Closed system speed control loop

Abstract

The utility model provides a closed system speed control loop. The loop comprises a closed pump, a load feedback module, a pressure compensation module, a proportional reversing valve and a split-flow cooling module. Wherein the closed pump is connected with the load feedback module and the pressure compensation module and used for providing low-pressure small-displacement flow output, the load feedback module is connected with the pressure compensation module and the execution mechanism and used for feeding back the load pressure of the execution mechanism, and the pressure compensation module is connected with the closed pump, the load feedback module and the execution mechanism and used for providing low-pressure small-displacement flow output. The proportional reversing valve is used for adjusting output flow according to load pressure, is connected with the executing mechanism and controls flow through the electromagnetic valve, and speed control over the executing mechanism is achieved.

Description

Technical Field

[0001] This application relates to the field of underwater hydraulic systems, and more specifically, to a closed-loop system speed control circuit. Background Technology

[0002] Due to space and environmental constraints, underwater equipment requires closed-loop pumps to drive hydraulic systems for high-flow-rate operations. Using open-loop pumps necessitates larger oil tanks, which is not feasible for some products. Furthermore, underwater hydraulic systems require protection of key control circuits to prevent corrosion and leakage. Currently, closed-loop control circuits for underwater applications face challenges in controlling the speed of multiple actions. During complex actions, inconsistent loads on different actuators can affect their speed, leading to insufficient control accuracy. Additionally, existing systems have room for improvement in energy efficiency.

[0003] Existing underwater hydraulic systems often struggle to simultaneously meet the requirements of precise control and energy efficiency. In situations involving multiple actions, uneven load distribution makes precise speed control of each actuator difficult. This lack of control precision leads to reduced operational efficiency of underwater equipment and may even affect its normal operation. Furthermore, traditional hydraulic systems tend to have high energy consumption, which is inconsistent with current trends in energy conservation and environmental protection.

[0004] Furthermore, existing underwater hydraulic systems often lack sufficient adaptability when facing complex working environments. For example, the system's performance may vary at different depths and pressures, affecting the stability and reliability of control. At the same time, due to the unique characteristics of the underwater environment, system maintenance and troubleshooting also present significant challenges. Utility Model Content

[0005] To overcome the shortcomings of the prior art, this utility model provides an embodiment of a closed-loop system speed control circuit, including a closed-loop pump, a load feedback module, a pressure compensation module, a proportional directional valve, and a flow-dividing cooling module. The closed-loop pump serves as the system power source and has a displacement control mechanism. The M2 port of the closed-loop pump is connected to the load feedback module.

[0006] Furthermore, the displacement control mechanism can adjust the output flow of the closed pump according to system requirements. When the system is started and all actuators are in the neutral position, a control pressure is applied to the X1 port of the closed pump, the displacement control mechanism swings, the main oil circuit establishes pressure, and the pressure oil returns to the pump through the M2 port and the load feedback module, forming a dynamic balance with the displacement control mechanism, so that the pump operates in a low-pressure, low-displacement state.

[0007] Furthermore, the load feedback module includes a sequence valve and an adjustable flow valve. The external hydraulic control port of the sequence valve is connected to the pressure compensation module, and the load feedback module is connected to the M2 port of the closed pump. When the actuator is activated, the pressure compensation module feeds back the highest load pressure to the external hydraulic control port of the sequence valve. The sequence valve ensures that the pressure at port A of the closed pump is always higher than the load pressure by a small value.

[0008] Furthermore, the pressure compensation module includes a pressure reducing valve and a shuttle valve. The shuttle valve is used to compare the load pressure of multiple actuators, and the pressure reducing valve ensures that the pressure difference across the proportional directional valve is constant. When multiple actuators operate simultaneously, the shuttle valve compares the load pressures and feeds back the highest pressure to the load feedback module. At the same time, the pressure reducing valve maintains a constant pressure difference across the proportional directional valve.

[0009] Furthermore, the proportional directional valve controls the action of the actuator, and its output flow is determined only by the magnitude of the solenoid valve current. The proportional directional valve works in conjunction with the pressure compensation module. When the actuator moves, the proportional directional valve switches positions. Because the pressure compensation module ensures that the pressure difference across the valve is constant, the output flow of the valve depends only on the magnitude of the solenoid valve current.

[0010] Furthermore, the diversion cooling module includes a one-way valve and an adjustable flow valve for system thermal management and flow control.

[0011] Furthermore, the action module includes an action one module, an action two module, and an action N module. The action one module is electrically connected to the first valve and the first control element, which are the first input signal sources. The action two module is electrically connected to the second valve and the second control element, which are the second input signal sources. The action N module is electrically connected to the third valve and the third control element, which are the third input signal sources.

[0012] Furthermore, in the load feedback module, the sequence valve regulates the pressure at port A of the closed pump based on the highest load pressure fed back by the pressure compensation module, ensuring that it is always a small value higher than the load pressure.

[0013] Furthermore, in the pressure compensation module, when multiple actuators operate simultaneously, the shuttle valve compares the load pressure of each actuator and feeds back the highest pressure to the load feedback module.

[0014] Furthermore, in the pressure compensation module, the pressure reducing valve maintains a constant pressure difference across the proportional directional valve during system operation, thus cooperating with the proportional directional valve to achieve control.

[0015] The closed-loop system speed control loop provided in the above embodiments has the following beneficial effects:

[0016] This utility model provides a closed-loop system speed control circuit. The system includes a closed-loop pump, a load feedback module, a pressure compensation module, a proportional directional valve, and a flow-dividing cooling module. Through the coordinated work of the closed-loop pump, the load feedback module, and the pressure compensation module, precise control of the actuator speed is achieved. At the same time, energy-saving effects are achieved through low-pressure, small-displacement operation and the flow-dividing cooling module. It has the advantages of improving control accuracy, achieving energy saving, and adapting to complex working environments. Attached Figure Description

[0017] 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A system block diagram of a closed-loop speed control loop provided for the first embodiment of this utility model;

[0019] Figure 2 This is a structural diagram of a closed-loop speed control circuit provided for the first embodiment of the present invention. Detailed Implementation

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

[0021] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] Example 1

[0024] refer to Figure 1 To address the aforementioned problems, this invention provides a closed-loop speed control system for underwater equipment, aiming to solve the speed control problem of multiple sets of actions and avoid affecting the speed of the actuator due to inconsistent loads. Existing technologies often suffer from inconsistent loads when performing complex actions, making it difficult to precisely control the speed of the actuator. Especially in underwater environments, hydraulic systems require efficient and precise control to avoid the adverse effects of space and environmental limitations.

[0025] A closed-loop speed control circuit includes a closed-loop pump, a load feedback module, a pressure compensation module, a proportional directional valve, and a flow-dividing cooling module. The closed-loop pump is connected to the load feedback module and the pressure compensation module to provide a low-pressure, small-displacement flow rate. The load feedback module is connected to the pressure compensation module and the actuator to provide feedback on the load pressure of the actuator. The pressure compensation module is connected to the closed-loop pump, the load feedback module, and the actuator to adjust the output flow rate according to the load pressure. The proportional directional valve is connected to the actuator and controls the flow rate via a solenoid valve to achieve speed control of the actuator.

[0026] The closed-loop pump provides low-pressure, small-displacement flow, ensuring stable system operation under varying load conditions. When the actuator is not in operation, the closed-loop pump outputs low pressure and small displacement to achieve energy savings and flush the internal oil passages, allowing internal circulation to generate heat. The load feedback module provides real-time feedback on the actuator's load pressure, ensuring consistent actuator speed under different load conditions. The pressure compensation module adjusts the output flow based on the feedback load pressure, guaranteeing system stability and accuracy during load changes. The proportional directional valve controls the flow rate via a solenoid valve, achieving precise control of the actuator speed. The diversion cooling module ensures temperature control during high-load operation, preventing overheating of critical components.

[0027] The main features of the closed-loop control system speed loop include: a closed-loop pump provides low-pressure, small-displacement flow to ensure stable system operation under different load conditions. When the actuator is not in operation, the closed-loop pump outputs low pressure and small displacement to achieve energy saving and flush the internal oil circuit of the closed-loop pump, allowing internal circulation to generate heat dissipation; a load feedback module provides real-time feedback on the load pressure of the actuator to ensure the speed consistency of the actuator under different load conditions; a pressure compensation module adjusts the output flow according to the feedback load pressure to ensure the stability and accuracy of the system when the load changes; a proportional directional valve controls the flow through a solenoid valve to achieve precise control of the actuator speed; and a flow-diverting cooling module ensures temperature control of the system under high load operation to prevent overheating of critical components.

[0028] In existing technologies, the speed control of multiple actuators is often affected by inconsistent loads, making it difficult to precisely control the speed of the actuator. This invention solves this technical problem by achieving precise speed control of the actuator through the coordinated operation of a closed-loop pump, a load feedback module, a pressure compensation module, and a proportional directional valve.

[0029] For example, in underwater equipment, a closed-loop pump provides low-pressure, small-displacement flow, a load feedback module provides real-time feedback on the load pressure of the actuator, a pressure compensation module adjusts the output flow based on the feedback load pressure, and a proportional directional valve controls the flow through a solenoid valve, achieving precise control of the actuator speed. A shunt cooling module ensures temperature control of the system under high load operation, preventing overheating of critical components.

[0030] Through the above technical solution, this utility model effectively solves the speed control problem of multiple sets of execution actions, avoids the situation where the speed of the actuator is affected by inconsistent load, and has a high energy-saving effect.

[0031] By configuring the load feedback module described above, this application enables real-time monitoring of the load pressure of each actuator and feeds back the highest load pressure to the pressure compensation module. Compared with existing technologies, this application achieves precise flow control through the coordinated operation of the load feedback module and the pressure compensation module, ensuring stable system operation under different load conditions and further improving system reliability and efficiency.

[0032] Furthermore, this application also proposes that the pressure compensation module is equipped with a shuttle valve, which is connected to different actuators and the load feedback module. The shuttle valve is used to compare the load pressure of different actuators and transmit the highest pressure to the load feedback module through the feedback loop, thereby adjusting the oil flow of each actuator.

[0033] The shuttle valve in the pressure compensation module compares the load pressures of different actuators and feeds back the highest pressure to the load feedback module. In this way, the system can adjust the oil flow of each actuator based on the highest load pressure, thus achieving precise control over different actuators. The shuttle valve design allows the system to dynamically respond to load changes in different actuators, ensuring that each actuator receives an appropriate flow supply when the load changes, thereby solving the problem of the system being unable to accurately adjust the oil flow of each actuator when the load pressures of different actuators are inconsistent. The shuttle valve design can be varied; for example, a hydraulically controlled shuttle valve can be used, which has a simple structure, rapid response, and is suitable for most hydraulic systems. Another implementation is to use an electrically controlled shuttle valve, which uses electrical signals to control the switching of the shuttle valve to achieve higher control precision. Furthermore, the shuttle valve can be integrated with a pressure sensor, which monitors the load pressure of different actuators in real time, and the electronic control system adjusts the state of the shuttle valve to achieve more precise flow regulation. Through the above designs, the problem of the system being unable to accurately adjust the oil flow of each actuator when the load pressures of different actuators are inconsistent can be effectively solved. Compared with existing technologies, the advantage of this application lies in its ability to dynamically respond to load changes in different actuators, ensuring that each actuator receives an appropriate flow supply when the load changes, thereby achieving precise control over different actuators. This design not only improves the control accuracy of the system but also enhances its stability and reliability.

[0034] Furthermore, this application proposes that a proportional directional valve controls flow through a solenoid valve. The solenoid valve is connected to the actuator, and its current is proportional to the output flow, thereby controlling the movement speed of each actuator. The solenoid valve adjusts the flow based on the input current, thus achieving precise control of the actuator speed. This design can precisely control the movement speed of each actuator in the hydraulic system by adjusting the current, ensuring that each actuator operates at the expected speed under different load conditions. As a preferred embodiment, the solenoid valve can achieve precise flow regulation through proportional control technology. Specifically, the solenoid valve receives a current signal from the controller and adjusts the valve core position according to the current magnitude, thereby controlling the flow rate. Further, a flow sensor can be installed between the solenoid valve and the actuator to monitor the flow rate in real time and feed the monitoring results back to the controller to achieve closed-loop control. Thus, the system can adaptively adjust according to actual conditions, improving control accuracy and response speed. Compared to existing technologies, the technical solution of this application achieves precise control of the actuator speed by controlling the flow rate through a solenoid valve. By adjusting the current, the movement speed of each actuator in the hydraulic system can be precisely controlled, ensuring that each actuator can operate at the expected speed under different load conditions. This solution not only improves the control accuracy of the system but also simplifies the system structure, reduces costs, and has high practical value.

[0035] Furthermore, this application also proposes that the system integrates the control components into the valve box through a modular design.

[0036] Integrating control components within the valve housing simplifies system design and improves system compactness and reliability. Modular design reduces installation and maintenance complexity while enhancing scalability. Integration of control components also effectively reduces piping connections, lowers leakage risk, and improves overall system efficiency. This integration can be achieved in various ways. For example, standardized control modules can be used, which can be combined and replaced as needed to achieve different functions. Specifically, the valve housing can integrate control components such as closed-loop pumps, load feedback modules, pressure compensation modules, proportional directional valves, and flow-diverting cooling modules. A well-planned layout and design ensures compact and reliable connections between modules, reducing piping length and quantity, thereby lowering the risk of leakage. Furthermore, high-performance sealing materials and advanced manufacturing processes ensure sealing performance at all connections, further reducing the likelihood of leakage.

[0037] This application simplifies the system's structural design and improves its compactness and reliability by integrating the control components within the valve box. Compared to existing technologies, this application reduces piping connections, lowers the risk of leakage, and improves the overall system efficiency. The modular design also reduces installation and maintenance complexity and enhances system scalability. Overall, this application provides a more efficient and reliable closed-loop control system speed loop.

[0038] Furthermore, this application proposes that the system integrates control components within the valve box through a modular design. This modular design effectively optimizes the system structure, making the system more compact, reducing space requirements, and improving system reliability. Modular design allows for better collaboration among control components, reducing connection complexity and lowering the failure rate. Specifically, integrating control components into the valve box reduces the use of external piping, lowers leakage risk, and simplifies maintenance and repair. Consequently, the overall system performance and reliability are significantly improved. Control components can be designed and manufactured using standardized modules, simplifying the production process and facilitating subsequent upgrades and replacements. For example, key components such as proportional directional valves and pressure compensation modules can be designed as standardized modules and directly installed within the valve box. Furthermore, the valve box can be designed with a multi-layered structure, with each layer connected via built-in oil circuits, reducing the use of external connecting pipelines. Meanwhile, the valve box can be made of high-strength, corrosion-resistant alloy materials to meet the requirements of the underwater environment. The system of this application integrates control components within the valve box through modular design in the closed-loop control system speed loop, optimizing the system structure and improving its compactness and reliability. Compared to existing technologies, the system of this application has significant advantages in reducing space occupation, lowering connection complexity, reducing failure rate, and improving maintenance convenience. Therefore, the technical solution of this application is of great significance in improving system performance and reliability.

[0039] Furthermore, this application proposes that the diversion cooling module is connected to key components such as pumps and valve assemblies to reduce the temperature during system operation. Through the flow of circulating coolant, it ensures that key components such as pumps and valve assemblies do not overheat under high loads. The diversion cooling module, connected to key components, effectively dissipates heat and prevents overheating by utilizing the flow of circulating coolant, thereby ensuring stable system operation and extending the lifespan of key components. The implementation of the diversion cooling module can include, but is not limited to, the following: First, the diversion cooling module can employ a built-in cooling circuit, using a pump to introduce coolant into the cooling module for circulating cooling; second, the diversion cooling module can have multiple coolant inlets and outlets to increase the flow path of the coolant and improve cooling efficiency; third, the diversion cooling module can also be designed with a temperature control device, automatically adjusting the flow rate and temperature of the coolant by monitoring the temperature of key components to achieve more precise temperature control. By employing a split-flow cooling module, this application effectively solves the problem of excessively high temperatures during system operation, ensuring the normal operation of critical components such as pumps and valve assemblies under high loads, extending the service life of critical components, and improving the stability and reliability of the system. Compared with existing technologies, this application significantly improves the system's heat dissipation efficiency by introducing a split-flow cooling module, avoiding system failures and performance degradation caused by overheating.

[0040] Furthermore, this application proposes that the closed-loop pump system, through linkage with an external load feedback module and a pressure compensation module, is connected to each actuator to adjust the oil flow rate according to the load changes of each actuator. The closed-loop pump system achieves connection with each actuator through linkage with the external load feedback module and pressure compensation module. The load feedback module monitors the load pressure of each actuator in real time and feeds back the highest load pressure to the pressure compensation module. The pressure compensation module adjusts the output flow rate of the closed-loop pump according to the feedback load pressure, thereby precisely regulating the oil flow rate. In this way, the system can dynamically adjust the oil flow rate according to the load changes of each actuator, ensuring stable operation of each actuator under different load conditions and avoiding actuator speed variations caused by inconsistent loads. The closed-loop pump system monitors the load pressure of each actuator in real time through the load feedback module and feeds back the highest load pressure to the pressure compensation module. The pressure compensation module adjusts the output flow rate of the closed-loop pump according to the feedback load pressure. Further, the load feedback module may include one or more load pressure sensors connected to each actuator to monitor the load pressure of each actuator in real time. The pressure compensation module includes a shuttle valve connected to different actuators and the load feedback module. This shuttle valve compares the load pressures of different actuators and transmits the highest pressure to the load feedback module via a feedback loop. This allows for more precise adjustment of the oil flow rate, ensuring stable operation of each actuator under varying load conditions. Through the linkage of the closed-loop pump system with the external load feedback and pressure compensation modules, the function of adjusting the oil flow rate according to load changes in each actuator is achieved. Compared to existing technologies, this application can dynamically adjust the oil flow rate, ensuring stable operation of each actuator under different load conditions, avoiding speed variations caused by inconsistent loads, and improving the system's control accuracy and stability. Furthermore, by monitoring and feeding back the highest load pressure in real time, the system's response speed and control effect are further improved.

[0041] Furthermore, this application proposes a highly integrated modular structure for the system. The output flow of the closed-loop pump is based on the actuator with the highest load, and precise control is achieved by controlling the flow. This highly integrated modular structure plays a crucial role in solving the problem of precise speed control for multiple actuator actions in underwater environments. By using the output flow of the closed-loop pump as a reference for the actuator with the highest load, this structure ensures precise speed control of the actuator even under inconsistent loads. This design not only improves the accuracy of speed control but also has high energy efficiency, making it suitable for use in underwater equipment with limited space and environment. By controlling the flow, the impact of inconsistent loads on the actuator speed during complex actions is effectively avoided, thus achieving more precise speed control for multiple actuator actions.

[0042] The closed-loop pump system, linked to an external load feedback module and pressure compensation module, is connected to each actuator and adjusts the oil flow rate according to the load changes of each actuator. The load feedback module includes a load pressure sensor connected to each actuator to monitor its load pressure in real time. This sensor is also connected to the pressure compensation module, feeding back the highest load pressure. The pressure compensation module contains a shuttle valve connected to different actuators and the load feedback module. This shuttle valve compares the load pressures of different actuators and transmits the highest pressure back to the load feedback module via a feedback loop, thereby adjusting the oil flow rate of each actuator. A proportional directional valve controls the flow rate via a solenoid valve connected to the actuator. The solenoid valve's current is proportional to the output flow rate, thus controlling the movement speed of each actuator. The system employs a modular design, integrating the control components within the valve box.

[0043] Therefore, based on existing technologies, this application solves the problem of precise speed control for multiple sets of actions in underwater environments by adopting a highly integrated modular structure and closed-loop pump output flow control technology. Compared with existing technologies, this application achieves precise control while exhibiting higher energy efficiency, making it suitable for use in underwater equipment with limited space and environment. By controlling the flow rate, the impact of inconsistent loads on the actuator speed during complex actions is effectively avoided, thus achieving more precise speed control for multiple sets of actions.

[0044] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A closed-loop speed control circuit, characterized in that, It includes a closed-loop pump, a load feedback module, a pressure compensation module, a proportional directional valve, a flow splitting cooling module, and an actuation module. The closed-loop pump serves as the system's power source and includes a displacement control mechanism. The M2 port of the closed-loop pump is connected to the load feedback module.

2. The closed-loop system speed control loop according to claim 1, characterized in that, The displacement control mechanism can adjust the output flow of the closed pump according to system requirements. When the actuator is in the neutral position, control pressure is applied to the X1 port of the closed pump, the displacement control mechanism swings, the main oil circuit establishes pressure, and the pressure oil returns to the regulating closed pump through the M2 port and the load feedback module.

3. The closed-loop system speed control loop according to claim 1, characterized in that, The load feedback module includes a sequence valve and an adjustable flow valve. The external hydraulic control port of the sequence valve is connected to the pressure compensation module, and the load feedback module is connected to the M2 port of the closed pump. When the actuator is activated, the pressure compensation module feeds back the highest load pressure to the external hydraulic control port of the sequence valve. The sequence valve ensures that the pressure at port A of the closed pump is always higher than the load pressure by a small value.

4. The closed-loop system speed control loop according to claim 1, characterized in that, The pressure compensation module includes a pressure reducing valve and a shuttle valve. The shuttle valve is used to compare the load pressure of the actuator, and the pressure reducing valve ensures that the pressure difference across the proportional directional valve is constant. When the actuators operate simultaneously, the shuttle valve compares the load pressures and feeds back the highest pressure to the load feedback module.

5. The closed-loop system speed control loop according to claim 1, characterized in that, The proportional directional valve controls the action of the actuator. Its output flow is determined only by the magnitude of the solenoid valve current. The proportional directional valve works in conjunction with the pressure compensation module. When the actuator moves, the proportional directional valve switches positions.

6. The closed-loop system speed control loop according to claim 1, characterized in that, The split cooling module includes a one-way valve and an adjustable flow valve.

7. The closed-loop system speed control loop according to claim 1, characterized in that, The action module includes an action one module, an action two module, and an action N module. The first action module is electrically connected to the first valve and the first control element, wherein the valve and the control element are the first input signal sources; The second action module is electrically connected to the second valve and the second control element, which are the second input signal sources. The action N module is electrically connected to the third valve and the third control element, which are the third input signal sources.

8. The closed-loop system speed control loop according to claim 3, characterized in that, The sequence valve, located in the load feedback module, regulates the pressure at port A of the closed pump based on the highest load pressure fed back by the pressure compensation module.

9. The closed-loop system speed control loop according to claim 4, characterized in that, In the pressure compensation module, the shuttle valve compares the load pressure of the actuator and feeds back the highest pressure to the load feedback module.

10. The closed-loop system speed control loop according to claim 4, characterized in that, The pressure reducing valve, located in the pressure compensation module, maintains a constant pressure difference across the proportional directional valve during system operation, thus cooperating with the proportional directional valve to achieve control.

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