Main propulsion device with galloping prevention function and ship

Abstract

The invention discloses a main propulsion device with an anti-galloping function and a ship, the main propulsion device is provided with a dynamic braking system, the dynamic braking system comprises a braking motor, a frequency conversion device, a braking resistor and / or a battery, the braking motor is arranged on a transmission path of an internal combustion engine and a main propeller, and a motor shaft of the braking motor is in transmission fit with a transmission structure. The brake motor and the internal combustion engine are jointly connected to the main propeller, when water flows out of the main propeller, part of energy is absorbed by the brake motor and consumed through a brake resistor or a battery, the loading and unloading amplitude of the internal combustion engine is greatly reduced, and the galloping phenomenon is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of ships, in particular to a main propulsion device and a ship with an anti-runaway function. Background Art

[0002] The main propulsion device of a ship is the power source for the ship to sail. A Chinese patent is disclosed in the prior art, and the publication number is CN102239082A. The patent provides a ship, which includes a hull and a propulsion device, and the propulsion device includes an internal combustion engine, an exhaust device and a propulsion unit. The ship is also provided with at least one vertically arranged cylinder with a vertical axis, and the vertically arranged cylinder is suitable for rotating around its vertical axis. In order to avoid any substantial increase in the wind resistance area, the vertically arranged cylinder is arranged around a part of the exhaust device of the ship. Therefore, the structural layout of the existing propulsion device is mature.

[0003] However, in actual application, when the ship encounters severe sea conditions and the main propulsion device frequently enters and exits the water, the main propulsion device has to frequently add and reduce load in a short period of time, which can easily lead to overspeeding, causing the ship to lose power and cause great harm to safe navigation. Summary of the invention

[0004] The purpose of the present invention is to provide a main propulsion device and a ship with an anti-runaway function, which greatly reduces the amplitude of loading and unloading of an internal combustion engine and prevents the runaway phenomenon.

[0005] The object of the present invention is achieved as follows: a main propulsion device with anti-runaway function, which is composed of a main propeller, a drive system, a power brake system and a propulsion control system; the drive system outputs power to the main propeller to provide thrust for the ship; when the load of the main propeller is greatly reduced in a short period of time, the power brake system is used to absorb the kinetic energy of the drive system and the main propeller and convert it into electrical energy to prevent the rotation speed from exceeding a set value; the propulsion control system sends control instructions to the drive system and the power brake system to make the main propeller run at a predetermined rotation speed;

[0006] The drive system includes an internal combustion engine and a shaft system; the power brake system is composed of a brake motor, a frequency converter, a brake resistor or an energy storage device; the ratio of the speed setting value of the brake motor to the internal combustion engine under all working conditions is equal;

[0007] When the rotation speed of the main propeller exceeds the set value of the propulsion control system, the brake motor generates a reverse torque to absorb part of the power of the internal combustion engine, and the frequency conversion device is used to direct the power absorbed by the brake motor into the brake resistor for release or battery storage to achieve braking.

[0008] Furthermore, the internal combustion engine and the brake motor are connected in parallel to the main propulsion unit.

[0009] Furthermore, the internal combustion engine and the brake motor are connected in series to the main propeller.

[0010] Furthermore, the energy storage device includes a battery, a capacitor, or a brake resistor.

[0011] Furthermore, the frequency conversion device of the power brake system includes an inverter module and a rectifier module, the inverter module is electrically connected to the rectifier module, the frequency conversion device is electrically connected to a battery, or a brake resistor is provided on the electrical connection line.

[0012] Furthermore, the internal combustion engine is equipped with a speed governor.

[0013] Furthermore, the propulsion control system is connected to the speed governor and the power brake system and sends control instructions to the speed governor and the power brake system to make the main propeller run at a predetermined speed.

[0014] Furthermore, the speed regulator is electrically connected to a frequency converter of a power brake system.

[0015] As another aspect of the present invention, a ship is provided, which is equipped with the above-mentioned main propulsion device.

[0016] The beneficial effects of the present invention are:

[0017] Compared with the existing technical solutions, the amplitude of frequent loading and unloading of the main propulsion device is greatly reduced, which can cope with the situation that the main propeller frequently enters and exits the water surface, prevents the phenomenon of runaway, and avoids the substantial drop of propeller power, thus improving the safety of ship navigation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a first embodiment of the present invention.

[0019] Figure 2 It is a schematic diagram of a second embodiment of the present invention.

[0020] Figure 3 It is a schematic diagram of the principle of the present invention.

[0021] Explanation of the reference numerals: 1-drive system; 101-internal combustion engine; 102-speed regulator; 103-gearbox; 104-drive shaft; 2-main propeller; 3-brake motor; 4-power brake system; 401-inverter module; 402-rectifier module; 403-battery; 5-propulsion control system. DETAILED DESCRIPTION

[0022] The following will be combined with the attached embodiment of the present invention Figure 1-3, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] like Figure 1-2 A main propulsion device with anti-runaway function is proposed, and the core concept is:

[0024] It consists of a main propeller 2, a drive system 1, a dynamic braking system 4 and a propulsion control system 5; the drive system 1 outputs power to the main propeller 2 to provide thrust for the ship; when the load of the main propeller 2 is greatly reduced in a short period of time, the dynamic braking system 4 is used to absorb the kinetic energy of the drive system 1 and the main propeller 2, and convert it into electrical energy to prevent the speed from exceeding the set value; the propulsion control system 5 sends control instructions (speed setting value and other instructions) to the drive system 1 and the dynamic braking system 4 to make the main propeller 2 run at a predetermined speed.

[0025] The above-mentioned drive system 1 includes components such as an internal combustion engine 101 and a shaft system; the power brake system 4 is composed of a brake motor 3, a frequency converter, a brake resistor or an energy storage device (battery or capacitor); the ratio of the speed setting value of the brake motor 3 and the internal combustion engine 101 under all working conditions is equal (speed synchronization);

[0026] When the rotation speed of the main propeller 2 exceeds the set value of the propulsion control system 5, the brake motor 3 generates a reverse torque to absorb part of the power of the internal combustion engine 101. The frequency converter is used to direct the power absorbed by the brake motor 3 into the brake resistor for release (resistance braking) or battery storage (regenerative braking) to achieve braking.

[0027] Specifically, the internal combustion engine 101, transmission structure (mainly transmission shaft system, including drive shaft 104) and main propeller 2 of the device are driven in sequence. The drive system 1 is composed of the internal combustion engine 101, transmission shaft system and other components. The internal combustion engine 101 outputs power to the main propeller 2 to provide power for the ship.

[0028] The above-mentioned power brake system 4 includes a brake motor 3, a frequency converter, a brake resistor and / or a battery 403 (energy storage unit, which can also be a capacitor). The brake motor 3 is electrically connected to the battery 403 through the frequency converter, and the brake resistor is arranged in the frequency converter. The ratio of the speed setting value of the brake motor 3 and the internal combustion engine 101 under all working conditions is equal (speed synchronization).

[0029] The brake motor 3 is arranged on the transmission path between the internal combustion engine 101 and the main propeller 2, and the motor shaft of the brake motor 3 is in transmission cooperation with the transmission structure.

[0030] When the main propeller 2 is out of water, the brake motor 3 performs electric braking to absorb part of the energy of the internal combustion engine 101, and consumes it through the brake resistor and / or the battery 403. The brake resistor is used to convert the electrical energy into heat energy, and the battery 403 is used to store the energy absorbed by the brake motor 3 during the electric braking process.

[0031] Among them, the frequency conversion device of the above-mentioned power braking system 4 includes an inverter module 401, and the frequency conversion device of the power braking system 4 also includes a rectifier module 402. The inverter module 401 is electrically connected to the rectifier module 402, and the rectifier module 402 is electrically connected to the battery 403. A brake resistor is set on the electrical connection line.

[0032] See also Figure 3 As shown, when the ship encounters severe sea conditions and the main propeller 2 is exposed to the water, the load is greatly reduced in a short period of time, causing the actual speed of the main propeller 2 to exceed the set value of the propulsion control system 5. At this time, the brake motor 3 enters the electric braking mode and generates a reverse torque. By absorbing part of the power of the internal combustion engine 101, the internal combustion engine 101 still has a certain load, reducing the increase in the speed of the internal combustion engine 101, and preventing the speed of the internal combustion engine 101 from exceeding the limit (runaway). At the same time, the frequency conversion device of the power brake system 4 introduces the power absorbed by the brake motor 3 into the brake resistor for release (resistance braking) or uses the battery 403 for storage (regenerative braking) to achieve braking.

[0033] When the main propeller 2 re-enters the water surface, the load increases significantly in a short period of time, the rotation speed decreases, and the brake motor stops 3 to stop absorbing the energy of the internal combustion engine 101. Since the internal combustion engine 101 has a certain load basis before, it avoids sudden shutdown (stifling) caused by sudden load increase when the load is too low.

[0034] The electric braking of the brake motor 3 can be divided into two modes: regenerative braking and resistance braking. The energy absorbed by the former is introduced into the battery 403 for storage through the inverter module 401 in the frequency converter. The energy absorbed by the latter is introduced into the brake resistor through the inverter module 401 in the frequency converter to convert electrical energy into heat energy, which is released through heat dissipation.

[0035] The internal combustion engine 101 and the brake motor 3 can be connected to the main propeller 2 in parallel or in series, specifically including the following two embodiments:

[0036] like Figure 1 The first embodiment is shown. In the first embodiment, the transmission structure may include a gear box 103. The internal combustion engine 101 is matched with the transmission shaft system through the gear box 103 (connected in parallel). The motor shaft of the brake motor 3 is connected to the gear box 103. When braking, the brake motor 3 brakes the internal combustion engine 101 through the gear box 103.

[0037] like Figure 2 The second embodiment is shown. In the second embodiment, the motor shaft of the brake motor 3 is drivingly connected to the transmission shaft system, that is, directly connected (connected in series). During braking, the brake motor 3 directly brakes the internal combustion engine 101.

[0038] According to the above main propulsion device, a ship is proposed, which includes the above main propulsion device.

[0039] The internal combustion engine 101 is equipped with an electronic speed governor 102. The propulsion control system 5 is connected to the speed governor 102 and the power brake system 4 and sends control instructions to the speed governor 102 and the power brake system 4 to make the main propeller 2 run at a predetermined speed.

[0040] The speed regulator 102 is electrically connected to the frequency converter of the power brake system 4 .

[0041] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships 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 device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention; in the present invention, it should also be noted that the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integrally formed connection, a mechanical connection, or an indirect connection through an intermediate connecting component, and the specific meaning of the terms in this utility model can be understood according to the specific circumstances.

[0042] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any reference numerals in the claims should not be regarded as limiting the claims involved.

[0043] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A main propulsion device with anti-runaway function, characterized in that: It is composed of a main propeller (2), a drive system (1), a dynamic braking system (4) and a propulsion control system (5); the drive system (1) outputs power to the main propeller (2) to provide thrust for the ship; when the load of the main propeller (2) is greatly reduced in a short period of time, the dynamic braking system (4) is used to absorb the kinetic energy of the drive system (1) and the main propeller (2) and convert it into electrical energy to prevent the rotation speed from exceeding a set value; the propulsion control system (5) sends control instructions to the drive system (1) and the dynamic braking system (4) to enable the main propeller (2) to operate at a predetermined rotation speed; The drive system (1) comprises an internal combustion engine (101) and a shaft system; the power brake system (4) comprises a brake motor (3), a frequency conversion device, a brake resistor or an energy storage device; the ratio of the speed setting values ​​of the brake motor (3) and the internal combustion engine (101) under all working conditions is equal; When the rotation speed of the main propeller (2) exceeds the set value of the propulsion control system (5), the brake motor (3) generates a reverse torque to absorb part of the power of the internal combustion engine (101), and the frequency conversion device is used to direct the power absorbed by the brake motor (3) into the brake resistor for release or battery storage to achieve braking.

2. A main propulsion device with anti-runaway function according to claim 1, characterized in that: The internal combustion engine (101) and the brake motor (3) are connected in parallel to the main propeller (2).

3. The main propulsion device with anti-runaway function according to claim 1, characterized in that: The internal combustion engine (101) and the brake motor (3) are connected in series to the main propeller (2).

4. The main propulsion device with anti-runaway function according to claim 1, characterized in that: The energy storage device includes a battery, a capacitor, or a brake resistor.

5. The main propulsion device with anti-runaway function according to claim 1, characterized in that: The frequency conversion device of the power brake system (4) comprises an inverter module (401) and a rectifier module (402), the inverter module (401) is electrically connected to the rectifier module (402), and the frequency conversion device is electrically connected to a battery (403), or a brake resistor is arranged on the electrical connection line.

6. A main propulsion device with anti-runaway function according to claim 5, characterized in that: The internal combustion engine (101) is equipped with a speed regulator (102).

7. A main propulsion device with anti-runaway function according to claim 6, characterized in that: The propulsion control system (5) is connected to the speed governor (102) and the power brake system (4) and sends control instructions to the speed governor (102) and the power brake system (4) to enable the main propeller (2) to operate at a predetermined rotation speed.

8. The main propulsion device with anti-runaway function according to claim 7, characterized in that: The speed regulator (102) is electrically connected to the frequency conversion device of the power brake system (4).

9. A ship, characterized in that: It is equipped with the main propulsion device described in claim 1.

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