CN110539869B - Self-flow cooling system and control method thereof - Google Patents
Self-flow cooling system and control method thereof Download PDFInfo
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- CN110539869B CN110539869B CN201910911689.6A CN201910911689A CN110539869B CN 110539869 B CN110539869 B CN 110539869B CN 201910911689 A CN201910911689 A CN 201910911689A CN 110539869 B CN110539869 B CN 110539869B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
- B63H21/383—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like for handling cooling-water
Abstract
The invention relates to the technical field of ship cooling systems and discloses a self-flow cooling system and a control method thereof. According to the self-flow cooling system provided by the invention, the height of the self-flow generator extending out of the bottom shell of the ship body is adjustable, the extending height of the self-flow generator can be controlled and regulated in real time according to the actual demand of the flow of cooling seawater, the active adjustment and matching supply of the self-flow cooling seawater is realized, the problems of vibration of an adjusting device and large system noise in a passive throttling mode are solved, and meanwhile, the dragging resistance of the self-flow generator to the ship body can be effectively reduced in a state that the self-flow generator does not extend out completely.
Description
Technical Field
The invention relates to the technical field of ship cooling systems, in particular to a self-flow cooling system and a control method thereof.
Background
The cooling system is an important component of the ship power system and is an important link that must be focused on further improving the performance of the ship. In order to reduce the problems of scaling and corrosion, the current advanced ships all adopt a central cooling water system, and the working principle of the central cooling water system is that sea water is conveyed by a sea water pump to enter the central cooling system to cool low-temperature fresh water, and the cooled low-temperature fresh water is used for cooling high-temperature fresh water of a cylinder sleeve and a cylinder cover of a main diesel engine of the ship, various parts needing cooling such as various coolers, a cylinder sleeve of a power generation diesel engine and the like.
In the existing ship central cooling system, a seawater pump is required to maintain the circulating flow of cooling seawater, and a great amount of energy consumption is generated by continuous operation of the seawater pump. In order to reduce pumping loss and improve energy efficiency, a self-flow cooling technology is gradually derived, and a self-flow generator is arranged at the sea water inlet position of an outboard sea-going system, so that no-pump driving of cooling water is realized by means of the upstream dynamic pressure during ship navigation. The self-flow generator for driving cooling water is fixedly arranged on the surface of a ship body, the system cooling water supply capacity is determined by the navigational speed of the ship, the cooling water quantity is regulated in a 'passive loss' mode through a valve or an adaptive regulating device arranged on a pipeline, namely, flow resistance is arranged in the pipeline to realize flow supply and demand balance under the condition of excessive diversion flow of the self-flow generator, the system cooling water supply capacity is actually a waste of the water supply capacity of the self-flow generator, the regulating device is caused to vibrate, and additional vibration noise is generated in a pipeline system. In addition, the gravity flow generator fixedly mounted on the surface of the ship body also provides additional resistance to sailing.
Disclosure of Invention
The embodiment of the invention provides a self-flow cooling system and a control method thereof, which are used for solving or partially solving the problems of high system noise, high hull body attachment resistance and the like caused by the fact that the flow of the existing ship self-flow cooling device is regulated in a passive throttling mode.
In a first aspect, an embodiment of the present invention provides a self-flow cooling system, including a self-flow generator liftably mounted on a hull bottom shell, and a water inlet flow channel disposed in the self-flow generator, wherein a lower end portion of the self-flow generator may extend out of the hull bottom shell, a front side of a lower end portion of the self-flow generator is a flow-facing surface, and a water inlet of the water inlet flow channel is disposed on the flow-facing surface.
On the other hand, the embodiment of the invention also provides a control method of the self-flow cooling system, which comprises the steps that the self-flow generator descends and extends out of the bottom shell of the ship body by a preset height so that seawater enters the water inlet flow channel;
acquiring the seawater flow Q entering the self-flow cooling system 1 ；
According to the seawater flow Q of the self-flow cooling system 1 With preset system seawater flow Q 0 And (3) controlling the lifting of the gravity flow generator.
According to the self-flow cooling system and the control method thereof provided by the embodiment of the invention, the self-flow generator can be installed on the bottom shell of the ship body in a lifting manner, the height of the self-flow generator extending out of the bottom shell of the ship body is adjustable, and the water inlet of the water inlet flow channel of the system is arranged on the flow facing surface of the lower end part of the self-flow generator. The height of the gravity flow generator extending out of the bottom shell of the ship body is adjusted, so that the effective opening area of the water inlet flow channel can be adjusted, the water inlet of the water inlet flow channel has different heights relative to the ship shell and is positioned at different boundary layer positions, and different water inlet pressure heads are provided, so that different seawater flows are provided. Therefore, according to the scheme of the self-flow cooling system with the adjustable extending height of the self-flow generator, the extending height of the self-flow generator can be controlled and adjusted in real time according to the actual demand of the flow of cooling seawater, active adjustment and matching supply of the self-flow cooling seawater are realized, the problems of vibration of an adjusting device and large system noise in a passive throttling mode are solved, and meanwhile, the dragging resistance of the self-flow generator to a ship body can be effectively reduced in a state that the self-flow generator does not extend completely.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a self-flowing cooling system according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of a gravity flow generator mounting arrangement provided by an embodiment of the present invention;
FIG. 3 is a bottom view of a gravity flow generator according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a rack and pinion mechanically driven gravity flow generator according to another embodiment of the present invention;
FIG. 5 is a schematic view of a linear motor electromagnetic driven gravity flow generator according to another embodiment of the present invention;
FIG. 6 is a schematic diagram of a hydraulic self-flow generator according to another embodiment of the present invention;
FIG. 7 is a flow chart of a control principle of a control method of a self-flowing cooling system according to an embodiment of the present invention;
in the figure: 1. a gravity flow generator; 2. a water inlet flow passage; 3. sea valve box; 4. a lifting opening; 5. a cooler; 6. a self-flow opening and closing valve; 7. a cooling water pump; 8. a pump flow opening and closing valve; 9. an inlet port side valve; 10. a filter; 11. an outlet port side valve.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.
Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality", "a plurality of groups" is two or more.
As shown in fig. 1-6, the embodiment of the invention provides a self-flow cooling system, which comprises a self-flow generator 1 and a water inlet runner 2, wherein the self-flow generator 1 is installed on a bottom shell of a ship body in a lifting manner, the water inlet runner 2 is arranged in the self-flow generator 1, the lower end part of the self-flow generator 1 can extend out of the bottom shell of the ship body, the front side of the lower end part of the self-flow generator 1 is a flow-facing surface, and a water inlet of the water inlet runner 2 is formed in the flow-facing surface.
The existing self-flow generators 1 for driving the cooling system to cool the seawater are fixedly arranged on the surface of the hull shell, the supply capacity of the system to cool the seawater is determined by the navigational speed, and the cooling water quantity is regulated by a valve or a self-adaptive regulating device arranged on a pipeline. The flow rate of the cooling seawater entering the cooling system is regulated by a valve or an adaptive regulating device arranged on the pipeline, and the regulating method belongs to 'passive loss regulation', namely, flow resistance is arranged in the pipeline to realize flow supply and demand balance under the condition of excessive water diversion flow rate of the self-flow generator 1, which is a waste of water supply capacity of the self-flow generator 1, and can cause vibration of the regulating device and generate additional vibration noise in the pipeline system. At the same time, the gravity flow generator 1 fixedly mounted on the hull surface will also form a continuous drag resistance as a marine appendage.
According to the self-flow cooling system provided by the invention, the self-flow generator 1 is installed on the bottom shell of the ship body in a lifting manner, the height of the self-flow generator 1 extending out of the bottom shell of the ship body is adjustable, and the water inlet of the water inlet flow channel 2 of the system is arranged on the flow facing surface of the lower end part of the self-flow generator 1. By adjusting the height of the gravity flow generator 1 extending out of the bottom shell of the ship, the effective opening area of the water inlet flow channel 2 can be adjusted, and the water inlet of the water inlet flow channel 2 has different heights relative to the ship shell and is positioned at different boundary layer positions, and has different water inlet pressure heads, so that the water flow rate is different. Therefore, according to the scheme of the self-flow cooling system with the adjustable extending height of the self-flow generator 1, the extending height of the self-flow generator 1 can be controlled and adjusted in real time according to the actual demand of the flow of cooling seawater, active adjustment and matching supply of the self-flow cooling seawater are realized, the problems of vibration of an adjusting device and large system noise in a passive throttling mode are solved, and meanwhile, the dragging resistance of the self-flow generator 1 to a ship body can be effectively reduced in a state that the self-flow generator 1 does not extend completely.
In order to weaken the turbulent flow of the attached body, the outer contour of the gravity flow generator 1 with adjustable extending height can be a streamline stretching body, for example, the cross section of the gravity flow generator 1 perpendicular to the lifting direction of the gravity flow generator 1 can be in a water drop shape with wide front and narrow rear, the flow facing surface of the water drop shape cross section is a rounded corner, and the back flow surface is an airfoil. A sea chest 3 may be provided on the inside of the hull bottom for receiving the gravity flow generator 1. When the gravity flow generator 1 does not work, the gravity flow generator can be completely accommodated in the sea chest 3 at the inner side of the bottom shell of the ship body, so that the drag resistance of an attached body is reduced to the maximum extent; when the gravity flow generator 1 works, only the outer protruding part forms a ship appendage, so that the drag resistance of the gravity flow generator 1 to the ship body is effectively reduced. In addition, a lifting opening 4 can be arranged on one side of the sea valve box 3 facing the sea water, and the opening contour of the lifting opening 4 is matched with the outer contour of the gravity flow generator 1; the side plate of the sea valve box 3 facing to the sea water and the bottom shell of the ship body can be overlapped, and the lifting opening 4 is arranged on the bottom shell of the ship body when seen from the outside; the opening contour of the lifting opening 4 is matched with the outer contour of the gravity flow generator 1, so that the influence of the lifting opening 4 on the bottom shell structure of the ship body can be reduced as much as possible, and the telescopic lifting requirement of the gravity flow generator 1 is met.
The self-flow cooling system provided by the embodiment of the invention can further comprise a cooler 5, wherein a water inlet of the cooler 5 is connected with a water outlet pipeline of the water inlet flow channel 2. Further, the pipeline between the water inlet of the cooler 5 and the water outlet of the water inlet flow channel 2 can comprise a self-flowing bypass and a pump-flowing bypass which are arranged in parallel. The gravity bypass is provided with a gravity start-stop valve 6 for controlling the opening and closing of the gravity bypass; the pump flow bypass is provided with a cooling water pump 7 and a pump flow on-off valve 8 which are connected in series, the pump flow on-off valve 8 is used for controlling the opening and closing of the pump flow bypass, and the cooling water pump 7 can generate pump flow water pressure. As shown in fig. 1, the system may further comprise an inlet port side valve 9, a filter 10, an outlet port side valve 11 and an outlet port. The system is in operation with the inlet and outlet side valves 9, 11 in an open condition. Under the condition that the water supply capacity of the self-flow generator 1 with adjustable extension height can meet the requirement of the cooler 5 on the flow of cooling seawater, the system is in a pure self-flow cooling working condition, at the moment, the self-flow on-off valve 6 of the self-flow bypass is opened, the pump flow on-off valve 8 of the pump flow bypass is closed, the cooling seawater sequentially flows through the inlet side valve 9, the filter 10 and the self-flow on-off valve 6 under the dynamic pressure conversion effect of the self-flow generator 1 with adjustable extension height, enters the cooler 5, and the seawater with the cooling function flows through the outlet side valve 11 and is discharged through the water outlet port of the system. Under the condition that the water supply capacity of the self-flow generator 1 with adjustable extension height cannot meet the flow requirement of the cooler 5 on cooling seawater, the system is in a self-flow pump flow mixed cooling working condition, at the moment, the self-flow on-off valve 6 of the self-flow bypass and the pump flow bypass on-off valve are all opened, the cooling seawater sequentially flows through the inlet side valve 9 and the filter 10 under the dynamic pressure conversion effect of the self-flow generator 1 with adjustable extension height and is divided into two paths, one path flows through the self-flow bypass, the other path flows through the cooling water pump 7 and the pump flow on-off valve 8, the two paths of cooling seawater are converged and then enter the cooler 5, and the seawater with the cooling function is discharged through the outlet side valve 11 of the system.
According to the self-flow cooling system provided by the embodiment of the invention, the self-flow generator 1 can be lifted by adopting a gear-rack mechanical transmission drive, for example, the self-flow generator 1 is driven by the gear-rack mechanical transmission as shown in fig. 4, a rotary gear is arranged in the sea valve box 3, a rack is arranged on the side wall of the self-flow generator 1, and the self-flow generator 1 is lifted by the rotary gear driven by the mechanical transmission of the gear-rack; the self-flow generator 1 can also be electromagnetically driven by a linear motor, for example, as shown in fig. 5, a stator part of the linear motor is arranged in the sea chest 3, a rotor part of the linear motor is connected with the self-flow generator 1, and the self-flow generator 1 is electromagnetically driven by the linear motor to lift; the hydraulic motor can be used for hydraulic driving, for example, as shown in fig. 6, the gravity flow generator 1 is driven by hydraulic pressure, a hydraulic cylinder is arranged in the sea chest 3, a hydraulic piston is connected with the gravity flow generator 1, and the gravity flow generator 1 is lifted by hydraulic driving.
The embodiment of the invention also provides a control method of the self-flow cooling system, which comprises the following steps:
the gravity flow generator 1 descends and extends out of the bottom shell of the ship body by a preset height so that seawater enters the water inlet channel 2, wherein the preset height can be one third to two thirds of the maximum descending height of the gravity flow generator 1, for example, the preset height can be half of the maximum descending height of the gravity flow generator 1;
acquiring seawater flow Q entering self-flow cooling system 1 ；
According to the sea water flow Q of the self-flowing cooling system 1 With preset system seawater flow Q 0 And controls the elevation of the gravity flow generator 1.
According to the theory related to hydrodynamics, when the ship sails, boundary layers with different speeds can be generated in the water flow of the ship shell, in the boundary layers, the water flow far away from the ship shell is less influenced by the ship sailing, has a larger relative speed with the ship, and the water flow close to the ship shell is more influenced by the ship sailing, and has a smaller relative speed with the ship. The lifting of the gravity flow generator 1 not only can adjust the effective opening area of the water inlet flow channel 2, but also can enable the water inlet of the water inlet flow channel 2 to have different heights relative to the ship hull, so that the water inlet flow channel is positioned at different boundary layer positions, has different water inlet pressure heads and further has different seawater flow rates. Generally, the gravity flow generator 1 descends, so that the water inlet of the water inlet flow channel 2 can completely extend out of the ship shell, the effective opening area is increased, the water inlet of the water inlet flow channel 2 is far away from the ship shell, the seawater has a larger relative speed relative to the ship body, and accordingly a larger water inlet pressure head is provided, and the water inlet flow is effectively improved.
The self-flow cooling system is characterized in that the self-flow cooling system comprises a self-flow generator 1, a self-flow cooling system, a control system and a control system, wherein the self-flow cooling system comprises a self-flow generator 1, a control system and a control system, wherein the control system is used for controlling the self-flow generator 1 to be automatically controlled by the control system, the control system is used for controlling the self-flow cooling system to be automatically controlled by the control system.
Further, according to the sea water flow Q of the self-flowing cooling system 1 With preset system seawater flow Q 0 Control of the elevation of the gravity flow generator 1 may include:
if Q 1 Equal to Q 0 Maintaining the position of the gravity flow generator 1 to maintain the current seawater flow;
if Q 1 Greater than Q 0 Raising the free-flow generator 1 to reduce the height of the free-flow generator 1 extending out of the bottom hull and reduce the flow of seawater into the free-flow cooling system;
if Q 1 Less than Q 0 The gravity flow generator 1 is lowered to increase the height of the gravity flow generator 1 extending out of the bottom hull and increase the flow of seawater into the gravity flow cooling system.
Further, if Q 1 Less than Q 0 Lowering the free-flow generator 1 to increase the height of the free-flow generator 1 extending out of the bottom hull of the ship and increasing the flow of seawater into the free-flow cooling system, further comprising:
if the self-flow generator 1 reaches the maximum height extending out of the bottom shell of the ship, the pump flow start-stop valve 8 and the cooling water pump 7 are sequentially started, and the system is in the self-flow pump flow mixed cooling working condition.
FIG. 7 provides a flow chart of the control principle of the control method of the self-flowing cooling system according to another embodiment of the invention. Before the system operates, the self-flow on-off valve 6, the inlet side valve 9 and the outlet side valve 11 of the self-flow bypass are firstly opened, then the height-adjustable self-flow generator 1 is extended to an initial preset height, the cooling system enters a pure self-flow operation mode, at the moment, the control system reads the flow, temperature and other operation parameters of the cooling seawater, and compares the flow with a predefined range to judge the supply and demand conditions of the cooling seawater flow. When the contrast shows that the cooling seawater flow is insufficient, if the extension range of the self-flow generator 1 is controlled not to exceed the set travel range of the actuating mechanism, outputting a signal to the actuating mechanism, and controlling the actuating mechanism to increase the extension amount; if the extension range of the self-flow generator 1 is controlled to exceed the set travel range of the actuating mechanism, a pump flow start-stop valve 8 of a pump flow bypass is opened, a cooling water pump 7 is started, and the flow is controlled by adjusting the rotating speed of the cooling water pump 7. When the comparison shows that the flow of the cooling seawater is excessive, a signal is output to the actuating mechanism, and the actuating mechanism is controlled to reduce the extension of the gravity flow generator 1. After the system state is regulated, the operation parameters are read, compared and judged again, and feedback control is carried out until the water supply quantity meets the actual requirement.
According to the self-flow cooling system and the control method thereof provided by the embodiment of the invention, the self-flow generator 1 is arranged on the bottom shell of the ship in a lifting manner, the height of the self-flow generator 1 extending out of the bottom shell of the ship is adjustable, and the water inlet of the system water inlet runner 2 is arranged on the flow facing surface of the lower end part of the self-flow generator 1. By adjusting the height of the gravity flow generator 1 extending out of the bottom shell of the ship, the effective opening area of the water inlet flow channel 2 can be adjusted, and the water inlet of the water inlet flow channel 2 has different heights relative to the ship shell and is positioned at different boundary layer positions, and has different water inlet pressure heads, so that the water flow rate is different. Therefore, according to the scheme of the self-flow cooling system with the adjustable extending height of the self-flow generator 1, the extending height of the self-flow generator 1 can be controlled and adjusted in real time according to the actual demand of the flow of cooling seawater, active adjustment and matching supply of the self-flow cooling seawater are realized, the problems of vibration of an adjusting device and large system noise in a passive throttling mode are solved, and meanwhile, the dragging resistance of the self-flow generator 1 to a ship body can be effectively reduced in a state that the self-flow generator 1 does not extend completely. Further, in order to reduce the turbulence of the appendage, the profile of the height-adjustable gravity flow generator 1 may be a streamlined stretched body, for example, the gravity flow generator 1 may have a water drop shape with a wide front and a narrow rear in a cross section perpendicular to the lifting direction thereof; a sea chest 3 may be provided on the inside of the hull bottom for receiving the gravity flow generator 1. When the gravity flow generator 1 does not work, the gravity flow generator can be completely accommodated in the sea chest 3 at the inner side of the bottom shell of the ship body, so that the drag resistance of an attached body is reduced to the maximum extent; the connecting pipeline between the water inlet of the cooler 5 and the water outlet of the water inlet flow channel 2 can comprise a self-flow bypass and a pump flow bypass which are arranged in parallel, and the inlet flow of the cooled seawater can be further improved through the pump flow bypass, so that the requirement of larger flow is met.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. The self-flow cooling system is characterized by comprising a self-flow generator and a water inlet flow channel, wherein the self-flow generator is installed on a bottom shell of a ship body in a lifting manner, the water inlet flow channel is arranged in the self-flow generator, the lower end part of the self-flow generator can extend out of the bottom shell of the ship body, the front side of the lower end part of the self-flow generator is a flow-facing surface, and a water inlet of the water inlet flow channel is arranged on the flow-facing surface;
the water inlet of the cooler is connected with the water outlet pipeline of the water inlet flow channel;
the pipeline between the water inlet of the cooler and the water outlet of the water inlet flow channel comprises a self-flow bypass and a pump flow bypass which are connected in parallel; the self-flow bypass is provided with a self-flow start-stop valve, and the pump flow bypass is provided with a cooling water pump and a pump flow start-stop valve which are connected in series;
wherein the gravity flow generator is used for descending and extending out of the bottom shell of the ship body by a preset height and according to the seawater flow Q entering the gravity flow cooling system 1 With preset system seawater flow Q 0 And (3) controlling the lifting of the gravity flow generator.
2. The free-flowing cooling system of claim 1, wherein the cross section of the free-flowing generator perpendicular to the lifting direction of the free-flowing generator is in the shape of a water drop with a wide front and a narrow rear.
3. The self-flow cooling system of claim 1, further comprising a sea chest; the sea valve box is arranged on the inner side of the bottom shell of the ship body and is used for accommodating the self-flow generator.
4. A self-flow cooling system according to claim 3, wherein the sea chest is provided with a lifting opening on the side facing the sea water, the opening profile of the lifting opening matching the outer profile of the self-flow generator.
5. The self-flow cooling system of claim 3 wherein the lifting of the self-flow generator is driven by a rack and pinion mechanical drive, a linear motor electromagnetic drive, or a hydraulic motor hydraulic drive.
6. The method of controlling a free-flowing cooling system according to any one of claims 1-5, wherein the flow Q of seawater according to the free-flowing cooling system 1 With preset system seawater flow Q 0 Controlling the elevation of the gravity flow generator, comprising:
if Q 1 Equal to Q 0 Maintaining the position of the gravity flow generator to maintain the current seawater flow;
if Q 1 Greater than Q 0 Raising the free-flow generator to reduce the height of the free-flow generator extending out of the hull bottom shell, reducing the flow of seawater into the free-flow cooling system;
if Q 1 Less than Q 0 And the gravity flow generator is lowered to increase the height of the gravity flow generator extending out of the bottom shell of the ship body, and the flow of seawater entering the gravity flow cooling system is increased.
7. The control method according to claim 6, wherein the if Q 1 Less than Q 0 Lowering the free-flow generator to raise the free-flow generatorThe gravity flow generator stretches out the height of hull drain pan, increases the sea water flow that gets into gravity flow cooling system still includes:
if the gravity flow generator reaches the maximum height extending out of the bottom shell of the ship body, the pump flow start-stop valve and the cooling water pump are sequentially started.
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| CN111874202A (en) * | 2020-07-13 | 2020-11-03 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Energy-consuming ship self-flow cooling system |
| CN111942559B (en) * | 2020-07-22 | 2021-04-27 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Method and device for improving performance of self-flowing cooling system and control unit |
| CN111959733B (en) * | 2020-07-31 | 2022-03-22 | 武汉第二船舶设计研究所(中国船舶重工集团公司第七一九研究所) | Ship sea-going cooling system with auxiliary propulsion function and ship |
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| CN108082435A (en) * | 2017-11-28 | 2018-05-29 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | A kind of self-recycle water system based on hot buoyance lift principle |
| CN208306918U (en) * | 2018-04-20 | 2019-01-01 | 中国舰船研究设计中心 | A kind of maritime mouth of gravity flow of novel trapezoidal variable cross-section |
| CN210618439U (en) * | 2019-09-25 | 2020-05-26 | 中国船舶重工集团公司第七一九研究所 | Gravity flow cooling system |
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