Dynamic balance device for branch resistance of ship cooling water system

Abstract

The invention provides a dynamic balance device for branch resistance of a ship cooling water system, which solves the problems of non-uniform flow distribution and the like caused by unbalanced resistance distribution of a traditional cooling water system and comprises a flow sensor, a temperature sensor, a variable-aperture throttling orifice plate and a controller. And the controller adopts a fuzzy self-adaptive PID control strategy based on the feedback of the flow and the temperature, generates a pulse signal by calculating the deviation between the real-time flow and the reference flow, accurately controls the rotation angle of the stepping motor, and dynamically adjusts the opening degree of the branch. The controller integrates a self-adaptive control strategy, dynamically adjusts fuzzy self-adaptive PID parameters according to errors, limits the flow deviation range, prevents system instability, and ensures flow distribution balance in combination with the mass balance principle. Closed-loop control is achieved through the high-precision flow sensor and the high-precision temperature sensor in combination with the variable-aperture throttling orifice plate, the fuzzy self-adaptive PID algorithm is adopted for dynamically optimizing the adjusting response, the distribution error of branch flow is reduced, and the cooling efficiency and the system reliability are improved.

Description

Technical Field

[0001] The present invention relates to the fields of ship engineering, fluid mechanics and automation control technology, and in particular to a branch resistance dynamic balancing device for a ship cooling water system. Background Art

[0002] A ship's cooling water system is a critical component for its normal operation. Its primary function is to provide cooling for the ship's engines, generators, heat exchangers, and other equipment, ensuring stable operation in high-temperature environments. The cooling water system absorbs heat generated by the equipment through circulating cooling water and transfers it to the cooler, dissipating the heat. Proper cooling water flow distribution is crucial to ensuring effective equipment cooling, and this flow distribution is affected by the resistance of each branch in the system. Therefore, the design of a ship's cooling water system must fully consider the balance of branch resistance to ensure that cooling water is properly distributed according to the equipment's cooling requirements.

[0003] Traditional marine cooling water systems typically use multiple branches to distribute cooling water to different equipment or areas. To achieve this flow distribution, traditional systems typically use fixed orifice plates or manually adjustable valves to control branch flow. Fixed orifice plates have a pre-set aperture and cannot be dynamically adjusted based on actual operating conditions. Manually adjustable valves, on the other hand, rely on manual experience to adjust the valve opening to achieve flow control. While these methods can achieve cooling water distribution to a certain extent, they have many limitations in practical application.

[0004] However, the fixed throttle orifice plates or manually adjustable valves used in traditional cooling water systems have significant drawbacks. On the one hand, the load and cooling requirements of a ship's equipment change under different navigation conditions, and fixed throttle orifices cannot adapt to these dynamic changes, resulting in irrational cooling water flow distribution and affecting the cooling effect of the equipment. On the other hand, manually adjustable valves rely on manual experience, have low debugging efficiency, lack precision, and are difficult to accurately control the flow rate. Furthermore, they struggle to adapt to the dynamically changing load and environmental conditions during actual navigation. Furthermore, factors such as pipeline aging and dirt accumulation can lead to uneven resistance in each branch, further exacerbating the uneven flow distribution, affecting the cooling effect of the equipment, and potentially even causing equipment failures, increasing maintenance costs and workload. Summary of the Invention

[0005] To address the aforementioned technical issues, a dynamic balancing device for branch resistance in a ship's cooling water system is provided. This device utilizes high-precision flow and temperature sensors, combined with a variable-aperture orifice plate, to achieve closed-loop control. It employs a fuzzy adaptive PID algorithm to dynamically optimize the regulation response. This device addresses the static regulation shortcomings of traditional cooling water systems, extends equipment life, improves navigation safety, and provides intelligent support for ship energy efficiency management.

[0006] The technical means adopted in the present invention are as follows:

[0007] A dynamic balancing device for branch resistance of a ship cooling water system is applied to a low-temperature fresh water system including a low-temperature fresh water cooler, an air cooler, a main engine cylinder jacket water cooler, and other coolers. The device is characterized by comprising: a variable aperture throttling orifice plate, a stepping motor, a flow sensor, a temperature sensor, and a controller, wherein:

[0008] The variable aperture throttling orifice plate is provided in plurality and is respectively provided at the inlet of each branch pipe connected to the air cooler, the main engine cylinder jacket water cooler and other coolers. The flow diameter matches the nominal diameter of the pipe and is used to adjust the opening in response to the control command;

[0009] The stepper motors are provided in plurality and are respectively connected to the variable aperture throttling orifice plates, and are used to drive the variable aperture throttling orifice plates to adjust the opening;

[0010] The flow sensors are provided in plurality and are respectively provided in the branch pipes between each variable aperture throttling orifice plate and the air cooler, the main engine cylinder jacket water cooler and other coolers, for real-time collection of the flow of each branch pipe;

[0011] The temperature sensors are provided in multiple locations, and are respectively provided in the air cooler, the main engine cylinder jacket water cooler and other coolers, for collecting the current temperature of each cooler in real time;

[0012] The controller is connected to the stepper motor, flow sensor and temperature sensor, and is used to receive flow and temperature data collected by the flow sensor and temperature sensor, generate control instructions, and send the instructions to the stepper motor to drive the variable aperture throttling orifice to adjust the opening, thereby controlling the flow of each branch pipeline and achieving dynamic balance of the flow of each branch.

[0013] Furthermore, after receiving the temperature data of each cooler, the controller dynamically adjusts the flow distribution ratio of each branch by changing the reference flow according to the cooling requirements of different equipment on the ship to ensure the optimal cooling effect.

[0014] Furthermore, the controller adopts a fuzzy adaptive PID control strategy. After receiving the real-time branch flow data collected by the flow sensors at the inlet of each branch, the controller calculates the real-time flow and the reference flow to obtain the flow deviation. The flow deviation is used as the input of the fuzzy adaptive PID controller to obtain the output pulse frequency of the fuzzy adaptive PID. The controller transmits the pulse signal to the driver of the stepper motor to accurately control the rotation angle of the stepper motor.

[0015] Furthermore, the controller has a built-in adaptive strategy to detect the deviation ΔQ formed between the sampled flow feedback value and the given flow reference value and the rate of change of the deviation As the input variable of the fuzzy controller, the fuzzy adaptive PID parameters are adjusted in real time, and the error can be limited to avoid excessive error causing system instability.

[0016] Furthermore, the cooling water branches in the low-temperature fresh water system comply with the mass balance principle. The sum of the flow rates of each branch is equal to the total flow rate of the parallel pipelines. The resistance losses of each branch are equal. The flow rate of each branch and the impedance of the branch satisfy:

[0017]

[0018] Where Q1 is the flow rate of the branch connected to the air cooler, Q2 is the flow rate of the branch connected to the main engine cylinder jacket water cooler, Q3 is the flow rate of the branch connected to other coolers, c1 is the impedance of the branch connected to the air cooler, c2 is the impedance of the branch connected to the main engine cylinder jacket water cooler, and c3 is the impedance of the branch connected to other coolers.

[0019] Furthermore, the flow sensor has a measuring range of 0 to 60 m 3 / h, the measurement accuracy is not less than ±0.5m 3 / h, and the response time does not exceed 1 second; the measurement accuracy of the temperature sensor is not less than ±0.5℃, and the response time does not exceed 2 seconds.

[0020] Furthermore, filters are installed at the branch inlets of the air cooler, main engine cylinder jacket water cooler and other coolers to filter impurities in the cooling water. The filtration accuracy is 50μm. The filter adopts a detachable design to facilitate regular cleaning by the staff. The pressure drop of the filter does not exceed 0.1MPa.

[0021] Furthermore, the ship cooling water system branch resistance dynamic balancing device also includes an alarm module, which is connected to the controller. When the flow of a branch of the ship cooling water system exceeds a preset range, the alarm module sends an audible and visual alarm signal to remind staff to inspect the waterway. The alarm module has audible and visual prompts and remote notification functions, and the remote notification is sent to the crew terminal through the ship monitoring system.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The present invention provides a dynamic balancing device for branch resistance of a ship cooling water system, which can solve the static adjustment defects of traditional cooling water systems, extend the life of equipment, improve navigation safety, and provide intelligent support for ship energy efficiency management.

[0024] 2. The present invention provides a dynamic balancing device for branch resistance of a ship cooling water system. By adopting high-precision flow sensors and temperature sensors, the flow of each branch and the temperature of the cooler are collected in real time, and the operating status of the cooling system is accurately monitored. This high-precision, fast-response monitoring method can obtain the operating data of the cooling water system in a timely and accurate manner, providing a reliable basis for subsequent intelligent control and ensuring the stability and reliability of the system operation.

[0025] 3. The present invention provides a dynamic balancing device for branch resistance of a ship cooling water system, which can quickly adjust the orifice plate opening according to the instructions of the controller, thereby dynamically changing the branch resistance and realizing flexible control of the flow of each branch. It solves the problem that traditional fixed throttling orifice plates cannot be dynamically adjusted, and improves the adaptability and flexibility of the system.

[0026] 4. The present invention provides a dynamic balancing device for branch resistance in a ship cooling water system. This device utilizes a fuzzy adaptive PID control strategy to dynamically adjust controller parameters based on flow deviation, optimizing regulatory response and improving control accuracy. The controller dynamically adjusts the fuzzy adaptive PID parameters based on the deviation between the real-time flow rate and the reference flow rate, preventing system instability caused by excessive errors. This control strategy automatically optimizes control parameters based on varying operating conditions, ensuring optimal flow distribution under all conditions, thereby enhancing the system's intelligence and control accuracy.

[0027] 5. The present invention provides a dynamic balancing device for branch resistance of a ship cooling water system, which integrates the principle of mass balance to ensure that the sum of the flow rates of each branch is equal to the total flow rate and the resistance losses of each branch are equal, thereby achieving balanced flow distribution and improving cooling efficiency. The design follows the basic principles of fluid mechanics to ensure that the distribution of cooling water in each branch is more uniform and reasonable, avoiding local overheating or insufficient cooling caused by uneven flow distribution, thereby improving the efficiency and reliability of the entire cooling system and extending the service life of the equipment.

[0028] 6. The present invention provides a dynamic balancing device for branch resistance of a ship cooling water system. Filters are installed at the entrance of each branch to filter impurities in the cooling water, which can effectively prevent impurities from entering the cooling system, reduce the risk of pipe blockage and equipment wear, and reduce the maintenance frequency and cost of the system.

[0029] 7. The present invention provides a dynamic balancing device for branch resistance of a ship cooling water system, which is connected to an alarm module through a controller to perform real-time monitoring and alarm of abnormal flow, thereby promptly detecting faults and ensuring system safety. It can promptly remind staff to inspect and handle faults in the early stages of a fault, avoid the expansion of the fault, ensure the safe operation of the ship's cooling system, and improve navigation safety.

[0030] Based on the above reasons, the present invention can be widely promoted in the fields of ship engineering, fluid mechanics and automatic control. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 This is a schematic diagram of the cooling water branch diversion structure of the ship's low-temperature fresh water system of the present invention.

[0033] Figure 2 This is the principle diagram of the fuzzy adaptive PID controller based on flow deviation of the present invention.

[0034] Figure 3 This is a schematic diagram of the cooling water branch diversion structure of a ship's low-temperature fresh water system equipped with an alarm module according to the present invention.

[0035] In the figure: 1. Variable aperture throttling orifice plate; 2. Stepper motor; 3. Flow sensor; 4. Temperature sensor; 5. Three-way valve; 6. Controller; 7. Low-temperature fresh water cooler; 8. Air cooler; 9. Main engine cylinder jacket water cooler; 10. Other coolers; 11. Filter; 12. Alarm module. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0037] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or apparatuses.

[0038] like Figure 1 As shown, the present invention provides a dynamic balancing device for branch resistance of a ship cooling water system, which is applied to a low-temperature fresh water system including a low-temperature fresh water cooler 7, an air cooler 8, a main engine jacket water cooler 9, and other coolers 10. In this embodiment, during the analysis process, it is assumed that the total flow of low-temperature fresh water in the entire low-temperature fresh water system remains relatively stable, and the cooling equipment in the system is reasonably simplified: only key heat exchange components such as the main engine jacket water cooler 9 and the air cooler 8 are retained, and other minor heat exchange devices are equivalent to a plate cooler (i.e., other coolers 10) for unified modeling. Seawater and fresh water flow through the low-temperature fresh water cooler 7 at the same time. The low-temperature seawater absorbs heat from the low-temperature fresh water and its temperature rises, while the low-temperature fresh water cools by releasing heat and its temperature drops accordingly. As the only heat exchange unit in the system that is in direct contact with seawater, the cooler undertakes the core heat exchange function. The low-temperature fresh water treated by the low-temperature fresh water cooler 7 is then diverted to cool other equipment on the ship, ensuring the thermal balance and efficient operation of the entire cooling circuit.

[0039] Based on the above-mentioned low-temperature fresh water system, the present invention provides a ship cooling water system branch resistance dynamic balancing device comprising: a variable aperture throttling orifice plate 1, a stepping motor 2, a flow sensor 3, a temperature sensor 4 and a controller 6, wherein:

[0040] The variable aperture throttling orifice plates 1 are provided in three pieces, which are respectively provided at the inlets of the branch pipes connected to the air cooler 8, the main engine cylinder jacket water cooler 9 and the other coolers 10. The flow diameter matches the nominal diameter of the pipe and is used to adjust the opening in response to the control command;

[0041] The stepper motors 2 are provided in three numbers and are respectively connected to the variable aperture throttling orifice plate 1 for driving the variable aperture throttling orifice plate 1 to adjust the opening. In this embodiment, the step angle of the stepper motor 2 is 1.8° and the response time does not exceed 50 milliseconds, thereby realizing rapid adjustment of the resistance of each branch.

[0042] The flow sensors 3 are provided in three pieces, which are respectively provided in the branch pipes between each variable aperture throttling orifice plate 1 and the air cooler 8, the main engine cylinder jacket water cooler 9 and the other coolers 10, for collecting the flow of each branch pipe in real time;

[0043] The temperature sensors 4 are provided in three pieces, which are respectively provided in the air cooler 8, the main engine cylinder jacket water cooler 9 and the other coolers 10, for collecting the current temperature of each cooler in real time;

[0044] The controller 6 is connected to the stepper motor 2, the flow sensor 3 and the temperature sensor 4, and is used to receive the flow and temperature data collected by the flow sensor 3 and the temperature sensor 4, generate control instructions, and send the instructions to the stepper motor 2 to drive the variable aperture throttling orifice 1 to adjust the opening, thereby controlling the flow of each branch pipeline and achieving dynamic balance of the flow of each branch.

[0045] In this embodiment, if Figure 1 As shown, a three-way valve 5 is also provided, with its inlet connected to the outlet of a low-temperature freshwater cooler 7. The low-temperature freshwater cooler 7 is the only heat exchange unit in the system that comes into direct contact with seawater. The low-temperature freshwater within it, after being cooled through heat exchange with the seawater, flows out of the outlet of the cooler 7 and into the inlet of the three-way valve 5. This connection ensures that the cooled low-temperature freshwater can smoothly enter the three-way valve 5, providing cooling medium for subsequent diversion operations. The two outlets of the three-way valve 5 are connected to different cooling water branches. The first outlet is connected to the inlet of the main engine jacket water cooler 9, a key component of the ship's cooling system, used to cool the main engine jacket water. The low-temperature freshwater distributed by the three-way valve 5 flows through this branch into the main engine jacket water cooler 9, providing cooling for it. The second outlet is connected to the inlet of an air cooler 8, another important cooling device used to cool air or other media requiring cooling. The three-way valve 5 distributes some of the low-temperature freshwater to this branch, providing cooling water for the air cooler 8 and ensuring its normal operation. The main function of three-way valve 5 is to distribute the low-temperature fresh water cooled by low-temperature fresh water cooler 7 to the main engine jacket water cooler 9 and air cooler 8 in a certain ratio. By adjusting the opening of three-way valve 5, the ratio of the cooling water flow into the two branches can be controlled to meet the cooling needs of different equipment.

[0046] In practice, as a preferred embodiment of the present invention, the controller 6 receives temperature data from each cooler and dynamically adjusts the flow distribution ratio of each branch by changing the reference flow rate based on the cooling requirements of different equipment on the ship, ensuring optimal cooling performance. In this embodiment, the dynamic adjustment algorithm is based on the priority of equipment cooling requirements and temperature deviation, and the adjustment period does not exceed 10 seconds.

[0047] When specifically implemented, as a preferred embodiment of the present invention, Figure 2As shown, the controller 6 adopts a fuzzy adaptive PID control strategy. After receiving the real-time branch flow data collected by the branch inlet flow sensor 3, the controller 6 calculates the real-time flow and the reference flow to obtain the flow deviation. The flow deviation is used as the input of the fuzzy adaptive PID controller to obtain the output pulse frequency of the fuzzy adaptive PID. The controller 6 transmits the pulse signal to the driver of the stepper motor 2 to accurately control the rotation angle of the stepper motor 2. In this embodiment, the parameters of the fuzzy adaptive PID controller include the proportional coefficient K p , integral coefficient K i and differential coefficient K d , the initial parameters can be set through the system self-calibration function.

[0048] In specific implementation, as a preferred embodiment of the present invention, the controller 6 has a built-in adaptive strategy to detect the deviation ΔQ formed by the sampled flow feedback value and the given flow reference value and the rate of change of the deviation As the input variable of the fuzzy controller, it can adjust the fuzzy adaptive PID parameters in real time and limit the error to avoid excessive error causing system instability. Figure 2 During operation, the difference ΔQ and the rate of change of the deviation are continuously detected. After adjustment and defuzzification by the fuzzy regulator, the three correction values of PID are obtained Correction value and PID parameter value K at the previous moment p-1 ,K i-1 ,K d-1 Perform superposition and combination to obtain the PID parameter value K at this moment p ,K i ,K d , thereby realizing the adaptive control of the system and avoiding system instability caused by excessive errors.

[0049] In specific implementation, as a preferred embodiment of the present invention, the cooling water branch in the low-temperature fresh water system complies with the mass balance principle, the sum of the flow rates of each branch is equal to the total flow rate of the parallel pipeline, the resistance loss of each branch is equal, and the flow rate of each branch and the impedance of the branch satisfy:

[0050]

[0051] Among them, Q1 is the flow rate of the branch connected to the air cooler 8, Q2 is the flow rate of the branch connected to the main engine cylinder jacket water cooler 9, Q3 is the flow rate of the branch connected to the other cooler 10, c1 is the impedance of the branch connected to the air cooler 8, c2 is the impedance of the branch connected to the main engine cylinder jacket water cooler 9, and c3 is the impedance of the branch connected to the other cooler 10.

[0052] In specific implementation, as a preferred embodiment of the present invention, the flow sensor 3 has a measuring range of 0 to 60 m 3 / h, the measurement accuracy is not less than ±0.5m 3 / h, and the response time does not exceed 1 second; the measurement accuracy of the temperature sensor 4 is not less than ±0.5°C, and the response time does not exceed 2 seconds.

[0053] In specific implementation, as a preferred embodiment of the present invention, filters 11 are installed at the branch inlets of the air cooler 8, the main engine cylinder jacket water cooler 9 and other coolers 10 to filter impurities in the cooling water. The filtration accuracy is 50μm. The filter 11 adopts a detachable design to facilitate regular cleaning by the staff. The pressure drop of the filter 11 does not exceed 0.1MPa, and the cleaning cycle is recommended to be once every 3 months.

[0054] In specific implementation, as a preferred embodiment of the present invention, the ship cooling water system branch resistance dynamic balancing device also includes an alarm module 12, and the alarm module 12 is connected to the controller 6. When the flow of a branch of the ship cooling water system exceeds a preset range (for example, lower than 80% of the minimum flow or higher than 120% of the maximum flow), the alarm module 12 sends an audible and visual alarm signal to remind the staff to inspect the waterway. The alarm module has audible and visual prompts and remote notification functions, and the remote notification is sent to the crew terminal through the ship monitoring system.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A ship cooling water system branch resistance dynamic balancing device, applied to a low-temperature fresh water system including a low-temperature fresh water cooler (7), an air cooler (8), a main engine cylinder jacket water cooler (9) and other coolers (10), characterized in that: include: A variable aperture throttling orifice plate (1), a stepping motor (2), a flow sensor (3), a temperature sensor (4) and a controller (6), wherein: The variable aperture throttling orifice plates (1) are provided in plurality and are respectively provided at the inlets of the branch pipes connected to the air cooler (8), the main engine cylinder jacket water cooler (9) and other coolers (10). The flow diameter matches the nominal diameter of the pipe and is used to adjust the opening in response to a control instruction. The stepping motors (2) are provided in plurality and are respectively connected to the variable aperture throttling orifice plate (1) for driving the variable aperture throttling orifice plate (1) to adjust the opening; The flow sensors (3) are provided in plurality and are respectively provided in branch pipes between each variable aperture throttling orifice plate (1) and the air cooler (8), the main engine cylinder jacket water cooler (9) and other coolers (10), for real-time collection of the flow of each branch pipe; The temperature sensors (4) are provided in a plurality and are respectively provided in the air cooler (8), the main engine cylinder jacket water cooler (9) and other coolers (10), and are used to collect the current temperature of each cooler in real time; The controller (6) is connected to the stepper motor (2), the flow sensor (3) and the temperature sensor (4), and is used to receive flow and temperature data collected by the flow sensor (3) and the temperature sensor (4), generate control instructions, and send the instructions to the stepper motor (2) to drive the variable aperture throttling orifice (1) to adjust the opening, thereby controlling the flow of each branch pipeline and achieving dynamic balance of the flow of each branch.

2. A dynamic balancing device for branch resistance of a ship cooling water system according to claim 1, characterized in that: After receiving the temperature data of each cooler, the controller (6) dynamically adjusts the flow distribution ratio of each branch by changing the reference flow according to the cooling requirements of different equipment on the ship, thereby ensuring the optimal cooling effect.

3. A dynamic balancing device for branch resistance of a ship cooling water system according to claim 2, characterized in that: The controller (6) adopts a fuzzy adaptive PID control strategy. After receiving the real-time branch flow data collected by the flow sensors (3) at the inlet of each branch, the controller (6) calculates the real-time flow and the reference flow to obtain a flow deviation. The flow deviation is used as the input of the fuzzy adaptive PID controller to obtain the output pulse frequency of the fuzzy adaptive PID. The controller (6) transmits the pulse signal to the driver of the stepper motor (2) to accurately control the rotation angle of the stepper motor (2).

4. A dynamic balancing device for branch resistance of a ship cooling water system according to claim 2, characterized in that: The controller (6) has a built-in adaptive strategy to detect the deviation ΔQ formed between the sampled flow feedback value and the given flow reference value and the rate of change of the deviation. As the input variable of the fuzzy controller, the fuzzy adaptive PID parameters are adjusted in real time, and the error can be limited to avoid excessive error causing system instability.

5. A dynamic balancing device for branch resistance of a ship cooling water system according to claim 1, characterized in that: The cooling water branches in the low-temperature fresh water system comply with the mass balance principle. The sum of the flow rates of each branch equals the total flow rate of the parallel pipes. The resistance losses of each branch are equal. The flow rate of each branch and the impedance of the branch satisfy: Wherein, Q1 is the flow rate of the branch connected to the air cooler (8), Q2 is the flow rate of the branch connected to the main engine cylinder jacket water cooler (9), Q3 is the flow rate of the branch connected to the other cooler (10), c1 is the impedance of the branch connected to the air cooler (8), c2 is the impedance of the branch connected to the main engine cylinder jacket water cooler (9), and c3 is the impedance of the branch connected to the other cooler (10).

6. A dynamic balancing device for branch resistance of a ship cooling water system according to claim 1, characterized in that: The flow sensor (3) has a measuring range of 0 to 60 m 3 / h, the measurement accuracy is not less than ±0.5m 3 / h, and the response time does not exceed 1 second; the measurement accuracy of the temperature sensor (4) is not less than ±0.5°C, and the response time does not exceed 2 seconds.

7. A dynamic balancing device for branch resistance of a ship cooling water system according to claim 1, characterized in that: Filters (11) are installed at the branch inlets of the air cooler (8), the main engine cylinder jacket water cooler (9) and the other coolers (10) for filtering impurities in the cooling water. The filters (11) are of detachable design.

8. A dynamic balancing device for branch resistance of a ship cooling water system according to claim 1, characterized in that: The ship cooling water system branch resistance dynamic balancing device further comprises an alarm module (12), which is connected to the controller (6). When the flow rate of a branch of the ship cooling water system exceeds a preset range, the alarm module (12) emits an audible and visual alarm signal to remind staff to inspect the waterway section.

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