A diesel generator set starting auxiliary device and control method thereof

Abstract

The invention discloses a diesel generator set starting auxiliary device and a control method thereof, belonging to the technical field of diesel generator sets, wherein a cylinder jacket water heating unit and an engine oil pre-supply heating unit are electrically connected to a control box respectively, the control box is electrically connected to monitoring instruments of a plurality of diesel engines for obtaining signals indicating whether the diesel engines are running successfully, an inlet of the cylinder jacket water heating unit is communicated with cylinder jacket water outlets of a plurality of diesel engines, an outlet of the cylinder jacket water heating unit is communicated with cylinder jacket water inlet of the diesel engine, an inlet of the engine oil pre-supply heating unit is communicated with oil pan oil outlets of a plurality of diesel engines, and an outlet of the engine oil pre-supply heating unit is communicated with oil pan oil inlet of the diesel engine; the application can realize that one device meets the auxiliary starting requirements of preheating and pre-lubrication of a plurality of diesel generator sets of a whole ship through a corresponding control method, thereby saving the layout space of the engine room, reducing the failure points, improving the reliability of the ship, and saving the purchase cost of the equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel generator sets, and in particular relates to a diesel generator set starting auxiliary device and a control method thereof. Background Art

[0002] For diesel generator sets with large cylinder diameters, rapid cold start and loading will result in insufficient preheating and prelubrication, which can easily lead to faults such as cylinder pulling and chipping of diesel engines. In order to prevent the above problems, diesel generator sets are usually equipped with cylinder jacket water preheating devices, electric pre-supply oil pumps and oil preheating devices, as well as their start-stop control systems. There are the following problems when multiple starting auxiliary equipment are equipped on one generator set at the same time: 1. It increases the complexity of the installation of the unit on board; 2. It is difficult to achieve automatic control of multiple starting auxiliary equipment; 3. It increases the number of fault points, which is not conducive to improving the reliability of the entire ship; 4. It is not conducive to cost savings. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a diesel generator set starting auxiliary device and a control method thereof, which can meet the auxiliary starting requirements of multiple diesel generator sets through one device, save the layout space of the engine room, reduce the failure points, and indirectly improve the reliability of the ship.

[0004] In order to solve the above technical problems, the technical solution of the present invention is:

[0005] A diesel generator start-up auxiliary device comprises a cylinder jacket water heating unit and an oil pre-supply heating unit, wherein the oil pre-supply heating unit comprises an electric oil pre-supply pump and an oil heater arranged on the same pipeline, and the cylinder jacket water heating unit comprises a water heater and a water circulation pump arranged on the same pipeline, wherein the cylinder jacket water heating unit and the oil pre-supply heating unit are respectively electrically connected to a control box, and the control box is electrically connected to a monitoring instrument of a plurality of diesel engines for obtaining a signal of whether the diesel engines are running successfully; the inlet of the cylinder jacket water heating unit is communicated with the cylinder jacket water outlets of the plurality of diesel engines, the outlet of the cylinder jacket water heating unit is communicated with the cylinder jacket water inlet of the diesel engine, and the inlet of the cylinder jacket water heating unit is connected to the monitoring instrument of the plurality of diesel engines; A first control valve is arranged on the pipeline between the cylinder liner water outlets, and a second control valve is arranged on the pipeline between the outlet of the cylinder liner water heating unit and the cylinder liner water inlet; the inlet of the engine oil pre-supply heating unit is communicated with the oil pan oil outlets of the plurality of diesel engines, the outlet of the engine oil pre-supply heating unit is communicated with the oil pan oil inlet of the diesel engine after being communicated with the main oil passage, a third control valve is arranged on the pipeline between the inlet of the engine oil pre-supply heating unit and the oil pan oil outlet, and a fourth control valve is arranged on the pipeline between the outlet of the engine oil pre-supply heating unit and the main oil passage; the first control valve, the second control valve, the third control valve and the fourth control valve are electrically connected to the control box respectively.

[0006] Furthermore, the inlet of the cylinder jacket water heating unit and the cylinder jacket water replenishing port of the diesel engine are connected to a water tank, and a fifth control valve electrically connected to the control box is provided on the pipeline between the water tank and the inlet of the cylinder jacket water heating unit.

[0007] Furthermore, a first one-way valve is provided on the pipeline at the water inlet of the cylinder liner, and the water inlet of the cylinder liner is connected to the pipeline behind the water pump in the diesel engine.

[0008] Furthermore, the inlets of the cylinder jacket water heating unit and the engine oil pre-supply heating unit are provided with temperature sensors, and the temperature sensors are electrically connected to the control box.

[0009] Furthermore, the jacket water heating unit also includes a second one-way valve arranged at the outlet.

[0010] Furthermore, the oil pre-supply heating unit also includes a third one-way valve arranged at the outlet.

[0011] Furthermore, a liquid level detection device for detecting the oil level in the oil pan is installed in the oil pan of the diesel engine, and the liquid level detection device is electrically connected to the control box.

[0012] Furthermore, the liquid level detection device includes a high liquid level switch and a low liquid level switch. When the oil level in the oil pan is higher than the high liquid level switch, the high liquid level switch is triggered; when the oil level in the oil pan is lower than the low liquid level switch, the low liquid level switch is triggered.

[0013] The control method based on the above-mentioned diesel generator starting auxiliary device includes: when several of the diesel engines are in a shutdown state, the fifth control valve, the second control valve, the water heater and the water circulation pump are opened, and the first control valve is closed; when it is detected that the water temperature is higher than the set value, the water heater stops working; when it is detected that the water temperature is lower than the set value, the water heater restarts; when some of the diesel engines are in a shutdown state, the fifth control valve, the first control valve corresponding to the shutdown diesel engine and the second control valve corresponding to the running diesel engine are closed, and the first control valve corresponding to the running diesel engine, the second control valve corresponding to the shutdown diesel engine and the water circulation pump are opened; when one of the diesel engines is started, the water inlet of the cylinder liner of the diesel engine is closed. The first one-way valve closes automatically, and the corresponding monitoring instrument sends a successful operation signal. When the signal that all diesel engines are successfully operating is detected, the water heater and the water circulation pump stop working; when several of the diesel engines are in a shutdown state, the third control valve, the fourth control valve, the electric oil pre-supply pump and the oil heater are opened. When the oil temperature is detected to be higher than the set value, the oil heater stops working. When the oil temperature is detected to be lower than the set value, the oil heater restarts. When one of the diesel engines is started, the control box closes the third control valve and the fourth control valve corresponding to the diesel engine after receiving the successful operation signal of the diesel engine. When the signal that all diesel engines are successfully operating is detected, the electric oil pre-supply pump and the oil heater stop working.

[0014] Furthermore, when it is detected that the high liquid level switch in the oil pan of one of the diesel engines is triggered, the fourth control valve corresponding to the diesel engine is closed, and when it is detected that the low liquid level switch in the oil pan of the diesel engine is triggered, the corresponding fourth control valve is closed.

[0015] After adopting the above technical solution, the beneficial effects of the present invention are:

[0016] The diesel generator starting auxiliary device and control method thereof of the present invention include a cylinder jacket water heating unit and an oil pre-supply heating unit, the oil pre-supply heating unit includes an electric oil pre-supply pump and an oil heater arranged on the same pipeline, the cylinder jacket water heating unit includes a water heater and a water circulation pump arranged on the same pipeline, the cylinder jacket water heating unit and the oil pre-supply heating unit are electrically connected to a control box respectively, the control box is electrically connected to a monitoring instrument of a plurality of diesel engines for obtaining a signal of whether the diesel engine is running successfully, the inlet of the cylinder jacket water heating unit is connected to the cylinder jacket water outlet of the plurality of diesel engines, the outlet of the cylinder jacket water heating unit is connected to the cylinder jacket water inlet of the diesel engine, the inlet of the oil pre-supply heating unit is connected to the oil outlet of the oil pan of the plurality of diesel engines, the outlet of the oil pre-supply heating unit is connected to the main oil channel and then connected to the diesel engine The oil inlet of the oil pan is connected; the application can realize that one device meets the auxiliary starting requirements of preheating and pre-lubrication of multiple diesel generator sets on the whole ship through the corresponding control method; the device comes with a control box, and it only needs to provide the device with a successful operation signal through the monitor as an interlocking signal for the start and stop of the relevant units. There is no need for the diesel engine control box to have complex control logic and monitoring functions for the heating unit, which simplifies the installation of the diesel generator set and on board, saves the layout space of the engine room, reduces the number of equipment, reduces the failure points, indirectly improves the reliability of the ship, and is conducive to simplifying the complexity of diesel engine control and ship control systems; at the same time, since only one AC power cable and an interlocking signal cable between the engine and the device are needed, the layout of ship cables is simplified and the procurement cost of equipment is saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a diesel generator set starting auxiliary device of the present invention;

[0018] Figure 2 yes Figure 1 Side view of

[0019] Figure 3 It is a schematic diagram of the principle of the cylinder jacket water heating of the diesel generator set starting auxiliary device of the present invention;

[0020] Figure 4 It is a schematic diagram of the principle of oil pre-supply and heating of the diesel generator set starting auxiliary device of the present invention;

[0021] In the figure, 1-base, 2-control box, 3-fresh water inlet valve, 4-cylinder liner water heating unit, 5-water circulation pump, 6-water heater, 7-second non-return valve, 8-fresh water outlet valve, 9-engine oil inlet valve, 10-engine oil pre-supply heating unit, 11-motor oil pre-supply pump, 12-engine oil heater, 13-third non-return valve, 14-engine oil outlet valve, 15-diesel engine, 16-cylinder liner, 17-water pump, 18-water tank, 19-oil pan, 20-high liquid level switch, 21-low liquid level switch. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] The directions mentioned in this specification are based on those shown in the drawings and only represent relative positions, not absolute positions.

[0024] Embodiment 1:

[0025] like Figure 1 and Figure 2 As shown together, a diesel generator start-up auxiliary device includes a cylinder jacket water heating unit 4 and an oil pre-supply heating unit 10, the oil pre-supply heating unit 10 includes an electric oil pre-supply pump 11 and an oil heater 12 arranged on the same pipeline, the cylinder jacket water heating unit 4 includes a water heater 6 and a water circulation pump 5 arranged on the same pipeline, the cylinder jacket water heating unit 4 and the oil pre-supply heating unit 10 are respectively electrically connected to a control box 2, and the control box 2 is electrically connected to a monitoring instrument of a plurality of diesel engines 15 for obtaining a signal whether the diesel engine 15 is running successfully. The cylinder jacket water heating unit 4, the oil pre-supply heating unit 10 and the control box 2 are all installed on a base 1 and integrated into one device.

[0026] like Figure 1 and Figure 2 As shown in common, fresh water enters through the fresh water inlet valve 3 located at the inlet of the water circulation pump 5, passes through the water circulation pump 5 and the water heater 6, and flows out through the fresh water outlet valve 8. A second check valve 7 is arranged on the pipeline between the water heater 6 and the fresh water outlet valve 8 to prevent backflow during the water circulation heating process. The engine oil enters through the engine oil inlet valve 9 located at the inlet of the motor oil pre-supply pump 11, passes through the motor oil pre-supply pump 11 and the engine oil heater 12, and flows out through the engine oil outlet valve 14. A third check valve 13 is arranged on the pipeline between the engine oil heater 12 and the engine oil outlet valve 14 to prevent backflow during the engine oil pre-supply and heating process.

[0027] like Figure 3As shown, the inlet of the cylinder jacket water heating unit 4 is connected to the water outlet of the cylinder jacket 16 of several diesel engines 15, the outlet of the cylinder jacket water heating unit 4 is connected to the water inlet of the cylinder jacket 16 of the diesel engine 15, a first control valve V1 is arranged on the pipeline between the inlet of the cylinder jacket water heating unit 4 and the water outlet of the cylinder jacket 16, and a second control valve V2 is arranged on the pipeline between the outlet of the cylinder jacket water heating unit 4 and the water inlet of the cylinder jacket 16. The inlet of the cylinder jacket water heating unit 4 and the water replenishment port of the cylinder jacket 16 of the diesel engine 15 are connected to the water tank 18, and the water tank 18 is an expansion water tank 18, which is used to replenish water for the cylinder jacket 16 of the diesel engine 15. A fifth control valve V0 electrically connected to the control box 2 is arranged on the pipeline between the water tank 18 and the inlet of the cylinder jacket water heating unit 4, and the first control valve V1, the second control valve V2 and the fifth control valve V0 are electrically connected to the control box 2 respectively.

[0028] like Figure 3 As shown, when the diesel engine 15 is in the shutdown state, the control box 2 forms a cycle of "water tank 18-fifth control valve V0-cylinder jacket water heating unit 4-second control valve V2-cylinder jacket water inlet of diesel engine 15-cylinder jacket 16-cylinder jacket water filling port-water tank 18" by controlling the first control valve V1, the second control valve V2, the fifth control valve V0, the water circulation pump 5 and the water heater 6. The inlet of the cylinder jacket water heating unit 4 is provided with a temperature sensor electrically connected to the control box 2, which can measure the temperature of the cooling water in the water tank 18. The control box 2 can set the temperature control range of the water heater 6. When it is detected that the cooling water temperature is higher than the set value, the water heater 6 automatically stops working, and the water circulation pump 5 continues to run. When it is detected that the cooling water temperature is lower than the set value, the water heater 6 restarts.

[0029] like Figure 3 As shown, a first one-way valve S1 is provided on the pipeline at the water inlet of the cylinder liner 16, and the water inlet of the cylinder liner 16 is connected to the pipeline behind the water pump 17 in the diesel engine 15. Since the heated cooling water is injected into the pipeline behind the water pump 17 through the first one-way valve, when the diesel engine 15 is started, the pressure behind the water pump 17 is relatively large. Due to the pressure difference, the corresponding first one-way valve S1 is closed, and the heater stops heating the running engine. When a diesel engine 15 is started successfully, the control box 2 can receive the diesel engine 15 operation success signal sent by the corresponding monitoring instrument. When the signal that all diesel engines 15 are running successfully is detected, the water heater 6 and the water circulation pump 5 stop working.

[0030] like Figure 3As shown, the setting of the pipeline is demonstrated by taking two diesel engines 15 as an example in the attached figure. When some diesel engines 15 are in a shutdown state, such as diesel engine No. 1 15 is running and diesel engine No. 2 15 is shut down, the control box 2 controls the first control valve V1, the second control valve V2, the fifth control valve V0 and the water circulation pump 5 to form a cycle of "cylinder liner water outlet of diesel engine No. 1 15 - first control valve V1 - cylinder liner water heating unit 4 - second control valve V2 - cylinder liner water inlet of diesel engine No. 2 15 - cylinder liner water replenishment port of diesel engine No. 2 15 - water tank 18 - cylinder liner water replenishment port of diesel engine No. 1 15", that is, water from the cylinder liner 16 of the running diesel engine 15 is extracted to warm the cylinder of the shut down diesel engine 15, without starting the water heater 6, thereby saving energy.

[0031] like Figure 4 As shown, the inlet of the oil pre-supply heating unit 10 is connected to the oil outlet of the oil pan 19 of several diesel engines 15, the outlet of the oil pre-supply heating unit 10 is connected to the main oil channel of the diesel engine 15 and then connected to the oil inlet of the oil pan 19 of the diesel engine 15, a third control valve V3 is arranged on the pipeline between the inlet of the oil pre-supply heating unit 10 and the oil outlet of the oil pan 19, a fourth control valve V4 is arranged on the pipeline between the outlet of the oil pre-supply heating unit 10 and the main oil channel, and the third control valve V3 and the fourth control valve V4 are electrically connected to the control box 2 respectively.

[0032] like Figure 4 As shown, when the diesel engine 15 is in the shutdown state, the third control valve V3, the fourth control valve V4, the electric oil pre-supply pump 11 and the oil heater 12 are all opened, forming a cycle of "oil pan oil outlet-third control valve V3-oil pre-supply heating unit 10-fourth control valve V4-oil pan oil inlet", and the electric oil pre-supply pump 11 continuously extracts oil from the oil pan 19, so that the oil is heated by the oil pre-supply heating unit 10 and then injected into the main oil channel of the diesel engine 15, so as to achieve pre-lubrication of each friction pair of the diesel engine 15 and heating of the lubricating oil. A temperature sensor is provided at the inlet of the oil pre-supply heating unit 10, and the temperature sensor is electrically connected to the control box 2 to measure the temperature of the oil. The control box 2 can set the temperature control range of the oil heater 12. When the temperature is detected to be higher than the set value, the oil heater 12 stops working, and when the oil temperature is detected to be lower than the set value, the oil heater 12 automatically starts working again. During this process, the electric oil pre-supply pump 11 does not stop working.

[0033] like Figure 4As shown, when a diesel engine 15 is started, the control box 2 automatically sends a closing signal to the third control valve V3 and the fourth control valve V4 corresponding to the running diesel engine 15 after receiving the successful operation signal of the diesel engine 15. The device stops pre-lubricating and pre-heating the oil for the running diesel engine 15, and continues to pre-heat and pre-lubricate the oil for the stopped diesel engine 15. When all engines are running at the same time, the control box 2 will control all control valves of the oil pre-lubrication pipeline system to close, and stop the electric oil pre-supply pump 11 and the oil heater 12. The oil heater 12 can only work when the electric oil pre-supply pump 11 is working to prevent dry burning from burning the heating device.

[0034] like Figure 4 As shown, a liquid level detection device for detecting the oil level in the oil pan 19 is installed in the oil pan 19 of the diesel engine 15, and the liquid level detection device is electrically connected to the control box 2. When there is too much oil in the oil pan 19 of a diesel engine 15, the corresponding fourth control valve V4 is closed and not inputted temporarily until the liquid level is lowered and opened; or when there is too little oil in the oil pan 19 of a diesel engine 15, the corresponding third control valve V3 is closed and not outputted temporarily until the liquid level is raised and opened. This avoids uneven oil supply when the electric oil pre-supply pump 11 pre-lubricates multiple diesel engines 15 at the same time.

[0035] like Figure 4 As shown, the liquid level detection device specifically includes a high liquid level switch 20 and a low liquid level switch 21. When the oil level in the oil pan 19 is higher than the high liquid level switch 20, the high liquid level switch 20 is triggered; when the oil level in the oil pan 19 is lower than the low liquid level switch 21, the low liquid level switch 21 is triggered. Through the signals sent by the high liquid level switch 20 and the low liquid level switch 21, the control box 2 controls the switch state of the corresponding third control valve V3 or the fourth control valve V4.

[0036] The control box 2 also has autonomous monitoring functions such as oil pre-supply, oil heating, automatic timing control of cooling water heating, overload protection, fault alarm, etc. The control box of the diesel engine 15 only needs to provide the device with a successful operation signal as an interlocking signal for starting and stopping related units. There is no need for the control box of the diesel engine 15 to have complex control logic and monitoring functions for the heating unit.

[0037] Embodiment 2:

[0038] like Figure 3As shown, the control method of the diesel generator starting auxiliary device based on the first embodiment includes: when several diesel engines 15 are in a shutdown state, the fifth control valve V0, the second control valve V2, the water heater 6 and the water circulation pump 5 are opened, and the first control valve V1 is closed. When the water temperature is detected to be higher than the set value, the water heater 6 stops working, and when the water temperature is detected to be lower than the set value, the water heater 6 is restarted; when some diesel engines 15 are in a shutdown state, the fifth control valve V0, the first control valve V1 corresponding to the shutdown diesel engine 15 and the second control valve V2 corresponding to the running diesel engine 15 are closed, and the first control valve V1 corresponding to the running diesel engine 15, the second control valve V2 corresponding to the shutdown diesel engine 15 and the water circulation pump 5 are opened.

[0039] like Figure 3 As shown, when one of the diesel engines 15 is started, the first one-way valve S1 at the water inlet of the cylinder liner 16 of the diesel engine 15 is automatically closed, and the corresponding monitoring instrument sends a successful operation signal. When the signal that all diesel engines 15 are running successfully is detected, the water heater 6 and the water circulation pump 5 stop working.

[0040] like Figure 4 As shown, the control method also includes: when several diesel engines 15 are in a shutdown state, the third control valve V3, the fourth control valve V4, the electric oil pre-supply pump 11 and the oil heater 12 are opened; when it is detected that the oil temperature is higher than the set value, the oil heater 12 stops working; when it is detected that the oil temperature is lower than the set value, the oil heater 12 restarts; when one of the diesel engines 15 is started, the control box 2 closes the third control valve V3 and the fourth control valve V4 corresponding to the diesel engine 15 after receiving a signal that the diesel engine 15 is running successfully; when it is detected that all the diesel engines 15 are running successfully, the electric oil pre-supply pump 11 and the oil heater 12 stop working.

[0041] like Figure 4 As shown, when the high liquid level switch 20 in the oil pan 19 of one of the diesel engines 15 is detected to be triggered, the fourth control valve V4 corresponding to the diesel engine 15 is closed, and when the low liquid level switch 21 in the oil pan 19 of the diesel engine 15 is detected to be triggered, the corresponding fourth control valve V4 is closed.

[0042] The diesel generator starting auxiliary device and control method of the present invention connect the cylinder jacket water heating unit and the oil pre-supply heating unit to the cylinder jacket and oil pan of the diesel engine through pipelines, and set control valves on the pipelines. The water circulation pump, water heater, electric oil pre-supply pump, oil heater and switches of each control valve on its control panel are controlled by a control box, so that one device can heat cooling water, pre-supply oil and heat oil for multiple diesel generator sets, thereby saving ship space and reducing costs.

[0043] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that the described embodiments are only some embodiments of the present invention, rather than all embodiments, which are merely examples, and the protection scope of the present invention is defined by the claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention and without any creative work, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A diesel generator starting auxiliary device, characterized in that: It includes a cylinder jacket water heating unit and an oil pre-supply heating unit, the oil pre-supply heating unit includes an electric oil pre-supply pump and an oil heater arranged on the same pipeline, the cylinder jacket water heating unit includes a water heater and a water circulation pump arranged on the same pipeline, the cylinder jacket water heating unit and the oil pre-supply heating unit are electrically connected to a control box respectively, and the control box is electrically connected to a monitoring instrument of a plurality of diesel engines for obtaining a signal of whether the diesel engine is running successfully; The inlet of the cylinder jacket water heating unit is communicated with the cylinder jacket water outlets of the diesel engines, the outlet of the cylinder jacket water heating unit is communicated with the cylinder jacket water inlet of the diesel engines, a first control valve is provided on the pipeline between the inlet of the cylinder jacket water heating unit and each of the cylinder jacket water outlets, and a second control valve is provided on the pipeline between the outlet of the cylinder jacket water heating unit and each of the cylinder jacket water inlets; The inlet of the engine oil pre-supply heating unit is communicated with the oil pan oil outlets of the plurality of diesel engines, the outlet of the engine oil pre-supply heating unit is communicated with the oil pan oil inlet of the diesel engine after being communicated with the main oil gallery, a third control valve is provided on the pipeline between the inlet of the engine oil pre-supply heating unit and each of the oil pan oil outlets, and a fourth control valve is provided on the pipeline between the outlet of the engine oil pre-supply heating unit and each of the main oil galleries; The inlet of the cylinder jacket water heating unit and the cylinder jacket water replenishing port of the diesel engine are in communication with a water tank, and a fifth control valve electrically connected to the control box is provided on the pipeline between the water tank and the inlet of the cylinder jacket water heating unit; The first control valve, the second control valve, the third control valve and the fourth control valve are electrically connected to the control box respectively; When the diesel engines are all in a stopped state, the control box controls the switch state of the corresponding control valves, so that the cooling water in the water tank is circulated and heated through the water inlet and the water replenishing port of the cylinder liner of the diesel engine, and the engine oil in the oil pan is circulated and heated through the oil pan outlet and the main oil channel of the diesel engine; When some of the diesel engines are in a shutdown state, the control box controls the switching state of the corresponding control valves, so that the cooling water is circulated and heated through the cylinder liner water outlet of the running diesel engine, the cylinder liner water inlet of the shutdown diesel engine, the cylinder liner water filling port of the shutdown diesel engine, and the water tank, and the engine oil is circulated and heated at the oil pan outlet of the shutdown diesel engine and the main oil channel of the diesel engine.

2. The diesel generator starting auxiliary device according to claim 1, characterized in that: A first one-way valve is arranged on the pipeline at the cylinder liner water inlet, and the cylinder liner water inlet is connected to the pipeline behind the water pump in the diesel engine.

3. The diesel generator starting auxiliary device according to claim 2, characterized in that: The inlets of the cylinder jacket water heating unit and the engine oil pre-supply heating unit are provided with temperature sensors, and the temperature sensors are electrically connected to the control box.

4. The diesel generator starting auxiliary device according to claim 3, characterized in that: The jacket water heating unit further includes a second one-way valve disposed at an outlet.

5. The diesel generator starting auxiliary device according to claim 4, characterized in that: The engine oil pre-heating unit further includes a third one-way valve arranged at an outlet.

6. The diesel generator starting auxiliary device according to claim 5, characterized in that: A liquid level detection device for detecting the oil level in the oil pan is installed in the oil pan of the diesel engine, and the liquid level detection device is electrically connected to the control box.

7. The diesel generator starting auxiliary device according to claim 6, characterized in that: The liquid level detection device includes a high liquid level switch and a low liquid level switch. When the oil level in the oil pan is higher than the high liquid level switch, the high liquid level switch is triggered; when the oil level in the oil pan is lower than the low liquid level switch, the low liquid level switch is triggered.

8. The control method of the diesel generator set starting auxiliary device according to claim 7, characterized in that: include: When the diesel engines are all in a stopped state, the fifth control valve, the second control valve, the water heater and the water circulation pump are opened, and the first control valve is closed. When the water temperature is detected to be higher than a set value, the water heater stops working, and when the water temperature is detected to be lower than a set value, the water heater restarts; When some of the diesel engines are in a shutdown state, the fifth control valve, the first control valve corresponding to the shutdown diesel engine and the second control valve corresponding to the running diesel engine are closed, and the first control valve corresponding to the running diesel engine, the second control valve corresponding to the shutdown diesel engine and the water circulation pump are opened; When one of the diesel engines is started, the first one-way valve at the water inlet of the cylinder liner of the diesel engine is automatically closed, and the corresponding monitoring instrument sends a successful operation signal. When the successful operation signal of all diesel engines is detected, the water heater and the water circulation pump stop working; When the plurality of diesel engines are in a shutdown state, the third control valve, the fourth control valve, the electric motor oil pre-supply pump and the oil heater are turned on; when it is detected that the oil temperature is higher than a set value, the oil heater stops working; when it is detected that the oil temperature is lower than a set value, the oil heater restarts; When one of the diesel engines is started, the control box closes the third control valve and the fourth control valve corresponding to the diesel engine after receiving the successful operation signal of the diesel engine. When the successful operation signal of all diesel engines is detected, the electric oil pre-supply pump and the oil heater stop working.

9. The control method according to claim 8, characterized in that: When it is detected that the high liquid level switch in the oil pan of one of the diesel engines is triggered, the fourth control valve corresponding to the diesel engine is closed. When it is detected that the low liquid level switch in the oil pan of the diesel engine is triggered, the corresponding fourth control valve is closed.

Images