CN112339967B - Ship outboard cooling system - Google Patents
Ship outboard cooling system Download PDFInfo
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- CN112339967B CN112339967B CN202011177143.1A CN202011177143A CN112339967B CN 112339967 B CN112339967 B CN 112339967B CN 202011177143 A CN202011177143 A CN 202011177143A CN 112339967 B CN112339967 B CN 112339967B
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- seawater
- heat exchange
- outlet
- nozzle
- cooling system
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- 238000001816 cooling Methods 0.000 title claims abstract description 68
- 239000013535 sea water Substances 0.000 claims abstract description 114
- 239000007921 spray Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to the technical field of marine equipment, and provides a ship outboard cooling system, which comprises: the system comprises an in-cabin power equipment cooling pipeline, an external heat exchange device and a seawater flow adjusting device; the external heat exchange device comprises a first end socket, a second end socket, a heat exchange tube and an outer cover, a cooling cavity is formed between the outer cover and the ship body, the heat exchange tube is located in the cooling cavity, the cooling cavity and the heat exchange tube are vertically arranged, and the seawater flow adjusting device utilizes medium-pressure air to adjust the flow velocity of seawater. The ship outboard cooling system can cool down power equipment in the cabin, realizes forced convection heat exchange between an external heat exchange device and seawater, improves heat exchange efficiency, and can adjust heat exchange capacity.
Description
Technical Field
The invention relates to the technical field of marine equipment, in particular to a ship outboard cooling system.
Background
The current ship outboard cooler is generally arranged at a sea bottom door, outboard seawater enters a cooler box through a bottom grid, and rises to a cooler box high grid to escape due to density reduction after being heated by heat exchange with a hot medium in the outboard cooler. The existing outboard cooler and seawater exchange heat in a natural convection mode and low in heat exchange efficiency, and only one grid is arranged between the seawater and the outboard cooler, so that the outboard cooler is easily blocked by pollutants, the heat exchange capacity of the outboard cooler is reduced, and the overheating accident of cooled equipment in a cabin is caused.
Disclosure of Invention
The embodiment of the invention provides a ship outboard cooling system, which is used for solving the problems of low heat exchange efficiency and easy blockage caused by natural convection of an outboard cooler in the prior art.
An embodiment of the present invention provides a ship outboard cooling system, including: the system comprises an in-cabin power equipment cooling pipeline, an external heat exchange device and a seawater flow adjusting device; the power equipment cooling pipeline in the cabin is used for cooling the power equipment in the cabin; the external heat exchange device is arranged between the ship body and the outer ship plate and comprises a first end socket, a second end socket, a heat exchange pipe and an outer cover, a cooling cavity is formed between the outer cover and the ship body, the heat exchange pipe is located in the cooling cavity, the cooling cavity and the heat exchange pipe are vertically arranged, one end of the heat exchange pipe is communicated with a water outlet end of a power equipment cooling pipeline in the cabin, the other end of the heat exchange pipe is communicated with a water inlet end of the power equipment cooling pipeline in the cabin, the first end socket and the second end socket are respectively communicated with the cooling cavity, a seawater exchange inlet is formed in the first end socket, and a seawater exchange outlet is formed in the second end socket; the outer ship plate is provided with a seawater inlet communicated to the seawater exchange inlet and a seawater outlet communicated to the seawater exchange outlet; the seawater flow adjusting device is positioned at the position of the seawater exchange outlet, is connected with an in-cabin medium-pressure air system and sprays medium-pressure air towards the seawater outlet.
The ship outboard cooling system is characterized in that at least one first guide plate and at least one second guide plate are arranged in the cooling cavity, the first guide plate and the second guide plate are perpendicular to the heat exchange tubes, the first guide plate is fixedly connected with the ship body and forms a gap with the outer cover, the second guide plate is fixedly connected with the outer cover and forms a gap with the ship body, and the first guide plate and the second guide plate are alternately arranged in the vertical direction.
The ship outboard cooling system according to an embodiment of the invention is characterized in that an opening position of the seawater exchange inlet is provided with a first grating, and the first grating forms an inclination angle towards the seawater inlet; and/or the opening position of the seawater exchange outlet is provided with a second grating, and the second grating forms an inclination angle towards the seawater outlet.
According to one embodiment of the invention, the ship outboard cooling system is characterized in that a water inlet flow guide plate is arranged between the outer cover and the outer ship plate, and the water inlet flow guide plate is positioned between the seawater exchange inlet and the seawater exchange outlet and close to one side of the seawater exchange inlet.
According to one embodiment of the invention, the ship outboard cooling system is characterized in that the seawater flow adjusting device comprises a spray head and a drainage pipe, one end of the spray head is connected with the in-cabin medium-pressure air system, the other end of the spray head is inserted into the drainage pipe, a drainage gap is formed between one end of the drainage pipe close to the spray head and the spray head, and one end of the drainage pipe, which is far away from the spray head, faces the seawater outlet.
According to one embodiment of the invention, the ship outboard cooling system is characterized in that one end of the draft tube, which is close to the spray head, is provided with a flaring, and the spray head is inserted into the flaring.
According to one embodiment of the invention, the ship outboard cooling system is characterized in that one end of the spray head, which is close to the drainage pipe, is provided with a conical necking, and the necking is provided with an extension pipe.
According to one embodiment of the invention, the ship outboard cooling system is characterized in that a diffusion opening is formed in one end, away from the spray head, of the drainage pipe, and the caliber of the diffusion opening is gradually increased from one end, close to the spray head, to one end, away from the spray head.
The ship outboard cooling system according to an embodiment of the invention is characterized in that the seawater outlet position is provided with a protective grating.
According to an embodiment of the invention, the cooling chamber and the heat exchange tubes are curved and extend along the side wall of the hull.
According to the ship outboard cooling system provided by the embodiment of the invention, the external heat exchange device is arranged in the gap between the ship body and the outer ship plate, and external heat exchange is carried out to the cooling pipeline connected with the power equipment in the cabin, so that the power equipment in the cabin is cooled. The heat exchange cavity and the heat exchange tube are vertically arranged, and natural convection can be generated during heat exchange. The seawater flow adjusting device is connected with the medium-pressure air in the cabin, the medium-pressure air is ejected by the seawater flow adjusting device, the position of a seawater outlet can be prevented from being blocked by pollutants, the medium-pressure air flow rate is high, negative pressure is generated, the seawater around the airflow can flow out of the seawater outlet quickly along the airflow flowing direction, forced convection heat exchange of an external heat exchange device and the seawater is realized, and the heat exchange efficiency is improved. In addition, the suction speed of the seawater and the heat exchange coefficient closely related to the suction speed can be conveniently adjusted by adjusting the air pressure sprayed by the seawater flow adjusting device, and the effect of adjusting the heat exchange capacity according to the working condition is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an overall structure of an outboard cooling system of a ship according to an embodiment of the present invention (arrows in fig. 1 indicate a flow direction of seawater);
fig. 2 is a schematic structural diagram of a seawater flow regulating device in an outboard cooling system of a ship according to an embodiment of the present invention (arrows in fig. 2 indicate a medium-pressure air flow direction and a seawater flow direction);
FIG. 3 is a schematic structural diagram of a first grid in an outboard cooling system for a ship according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of a second grid in the ship outboard cooling system according to the embodiment of the invention.
Reference numerals:
100. a power equipment cooling pipeline in the cabin; 200. an external heat exchange device; 210. a first end enclosure; 220. a second end enclosure; 230. a housing; 231. a seawater exchange inlet; 232. a seawater exchange outlet; 233. a first grid; 234. a second grid; 240. a heat exchange tube; 250. a first baffle; 260. a second baffle; 300. a seawater flow regulating device; 310. a spray head; 311. necking; 312. an extension pipe; 320. a drainage tube; 321. flaring; 322. a diffusion port; 330. a drainage gap; 400. a heat exchange chamber; 500. a hull; 600. an outer hull plate; 610. a water inlet drainage plate; 620. a protective grid; 700. a medium pressure air system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A ship outboard cooling system of an embodiment of the present invention is described below with reference to fig. 1 to 2.
The ship outboard cooling system includes: an in-cabin power plant cooling circuit 100, an external heat exchange device 200, and a seawater flow regulating device 300. The cabin power equipment cooling pipeline 100 is used for cooling power equipment in a cabin, wherein the power equipment in the cabin can comprise a diesel engine, a steam turbine and the like, and circulating water of the power equipment in the cabin circulates through the cabin power equipment cooling pipeline 100 to realize heat exchange and cooling.
The external heat exchange device 200 is disposed between the hull 500 and the outer hull plate 600, and the external heat exchange device 200 includes a first header 210, a second header 220, a heat exchange tube 240, and a cover 230. The first seal head 210 and the second seal head 220 may be of a water tank structure, the first seal head 210 is located on the upper side of the second seal head 220, and the first seal head 210 and the second seal head are vertically arranged along the side wall of the ship body 500 at intervals.
A heat exchange cavity 400 is formed between the outer cover 230 and the ship body 500, the heat exchange tubes 240 are positioned in the heat exchange cavity 400, and the heat exchange cavity 400 and the heat exchange tubes 240 are vertically arranged. One end of the heat exchange pipe 240 is communicated with the water outlet end of the power equipment cooling pipeline 100 in the cabin, and the other end is communicated with the water inlet end of the power equipment cooling pipeline 100 in the cabin. The heat exchange tubes 240 are provided in plurality, and each heat exchange tube 240 can exchange heat simultaneously, so that the heat exchange efficiency is improved.
The first head 210 and the second head 220 are respectively communicated with the heat exchange cavity 400. The first sealing head 210 is provided with a seawater exchange inlet 231, and the second sealing head 220 is provided with a seawater exchange outlet 232.
The outer hull plate 600 is provided with a seawater inlet connected to the seawater exchange inlet 231 and a seawater outlet connected to the seawater exchange outlet 232. Seawater can enter the interlayer between the ship body 500 and the outer ship plate 600 through the seawater inlet, enter the second end socket 220 through the seawater exchange inlet 231, and flow into the heat exchange cavity 400 through the second end socket 220, and at the moment, the seawater wraps the heat exchange tube 240 to exchange heat with the heat exchange tube 240; the seawater after heat exchange flows through the first head 210, the seawater exchange outlet 232 and the seawater outlet in sequence and is discharged.
Referring to fig. 3, the opening of the seawater exchange inlet 231 is provided with a first grating 233, and the first grating 233 can prevent the contaminants from entering the heat exchange chamber 400, so as to protect the heat exchange chamber; the first grill 233 forms an inclination toward the seawater inlet so that the seawater can be more smoothly introduced into the heat exchange chamber 400.
Referring to fig. 4, the seawater exchange outlet 232 is provided with a second grating 234, the second grating 234 forms an inclination angle towards the seawater outlet, and the second grating 234 can also prevent the contaminants from entering the heat exchange chamber 400, and more importantly, can play a role in guiding the flow.
Referring back to fig. 1 and 2, in one embodiment of the present invention, at least one first baffle 250 and at least one second baffle 260 are disposed within the heat exchange chamber 400, the first baffle 250 and the second baffle 260 being perpendicular to the heat exchange tubes 240. The first baffle 250 is fixedly connected with the hull 500 and forms a space with the outer cover 230, the second baffle 260 is fixedly connected with the outer cover 230 and forms a space with the hull 500, and seawater can pass through the space between the first baffle 250 and the outer cover 230 and the space between the second baffle 260 and the hull 500. The first guide plates 250 and the second guide plates 260 are arranged vertically alternately, and when passing through the heat exchange cavity 400, seawater is influenced by the first guide plates 250 and the second guide plates 260 and flows in the direction of a broken line in the heat exchange cavity 400, so that all parts in the heat exchange cavity 400 can achieve good heat exchange.
Optionally, a water intake flow guiding plate 610 is disposed between the outer cover 230 and the outer ship plate 600, and the water intake flow guiding plate 610 is located between the seawater exchange inlet 231 and the seawater exchange outlet 232 and is close to one side of the seawater exchange inlet 231. The water inlet flow guide plate 610 can prevent the seawater entering from the seawater inlet from being directly discharged from the seawater outlet without heat exchange of the heat exchange chamber 400. The water inlet flow guide plate 610 plays a guiding role in the seawater, and the heat exchange effect is ensured.
Further optionally, a protection grating 620 is arranged at the position of the seawater outlet, and the protection grating 620 can prevent pollutants from entering a gap between the outer ship plate 600 and the ship body 500, and can guide seawater to enable the seawater to be smoothly discharged to the sea.
In one embodiment of the present invention, the heat exchange chamber 400 and the heat exchange tubes 240 are curved and extend along the side wall of the hull 500. The gap between the hull 500 and the outer plating 600 is an arc-shaped structure extending along the sidewall of the hull 500, depending on the shape of the hull 500 and the outer plating 600. The heat exchange chamber 400 and the heat exchange tubes 240 are arranged in an arc shape and extend along the side wall of the hull 500, so that the heat exchange tubes 240 have a larger installation length and the heat exchange effect is improved.
The seawater flow regulating device 300 is located at the seawater exchange outlet 232, and the seawater flow regulating device 300 is connected to the in-cabin intermediate-pressure air system 700 and injects intermediate-pressure air toward the seawater outlet. The middle pressure air provided by the seawater flow adjusting device 300 can impact the seawater outlet in the process of spraying the seawater outlet by the seawater flow adjusting device 300, so that the seawater outlet is prevented from being polluted and blocked, the seawater discharging speed is increased, and the heat exchange is further enhanced.
In one embodiment of the present invention, the seawater flow adjusting device 300 comprises a nozzle 310 and a draft tube 320, wherein one end of the nozzle 310 is connected to the cabin medium pressure air system 700, and the other end is inserted into the draft tube 320. The draft tube 320 is coaxial with the nozzle 310, and the diameter of the draft tube 320 at the end close to the nozzle 310 is larger than the diameter of the nozzle 310 at the end close to the draft tube 320, so that a draft gap 330 is formed between the end of the draft tube 320 close to the nozzle 310 and the nozzle 310, and the end of the draft tube 320 away from the nozzle 310 faces the seawater outlet. The medium pressure air sprayed from the nozzle 310 enters the draft tube 320 and then continues flowing along the draft tube 320, the air flowing speed in the draft tube 320 is higher than the flowing speed of the external seawater, the pressure is lower, the seawater enters the draft tube 320 from the draft gap 330, and is sprayed out from the seawater outlet along with the air, thereby increasing the mobility of the seawater and improving the heat exchange efficiency.
Further, a flared opening 321 is formed at one end of the draft tube 320 near the nozzle 310, and the nozzle 310 is inserted into the flared opening 321. The arrangement of the flaring 321 facilitates the connection between the draft tube 320 and the nozzle 310, and the seawater can enter the draft tube 320 more smoothly.
Furthermore, a tapered necking 311 is arranged at one end of the nozzle 310 close to the drainage tube 320, an extension tube 312 is arranged on the necking 311, the necking 311 enables the medium-pressure air sprayed from the nozzle 310 to flow faster, and the extension tube 312 enables the air sprayed from the nozzle 310 to be more concentrated in direction, thereby facilitating the longer spraying distance.
Optionally, a diffusion port 322 is disposed at an end of the drainage tube 320 facing away from the nozzle 310, and an aperture of the diffusion port 322 gradually increases from an end close to the nozzle 310 to an end facing away from the nozzle 310. After reaching the diffusion port 322 through the draft tube 320, the medium pressure air and the carried seawater can be diffused outwards in a certain range, so that the disturbance range of the seawater is enlarged, and the heat exchange efficiency is further improved.
The ship outboard cooling system in the embodiment of the invention can utilize seawater to exchange heat, and can accelerate the flow of the seawater through the seawater flow adjusting device 300 in the heat exchange process, so that the heat exchange efficiency is improved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A marine outboard cooling system, comprising: the system comprises an in-cabin power equipment cooling pipeline, an external heat exchange device and a seawater flow adjusting device; the power equipment cooling pipeline in the cabin is used for cooling the power equipment in the cabin; the external heat exchange device is arranged between the ship body and the outer ship plate and comprises a first end socket, a second end socket, a heat exchange pipe and an outer cover, a cooling cavity is formed between the outer cover and the ship body, the heat exchange pipe is located in the cooling cavity, the cooling cavity and the heat exchange pipe are vertically arranged, one end of the heat exchange pipe is communicated with a water outlet end of a power equipment cooling pipeline in the cabin, the other end of the heat exchange pipe is communicated with a water inlet end of the power equipment cooling pipeline in the cabin, the first end socket and the second end socket are respectively communicated with the cooling cavity, a seawater exchange inlet is formed in the first end socket, and a seawater exchange outlet is formed in the second end socket; the outer ship plate is provided with a seawater inlet communicated to the seawater exchange inlet and a seawater outlet communicated to the seawater exchange outlet; the seawater flow adjusting device is positioned at the position of the seawater exchange outlet, is connected with an in-cabin medium-pressure air system and sprays medium-pressure air towards the seawater outlet.
2. The marine outboard cooling system of claim 1, wherein at least one first baffle and at least one second baffle are disposed within said cooling chamber, said first and second baffles being perpendicular to said heat exchange tubes, said first baffle being fixedly attached to said hull and spaced from said housing, said second baffle being fixedly attached to said housing and spaced from said hull, said first and second baffles being vertically alternating.
3. The marine outboard cooling system of claim 1, wherein an opening position of the seawater exchange inlet is provided with a first grating forming an inclination toward the seawater inlet; and/or the opening position of the seawater exchange outlet is provided with a second grating, and the second grating forms an inclination angle towards the seawater outlet.
4. The marine outboard cooling system of claim 1, wherein a water intake flow diverter plate is disposed between said outer cover and said outboard plate, said water intake flow diverter plate being disposed between said sea water exchange inlet and said sea water exchange outlet on a side thereof adjacent to said sea water exchange inlet.
5. The marine outboard cooling system of claim 1, wherein said seawater flow adjusting device includes a nozzle and a draft tube, one end of said nozzle is connected to said under-cabin medium pressure air system, the other end of said nozzle is inserted into said draft tube, a draft gap is formed between one end of said draft tube close to said nozzle and said nozzle, and one end of said draft tube away from said nozzle faces said seawater outlet.
6. The marine outboard cooling system of claim 5, wherein said draft tube is provided with a flare adjacent an end of said spray head, said spray head being inserted into said flare.
7. The marine outboard cooling system of claim 5, wherein said nozzle is provided with a tapered throat adjacent an end of said draft tube, said throat having an extension tube disposed thereon.
8. The outboard cooling system for the marine vessel of any one of claims 5 to 7, wherein a diffuser is provided at an end of the draft tube facing away from the nozzle, and the diffuser has an aperture that gradually increases from an end near the nozzle to an end facing away from the nozzle.
9. The marine outboard cooling system of claim 1, wherein said sea water outlet location is provided with a protective grating.
10. The marine outboard cooling system of claim 1, wherein said cooling chamber and said heat exchange tube are arcuate and extend along a side wall of said hull.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011177143.1A CN112339967B (en) | 2020-10-28 | 2020-10-28 | Ship outboard cooling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011177143.1A CN112339967B (en) | 2020-10-28 | 2020-10-28 | Ship outboard cooling system |
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| Publication Number | Publication Date |
|---|---|
| CN112339967A CN112339967A (en) | 2021-02-09 |
| CN112339967B true CN112339967B (en) | 2022-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011177143.1A Active CN112339967B (en) | 2020-10-28 | 2020-10-28 | Ship outboard cooling system |
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| Country | Link |
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| CN (1) | CN112339967B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115743495A (en) * | 2022-11-14 | 2023-03-07 | 中国船舶重工集团公司第七一九研究所 | Gravity flow conformal cooler and cooling system |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4040476A (en) * | 1975-07-09 | 1977-08-09 | The Johnson Rubber Company | Keel cooler with spiral fluted tubes |
| US4809632A (en) * | 1987-12-17 | 1989-03-07 | Hamel Jay P | Bottom scoop for engine cooling water |
| CN1022643C (en) * | 1991-01-26 | 1993-11-03 | 大连理工大学 | Vertical drop-shaped condensing steam-water tubular heat exchanger |
| FI120219B (en) * | 2007-06-29 | 2009-07-31 | Abb Oy | Heat Sink |
| CN108206064B (en) * | 2017-12-12 | 2019-11-12 | 中国船舶重工集团公司第七一九研究所 | A kind of passive heat-exchange system of steam jet driving |
| CN109000413A (en) * | 2018-07-26 | 2018-12-14 | 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 passive outboard cooling system suitable for underwater platform |
| CN109795662B (en) * | 2019-03-05 | 2024-01-19 | 上海船舶研究设计院（中国船舶工业集团公司第六0四研究院） | Water cooling system of ship, adjusting method of water cooling system and ship |
| CN210503143U (en) * | 2019-10-11 | 2020-05-12 | 宁波捷茂船舶技术有限公司 | Shell type cooling device for ship turbine |
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