Marine supercharger lubricating system

Abstract

The invention discloses a marine supercharger lubricating system, which relates to the technical field of diesel engines and comprises a main oil supply path, a standby oil supply path and a pressure regulating oil return path which are communicated with an oil pan, a supercharger oil supply path communicated with a supercharger, a diesel engine oil supply path communicated with a diesel engine, a main oil supply path and a supercharger oil return path, the main oil supply way and the standby oil supply way are connected in parallel and communicated with the upstream of the main oil supply way, the supercharger oil supply way and the diesel engine oil supply way are connected in parallel and communicated with the downstream of the main oil supply way, and the pressure regulating oil return way is communicated with the main oil supply way. The main oil supply way is provided with a main lubricating oil pump, the standby oil supply way is provided with a lubricating oil standby pump, the pressure regulating oil return way is provided with a lubricating oil pressure regulating valve, and the supercharger oil supply way is provided with a throttling device. A bypass oil way is communicated between the supercharger oil supply way and the oil pan, and a bypass valve is arranged on the bypass oil way. Lubricating oil can be supplied to the diesel engine and the supercharger when the diesel engine and the supercharger work, pre-lubrication and post-lubrication of the supercharger can be considered, lubrication of the supercharger is good, and the service life is long.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engines, in particular to a marine supercharger lubrication system. Background Art

[0002] At present, large diesel engines such as marine diesel engines usually use turbochargers, and lubricating oil is one of the main factors affecting the operation of diesel engine turbochargers.

[0003] like Figure 1 The figure shows the lubricating oil system of the turbocharger of the common marine diesel engine. When the diesel engine is working, the diesel engine drives the main lubricating oil pump to operate. The main lubricating oil pump 1 provides lubricating oil to the diesel engine and the turbocharger. The lubricating oil regulating valve 3 adjusts the oil pressure to the oil pressure required by the diesel engine when it is running. The oil pressure required by the turbocharger is less than the oil pressure required by the diesel engine. The throttle orifice plate 4 adjusts the lubricating oil to the oil pressure required by the turbocharger. The lubricating oil standby pump 2 has the same performance as the main lubricating oil pump 1. When the main lubricating oil pump 1 fails, the lubricating oil standby pump 2 works to supply oil to the diesel engine and the turbocharger.

[0004] In the above-mentioned lubricating oil system, the supercharger and the diesel engine share the same lubrication system, but the lubricating oil conditions of the supercharger and the diesel engine are not exactly the same. The existing scheme cannot take into account the needs of pre-lubrication of the supercharger (lubrication of the supercharger before the diesel engine is started) and post-lubrication of the supercharger (lubrication of the supercharger after the diesel engine is stopped). The pre-lubrication and post-lubrication of the supercharger cannot be met, resulting in a shortened service life of the supercharger or direct damage. If a lubrication system is set up separately for the supercharger, the structure is complicated, the cost is high, and it is difficult to achieve. Summary of the invention

[0005] In view of the above shortcomings, the technical problem to be solved by the present invention is to provide a marine supercharger lubrication system, which can take into account both pre-lubrication and post-lubrication of the supercharger, ensure the normal use of the supercharger, and prolong the service life of the supercharger.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: A marine supercharger lubrication system, comprising: A main oil supply line, a standby oil supply line and a pressure regulating oil return line connected to the oil pan, a supercharger oil supply line connected to the supercharger, a diesel engine oil supply line connected to the diesel engine, a total oil supply line, and a supercharger oil return line connected between the supercharger and the oil pan; The main oil supply circuit and the backup oil supply circuit are connected in parallel, the supercharger oil supply circuit and the diesel engine oil supply circuit are connected in parallel, the main oil supply circuit and the backup oil supply circuit are connected at the upstream of the main oil supply circuit, the supercharger oil supply circuit and the diesel engine oil supply circuit are connected at the downstream of the main oil supply circuit, and the pressure regulating oil return circuit is connected to the main oil supply circuit; The main oil supply circuit is provided with a main lubricating oil pump, the backup oil supply circuit is provided with a lubricating oil backup pump, the pressure regulating return oil circuit is provided with a lubricating oil pressure regulating valve, and the supercharger oil supply circuit is provided with a throttling device; A bypass oil passage is connected between the supercharger oil supply passage and the oil pan, and the bypass oil passage is provided with a bypass valve.

[0007] Preferably, the bypass valve is a bypass pressure regulating valve.

[0008] Preferably, the lubricating oil backup pump is an electric lubricating oil backup pump.

[0009] Preferably, the throttling device is a throttling orifice plate or a throttling valve.

[0010] Preferably, the main oil supply circuit is provided with a cooler, a temperature control valve and a filter.

[0011] Preferably, along the flow direction of the lubricating oil, the cooler, the filter and the temperature control valve are arranged in sequence.

[0012] Preferably, the bypass valve and the lubricating oil backup pump are electrically connected to a control system respectively, and the supercharger is provided with a collection device for collecting supercharger information, and the collection device is electrically connected to the control system.

[0013] Preferably, the collection device is an exhaust gas temperature sensor arranged on the intake pipe of the supercharger.

[0014] Preferably, the acquisition device is a rotation speed sensor provided on the supercharger.

[0015] Preferably, the acquisition device is a lubricating oil temperature sensor provided on the supercharger, and the lubricating oil temperature sensor is used to detect the temperature of the lubricating oil.

[0016] After adopting the above technical solution, the beneficial effects of the present invention are: The marine supercharger lubrication system of the present invention can not only supply lubricating oil to the diesel engine and the supercharger when they are working, but also can take into account the pre-lubrication and post-lubrication of the supercharger. The supercharger is well lubricated before and after working, ensuring the normal use of the supercharger and prolonging the service life of the supercharger. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the principle of a lubrication system for a marine supercharger in the prior art; Figure 2 It is a schematic diagram of the principle of an embodiment of a marine supercharger lubrication system of the present invention; Figure 3 Schematic diagram of the process of supercharger pre-lubrication method; Figure 4 Schematic diagram of the process of post-lubrication method for supercharger; In the figure: 1. Main lubricating oil pump; 2. Lubricating oil standby pump; 3. Lubricating oil pressure regulating valve; 4. Throttle orifice plate; 5. Bypass valve; 6. Cooler; 7. Temperature control valve; 8. Filter; a. Main oil supply line; b. Standby oil supply line; c. Pressure regulating return oil line; d. Supercharger oil supply line; e. Diesel engine oil supply line; f. Main oil supply line; g. Supercharger oil return line; h. Bypass oil line. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] like Figure 2 As shown, a marine supercharger lubrication system comprises: A main oil supply line a, a standby oil supply line b and a pressure regulating oil return line c connected to the oil pan, a supercharger oil supply line d connected to the supercharger, a diesel engine oil supply line e connected to the diesel engine, a total oil supply line f, and a supercharger oil return line g connected between the supercharger and the oil pan; The main oil supply line a and the backup oil supply line b are connected in parallel, the supercharger oil supply line d and the diesel engine oil supply line e are connected in parallel, the main oil supply line a and the backup oil supply line b are connected to the upstream of the main oil supply line f, the supercharger oil supply line d and the diesel engine oil supply line e are connected to the downstream of the main oil supply line f, and the pressure regulating return oil line c is connected to the main oil supply line f; The main oil supply line a is provided with a main lubricating oil pump 1, the standby oil supply line b is provided with a lubricating oil standby pump 2, the pressure regulating return oil line c is provided with a lubricating oil pressure regulating valve 3, and the supercharger oil supply line d is provided with a throttling device; The supercharger oil supply passage d is connected with a bypass oil passage h, the bypass oil passage h is connected with the oil pan, and the bypass oil passage h is provided with a bypass valve 5.

[0020] When the diesel engine is working, the main lubricating oil pump 1 is working, the lubricating oil standby pump 2 and the bypass valve 5 are not working, and part of the lubricating oil in the oil pan flows into the diesel engine through the main oil supply line a, the total oil supply line f and the diesel engine oil supply line e in turn. At the same time, part of the lubricating oil in the oil pan flows into the supercharger through the main oil supply line a, the total oil supply line f and the supercharger oil supply line d in turn. The lubricating oil pressure regulating valve 3 adjusts the oil supply pressure of the diesel engine so that the oil pressure of the diesel engine oil supply line e meets the working requirements of the diesel engine. The throttling device is used to adjust the oil pressure of the supercharger oil supply line d so that its oil pressure meets the working requirements of the supercharger. The excess lubricating oil in the system flows back to the oil pan through the pressure regulating return oil line c to ensure the working of the diesel engine and the supercharger. The performance of the main lubricating oil pump 1 and the lubricating oil standby pump 2 is consistent. If the main lubricating oil pump 1 fails and does not work, the lubricating oil standby pump 2 works.

[0021] Before the diesel engine is started, the supercharger needs to be pre-lubricated, and the pre-lubricated oil pressure is lower than the oil pressure when the supercharger is working. The main lubricating oil pump 1 does not work, the lubricating oil standby pump 2 and the bypass valve 5 work, and the lubricating oil in the oil pan flows into the supercharger through the standby oil supply line b, the main oil supply line f and the supercharger oil supply line d in turn. The bypass valve 5 works, and part of the lubricating oil in the supercharger oil supply line d flows back to the oil pan through the bypass oil line h, so that the lubricating oil pressure flowing into the supercharger meets the pre-lubricating requirements, and the supercharger is pre-lubricated, and the supercharger is well lubricated before working.

[0022] After the diesel engine stops, the supercharger needs post-lubrication, and the post-lubrication oil pressure is lower than the oil pressure when the supercharger is working. The main lubricating oil pump 1 does not work, the lubricating oil standby pump 2 and the bypass valve 5 work, and the lubricating oil in the oil pan flows into the supercharger through the standby oil supply line b, the main oil supply line f and the supercharger oil supply line d in turn. The bypass valve 5 works, and part of the lubricating oil in the supercharger oil supply line d flows back to the oil pan through the bypass oil line h, so that the oil pressure of the lubricating oil flowing into the supercharger meets the post-lubrication requirements, and the supercharger is post-lubricated, and the supercharger is well lubricated after working. The supercharger is well lubricated before and after working, which ensures the normal use of the supercharger and a long service life of the supercharger.

[0023] The bypass valve 5 is preferably a bypass pressure regulating valve for regulating the oil pressure of the supercharger oil supply line d.

[0024] The lubricating oil backup pump 2 is preferably an electric lubricating oil backup pump.

[0025] The throttling device is a throttling orifice plate 4 or a throttling valve. The throttling orifice plate 4 has a simple structure, is not easily damaged and has a low cost. In this embodiment, the throttling orifice plate 4 is preferably selected.

[0026] Along the flow direction of the lubricating oil, the main oil supply line f is sequentially provided with a cooler 6, a temperature control valve 7 and a filter 8. The cooler 6 is used to cool the lubricating oil, the temperature control valve 7 is used to control the temperature of the lubricating oil, and the filter 8 is used to remove impurities in the lubricating oil.

[0027] The bypass valve 5 and the lubricating oil standby pump 2 are electrically connected to the control system respectively. The supercharger is provided with a collection device for collecting supercharger information, and the collection device is electrically connected to the control system. The collection device collects information of the supercharger to the control system, and the control system determines the operating state of the supercharger, and then determines whether the supercharger needs post-lubrication. In this embodiment, the collection device is preferably a temperature sensor, and the temperature sensor is arranged on the intake pipe of the supercharger. In other embodiments, a speed sensor for detecting the speed of the supercharger or a lubricating oil temperature sensor for detecting the temperature of the lubricating oil can also be used. The control system is a control system of a diesel engine or an ECU of a diesel engine, or a separately arranged PLC, a single-chip microcomputer, etc.

[0028] The control system also collects information on the supercharger's lubricating oil pressure, the diesel engine's startup information and speed information, and automatically performs pre-lubrication and post-lubrication pressure control on the supercharger.

[0029] like Figure 3 As shown, the supercharger pre-lubrication pressure control method includes: S1, the control system sends a start signal to the diesel engine, and the diesel engine receives the start signal; S2, the control system sends a command to the lubricating oil standby pump 2 and the bypass valve 5, the lubricating oil standby pump 2 and the bypass valve 5 are opened, and the lubricating oil standby pump 2 pumps the lubricating oil in the oil pan to the supercharger to pre-lubricate the supercharger; S3. Whether the supercharger lubricating oil pressure meets the diesel engine starting requirements within the pre-lubrication calibration time; S4. If the supercharger lubricating oil pressure meets the diesel engine starting requirement within the pre-lubrication calibration time, the diesel engine is started; if the supercharger lubricating oil pressure does not meet the diesel engine starting requirement within the pre-lubrication calibration time, S6 is executed; S5, check whether the diesel engine speed reaches the starting success speed, if yes, it means the diesel engine starts successfully, and execute S6, if no, it means the diesel engine starts unsuccessfully, and execute S6; S6. Close the lubricating oil standby pump 2 and the bypass valve 5.

[0030] like Figure 4 As shown, the method for controlling the post-lubrication pressure of the supercharger includes: S1, the control system sends a stop command to the diesel engine, and the diesel engine stops; S2, the control system sends a command to the lubricating oil standby pump 2 and the bypass valve 5, the lubricating oil standby pump 2 and the bypass valve 5 are opened, and the lubricating oil standby pump 2 pumps the lubricating oil in the oil pan to the supercharger to lubricate the supercharger; S3, collecting the exhaust gas from the supercharger intake pipe T before the diesel engine stops, and comparing it with the set calibration temperature T0, if T ≥ T0, the post-lubrication time is M1, if T < T0, the post-lubrication time is M2, preferably, 8min≤M1≤12min, 13min≤M2≤17min; S4. After the post-lubrication time is reached, close the lubricating oil standby pump 2 and the bypass valve 5.

[0031] The above are examples of the best implementation of the present invention, and the parts not described in detail are common knowledge of ordinary technicians in the field. The protection scope of the present invention shall be based on the content of the claims, and any equivalent transformation based on the technical enlightenment of the present invention is also within the protection scope of the present invention.

Claims

1. A marine supercharger lubrication system, comprising: A main oil supply line, a standby oil supply line and a pressure regulating oil return line connected to the oil pan, a supercharger oil supply line connected to the supercharger, a diesel engine oil supply line connected to the diesel engine, a total oil supply line, and a supercharger oil return line connected between the supercharger and the oil pan; The main oil supply circuit and the backup oil supply circuit are connected in parallel, the supercharger oil supply circuit and the diesel engine oil supply circuit are connected in parallel, the main oil supply circuit and the backup oil supply circuit are connected at the upstream of the main oil supply circuit, the supercharger oil supply circuit and the diesel engine oil supply circuit are connected at the downstream of the main oil supply circuit, and the pressure regulating oil return circuit is connected to the main oil supply circuit; The main oil supply circuit is provided with a main lubricating oil pump, the backup oil supply circuit is provided with a lubricating oil backup pump, the pressure regulating return oil circuit is provided with a lubricating oil pressure regulating valve, and the supercharger oil supply circuit is provided with a throttling device; Features: A bypass oil passage is connected between the supercharger oil supply passage and the oil pan, and the bypass oil passage is provided with a bypass valve.

2. A marine supercharger lubrication system according to claim 1, characterized in that: The bypass valve is a bypass pressure regulating valve.

3. A marine supercharger lubrication system according to claim 1, characterized in that: The lubricating oil standby pump is an electric lubricating oil standby pump.

4. A marine supercharger lubrication system according to claim 1, characterized in that: The throttling device is a throttling orifice plate or a throttling valve.

5. A marine supercharger lubrication system according to claim 1, characterized in that: The main oil supply circuit is provided with a cooler, a temperature control valve and a filter.

6. A marine supercharger lubrication system according to claim 5, characterized in that: Along the flow direction of the lubricating oil, the cooler, the filter and the temperature control valve are arranged in sequence.

7. A marine supercharger lubrication system according to claim 1, characterized in that: The bypass valve and the lubricating oil backup pump are electrically connected to a control system respectively. The supercharger is provided with a collection device for collecting supercharger information, and the collection device is electrically connected to the control system.

8. A marine supercharger lubrication system according to claim 7, characterized in that: The collecting device is an exhaust gas temperature sensor arranged on the intake pipe of the supercharger.

9. A marine supercharger lubrication system according to claim 8, characterized in that: The acquisition device is a rotation speed sensor arranged on the supercharger.

10. A marine supercharger lubrication system according to claim 8, characterized in that: The collecting device is a lubricating oil temperature sensor provided on the supercharger, and the lubricating oil temperature sensor is used to detect the temperature of the lubricating oil.

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