A diesel engine sliding bearing temperature monitoring and protection device

Abstract

The present application relates to a kind of diesel engine sliding bearing temperature monitoring and protection device, for real-time monitoring the temperature of diesel engine sliding bearing, and when bearing overheating, automatically adjust the amount of oil cooling, to ensure the normal operation of diesel engine.The device includes at least three machine belt pumps, fixed to custom metal frame by flange, and engaged with pinion;Lubricating oil is supplied to machine belt pump through inlet pipe, after flow control valve flow limiting, through pipeline distribution to each bearing and sprocket for lubrication and cooling.At the same time, hydraulic oil output pipe delivers the hydraulic oil after pressure boost to diesel engine hydraulic oil common rail pipe, for driving diesel engine fuel injection valve and exhaust valve;Also provided with at least three embedded bearing temperature sensors, respectively installed at the bearing of pinion, real-time monitoring bearing temperature.The present application has the advantages of compact structure, monitoring accuracy, rapid response, etc., can effectively prevent the failure caused by bearing overheating, improve the reliability and service life of diesel engine.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of diesel engine manufacturing, and particularly relates to a diesel engine sliding bearing temperature monitoring and protection device, especially a hydraulic pump for a low-speed engine on a ship. BACKGROUND

[0002] To actively respond to the challenge of ship pollution emission, especially the strict limitation of diesel engine exhaust emission, the Chinese shipbuilding industry has effectively met the Tier III emission standard of the International Maritime Organization (IMO) through independent technological innovation and the selection of exhaust treatment devices such as selective catalytic reduction systems through independent research and development. At the same time, through the upgrading of technology to change the fuel injection mode of the diesel engine, the traditional fuel injection mode of chain wheel driving camshaft to drive the fuel booster pump is abandoned, and a hydraulic oil direct drive fuel injection system is adopted, and the sequential control injection of multiple oil heads of a single cylinder is realized through the electromagnetic valve, so as to realize accurate control.

[0003] In the field of high-end diesel engine technology, internationally renowned enterprises such as MAN and WinGD all adopt hydraulic oil common rail technology, in which the hydraulic oil pressure in the common rail reaches 300 bar to drive the fuel injection valve and exhaust valve of the diesel engine. To ensure stable operation of the diesel engine, the hydraulic oil pressure needs to be continuously maintained at 200 to 300 bar. Before the diesel engine starts, the required hydraulic oil pressure is established by an electronic pump, and once the main engine is running, it is switched to a machine-mounted pump to continuously supply hydraulic oil and maintain the hydraulic oil pressure at about 300 bar. Therefore, the working state of the machine-mounted pump directly affects the operation of the diesel engine, especially when the main engine consumes more hydraulic oil under high load, in order to ensure the common rail hydraulic oil pressure, the machine-mounted pump needs to run at full load. However, when the machine-mounted pump runs at full load, the bearing load will increase, and in order to prevent dry grinding, the temperature, lubrication and other parameters of the bearing need to be monitored at all times. Since the diesel engine has a complex internal environment during operation, it is not convenient to observe and maintain, and when the bearing temperature continues to rise, the service life of the bearing will be reduced, and in extreme cases, it may need to be stopped for cooling inspection. However, for ships sailing at sea, especially in busy waterways, the shutdown of the diesel engine will directly affect the safety of ship navigation.

[0004] Therefore, how to effectively monitor and manage the working state of the machine-mounted pump and its bearing while ensuring efficient and stable operation of the diesel engine, and avoid potential safety risks caused by excessive bearing temperature, has become a key problem to be solved in the current diesel engine technology field. SUMMARY

[0005] To address the shortcomings of the prior art, this invention provides a diesel engine sliding bearing temperature monitoring and protection device that monitors the temperature of the diesel engine sliding bearing and automatically increases the amount of lubricating oil for cooling when the bearing overheats, thereby reducing the bearing temperature and ensuring the normal operation of the diesel engine.

[0006] The technical solution of the present invention is as follows:

[0007] A diesel engine sliding bearing temperature monitoring and protection device, characterized in that it includes:

[0008] Multiple pumps (1) are fixed to the metal frame via corresponding flanges (2) and each meshes with a corresponding pinion (3);

[0009] The coaxial rotating structure consists of multiple large gears (4) and sprockets (5), each large gear (4) meshing with each small gear (3), wherein the sprockets (5) are driven by the diesel engine crankshaft chain;

[0010] The lubricating oil inlet pipe (6) is used to supply lubricating oil to the machine-driven pump (1);

[0011] The flow control valve (7) is connected to the end of the lubricating oil inlet pipe (6) and is used to adjust the valve opening according to the control signal of the host control system (12), thereby adjusting the amount of lubricating oil supplied to the bearing and distributing the lubricating oil to each bearing and sprocket through the pipe (8) for lubrication and cooling.

[0012] Hydraulic oil output pipe (9) is connected to the boost output end of the motor-driven pump (1) to deliver the boosted hydraulic oil to the common rail of the diesel engine to drive the fuel injection valve and exhaust valve of the diesel engine.

[0013] At least three embedded bearing temperature sensors (10) are installed at the bearing of the pinion (3) to monitor the bearing temperature in real time;

[0014] The signal acquisition module (11) is used to acquire the temperature signal output by the bearing temperature sensor (10);

[0015] The host control system (12) receives the signal transmitted by the signal acquisition module (11), and determines whether the bearing temperature is abnormal according to the preset temperature threshold, and sends a control signal to the flow control valve (7);

[0016] The monitoring system (14) is used to receive alarm signals from the host control system (12) and notify the operator to take appropriate action.

[0017] Furthermore, it also includes: a main lubricating oil inlet temperature monitoring device (15), used to monitor the lubricating oil temperature entering the system;

[0018] A main oil inlet pressure monitoring device (16) is used to monitor the oil pressure entering the system and ensure the normality of oil supply.

[0019] Further, the host control system (12) further comprises:

[0020] An alarm module sends an alarm signal to the monitoring system (14) when the bearing temperature continuously rises to a preset alarm temperature threshold.

[0021] A prompt module reminds the operator to pay attention to the bearing temperature and prepares for inspection in advance by displaying or acousto-optic means when increasing the amount of oil supplied to the bearing.

[0022] Further, the flow control valve is an electromagnetic valve or an electric valve with adjustable opening degree.

[0023] Further, the monitoring system (14) comprises a display device and / or an acousto-optic alarm device for directly displaying alarm information to the operator.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] By monitoring the bearing temperature in real time and automatically increasing the oil cooling amount when the temperature is too high, the risk of bearing overheating failure is effectively reduced.

[0026] The diesel engine can still maintain normal operation under harsh working conditions, improving the reliability and service life of the diesel engine.

[0027] Through integrated control system and sensor technology, intelligent management and monitoring of the diesel engine sliding bearing temperature are realized. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic diagram of an embodiment of the diesel engine sliding bearing temperature monitoring and protection device of the present application;

[0029] Figure 2 is a side view of an embodiment of the diesel engine sliding bearing temperature monitoring and protection device of the present application;

[0030] Figure 3 is a signal processing schematic diagram of the present application. DETAILED DESCRIPTION

[0031] The present application will be further described below in conjunction with the drawings and embodiments. The features of the present application will be illustrated and described by the following embodiments, which are given only as examples with reference to the accompanying drawings.

[0032] Please refer to Figure 1 and Figure 2 , Figure 1is the structural schematic view of the diesel engine sliding bearing temperature monitoring and protection device embodiment of the present application, Figure 2 is the side view of the diesel engine sliding bearing temperature monitoring and protection device embodiment of the present application, as shown in the figure, a diesel engine sliding bearing temperature monitoring and protection device comprises: three machine belt pumps 1 are fixed on a customized metal frame through flanges 2 and are engaged with pinions 3, a large gear 4 and a chain wheel 5 rotate coaxially and are engaged with the three pinions 3, and the chain wheel 5 is rotated through the diesel engine crankshaft chain. The pipe 6 is the lubricating oil inlet, which supplies lubricating oil to the three machine belt pumps 1, and simultaneously supplies oil to each bearing and chain wheel through the flow proportional control valve 7 after flow limiting, thereby playing a lubricating and cooling role. The pipe 9 is the hydraulic oil output pipe after the pressure of the machine belt pump 1 is raised, which is connected to the diesel engine hydraulic oil common rail pipe and is used for driving the diesel engine fuel injection valve and exhaust valve. The temperature sensor 10 monitors the bearing temperature of the pinion 3.

[0033] When the diesel engine is running, the main lubricating oil inlet temperature 15 and the inlet pressure 16 monitor whether the lubricating oil supply is normal, the three embedded bearing temperature sensors 10 monitor whether the small bearing temperature is within the normal value range, the signal acquisition module 11 acquires and processes the sensor signals well and communicates to the host control system 12. During normal operation, the flow control valve 7 is at the initial set position, when the bearing temperature sensor 10 monitors that the temperature rises, the host control system 12 sends a signal to increase the lubricating oil cooling amount to the flow control valve 7, the flow control valve 7 increases the valve opening degree, at this time, the bearing oil supply increases, after a period of time, if the temperature sensor 10 monitors that the temperature continues to rise, the host control system 12 sends an alarm signal to the monitoring system 14, informs the crew to stop the engine for inspection at a suitable place, reduces the risk of sudden stop of the diesel engine, and when the oil supply is increased, reminds the crew to pay attention to the bearing temperature, and prepares for inspection in advance.

[0034] In addition to the above embodiment, the present application patent can also have other implementation manners, and any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present application patent.

Claims

1. A diesel engine sliding bearing temperature monitoring and protection device, characterized in that, The application relates to a lubricating oil supply system for a diesel engine, comprising: a plurality of belt pumps (1) fixed on a metal frame through corresponding flanges (2) and meshing with corresponding pinion gears (3) respectively; a coaxial rotating structure composed of a plurality of gear wheels (4) and sprockets (5), wherein each gear wheel (4) is meshed with a pinion gear (3) respectively, and wherein the sprockets (5) are driven by a diesel engine crankshaft chain; a lubricating oil inlet pipe (6) for supplying lubricating oil to the belt pumps (1); a flow control valve (7) connected to the end of the lubricating oil inlet pipe (6) for adjusting the valve opening degree according to a control signal of a host control system (12) so as to adjust the lubricating oil amount supplied to bearings and distribute the lubricating oil to the bearings and sprockets through a pipe (8) for lubrication and cooling; a hydraulic oil outlet pipe (9) connected to the pressure boosting output end of the belt pump (1) for delivering the pressure-boosted hydraulic oil to a diesel engine hydraulic oil common rail pipe to drive fuel injection valves and exhaust valves of the diesel engine; at least three embedded bearing temperature sensors (10) installed at the bearings of the pinion gears (3) for monitoring the bearing temperature in real time; a signal acquisition module (11) for acquiring the temperature signals output by the bearing temperature sensors (10); the host control system (12) receives the signals transmitted by the signal acquisition module (11) and judges whether the bearing temperature is abnormal according to a preset temperature threshold value, and sends a control signal to the flow control valve (7); a monitoring system (14) for receiving an alarm signal sent by the host control system (12) and notifying an operator to take corresponding measures.

2. The diesel engine sliding bearing temperature monitoring and protection device of claim 1, wherein, Further comprising: a main lubricating oil inlet temperature monitoring device (15) for monitoring the lubricating oil temperature entering the system; a main lubricating oil inlet pressure monitoring device (16) for monitoring the lubricating oil pressure entering the system to ensure the normality of lubricating oil supply.

3. A diesel engine sliding bearing temperature monitoring and protection device according to claim 1 or 2, characterised in that, The host control system (12) further comprises: an alarm module for sending an alarm signal to the monitoring system (14) when the bearing temperature continuously rises to a preset alarm temperature threshold value; a prompt module for reminding the operator to pay attention to the bearing temperature and prepare for inspection in advance through display or sound-light mode when the lubricating oil amount supplied to the bearings is increased.

4. The diesel engine slide bearing temperature monitoring and protection device of claim 1, wherein, The flow control valve is an electromagnetic valve or an electric valve with adjustable opening degree.

5. The diesel engine slide bearing temperature monitoring and protection device of claim 1 wherein, The monitoring system (14) comprises a display device and / or a sound-light alarm device for directly displaying alarm information to the operator.

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