A multi-pump combined fuel supply structure for a diesel-diesel combined propulsion device

Abstract

This invention relates to a multi-pump combined fuel supply structure and method for use in a combined diesel and diesel propulsion system. The invention addresses the problem of high pump noise in the fuel supply unit of a CODAD (Coaxial Diesel and Automotive Diesel) system, which increases the overall noise level of the ship during operation. When the first, second, and third fuel pumps of this invention start operating, the first pump supplies fuel to the second and third pumps via a third and fourth bypass branch, respectively. The second pump supplies fuel to the third pump via a fifth bypass branch. This multi-pump combined supply of fuel to the gearbox simultaneously reduces the fuel intake of the second and third pumps, lowers their operating noise, and thus improves the practicality of the invention. This invention belongs to the field of marine propulsion system fuel supply technology.

Description

Technical Field

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[0001] The present invention relates to an oil supply structure, specifically to a multi-pump combined oil supply structure for a combined diesel and diesel propulsion device, belonging to the technical field of oil supply for marine propulsion devices. Background Art

[0002] A combined diesel and diesel propulsion device (Combined Diesel And Diesel Configuration, CODAD) is applicable to multi-condition ships, and can achieve various operating conditions such as dual-engine input and single-output, single-engine input and single-output (the other diesel engine is stationary or idling), etc., and can reduce the rotational speed of the diesel engine to the corresponding rotational speed of the propeller shaft, transfer the output power of the diesel engine to the propeller shaft, and bear the main function of the propeller thrust. Its oil supply unit plays roles such as heat dissipation and lubrication for components such as gears, bearings, and clutches of the CODAD device, and its stability directly affects the reliable operation of the CODAD device.

[0003] Currently, in the oil supply units supporting CODAD devices, each oil pump supplies oil to the oil supply point independently. However, due to the numerous operating conditions of the CODAD device during operation, this results in high operating noise of each independently operating oil pump during oil supply, thereby increasing the noise during ship operation.

[0004] In summary, how to propose a brand-new oil supply structure for the above technical problems has become an urgent problem for technicians in the current field. Summary of the Invention

[0005] In view of the above deficiencies of the prior art, the present invention provides a multi-pump combined oil supply structure for a combined diesel and diesel propulsion device.

[0006] The technical solution of the present invention is: A multi-pump combined oil supply structure for a combined diesel and diesel propulsion device, including a gearbox, a first branch, a second branch, a third branch, and a standby branch.

[0007] The standby branch includes a first oil suction filter, an electric standby lubricating oil pump, an eighth one-way valve, a duplex oil filter, a plate heat exchanger, and a three-way temperature automatic regulating valve connected in sequence through pipelines, and the standby branch is connected to each lubricating part in the gearbox.

[0008] The first branch includes a second oil suction filter and a first oil pump connected in sequence through pipelines.

[0009] The second branch includes a third oil suction filter and a second oil pump connected in sequence through pipelines.

[0010] The third branch includes a fourth oil suction filter and a third oil pump connected in sequence through pipelines.

[0011] The oil inlets of the first, second, third, and fourth oil suction filters are all connected to the oil tank. The outlets of the electric standby lubricating oil pump, the first oil pump, and the second oil pump are all equipped with exhaust pipes connected to the side wall of the gearbox. The first branch, the second branch, and the third branch are all connected to the outlet of the eighth check valve.

[0012] The inlet of the eighth check valve is provided with a first bypass branch and a second bypass branch. The second bypass branch is connected to the inlet of the second oil pump, and the first bypass branch is connected to the inlet of the first oil pump. The outlet of the eighth check valve is equipped with an overflow valve, and the return port of the overflow valve is connected to the oil tank.

[0013] The outlet of the first oil pump is provided with a third bypass branch and a fourth bypass branch, the outlet of the second oil pump is provided with a fifth bypass branch, the third bypass branch is connected to the inlet of the second oil pump, and the fourth bypass branch and the fifth bypass branch are connected to the inlet of the third oil pump through a sixth check valve.

[0014] Furthermore, a second check valve is installed on the first bypass branch.

[0015] Furthermore, a return oil branch is provided on the first bypass branch. The return oil branch is installed on the pipeline between the second check valve and the first oil pump. A third check valve is installed on the return oil branch, and the return oil branch is connected to the oil tank.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. This invention has a simple structure and high oil supply efficiency:

[0018] The electric standby lubricating oil pump 1 draws oil directly from the oil tank 100. A portion of the lubricating oil is supplied to the lubrication points in the gearbox 200 through the standby branch, and the other portion of the lubricating oil is supplied to the first oil pump 2 and the second oil pump 3 through the first bypass branch and the second bypass branch, respectively, to avoid vacuuming when the first oil pump 2 and the second oil pump 3 are started.

[0019] When the first oil pump 2, the second oil pump 3, and the third oil pump 4 start operating, the first oil pump 2 replenishes oil to the second oil pump 3 and the third oil pump 4 through the third bypass branch and the fourth bypass branch, respectively. The second oil pump 3 replenishes oil to the third oil pump 4 through the fifth bypass branch, realizing the joint supply of oil to the gearbox 200 by multiple pumps. At the same time, it reduces the oil suction of the second oil pump 3 and the third oil pump 4, reduces the noise of the second oil pump 3 and the third oil pump 4 during operation, and thus reduces the noise of the ship during operation, thereby improving the practicality of the present invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] In the diagram: 100, oil tank; 200, gearbox; 1, electric backup lubricating oil pump; 2, first oil pump; 3, second oil pump; 4, third oil pump; 5, first suction filter; 6, second suction filter; 7, third suction filter; 8, fourth suction filter; 9, first check valve; 10, second check valve; 11, third check valve; 12, fourth check valve; 13, fifth check valve; 14, sixth check valve; 15, double oil filter; 16, overflow valve; 17, three-way automatic temperature regulating valve; 18, plate heat exchanger; 19, orifice plate; 20, seventh check valve; 21, eighth check valve. Detailed Implementation

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described below are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Specific implementation method one: Combining Figure 1 This embodiment describes a multi-pump combined oil supply structure for a diesel-diesel combined propulsion device, which includes a gearbox 200, a first branch, a second branch, a third branch, and a backup branch.

[0024] The backup branch includes a first suction oil filter 5, an electric backup lubricating oil pump 1, an eighth check valve 21, a double oil filter 15, a plate heat exchanger 18, and a three-way automatic temperature regulating valve 17, which are connected in sequence through pipelines. The backup branch is connected to each lubrication point in the gearbox 200.

[0025] The first branch includes a second oil suction filter 6 and a first oil pump 2 connected in sequence by pipelines.

[0026] The second branch includes a third oil suction filter 7 and a second oil pump 3 connected in sequence by pipelines.

[0027] The third branch includes a fourth oil suction filter 8 and a third oil pump 4, which are connected in sequence through pipelines.

[0028] The oil inlets of the first oil suction filter 5, the second oil suction filter 6, the third oil suction filter 7, and the fourth oil suction filter 8 are all connected to the oil tank 100. The outlets of the electric standby lubricating oil pump 1, the first oil pump 2, and the second oil pump 3 are all provided with exhaust pipes connected to the side wall of the gearbox 200. The first branch, the second branch, and the third branch are all connected to the outlet of the eighth one-way valve 21.

[0029] The inlet of the eighth check valve 21 is provided with a first bypass branch and a second bypass branch. The second bypass branch is connected to the inlet of the second oil pump 3, and the first bypass branch is connected to the inlet of the first oil pump 2.

[0030] An overflow valve 16 is installed at the outlet of the eighth check valve 21. The return port of the overflow valve 16 is connected to the oil tank 100. With this configuration, when the lubricating oil pressure in the oil circuit is too high, it overflows to the oil tank 100 through the overflow valve 16 to ensure that the lubricating oil pressure meets the usage requirements.

[0031] The outlet of the first oil pump 2 is provided with a third bypass branch and a fourth bypass branch, and the outlet of the second oil pump 3 is provided with a fifth bypass branch. The third bypass branch is connected to the inlet of the second oil pump 3, and the fourth bypass branch and the fifth bypass branch are connected to the inlet of the third oil pump 4 through the sixth check valve 14.

[0032] In this embodiment, exhaust pipes are provided at the outlets of the electric backup lubricating oil pump 1, the first oil pump 2, and the second oil pump 3. This arrangement facilitates the removal of air drawn in by the electric backup lubricating oil pump 1, the first oil pump 2, and the second oil pump 3 during oil suction.

[0033] In this embodiment, one filter element of the dual oil filter 15 is in operation, while the other filter element is in standby. After the dual oil filter 15 has been in operation for a period of time, when one filter element becomes clogged by dirt in the lubricating oil, the operator switches to the other filter element for use, and the clogged filter element can then be cleaned.

[0034] In this embodiment, the plate heat exchanger 18 can cool the temperature of the lubricating oil.

[0035] In this embodiment, the three-way automatic temperature regulating valve 17 includes an oil inlet valve, an oil outlet valve, and a temperature regulating valve. The oil outlet valve is used to supply oil to the lubrication points in the gearbox 200. The oil inlet valve is connected to the outlet of the plate heat exchanger 18, and the temperature regulating valve is connected to the inlet of the plate heat exchanger 18.

[0036] When the temperature of the lubricating oil is higher than the temperature sensing range of the valve core inside the three-way automatic temperature regulating valve 17, the opening of the temperature regulating valve increases, and the lubricating oil flows back into the plate heat exchanger 18 from the temperature regulating valve for heat exchange. After being cooled by the plate heat exchanger 18, the lubricating oil enters the gearbox 200, ensuring that the lubricating oil temperature meets the usage requirements.

[0037] In this embodiment, the overflow valve 16 is a pilot-operated overflow valve. The remote control port of the overflow valve 16 is connected to the outlet of the three-way automatic temperature regulating valve 17 through a pipeline. This configuration facilitates the adjustment of the oil supply pressure.

[0038] Specific Implementation Method Two: Combining Figure 1 This embodiment describes a second one-way valve 10 installed on the first bypass branch.

[0039] Furthermore, a return oil branch is provided on the first bypass branch. The return oil branch is installed on the pipeline between the second check valve 10 and the first oil pump 2. A third check valve 11 is installed on the return oil branch. The return oil branch is connected to the oil tank 100.

[0040] Other components and connection methods are the same as in Specific Implementation Method 1.

[0041] Specific implementation method three: Combining Figure 1 This embodiment describes a first one-way valve 9 installed on the second bypass branch.

[0042] Furthermore, a seventh check valve 20 is installed on the third bypass branch.

[0043] Furthermore, a fourth one-way valve 12 is installed on the fourth bypass branch.

[0044] Furthermore, a fifth one-way valve 13 is installed on the fifth bypass branch.

[0045] Furthermore, each exhaust pipe is equipped with a throttling orifice plate 19.

[0046] Other components and connection methods are the same as in specific implementation method one or two.

[0047] Working principle

[0048] Before the CODAD device is in operation, start the electric standby lubricating oil pump 1. The electric standby lubricating oil pump 1 draws oil directly from the oil tank 100. Part of the lubricating oil is supplied to the lubrication points in the gearbox 200 through the standby branch, and the other part of the lubricating oil is supplied to the first oil pump 2 and the second oil pump 3 through the first bypass branch and the second bypass branch respectively, so as to avoid the vacuum phenomenon when the first oil pump 2 and the second oil pump 3 are started.

[0049] When the CODAD device reaches a certain speed (e.g., 90 rpm), the first oil pump 2, the second oil pump 3, and the third oil pump 4 start working, and the electric standby lubricating oil pump 1 stops running. At this time, the first oil pump 2 replenishes oil to the second oil pump 3 and the third oil pump 4 through the third bypass branch and the fourth bypass branch, respectively, and the second oil pump 3 replenishes oil to the third oil pump 4 through the fifth bypass branch.

[0050] In subsequent changes in operating conditions, the CODAD device relies on the first oil pump 2, the second oil pump 3, and the third oil pump 4 to supply oil to the various lubrication points in the gearbox 200.

[0051] The present invention has been disclosed above with reference to preferred embodiments, but it is not intended to limit the present invention. Any simple modifications, equivalent changes and alterations made by those skilled in the art to the above embodiments without departing from the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A multi-pump combined fuel supply structure for a diesel-diesel combined propulsion device, comprising a gearbox (200), characterized in that: It also includes the first branch road, the second branch road, the third branch road, and the backup branch road; The backup branch includes a first suction oil filter (5), an electric backup lubricating oil pump (1), an eighth one-way valve (21), a double oil filter (15), a plate heat exchanger (18), and a three-way automatic temperature regulating valve (17) connected in sequence through pipelines. The backup branch is connected to each lubrication point in the gearbox (200). The first branch includes a second oil suction filter (6) and a first oil pump (2) connected in sequence by pipelines; The second branch includes a third oil suction filter (7) and a second oil pump (3) connected in sequence by pipelines; The third branch includes a fourth oil suction filter (8) and a third oil pump (4) connected in sequence by pipelines; The oil inlets of the first oil suction filter (5), the second oil suction filter (6), the third oil suction filter (7), and the fourth oil suction filter (8) are all connected to the oil tank (100). The outlets of the electric standby lubricating oil pump (1), the first oil pump (2), and the second oil pump (3) are all provided with exhaust pipes connected to the side wall of the gearbox (200). The first branch, the second branch, and the third branch are all connected to the outlet of the eighth check valve (21). The inlet of the eighth check valve (21) is provided with a first bypass branch and a second bypass branch. The second bypass branch is connected to the inlet of the second oil pump (3), and the first bypass branch is connected to the inlet of the first oil pump (2). The outlet of the eighth check valve (21) is equipped with an overflow valve (16), and the return port of the overflow valve (16) is connected to the oil tank (100). The outlet of the first oil pump (2) is provided with a third bypass branch and a fourth bypass branch, and the outlet of the second oil pump (3) is provided with a fifth bypass branch. The third bypass branch is connected to the inlet of the second oil pump (3), and the fourth bypass branch and the fifth bypass branch are connected to the inlet of the third oil pump (4) through the sixth check valve (14).

2. The multi-pump combined fuel supply structure for a diesel-diesel combined propulsion device according to claim 1, characterized in that: A second check valve (10) is installed on the first bypass branch.

3. The multi-pump combined fuel supply structure for a diesel-diesel combined propulsion device according to claim 2, characterized in that: A return oil branch is provided on the first bypass branch. The return oil branch is installed on the pipeline between the second check valve (10) and the first oil pump (2). A third check valve (11) is installed on the return oil branch. The return oil branch is connected to the oil tank (100).

4. The multi-pump combined fuel supply structure for a diesel-diesel combined propulsion device according to claim 1, characterized in that: A first check valve (9) is installed on the second bypass branch.

5. The multi-pump combined fuel supply structure for a diesel-diesel combined propulsion device according to claim 1, characterized in that: A seventh check valve (20) is installed on the third bypass branch.

6. The multi-pump combined fuel supply structure for a diesel-diesel combined propulsion device according to claim 1, characterized in that: A fourth check valve (12) is installed on the fourth bypass branch.

7. The multi-pump combined fuel supply structure for a diesel-diesel combined propulsion device according to claim 1, characterized in that: A fifth check valve (13) is installed on the fifth bypass branch.

8. The multi-pump combined fuel supply structure for a diesel-diesel combined propulsion device according to claim 1, characterized in that: Each of the exhaust pipes is equipped with a throttling orifice plate (19).

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