Integrated generator self-lubricating system

Abstract

The invention relates to an integrated generator self-lubricating system which comprises a diesel engine, a generator, an integrated common base, a generator lubricating oil tank, a lubricating oil coarse filter, a lubricating oil heater, a one-way valve, an electric lubricating oil pump, a three-way valve, a lubricating oil fine filter, a flow switch, a generator front bearing and a generator rear bearing. The generator lubricating oil tank is integrally arranged on the integrated public base and does not need to occupy the space of a cabin independently. Oil return openings are formed in the two sides of a front bearing and the two sides of a rear bearing of the generator respectively and directly communicate with a lubricating oil tank of the generator through pipelines, and a double-side oil return structure is formed. The lubricating oil tank of the generator is integrated on the common base, so that an oil supply system is simplified, and the demand and occupation of peripheral resources are reduced; through the mode of integrating and arranging the lubricating oil tank nearby, oil return is conducted by means of gravity, an oil return power system is saved, and oil return reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine power equipment, in particular to an integrated generator self-lubricating system suitable for a marine high-power diesel generator set. BACKGROUND

[0002] At the current stage, the bearings used by the generators of diesel generator sets are mainly divided into oil lubricated bearings and rolling bearings. The rolling bearings have the advantages of more convenient maintenance, but have the disadvantages of insufficient load capacity and service life. The main advantages of oil lubricated bearings are high load capacity, but the disadvantages are complex system and more resource requirements. However, for a high-power diesel generator set, due to its large weight and high service life requirement, based on the use characteristics and mission requirements, the generator must adopt the structure of oil lubricated bearings.

[0003] At present, the lubricating system of marine generators mainly depends on the auxiliary system of the engine room to meet the requirements. The system pipeline and auxiliary equipment configuration are complex, and the system resources occupied are more, which brings certain difficulty to the arrangement of the cabin, and the complex system also brings the risk of lower basic reliability.

[0004] In the prior art, patent (CN119467049A) discloses a generator redundant lubricating system based on an electric oil pump, which adopts two electric oil pumps in parallel as a redundant configuration to ensure the safety of the unit through interlocking and power loss protection. However, the oil tank of this system is independently set, which occupies additional cabin space, increasing the difficulty of cabin arrangement. At the same time, the oil pipe is long and the number of joints is large, which not only increases the risk of oil leakage, but also causes large kinetic energy loss. In addition, the oil return relies on natural backflow of the pipeline, which may cause poor oil return under the conditions of ship inclination and swing. Patent (CN216743772U) discloses a generator oil lubricating system based on a pneumatic pump and an electric pump, which solves the problem of power loss by backup configuration of the electric pump and the pneumatic pump. However, this system also adopts an independent oil tank design, and the pipeline layout is not optimized, which still has the defects of high space occupancy and complex pipeline. In addition, the oil filling and discharge need to be separately set, which increases the system resource occupation, and the oil return structure is not optimized for ship swing conditions, which has insufficient oil return reliability.

[0005] Therefore, how to optimize the structure integration to solve the problems of large space occupation, complex pipeline, unreliable oil return and high system resource occupation of the existing lubricating system has become a technical problem to be solved in this field. SUMMARY

[0006] The application aims to solve the problem of too complex resources required by the generator using rolling bearings, whether the existing resources can be used to reduce the demand for external resources, improve equipment utilization and cabin occupancy, improve the basic reliability of the equipment, and provide an integrated generator self-lubricating system.

[0007] To achieve the above-mentioned purpose, the technical scheme of the application is: an integrated generator self-lubricating system, comprising a diesel engine, a generator, an integrated common base, a generator lubricating oil tank, a lubricating oil coarse filter, a lubricating oil heater, a one-way valve, an electric lubricating oil pump, a three-way valve, a lubricating oil fine filter, a flow switch and front and rear bearings of the generator; the generator lubricating oil tank is integrally arranged on the integrated common base, without the need for separate cabin space; the front and rear bearings of the generator are respectively provided with oil return ports, and the oil return ports are directly communicated to the generator lubricating oil tank through pipelines, forming a double-sided oil return structure.

[0008] Further, the oil inlet end of the electric lubricating oil pump is connected to the generator lubricating oil tank through the lubricating oil coarse filter, the lubricating oil heater and the one-way valve, and the oil outlet end is connected to the three-way valve; the three-way valve selectively communicates the lubricating oil fine filter and the interface J1, and the interface J1 has the functions of lubricating oil filling and waste oil extraction; the oil outlet end of the lubricating oil fine filter is divided into two paths and connected to the oil inlets of the front and rear bearings of the generator through the flow switch, realizing directional oil supply.

[0009] Further, the distance between the generator lubricating oil tank and the generator is not more than 50 cm, and the total length of the oil inlet pipeline is not more than 1.5 times the distance from the generator axis to the edge of the integrated common base, so as to shorten the pipeline path and reduce kinetic energy loss.

[0010] Further, the oil return ports of the double-sided oil return structure are arranged symmetrically along the axial direction of the generator bearing, and realize unpowered oil return by gravity, adapting to the inclination and swing working conditions of the ship.

[0011] Further, the interface J1 is connected to the cabin waste oil tank and the lubricating oil supply source through pipelines, and the three-way valve is an electromagnetic control three-way valve, whose working position is switched by the output signal of the control box, realizing the lubricating oil supply and discharge of "one port for two purposes".

[0012] Further, the lubricating oil heater is connected in series between the lubricating oil coarse filter and the one-way valve, and its starting threshold is set to automatically start when the lubricating oil temperature is lower than 20℃, and stop when heated to 30℃-40℃, ensuring the flowability of the lubricating oil in a low temperature environment.

[0013] Further, an oil cooler, a thermostatic valve and a temperature sensor are further included, the temperature sensor is arranged at the oil outlet end of the oil filter, the oil cooler and the thermostatic valve are connected in series between the oil filter and the flow switch, and the control box adjusts the opening degree of the thermostatic valve according to the signal of the temperature sensor, so that the oil temperature is stabilized in the lubrication range of 40-60 DEG C.

[0014] Further, the flow switch is electrically connected with the control box, the preset oil flow threshold value is 5-8 L / min, when the flow is detected to be lower than the threshold value, the control box synchronously sends an alarm signal and performs interlocking control, if the generator is not started, the starting is prohibited, and if the generator is started, the pneumatic oil pump is started or the diesel engine is stopped.

[0015] Further, the oil inlet pipelines of the front and rear bearings of the generator are respectively provided with flow hole plates, so that the oil supply pressure of the front and rear bearings is balanced, and local excessive or insufficient oil supply is avoided.

[0016] Further, the oil level sensor is arranged in the oil tank of the generator, and the oil level sensor is electrically connected with the control box, when the oil level is detected to be lower than the preset lower limit or higher than the preset upper limit, the control box sends an oil level abnormality alarm signal, and reminds the operator to supplement or discharge.

[0017] The beneficial effects of the present application are as follows: 1. The oil supply system is simplified, and the demand and occupation of peripheral resources are reduced by integrating the oil tank of the generator in the common base. 2. The oil return power system is saved, and the oil return reliability is improved by arranging the oil tank in an integrated and nearby manner and relying on gravity for oil return. 3. The oil return capacity and reliability are improved by arranging the oil tank in a double-side oil return manner. 4. The oil tank is arranged with an oil extraction / injection port, so that the oil is autonomously replaced and injected. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a structural schematic view of the integrated generator self-lubricating system of the present application; Figure 2 FIG. 2 is an application schematic view of the integrated generator self-lubricating system of the present application; In the figure, 1 is a diesel engine, 2 is a generator, 3 is an integrated common base, 4 is an oil tank, 6 is an oil heater, 7 is a one-way valve, 8 is an electric oil pump, 9 is a three-way valve, 10 is an oil filter, 11 is a flow switch, 12 is a flow hole plate, 13 is a generator bearing, 14 is an oil cooler, 15 is a temperature sensor, 16 is a thermostatic valve, J1 is an oil extraction and injection port of the oil tank, J2 is an oil inlet and return port of the generator bearing, and J3 is an oil inlet port of the generator bearing. DETAILED DESCRIPTION

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 As shown in Figure 2, an integrated generator self-lubricating system of the present invention includes a diesel engine 1, a generator 2, an integrated common base 3, a generator oil tank 4, a coarse oil filter, an oil heater 6, a one-way valve 7, an electric oil pump 8, a three-way valve 9, a fine oil filter 10, a flow switch 11, a flow cut-off orifice plate 12, a generator bearing 13, an oil cooler 14, a temperature sensor 15, a thermostatic valve 16, an oil tank oil extraction and filling port J1, a generator bearing oil inlet and return port J2, and a generator bearing oil inlet port J3.

[0021] The generator oil tank 4 is integrated on the integrated common base 3, closely attached to the generator 2, eliminating the need for a separate compartment and shortening the length of the oil inlet pipeline. Symmetrical oil return ports are located on both sides of the generator's front and rear bearings, connected to the generator oil tank 4 via inclined pipelines, forming a double-sided oil return structure that relies on gravity for unpowered oil return. The inlet of the electric oil pump 8 is connected to the generator oil tank 4 via a coarse oil filter, an oil heater 6, and a one-way valve 7, while the outlet is connected to a three-way valve 9. The three-way valve 9 selectively connects to the fine oil filter 10 and interface J1, respectively. Interface J1... It has both lubricating oil filling and waste oil extraction functions, realizing "one port for two uses"; the oil outlet of the lubricating oil fine filter 10 is connected in series with the lubricating oil cooler 14, the thermostatic valve 16 and the temperature sensor 15, and then splits into two paths, which are connected to the oil inlets of the front and rear bearings of the generator through the throttling orifice plate 12 and the flow switch 11 respectively; the flow switch 11, the temperature sensor 15, the thermostatic valve 16, the electric lubricating oil pump 8 and the generator 2 are all electrically connected to the control box to realize signal feedback and interlock control.

[0022] During normal operation of all equipment, the electric lubricating oil pump 8 draws lubricating oil from the generator oil tank 4. After passing through the lubricating oil coarse filter, lubricating oil heater 6, one-way valve 7, three-way valve 9, and lubricating oil fine filter 10, the lubricating oil is divided into two streams and then supplied to the front and rear bearings 13 of the generator 2 via the flow switch 11. After being supplied to the front and rear bearings of the generator, the lubricating oil returns to the oil tank 4 through the return ports on both sides of the bearings by gravity.

[0023] The set generator lubricating oil tank 4 is integrated on the existing common base, without separately occupying cabin space to arrange the lubricating oil tank, saving resource arrangement. Meanwhile, the integrated lubricating oil tank adopts the principle of proximity, so that the generator oil inlet system pipeline is relatively short, which saves space and simplifies the lubricating oil pipeline system, reduces the configuration of pipeline and joint, reduces the demand for kinetic energy source, reduces the possibility of oil leakage at the joint, and improves the reliability of the lubricating oil system. In addition, the integrated generator lubricating oil tank is closer to the generator bearing, so that the oil can be directly returned by gravity without the need to configure a power device for oil return, and the setting of the double-side oil return can make the ship successfully return oil in the case of inclination and swing, further improving the oil return capacity and reliability.

[0024] When the lubricating oil reaches the service life or appears dirty, etc., the lubricating oil can be pumped from the generator lubricating oil tank 4 to the cabin dirty oil tank along the interface J1 through the electric lubricating oil pump 8 by switching the three-way valve 9. When it is first filled after leakage or replacement, the lubricating oil can be filled from the cabin to the generator lubricating oil tank 4 along the interface J1 through the electric lubricating oil pump 8 by switching the three-way valve 9. The interface J1 provided here can realize the functions of oil pumping and oil filling, realize "one mouth for two purposes", and save system resource arrangement.

[0025] As shown in Figure 2 , a certain diesel generator set generator lubricating oil system is designed according to an integrated generator self-lubricating system, and the system state runs well in use. The electric lubricating oil pump 8 pumps out the lubricating oil from the generator lubricating oil tank 4 after being powered on, and the lubricating oil is preliminarily filtered through the lubricating oil coarse filter 5; the lubricating oil flows through the lubricating oil heater 6, the one-way valve 7 and the three-way valve 9, wherein when the lubricating oil temperature is low, the lubricating oil heater 6 is started to ensure that the lubricating oil temperature is always within a moderate temperature range, and the one-way valve 7 can ensure the retention of lubricating oil in the pipeline to avoid air disturbance causing lubricating oil flow fluctuation. The lubricating oil is filtered again through the lubricating oil fine filter 10, and the lubricating oil temperature is kept within a reasonable range through the combination of the thermostatic valve 16 and the lubricating oil cooler 14, and the lubricating oil is divided into two paths and supplied to the front and rear bearings 13 of the generator 2 through the flow switch 11, wherein the flow switch can effectively monitor the lubricating oil flow, and when the oil supply is abnormal, an alarm signal is sent out, and the generator set is stopped through the control box, thereby effectively protecting the generator bearing. The lubricating oil is returned to the integrated lubricating oil tank 4 by gravity after being supplied to the front and rear bearings of the generator.

[0026] In summary, the above technical scheme realizes the following technical effects: (1) The generator lubricating oil tank is integrated on the integrated common base, without separately occupying cabin space, which significantly reduces the cabin layout difficulty, improves the space utilization rate, and solves the space occupation problem caused by the independent setting of the lubricating oil tank in the prior art.

[0027] (2) The oil tank is arranged close to the generator, which shortens the length of the oil inlet pipeline, reduces the number of pipeline joints, reduces the risk of oil leakage and energy loss, and solves the defects of complex pipeline and high loss in the existing technology.

[0028] (3) The double-sided oil return structure is adopted and the oil returns by gravity. No additional power equipment is required. The oil can still return stably under the conditions of ship tilting angle or swaying, which greatly improves the reliability of oil return and solves the problems of oil return dependence on power and poor adaptability in the existing technology.

[0029] (4) By combining the three-way valve with interface J1, the "one-stop dual-use" of lubricating oil filling and waste oil extraction is realized, which reduces the number of system interfaces, saves system resources, and solves the problem that lubricating oil replenishment and discharge require separate interfaces in the existing technology.

[0030] (5) Through the coordinated control of the lubricating oil heater, thermostatic valve and lubricating oil cooler, the lubricating oil temperature is always kept within the appropriate range. Combined with the pressure equalization effect of the throttling orifice plate, the lubrication effect is improved and the service life of the generator bearing is extended.

Claims

1. An integrated generator self-lubricating system, characterized in that: It includes a diesel engine, generator, integrated common base, generator oil tank, oil coarse filter, oil heater, one-way valve, electric oil pump, three-way valve, oil fine filter, flow switch, and generator front and rear bearings; the generator oil tank is integrated on the integrated common base, without occupying separate compartment space; the generator front and rear bearings are respectively provided with oil return ports on both sides, and the oil return ports are directly connected to the generator oil tank through pipelines, forming a double-sided oil return structure.

2. The integrated generator self-lubricating system according to claim 1, characterized in that: The inlet of the electric lubricating oil pump is connected to the generator lubricating oil tank via a lubricating oil coarse filter, a lubricating oil heater, and a one-way valve, while the outlet is connected to a three-way valve. The three-way valve selectively connects to the lubricating oil fine filter and interface J1, which has both lubricating oil filling and waste oil extraction functions. The outlet of the lubricating oil fine filter is divided into two paths, which are connected to the oil inlets of the front and rear bearings of the generator via flow switches to achieve directional oil supply.

3. The integrated generator self-lubricating system according to claim 1, characterized in that: The distance between the generator oil tank and the generator shall not exceed 50cm, and the total length of the oil inlet pipeline shall not exceed 1.5 times the distance from the generator axis to the edge of the integrated common base, so as to shorten the pipeline path and reduce kinetic energy loss.

4. The integrated generator self-lubricating system according to claim 1, characterized in that: The oil return ports of the dual-sided oil return structure are symmetrically arranged along the axis of the generator bearing, and the oil return is achieved without power by gravity, which is suitable for ship tilting and rolling conditions.

5. The integrated generator self-lubricating system according to claim 1, characterized in that: The interface J1 is connected to the sludge tank and the lubricating oil supply source in the compartment through pipelines. The three-way valve is an electromagnetically controlled three-way valve, which switches the working position by the output signal of the control box to realize "one port for two uses" for lubricating oil supply and discharge.

6. The integrated generator self-lubricating system according to claim 1, characterized in that: The lubricating oil heater is connected in series between the lubricating oil coarse filter and the one-way valve. Its start-up threshold is set to automatically start when the lubricating oil temperature is below 20°C and stop when the temperature reaches 30°C-40°C, ensuring the fluidity of the lubricating oil in low-temperature environments.

7. The integrated generator self-lubricating system according to claim 1, characterized in that: It also includes an oil cooler, a thermostatic valve, and a temperature sensor. The temperature sensor is located at the oil outlet of the lubricating oil filter. The oil cooler and the thermostatic valve are connected in series between the lubricating oil filter and the flow switch. The control box adjusts the opening of the thermostatic valve according to the temperature sensor signal to stabilize the lubricating oil temperature within the lubrication adaptation range of 40℃-60℃.

8. The integrated generator self-lubricating system according to claim 1, characterized in that: The flow switch is electrically connected to the control box. The preset lubricating oil flow threshold is 5L / min-8L / min. When the flow rate is detected to be lower than the threshold, the control box will simultaneously issue an alarm signal and execute interlock control. If the generator has not started, starting will be prohibited. If it has already started, the pneumatic lubricating oil pump will be started or the diesel engine will be stopped.

9. The integrated generator self-lubricating system according to claim 1, characterized in that: Both the front and rear bearings of the generator are equipped with flow-stopping plates on their oil inlet pipes to balance the oil supply pressure of the front and rear bearings and avoid local over- or under-supply of oil.

10. The integrated generator self-lubricating system according to claim 1, characterized in that: The generator oil tank is equipped with an oil level sensor, which is electrically connected to the control box. When the oil level is detected to be lower than the preset lower limit or higher than the preset upper limit, the control box issues an oil level abnormality alarm signal to remind the operator to replenish or drain the oil.

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