An electric starting conversion circuit system for a marine engine

Abstract

This invention relates to the field of starting circuit technology and discloses an electric starting conversion circuit system for a marine engine, including a first power supply, a second power supply, a third power supply, a fourth power supply, a first starting motor, a second starting motor, a third starting motor, a fourth starting motor, and a first conversion switch, a second conversion switch, a third conversion switch, and a fourth conversion switch; the first power supply and the second power supply are connected to the first conversion switch, and the third power supply and the fourth power supply are connected to the second conversion switch; the first starting motor and the second starting motor are connected to the third conversion switch, and the third starting motor and the fourth starting motor are connected to the fourth conversion switch; the first conversion switch, the second conversion switch, the third conversion switch, and the fourth conversion switch each have a first conduction position, a second conduction position, a third conduction position, and a fourth conduction position, the first conduction position and the second conduction position are simultaneously conducting, the third conduction position and the fourth conduction position are simultaneously conducting, and the conduction positions of the different conversion switches are electrically connected.

Description

Technical Field

[0001] This invention relates to the field of starting circuit technology, and in particular to an electric starting conversion circuit system for a marine engine. Background Technology

[0002] Currently, many ships are typically equipped with four electric start engines, specifically two electric start main engines and two electric start generator sets. Each electric start main engine and electric start generator set is equipped with an independent starting battery to drive the corresponding main engine or generator set to start working.

[0003] In practical operation, if a set of starting batteries fails, the corresponding host or generator set will be unable to start. In order to use the remaining normal starting batteries to start the host or generator set corresponding to the failed starting battery, the current practice is to use a movable cable to temporarily connect the normal starting battery to the starter motor of the corresponding host or generator set, thereby replacing the failed starting battery to achieve the purpose of electric starting.

[0004] However, if the electric starter engines are located in different compartments, the operation of temporarily laying cables becomes difficult. In particular, when the ship is in an emergency, the operation of temporarily laying and splicing cables is time-consuming, the engines cannot be started in time, and there is a risk of incorrect wiring, which can easily lead to ship safety accidents. Summary of the Invention

[0005] The technical problem to be solved by this invention is that if the electric starter engine is located in different compartments, it is difficult to temporarily lay cables. Moreover, when the ship is in an emergency, the operation of temporarily laying and splicing cables takes a long time, the engine cannot be started in time, and there is a risk of incorrect wiring, which can easily cause ship safety accidents.

[0006] To solve the above-mentioned technical problems, the present invention provides a technical solution for an electric starter conversion circuit system for a marine engine:

[0007] The electric start conversion circuit system of the marine engine includes a first power supply, a second power supply, a third power supply, a fourth power supply, a first starter motor, a second starter motor, a third starter motor, a fourth starter motor, and a first conversion switch, a second conversion switch, a third conversion switch, and a fourth conversion switch;

[0008] The first power supply and the second power supply are connected to the first changeover switch; the third power supply and the fourth power supply are connected to the second changeover switch; the first starter motor and the second starter motor are connected to the third changeover switch; the third starter motor and the fourth starter motor are connected to the fourth changeover switch.

[0009] The first changeover switch, the second changeover switch, the third changeover switch, and the fourth changeover switch each have a first conduction position, a second conduction position, a third conduction position, and a fourth conduction position. The first conduction position and the second conduction position are simultaneously turned on, and the third conduction position and the fourth conduction position are simultaneously turned on.

[0010] The first conducting position of the first changeover switch is electrically connected to the first conducting position and the fourth conducting position of the fourth changeover switch, respectively; the fourth conducting position of the first changeover switch is electrically connected to the first conducting position and the fourth conducting position of the fourth changeover switch, respectively.

[0011] The third conducting position of the second changeover switch is electrically connected to the second conducting position and the third conducting position of the third changeover switch, respectively.

[0012] The first conducting position of the third changeover switch is electrically connected to the second conducting position and the third conducting position of the first changeover switch, respectively; and the fourth conducting position of the third changeover switch is electrically connected to the second conducting position and the third conducting position of the first changeover switch, respectively.

[0013] The second conducting position of the fourth changeover switch is electrically connected to the first conducting position and the fourth conducting position of the second changeover switch, respectively, and the third conducting position of the fourth changeover switch is electrically connected to the first conducting position and the fourth conducting position of the second changeover switch, respectively.

[0014] Furthermore, the first changeover switch, the second changeover switch, the third changeover switch, and the fourth changeover switch are all four-pole double-throw knife switches, which include an intermediate terminal group, a first terminal group, a second terminal group, a third terminal group, a fourth terminal group, and a switching knife. The first terminal group and the second terminal group are distributed on one side of the intermediate terminal group, and the third terminal group and the fourth terminal group are distributed on the other side of the intermediate terminal group.

[0015] Furthermore, the first conducting position is formed when the switching switch is electrically connected between the intermediate terminal group and the first terminal group; the second conducting position is formed when the switching switch is electrically connected between the intermediate terminal group and the second terminal group.

[0016] The third conducting position is formed when the switching switch is electrically connected between the intermediate terminal group and the third terminal group, and the fourth conducting position is formed when the switching switch is electrically connected between the intermediate terminal group and the fourth terminal group.

[0017] Furthermore, the first power supply and the second power supply are connected to the intermediate terminal group of the first changeover switch, and the third power supply and the fourth power supply are connected to the intermediate terminal group of the second changeover switch.

[0018] The first starter motor and the second starter motor are connected to the intermediate terminal group of the third changeover switch, and the third starter motor and the fourth starter motor are connected to the intermediate terminal group of the fourth changeover switch.

[0019] Furthermore, the first terminal group of the first changeover switch is connected to the first terminal group of the fourth changeover switch and the fourth terminal group of the fourth changeover switch respectively with wires; the fourth terminal group of the first changeover switch is connected to the first terminal group of the fourth changeover switch and the fourth terminal group of the fourth changeover switch respectively with wires.

[0020] Furthermore, the second terminal group of the second changeover switch is connected to the second terminal group of the third changeover switch and the third terminal group of the third changeover switch respectively with wires; the third terminal group of the second changeover switch is connected to the second terminal group of the third changeover switch and the third terminal group of the third changeover switch respectively with wires.

[0021] Furthermore, the first terminal group of the third changeover switch is connected to the second terminal group and the third terminal group of the first changeover switch respectively with wires; the fourth terminal group of the third changeover switch is connected to the second terminal group and the third terminal group of the first changeover switch respectively with wires.

[0022] Furthermore, the second terminal group of the fourth changeover switch is connected to the first terminal group of the second changeover switch and the fourth terminal group of the second changeover switch respectively with wires; the third terminal group of the fourth changeover switch is connected to the first terminal group of the second changeover switch and the fourth terminal group of the second changeover switch respectively with wires.

[0023] Furthermore, isolating switches are respectively connected between the third changeover switch and the first starter motor, between the third changeover switch and the second starter motor, between the fourth changeover switch and the third starter motor, and between the fourth changeover switch and the fourth starter motor.

[0024] Compared with the prior art, the electric start conversion circuit system for a marine engine of the present invention has the following advantages: the electric start conversion circuit system for a marine engine adopts a design of a first power supply, a second power supply, a third power supply, a fourth power supply, a first starter motor, a second starter motor, a third starter motor, a fourth starter motor, a first conversion switch, a second conversion switch, a third conversion switch, and a fourth conversion switch. The first power supply and the second power supply are connected to the first conversion switch; the third power supply and the fourth power supply are connected to the second conversion switch; the first starter motor and the second starter motor are connected to the third conversion switch; and the third starter motor and the fourth starter motor are connected to the fourth conversion switch.

[0025] Furthermore, the first, second, third, and fourth changeover switches each have a first, second, third, and fourth conducting position. The first and second conducting positions are simultaneously active, as are the third and fourth conducting positions. In use, the four changeover switches are operated to their respective conducting positions, ensuring that each power source supplies power to only one starter motor. For example, if the first, second, third, and fourth changeover switches are all simultaneously in the first and second conducting positions, then the first power source supplies power only to the third starter motor, the second power source supplies power only to the first starter motor, the third power source supplies power only to the fourth starter motor, and the fourth power source supplies power only to the second starter motor.

[0026] Alternatively, if the first and second changeover switches are both in the first and second conducting positions, and the third and fourth changeover switches are both in the third and fourth conducting positions, then the first power supply supplies power only to the fourth starter motor, the second power supply supplies power only to the second starter motor, the third power supply supplies power only to the third starter motor, and the fourth power supply supplies power only to the first starter motor.

[0027] Alternatively, if the first and third transfer switches are both in the first and second conducting positions, and the second and fourth transfer switches are both in the third and fourth conducting positions, then the first power supply supplies power only to the fourth starter motor, the second power supply supplies power only to the first starter motor, the third power supply supplies power only to the second starter motor, and the fourth power supply supplies power only to the third starter motor.

[0028] Alternatively, if the first and fourth changeover switches are both in the first and second conducting positions, and the second and third changeover switches are both in the third and fourth conducting positions, then the first power supply supplies power only to the third starter motor, the second power supply supplies power only to the second starter motor, the third power supply supplies power only to the first starter motor, and the fourth power supply supplies power only to the fourth starter motor.

[0029] Alternatively, if the first, second, third, and fourth transfer switches are all simultaneously in the third and fourth conduction positions, then the first power supply will only supply power to the second starter motor, the second power supply will only supply power to the fourth starter motor, the third power supply will only supply power to the first starter motor, and the fourth power supply will only supply power to the third starter motor.

[0030] Alternatively, if both the first and second changeover switches are in the third and fourth conducting positions, and both the third and fourth changeover switches are in the first and second conducting positions, then the first power supply supplies power only to the first starter motor, the second power supply supplies power only to the third starter motor, the third power supply supplies power only to the second starter motor, and the fourth power supply supplies power only to the fourth starter motor.

[0031] Similarly, based on the principle of permutations and combinations, by controlling the four selector switches to different conduction positions, any combination of four power supplies and four starter motors can be achieved, and each starter motor can be started by any power supply. The cables between the four selector switches can be laid in advance, avoiding the difficulties of temporary cable laying when the electrically started engines are located in different compartments. In particular, in emergency situations, this effectively shortens the electric starting time of the engines, eliminates the risk of incorrect wiring, and prevents potential ship safety accidents. Attached Figure Description

[0032] Figure 1 This is a circuit diagram of the electric start conversion circuit system of a ship engine in an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the first changeover switch in an embodiment of the present invention;

[0034] In the diagram: 11-First power supply, 12-Second power supply, 13-Third power supply, 14-Fourth power supply, 21-First starter motor, 22-Second starter motor, 23-Third starter motor, 24-Fourth starter motor, 25-Isolating switch, 31-First changeover switch, 32-Second changeover switch, 33-Third changeover switch, 34-Fourth changeover switch, 40-Intermediate terminal group, 41-First terminal group, 42-Second terminal group, 43-Third terminal group, 44-Fourth terminal group, 45-Switching switch. Detailed Implementation

[0035] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" used to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] like Figure 1 , Figure 2 As shown, an embodiment of the present invention provides an electric starter conversion circuit system for a marine engine, comprising a first power supply 11, a second power supply 12, a third power supply 13, a fourth power supply 14, a first starter motor 21, a second starter motor 22, a third starter motor 23, a fourth starter motor 24, and a first conversion switch 31, a second conversion switch 32, a third conversion switch 33, and a fourth conversion switch 34; the first power supply 11 and the second power supply 12 are connected to the first conversion switch 31, the third power supply 13 and the fourth power supply 14 are connected to the second conversion switch 32; the first starter motor 21 and the second starter motor 22 are connected to the third conversion switch 33, and the third starter motor 23 and the fourth starter motor 24 are connected to the fourth conversion switch 34.

[0040] The first changeover switch 31, the second changeover switch 32, the third changeover switch 33, and the fourth changeover switch 34 each have a first conducting position, a second conducting position, a third conducting position, and a fourth conducting position. The first conducting position and the second conducting position are simultaneously conducting, and the third conducting position and the fourth conducting position are simultaneously conducting. The first conducting position of the first changeover switch 31 is electrically connected to the first conducting position and the fourth conducting position of the fourth changeover switch 34, respectively; the fourth conducting position of the first changeover switch 31 is electrically connected to the first conducting position and the fourth conducting position of the fourth changeover switch 34, respectively; the third conducting position of the second changeover switch 32 is electrically connected to the second conducting position and the third conducting position of the third changeover switch 33, respectively; the second conducting position of the second changeover switch 32 is electrically connected to the second conducting position and the third conducting position of the third changeover switch 33, respectively.

[0041] The first conducting position of the third changeover switch 33 is electrically connected to the second conducting position and the third conducting position of the first changeover switch 31, respectively; the fourth conducting position of the third changeover switch 33 is electrically connected to the second conducting position and the third conducting position of the first changeover switch 31, respectively; the second conducting position of the fourth changeover switch 34 is electrically connected to the first conducting position and the fourth conducting position of the second changeover switch 32, respectively; the third conducting position of the fourth changeover switch 34 is electrically connected to the first conducting position and the fourth conducting position of the second changeover switch 32, respectively.

[0042] The electric starter conversion circuit system of the ship's engine adopts a design consisting of a first power supply 11, a second power supply 12, a third power supply 13, a fourth power supply 14, a first starter motor 21, a second starter motor 22, a third starter motor 23, a fourth starter motor 24, a first conversion switch 31, a second conversion switch 32, a third conversion switch 33, and a fourth conversion switch 34. Specifically, the first power supply 11 and the second power supply 12 are connected to the first conversion switch 31, the third power supply 13 and the fourth power supply 14 are connected to the second conversion switch 32, the first starter motor 21 and the second starter motor 22 are connected to the third conversion switch 33, and the third starter motor 23 and the fourth starter motor 24 are connected to the fourth conversion switch 34.

[0043] Furthermore, the first changeover switch 31, the second changeover switch 32, the third changeover switch 33, and the fourth changeover switch 34 each have a first conducting position, a second conducting position, a third conducting position, and a fourth conducting position. The first conducting position and the second conducting position are simultaneously activated, and the third conducting position and the fourth conducting position are simultaneously activated. In use, the four changeover switches are operated to adjust to their respective conducting positions so that each power supply supplies power to only one starter motor. For example, if the first changeover switch 31, the second changeover switch 32, the third changeover switch 33, and the fourth changeover switch 34 are all simultaneously in the first conducting position and the second conducting position, then the first power supply 11 supplies power only to the third starter motor 23, the second power supply 12 supplies power only to the first starter motor 21, the third power supply 13 supplies power only to the fourth starter motor 24, and the fourth power supply 14 supplies power only to the second starter motor 22.

[0044] Alternatively, if the first switch 31 and the second switch 32 are both in the first and second conducting positions, and the third switch 33 and the fourth switch 34 are both in the third and fourth conducting positions, then the first power supply 11 supplies power only to the fourth starter motor 24, the second power supply 12 supplies power only to the second starter motor 22, the third power supply 13 supplies power only to the third starter motor 23, and the fourth power supply 14 supplies power only to the first starter motor 21.

[0045] Alternatively, if the first switch 31 and the third switch 33 are both in the first and second conducting positions, and the second switch 32 and the fourth switch 34 are both in the third and fourth conducting positions, then the first power supply 11 supplies power only to the fourth starter motor 24, the second power supply 12 supplies power only to the first starter motor 21, the third power supply 13 supplies power only to the second starter motor 22, and the fourth power supply 14 supplies power only to the third starter motor 23.

[0046] Alternatively, if the first switch 31 and the fourth switch 34 are both in the first and second conducting positions, and the second switch 32 and the third switch 33 are both in the third and fourth conducting positions, then the first power supply 11 supplies power only to the third starter motor 23, the second power supply 12 supplies power only to the second starter motor 22, the third power supply 13 supplies power only to the first starter motor 21, and the fourth power supply 14 supplies power only to the fourth starter motor 24.

[0047] Alternatively, if the first changeover switch 31, the second changeover switch 32, the third changeover switch 33, and the fourth changeover switch 34 are all simultaneously in the third and fourth conduction positions, then the first power supply 11 supplies power only to the second starter motor 22, the second power supply 12 supplies power only to the fourth starter motor 24, the third power supply 13 supplies power only to the first starter motor 21, and the fourth power supply 14 supplies power only to the third starter motor 23.

[0048] Alternatively, if the first switch 31 and the second switch 32 are both in the third and fourth conducting positions, and the third switch 33 and the fourth switch 34 are both in the first and second conducting positions, then the first power supply 11 supplies power only to the first starter motor 21, the second power supply 12 supplies power only to the third starter motor 23, the third power supply 13 supplies power only to the second starter motor 22, and the fourth power supply 14 supplies power only to the fourth starter motor 24.

[0049] Similarly, based on the principle of permutations and combinations, by controlling the four selector switches to different conduction positions, any combination of four power supplies and four starter motors can be achieved, and each starter motor can be started by any power supply. The cables between the four selector switches can be laid in advance, avoiding the difficulties of temporary cable laying when the electrically started engines are located in different compartments. In particular, in emergency situations, this effectively shortens the electric starting time of the engines, eliminates the risk of incorrect wiring, and prevents potential ship safety accidents.

[0050] In this embodiment, the first changeover switch 31, the second changeover switch 32, the third changeover switch 33, and the fourth changeover switch 34 are all four-pole double-throw knife switches, such as... Figure 2 As shown, it includes an intermediate terminal group 40, a first terminal group 41, a second terminal group 42, a third terminal group 43, a fourth terminal group 44, and a switching switch 45. The first terminal group 41 and the second terminal group 42 are distributed on one side of the intermediate terminal group 40, and the third terminal group 43 and the fourth terminal group 44 are distributed on the other side of the intermediate terminal group 40.

[0051] It should be noted that the switching switch 45 is in a first conducting position when it is electrically connected between the intermediate terminal group 40 and the first terminal group 41; in a second conducting position when it is electrically connected between the intermediate terminal group 40 and the second terminal group 42; in a third conducting position when it is electrically connected between the intermediate terminal group 40 and the third terminal group 43; and in a fourth conducting position when it is electrically connected between the intermediate terminal group 40 and the fourth terminal group 44.

[0052] The first power supply 11 and the second power supply 12 are connected to the intermediate terminal group 40 of the first changeover switch 31; the third power supply 13 and the fourth power supply 14 are connected to the intermediate terminal group 40 of the second changeover switch 32; the first starter motor 21 and the second starter motor 22 are connected to the intermediate terminal group 40 of the third changeover switch 33; and the third starter motor 23 and the fourth starter motor 24 are connected to the intermediate terminal group 40 of the fourth changeover switch 34.

[0053] Taking the first changeover switch 31 as an example, the intermediate terminal group 40 has two sets of positive and negative terminals. The first power supply 11 can be connected to one set of positive and negative terminals of the intermediate terminal group 40, and the second power supply 12 can be connected to the other set of positive and negative terminals of the intermediate terminal group 40. The first terminal group 41, the second terminal group 42, the third terminal group 43, and the fourth terminal group 44 are all sets of positive and negative terminals. The first terminal group 41 and the fourth terminal group 44 can be electrically connected to the fourth changeover switch 34, and the second terminal group 42 and the third terminal group 43 can be electrically connected to the third changeover switch 33.

[0054] In this embodiment, the first terminal group 41 of the first changeover switch 31 is connected with wires to the first terminal group 41 and the fourth terminal group 44 of the fourth changeover switch 34, respectively; the fourth terminal group 44 of the first changeover switch 31 is connected with wires to the first terminal group 41 and the fourth terminal group 44 of the fourth changeover switch 34, respectively. Furthermore, the second terminal group 42 of the second changeover switch 32 is connected with wires to the second terminal group 42 and the third terminal group 43 of the third changeover switch 33, respectively; the third terminal group 43 of the second changeover switch 32 is connected with wires to the second terminal group 42 and the third terminal group 43 of the third changeover switch 33, respectively.

[0055] Meanwhile, the first terminal group 41 of the third changeover switch 33 is connected with wires to the second terminal group 42 and the third terminal group 43 of the first changeover switch 31, respectively; the fourth terminal group 44 of the third changeover switch 33 is connected with wires to the second terminal group 42 and the third terminal group 43 of the first changeover switch 31, respectively. The second terminal group 42 of the fourth changeover switch 34 is connected with wires to the first terminal group 41 and the fourth terminal group 44 of the second changeover switch 32, respectively; the third terminal group 43 of the fourth changeover switch 34 is connected with wires to the first terminal group 41 and the fourth terminal group 44 of the second changeover switch 32, respectively.

[0056] In addition, isolating switches 25 are connected between the third changeover switch 33 and the first starter motor 21, between the third changeover switch 33 and the second starter motor 22, between the fourth changeover switch 34 and the third starter motor 23, and between the fourth changeover switch 34 and the fourth starter motor 24. It is precisely because isolating switches 25 are installed on the starter motor circuit that the power supply and engine can be disconnected during engine shutdown, thereby ensuring maintenance safety.

[0057] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An electric starter conversion circuit system for a marine engine, characterized in that, It includes a first power supply, a second power supply, a third power supply, a fourth power supply, a first starter motor, a second starter motor, a third starter motor, a fourth starter motor, and a first changeover switch, a second changeover switch, a third changeover switch, and a fourth changeover switch; The first power supply and the second power supply are connected to the first changeover switch; the third power supply and the fourth power supply are connected to the second changeover switch; the first starter motor and the second starter motor are connected to the third changeover switch; the third starter motor and the fourth starter motor are connected to the fourth changeover switch. The first changeover switch, the second changeover switch, the third changeover switch, and the fourth changeover switch each have a first conduction position, a second conduction position, a third conduction position, and a fourth conduction position. The first conduction position and the second conduction position are simultaneously turned on, and the third conduction position and the fourth conduction position are simultaneously turned on. The first changeover switch, the second changeover switch, the third changeover switch, and the fourth changeover switch are all four-pole double-throw knife switches, which include an intermediate terminal group, a first terminal group, a second terminal group, a third terminal group, a fourth terminal group, and a switching knife. The first terminal group and the second terminal group are distributed on one side of the intermediate terminal group, and the third terminal group and the fourth terminal group are distributed on the other side of the intermediate terminal group. The first conducting position is formed when the switching switch is electrically connected between the intermediate terminal group and the first terminal group; the second conducting position is formed when the switching switch is electrically connected between the intermediate terminal group and the second terminal group. The third conducting position is formed when the switching switch is electrically connected between the intermediate terminal group and the third terminal group, and the fourth conducting position is formed when the switching switch is electrically connected between the intermediate terminal group and the fourth terminal group. The first power supply and the second power supply are connected to the intermediate terminal group of the first changeover switch, and the third power supply and the fourth power supply are connected to the intermediate terminal group of the second changeover switch. The first starter motor and the second starter motor are connected to the intermediate terminal group of the third changeover switch, and the third starter motor and the fourth starter motor are connected to the intermediate terminal group of the fourth changeover switch.

2. The electric starter conversion circuit system for a marine engine according to claim 1, characterized in that, The first terminal group of the first changeover switch is connected to the first terminal group of the fourth changeover switch and the fourth terminal group of the fourth changeover switch respectively with wires; the fourth terminal group of the first changeover switch is connected to the first terminal group of the fourth changeover switch and the fourth terminal group of the fourth changeover switch respectively with wires.

3. The electric starter conversion circuit system for a marine engine according to claim 2, characterized in that, The second terminal group of the second changeover switch is connected to the second terminal group of the third changeover switch and the third terminal group of the third changeover switch respectively with wires; the third terminal group of the second changeover switch is connected to the second terminal group of the third changeover switch and the third terminal group of the third changeover switch respectively with wires.

4. The electric starter conversion circuit system for a marine engine according to claim 3, characterized in that, The first terminal group of the third changeover switch is connected to the second terminal group and the third terminal group of the first changeover switch respectively with wires; the fourth terminal group of the third changeover switch is connected to the second terminal group and the third terminal group of the first changeover switch respectively with wires.

5. The electric starter conversion circuit system for a marine engine according to claim 4, characterized in that, The second terminal group of the fourth changeover switch is connected to the first terminal group of the second changeover switch and the fourth terminal group of the second changeover switch respectively with wires; the third terminal group of the fourth changeover switch is connected to the first terminal group of the second changeover switch and the fourth terminal group of the second changeover switch respectively with wires.

6. The electric starter conversion circuit system for a marine engine according to claim 1, characterized in that, Isolating switches are respectively connected between the third changeover switch and the first starter motor, between the third changeover switch and the second starter motor, between the fourth changeover switch and the third starter motor, and between the fourth changeover switch and the fourth starter motor.

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