of the smooth hole, and a radial gap C is provided between the outer surface of the sealing gasket and the inner surface of the smooth hole.

[0014] Further optimization: a spring body is sleeved on the outer side of the pull rod, the spring body is installed in the smooth hole, and the lower end of the spring body is in contact with the inner bottom surface of the smooth hole; the upper end of the spring body is fixedly connected to the lower bottom surface of the diaphragm.

[0015] The present invention further provides a method for controlling oil supply to a bearing body for a turbocharger in a rapid start-stop operating condition, based on the above-mentioned oil supply device for a bearing body for a turbocharger in a rapid start-stop operating condition, comprising the following steps: Step 1: Install the turbocharger, install the automatic switching valve assembly in the oil inlet, fix one end of the oil inlet joint at the upper end of the oil inlet, then connect the upper end of the oil inlet joint to the oil pipeline in the engine lubrication system through a pipeline, and then connect the oil return port below the intermediate body to the crankcase through a pipeline; Step 2: In the initial state, the working end of the automatic switching valve assembly is in contact with the lower end surface of the oil inlet joint to seal the lower end opening of the oil inlet joint to prevent oil leakage; Step 3: When the engine is started, the oil pressure in the upstream pipeline of the oil inlet joint is higher than the opening pressure of the automatic switching valve assembly. At this time, the automatic switching valve assembly automatically opens, and the oil in the upstream pipeline of the oil inlet joint enters the oil inlet port, thereby supplying oil and lubricating the turbocharger; Step 4. When the engine is shut down, the oil pressure in the pipeline upstream of the oil inlet joint decreases. At this time, the automatic switch valve assembly automatically closes to seal the lower end opening of the oil inlet joint to avoid the risk of oil leakage; at the same time, some oil can be stored in the pipeline upstream of the oil inlet joint.

[0016] The present invention adopts the above technical solution, which has at least the following beneficial effects: 1. In the present invention, when the engine is stopped, the oil pressure in the pipeline upstream of the oil inlet joint decreases, and when the pressure is lower than the opening pressure of the automatic switching valve assembly, the automatic switching valve assembly automatically closes. At this time, the automatic switching valve assembly is used to seal the lower end opening of the oil inlet joint, preventing the lubricating oil in the pipeline upstream of the oil inlet joint from continuing to enter the intermediate body, thereby avoiding the risk of oil leakage in the turbocharger.

[0017] 2. The control valve or the one-way valve in the present invention is controlled so that some engine oil always remains in the pipeline upstream of the oil inlet joint. Therefore, when the engine is restarted, the control valve or the one-way valve can be quickly opened, and the engine oil can quickly enter the intermediate body to lubricate the bearing system, thereby avoiding wear problems in the bearing system due to a short period of oil outage.

[0018] 3. The present invention can meet the requirements of oil storage or oil pressure buildup time under different temperatures or different working conditions by adjusting the elastic coefficient of the spring; and can also accurately control the opening size of the valve port to meet the requirements of different oil flow rates.

[0019] 4. In the present invention, the turbocharger with higher control accuracy requirements can adopt a control valve structure to control the on-off of the oil inlet, and by controlling the radial clearance C, the opening size of the valve port and the flow rate of the engine oil can be accurately controlled, thereby improving the precise control of the engine oil flow and facilitating use.

[0020] The present invention will be further described below with reference to the accompanying drawings and examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the background technology of the present invention; Figure 2 Schematic diagram of the structure of the one-way valve in Example 1 of the present invention; Figure 3 This is a schematic diagram of the installation structure at the oil inlet position in Example 1 of the present invention; Figure 4 Schematic diagram of the structure of the double spring in Example 1 of the present invention Figure 5 Schematic diagram of the structure of the conical spring in Example 1 of the present invention Figure 6 Schematic diagram of the structure of the control valve in Example 2 of the present invention Figure 7 This is a schematic diagram of the installation structure at the oil inlet position in Example 2 of the present invention; Figure 8 Schematic diagram of the structure of the cylindrical spring in Example 2 of the present invention; Figure 9 Schematic diagram of the structure of the conical spring in Example 2 of the present invention.

[0022] In the figure: 1-oil inlet joint; 11-conical recessed hole; 2-intermediate body; 21-oil inlet; 211-threaded hole; 212-smooth hole; 213-mounting hole; 214-oil hole; 215-oil drain ring groove; 22-oil return port; 23-center mounting hole; 24-oil inlet chamber; 25-oil delivery channel; 3-floating bearing; 4-thrust bearing; 5-check valve; 51-steel ball; 52-spring body; 6-control valve; 61-sealing gasket; 62-diaphragm; 63-pull rod; 64-sleeve; C-radial clearance. DETAILED DESCRIPTION

[0023] Example 1: Figure 1-3 As shown: a bearing body oil supply device for fast start and stop conditions of a turbocharger, comprising an intermediate body 2, a central mounting hole 23 being provided in the middle of the intermediate body 2, an oil inlet 21 being provided on the outer surface of the intermediate body 2, an oil inlet connector 1 being installed at the upper end portion of the oil inlet 21, an automatic switching valve assembly being provided in the oil inlet 21 below the oil inlet connector 1, the working end of the automatic switching valve assembly being in top contact with the lower end surface of the oil inlet connector 1, for sealing the lower end opening of the oil inlet connector 1; when the oil pressure in the upstream pipeline of the oil inlet connector 1 is greater than the opening pressure of the automatic switching valve assembly, the automatic switching valve assembly automatically opens; when the pressure in the upstream pipeline of the oil inlet connector 1 is less than the opening pressure of the automatic switching valve assembly, the automatic switching valve assembly is used to seal the lower end opening of the oil inlet connector 1, thereby avoiding the risk of oil leakage from the turbocharger, and at the same time ensuring that part of the lubricating oil is always stored in the oil inlet connector 1, for rapid oil supply for the next start-up of the turbocharger.

[0024] In this embodiment, the overall structure of the turbocharger can adopt a common turbocharger, and the overall structure of the turbocharger is all existing technology, such as Figure 1 As shown, the overall structure of the turbocharger includes an intermediate body 2, with a turbine and a compressor respectively installed on both sides of the intermediate body 2. The overall structure of the turbine includes a turbine casing and a turbine impeller, and the turbine impeller is rotatably installed in the turbine casing. The overall structure of the compressor includes a compressor casing and a compressor impeller, and the compressor impeller is rotatably installed in the compressor casing.

[0025] The central mounting hole 23 is opened in the middle of the intermediate body 2, and the rotor shaft is passed through the central mounting hole 23. The two ends of the rotor shaft are fixedly connected to the corresponding turbine impeller and compressor impeller respectively. The turbine impeller and the compressor impeller are rotated synchronously through the rotor shaft. A plurality of floating bearings 3 and thrust bearings 4 are installed on the rotor shaft in the central mounting hole 23 for supporting the rotor shaft to rotate.

[0026] like Figure 1 As shown, the oil inlet connector 1 of the conventional turbocharger of this type is connected to the engine oil inlet pipe and the intermediate body 2. The engine oil enters the oil inlet port 21 in the intermediate body 2 through the oil inlet connector 1, and then enters the floating bearing 3 and the thrust bearing 4 at both ends through the oil path on the intermediate body 2, thereby lubricating the floating bearing 3 and the thrust bearing 4. Due to the action of gravity, the lubricating oil enters the crankcase of the engine through the oil return port 22.

[0027] After the engine is shut down, the oil in the oil pipe enters the turbocharger due to gravity, posing a risk of oil leakage. When the engine is restarted, since it takes a certain amount of time to build up the oil pressure, the turbocharger will be without lubricating oil for a short period of time, resulting in bearing wear.

[0028] In this embodiment, an oil inlet chamber 24 is defined within the intermediate body 2 below the oil inlet 21. The lower end of the oil inlet 21 is communicated with the oil inlet chamber 24. A plurality of oil delivery channels 25 are defined below the oil inlet chamber 24. The other ends of the oil delivery channels 25 extend to the installation positions corresponding to the floating bearing 3 and the thrust bearing 4.

[0029] With this design, the lubricating oil in the oil inlet 21 enters the oil inlet chamber 24 , and the lubricating oil in the oil inlet chamber 24 is distributed to the installation positions of the floating bearing 3 and the thrust bearing 4 through multiple oil delivery channels 25 , so as to lubricate the floating bearing 3 and the thrust bearing 4 .

[0030] In this embodiment, the oil return port 22 is opened below the intermediate body 2, and the upper end of the oil return port 22 is connected to the center mounting hole 23. The oil return port 22 is connected to the crankcase through a pipeline. The lubricating oil in the center mounting hole 23 is discharged through the oil return port 22 and transported to the crankcase through the pipeline.

[0031] The oil inlet 21 is in the shape of a stepped hole. The overall structure of the oil inlet 21 includes a threaded hole 211 , a smooth hole 212 , a mounting hole 213 and an oil hole 214 which are sequentially opened from top to bottom.

[0032] The inner surface diameters of the threaded hole 211 and the smooth hole 212 are the same. An internal thread is provided on the inner surface of the threaded hole 211 . One end of the oil inlet connector 1 is fixedly mounted in the threaded hole 211 by threaded connection.

[0033] The inner surface diameter of the mounting hole 213 is smaller than the inner surface diameter of the smooth hole 212, and the inner surface diameter of the oil hole 214 is smaller than the inner surface diameter of the mounting hole 213. The upper end of the oil hole 214 is connected to the mounting hole 213, and the lower end of the oil hole 214 is connected to the oil inlet cavity 24 in the intermediate body 2.

[0034] The threaded hole 211 , the smooth hole 212 , the mounting hole 213 and the oil hole 214 are coaxially arranged.

[0035] like Figure 3 As shown, the automatic switching valve assembly includes a one-way valve 5, which is installed in the oil inlet 21 and located below the oil inlet connector 1. The one-way valve 5 automatically controls the opening and closing of the lower end opening of the oil inlet connector 1 according to the oil pressure in the upstream pipeline of the oil inlet connector 1.

[0036] In this embodiment 1, the working principle of the one-way valve 5 is as follows: when the engine is stopped, the oil pressure decreases. When the oil pressure in the oil inlet connector 1 is lower than the opening pressure of the one-way valve 5, the one-way valve 5 is used to seal the lower end opening of the oil inlet connector 1 to avoid the risk of oil leakage from the turbocharger. At the same time, some lubricating oil is always stored in the oil inlet connector 1 to quickly supply oil for the next start-up of the turbocharger; when the oil pressure at the upper port of the oil inlet connector 1 is greater than the opening pressure of the one-way valve 5, the one-way valve 5 automatically opens, so that the oil in the upstream pipeline of the oil inlet connector 1 can quickly enter the turbocharger, reducing the risk of bearing wear.

[0037] The overall structure of the one-way valve 5 includes a spring body 52, the lower end of the spring body 52 is installed in the mounting hole 213 in the oil inlet 21, and the lower end surface of the spring body 52 is in contact with the bottom surface of the mounting hole 213, which is used to limit the axial position of the spring body 52 in the oil inlet 21.

[0038] In this embodiment, the outer diameter of the spring body 52 matches the inner diameter of the mounting hole 213 , and the mounting hole 213 is used to guide the elastic expansion and contraction of the spring body 52 .

[0039] The upper end of the spring body 52 is fixedly connected to a steel ball 51 , and the upper end of the steel ball 51 is in contact with the lower end outlet of the oil inlet connector 1 .

[0040] A conical recessed hole 11 is provided on the lower end surface of the oil inlet connector 1 , and the conical recessed hole 11 is coaxially arranged with the oil inlet hole in the oil inlet connector 1 .

[0041] The steel ball 51 moves upward under the elastic force of the spring body 52 and enters the conical recessed hole 11 . At this time, the outer spherical surface of the steel ball 51 and the inner surface of the conical recessed hole 11 are in contact with each other.

[0042] With this design, the working principle of the one-way valve 5 is as follows: a one-way valve 5 is installed in the oil inlet 21 below the oil inlet connector 1. When the engine is stopped, the oil pressure decreases. When the oil pressure in the oil inlet connector 1 is lower than the opening pressure of the one-way valve 5, the spring body 52 outputs elastic force to push the steel ball 51 upward. At this time, the steel ball 51 moves upward and enters the conical recessed hole 11. The outer spherical surface of the steel ball 51 and the inner surface of the conical recessed hole 11 are in contact with each other, thereby sealing the lower end opening of the oil inlet connector 1, thereby preventing the oil in the external engine oil pipe from entering the turbocharger, reducing the risk of oil leakage in the turbocharger; at the same time, it can store some oil in the upstream pipeline of the oil inlet connector 1.

[0043] When the engine is started and the oil pressure is higher than the opening pressure of the one-way valve 5, since some oil is stored in the upstream pipeline of the oil inlet connector 1, the oil pressure in the oil inlet connector 1 pushes the steel ball 51 downward and compresses the spring body 52. The outer spherical surface of the steel ball 51 is separated from the inner surface of the conical recessed hole 11, so that the oil in the upstream pipeline of the oil inlet connector 1 can quickly enter the turbocharger, reducing the risk of bearing wear.

[0044] In this embodiment 1, Figure 3 As shown, the spring body 52 is a cylindrical spring, which can improve its overall stability and facilitate use.

[0045] In this embodiment 1, Figure 4 As shown, the spring body 52 is formed by stacking two springs, and the elastic forces of the two springs are different, one is softer and the other is harder. By stacking the two springs, the valve opening size of the one-way valve 5 can be accurately controlled to meet the requirements of different oil flow rates; at the same time, the stability of the spring is better.

[0046] In this embodiment 1, Figure 5 As shown, the spring body 52 is a conical spring, which has better stability.

[0047] Example 2: Figure 6-9 As shown, based on the above-mentioned embodiment 1, in this embodiment 2, the automatic switching valve assembly includes a control valve 6, which is installed in the oil inlet 21 and is located below the oil inlet connector 1. The control valve 6 automatically controls the opening and closing of the lower end opening of the oil inlet connector 1 according to the oil pressure in the upstream pipeline of the oil inlet connector 1.

[0048] In this embodiment 2, the working principle of the control valve 6 is as follows: when the engine is stopped, the oil pressure in the upstream pipeline of the oil inlet connector 1 decreases, and when the pressure is lower than the opening pressure of the control valve 6, the control valve 6 is used to seal the lower end opening of the oil inlet connector 1, so that the oil in the upstream pipeline of the oil inlet connector 1 cannot enter the turbocharger, thereby reducing the risk of oil leakage of the turbocharger, and at the same time storing part of the oil in the upstream pipeline of the oil inlet connector 1; when the engine is started, the oil pressure in the upstream pipeline of the oil inlet connector 1 is greater than the opening pressure of the control valve 6. At this time, the control valve 6 opens the lower end opening of the oil inlet connector 1, so that part of the oil stored in the upstream pipeline of the oil inlet connector 1 quickly enters the turbocharger, thereby reducing the risk of bearing wear.

[0049] like Figure 7 As shown, in this embodiment 2, the oil inlet 21 is in the shape of a stepped hole, and the overall structure of the oil inlet 21 includes a threaded hole 211, a smooth hole 212, a mounting hole 213 and an oil hole 214 which are sequentially opened from top to bottom.

[0050] The inner diameter of the threaded hole 211 is larger than the inner diameter of the smooth hole 212 . An internal thread is provided on the inner surface of the threaded hole 211 . One end of the oil inlet connector 1 is fixedly installed in the threaded hole 211 by threaded connection.

[0051] A plurality of oil-draining ring grooves 215 are formed on the inner surface of the polished hole 212 . The plurality of oil-draining ring grooves 215 are sequentially spaced from top to bottom and are annular in shape.

[0052] The inner diameter of the mounting hole 213 is smaller than the inner diameter of the smooth hole 212 , and the threaded hole 211 , the smooth hole 212 and the mounting hole 213 are coaxially arranged.

[0053] The inner surface diameter of the oil hole 214 is smaller than the inner surface diameter of the mounting hole 213 . The oil hole 214 and the mounting hole 213 are eccentrically arranged, and the upper end of the oil hole 214 is connected to the smooth hole 212 , and the lower end of the oil hole 214 is connected to the oil inlet chamber 24 .

[0054] In this embodiment, the overall structure of the control valve 6 includes a pull rod 63 , which is coaxially arranged in the smooth hole 212 , and a shaft sleeve 64 is sleeved on the lower end of the pull rod 63 , which is fixedly installed in the mounting hole 213 .

[0055] A diaphragm 62 is fixedly mounted on the upper end of the pull rod 63, and a sealing gasket 61 is fixedly mounted on the upper end surface of the diaphragm 62. The upper end surface of the sealing gasket 61 is sealed against the lower end surface of the oil inlet joint 1, thereby sealing the lower end opening of the oil inlet joint 1 to prevent oil leakage.

[0056] The outer diameter of the sealing gasket 61 is smaller than the inner diameter of the smooth hole 212 , and a radial gap C is provided between the outer surface of the sealing gasket 61 and the inner surface of the smooth hole 212 .

[0057] The cross section of the diaphragm 62 is U-shaped, and the diaphragm 62 and the polishing hole 212 are coaxially arranged. The outer diameter of the diaphragm 62 is smaller than the inner diameter of the polishing hole 212 .

[0058] With this design, when the oil pressure in the upstream pipeline of the oil inlet connector 1 is greater than the opening pressure of the control valve 6, the pull rod 63 drives the diaphragm 62 and the sealing gasket 61 to move downward. At this time, the sealing gasket 61 releases the seal on the lower end opening of the oil inlet connector 1, and the lubricating oil in the oil inlet connector 1 flows into the smooth hole 212 through the radial gap C, and then passes through the oil hole 214 to guide the lubricating oil into the oil inlet chamber 24, which is convenient for use.

[0059] During the opening process of the control valve 6, the pressure in the upstream pipeline of the oil inlet joint 1 continues to increase. At this time, the pull rod 63 drives the diaphragm 62 and the sealing gasket 61 to continue to move downward. When the sealing gasket 61 moves to the position of the oil drain ring groove 215, the oil drain ring groove 215 can make the separation chambers on the upper and lower sides of the sealing gasket 61 in the smooth hole 212 fully connected, thereby improving the delivery effect of the lubricating oil and improving the use effect.

[0060] In this embodiment, the lower end of the pull rod 63 is inserted into the shaft sleeve 64, and the pull rod 63 and the shaft sleeve 64 are slidably connected. The movement of the pull rod 63 can be guided by the shaft sleeve 64, which is convenient for use.

[0061] In the initial state, the upper end surface of the sealing gasket 61 is sealed against the lower end surface of the oil inlet joint 1. At this time, the lower end of the pull rod 63 is located in the shaft sleeve 64, and the lower end surface of the pull rod 63 and the inner bottom surface of the mounting hole 213 are spaced apart.

[0062] In this embodiment, if Figure 8 As shown, the distance between the upper inner surface of the oil drain ring groove 215 and the inner top surface of the smooth hole 212 is L2; the distance between the lower end surface of the pull rod 63 and the inner bottom surface of the mounting hole 213 is L1, and the length of L1 is greater than L2, thereby ensuring that the pull rod 63 can slide smoothly in the shaft sleeve 64, and can enable the upper end surface of the sealing gasket 61 to pass over the upper inner surface of the oil drain ring groove 215, which is convenient for use.

[0063] The outer side of the pull rod 63 is sleeved with a spring body 52, which is installed in the smooth hole 212, and the lower end of the spring body 52 is in contact with the inner bottom surface of the smooth hole 212; the upper end of the spring body 52 is fixedly connected to the lower bottom surface of the diaphragm 62.

[0064] With this design, the spring body 52 outputs elastic force. In the initial state, the elastic force on the spring body 52 acts on the diaphragm 62, so that the diaphragm 62 drives the sealing gasket 61 to move upward, so that the upper end surface of the sealing gasket 61 is sealed and contacted with the lower end surface of the oil inlet joint 1, thereby sealing the lower end opening of the oil inlet joint 1 to avoid oil leakage.

[0065] Based on the above embodiment 1, in this embodiment 2, as Figure 7 As shown, the spring body 52 is a cylindrical spring, which can improve its overall stability and facilitate use.

[0066] Based on the above embodiment 1, in this embodiment 2, as Figure 8 As shown, the spring body 52 is formed by stacking two springs, and the elastic forces of the two springs are different, one is softer and the other is harder. By stacking the two springs, the valve opening size of the control valve 6 can be accurately controlled to meet the requirements of different oil flow rates; at the same time, the stability of the spring is better.

[0067] Based on the above embodiment 1, in this embodiment 2, as Figure 9 As shown, the spring body 52 is a conical spring, which has better stability.

[0068] Example 3: The present invention further provides a method for controlling oil supply to a bearing body for a turbocharger in a rapid start-stop condition, based on the above-mentioned oil supply device for a bearing body for a turbocharger in a rapid start-stop condition, comprising the following steps: Step 1: Install the turbocharger. First, install the automatic switching valve assembly in the oil inlet 21, then fix one end of the oil inlet connector 1 at the upper end of the oil inlet 21, then connect the upper end of the oil inlet connector 1 to the oil pipeline in the engine lubrication system through a pipeline, and then connect the oil return port 22 below the intermediate body 2 to the crankcase through a pipeline.

[0069] Step 2: In the initial state, the working end of the automatic switching valve assembly is in contact with the lower end surface of the oil inlet connector 1 to seal the lower end opening of the oil inlet connector 1 to prevent oil leakage.

[0070] In the steps 1 and 2, when the automatic switch valve assembly adopts a one-way valve 5, the one-way valve 5 can be arranged and installed using the specific structure in Example 1, such as Figure 2-3As shown, at this time, the lower end of the spring body 52 is installed in the mounting hole 213 in the oil inlet 21, and the lower end surface of the spring body 52 is in contact with the inner bottom surface of the mounting hole 213. The upper end of the spring body 52 is fixedly connected to the steel ball 51. In the initial state, the spring body 52 outputs elastic force to push the steel ball 51 to move upward and enter the conical recessed hole 11 at the lower end of the oil inlet joint 1. At this time, the outer spherical surface of the steel ball 51 and the inner surface of the conical recessed hole 11 are in contact with each other, which is used to seal the lower end opening of the oil inlet joint 1 to prevent oil leakage.

[0071] In the steps 1 and 2, when the automatic switch valve assembly adopts the control valve 6, the control valve 6 can be arranged and installed using the specific structure in Example 2, such as Figure 6-7 As shown: at this time, the pull rod 63 is coaxially arranged in the smooth hole 212, and the lower end of the pull rod 63 is sleeved with a shaft sleeve 64, and the shaft sleeve 64 is fixedly installed in the mounting hole 213; the upper end of the pull rod 63 is fixedly installed with a diaphragm 62, and the upper end surface of the diaphragm 62 is fixedly installed with a sealing gasket 61, and the outer side of the pull rod 63 is sleeved with a spring body 52, which is installed in the smooth hole 212, and the lower end of the spring body 52 is in contact with the inner bottom surface of the smooth hole 212; the upper end of the spring body 52 is fixedly connected to the lower bottom surface of the diaphragm 62; in the initial state, the spring body 52 outputs elastic force, pushing the diaphragm 62 to move downward, and at this time the diaphragm 62 drives the sealing gasket 61 to move upward, so that the upper end surface of the sealing gasket 61 is sealed and in contact with the lower end surface of the oil inlet joint 1, thereby sealing the lower end opening of the oil inlet joint 1 to avoid oil leakage.

[0072] Step 3: After the engine is started, the oil pressure in the upstream pipeline of the oil inlet connector 1 is higher than the opening pressure of the automatic switching valve assembly. At this time, the automatic switching valve assembly automatically opens, and the oil in the upstream pipeline of the oil inlet connector 1 enters the oil inlet port 21 to lubricate the floating bearing 3 and thrust bearing 4 in the turbocharger.

[0073] In step three, when the automatic switching valve assembly adopts a one-way valve 5 and the oil pressure in the upstream pipeline of the oil inlet connector 1 is higher than the opening pressure of the one-way valve 5, the oil pressure in the oil inlet connector 1 pushes the steel ball 51 downward and compresses the spring body 52. The outer spherical surface of the steel ball 51 is separated from the inner surface of the conical recessed hole 11, thereby allowing the oil in the upstream pipeline of the oil inlet connector 1 to quickly enter the turbocharger, reducing the risk of bearing wear.

[0074] In step three, when the automatic switching valve assembly adopts the control valve 6 and the oil pressure in the upstream pipeline of the oil inlet joint 1 is higher than the opening pressure of the control valve 6, the oil pressure in the oil inlet joint 1 pushes the sealing gasket 61 to move downward, and the sealing gasket 61, the diaphragm 62 and the pull rod 63 move downward synchronously. The sealing gasket 61 releases the seal on the lower end opening of the oil inlet joint 1, and the lubricating oil in the oil inlet joint 1 flows into the smooth hole 212 through the radial gap C, so that the oil in the upstream pipeline of the oil inlet joint 1 can quickly enter the turbocharger, reducing the risk of bearing wear.

[0075] Step 4. When the engine is stopped, the oil pressure in the pipeline upstream of the oil inlet connector 1 decreases, and the oil pressure is lower than the opening pressure of the automatic switching valve assembly. At this time, the automatic switching valve assembly automatically closes to seal the lower end opening of the oil inlet connector 1, thereby preventing the oil in the pipeline upstream of the oil inlet connector 1 from entering the turbocharger, reducing the risk of oil leakage in the turbocharger; at the same time, some oil can be stored in the pipeline upstream of the oil inlet connector 1.

[0076] In step four, when the automatic switching valve assembly adopts a one-way valve 5 and the oil pressure in the upstream pipeline of the oil inlet connector 1 is lower than the opening pressure of the one-way valve 5, the spring body 52 outputs elastic force to push the steel ball 51 upward. At this time, the steel ball 51 moves upward and enters the conical recessed hole 11. The outer spherical surface of the steel ball 51 and the inner surface of the conical recessed hole 11 are in contact with each other, thereby sealing the lower end opening of the oil inlet connector 1, thereby preventing the oil in the external engine oil pipe from entering the turbocharger, reducing the risk of oil leakage in the turbocharger; at the same time, part of the oil can be stored in the upstream pipeline of the oil inlet connector 1.

[0077] In step 4, when the automatic switching valve assembly adopts the control valve 6 and the oil pressure in the upstream pipeline of the oil inlet joint 1 is lower than the opening pressure of the control valve 6, the elastic force on the spring body 52 acts on the diaphragm 62, thereby pushing the diaphragm 62 to drive the sealing gasket 61 to move upward, so that the upper end surface of the sealing gasket 61 is sealed and contacted with the lower end surface of the oil inlet joint 1, thereby sealing the lower end opening of the oil inlet joint 1 to prevent oil leakage.

[0078] For those skilled in the art, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the scope of protection of the present invention.

Claims

1. A bearing oil supply device for a turbocharger in a rapid start-stop condition, comprising an intermediate body (2), a central mounting hole (23) being provided in the middle of the intermediate body (2), an oil inlet (21) being provided on the outer surface of the intermediate body (2), an oil inlet connector (1) being provided at the upper end of the oil inlet (21), and characterized in that: An automatic switching valve assembly is provided in the oil inlet (21) below the oil inlet connector (1), and a working end of the automatic switching valve assembly is in contact with the lower end surface of the oil inlet connector (1) to seal the lower end opening of the oil inlet connector (1); when the oil pressure in the upstream pipeline of the oil inlet connector (1) is greater than the opening pressure of the automatic switching valve assembly, the automatic switching valve assembly automatically opens; when the pressure in the upstream pipeline of the oil inlet connector (1) is less than the opening pressure of the automatic switching valve assembly, the automatic switching valve assembly is used to seal the lower end opening of the oil inlet connector (1), thereby avoiding the risk of oil leakage from the turbocharger and ensuring that part of the lubricating oil is always stored in the oil inlet connector (1) to quickly supply oil for the next start of the turbocharger.

2. The bearing oil supply device for a turbocharger in a rapid start-stop condition according to claim 1, characterized in that: The oil inlet (21) is in the shape of a stepped hole. The overall structure of the oil inlet (21) comprises a threaded hole (211), a smooth hole (212), a mounting hole (213) and an oil passage hole (214) which are coaxially opened in sequence from top to bottom. The inner surface diameters of the threaded hole (211) and the smooth hole (212) are the same. One end of the oil inlet joint (1) is fixedly mounted in the threaded hole (211) by a threaded connection. The inner surface diameter of the mounting hole (213) is smaller than the inner surface diameter of the smooth hole (212). The inner surface diameter of the oil passage hole (214) is smaller than the inner surface diameter of the mounting hole (213). The upper end of the oil passage hole (214) is in communication with the mounting hole (213), and the lower end of the oil passage hole (214) is in communication with the oil inlet cavity (24) in the intermediate body (2).

3. The bearing oil supply device for a turbocharger in a rapid start-stop condition according to claim 2, characterized in that: The automatic switch valve assembly comprises a one-way valve (5), which is installed in the oil inlet (21) and located below the oil inlet connector (1). The one-way valve (5) automatically controls the opening and closing of the lower end opening of the oil inlet connector (1) according to the oil pressure in the upstream pipeline of the oil inlet connector (1).

4. The bearing oil supply device for a turbocharger in a rapid start-stop condition according to claim 3, characterized in that: The overall structure of the one-way valve (5) includes a spring body (52), the lower end of the spring body (52) is installed in the mounting hole (213), the lower end surface of the spring body (52) is in contact with the inner bottom surface of the mounting hole (213), and the upper end of the spring body (52) is fixedly connected to a steel ball (51).

5. The bearing oil supply device for a turbocharger in a rapid start-stop condition according to claim 4, characterized in that: A conical concave hole (11) is provided on the lower end surface of the oil inlet joint (1). The steel ball (51) moves upward under the elastic force of the spring body (52) and enters the conical concave hole (11). The outer spherical surface of the steel ball (51) and the inner surface of the conical concave hole (11) are in contact with each other, thereby sealing the lower end opening of the oil inlet joint (1).

6. The bearing oil supply device for a turbocharger in a rapid start-stop condition according to claim 1, characterized in that: The oil inlet (21) is in the shape of a stepped hole. The overall structure of the oil inlet (21) includes a threaded hole (211), a smooth hole (212), a mounting hole (213) and an oil hole (214) which are sequentially opened from top to bottom. The inner surface diameter of the threaded hole (211) is larger than the inner surface diameter of the smooth hole (212). One end of the oil inlet connector (1) is fixedly installed in the threaded hole (211) by means of a threaded connection. The inner surface of the smooth hole (212) is provided with a plurality of holes. The oil drain ring grooves (215) are arranged at intervals, the inner surface diameter of the mounting hole (213) is smaller than the inner surface diameter of the smooth hole (212), and the threaded hole (211), the smooth hole (212) and the mounting hole (213) are coaxially arranged; the oil hole (214) and the mounting hole (213) are eccentrically arranged, the upper end of the oil hole (214) is communicated with the smooth hole (212), and the lower end of the oil hole (214) is communicated with the oil inlet chamber (24) in the intermediate body (2).

7. The bearing oil supply device for a turbocharger in rapid start-stop operation according to claim 6, characterized in that: The automatic switch valve assembly comprises a control valve (6), which is installed in the oil inlet (21) and located below the oil inlet connector (1). The control valve (6) automatically controls the opening and closing of the lower end opening of the oil inlet connector (1) according to the oil pressure in the upstream pipeline of the oil inlet connector (1).

8. The bearing oil supply device for a turbocharger in rapid start-stop operation according to claim 7, characterized in that: The overall structure of the control valve (6) includes a pull rod (63), the pull rod (63) is coaxially arranged in the smooth hole (212), the lower end of the pull rod (63) is provided with a shaft sleeve (64), the shaft sleeve (64) is fixedly installed in the mounting hole (213), the upper end of the pull rod (63) is fixedly installed with a diaphragm (62), the upper end surface of the diaphragm (62) is fixedly installed with a sealing gasket (61), and the upper end surface of the sealing gasket (61) is sealed and top-connected with the lower end surface of the oil inlet joint (1); The outer surface diameter of the sealing gasket (61) is smaller than the inner surface diameter of the smooth hole (212), and a radial gap C is provided between the outer surface of the sealing gasket (61) and the inner surface of the smooth hole (212).

9. The bearing oil supply device for a turbocharger in rapid start-stop operation according to claim 8, characterized in that: The outer side of the pull rod (63) is provided with a spring body (52), which is installed in the smooth hole (212), and the lower end of the spring body (52) is in contact with the inner bottom surface of the smooth hole (212); the upper end of the spring body (52) is fixedly connected to the lower bottom surface of the diaphragm (62).

10. A method for controlling oil supply to a bearing body for a turbocharger in a rapid start-stop operating condition, based on the oil supply device for a bearing body for a turbocharger in a rapid start-stop operating condition according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: Install the turbocharger, install the automatic switch valve assembly in the oil inlet (21), fix one end of the oil inlet connector (1) to the upper end of the oil inlet (21), then connect the upper end of the oil inlet connector (1) to the oil pipeline in the engine lubrication system through a pipeline, and then connect the oil return port (22) below the intermediate body (2) to the crankcase through a pipeline; Step 2: In the initial state, the working end of the automatic switch valve assembly is in contact with the lower end surface of the oil inlet connector (1) to seal the lower end opening of the oil inlet connector (1) to prevent oil leakage; Step 3: When the engine is started, the oil pressure in the upstream pipeline of the oil inlet connector (1) is higher than the opening pressure of the automatic switch valve assembly. At this time, the automatic switch valve assembly automatically opens, and the oil in the upstream pipeline of the oil inlet connector (1) enters the oil inlet port (21), thereby supplying oil and lubricating the turbocharger. Step 4: When the engine is stopped, the oil pressure in the pipeline upstream of the oil inlet connector (1) decreases, and the automatic switch valve assembly automatically closes to seal the lower end opening of the oil inlet connector (1) to avoid the risk of oil leakage; at the same time, some oil can be stored in the pipeline upstream of the oil inlet connector (1).

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