Multi-purpose oil pump sharing system and usage method

Abstract

The present invention discloses a multi-purpose oil pump sharing system and method of use. Multiple engines share two oil pumps, one for use and one for backup, achieving oil pump redundancy while reducing the number of engine-related pumps, their pipelines, and control devices. The control device is equipped with three self-resetting switches for lubricating oil pre-supply, waste oil discharge, and oil pan refueling, enabling switching and control of lubricating oil pre-supply, waste oil discharge, and oil pan refueling. The control device is equipped with a set of switches corresponding to each engine. Through the switch, the oil pump group can be used not only as a pre-supply pump for multiple engines, but also as a waste oil discharge pump and an oil pan refueling pump, thus achieving the multi-purpose use of the shared oil pump.

Description

Technical Field

[0001] The present invention relates to an oil pump and a use method thereof, and in particular to a multi-purpose oil pump sharing system and a use method thereof. Background Art

[0002] The purpose of engine oil pre-supply is to deliver clean lubricating oil to the friction surfaces during a cold start, forming an oil film on them to reduce mechanical wear. However, while lubricating the engine's friction surfaces, the lubricating oil also removes debris and impurities from them, resulting in a high concentration of impurities in the lubricating oil, some of which settle in the oil pan. Therefore, the lubricating oil needs to be regularly replaced. This is accomplished by pumping the lubricating oil from the engine's oil pan into a dirty oil tank using an oil pump. Refilling the oil pan after draining it, or when refilling the oil pan for the first time, takes a long time, especially on high-power engines, where the oil pan is larger. To refill the oil pan, use an oil pump to pump oil from a new tank into the oil pan.

[0003] To address these issues, each engine is typically equipped with a pre-supply oil pump to meet the engine's lubricating oil pre-supply needs. However, multiple engines often need to work together at the same site, and several pre-supply oil pumps are required for each engine. These pre-supply oil pumps only operate for a short period of time when the engine is stopped, or for a few minutes before starting the engine. This results in a high idle rate, which wastes resources. Furthermore, if a pump malfunctions, the corresponding engine's lubricating oil pre-supply function cannot be achieved. In emergency situations, the engine must be started without lubrication, which is very detrimental to the machine.

[0004] When cleaning and changing the lubricating oil of the engine, an oil pump and its oil extraction pipeline and control circuit are usually temporarily installed. After use, the oil pump, pipeline, control circuit, etc. are removed; when filling the oil pan with new oil, the oil pump inlet is connected to the oil outlet of the new oil tank, and the oil pump outlet is connected to the oil pan, and the oil pump is started to add oil to the oil pan. Although the oil cleaning and changing work is not frequent for a single engine, the total oil changing work for multiple engines is large. Temporary connection of pipelines and cables will also greatly occupy the working time of workers, causing the problem of long machine idle time. This method is time-consuming and increases the workload of workers. See the equipment piping diagram for details. Figure 1 (Dotted lines indicate temporary bridging pipes or cables).

[0005] In the industry, there is a setting that the pre-supply oil pump also serves as the dirty oil pump. The improved oil pump working design is shown in Figure 2 The advantage is that the pump efficiency is improved, but the pump and machine protection control device correspond to the unit one by one, the number of pumps is large, the equipment and lines increase, and the pump redundancy cannot be achieved. The reliability is low, and when the solenoid valve fails, there is a possibility that the pre-supply oil control solenoid valve and the sewage solenoid valve are opened at the same time. Summary of the Invention

[0006] The purpose of the present invention is to provide a multi-purpose oil pump sharing system and method of use, by which multiple engines share two oil pumps, with one oil pump in use and one in reserve, thereby realizing oil pump redundancy design while reducing the number of engine-matching pumps and their pipelines and control devices.

[0007] To achieve the above objectives, the present invention adopts a multi-purpose oil pump sharing system, comprising:

[0008] The redundant oil pump group includes a working oil pump and a backup oil pump; the redundant oil pump group is provided with an oil inlet pipe and an oil outlet pipe;

[0009] Multiple engines, each engine is connected to the oil outlet pipe of the redundant oil pump group through a corresponding oil circuit YFG, and an electromagnetic switch YGF is set on the oil circuit YFG corresponding to each engine;

[0010] Multiple oil pans, each with a high-level oil port and a low-level oil port. The high-level oil port is used for the lubricating oil pre-supply outlet and the oil pan refueling inlet, and the low-level oil port is used for the dirty oil discharge port. The high-level oil port is connected to the 1# port of the electric three-way valve via an oil pipe YFG, and the low-level oil port is connected to the 2# port of the electric three-way valve via an oil pipe. The 3# port of the electric three-way valve is connected to the oil outlet pipe of the oil pump group via an oil circuit JYG and to the oil inlet pipe of the oil pump group via an oil circuit YFG. A one-way valve NZFJ is provided on the oil circuit JYG, and a one-way valve NZFY is provided on the oil circuit YFG. The two check valves NZFJ and NZFY are in opposite directions. Each oil pan is also provided with a liquid level sensor.

[0011] The dirty oil tank is connected to the oil outlet pipe of the redundant oil pump group through an oil circuit WZG, and a solenoid valve WZF is provided on the oil circuit WZG;

[0012] The new oil tank is connected to the oil inlet pipe of the redundant oil pump group through the oil circuit JZG, and the oil circuit JZG is provided with a solenoid valve JYF;

[0013] a control device electrically connected to the liquid level sensor and provided with a switch electrically connected to all the solenoid valves;

[0014] Furthermore, the control device is provided with a manual-automatic conversion switch for controlling the system to be in automatic mode or manual mode.

[0015] Furthermore, in manual mode, the control device is provided with a lubricating oil pre-supply self-resetting switch, a dirty oil discharge self-resetting switch, and an oil pan refueling self-resetting switch corresponding to each engine; the switch is in a left and right self-resetting operation mode, with no operation in the middle position, and the left and right positions respectively corresponding to pump start and pump stop operation instructions. When the operation switch is rotated to the start position, the pump executes the start instruction, and when the operation switch is rotated to the stop position, the pump executes the stop instruction. When the pump is running during the execution of one instruction, other instructions are invalid unless the corresponding stop instruction is operated or the operation of this stage is stopped.

[0016] Furthermore, in automatic mode, the control device controls the pump group to pre-supply lubricating oil to the engines in the stopped state among the multiple engines in sequence, with an automatic operation frequency of T minutes per interval T1, wherein the automatic pre-supply function of the engines in the running state is automatically skipped.

[0017] Preferably, the control device further includes a status indication module and an alarm indication module.

[0018] Preferably, in the multi-purpose oil pump sharing system, the number of engines is 2-4.

[0019] The present invention also provides a method for using a multi-purpose oil pump sharing system. Using the system,

[0020] The control device is equipped with a manual / automatic transfer switch. The automatic state is only applicable to the lubricating oil pre-supply function. The dirty oil discharge and oil pan refueling only have manual control functions and the automatic pump stop function when the liquid level exceeds the limit. In manual mode, a set of self-resetting transfer switches is set for each engine. Each switch set includes a lubricating oil pre-supply control switch, a dirty oil discharge control switch and an oil pan refueling control switch.

[0021] In the automatic state, the control device enters the automatic lubricating oil pre-supply process, monitors whether the engine is in the stopped state, and automatically pre-supplies the lubricating oil to the stopped engine in sequence;

[0022] In manual mode, if the pump group is in a stopped state, when the control device monitors that there is a pre-supply instruction for the 1# engine, the control device sends an opening instruction for the oil pre-supply channel of the electric three-way valve STF1, and the 1#3# channels of STF1 are connected, and the oil pre-supply position in place signal is fed back to the control device. If the three-way valve in place signal is not received within a delay, the control device sends a three-way valve fault signal. If the control device receives the in place signal, it controls the main oil pump and the pre-supply solenoid valve YGF1 to operate, and the pre-supply oil is output from the oil port GGK of the oil pan through the oil pipe YFG10 and through the 1#3# channels of the three-way valve. , one-way valve NZF11, oil pipe YFG11 enters the oil inlet pipe of the pump group, the pump group refuels the lubricating oil through YGF1 and oil pipe YFG13 into the engine, during the operation of the oil pump, the oil pump fault relay detects the working condition of the oil pump, and at the same time the pressure sensor YLS1 detects the pre-supply oil pressure signal, if both are normal, the main oil pump continues to work, if any one of the signals is abnormal, the control device outputs the standby oil pump working instruction, the system automatically starts the standby oil pump, the oil pump stops automatically when the set time T is reached, or if the set time is not reached and there is a stop pre-supply signal, the oil pump will also stop automatically;

[0023] When the control device detects a command to discharge wastewater from the 1# engine, it issues a command to connect the wastewater oil pipeline of the electric three-way valve STF1. After a delay, it feeds back a wastewater oil position status signal after the 2# and 3# channels of STF1 are connected in place. If the three-way valve is not connected in place within the delay, the control device issues a three-way valve fault signal. After receiving the signal, the control device controls the oil pump and the wastewater solenoid valve WZF1 to operate. The oil pump fault relay detects the working condition of the oil pump. If there is no fault, the oil pump continues to operate. The wastewater oil is discharged from the DGK oil port of the oil pan through WFG1 and the 2# and 3# pipe ports of the three-way valve STF1, and enters the oil inlet pipe of the oil pump group through the one-way valve NZFY11. The wastewater oil is refueled by the oil pump and enters the waste oil tank through the oil pump output pipe, WZG1 oil pipe, and WZF1 solenoid valve. If there is any abnormality, the standby oil pump is automatically started. If there is no abnormality, the oil pump continues to operate. The oil pump stops when the control device receives a stop command or when the control device detects that the liquid level is below the limit.

[0024] When the control device detects a refueling command for the 1# engine oil pan, it issues a command to connect the refueling pipeline of the electric three-way valve STF1. After a delay, it feeds back a refueling position status signal to the control device after the 1# and 3# channels of STF1 are connected. If the three-way valve is not connected within the delay, the control device issues a three-way valve fault signal. If the control device receives the in-position signal, it controls the oil pump and the refueling solenoid valve JYF1 to operate. The oil pump fault relay detects the working condition of the oil pump. If there is no fault, the oil pump continues to operate. New oil is output from the new oil tank through JYF1 and JYG1 and enters the oil inlet pipeline of the oil pump group. The new oil is pressurized by the oil pump group and output from the oil outlet. It is output through the one-way valve NZF12 and the 1# and 3# pipe ports of the three-way valve STF1 and enters the oil pan through the refueling pipe JYG12. If there is any abnormality, the standby oil pump is automatically activated. If there is no abnormality, the oil pump continues to operate. When the control device receives a stop command, the oil pump stops operating, or when the control device detects that the liquid level is equal to or above the limit, it controls the oil pump to stop operating.

[0025] Furthermore, the control and protection device monitors the liquid level status in real time through the liquid level sensor. When the dirty oil discharge instruction is started, the pump group starts; when the dirty oil discharge stop instruction is received or the liquid level is monitored to be lower than the set value, the pump group stops running; similarly, when the oil pan refueling instruction is started, the pump group starts; when the refueling stop instruction is received or the liquid level is monitored to be greater than or equal to the set value, the pump group stops running.

[0026] In the present invention, multiple engines share two oil pumps, one for active use and one for backup, achieving oil pump redundancy while reducing the number of engine-related pumps, their piping, and control devices. The control device is equipped with three self-resetting switches for lubricating oil pre-supply, waste oil discharge, and oil pan refueling, enabling switching and control of lubricating oil pre-supply, waste oil discharge, and oil pan refueling. The control device is equipped with a set of switches corresponding to each engine. Through the switches, the oil pump group can be used not only as a pre-supply pump for multiple engines, but also as a waste oil discharge pump and an oil pan refueling pump, achieving the multi-purpose function of the shared oil pump. Compared with previous designs, the present invention's shared pump group redundant design has high reliability. A set of oil pumps, including one for active use and one for backup, can fulfill three purposes, resulting in high oil pump group utilization. Multiple units share a single oil pump, requiring fewer equipment such as oil pumps, piping, and control and protection devices. Pre-lubrication, waste oil discharge, and refueling for multiple engines are centrally controlled, requiring less piping and wiring, making operation simple and the oil pump group highly efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a traditional design principle diagram of the oil supply system in the existing technology;

[0028] Figure 2 This is a schematic diagram of the improved design of the oil supply system in the prior art;

[0029] Figure 3 It is a principle design diagram of an embodiment of the present invention;

[0030] Figure 4 It is a principle diagram of a method for using a multi-purpose oil pump sharing system of the present invention.

[0031] In the picture: DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below with reference to the accompanying drawings.

[0033] The present invention adopts a multi-purpose oil pump sharing system, combined with Figure 3 The embodiments provided include:

[0034] The redundant oil pump group includes a working oil pump and a backup oil pump; the redundant oil pump group is provided with an oil inlet pipe and an oil outlet pipe;

[0035] 3 engines, each engine is connected to the oil outlet pipe of the redundant oil pump group through a corresponding oil circuit YFG, and an electromagnetic switch YGF is provided on the oil circuit YFG corresponding to each engine;

[0036] There are three oil pans, each with a high-level oil port and a low-level oil port. The high-level oil port is used for the lubricating oil pre-supply outlet and the oil pan refueling inlet, and the low-level oil port is used for the dirty oil discharge port. The high-level oil port is connected to the 1# port of the electric three-way valve via the oil pipe YFG, and the low-level oil port is connected to the 2# port of the electric three-way valve via the oil pipe. The 3# port of the electric three-way valve is connected to the oil outlet pipe of the oil pump group via the oil circuit JYG and the oil inlet pipe of the oil pump group via the oil circuit YFG. A one-way valve NZFJ is installed on the oil circuit JYG, and a one-way valve NZFY is installed on the oil circuit YFG. The two check valves NZFJ and NZFY are in opposite directions. Each oil pan is also equipped with a liquid level sensor.

[0037] The dirty oil tank is connected to the oil outlet pipe of the redundant oil pump group through an oil circuit WZG, and a solenoid valve WZF is provided on the oil circuit WZG;

[0038] The new oil tank is connected to the oil inlet pipe of the redundant oil pump group through the oil circuit JZG, and the oil circuit JZG is provided with a solenoid valve JYF;

[0039] The control device is electrically connected to the liquid level sensor and has switches electrically connected to all solenoid valves. A manual-to-automatic transfer switch is provided on the control device, controlling the system between automatic and manual modes. The oil pump control and protection panel features manual / automatic transfer switches, an N# lubricating oil pre-supply switch, an N# dirty oil drain switch, an N# oil pan refueling switch, status indicators, and alarm indicators. It collects engine operating signals, oil pan level signals, and three-way valve position signals to control the operation of the three-way valve and solenoid valve. The controller detects and logically determines the operating status of the pump group and provides protection relays for both pumps.

[0040] Furthermore, in manual mode, the control device is provided with a lubricating oil pre-supply self-resetting switch, a dirty oil discharge self-resetting switch, and an oil pan refueling self-resetting switch corresponding to each engine; the switch is in a left and right self-resetting operation mode, with no operation in the middle position, and the left and right positions respectively corresponding to pump start and pump stop operation instructions. When the operation switch is rotated to the start position, the pump executes the start instruction, and when the operation switch is rotated to the stop position, the pump executes the stop instruction. When the pump is running during the execution of one instruction, other instructions are invalid unless the corresponding stop instruction is operated or the operation of this stage is stopped.

[0041] Furthermore, in automatic mode, the control device controls the pump group to pre-supply lubricating oil to the engines in the stopped state among the multiple engines in sequence, with an automatic operation frequency of T minutes per interval T1, wherein the automatic pre-supply function of the engines in the running state is automatically skipped.

[0042] Preferably, the control device further includes a status indication module and an alarm indication module.

[0043] Preferably, in the multi-purpose oil pump sharing system, the number of engines is 2-4.

[0044] The method proposed by the present invention for multiple engines to share two oil pumps meets the engine's requirements for lubricating oil pre-supply, waste oil drainage, and lubricating oil refueling. The two oil pumps are designed with one for use and one for backup. If one oil pump fails, the control device automatically activates the backup oil pump while alerting the operator. The lubricating oil pre-supply, waste oil drainage, and refueling operations for multiple engines are performed in a time-sharing manner, with only one control function active at a time. The control device is equipped with a manual-automatic transfer switch. In manual mode, the control device has a set of transfer switches for each engine. Each set of transfer switches includes three self-resetting transfer switches for lubricating oil pre-supply, waste oil drainage, and oil pan refueling. The transfer switches are in left and right self-resetting operation modes. The middle position is inoperative, and the left and right positions correspond to pump start and pump stop commands, respectively. When the transfer switch is rotated to the start position, the pump executes the start command, and when the switch is rotated to the stop position, the pump executes the stop command. While a command is being executed, the pump is running, and other commands are invalid unless the corresponding stop command is issued or the operation of that stage is stopped.

[0045] The automatic mode is the lubricating oil automatic pre-supply mode. The control device controls the pump group to pre-supply lubricating oil to the engines in the stopped state from 1# engine to n# engine in sequence, with a frequency of automatic operation for T minutes every interval T1 (both the interval time and the operation time can be set). The automatic pre-supply function of the engine in the running state is automatically skipped.

[0046] Manual lubricating oil pre-supply: Each time the pump is started, the pump will automatically stop after T minutes (the running time can be set).

[0047] The present invention also provides a method for using a multi-purpose oil pump sharing system. Using the system,

[0048] The control device is equipped with a manual / automatic transfer switch. The automatic state is only applicable to the lubricating oil pre-supply function. The dirty oil discharge and oil pan refueling only have manual control functions and the automatic pump stop function when the liquid level exceeds the limit. In manual mode, a set of self-resetting transfer switches is set for each engine. Each switch set includes a lubricating oil pre-supply control switch, a dirty oil discharge control switch and an oil pan refueling control switch.

[0049] In the automatic state, the control device enters the automatic lubricating oil pre-supply process, monitors whether the engine is in the stopped state, and automatically pre-supplies the lubricating oil to the stopped engine in sequence;

[0050] In manual mode, if the pump group is in a stopped state, when the control device monitors that there is a pre-supply instruction for the 1# engine, the control device sends an opening instruction for the oil pre-supply channel of the electric three-way valve STF1, and the 1#3# channels of STF1 are connected, and the oil pre-supply position in place signal is fed back to the control device. If the three-way valve in place signal is not received within a delay, the control device sends a three-way valve fault signal. If the control device receives the in place signal, it controls the main oil pump and the pre-supply solenoid valve YGF1 to operate, and the pre-supply oil is output from the oil port GGK of the oil pan through the oil pipe YFG10 and through the 1#3# channels of the three-way valve. , one-way valve NZF11, oil pipe YFG11 enters the oil inlet pipe of the pump group, the pump group refuels the lubricating oil through YGF1 and oil pipe YFG13 into the engine, during the operation of the oil pump, the oil pump fault relay detects the working condition of the oil pump, and at the same time the pressure sensor YLS1 detects the pre-supply oil pressure signal, if both are normal, the main oil pump continues to work, if any one of the signals is abnormal, the control device outputs the standby oil pump working instruction, the system automatically starts the standby oil pump, the oil pump stops automatically when the set time T is reached, or if the set time is not reached and there is a stop pre-supply signal, the oil pump will also stop automatically;

[0051] When the control device detects a command to discharge wastewater from the 1# engine, it issues a command to connect the wastewater oil pipeline of the electric three-way valve STF1. After a delay, it feeds back a wastewater oil position status signal after the 2# and 3# channels of STF1 are connected in place. If the three-way valve is not connected in place within the delay, the control device issues a three-way valve fault signal. After receiving the signal, the control device controls the oil pump and the wastewater solenoid valve WZF1 to operate. The oil pump fault relay detects the working condition of the oil pump. If there is no fault, the oil pump continues to operate. The wastewater oil is discharged from the DGK oil port of the oil pan through WFG1 and the 2# and 3# pipe ports of the three-way valve STF1, and enters the oil inlet pipe of the oil pump group through the one-way valve NZFY11. The wastewater oil is refueled by the oil pump and enters the waste oil tank through the oil pump output pipe, WZG1 oil pipe, and WZF1 solenoid valve. If there is any abnormality, the standby oil pump is automatically started. If there is no abnormality, the oil pump continues to operate. The oil pump stops when the control device receives a stop command or when the control device detects that the liquid level is below the limit.

[0052] When the control device detects a refueling command for the 1# engine oil pan, it issues a command to connect the refueling pipeline of the electric three-way valve STF1. After a delay, it feeds back a refueling position status signal to the control device after the 1# and 3# channels of STF1 are connected. If the three-way valve is not connected within the delay, the control device issues a three-way valve fault signal. If the control device receives the in-position signal, it controls the oil pump and the refueling solenoid valve JYF1 to operate. The oil pump fault relay detects the working condition of the oil pump. If there is no fault, the oil pump continues to operate. New oil is output from the new oil tank through JYF1 and JYG1 and enters the oil inlet pipeline of the oil pump group. The new oil is pressurized by the oil pump group and output from the oil outlet. It is output through the one-way valve NZF12 and the 1# and 3# pipe ports of the three-way valve STF1 and enters the oil pan through the refueling pipe JYG12. If there is any abnormality, the standby oil pump is automatically activated. If there is no abnormality, the oil pump continues to operate. When the control device receives a stop command, the oil pump stops operating, or when the control device detects that the liquid level is equal to or above the limit, it controls the oil pump to stop operating.

[0053] Furthermore, the control and protection device monitors the liquid level status in real time through the liquid level sensor. When the dirty oil discharge instruction is started, the pump group starts; when the dirty oil discharge stop instruction is received or the liquid level is monitored to be lower than the set value, the pump group stops running; similarly, when the oil pan refueling instruction is started, the pump group starts; when the refueling stop instruction is received or the liquid level is monitored to be greater than or equal to the set value, the pump group stops running.

[0054] In the present invention, multiple engines share two oil pumps, one for active use and one for backup, achieving oil pump redundancy while reducing the number of engine-related pumps, their piping, and control devices. The control device is equipped with three self-resetting switches for lubricating oil pre-supply, waste oil discharge, and oil pan refueling, enabling switching and control of lubricating oil pre-supply, waste oil discharge, and oil pan refueling. The control device is equipped with a set of switches corresponding to each engine. Through the switches, the oil pump group can be used not only as a pre-supply pump for multiple engines, but also as a waste oil discharge pump and an oil pan refueling pump, achieving the multi-purpose function of the shared oil pump. Compared with previous designs, the present invention's shared pump group redundant design has high reliability. A set of oil pumps, including one for active use and one for backup, can fulfill three purposes, resulting in high oil pump group utilization. Multiple units share a single oil pump, requiring fewer equipment such as oil pumps, piping, and control and protection devices. Pre-lubrication, waste oil discharge, and refueling for multiple engines are centrally controlled, requiring less piping and wiring, making operation simple and the oil pump group highly efficient.

Claims

1. A multi-purpose oil pump sharing system, characterized in that: include: The redundant oil pump group includes a working oil pump and a backup oil pump; the redundant oil pump group is provided with an oil inlet pipe and an oil outlet pipe; Multiple engines, each engine is connected to the oil outlet pipe of the redundant oil pump group through a corresponding oil circuit YFG, and an electromagnetic switch YGF is set on the oil circuit YFG corresponding to each engine; Multiple oil pans, each with a high-level oil port and a low-level oil port. The high-level oil port is used for the lubricating oil pre-supply outlet and the oil pan refueling inlet, and the low-level oil port is used for the dirty oil discharge port. The high-level oil port is connected to the 1# port of the electric three-way valve via an oil pipe YFG, and the low-level oil port is connected to the 2# port of the electric three-way valve via an oil pipe. The 3# port of the electric three-way valve is connected to the oil outlet pipe of the oil pump group via an oil circuit JYG and to the oil inlet pipe of the oil pump group via an oil circuit YFG. A one-way valve NZFJ is provided on the oil circuit JYG, and a one-way valve NZFY is provided on the oil circuit YFG. The two check valves NZFJ and NZFY are in opposite directions. Each oil pan is also provided with a liquid level sensor. The dirty oil tank is connected to the oil outlet pipe of the redundant oil pump group through an oil circuit WZG, and a solenoid valve WZF is provided on the oil circuit WZG; The new oil tank is connected to the oil inlet pipe of the redundant oil pump group through the oil circuit JZG, and the oil circuit JZG is provided with a solenoid valve JYF; a control device electrically connected to the liquid level sensor and provided with a switch electrically connected to all the solenoid valves; The control device is provided with a manual-automatic conversion switch for controlling the system to be in automatic mode or manual mode; The control device is equipped with a manual / automatic transfer switch. The automatic state is only applicable to the lubricating oil pre-supply function. The dirty oil discharge and oil pan refueling only have manual control functions and the automatic pump stop function when the liquid level exceeds the limit. In manual mode, a set of self-resetting transfer switches is set for each engine. Each switch set includes a lubricating oil pre-supply control switch, a dirty oil discharge control switch and an oil pan refueling control switch. In the automatic state, the control device enters the automatic lubricating oil pre-supply process, monitors whether the engine is in the stopped state, and automatically pre-supplies the lubricating oil to the stopped engine in sequence; In manual mode, if the pump group is in a stopped state, when the control device monitors that there is a pre-supply instruction for the 1# engine, the control device sends an opening instruction for the oil pre-supply channel of the electric three-way valve STF1, and the 1#3# channels of STF1 are connected, and the oil pre-supply position in place signal is fed back to the control device. If the three-way valve in place signal is not received within a delay, the control device sends a three-way valve fault signal. If the control device receives the in place signal, it controls the main oil pump and the pre-supply solenoid valve YGF1 to operate, and the pre-supply oil is output from the oil port GGK of the oil pan through the oil pipe YFG10 and through the 1#3# channels of the three-way valve. , one-way valve NZF11, oil pipe YFG11 enters the oil inlet pipe of the pump group, the pump group refuels the lubricating oil through YGF1 and oil pipe YFG13 into the engine, during the operation of the oil pump, the oil pump fault relay detects the working condition of the oil pump, and at the same time the pressure sensor YLS1 detects the pre-supply oil pressure signal, if both are normal, the main oil pump continues to work, if any one of the signals is abnormal, the control device outputs the standby oil pump working instruction, the system automatically starts the standby oil pump, the oil pump stops automatically when the set time T is reached, or if the set time is not reached and there is a stop pre-supply signal, the oil pump will also stop automatically; When the control device detects a command to discharge wastewater from the 1# engine, it issues a command to connect the wastewater oil pipeline of the electric three-way valve STF1. After a delay, it feeds back a wastewater oil position status signal after the 2# and 3# channels of STF1 are connected in place. If the three-way valve is not connected in place within the delay, the control device issues a three-way valve fault signal. After receiving the signal, the control device controls the oil pump and the wastewater solenoid valve WZF1 to operate. The oil pump fault relay detects the working condition of the oil pump. If there is no fault, the oil pump continues to operate. The wastewater oil is discharged from the DGK oil port of the oil pan through WFG1 and the 2# and 3# pipe ports of the three-way valve STF1, and enters the oil inlet pipe of the oil pump group through the one-way valve NZFY11. The wastewater oil is refueled by the oil pump and enters the waste oil tank through the oil pump output pipe, WZG1 oil pipe, and WZF1 solenoid valve. If there is any abnormality, the standby oil pump is automatically started. If there is no abnormality, the oil pump continues to operate. The oil pump stops when the control device receives a stop command or when the control device detects that the liquid level is below the limit. When the control device detects a refueling command for the 1# engine oil pan, it issues a command to connect the refueling pipeline of the electric three-way valve STF1. After a delay, it feeds back a refueling position status signal to the control device after the 1# and 3# channels of STF1 are connected. If the three-way valve is not connected within the delay, the control device issues a three-way valve fault signal. If the control device receives the in-position signal, it controls the oil pump and the refueling solenoid valve JYF1 to operate. The oil pump fault relay detects the working condition of the oil pump. If there is no fault, the oil pump continues to operate. New oil is output from the new oil tank through JYF1 and JYG1 and enters the oil inlet pipeline of the oil pump group. The new oil is pressurized by the oil pump group and output from the oil outlet. It is output through the one-way valve NZF12 and the 1# and 3# pipe ports of the three-way valve STF1 and enters the oil pan through the refueling pipe JYG12. If there is any abnormality, the standby oil pump is automatically activated. If there is no abnormality, the oil pump continues to operate. When the control device receives a stop command, the oil pump stops operating, or when the control device detects that the liquid level is equal to or above the limit, it controls the oil pump to stop operating.

2. A multi-purpose oil pump sharing system according to claim 1, characterized in that: In manual mode, the control device is provided with a lubricating oil pre-supply self-reset switch, a dirty oil discharge self-reset switch, and an oil pan refueling self-reset switch corresponding to each engine; the switch is in a left and right self-reset operation mode, with no operation in the middle position, and the left and right positions respectively corresponding to pump start and pump stop operation instructions. When the operation switch is rotated to the start position, the pump executes the start instruction, and when the operation switch is rotated to the stop position, the pump executes the stop instruction. When one instruction is being executed and the pump is in operation, other instructions are invalid unless the corresponding stop instruction is operated.

3. The multi-purpose oil pump sharing system according to claim 2, characterized in that: In the automatic mode, the control device controls the pump group to pre-supply lubricating oil to the engines in the stopped state among the multiple engines in sequence, and automatically runs for T minutes every interval T1, wherein the automatic pre-supply function of the engines in the running state is automatically skipped.

4. The multi-purpose oil pump sharing system according to claim 1, characterized in that: The control device also includes a status indication module and an alarm indication module.

5. The multi-purpose oil pump sharing system according to claim 1, characterized in that: In a multi-purpose oil pump sharing system, the number of engines is 2-4.

6. The multi-purpose oil pump sharing system according to claim 1, characterized in that: The control and protection device monitors the liquid level status in real time through the liquid level sensor. When the dirty oil discharge command is started, the pump group starts. When the dirty oil discharge stop command is received or the liquid level is monitored to be lower than the set value, the pump group stops running. Similarly, when the oil pan refueling command is started, the pump group starts. When the refueling stop command is received or the liquid level is monitored to be greater than or equal to the set value, the pump group stops running.

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