Diesel engine sliding bearing temperature monitoring and protecting device

Abstract

The invention relates to a diesel engine sliding bearing temperature monitoring and protecting device which is used for monitoring the temperature of a diesel engine sliding bearing in real time and automatically adjusting the lubricating oil cooling amount when the bearing is overheated so as to ensure normal operation of a diesel engine. The device comprises at least three machine belt pumps which are fixed on a customized metal frame through flanges and are meshed with pinions; lubricating oil is supplied to a machine belt pump through an inlet pipe, is limited by a flow control valve, and is distributed to all bearings and chain wheels through pipelines for lubricating and cooling. Meanwhile, the hydraulic oil output pipe conveys the boosted hydraulic oil to a diesel engine hydraulic oil common rail pipe for driving a fuel injection valve and an exhaust valve of the diesel engine; and at least three embedded bearing temperature sensors are also arranged, are respectively arranged at the bearing of the pinion, and are used for monitoring the temperature of the bearing in real time. The device has the advantages of being compact in structure, accurate in monitoring, rapid in response and the like, faults caused by bearing overheating can be effectively prevented, the reliability of a diesel engine is improved, and the service life is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engine manufacturing, and in particular relates to a diesel engine sliding bearing temperature monitoring and protection device, which is particularly used for a hydraulic oil engine belt pump installed on a low-speed ship engine. Background Art

[0002] In order to actively respond to the challenges of ship pollution emissions, especially the strict restrictions on diesel engine exhaust emissions, China's shipbuilding industry has effectively met the Tier III emission standards of the International Maritime Organization (IMO) through independent technological innovation and independent research and development of exhaust gas treatment devices such as selective catalytic reduction systems. At the same time, the diesel engine fuel injection method has been changed by upgrading technology, abandoning the traditional fuel injection mode of sprocket-driven camshafts and then driving fuel booster pumps, and instead using hydraulic oil to directly drive the fuel injection system, and realizing single-cylinder multiple oil heads sequentially controlled injection through solenoid valves, thereby achieving precise control.

[0003] In terms of high-end diesel engine technology, internationally renowned companies such as MAN and WinGD all use 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 the stable operation of the diesel engine, it is necessary to maintain a hydraulic oil pressure of 200 to 300 bar. Before starting the diesel engine, MAN and other companies use an electronic pump to establish the required hydraulic oil pressure. Once the main engine is running, they switch to the engine pump to continuously supply hydraulic oil and maintain the hydraulic oil pressure at around 300 bar. Therefore, the working state of the engine pump directly affects the operation of the diesel engine, especially when the main engine consumes more hydraulic oil during high-load operation. In order to ensure the common rail hydraulic oil pressure, the engine pump needs to run at full load. However, when the engine pump runs at full load, the bearing load will increase. In order to prevent dry grinding, it is necessary to pay attention to the temperature, lubrication and other parameters of the bearing. Because the internal environment of the gearbox is complex during the operation of the diesel engine, it is not convenient to observe and repair. When the bearing temperature continues to rise, the bearing service life will be reduced. In extreme cases, it may be necessary to stop and cool down for inspection. However, for ships sailing at sea, especially in busy waterway areas, the shutdown of diesel engines will directly affect the navigation safety of the ships.

[0004] Therefore, how to ensure efficient and stable operation of the diesel engine while effectively monitoring and managing the working status of the engine belt pump and its bearings to avoid potential safety risks caused by excessive bearing temperature has become a key issue that needs to be urgently solved in the current field of diesel engine technology. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a diesel engine sliding bearing temperature monitoring and protection device, which monitors the temperature of the diesel engine sliding bearing and automatically increases the amount of lubricating oil cooling when the bearing is overheated to reduce the bearing temperature and ensure 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, which is characterized by comprising:

[0008] A plurality of machine-driven pumps (1) are fixed to the metal frame through corresponding flanges (2) and are respectively meshed with corresponding pinions (3);

[0009] A coaxial rotating structure, comprising a plurality of large gears (4) and sprockets (5), each large gear (4) being respectively meshed with each small gear (3), wherein the sprockets (5) are driven by a diesel engine crankshaft chain;

[0010] A lubricating oil inlet pipe (6), used for supplying lubricating oil to the belt pump (1);

[0011] A 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 pipeline (8) for lubrication and cooling;

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

[0013] At least three embedded bearing temperature sensors (10), respectively installed at the bearings of the pinion (3) for real-time monitoring of the bearing temperature;

[0014] A signal acquisition module (11), used for acquiring a temperature signal output by the bearing temperature sensor (10);

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

[0016] The monitoring system (14) is used to receive the alarm signal sent by the host control system (12) and notify the operator to perform corresponding processing.

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

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

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

[0020] An alarm module, which sends an alarm signal to a monitoring system (14) when the bearing temperature continues to rise to a preset alarm temperature threshold;

[0021] The prompt module reminds the operator to pay attention to the bearing temperature through display or sound and light when increasing the amount of lubricating oil supplied to the bearing, and to make preparations for inspection in advance.

[0022] Furthermore, the flow control valve is a solenoid valve or an electric valve with adjustable opening.

[0023] Furthermore, the monitoring system (14) comprises a display device and / or an audible and visual alarm device for visually displaying alarm information to an operator.

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

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

[0026] It can ensure that the diesel engine can maintain normal operation under harsh working conditions, thereby improving the reliability and service life of the diesel engine.

[0027] Intelligent management and monitoring of diesel engine sliding bearing temperature are achieved through integrated control systems and sensor technology. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0032] See also Figure 1 and Figure 2 , Figure 11 is a schematic diagram of the structure of an embodiment of a diesel engine sliding bearing temperature monitoring and protection device according to the present invention. Figure 2 It is a side view of an embodiment of a diesel engine sliding bearing temperature monitoring and protection device of the present invention. As shown in the figure, a diesel engine sliding bearing temperature monitoring and protection device comprises: three engine belt pumps 1 are fixed on a customized metal frame through flange 2 and meshed with pinion 3, large gear 4 and sprocket 5 rotate coaxially and meshed with three pinion 3, sprocket 5 rotates through the diesel engine crankshaft chain. Pipe 6 is the lubricating oil inlet, which supplies lubricating oil to the three engine belt pumps 1, and at the same time, through the flow proportional control valve 7, the flow control valve 7, after limiting the flow, through pipe 8 to supply oil to each bearing and sprocket, which plays a role in lubrication and cooling. Pipe 9 is the hydraulic oil output pipe after the engine belt pump 1 is boosted, which is connected to the diesel engine hydraulic oil common rail pipe and is used to drive the diesel engine fuel injection valve and exhaust valve. Temperature sensor 10 monitors the bearing temperature of pinion 3.

[0033] When the diesel engine is running, the main lubricating oil inlet temperature 15 and 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 range. The signal acquisition module 11 collects and processes the sensor signals and communicates them to the main engine control system 12. During normal operation, the flow control valve 7 is in the initial setting position. When the bearing temperature sensor 10 detects that the temperature rises, the main engine 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. 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 main engine control system 12 sends an alarm signal to the monitoring system 14 to notify the crew to find a suitable place to stop the engine for inspection, reduce the risk of emergency stop of the diesel engine, and remind the crew to pay attention to the bearing temperature when increasing the oil supply, and make preparations for inspection in advance.

[0034] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. A diesel engine sliding bearing temperature monitoring and protection device, characterized in that: include: A plurality of machine-driven pumps (1) are fixed to the metal frame through corresponding flanges (2) and are respectively meshed with corresponding pinions (3); A coaxial rotating structure, comprising a plurality of large gears (4) and sprockets (5), each large gear (4) being respectively meshed with each small gear (3), wherein the sprockets (5) are driven by a diesel engine crankshaft chain; A lubricating oil inlet pipe (6), used for supplying lubricating oil to the belt pump (1); A 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 pipeline (8) for lubrication and cooling; A hydraulic oil output pipe (9) is connected to the boost output end of the engine-driven pump (1) and is used to deliver the boosted hydraulic oil to the diesel engine hydraulic oil common rail pipe to drive the fuel injection valve and exhaust valve of the diesel engine; At least three embedded bearing temperature sensors (10), respectively installed at the bearings of the pinion (3) for real-time monitoring of the bearing temperature; A signal acquisition module (11), used for acquiring a temperature signal output by the bearing temperature sensor (10); A host control system (12) receives the signal transmitted by the signal acquisition module (11), determines whether the bearing temperature is abnormal according to a preset temperature threshold, and sends a control signal to the flow control valve (7); The monitoring system (14) is used to receive the alarm signal sent by the host control system (12) and notify the operator to perform corresponding processing.

2. The diesel engine sliding bearing temperature monitoring and protection device according to claim 1 is characterized in that: Also includes: A main lubricating oil inlet temperature monitoring device (15) is used to monitor the temperature of the lubricating oil entering the system; The main lubricating oil inlet pressure monitoring device (16) is used to monitor the lubricating oil pressure entering the system to ensure the normality of the lubricating oil supply.

3. The diesel engine sliding bearing temperature monitoring and protection device according to claim 1 or 2, characterized in that: The host control system (12) further includes: An alarm module, which sends an alarm signal to a monitoring system (14) when the bearing temperature continues to rise to a preset alarm temperature threshold; The prompt module reminds the operator to pay attention to the bearing temperature through display or sound and light when increasing the amount of lubricating oil supplied to the bearing, and to make preparations for inspection in advance.

4. The diesel engine sliding bearing temperature monitoring and protection device according to claim 1 is characterized in that: The flow control valve is a solenoid valve or an electric valve with adjustable opening.

5. The diesel engine sliding bearing temperature monitoring and protection device according to claim 1 is characterized in that: The monitoring system (14) comprises a display device and / or an audible and visual alarm device, which is used to visually display alarm information to an operator.

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