Electric starting conversion circuit system of ship engine

Abstract

The invention relates to the technical field of starting circuits, and discloses an electric starting switching circuit system of a ship engine, which comprises 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 and a fourth starting 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 with the first change-over switch; the third power supply and the fourth power supply are connected with the second change-over switch; the first starting motor and the second starting motor are connected with a third change-over switch; the third starting motor and the fourth starting motor are connected with a fourth change-over switch; the first change-over switch, the second change-over switch, the third change-over switch and the fourth change-over switch are respectively provided with 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 conducted at the same time, the third conduction position and the fourth conduction position are conducted at the same time, and the conduction positions of different change-over switches are electrically connected.

Description

Technical Field

[0001] The invention relates to the technical field of starting circuits, and in particular to an electric starting conversion circuit system for a ship engine. Background Art

[0002] At present, many ships are usually 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 a set of independent starting batteries to drive the corresponding main engine or generator set to start working.

[0003] In actual work, a certain group of starting batteries may fail, and the corresponding host or generator set cannot be started. In order to use the remaining normal starting batteries to start the host or generator set corresponding to the faulty starting battery, the existing practice is to use a movable cable to temporarily connect the normal starting battery to the starting motor of the corresponding host or generator set, thereby replacing the faulty starting battery to achieve the purpose of electric starting.

[0004] However, if the electric starter engine is arranged in different cabins, the operation of temporarily laying cables is difficult. In particular, 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 connecting the wrong cables, which can easily cause ship safety accidents. Summary of the invention

[0005] The technical problem to be solved by the present invention is: if the electric starting engine is arranged in different cabins, the operation of temporarily laying cables is difficult, and when the ship is in an emergency situation, the operation of temporarily laying and splicing cables is time-consuming, the engine cannot be started in time, and there is a risk of wrong wiring, which can easily cause ship safety accidents.

[0006] In order to solve the above technical problems, the present invention provides a technical solution of an electric starting conversion circuit system for a ship engine:

[0007] The electric starting conversion circuit system of the ship 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 conversion switch, and 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;

[0009] The first conversion switch, the second conversion switch, the third conversion switch and the fourth conversion switch all 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 turned on simultaneously, and the third conduction position and the fourth conduction position are turned on simultaneously;

[0010] The first conduction position of the first conversion switch is electrically connected to the first conduction position and the fourth conduction position of the fourth conversion switch respectively, and the fourth conduction position of the first conversion switch is electrically connected to the first conduction position and the fourth conduction position of the fourth conversion switch respectively;

[0011] The third conduction position of the second conversion switch is electrically connected to the second conduction position and the third conduction position of the third conversion switch respectively, and the second conduction position of the second conversion switch is electrically connected to the second conduction position and the third conduction position of the third conversion switch respectively;

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

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

[0014] Furthermore, the first conversion switch, the second conversion switch, the third conversion switch and the fourth conversion 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, when the switch knife is electrically connected between the intermediate terminal group and the first terminal group, the first conduction position is formed; when the switch knife is electrically connected between the intermediate terminal group and the second terminal group, the second conduction position is formed;

[0016] The third conduction position is formed when the switch blade is electrically connected between the middle terminal group and the third terminal group, and the fourth conduction position is formed when the switch blade is electrically connected between the middle 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 conversion switch, and the third power supply and the fourth power supply are connected to the intermediate terminal group of the second conversion switch;

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

[0019] Furthermore, a wire is connected between the first terminal group of the first conversion switch and the first terminal group of the fourth conversion switch and the fourth terminal group of the fourth conversion switch respectively; a wire is connected between the fourth terminal group of the first conversion switch and the first terminal group of the fourth conversion switch and the fourth terminal group of the fourth conversion switch respectively.

[0020] Furthermore, a wire is connected between the second terminal group of the second conversion switch and the second terminal group of the third conversion switch and the third terminal group of the third conversion switch respectively; a wire is connected between the third terminal group of the second conversion switch and the second terminal group of the third conversion switch and the third terminal group of the third conversion switch respectively.

[0021] Furthermore, wires are connected between the first terminal group of the third conversion switch and the second terminal group of the first conversion switch and the third terminal group of the first conversion switch respectively; and wires are connected between the fourth terminal group of the third conversion switch and the second terminal group of the first conversion switch and the third terminal group of the first conversion switch respectively.

[0022] Furthermore, a wire is connected between the second terminal group of the fourth conversion switch and the first terminal group of the second conversion switch and the fourth terminal group of the second conversion switch respectively; a wire is connected between the third terminal group of the fourth conversion switch and the first terminal group of the second conversion switch and the fourth terminal group of the second conversion switch respectively.

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

[0024] Compared with the prior art, the electric starting conversion circuit system of a ship engine of the present invention has the beneficial effect that: the electric starting conversion circuit system of the ship engine adopts a design form 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, wherein 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 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 conversion switch, the second conversion switch, the third conversion switch and the fourth conversion switch all 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 conducted, and the third conduction position and the fourth conduction position are simultaneously conducted. When in use, the four conversion switches are respectively adjusted to the corresponding conduction positions so that each power supply only supplies power to one starter motor. For example, if the first conversion switch, the second conversion switch, the third conversion switch and the fourth conversion switch are all in the first conduction position and the second conduction position at the same time, the first power supply only supplies power to the third starter motor, the second power supply only supplies power to the first starter motor, the third power supply only supplies power to the fourth starter motor, and the fourth power supply only supplies power to the second starter motor.

[0026] Alternatively, the first conversion switch and the second conversion switch are both in the first conduction position and the second conduction position, and the third conversion switch and the fourth conversion switch are both in the third conduction position and the fourth conduction position, then the first power supply only supplies power to the fourth starter motor, the second power supply only supplies power to the second starter motor, the third power supply only supplies power to the third starter motor, and the fourth power supply only supplies power to the first starter motor.

[0027] Alternatively, the first conversion switch and the third conversion switch are both in the first conduction position and the second conduction position, and the second conversion switch and the fourth conversion switch are both in the third conduction position and the fourth conduction position, then the first power supply only supplies power to the fourth starter motor, the second power supply only supplies power to the first starter motor, the third power supply only supplies power to the second starter motor, and the fourth power supply only supplies power to the third starter motor.

[0028] Alternatively, the first conversion switch and the fourth conversion switch are both in the first conduction position and the second conduction position, and the second conversion switch and the third conversion switch are both in the third conduction position and the fourth conduction position, then the first power supply only supplies power to the third starter motor, the second power supply only supplies power to the second starter motor, the third power supply only supplies power to the first starter motor, and the fourth power supply only supplies power to the fourth starter motor.

[0029] Alternatively, the first conversion switch, the second conversion switch, the third conversion switch, and the fourth conversion switch are all in the third conduction position and the fourth conduction position at the same time, then the first power supply only supplies power to the second starter motor, the second power supply only supplies power to the fourth starter motor, the third power supply only supplies power to the first starter motor, and the fourth power supply only supplies power to the third starter motor.

[0030] Alternatively, the first conversion switch and the second conversion switch are both in the third conduction position and the fourth conduction position, and the third conversion switch and the fourth conversion switch are both in the first conduction position and the second conduction position, then the first power supply only supplies power to the first starter motor, the second power supply only supplies power to the third starter motor, the third power supply only supplies power to the second starter motor, and the fourth power supply only supplies power to the fourth starter motor.

[0031] By analogy, according to the principle of permutation and combination, by controlling the four conversion switches to adjust to different conduction positions, the purpose of any permutation and combination of four power supplies and four starter motors can be achieved, and each starter motor can be powered and started with the help of any power supply. The cables between the four conversion switches can be laid in advance to avoid the difficulty of temporary cable laying due to the electric start engines being arranged in different cabins. In particular, when the ship is in an emergency, the electric start time of the engine is effectively shortened, the risk of wrong wiring is eliminated, and possible ship safety accidents are prevented. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0033] Figure 2 is a schematic structural diagram of a first conversion switch in an embodiment of the present invention;

[0034] In the figure: 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 transfer switch, 32-second transfer switch, 33-third transfer switch, 34-fourth transfer switch, 40-middle terminal group, 41-first terminal group, 42-second terminal group, 43-third terminal group, 44-fourth terminal group, 45-switching knife. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] like Figure 1 , Figure 2 As shown, an electric starting conversion circuit system of a ship engine according to an embodiment of the present invention includes 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, and 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 conversion switch 31, the second conversion switch 32, the third conversion switch 33 and the fourth conversion switch 34 all 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 conducted, and the third conduction position and the fourth conduction position are simultaneously conducted. The first conduction position of the first conversion switch 31 is electrically connected to the first conduction position and the fourth conduction position of the fourth conversion switch 34, respectively, and the fourth conduction position of the first conversion switch 31 is electrically connected to the first conduction position and the fourth conduction position of the fourth conversion switch 34, respectively; the third conduction position of the second conversion switch 32 is electrically connected to the second conduction position and the third conduction position of the third conversion switch 33, respectively, and the second conduction position of the second conversion switch 32 is electrically connected to the second conduction position and the third conduction position of the third conversion switch 33, respectively;

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

[0042] The electric starting conversion circuit system of the ship engine adopts a design form 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, wherein the first power supply 11 and the second power supply 12 are connected to the first conversion switch 31, and 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 conversion switch 31, the second conversion switch 32, the third conversion switch 33 and the fourth conversion switch 34 all 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 conducted, and the third conduction position and the fourth conduction position are simultaneously conducted. When in use, the four conversion switches are respectively adjusted to the corresponding conduction positions so that each power supply only supplies power to one starter motor. For example, the first conversion switch 31, the second conversion switch 32, the third conversion switch 33 and the fourth conversion switch 34 are all in the first conduction position and the second conduction position at the same time, then the first power supply 11 only supplies power to the third starter motor 23, the second power supply 12 only supplies power to the first starter motor 21, the third power supply 13 only supplies power to the fourth starter motor 24, and the fourth power supply 14 only supplies power to the second starter motor 22.

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

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

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

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

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

[0049] By analogy, according to the principle of permutation and combination, by controlling the four conversion switches to adjust to different conduction positions, the purpose of any permutation and combination of four power supplies and four starter motors can be achieved, and each starter motor can be powered and started with the help of any power supply. The cables between the four conversion switches can be laid in advance to avoid the difficulty of temporary cable laying due to the electric start engines being arranged in different cabins. In particular, when the ship is in an emergency, the electric start time of the engine is effectively shortened, the risk of wrong wiring is eliminated, and possible ship safety accidents are prevented.

[0050] In this embodiment, the first conversion switch 31, the second conversion switch 32, the third conversion switch 33 and the fourth conversion switch 34 are all four-pole double-throw knife switches. 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 knife 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 when the switching knife 45 is electrically connected between the intermediate terminal group 40 and the first terminal group 41, it constitutes the first conduction position; when the switching knife 45 is electrically connected between the intermediate terminal group 40 and the second terminal group 42, it constitutes the second conduction position; when the switching knife 45 is electrically connected between the intermediate terminal group 40 and the third terminal group 43, it constitutes the third conduction position; when the switching knife 45 is electrically connected between the intermediate terminal group 40 and the fourth terminal group 44, it constitutes the fourth conduction position.

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

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

[0054] In this embodiment, a wire is connected between the first terminal group 41 of the first conversion switch 31 and the first terminal group 41 of the fourth conversion switch 34 and the fourth terminal group 44 of the fourth conversion switch 34 respectively; a wire is connected between the fourth terminal group 44 of the first conversion switch 31 and the first terminal group 41 of the fourth conversion switch 34 and the fourth terminal group 44 of the fourth conversion switch 34 respectively. In addition, a wire is connected between the second terminal group 42 of the second conversion switch 32 and the second terminal group 42 of the third conversion switch 33 and the third terminal group 43 of the third conversion switch 33 respectively; a wire is connected between the third terminal group 43 of the second conversion switch 32 and the second terminal group 42 of the third conversion switch 33 and the third terminal group 43 of the third conversion switch 33 respectively.

[0055] At the same time, the first terminal group 41 of the third conversion switch 33 is connected with the second terminal group 42 of the first conversion switch 31 and the third terminal group 43 of the first conversion switch 31 by wires; the fourth terminal group 44 of the third conversion switch 33 is connected with the second terminal group 42 of the first conversion switch 31 and the third terminal group 43 of the first conversion switch 31 by wires. The second terminal group 42 of the fourth conversion switch 34 is connected with the first terminal group 41 of the second conversion switch 32 and the fourth terminal group 44 of the second conversion switch 32 by wires; the third terminal group 43 of the fourth conversion switch 34 is connected with the first terminal group 41 of the second conversion switch 32 and the fourth terminal group 44 of the second conversion switch 32 by wires.

[0056] In addition, isolating switches 25 are respectively connected between the third conversion switch 33 and the first starter motor 21, between the third conversion switch 33 and the second starter motor 22, between the fourth conversion switch 34 and the third starter motor 23, and between the fourth conversion switch 34 and the fourth starter motor 24. The isolating switches 25 are provided on the circuit of the starter motor, and the power supply and the engine can be disconnected during the engine shutdown, thereby ensuring the safety of maintenance.

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An electric starting conversion circuit system for a ship engine, characterized in that: The invention comprises 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; 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 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; The first conversion switch, the second conversion switch, the third conversion switch and the fourth conversion switch all 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 turned on simultaneously, and the third conduction position and the fourth conduction position are turned on simultaneously; The first conduction position of the first conversion switch is electrically connected to the first conduction position and the fourth conduction position of the fourth conversion switch respectively, and the fourth conduction position of the first conversion switch is electrically connected to the first conduction position and the fourth conduction position of the fourth conversion switch respectively; The third conduction position of the second conversion switch is electrically connected to the second conduction position and the third conduction position of the third conversion switch respectively, and the second conduction position of the second conversion switch is electrically connected to the second conduction position and the third conduction position of the third conversion switch respectively; The first conduction position of the third conversion switch is electrically connected to the second conduction position and the third conduction position of the first conversion switch respectively, and the fourth conduction position of the third conversion switch is electrically connected to the second conduction position and the third conduction position of the first conversion switch respectively; The second conduction position of the fourth conversion switch is electrically connected to the first conduction position and the fourth conduction position of the second conversion switch respectively, and the third conduction position of the fourth conversion switch is electrically connected to the first conduction position and the fourth conduction position of the second conversion switch respectively.

2. The electric starting conversion circuit system for a ship engine according to claim 1, characterized in that: The first conversion switch, the second conversion switch, the third conversion switch and the fourth conversion 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.

3. The electric starting conversion circuit system of a ship engine according to claim 2, characterized in that When the switch knife is electrically connected between the intermediate terminal group and the first terminal group, the first conduction position is formed; when the switch knife is electrically connected between the intermediate terminal group and the second terminal group, the second conduction position is formed; The third conduction position is formed when the switch blade is electrically connected between the middle terminal group and the third terminal group, and the fourth conduction position is formed when the switch blade is electrically connected between the middle terminal group and the fourth terminal group.

4. The electric starting conversion circuit system for a ship engine according to claim 2 or 3, characterized in that: The first power source and the second power source are connected to the intermediate terminal group of the first conversion switch, and the third power source and the fourth power source are connected to the intermediate terminal group of the second conversion switch; The first starter motor and the second starter motor are connected to the middle terminal group of the third conversion switch, and the third starter motor and the fourth starter motor are connected to the middle terminal group of the fourth conversion switch.

5. The electric starting conversion circuit system for a ship engine according to claim 4, characterized in that: A wire is connected between the first terminal group of the first conversion switch and the first terminal group of the fourth conversion switch and the fourth terminal group of the fourth conversion switch respectively; a wire is connected between the fourth terminal group of the first conversion switch and the first terminal group of the fourth conversion switch and the fourth terminal group of the fourth conversion switch respectively.

6. The electric starting conversion circuit system for a ship engine according to claim 5, characterized in that: The second terminal group of the second conversion switch is respectively connected to the second terminal group of the third conversion switch and the third terminal group of the third conversion switch by wires; the third terminal group of the second conversion switch is respectively connected to the second terminal group of the third conversion switch and the third terminal group of the third conversion switch by wires.

7. The electric starting conversion circuit system for a ship engine according to claim 6, characterized in that: A wire is connected between the first terminal group of the third conversion switch and the second terminal group of the first conversion switch and the third terminal group of the first conversion switch respectively; a wire is connected between the fourth terminal group of the third conversion switch and the second terminal group of the first conversion switch and the third terminal group of the first conversion switch respectively.

8. The electric starting conversion circuit system for a ship engine according to claim 7, characterized in that: A wire is connected between the second terminal group of the fourth conversion switch and the first terminal group of the second conversion switch and the fourth terminal group of the second conversion switch respectively; a wire is connected between the third terminal group of the fourth conversion switch and the first terminal group of the second conversion switch and the fourth terminal group of the second conversion switch respectively.

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

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