Large speed regulating system for marine diesel engine

Abstract

The utility model relates to a large speed regulating system for a marine diesel engine, which realizes accurate control of the rotating speed of the diesel engine through components such as a speed regulating controller, an electro-hydraulic control mechanism, a speed setting device, a fly ball, a slide valve mechanism, a prompt drop mechanism, a compensation mechanism, a slide valve core, a power output oil cylinder and a rotating speed sensor. According to the system, under the condition that the electro-hydraulic control mechanism loses power, the rotating speed can be sensed and adjusted through the sliding valve mechanism, the compensation mechanism and the prompt drop mechanism. In addition, the system further comprises a power output oil cylinder which is used for amplifying various adjusting signals of the speed regulator and finally outputting angular displacement. The system can be automatically switched between an electro-hydraulic mode and a mechanical hydraulic mode, and it is ensured that the diesel engine works at the stable rotating speed.

Description

Technical Field

[0001] The present application relates to the technical field of medium and low speed diesel engines, and in particular to a large speed control system for marine diesel engines. Background Art

[0002] The governor is a speed control mechanism for diesel engines. The condition for a diesel engine to operate stably at a certain speed is that the output power is balanced with the external load. Changes in the external load will cause a corresponding change in the engine speed. The output power of a diesel engine is directly related to the amount of fuel delivered to the cylinder by the injection pump. If the injection pump's fuel supply remains constant, the speed will increase when the external load decreases; when the external load increases, the speed will decrease. The governor's function is to increase the fuel supply of the injection pump when the engine speed decreases; and to reduce the fuel supply of the injection pump when the speed increases. This ensures that the injection pump's fuel supply always matches the external load, thus ensuring the stable operation of the diesel engine.

[0003] A hydraulic speed governor typically uses the centrifugal force generated by the rotor to balance the spring force of the speed control spring. When the speed is stable, the operating window of the spool valve driven by the rotor is closed. When the speed needs to be increased or decreased, the operating window of the spool valve opens, allowing high-pressure oil to flow into or out of the power piston oil chamber. The movement of the power piston drives the governor output shaft, which controls the oil supply from the injection pump. Hydraulic speed governors offer high output torque and long service life. Electronic control offers high control precision, fast response, and ease of automatic and remote control.

[0004] The regulation and control functions of the speed control system can achieve the best match for the characteristics of the engine fuel system, ensure that it works under optimized working conditions, and modify the control rules according to the fuel characteristics to improve the technical indicators of the fuel system. Summary of the Invention

[0005] This application proposes a large-scale speed control system for marine engines. This system uses a mechanical-hydraulic speed control system to actively follow an electro-hydraulic speed control system with an electro-hydraulic servo valve, and the speed is 5% higher than the set value of the electro-hydraulic mode. This system allows the speed control system to perform high-precision electro-hydraulic mode speed control in the default mode. When the diesel engine overspeeds or loses power, causing the electro-hydraulic mode to fail, the mechanical-hydraulic speed control mode actively follows the engine continuously, allowing the diesel engine to maintain a stable speed set before the power outage, thus preventing the engine from running out of control. This system solves the problem of existing speed control systems being unable to simultaneously achieve high reliability and high speed control accuracy, and enables the regulation and control of the fuel system characteristics of marine diesel engines.

[0006] The present application provides a large-scale speed control system for a marine diesel engine, the system comprising:

[0007] The speed controller is used to collect the diesel engine speed signal and compare it with the set speed signal to form a speed deviation signal;

[0008] Electro-hydraulic control mechanism, which realizes speed setting and adjustment through electro-hydraulic servo valve;

[0009] A speed control device, used to receive the signal from the speed controller and adjust the current speed control signal;

[0010] Flyweight, used to generate centrifugal force to control the movement of the spool;

[0011] The speed regulating spring is used to balance the centrifugal force of the fly hammer and the preload force of the speed regulating spring. When there is an imbalance, an adjustment signal is sent synchronously.

[0012] Slide valve mechanism, including flyweight assembly, slide valve assembly, plunger, spring and spring seat components;

[0013] The descent mechanism includes a rotating shaft, a cam, and a lever to control the movement of the power cylinder;

[0014] Compensation mechanism, used in conjunction with the slide valve mechanism;

[0015] The spool of the sliding valve mechanism is controlled by the centrifugal force of the flyweight;

[0016] Power output cylinder, including servo motor body, compensation adjustment needle valve, spring, power piston, oil seal and output shaft;

[0017] The speed sensor is used to sense the speed of the diesel engine and feed it back to the electro-hydraulic control mechanism.

[0018] In some embodiments, the speed controller inputs the speed deviation signal into the electro-hydraulic control mechanism and the speed matching device as a signal after the speed deviation signal is processed and power amplified by an analog PID circuit.

[0019] In some embodiments, when the electro-hydraulic control mechanism loses power, the pressure is sensed and regulated by the electro-hydraulic control mechanism, the slide valve mechanism, the compensation mechanism, and the speed reduction mechanism.

[0020] In some embodiments, the functions of the sliding valve mechanism include:

[0021] The centrifugal force of the flyweight is balanced with the preload of the speed regulating spring. When there is an imbalance, an adjustment signal is sent synchronously.

[0022] Filter and reduce the speed pulsation signal and mechanical vibration signal transmitted by the diesel engine;

[0023] Together with the buffer piston, buffer spring and compensation regulating needle valve, it realizes rapid stabilization of the entire speed control system.

[0024] In some embodiments, when the diesel engine accelerates, the speed reduction mechanism controls the power cylinder to move upward, compresses the speed regulating spring, and makes the speed higher than the original set value; when the diesel engine decelerates, the speed reduction mechanism controls the power cylinder to move downward, and makes the speed lower than the original set value.

[0025] In some embodiments, the functions of the power take-off cylinder include:

[0026] Amplify various regulating signals of the speed regulator and output the final angular displacement;

[0027] Adjust the opening of the compensation regulating needle valve to adjust the performance index of the diesel engine;

[0028] The power piston drives the output shaft to rotate through the connecting rod, with sufficient torque to drive the diesel engine fuel control mechanism.

[0029] In some embodiments, the electro-hydraulic mode senses the speed through a speed sensor and feeds back to the electro-hydraulic control mechanism for speed setting and adjustment, so as to realize the simultaneous operation of the two systems, complete the actuator speed regulation action, adjust the circulating fuel supply of the diesel engine, and make the diesel engine operate at a stable speed.

[0030] In some embodiments, the mechanical hydraulic part actively follows the electro-hydraulic part, and in case of emergency, there is no need to switch modes, and the mechanical hydraulic mode operation is automatically realized.

[0031] In some embodiments, the speed controller includes a digital signal processor for processing the output signal of the analog PID circuit to improve the response speed and control accuracy of the system.

[0032] In some embodiments, the system further includes a fault diagnosis module for monitoring the operating status of the speed control system, automatically alarming and providing troubleshooting guidance when an abnormality is detected, to ensure stable operation of the system.

[0033] The above-described embodiments of the present application provide a large-scale speed control system for marine diesel engines. This system achieves precise control of the diesel engine speed through components such as a speed controller, an electro-hydraulic control mechanism, a speed distribution device, a flyweight, a slide valve device, a speed reduction mechanism, a compensation mechanism, a slide valve spool, a power take-off cylinder, and a speed sensor. In the event of a power failure in the electro-hydraulic control mechanism, the system can sense and regulate the speed through the slide valve device, compensation mechanism, and speed reduction mechanism. Furthermore, the system also includes a power take-off cylinder for amplifying and processing various regulation signals from the speed regulator and ultimately outputting angular displacement. The system can automatically switch between electro-hydraulic mode and mechanical hydraulic mode to ensure the diesel engine operates at a stable speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings illustrate generally, by way of example and not limitation, various embodiments discussed herein.

[0035] Figure 1 This is a schematic diagram of the principle of a large-scale speed control system for a marine engine according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present application, the implementation of the embodiments of the present application is described in detail below with reference to the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application.

[0037] In the description of the embodiments of this application, it should be noted that, unless otherwise specified and limited, the term "connection" should be understood in a broad sense. For example, it can be an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meaning of the above terms can be understood according to the specific circumstances.

[0038] It should be noted that the terms "first, second, and third" in the embodiments of the present application are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It is understood that the terms "first, second, and third" can be interchanged to represent a specific order or precedence where permitted. It should be understood that the objects distinguished by "first, second, and third" can be interchanged where appropriate, such that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0039] Large speed control systems for marine diesel engines such as Figure 1 As shown, the speed control system includes: a speed controller 1, an electro-hydraulic control mechanism 2, a speed matching device 3, a speed control spring 4, a flyweight 5, a speed reduction mechanism 6, a compensation mechanism 7, a slide valve mechanism 8, a power output cylinder 9 and a speed sensor 10.

[0040] like Figure 1 As shown, the speed control system of this application includes the following main components:

[0041] Speed ​​controller 1: collects the diesel engine speed signal and compares it with the set speed signal to form a speed deviation signal.

[0042] Electro-hydraulic control mechanism 2: The speed is set and adjusted through an electro-hydraulic servo valve.

[0043] Speed ​​control device 3: receives the signal from the speed controller and adjusts the current speed control signal.

[0044] Flying hammer 5: generates centrifugal force to control the movement of the spool of the sliding valve.

[0045] Speed ​​regulating spring 4: The centrifugal force of the flyweight 5 is balanced with the preload force of the speed regulating spring 4. When there is an imbalance, an adjustment signal is sent synchronously.

[0046] Sliding valve mechanism 8: including fly hammer frame assembly, sliding valve assembly, plunger, spring and spring seat parts.

[0047] The descent mechanism 6 includes a rotating shaft, a cam, and a lever to control the movement of the power cylinder.

[0048] Compensation mechanism 7: used in conjunction with the slide valve mechanism 8.

[0049] The valve core of the sliding valve mechanism 8 is controlled by the centrifugal force of the flying hammer 5.

[0050] Power output cylinder 9: includes a servo motor body, a compensation adjustment needle valve, a spring, a power piston, an oil seal and an output shaft.

[0051] Speed ​​sensor 10: senses the speed of the diesel engine and feeds back to the electro-hydraulic control mechanism.

[0052] The speed controller 1 collects the diesel engine speed signal and compares it with the set speed signal to generate a speed deviation signal. This deviation signal, after analog PID circuit calculation and power amplification, serves as the signal input, simultaneously providing the current speed regulation signal to the electro-hydraulic control mechanism 2 and the speed distribution device 3 to achieve the set speed. The electro-hydraulic control mechanism 2 sets and adjusts the speed via an electro-hydraulic servo valve. The current flowing through the electro-hydraulic control mechanism 2 is adjusted based on changes in the speed sensor 10, thereby controlling the movement of the power take-off cylinder 9.

[0053] When power is lost to the electro-hydraulic control mechanism 2, pressure is constantly flowing through it, the spool mechanism 8, the compensation mechanism 7, and the speed-down mechanism 6 to sense and regulate the rotational speed. The centrifugal force generated by the flyweight 5 controls the movement of the spool of the spool mechanism 8, thereby controlling the power output cylinder 9. The spool mechanism 8 includes the flyweight frame assembly, the spool assembly, the plunger, the spring, and the spring seat. Its functions are as follows:

[0054] The centrifugal force of the fly hammer 5 is balanced with the preload force of the speed regulating spring 4. When there is an imbalance, an adjustment signal is sent synchronously.

[0055] Filter and reduce the speed pulsation signal and mechanical vibration signal transmitted by the diesel engine.

[0056] Together with the buffer piston, buffer spring and compensation regulating needle valve, it realizes rapid stabilization of the entire speed control system.

[0057] The descent mechanism 6 includes a rotating shaft, a cam, and a lever. When the diesel engine accelerates, the descent mechanism 6 controls the upward movement of the power cylinder, compressing the speed control spring 4 and increasing the speed above the set value. When the diesel engine decelerates, the descent mechanism 6 controls the downward movement of the power cylinder, decreasing the speed below the set value. The power output cylinder 9 includes a servo motor body, a compensating adjustment needle valve, a spring, a power piston, an oil seal, and an output shaft. Its functions are as follows:

[0058] The various regulating signals of the speed regulator are amplified and processed, and the final angular displacement is output.

[0059] In this embodiment, the speed controller collects the actual speed signal of the diesel engine and compares it with a preset speed signal to generate a speed deviation signal. This deviation signal, after being processed and amplified by an analog PID circuit, is then output to the electro-hydraulic control mechanism and the speed distribution device. Based on the received signal, the electro-hydraulic control mechanism adjusts the current within the electro-hydraulic servo valve, thereby controlling the movement of the power take-off cylinder and regulating the diesel engine speed.

[0060] When the electro-hydraulic control mechanism loses power, the system uses the centrifugal force generated by the flyweight to control the movement of the spool valve core, thereby controlling the power take-off cylinder and sensing and regulating the rotational speed. The flyweight frame assembly, spool valve assembly, plunger, spring, and spring seat in the spool valve assembly work together to ensure stable system operation.

[0061] The speed-down mechanism controls the upward movement of the power cylinder during engine acceleration, compressing the speed control spring and increasing the speed above the set value. It controls the downward movement of the power cylinder during engine deceleration, decreasing the speed below the set value. The power take-off cylinder amplifies the various speed governor control signals and outputs the final angular displacement, adjusting the opening of the compensation control needle valve to adjust the engine's performance.

[0062] This embodiment also includes a fault diagnosis module for monitoring the operating status of the speed control system. This module can detect the operating status of each system component in real time. If an abnormality is detected, such as power failure of the electro-hydraulic control mechanism or malfunction of the slide valve device, it can automatically alarm and provide troubleshooting guidance to ensure stable operation of the system.

[0063] The speed controller further includes a digital signal processor for processing the output signal of the analog PID circuit. This digital signal processor can improve the system's response speed and control accuracy, enabling the speed control system to respond to the diesel engine's speed regulation requirements more quickly and accurately.

[0064] Adjusting the opening of the compensating needle valve adjusts the diesel engine's performance. The power piston rotates the output shaft via the connecting rod, generating sufficient torque to actuate the diesel engine's fuel control mechanism. In the electro-hydraulic mode, a speed sensor senses the speed and provides feedback to the electro-hydraulic control mechanism 2 for speed setting and adjustment. This allows both systems to operate simultaneously, completing the actuator's speed regulation and regulating the diesel engine's circulating fuel supply, ensuring stable engine speed operation. The mechanical-hydraulic mode automatically follows the electro-hydraulic mode, eliminating the need to switch modes in emergencies.

[0065] The mechanical-hydraulic speed control system actively follows the electro-hydraulic speed control system with an electro-hydraulic servo valve, and the speed is 5% higher than the set value of the electro-hydraulic mode. There is no need to manually switch modes. When the electro-hydraulic mode fails due to accidents such as diesel engine overspeed or power failure, the mechanical-hydraulic speed control mode is a continuous and active follow-up, which can keep the diesel engine running at a stable speed set before the power failure, preventing runaway or overspeeding.

[0066] The two systems share a speed controller and power take-off cylinder to respectively set and control the speed of the two systems, thus achieving high reliability and high speed regulation and control capabilities of the fuel system characteristics of the marine diesel engine while saving costs.

[0067] The mechanical hydraulic system and the electro-hydraulic system are both given speed control signals by the speed controller, which can keep the diesel engine running at a stable speed set before power failure to prevent the occurrence of runaway.

[0068] The technical solutions described in the embodiments of this application can be combined arbitrarily unless there is any conflict.

[0069] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A large-scale speed control system for a marine diesel engine, characterized in that: The system comprises: The speed controller is used to collect the diesel engine speed signal and compare it with the set speed signal to form a speed deviation signal; Electro-hydraulic control mechanism, which realizes speed setting and adjustment through electro-hydraulic servo valve; A speed control device, used to receive the signal from the speed controller and adjust the current speed control signal; Flyweight, used to generate centrifugal force to control the movement of the spool; The speed regulating spring is used to balance the centrifugal force of the fly hammer and the preload force of the speed regulating spring. When there is an imbalance, an adjustment signal is sent synchronously. Slide valve mechanism, including flyweight assembly, slide valve assembly, plunger, spring and spring seat components; The descent mechanism includes a rotating shaft, a cam, and a lever to control the movement of the power cylinder; Compensation mechanism, used in conjunction with the slide valve mechanism; The spool of the sliding valve mechanism is controlled by the centrifugal force of the flyweight; Power output cylinder, including servo motor body, compensation adjustment needle valve, spring, power piston, oil seal and output shaft; The speed sensor is used to sense the speed of the diesel engine and feed it back to the electro-hydraulic control mechanism.

2. The large-scale speed regulating system for marine diesel engines according to claim 1, characterized in that: The speed controller inputs the speed deviation signal to the electro-hydraulic control mechanism and speed matching device as a signal after analog PID circuit operation and power amplification.

3. The large-scale speed regulating system for marine diesel engines according to claim 1, characterized in that: When the electro-hydraulic control mechanism loses power, the pressure is sensed and adjusted through the electro-hydraulic control mechanism, the slide valve mechanism, the compensation mechanism and the speed reduction mechanism.

4. The large-scale speed regulating system for marine diesel engines according to claim 1, characterized in that: The functions of the slide valve mechanism include: The centrifugal force of the flyweight is balanced with the preload of the speed regulating spring. When there is an imbalance, an adjustment signal is sent synchronously. Filter and reduce the speed pulsation signal and mechanical vibration signal transmitted by the diesel engine; Together with the buffer piston, buffer spring and compensation regulating needle valve, it realizes rapid stabilization of the entire speed control system.

5. The large-scale speed regulating system for marine diesel engines according to claim 1, characterized in that: When the diesel engine accelerates, the speed reduction mechanism controls the power cylinder to move upward, compresses the speed regulating spring, and makes the speed higher than the original set value; when the diesel engine decelerates, the speed reduction mechanism controls the power cylinder to move downward, and makes the speed lower than the original set value.

6. The large-scale speed regulating system for marine diesel engines according to claim 1, characterized in that: The functions of the power take-off cylinder include: Amplify various regulating signals of the speed regulator and output the final angular displacement; Adjust the opening of the compensation regulating needle valve to adjust the performance index of the diesel engine; The power piston drives the output shaft to rotate through the connecting rod, with sufficient torque to drive the diesel engine fuel control mechanism.

7. The large-scale speed regulating system for marine diesel engines according to claim 1, characterized in that: The electro-hydraulic mode senses the speed through a speed sensor and feeds it back to the electro-hydraulic control mechanism for speed setting and adjustment, so as to achieve simultaneous operation of the two systems, complete the actuator speed regulation action, adjust the circulating fuel supply of the diesel engine, and make the diesel engine operate at a stable speed.

8. The large-scale speed regulating system for marine diesel engines according to claim 1, characterized in that: The mechanical hydraulic part actively follows the electro-hydraulic part. In case of emergency, there is no need to switch modes, and the mechanical hydraulic mode operation is automatically realized.

9. The large-scale speed regulating system for marine diesel engines according to claim 1, characterized in that: The speed controller includes a digital signal processor for processing the output signal of the analog PID circuit to improve the response speed and control accuracy of the system.

10. The large-scale speed regulating system for a marine diesel engine according to claim 1, characterized in that: The system also includes a fault diagnosis module for monitoring the operating status of the speed control system, automatically alarming and providing troubleshooting guidance when an abnormality is detected, thereby ensuring stable operation of the system.

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