Ship turbine cooling device and method

Abstract

The invention provides a ship turbine cooling device and method, and relates to the technical field of ship turbine cooling. The circulating driving module comprises a variable-frequency circulating pump; the heat exchange module comprises a heat exchange pipe which is wound on the outer side of a cylinder body of the ship turbine; the temperature control module comprises a temperature sensor and a control unit, the temperature sensor is connected with the cylinder body, and the control unit is used for controlling operation of the variable-frequency circulating pump according to a detection result of the temperature sensor and controlling the variable-frequency circulating pump to operate at a first rotating speed when the detection result is smaller than a lower limit value of a set temperature threshold value; when the detection result is within the set temperature threshold range, the variable-frequency circulating pump is controlled to conduct temperature linear adjustment according to the detection result, and when the detection result is larger than the upper limit value of the set temperature threshold, the variable-frequency circulating pump is controlled to operate at the second rotating speed; the problems that in the prior art, in ship turbine cooling and heat dissipation, cooling reliability is insufficient, and economical efficiency is poor are solved.

Description

Technical Field

[0001] This invention belongs to the field of marine engine cooling technology, and more specifically, relates to a marine engine cooling device and method. Background Technology

[0002] During full-condition operation, the power load of marine engines can fluctuate between 30% and 100%, resulting in significant variations in their heat dissipation requirements. Currently, there is a lack of a simple, intelligently adaptable, energy-efficient cooling method for marine engines. Existing cooling methods for marine engines rely on constant-speed circulating pumps, resulting in a constant coolant flow rate or valve-regulated operation. This leads to lag in response and can easily cause localized overheating or overcooling of the engine block, affecting operational reliability and economy. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a ship engine cooling device and method, thereby solving the problems of insufficient cooling reliability and poor economy in existing ship engine cooling and heat dissipation technologies.

[0004] To achieve the above objectives, the present invention provides a marine engine cooling device, the device comprising: A liquid storage module, the liquid storage module including a cooling water tank; A circulation drive module, the circulation drive module including a variable frequency circulation pump, the variable frequency circulation pump being connected to the cooling water tank; A heat exchange module, comprising a heat exchange tube wound around the outside of the cylinder of a marine engine, the heat exchange tube being connected to the variable frequency circulating pump; The temperature control module includes a temperature sensor and a control unit. The temperature sensor is connected to the cylinder block and the control unit. The control unit controls the operation of the variable frequency circulating pump based on the detection result of the temperature sensor. When the detection result is less than the lower limit of a set temperature threshold, the variable frequency circulating pump is controlled to run at a first speed. When the detection result is within the set temperature threshold range, the variable frequency circulating pump is controlled to perform linear temperature adjustment based on the detection result. When the detection result is greater than the upper limit of the set temperature threshold, the variable frequency circulating pump is controlled to run at a second speed.

[0005] Optionally, the set temperature threshold is not less than 60℃ and not greater than 80℃, the first rotational speed is 500-1500 r / min, and when the control unit controls the variable frequency circulating pump to perform linear temperature adjustment according to the detection result, the rotational speed adjustment coefficient is 0.8-1.2 r / (min). (℃), the second rotational speed is 2500-3000 r / min.

[0006] Optionally, the control unit is connected to the controller of the ship's engine, and the control unit can control the variable frequency circulating pump to run for a set time delay after the ship's engine stops.

[0007] Optionally, the top of the cooling water tank is provided with a water inlet, the water inlet is provided with a filter screen, the bottom of the cooling water tank is provided with a drain valve, and the interior of the cooling water tank is provided with a level gauge.

[0008] Optionally, the speed adjustment range of the variable frequency circulating pump is 500-3000 r / min, and the variable frequency circulating pump is connected to the heat exchange tube through a flexible pipeline.

[0009] Optionally, the heat exchange tube is a copper spiral tube, and the heat exchange tube is connected to the cylinder body in close contact via a thermally conductive silicone pad.

[0010] Optionally, it also includes a thermal insulation layer that wraps around the outside of the cylinder body to which the heat exchange tube is wound.

[0011] Optionally, the temperature sensor is embedded in a temperature measuring hole on the cylinder.

[0012] The present invention also provides a method for cooling marine engines, utilizing the aforementioned marine engine cooling device, the method comprising: Set the set temperature threshold for the cylinder block of the ship's engine; The temperature of the cylinder is detected by a temperature sensor; When the temperature sensor reading is lower than the lower limit of the set temperature threshold, the variable frequency circulating pump is controlled to run at the first speed. When the temperature sensor detects a value within the set temperature threshold range, the variable frequency circulating pump is controlled to linearly adjust the temperature according to the sensor's detection results. When the temperature sensor reading exceeds the upper limit of the set temperature threshold, the variable frequency circulating pump is controlled to run at the second speed.

[0013] Optionally, when the temperature sensor reading is less than 60℃, the variable frequency circulating pump is controlled to operate at a speed of 500-1500 r / min; when the temperature sensor reading is not less than 60℃ and not greater than 80℃, the variable frequency circulating pump is controlled according to a speed adjustment coefficient of 0.8-1.2 r / (min). The temperature is linearly regulated (℃); when the temperature sensor reading is greater than 80℃, the variable frequency circulating pump is controlled to run at a speed of 2500-3000 r / min.

[0014] This invention provides a cooling device and method for marine engines, with the following advantages: The cooling device stores coolant in a cooling water tank of a storage module. Driven by a variable frequency circulating pump in a circulation drive module, the circulating water circulates in the heat exchange tubes of a heat exchange module. Cooling of the marine engine is achieved through heat exchange between the heat exchange tubes and the engine block. During cooling, a temperature sensor detects the temperature of the engine block, and the control unit adjusts the speed of the variable frequency circulating pump based on the sensor's reading, thereby regulating the coolant circulation flow rate. This method does not rely on valve flow control, resulting in fast response and high cooling reliability. When the temperature sensor reading is lower than the lower limit of a set temperature threshold, the variable frequency circulating pump is controlled to operate at a higher speed. The system operates at a low speed, with the coolant flow rate at 30%-50% of the rated flow rate. This meets the cooling requirements of the ship's engines under low-temperature conditions and avoids energy and cost waste. When the temperature sensor reading is within the set temperature threshold range, the system controls the variable frequency circulating pump to linearly adjust the temperature based on the sensor reading. This causes the pump's speed to increase linearly as the reading rises, further ensuring that the coolant's cooling effect on the cylinder increases with the cylinder temperature. When the temperature sensor reading exceeds the upper limit of the set temperature threshold, the system controls the variable frequency circulating pump to operate at a high speed to reach the rated flow rate. This ensures that the coolant quickly removes heat and prevents the ship's engines from overheating.

[0015] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] The above and other objects, features and advantages of the present invention will become more apparent from the more detailed description of exemplary embodiments of the invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the invention.

[0017] Figure 1 A schematic diagram of a ship engine cooling device according to an embodiment of the present invention is shown.

[0018] Figure 2 A flowchart of a ship engine cooling method according to an embodiment of the present invention is shown.

[0019] Explanation of reference numerals in the attached figures: 1. Liquid storage module; 2. Circulation drive module; 3. Heat exchange module; 4. Temperature sensor; 5. Control unit; 6. Cylinder; 7. Controller. Detailed Implementation

[0020] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0021] like Figure 1 As shown, the present invention provides a ship engine cooling device, the device comprising: Liquid storage module 1, which includes a cooling water tank; Circulation drive module 2, which includes a variable frequency circulation pump connected to a cooling water tank; Heat exchange module 3 includes heat exchange tubes, which are wound around the outside of the cylinder 6 of the ship's engine and connected to a variable frequency circulating pump. The temperature control module includes a temperature sensor 4 and a control unit 5. The temperature sensor 4 is connected to the cylinder block 6 and the control unit 5. The control unit 5 is used to control the operation of the variable frequency circulating pump according to the detection result of the temperature sensor 4. When the detection result is less than the lower limit of the set temperature threshold, the variable frequency circulating pump is controlled to run at a first speed. When the detection result is within the set temperature threshold range, the variable frequency circulating pump is controlled to perform linear temperature adjustment according to the detection result. When the detection result is greater than the upper limit of the set temperature threshold, the variable frequency circulating pump is controlled to run at a second speed.

[0022] Specifically, to address the problems of insufficient cooling reliability and poor economy in existing ship engine cooling systems, the ship engine cooling device provided by this invention stores coolant in the cooling water tank of the storage module 1. Driven by the variable frequency circulating pump of the circulation drive module 2, the circulating water circulates in the heat exchange tubes of the heat exchange module 3. Cooling of the ship engine is achieved through heat exchange between the heat exchange tubes and the cylinder 6 of the ship engine. During the cooling process, the temperature sensor 4 detects the temperature of the cylinder 6, and the control unit 5 adjusts the speed of the variable frequency circulating pump based on the detection result of the temperature sensor 4, thereby adjusting the circulation flow rate of the coolant. This system does not rely on valve flow control, resulting in fast response and high cooling reliability. When the detection result of the temperature sensor 4 is lower than the lower limit of the set temperature threshold... At the same time, the variable frequency circulating pump is controlled to operate at a low speed with a first speed, and the coolant flow rate is 30%-50% of the rated flow rate to meet the cooling requirements of the ship's engine under low temperature conditions and avoid energy and cost waste. When the detection result of temperature sensor 4 is within the set temperature threshold range, the variable frequency circulating pump is controlled to adjust the temperature linearly according to the detection result of temperature sensor 4, so that the speed of the variable frequency circulating pump increases linearly as the detection result increases, further ensuring that the cooling degree of the coolant on the cylinder 6 increases as the temperature of the cylinder 6 increases. When the detection result of temperature sensor 4 is greater than the upper limit of the set temperature threshold, the variable frequency circulating pump is controlled to operate at a high speed with a second speed to reach the rated flow rate, ensuring that the coolant quickly removes heat and avoids overheating of the ship's engine.

[0023] Optionally, the temperature threshold is set to be no less than 60℃ and no more than 80℃, the first rotational speed is 500-1500 r / min, and when the control unit 5 controls the variable frequency circulating pump to linearly adjust the temperature according to the detection results, the rotational speed adjustment coefficient is 0.8-1.2 r / (min). (℃), the second rotation speed is 2500-3000 r / min.

[0024] Specifically, the lower and upper limits of the set temperature thresholds are set to 60℃ and 80℃ respectively, i.e., 60℃ for low load and 80℃ for high load. Control unit 5 can be a PLC, which outputs a speed control signal to the variable frequency circulating pump via a PID algorithm. When the variable frequency circulating pump operates at a low speed (first speed), its speed is set within the range of 500-1500 r / min. When the variable frequency circulating pump operates at a high speed (second speed), its speed is set within the range of 2500-3000 r / min. When control unit 5 controls the variable frequency circulating pump to linearly adjust the temperature based on the detection results of temperature sensor 4, the speed adjustment coefficient is 0.8-1.2 r / (min). For every 1°C increase in temperature, the speed of the variable frequency circulating pump increases linearly by the corresponding amount, which ensures cooling efficiency, improves cooling heat dissipation reliability, reduces cooling operation load, and saves energy and costs.

[0025] Optionally, the control unit 5 is connected to the controller 7 of the ship's engine, and the control unit 5 can control the variable frequency circulating pump to run for a set time after the ship's engine stops.

[0026] Specifically, after the ship's engine stops, the control unit 5 receives the shutdown signal from the controller 7, and the control unit 5 triggers a delayed shutdown procedure to perform residual heat cooling.

[0027] In this embodiment, the set duration is 5-10 minutes. During this process, the control unit 5 continues to control the operation of the ship's engine cooling device in the manner described above.

[0028] Optionally, a water inlet is provided at the top of the cooling water tank, a filter screen is provided inside the water inlet, a drain valve is provided at the bottom of the cooling water tank, and a level gauge is provided inside the cooling water tank.

[0029] Specifically, the cooling water tank can be made of stainless steel, with a volume matched to the ship's engine power of 1L / kW, and a level gauge installed on the inner wall to monitor the remaining coolant level in real time.

[0030] In this embodiment, the cooling water tank has a thickness of 3-5mm, a volume of 50-200L, a filter screen aperture of no more than 2mm, a DN20-DN32 drain ball valve at the bottom, and an epoxy resin anti-corrosion coating on the inner wall of the cooling water tank.

[0031] Optionally, the speed adjustment range of the variable frequency circulating pump is 500-3000 r / min, and the variable frequency circulating pump is connected to the heat exchange tube through a flexible pipeline.

[0032] Specifically, the variable frequency circulating pump adopts a marine explosion-proof variable frequency circulating pump with an IP55 protection rating, a rated voltage of 380V / 50Hz, a power of 0.5-2.2kW, and a speed adjustment range of 500-3000r / min. It has anti-cavitation and low noise characteristics. It is connected to the pipeline through a stainless steel corrugated pipe to reduce vibration transmission. The variable frequency circulating pump is fixed and damped by rubber shock-absorbing pads and is installed on a bracket in the engine room. The interface is equipped with a sealing gasket with a temperature resistance of not less than 120℃.

[0033] Optionally, the heat exchange tube is a copper spiral tube, and the heat exchange tube is connected to the cylinder 6 in contact with the thermally conductive silicone pad.

[0034] Specifically, the thermal conductivity of the copper heat exchange tubes should be no less than 380 W / (m²). K), tube diameter 8-15mm, wall thickness 1.2-2.0mm, helix angle 15°-30°, spacing 5-10mm, attached to cylinder 6 by thermally conductive silicone pad, customized according to cylinder 6 size, fixed by stainless steel clips at 100-150mm intervals, thermally conductive silicone pad thickness 2-3mm, ensuring that the gap between heat exchange tube and cylinder 6 is ≤0.5mm.

[0035] Optionally, it also includes an insulation layer that wraps around the outside of the cylinder 6 to which the heat exchange tubes are wound.

[0036] Specifically, the insulation layer can be made of rock wool with a thickness of 10-15mm to reduce heat loss, and is protected by an outer layer of aluminum foil.

[0037] Optionally, the temperature sensor 4 is embedded in the temperature measuring hole on the cylinder block 6.

[0038] Specifically, temperature sensor 4 can be a PT100 platinum resistance temperature sensor with a measurement range of 0-200℃ and an accuracy of ±0.5℃; control unit 5 can be a PLC, marine grade, resistant to electromagnetic interference, and equipped with a touch panel; temperature sensor 4 is embedded in the temperature measuring hole of cylinder 6 at a depth of 15-20mm, close to the combustion chamber; control unit 5 is fixed in the control box; touch panel is embedded in the control console; temperature threshold can be adjusted via panel buttons; it also has a temperature over-limit alarm function, providing audible and visual alarms, as well as pump overload protection; control unit 5 and variable frequency circulating pump can be connected via Modbus communication protocol to achieve real-time signal interaction.

[0039] In this embodiment, the coolant is a 50% ethylene glycol aqueous solution with a freezing point of ≤-35℃. The injection volume is 80%-90% of the cooling water tank volume. Before the first use, the pipeline is flushed to remove impurities.

[0040] like Figure 2 As shown, the present invention also provides a method for cooling marine engines, utilizing the aforementioned marine engine cooling device, the method comprising: Set the set temperature threshold for the cylinder 6 of the ship's engine; The temperature of cylinder 6 is detected by temperature sensor 4; When the detection result of temperature sensor 4 is less than the lower limit of the set temperature threshold, the variable frequency circulating pump is controlled to run at the first speed. When the detection result of temperature sensor 4 is within the set temperature threshold range, the variable frequency circulating pump is controlled to perform linear temperature adjustment according to the detection result of temperature sensor 4. When the temperature sensor 4 detects a value greater than the upper limit of the set temperature threshold, the variable frequency circulating pump is controlled to run at the second speed.

[0041] Optionally, when the temperature sensor 4 detects a temperature less than 60°C, the variable frequency circulating pump is controlled to operate at a speed of 500-1500 r / min; when the temperature sensor 4 detects a temperature not less than 60°C and not greater than 80°C, the variable frequency circulating pump is controlled according to a speed adjustment coefficient of 0.8-1.2 r / (min). Temperature is linearly regulated (℃); when the temperature sensor 4 detects a value greater than 80℃, the variable frequency circulating pump is controlled to run at a speed of 2500-3000 r / min.

[0042] Specifically, this ship engine cooling method utilizes the aforementioned ship engine cooling device and employs a temperature-flow closed-loop control logic. Temperature sensor 4 collects the temperature signal of the ship engine cylinder 6 in real time and transmits it to control unit 5. Control unit 5 compares the detection result of temperature sensor 4 with a set temperature threshold and outputs a speed regulation signal to the variable frequency circulating pump via a PID algorithm to adjust its speed. When the detection result is <60℃, the variable frequency circulating pump operates at a low speed of 500-1500 r / min, with a coolant flow rate of 30%-50% of the rated flow rate. When 60℃ ≤ detection result ≤ 80℃, the variable frequency circulating pump speed is linearly adjusted with temperature, with a speed adjustment coefficient of 0.8-1.2 r / (min). (℃); When the test result is >80℃, the variable frequency circulating pump runs at a high speed of 2500-3000r / min to ensure that the coolant quickly removes heat; After the ship's engine stops, the control unit 5 triggers the delayed shutdown program, with a delay time of 5-10 minutes, to achieve residual heat cooling; The spiral heat exchange tube is attached to the cylinder 6 through a thermally conductive silicone pad, increasing the heat exchange area and improving the heat exchange efficiency, which is 25%-40% higher than that of the traditional straight tube type.

[0043] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A marine engine cooling device, characterized in that, The device includes: A liquid storage module, the liquid storage module including a cooling water tank; A circulation drive module, the circulation drive module including a variable frequency circulation pump, the variable frequency circulation pump being connected to the cooling water tank; A heat exchange module, comprising a heat exchange tube wound around the outside of the cylinder of a marine engine, the heat exchange tube being connected to the variable frequency circulating pump; The temperature control module includes a temperature sensor and a control unit. The temperature sensor is connected to the cylinder block and the control unit. The control unit controls the operation of the variable frequency circulating pump based on the detection result of the temperature sensor. When the detection result is less than the lower limit of a set temperature threshold, the variable frequency circulating pump is controlled to run at a first speed. When the detection result is within the set temperature threshold range, the variable frequency circulating pump is controlled to perform linear temperature adjustment based on the detection result. When the detection result is greater than the upper limit of the set temperature threshold, the variable frequency circulating pump is controlled to run at a second speed.

2. The marine engine cooling device according to claim 1, characterized in that, The set temperature threshold is not less than 60℃ and not greater than 80℃, the first rotational speed is 500-1500 r / min, and when the control unit controls the variable frequency circulating pump to perform linear temperature adjustment according to the detection result, the rotational speed adjustment coefficient is 0.8-1.2 r / (min). (℃), the second rotational speed is 2500-3000 r / min.

3. The marine engine cooling device according to claim 1, characterized in that, The control unit is connected to the controller of the ship's engine, and the control unit can control the variable frequency circulating pump to run for a set time delay after the ship's engine stops.

4. The marine engine cooling device according to claim 1, characterized in that, The cooling water tank is equipped with a water inlet at the top, a filter screen inside the water inlet, a drain valve at the bottom, and a level gauge inside the cooling water tank.

5. The marine engine cooling device according to claim 1, characterized in that, The speed adjustment range of the variable frequency circulating pump is 500-3000 r / min, and the variable frequency circulating pump is connected to the heat exchange tube through a flexible pipeline.

6. The marine engine cooling device according to claim 1, characterized in that, The heat exchange tube is a copper spiral tube, and the heat exchange tube is connected to the cylinder body in close contact via a thermally conductive silicone pad.

7. The marine engine cooling device according to claim 1, characterized in that, It also includes a heat insulation layer, which wraps around the outside of the cylinder body to which the heat exchange tube is wound.

8. The marine engine cooling device according to claim 1, characterized in that, The temperature sensor is embedded in the temperature measuring hole on the cylinder.

9. A method for cooling a ship's engine, utilizing the ship's engine cooling device according to any one of claims 1-8, characterized in that, The method includes: Set the set temperature threshold for the cylinder block of the ship's engine; The temperature of the cylinder is detected by a temperature sensor; When the temperature sensor reading is lower than the lower limit of the set temperature threshold, the variable frequency circulating pump is controlled to run at the first speed. When the temperature sensor detects a value within the set temperature threshold range, the variable frequency circulating pump is controlled to linearly adjust the temperature according to the sensor's detection results. When the temperature sensor reading exceeds the upper limit of the set temperature threshold, the variable frequency circulating pump is controlled to run at the second speed.

10. The ship engine cooling method according to claim 9, characterized in that, When the temperature sensor reading is below 60℃, the variable frequency circulating pump is controlled to operate at a speed of 500-1500 r / min; when the temperature sensor reading is between 60℃ and 80℃, the variable frequency circulating pump is controlled according to a speed adjustment coefficient of 0.8-1.2 r / (min). The temperature is linearly regulated (℃); when the temperature sensor reading is greater than 80℃, the variable frequency circulating pump is controlled to run at a speed of 2500-3000 r / min.

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