An interlocking start-up control system for the bow thruster fan, air damper, and thruster.

Abstract

This utility model discloses an interlocking start-up control system for the bow thruster blower, airlock, and thruster assembly. When the blower experiences overload or power failure, the blower protector activates, de-energizing the second intermediate relay coil. Its normally open contact opens to shut down the airlock and blower. Since the thruster contactor coil remains energized through its self-locking contact, the bow thruster continues to operate, unaffected by the blower failure. This fault-tolerant design avoids the problem of auxiliary equipment failure directly causing main propulsion failure, significantly improving the reliability and safety of ship maneuvering. Automatic blower shutdown in case of airlock failure protects equipment safety: If the airlock closes unexpectedly due to a fault, the limit switch disconnects, de-energizing the fourth intermediate relay coil. Its normally open contact opens, cutting off the power supply to the blower contactor coil, automatically stopping the thruster blower. This protection mechanism prevents equipment damage caused by the blower running idle without cooling when the airlock is closed, extending the blower's service life.

Description

Technical Field

[0001] This utility model relates to the field of ship propulsion control technology, and in particular to an interlocking start-up control system for a bow thruster fan, airlock and thrust device. Background Technology

[0002] The bow thruster, as a ship's propulsion device, generates lateral thrust to control the ship's direction, enabling it to move laterally, turn, or maintain balance. Since it is typically located in the thruster compartment, the thruster compartment fan and damper must be turned on for cooling before it can be activated.

[0003] Traditionally, the thruster and the side thruster are interlocked, meaning the side thruster can only be started when the side thruster is running (with the airlock open). First, the crew must manually open the airlock, then start the side thruster. After the blower starts, it sends an operating signal to the side thruster unit, at which point the side thruster can be started. If the airlock malfunctions and does not open, the side thruster cannot be started. If the side thruster malfunctions, it sends a fault signal to the side thruster unit, at which point the side thruster cannot be started. The process is cumbersome, and a blower malfunction will render the side thruster inoperable, affecting the safety of ship maneuvering.

[0004] The bow thruster, as a ship's propulsion device, generates lateral thrust to control the ship's direction, enabling lateral movement, turning, or maintaining balance. Since the bow thruster is usually located in an enclosed thruster compartment, the thruster compartment fan and air damper must be turned on before starting to ensure heat dissipation and ventilation.

[0005] In existing technology, the side thruster blower, airlock, and side thruster are controlled by a strict interlocking logic: the crew must manually open the airlock first, then start the side thruster blower, and only after the blower's operating signal is fed back to the side thruster unit can the side thruster be started. The crew must manually operate step by step in the order of "opening the airlock → starting the blower → starting the side thruster," which is cumbersome and lengthy, and prone to start-up failure due to operational errors. If the airlock fails to open, the side thruster blower cannot start, and consequently, the side thruster cannot start either; if the side thruster blower experiences overload or power failure during operation, the side thruster will immediately stop. This "one failure, all failures" chain mechanism means that a single failure of auxiliary equipment such as the blower directly leads to the failure of the main propulsion system, severely reducing the reliability of ship maneuvering, and the impact of the failure is too wide. The feasibility of the side thruster continuing to operate after the blower fails is not considered, nor are there any protective measures for the blower in case the airlock is accidentally closed, which increases the risk of unnecessary shutdown and may cause equipment damage due to the blower running idling without cooling. Utility Model Content

[0006] This utility model discloses an interlocking start-up control system for the bow thruster fan, airlock and thrust device to overcome the above-mentioned technical problems.

[0007] To achieve the above objectives, the technical solution of this utility model is as follows: An interlocking start-up control system for a bow thruster nacelle fan, air damper, and thruster assembly includes: a thruster starter unit, a fan starter unit, an air damper unit, a bow thruster unit, and a main control circuit; The main control circuit is provided with a first intermediate relay coil and a first normally open contact, a second normally open contact, and a third normally open contact of the first intermediate relay coil. The first intermediate relay coil is connected to the power supply. The first normally open contact of the first intermediate relay coil is used for the self-locking of the side thrust starter unit. The second normally open contact of the first intermediate relay coil is connected to the wind turbine starter unit. The third normally open contact of the first intermediate relay coil is connected to the bow side thrust unit. The wind turbine starting unit includes a wind turbine contactor coil, a third intermediate relay coil, a wind turbine thermal protector, a second intermediate relay coil, and a first normally open contact and a second normally open contact of the second intermediate relay coil. The second normally open contact of the second intermediate relay coil and the second normally open contact of the third intermediate relay coil are connected in series to the power supply branch of the windshield unit. The first normally open contact of the second intermediate relay coil and the first normally open contact of the third intermediate relay coil are connected in series to the power supply branch of the bow thruster unit. When the power supply branch of the wind turbine contactor coil is closed, it is energized, and the second normally open contact of the wind turbine contactor coil closes to start the bow thruster unit wind turbine. The auxiliary contact of the wind turbine thermal protector is connected in series in the main power supply circuit of the wind turbine and is used to control the energization / de-energization of the second intermediate relay coil. The airlock unit includes an airlock motor, a fourth intermediate relay coil, and a normally open contact of the fourth intermediate relay coil. The power supply branch of the airlock motor is energized after the second normally open contact of the second intermediate relay coil and the second normally open contact of the third intermediate relay coil are closed in sequence. After the airlock motor is opened, the fourth intermediate relay coil is energized and the normally open contact of the fourth intermediate relay coil is closed. The bow thruster unit includes a thruster contactor coil and a thruster thermal protector. The power supply branch of the thruster contactor coil is energized after the third normally open contact of the first intermediate relay coil is closed with the normally open contact of the wind turbine contactor coil. The second normally open contact of the thruster contactor coil closes to start the bow thruster. After the thruster contactor coil is energized, the first normally open contact of the thruster contactor coil closes to form a self-locking mechanism. The auxiliary contact of the thruster thermal protector is connected in series in the main power supply circuit of the thruster and is used to control the energization / de-energization of the first intermediate relay coil. When the limit switch is disconnected due to a malfunction of the windshield unit, the coil of the fourth intermediate relay loses power, causing the normally open contact of the coil of the fourth intermediate relay to open, and the coil of the wind turbine contactor loses power, causing the bow thruster wind turbine to stop.

[0008] Furthermore, after the stop button is activated and the first intermediate relay coil is de-energized, the time relay coil disconnects the branch containing the third, second, and fourth intermediate relay coils after a delay, so that the bow thruster and airlock close after a delay following the stop of the thruster.

[0009] Furthermore, the delay disconnection time of the time relay coil is 3 minutes.

[0010] Furthermore, the first normally open contact of the first intermediate relay coil is located on the side push panel of the bridge tower, and is connected in parallel with the start button to form a side push start self-locking circuit; the normally open contact of the fan contactor coil is connected to the side push panel of the bridge tower to feed back the fan operation signal to the bridge tower display panel.

[0011] Furthermore, the operation signal of the fan thermal protector is simultaneously transmitted to the local control box and the bridge tower display panel to display the fan fault status.

[0012] Furthermore, the side thrust starter unit, the wind turbine starter unit, the wind damper unit, and the bow side thrust unit are integrated into the local control box of the bow side thrust cabin, and are signal-connected to the bridge side thrust panel via the third normally open contact of the first intermediate relay coil.

[0013] Furthermore, after the side thruster contactor coil is energized, the normally open contacts of the side thruster contactor coil close to form a self-locking mechanism, so that the bow thruster continues to run after the start button is released.

[0014] Beneficial effects: The interlocking start control system of the bow thruster blower, airlock and thruster of this utility model, through the interlocking cooperation of the main control circuit, blower start unit, airlock unit and thruster unit, allows the crew to press a single start button and the system will automatically complete the entire start process in the sequence of "airlock open → blower start → thruster start", without the need for manual operation of the airlock, blower and thruster one by one, completely eliminating the cumbersome and misoperation risk brought about by traditional step-by-step operation, and achieving the purpose of energy saving and consumption reduction.

[0015] In the event of a turbine failure, the bow thruster continues to operate, improving system reliability: When the turbine experiences overload or a power failure, the turbine protector activates, de-energizing the second intermediate relay coil KFR. Its normally open contact KFR-2 opens to close the windshield, and KFR-1 opens to stop the turbine. However, because the bow thruster contactor coil KM2 remains energized through a self-locking contact, the bow thruster continues to operate, unaffected by the turbine failure. This fault-tolerant design avoids the problem of auxiliary equipment failure directly causing main propulsion system failure, significantly improving the reliability and safety of ship maneuvering.

[0016] The system automatically stops the fan in case of a damper malfunction to protect equipment safety: If the damper closes unexpectedly due to a malfunction, the limit switch disconnects, de-energizing the coil of the fourth intermediate relay. Its normally open contact opens, cutting off the power supply to the fan contactor coil KM1, thus automatically stopping the side thruster fan. This protection mechanism prevents equipment damage caused by the fan running idle without cooling when the damper is closed, extending the fan's service life.

[0017] In summary, this utility model simplifies operation while taking into account system availability and equipment safety, and is particularly suitable for large ships with high requirements for maneuverability. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a block diagram of the overall structure of the interlocking start-up control system for the bow thruster nacelle fan, airlock, and thruster of this utility model; Figure 2 This is a schematic diagram of the side-push starter unit circuit in an embodiment of the present invention. Figure 3 This is a schematic diagram of the fan starting unit circuit in an embodiment of the present invention; Figure 4 This is a schematic diagram of the circuit principle of the air damper unit in an embodiment of this utility model. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] This embodiment describes an interlocking start-up control system for the bow thruster nacelle fan, air damper, and thruster, such as... Figures 1-4 As shown, it includes: Main control circuit: Equipped with three-phase AC power supplies L1, L2, and L3; a closing switch QF1; a start button SB1; a stop button SB2; a first intermediate relay coil KS; and its first normally open contact KS-1, second normally open contact KS-2, and third normally open contact KS-3. The first intermediate relay coil KS is connected to the power supply via the closing switch QF1, with one end connected to the positive terminal and the other end connected to the negative terminal. The start button SB1 and the first normally open contact KS-1 of the first intermediate relay coil are connected in parallel to form a self-locking circuit. The second normally open contact KS-2 of the first intermediate relay coil is connected to the wind turbine starting unit, and the third normally open contact KS-3 of the first intermediate relay coil is connected to the bow thruster unit.

[0022] The fan starting unit includes a fan contactor coil KM1, a time relay coil KT, a third intermediate relay coil KF, a second intermediate relay coil KFR, and the first normally open contact KFR-1 and the second normally open contact KFR-2 of the second intermediate relay coil, as well as a fan thermal protector FR1. The time relay coil KT is controlled by the second normally open contact KS-2 of the first intermediate relay coil, and the third intermediate relay coil KF is controlled by the normally open contact KT-1 of the time relay coil. One end of the time relay coil KT is connected to the power supply via contact KS-2, and the other end is connected to the negative terminal of the power supply. The normally open contact KT-1 of the time relay coil KT controls the third intermediate relay coil KF. The second normally open contact KFR-2 of the second intermediate relay coil and the second normally open contact KF-2 of the third intermediate relay coil are connected in series to the power supply branch of the windshield unit. The first normally open contact KFR-1 of the second intermediate relay coil and the first normally open contact KF-1 of the third intermediate relay coil are connected in series to the power supply branch of the bow thruster unit. After the power supply branch of the wind turbine contactor coil KM1 is closed, it is energized, and the second normally open contact KM1-2 of the wind turbine contactor coil closes to start the bow thruster wind turbine; the auxiliary contact FR1-1 of the wind turbine thermal protector is connected in series in the main power supply circuit of the wind turbine and is used to control the energization / de-energization of the second intermediate relay coil KFR. The fan thermal protector FR1 is connected in series in the main power supply circuit of the fan. The auxiliary contact FR1-1 of the fan thermal protector controls the energization / de-energization of the second intermediate relay coil KFR (when the fan is normal, the auxiliary contact FR1-1 of the fan thermal protector is closed, and the second intermediate relay coil KFR is energized; when the fan malfunctions, the auxiliary contact FR1-1 of the fan thermal protector is open, and the second intermediate relay coil KFR is de-energized). The second normally open contact KFR-2 of the second intermediate relay coil and the second normally open contact KF-2 of the third intermediate relay form a self-starting unit for the fan, such as... Figure 4 .

[0023] The power supply branch of the wind turbine contactor coil KM1 is controlled by the series connection of the normally open contact KO-1 of the fourth intermediate relay coil, the first normally open contact KF-1 of the third intermediate relay coil, and the first normally open contact KFR-1 of the second intermediate relay coil. After the normally open contact KO-1 of the fourth intermediate relay coil, the first normally open contact KF-1 of the third intermediate relay coil, and the first normally open contact KFR-1 of the second intermediate relay coil are closed, the wind turbine contactor coil KM1 starts the side thruster fan.

[0024] The damper unit includes a damper motor, a limit switch OP, a fourth intermediate relay coil KO, and its normally open contact KO-1. The power supply branch for the damper motor is controlled by connecting the second normally open contact KFR-2 of the second intermediate relay coil and the second normally open contact KF-2 of the third intermediate relay in series. When the damper is opened, the limit switch OP is triggered to close, energizing the fourth intermediate relay coil KO, which then closes its normally open contact KO-1.

[0025] The bow thruster unit includes a thruster contactor coil KM2 and a thruster thermal protector FR2. The power supply branch of the thruster contactor coil KM2 is controlled by the series connection of the third normally open contact KS-3 of the first intermediate relay coil and the normally open contact KM1-1 of the fan contactor coil. When the third normally open contact KS-3 of the first intermediate relay coil and the normally open contact KM1-1 of the fan contactor coil are closed, the second normally open contact KM2-2 of the thruster contactor coil closes to start the bow thruster. The normally open contact KM2-1 of the thruster contactor coil is connected in parallel across the two ends of the normally open contact KM1-1 of the fan contactor coil. When the thruster contactor coil KM2 is energized, the normally open contact KM2-1 of the thruster contactor coil closes to form a self-locking mechanism. The auxiliary contact FR2-1 of the thruster thermal protector is connected in series in the main power supply circuit of the thruster and is used to control the energization / de-energization of the first intermediate relay coil KS. Specifically, when the fan thermal protector FR1 activates, causing the second intermediate relay coil KFR to lose power, the second normally open contact KFR-2 of the second intermediate relay coil opens to cut off the power supply to the damper motor, thus closing the damper unit. Simultaneously, the first normally open contact KFR-1 of the second intermediate relay coil opens, causing the fan contactor coil KM1 to lose power and the bow thruster fan to stop. The bow thruster contactor coil KM2 remains energized due to self-locking, keeping the bow thruster running. When the bow thruster thermal protector FR2 activates, causing the first intermediate relay coil KS to lose power, the third normally open contact KS-3 of the first intermediate relay coil opens to cut off the power supply to the bow thruster contactor coil KM2, thus stopping the bow thruster. Figure 1In the middle, the bridge tower side push panel 1 sends a side push start command to the side push starter unit 5, and at the same time, through the side push starter unit 5, it feeds back the side push operation signal, the fan operation signal, and the air damper opening and closing signal; the side push starter unit 5 sends a side push start command to the side push motor 2, and the side push motor 2 transmits the side push operation signal to the side push starter unit 5; the fan motor 3 receives the fan start command from the side push starter unit 5 through the fan starter unit 6, and at the same time feeds back the fan operation signal; the air damper solenoid valve 4 receives the air damper opening command from the fan starter unit 6 through the air damper unit 7, and feeds back the air damper opening signal.

[0026] The working principle of this utility model is as follows: When QF1 is closed, the control circuit is energized.

[0027] When the start button SB1 is pressed, the first intermediate relay coil KS is energized, and the first normally open contact KS-1, the second normally open contact KS-2, and the third normally open contact KS-3 of the first intermediate relay coil are closed simultaneously.

[0028] The first normally open contact KS-1 of the first intermediate relay coil is closed to achieve self-locking, keeping the first intermediate relay coil KS continuously energized.

[0029] The second normally open contact KS-2 of the first intermediate relay coil closes, energizing the time relay coil KT. The normally open contact KT-1 of the time relay coil immediately closes, thereby energizing the third intermediate relay KF. The first normally open contact KFR-1 of the second intermediate relay coil and the second normally open contact KFR-2 of the second intermediate relay coil close.

[0030] Under normal circumstances, the fan's heat pump protector and side-push heat pump protector are closed, keeping the second intermediate relay coil KFR continuously energized. This closes the first normally open contact KFR-1 and the second normally open contact KFR-2 of the second intermediate relay coil. At this time, the damper motor is energized via the second normally open contact KFR-2 of the second intermediate relay coil and the second normally open contact KF-2 of the third intermediate relay coil, causing the damper to open. After the damper is fully open, the limit switch OP closes, energizing the fourth intermediate relay coil KO, and closing its normally open contact KO-1.

[0031] At this time, the power supply branch of the fan contactor coil KM1 (KO-1, KF-1, and KFR-1 are all closed) is turned on, the fan contactor coil KM1 is energized, its normally open contacts close, and the fan motor starts running.

[0032] After the normally open contact KM1-1 of the wind turbine contactor coil closes, the branch connected in series with the third normally open contact KS-3 of the first intermediate relay coil is energized, the side thrust contactor coil KM2 is energized, the normally open contact KM2-1 of the side thrust contactor coil closes to achieve self-locking, and the bow thruster starts to run.

[0033] At this point, the one-click sequential start-up is complete: air damper → fan → side pusher.

[0034] In this invention, when the fan malfunctions: if the fan experiences overload or power failure, the fan thermal protector FR1 disconnects, the second intermediate relay coil KFR loses power, the second normally open contact KFR-2 of the second intermediate relay coil disconnects, the damper motor loses power, and the damper automatically closes; simultaneously, the first normally open contact KFR-1 of the second intermediate relay coil disconnects, the fan contactor coil KM1 loses power, and the side thruster fan stops. However, the side thruster contactor coil KM2 remains energized due to its self-locking circuit, and the bow thruster continues to operate unaffected.

[0035] When the air damper malfunctions: If the air damper closes unexpectedly, the limit switch OP will disconnect, the fourth intermediate relay coil KO will be de-energized, the normally open contact KO-1 of the fourth intermediate relay coil will open, the fan contactor coil KM1 will be de-energized, and the side thruster fan will stop to prevent the fan from overloading and running away.

[0036] When stopping and delayed shutdown: Pressing the stop button SB2 de-energizes the first intermediate relay coil KS, causing its contacts—the first normally open contact KS-1, the second normally open contact KS-2, and the third normally open contact KS-3—to open. After the second normally open contact KS-2 opens, the time relay coil KT begins timing (preset 3 minutes). During this time, the third intermediate relay coil KF, the second intermediate relay coil KFR, and the fourth intermediate relay coil KO remain energized, and the fan and damper continue to operate. After 3 minutes, the time relay coil KT de-energizes after a delay, the third intermediate relay coil KF de-energizes, and its first normally open contact KF-1 and second normally open contact KF-2 open. Consequently, the second intermediate relay coil KFR and the fourth intermediate relay coil KO de-energize, stopping the fan and closing the damper. This delay function prevents the impact of short-term repeated starts caused by the side-push mechanism.

[0037] Specifically, the normally open contact of the fan contactor coil KM1 sends the fan operation signal to the bridge tower display panel. The activation signal of the fan thermal protector FR1 is simultaneously sent to the local control box and the bridge tower display panel, allowing the crew to promptly receive fault information.

[0038] All units of this utility model system can be integrated into the local control box of the bow thruster compartment. The signal connection between the third normally open contact KS-3 of the first intermediate relay coil and the bridge thruster panel is realized, enabling remote one-button control.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An interlocking start-up control system for a bow thruster nacelle fan, air damper, and thruster, characterized in that, include: Side thrust starter unit, fan starter unit, air damper unit, bow side thruster unit, and main control circuit; The main control circuit is equipped with a first intermediate relay coil (KS) and a first normally open contact (KS-1), a second normally open contact (KS-2), and a third normally open contact (KS-3) of the first intermediate relay coil. The first intermediate relay coil (KS) is connected to the power supply. The first normally open contact (KS-1) of the first intermediate relay coil is used for self-locking of the side thrust starter unit. The second normally open contact (KS-2) of the first intermediate relay coil is connected to the wind turbine starter unit. The third normally open contact (KS-3) of the first intermediate relay coil is connected to the bow side thruster unit. The fan starting unit includes a fan contactor coil (KM1), a third intermediate relay coil (KF), a fan thermal protector (FR1), a second intermediate relay coil (KFR), and a first normally open contact (KFR-1) and a second normally open contact (KFR-2) of the second intermediate relay coil. The second normally open contact (KFR-2) of the second intermediate relay coil and the second normally open contact (KF-2) of the third intermediate relay coil are connected in series to the power supply branch of the damper unit. The first normally open contact (KFR-1) of the second intermediate relay coil and the first normally open contact (KF-1) of the third intermediate relay coil are connected in series to the power supply branch of the bow thruster unit. The power supply branch of the wind turbine contactor coil (KM1) is energized after it is closed, and the second normally open contact (KM1-2) of the wind turbine contactor coil is closed to start the bow thruster unit wind turbine. The auxiliary contact (FR1-1) of the wind turbine thermal protector is connected in series in the main power supply circuit of the wind turbine and is used to control the energization / de-energization of the second intermediate relay coil (KFR). The airlock unit includes an airlock motor, a fourth intermediate relay coil (KO), and a normally open contact (KO-1) of the fourth intermediate relay coil. The power supply branch of the airlock motor is energized after the second normally open contact (KFR-2) of the second intermediate relay coil and the second normally open contact (KF-2) of the third intermediate relay coil are closed. After the airlock motor is opened, the fourth intermediate relay coil (KO) is energized and the normally open contact (KO-1) of the fourth intermediate relay coil is closed. The bow thruster unit includes a thruster contactor coil (KM2) and a thruster thermal protector (FR2). The power supply branch of the thruster contactor coil (KM2) is energized after the third normally open contact (KS-3) of the first intermediate relay coil and the normally open contact (KM1-1) of the fan contactor coil are closed. The second normally open contact (KM2-2) of the thruster contactor coil closes to start the bow thruster. After the thruster contactor coil (KM2) is energized, the normally open contact (KM2-1) of the thruster contactor coil closes to form a self-locking mechanism. The auxiliary contact (FR2-1) of the thruster thermal protector is connected in series in the main power supply circuit of the thruster and is used to control the energization / de-energization of the first intermediate relay coil (KS). When the limit switch (OP) is disconnected due to a malfunction of the windshield unit, the fourth intermediate relay coil (KO) loses power, causing the normally open contact (KO-1) of the fourth intermediate relay coil to open, and the wind turbine contactor coil (KM1) loses power, causing the bow thruster wind turbine to stop.

2. The interlocking start-up control system for the bow thruster nacelle fan, air damper, and thruster as described in claim 1, characterized in that, The main control circuit also includes a closing switch (QF1), a start button (SB1), and a stop button (SB2); the fan starting unit also includes a time relay coil (KT); After the stop button (SB2) is activated and de-energizes the first intermediate relay coil (KS), the time relay coil (KT) disconnects the branch containing the third intermediate relay coil (KF), the second intermediate relay coil (KFR), and the fourth intermediate relay coil (KO) after a delay, so that the bow thruster and the airlock close after a delay after the thruster stops.

3. The interlocking start-up control system for the bow thruster nacelle fan, air damper, and thruster as described in claim 2, characterized in that, The time delay disconnection time of the time relay coil (KT) is 3 minutes.

4. The interlocking start-up control system for the bow thruster nacelle fan, air damper, and thruster as described in claim 2, characterized in that, The first normally open contact (KS-1) of the first intermediate relay coil is located on the side push panel of the bridge tower and is connected in parallel with the start button (SB1) to form a side push start self-locking circuit; the normally open contact (KM1-1) of the fan contactor coil is connected to the side push panel of the bridge tower and is used to feed back the fan operation signal to the bridge tower display panel.

5. The interlocking start-up control system for the bow thruster nacelle fan, air damper, and thruster as described in claim 1, characterized in that, The activation signal of the fan thermal protector (FR1) is simultaneously transmitted to the local control box and the bridge tower display panel to display the fan fault status.

6. The interlocking start-up control system for the bow thruster nacelle fan, air damper, and thruster as described in claim 1, characterized in that, The side thrust starter unit, wind turbine starter unit, wind damper unit, and bow side thrust unit are integrated in the local control box of the bow side thrust compartment, and are connected to the bridge side thrust panel via the third normally open contact (KS-3) of the first intermediate relay coil.

7. The interlocking start-up control system for the bow thruster nacelle fan, air damper, and thruster as described in claim 2, characterized in that, After the side thrust contactor coil (KM2) is energized, the normally open contact (KM2-1) of the side thrust contactor coil closes to form a self-locking mechanism, so that the bow thruster continues to run after the start button (SB1) is released.

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