Rapid cooling and lubricating protection system and method after emergency shutdown of diesel engine

Abstract

The invention discloses a rapid cooling and lubricating protection system and method after emergency shutdown of a diesel engine. The rapid cooling and lubricating protection system comprises a monitoring device, a forced water circulation device, a turning gear and an engine oil pre-supply device. The monitoring device is in bidirectional connection with the forced water circulation device, the turning gear and the engine oil pre-supply device, and the monitoring device comprises a manual forced water circulation button, a manual engine oil pre-supply button and a manual turning button. The diesel engine is rapidly cooled and lubricated, damage to a diesel engine body caused by local high temperature and unsmooth lubrication of the diesel engine is avoided, and the use safety is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of diesel engine control, and in particular to a system and method for quickly cooling and lubricating a diesel engine after emergency shutdown. Background Art

[0002] After the diesel engine runs at high load, it needs to be cooled at high speed without load before it can be shut down. If a fault occurs during high load operation and causes an emergency shutdown, the high temperature gas in the diesel engine cylinder cannot be discharged, the local temperature is too high, and the cooling water and oil circulation are not smooth, causing the diesel engine moving parts to stick together, which in turn leads to the occurrence of diesel engine failure. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a system and method for rapid cooling and lubrication protection of a diesel engine after emergency shutdown, which can quickly cool and lubricate the diesel engine after emergency shutdown, avoiding damage to the diesel engine body caused by local high temperature and poor lubrication of the diesel engine, and can effectively solve the problems in the background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: a rapid cooling and lubrication protection system for a diesel engine after emergency shutdown, comprising a monitoring device, a forced water circulation device, a turning device and an oil pre-supply device;

[0005] The monitoring device is electrically connected to the forced water circulation device, the turning device and the oil pre-supply device respectively.

[0006] As a preferred technical solution of the present invention, the monitoring device includes a manual forced water circulation button, a manual oil pre-supply button and a manual cranking button.

[0007] A protection method for a diesel engine rapid cooling lubrication protection system after emergency shutdown, comprising the following steps:

[0008] S1: Determine whether the diesel engine is in a shutdown state. If the diesel engine is in a shutdown state, enter step S2:

[0009] S2: judging whether the engine is in a high temperature state. If the engine is in a high temperature state, the monitoring device starts the forced water circulation device, the oil pre-supply device and the cranking device respectively. After a certain period of time, the forced water circulation device, the oil pre-supply device and the cranking device are stopped.

[0010] If the engine is in a low temperature state, the monitoring device will only start the forced water circulation device and the oil pre-supply device.

[0011] As a preferred technical solution of the present invention, the shutdown condition of the diesel engine in step S1 is: when the monitoring device detects that the diesel engine speed drops from greater than the successful operation speed setting value R1 to 0 speed, the monitoring device determines that the diesel engine changes from the running state to the shutdown state.

[0012] As a preferred technical solution of the present invention, in step S2, the judgment condition that the engine is at a high temperature is: the monitoring device detects the cooling water temperature and compares it with the cooling water temperature limit T1, the monitoring device detects the engine oil temperature and compares it with the engine oil temperature limit T2, when the cooling water temperature is greater than or equal to the cooling water temperature limit T1 or the engine oil temperature is greater than or equal to the engine oil temperature limit T2, the engine is in a high temperature state;

[0013] The judgment condition that the engine is in a low temperature is: when the cooling water temperature is less than the cooling water temperature limit T1 and the engine oil temperature is less than the engine oil temperature limit T2, the engine is in a low temperature state.

[0014] As a preferred technical solution of the present invention, in step S2, when the working time of the forced water circulation device reaches the forced water circulation set time t1, the monitoring device stops the forced water circulation device.

[0015] As a preferred technical solution of the present invention, in step S2, when the working time of the oil pre-supply device reaches the oil pre-supply set time t2, the monitoring device stops the oil pre-supply device.

[0016] As a preferred technical solution of the present invention, in step S2, when the cranking time reaches the cranking setting time t3, the monitoring device stops the cranking device.

[0017] As a preferred technical solution of the present invention, when the cranking device stops, if the cooling water temperature or the engine oil temperature is too high, the monitoring device will issue a diesel engine high temperature alarm and the engine high temperature alarm light will light up.

[0018] As a preferred technical solution of the present invention, the judgment condition that the cooling water temperature or the engine oil temperature is too high is: the monitoring device detects the cooling water temperature and compares it with the cooling water temperature limit T1, and the monitoring device detects the engine oil temperature and compares it with the engine oil temperature limit T2. When the cooling water temperature is greater than or equal to the cooling water temperature limit T1 or the engine oil temperature is greater than or equal to the engine oil temperature limit T2, the monitoring device issues a diesel engine high temperature alarm.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: after the diesel engine is shut down in an emergency, the system and method for rapid cooling and lubrication protection of the diesel engine can quickly discharge the high-temperature gas in the cylinder by turning the gear, accelerate the cooling water circulation and the oil circulation, accelerate the cooling water circulation by forced water circulation, and accelerate the oil circulation by oil pre-supply, thereby avoiding local high temperature of the oil and achieving the purpose of protecting the diesel engine body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a system schematic diagram of the present invention.

[0021] In the figure: 1 monitoring device, 2 forced water circulation device, 3 turning device, 4 oil pre-supply device. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1 , the present invention provides a technical solution: a diesel engine rapid cooling and lubrication protection system after emergency shutdown, comprising a monitoring device 1, a forced water circulation device 2, a turning device 3 and an oil pre-supply device 4;

[0024] The monitoring device is electrically connected to the forced water circulation device 2, the cranking device 3 and the oil pre-supply device 4 respectively.

[0025] The monitoring device 1 can detect the diesel engine speed, cooling water temperature, and oil temperature. The monitoring device 1 can preset the cooling water temperature limit T1, the oil temperature limit T2, the successful operation speed setting value R1, the forced water circulation setting time t1, the oil pre-supply setting time t2, and the cranking setting time t3.

[0026] A rapid cooling and lubrication protection method for a diesel engine after emergency shutdown includes the following steps:

[0027] S1: The monitoring device 1 measures the speed of the diesel engine in real time. When the monitoring device 1 detects that the speed of the diesel engine drops from a speed greater than the set value R1 of the successful operation speed to 0 speed, the monitoring device 1 determines that the diesel engine changes from the running state to the shutdown state:

[0028] S2: When the diesel engine shutdown event occurs, it is determined whether the engine is in a high temperature state. If the engine is in a high temperature state, the monitoring device 1 starts the forced water circulation device 2, the oil pre-supply device 4 and the cranking device 3 respectively. After a certain period of time, the forced water circulation device 2, the oil pre-supply device 4 and the cranking device 3 are stopped;

[0029] If the engine is in a low temperature state, the monitoring device 1 only starts the forced water circulation device 2 and the oil pre-supply device 4;

[0030] The judgment condition that the engine is at high temperature is as follows: the monitoring device 1 detects the cooling water temperature and compares it with the cooling water temperature limit T1, the monitoring device 1 detects the engine oil temperature and compares it with the engine oil temperature limit T2, when the cooling water temperature is greater than or equal to the cooling water temperature limit T1 or the engine oil temperature is greater than or equal to the engine oil temperature limit T2, the engine is at high temperature;

[0031] The judgment condition that the engine is in a low temperature is: when the cooling water temperature is less than the cooling water temperature limit T1 and the engine oil temperature is less than the engine oil temperature limit T2, the engine is in a low temperature state.

[0032] The monitoring device 1 starts the forced water circulation device 2. After the working time reaches the forced water circulation setting time t1, the monitoring device 1 stops the forced water circulation device 2.

[0033] The monitoring device 1 starts the engine oil pre-supply device 4. After the working time reaches the engine oil pre-supply setting time t2, the monitoring device 1 stops the engine oil pre-supply device 4.

[0034] The monitoring device 1 starts the cranking device 3 to start cranking. After the cranking time reaches the cranking setting time t3, the monitoring system 1 stops the cranking device 3.

[0035] After stopping the cranking device 4, the monitoring device 1 detects the cooling water temperature and compares it with the cooling water temperature limit T1. The monitoring device 1 detects the engine oil temperature and compares it with the engine oil temperature limit T2. When the cooling water temperature is greater than or equal to the cooling water temperature limit T1 or the engine oil temperature is greater than or equal to the engine oil temperature limit T2, the monitoring device 1 issues a diesel engine high temperature alarm and the engine high temperature alarm light comes on.

[0036] In order to prevent the diesel engine from being unable to be quickly cooled and lubricated after a failure of the monitoring device 1 , the monitoring device 1 includes a manual forced water circulation button, a manual oil pre-supply button and a manual cranking button.

[0037] When the engine high temperature alarm occurs, the operator can manually force water circulation by pressing the forced water circulation button, and the forced water circulation will stop after reaching the set time t1;

[0038] When the engine high temperature alarm sounds, the operator can use the manual oil pre-supply button to pre-supply the oil manually, and the pre-supply will stop after the working oil pre-supply setting time t2 is reached;

[0039] When the engine high temperature alarm sounds, the operator can manually crank the engine using the manual cranking button and stop after the cranking setting time t3 is reached.

[0040] In addition, in order to facilitate the installation and operation of the monitoring device 1, the monitoring device 1 can be an independent device, or can be integrated with a diesel engine control box or a diesel engine ECU.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A rapid cooling and lubrication protection system for a diesel engine after emergency shutdown, characterized in that: It comprises a monitoring device (1), a forced water circulation device (2), a turning device (3) and an oil pre-supply device (4); The monitoring device is electrically connected to the forced water circulation device (2), the turning device (3) and the engine oil pre-supply device (4) respectively.

2. A diesel engine rapid cooling and lubrication protection system after emergency shutdown according to claim 1, characterized in that: The monitoring device (1) comprises a manual forced water circulation button, a manual oil pre-supply button and a manual cranking button.

3. The protection method of a diesel engine rapid cooling and lubrication protection system after emergency shutdown according to claim 1, characterized in that: The steps include: S1: Determine whether the diesel engine is in a shutdown state. If the diesel engine is in a shutdown state, enter step S2: S2: judging whether the engine is in a high temperature state. If the engine is in a high temperature state, the monitoring device (1) starts the forced water circulation device (2), the engine oil pre-supply device (4) and the cranking device (3) respectively. After starting for a certain period of time, the forced water circulation device (2), the engine oil pre-supply device (4) and the cranking device (3) are stopped. If the engine is in a low temperature state, the monitoring device (1) only starts the forced water circulation device (2) and the engine oil pre-supply device (4).

4. A method for rapid cooling and lubrication protection of a diesel engine after emergency shutdown according to claim 3, characterized in that: The shutdown condition of the diesel engine in step S1 is as follows: when the monitoring device (1) detects that the speed of the diesel engine drops from a speed greater than the set value R1 for successful operation to 0 speed, the monitoring device (1) determines that the diesel engine changes from the running state to the shutdown state.

5. The method for rapid cooling and lubrication protection of a diesel engine after emergency shutdown according to claim 3, characterized in that: In step S2, the judgment condition that the engine is at a high temperature is: the monitoring device (1) detects the cooling water temperature and compares it with the cooling water temperature limit T1, the monitoring device (1) detects the engine oil temperature and compares it with the engine oil temperature limit T2, when the cooling water temperature is greater than or equal to the cooling water temperature limit T1 or the engine oil temperature is greater than or equal to the engine oil temperature limit T2, the engine is in a high temperature state; The judgment condition that the engine is in a low temperature is: when the cooling water temperature is less than the cooling water temperature limit T1 and the engine oil temperature is less than the engine oil temperature limit T2, the engine is in a low temperature state.

6. The method for rapid cooling and lubrication protection of a diesel engine after emergency shutdown according to claim 3, characterized in that: In the step S2, when the working time of the forced water circulation device (2) reaches the forced water circulation setting time t1, the monitoring device (1) stops the forced water circulation device (2).

7. A method for rapid cooling and lubrication protection of a diesel engine after emergency shutdown according to claim 3, characterized in that: In the step S2, when the working time of the engine oil pre-supply device (4) reaches the engine oil pre-supply set time t2, the monitoring device (1) stops the engine oil pre-supply device (4).

8. The method for rapid cooling and lubrication protection of a diesel engine after emergency shutdown according to claim 3, characterized in that: In the step S2, when the cranking time reaches the cranking setting time t3, the monitoring device (1) stops the cranking device (3).

9. A method for rapid cooling and lubrication protection of a diesel engine after emergency shutdown according to claim 8, characterized in that: When the cranking device (3) stops, if the cooling water temperature or the engine oil temperature is too high, the monitoring device (1) issues a diesel engine high temperature alarm, and the engine high temperature alarm light is lit.

10. A diesel engine rapid cooling and lubrication protection method after emergency shutdown according to claim 9, characterized in that: The conditions for determining whether the cooling water temperature or the engine oil temperature is too high are as follows: the monitoring device (1) detects the cooling water temperature and compares it with the cooling water temperature limit T1; the monitoring device (1) detects the engine oil temperature and compares it with the engine oil temperature limit T2; when the cooling water temperature is greater than or equal to the cooling water temperature limit T1 or the engine oil temperature is greater than or equal to the engine oil temperature limit T2, the monitoring device (1) issues a diesel engine high temperature alarm.

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