CN112874698A - Self-ballasting buoy utilizing seawater and control method thereof - Google Patents
Self-ballasting buoy utilizing seawater and control method thereof Download PDFInfo
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- CN112874698A CN112874698A CN202110165592.2A CN202110165592A CN112874698A CN 112874698 A CN112874698 A CN 112874698A CN 202110165592 A CN202110165592 A CN 202110165592A CN 112874698 A CN112874698 A CN 112874698A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B22/00—Buoys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B22/00—Buoys
- B63B22/18—Buoys having means to control attitude or position, e.g. reaction surfaces or tether
- B63B22/20—Ballast means
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Abstract
The invention relates to a self-ballast buoy utilizing seawater, which comprises a buoy body and an anchoring system arranged at the bottom of the buoy body, wherein a plurality of ballast devices are arranged in the buoy body, and the buoy comprises: a ballast tank for holding seawater; the water through hole is arranged at the bottom of the ballast water tank; the aeration device is connected with the ballast water tank and used for controlling the ballast water tank to realize switching between a first state and a second state, the first state is that the air pressure in the ballast water tank is reduced, and seawater enters the ballast water tank through the limber hole so as to form and maintain ballast; the second state is that the air pressure in the ballast water tank is increased to eliminate ballast. The seawater is used as the buoy ballast, so that extra ballast is saved, the weight of the buoy is reduced, the stability of the buoy is guaranteed, the requirements of operation ships and special equipment for buoy operation and maintenance are lowered, the buoy operation safety is improved, and the buoy construction, arrangement, operation, maintenance and recovery costs are saved. The invention also discloses a control method of the buoy.
Description
Technical Field
The invention relates to the field of ocean buoys, in particular to a self-ballasting buoy utilizing seawater and a control method thereof.
Background
At present, the weight of various large and medium-sized buoys on the sea is generally overlarge, the weight of a buoy of 10 meters reaches 50-60 tons before launching, and the weight of a buoy of 6 meters reaches more than 20 tons. Taking a 10-meter buoy as an example, the buoy comprises an all-steel buoy and a combined buoy, the designed water discharge is 50-60 tons, however, steel materials required for building the buoy are only about 20 tons, in order to enable the buoy stability to meet the design requirement, the gravity center of the buoy needs to be reduced, and the buoy reaches the designed draft, an additional ballast of about 30 tons needs to be additionally added to the buoy. In the prior art, high-density materials such as cement or ballast iron are generally used as ballast, and the additional weight of the ballast is an important factor for increasing the cost of constructing, carrying and maintaining the buoy. Because the weight of the existing 10-meter buoy reaches 50-60 tons and is limited by the weight of the buoy, the requirements on ship performance and deck mechanical equipment for carrying out offshore buoy operation are higher, at present, only 2 professional buoy operation ships (1 each in the east sea and the south sea) with the capacity of carrying, hoisting and recovering large and medium buoys at sea exist in China, except for the marine buoy, other ships do not have the capacity of carrying, hoisting and recovering the large and medium buoys at sea, but the cost is higher if the marine buoy is used for carrying, hoisting and recovering the large and medium buoys at sea, and the existing 10-meter buoy hoisting and recovering needs that the ships have A-type erection hoisting equipment with the dynamic load of not less than 750KN (about 75 tons). Therefore, the heavy ballast on the large and medium-sized buoys not only causes difficulty and cost of buoys construction, operation and maintenance to be high, but also brings uncontrollable danger and problems to offshore operation of buoys such as offshore carrying, arrangement and recovery.
Disclosure of Invention
The invention aims to overcome at least one defect (deficiency) of the prior art and provides a seawater self-ballasting buoy and a control method thereof, which take seawater as buoy ballast, save additional ballast, greatly reduce the weight of the buoy, ensure the stability of the buoy, reduce the requirements on operation ships and special equipment for buoy operation and maintenance, improve the safety of buoy offshore operation and save the cost of buoy construction, operation and maintenance.
The technical scheme adopted by the invention is that,
the utility model provides an utilize sea water self-ballasting buoy, includes the buoy body and locates the anchor system of buoy body bottom, set up a plurality of ballast devices in the buoy body, it includes:
a ballast tank for holding seawater;
the water through hole is formed in the bottom of the ballast water tank; and
the ventilating device is connected with the ballast water tank and is used for controlling the ballast water tank to realize the switching between the first state and the second state,
the first state is that seawater enters the ballast water tank through the limber hole, and the air pressure in the ballast water tank is reduced to form and maintain ballast;
and in the second state, the air pressure in the ballast water tank is increased, and the seawater is discharged from the ballast water tank through the limber holes so as to eliminate ballast.
In the technical scheme, the design and construction idea that the stability of the buoy on the sea and the gravity center of the buoy are improved and reduced by additionally loading the ballast in the traditional buoy is broken through, the additional ballast on the buoy is omitted, the total overall weight of the buoy is only the weight of the material required by the buoy to be constructed before the buoy is lifted and placed into water by utilizing the seawater self-ballasting buoy, the seawater is automatically loaded after the buoy is lifted and placed into the water, the seawater enters a ballast water tank to form the ballast, the design draught, stability and gravity center requirements which are the same as those of the existing buoy can be still realized after the seawater is loaded, and when the buoy needs to be recovered, the ballast can be automatically subtracted, and finally the weight of the material of the buoy is returned; because the weight of the buoy is reduced, taking a 10-meter buoy as an example, the offshore deploying and retracting operation of the buoy can be realized only by a working ship with 30 tons of A-shaped frame hoisting equipment, the construction, operation and maintenance costs of the buoy and the requirements on the offshore working ship are greatly reduced, and the safety of the offshore operation is improved.
Preferably, the aeration device comprises:
a vent pipe, one end of which is communicated with the ballast water tank;
the ventilation valve is arranged at the other end of the ventilation pipe;
the quick connector is arranged above the vent valve; and
and the air compressor is connected with the quick connector and is used for introducing high-pressure air into the ballast water tank.
In the technical scheme, the water ballast tank arranged in the buoy body is communicated with air or high-pressure air outside the tank through the vent pipe; when the vent valve is opened, the ballast water tank is communicated with air outside the tank, seawater can enter the ballast water tank from the limber hole at the moment, so that the air pressure in the ballast water tank is slowly reduced, at the moment, ballast is formed in the ballast water tank, when the ballast water tank is filled with seawater, the seawater is limited by volume and is influenced by air pressure, the seawater stays in the ballast water tank to keep ballast, or after the seawater enters the ballast water tank from the limber hole to be loaded, the vent valve can be closed, so that air pressure difference exists between the inside and the outside of the ballast water tank, and the seawater stays to keep ballast; when the ballast needs to be eliminated, the vent valve is opened, high-pressure air is introduced into the ballast water tank by using an air compressor, and seawater in the ballast water tank is discharged from the water through holes. The aeration device has a simple structure, can easily control the ballast of the self-ballasting buoy by using the seawater, and greatly reduces the construction cost of the buoy.
Preferably, the ballast device further comprises an emergency drain pipe, one end of the emergency drain pipe is arranged in the ballast water tank compartment and is close to the bottom of the ballast water tank compartment, and the other end of the emergency drain pipe penetrates through the top of the ballast water tank compartment and extends out of the side face of the buoy body, so that the seawater filling amount can be observed, and the ballast water tank compartment is filled with seawater and the seawater is drained.
More preferably, the emergency drainage pipe is arranged at one end in the ballast water tank and the bottom of the ballast water tank, the distance between the one end and the bottom of the ballast water tank is 5-10 cm, and/or the height of the other end extending out of the side surface of the buoy body is slightly higher than the waterline of the buoy body.
In the technical scheme, in the process of forming ballast in the ballast water tank, when seawater overflows from the emergency drainage pipe, the seawater is indicated to fill the ballast water tank, and the buoy body reaches the draught depth and can be put into use; in the process of recovery, when high-pressure air is injected into the ballast water tank, one end of the emergency drain pipe close to the bottom of the ballast water tank can assist in emptying seawater in the tank, and when the emergency drain pipe does not discharge seawater, the emergency drain pipe indicates that the seawater is completely discharged, the buoy body is in an idle state, a hoisting recovery process of the buoy can be carried out, the height of the other end extending out of the side surface of the buoy body is slightly higher than the waterline of the buoy body, and therefore the situation that when the ballast water tank is full of water, the seawater can overflow from the emergency drain pipe can be guaranteed.
Preferably, the height of the ballast water tank is lower than or equal to the vertical distance from the waterline of the buoy body to the bottom of the buoy body.
More preferably, the height of the ballast water tank is equal to the vertical distance from the waterline of the buoy body to the bottom of the buoy body.
In the technical scheme, the height of the ballast water tank is lower than or equal to the height of a waterline so as to reduce the center of gravity of the buoy body and ensure the stability of the buoy.
Preferably, the number of the ballast water tanks is 4 to 6.
Preferably, the volume of the ballast water tanks is defined as V, the number of the ballast water tanks is defined as n, the draft displacement of the buoy body is designed to be m1, the weight of the buoy body is defined as m2, the weight of the mooring is defined as m3, the designed reserve buoyancy is defined as m4, and the density of the seawater is defined as p, then
In the technical scheme, the volume of the ballast water tank is designed, so that seawater in the ballast water tank can form ballast with enough weight, the design requirements on draught, stability and gravity center as those of the conventional buoy can be met by utilizing the seawater self-ballast buoy, and the safety of the buoy in the marine operation process is improved.
Preferably, the ballast device further comprises a liquid level sensor arranged in the ballast water tank and used for detecting the water level of seawater filled into the ballast water tank, and/or the vent valve is an electrically controlled vent valve which is electrically connected with the liquid level sensor and controls the electrically controlled vent valve to be closed when the liquid level sensor detects that the ballast water tank is filled with seawater.
In the technical scheme, the liquid level sensor detects the seawater level in the ballast water tank, and when the seawater is detected to fill the ballast water tank, the electronic control vent valve is automatically closed, so that the water level in the ballast water tank does not need to be observed through the emergency drain pipe, the vent valve does not need to be manually closed, the vent valve is convenient to close uniformly, and the operation flow of operators is simplified.
Preferably, a maintenance gate is provided at the bottom of the ballast tank for maintenance of the ballast tank.
The invention also provides a control method for the self-ballasting buoy by using the seawater, which comprises the following steps:
the method for controlling the self-ballast buoy to form ballast comprises the following steps:
opening the vent valve to enable the interior of the ballast water tank to be communicated with air outside the ballast water tank, arranging the self-ballast buoy on the water surface, enabling seawater to enter the ballast water tank through the limber hole to form ballast, enabling the self-ballast buoy to slowly sink, and enabling the interior of the ballast water tank to be isolated from the air outside the ballast water tank when the ballast water tank is filled with seawater, so that the seawater stays in the ballast water tank to keep the ballast water; and
the method for controlling the self-ballast buoy to eliminate ballast comprises the following steps:
the air compressor is connected with the quick connector, the vent valve is opened, high-pressure air is injected into the ballast water tank, seawater in the ballast water tank is discharged from the ballast water tank through the limber hole and the emergency drain pipe to eliminate ballast, and when the emergency drain pipe does not discharge seawater from one end extending out of the side surface of the buoy body, the ballast is completely eliminated.
More preferably, in the method for controlling the ballast forming of the self-ballasting buoy, when the ballast water tank is filled with seawater, the inside of the ballast water tank is isolated from the air outside the tank by closing the vent valve, so that the seawater stays in the ballast water tank to be kept ballasted.
Compared with the prior art, the invention has the beneficial effects that:
(1) compared with the traditional buoy, the buoy utilizing the seawater self-ballasting weight saves extra ballast with overlarge weight, greatly reduces the weight in the process of hoisting, releasing and recovering, reduces the construction, operation and maintenance cost of the buoy and the requirements on marine operation ships, improves the safety of marine operation, and is particularly suitable for the construction and transformation of large and medium buoys;
(2) according to the seawater self-ballasting buoy, by designing the ballast water tank, the same design requirements on draught, stability and gravity center as those of the existing buoy can be realized after the ballast water tank is filled with seawater, and the running safety of the buoy is ensured;
(3) the method for controlling the seawater self-ballasting buoy provided by the invention can control ballasting so as to enable the weight of the buoy to adapt to the requirements of different processes, is simple to control and is convenient for operators to operate.
Drawings
Fig. 1 is a perspective view of a self-ballasting buoy of the present invention using seawater.
Fig. 2 is a sectional view of a self-ballasting buoy using seawater according to the present invention.
In the drawings are labeled: 1. a buoy deck; 2. a float body; 3. a ballast water tank; 4. a breather pipe; 5. a vent valve; 6. an emergency drain pipe; 7. a water through hole; 8. repairing the road door; 9. a quick coupling; 10. a water line.
Detailed Description
The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 1 and 2, the present embodiment provides a seawater self-ballasted buoy, which includes a buoy body 2 and an anchor system (not shown) disposed at the bottom of the buoy body 2, a mast is disposed on the buoy deck 1, and a plurality of ballast devices are disposed in the buoy body 2, and include a ballast tank 3 for accommodating seawater, a water vent 7 disposed at the bottom of the ballast tank 3, an air vent, and an emergency drain 6. The seawater self-ballasting buoy saves extra ballast attached to the buoy, so that the total overall weight of the buoy is only the weight of materials required by the buoy before launching, the buoy is automatically loaded with seawater after being lifted and launched, the seawater enters a ballast water tank 3 to form the ballast, the design draught, stability and gravity center requirements which are the same as those of the existing buoy can be still realized after the seawater loading is finished, and when the buoy needs to be recovered, the ballast can be automatically subtracted, and the weight of the materials of the buoy is finally returned; due to the reduced weight of the buoy, the construction, operation and maintenance costs of the buoy and the requirements on the marine operation vessel can be greatly reduced, and the safety of the marine operation is improved.
The venting means is connected to the ballast tank 3 and comprises a vent pipe 4, a vent valve 5, a quick coupling 9 and an air compressor (not shown). The one end of breather pipe 4 with 3 intercommunications in ballast water tank, the other end is followed buoy deck 1 stretches out, and sets up vent flap 5 top sets up quick-operation joint 9, air compressor with quick-operation joint 9 is connected, be used for to ballast water tank 3 lets in highly-compressed air, air compressor can locate on the buoy main part 2, also the air compressor on the usable operation boats and ships provides highly-compressed air. The aeration device can be used for controlling the ballast water tank 3 to realize the switching between a first state and a second state by controlling the opening and closing of the aeration valve 5 and controlling the introduction of high-pressure air, wherein the first state is that seawater enters the ballast water tank 3 through the limber hole 7, and the air pressure in the ballast water tank 3 is reduced to form and maintain ballast; in the second state, the air pressure in the ballast tank 3 is increased, and the seawater is discharged from the ballast tank 3 through the water passage hole 7 to remove the ballast. The aeration device has a simple structure, can easily control the ballast of the self-ballasting buoy by using the seawater, and greatly reduces the construction cost of the buoy.
The number of the ballast water tanks 3 is 4 to 6, and the height thereof is lower than or equal to the vertical distance from the waterline 10 of the buoy body 2 to the bottom of the buoy body 2, in this embodiment, the height thereof is equal to the vertical distance from the waterline 10 of the buoy body 2 to the bottom of the buoy body 2, so as to lower the center of gravity of the buoy body 2, ensure buoy stability, and design the volume of the ballast water tanks 3, defining the volume of the ballast water tanks 3 as V, the number of the ballast water tanks 3 as n, the design water intake and discharge amount of the buoy body 2 as m1, the weight of the buoy body 2 as m2, the anchoring system weight as m3, the design buoyancy as m4, and the density of seawater as ρ, then the weight of the buoy body 2 is m2, the design buoyancy of the anchoring system weight as m
The seawater in the ballast water tank 3 can form ballast with enough weight, so that the design draught, stability and gravity center requirements of the buoy using seawater self-ballast are met as same as those of the conventional buoy, and the safety of the buoy in the offshore operation process is improved.
One end of the emergency drain pipe 6 is arranged in the ballast water tank cabin and is close to the bottom of the ballast water cabin 3, and the other end of the emergency drain pipe penetrates through the top of the ballast water cabin 3 and extends out of the side face of the buoy body 2 so as to observe the injection amount of seawater and discharge the seawater when the ballast water cabin 3 is filled with the seawater. When seawater is observed to overflow from the emergency drainage pipe 6 in the process of forming ballast in the ballast water tank 3, the seawater is indicated to fill the ballast water tank 3, and the buoy body 2 reaches the draught depth and can be put into use; in the process of recovery, when high-pressure air is injected into the ballast water tank 3, one end of the emergency drain pipe 6 close to the bottom of the ballast water tank 3 can assist in discharging seawater in the tank, and when the emergency drain pipe 6 does not discharge seawater, the seawater is completely discharged, the buoy body 2 is in an idle state, and the hoisting recovery process of the buoy can be carried out. As shown in the figure, emergency drain pipe 6 is "L" type, and it is located one end in the ballast water tank cabin with the distance of 3 bottoms in ballast water cabin is 5 ~ 10cm, supplementary evacuation under-deck sea water, its follow the height of the other end that stretches out to buoy body 2 side is slightly higher than the waterline 10 of buoy body 2, in order to ensure when ballast water cabin 3 fills up, the sea water just can be followed emergency drain pipe 6 overflows.
In this embodiment, a maintenance gate 8 is further provided at the bottom of the ballast water tank 3 for maintenance of the ballast water tank 3.
The embodiment also provides a control method for the self-ballasting buoy using seawater, which comprises the following steps:
the method for controlling the self-ballast buoy to form ballast comprises the following steps:
opening the vent valve 5 to enable the inside of the ballast water tank 3 to be communicated with air outside the tank, arranging the self-ballast buoy on the water surface, enabling seawater to enter the ballast water tank 3 through the water through hole 7 to form ballast, enabling the self-ballast buoy to slowly sink, and when the ballast water tank 3 is filled with seawater, isolating the inside of the ballast water tank 3 from the air outside the tank, and enabling the seawater to stay in the ballast water tank 3 to keep the ballast; and
the method for controlling the self-ballast buoy to eliminate ballast comprises the following steps:
connecting an air compressor with a quick connector 9, opening a vent valve 5, and injecting high-pressure air into the ballast water tank 3 to enable seawater in the ballast water tank 3 to be discharged from the ballast water tank 3 through a water through hole 7 and an emergency drain pipe 6 to eliminate ballast, wherein when no seawater is discharged from one end of the emergency drain pipe 6 extending out of the side face of the buoy body 2, the ballast is completely eliminated.
The method for controlling the self-ballast buoy to form ballast comprises the steps of opening the vent valve 5 to enable the interior of the ballast water tank 3 to be communicated with air outside the tank, arranging the self-ballast buoy on the water surface, enabling seawater to enter the ballast water tank 3 through the water through hole 7 to form ballast by means of atmospheric pressure and the weight of the buoy body 2, enabling the self-ballast buoy to slowly sink, and enabling the seawater to stay in the ballast water tank 3 to keep ballast under the influence of volume limitation and air pressure when the seawater overflows from the emergency drain pipe 6 and indicates that the ballast water tank 3 is filled with the seawater.
Example 2
The present embodiment is different from embodiment 1 in that, in the method for controlling the ballast forming of the self-ballast buoy, when the ballast tank 3 is filled with seawater, the vent valve 5 is closed to isolate the inside of the ballast tank 3 from the air outside the tank and form an atmospheric pressure difference, so that the seawater stays in the ballast tank 3 to maintain the ballast.
Example 3
The present embodiment is different from embodiments 1 and 2 in that the ballast apparatus further includes a liquid level sensor disposed in the ballast water tank 3 and configured to detect a water level of seawater filled in the ballast water tank 3, the vent valve 5 is an electrically controlled vent valve electrically connected to the liquid level sensor, and the liquid level sensor controls the electrically controlled vent valve to close when detecting that the ballast water tank 3 is filled with seawater.
In the method for controlling the self-ballast buoy to form ballast, when the liquid level sensor detects that the ballast water tank 3 is filled with seawater, the electronic control ventilation valve is automatically controlled to be closed, so that the inside of the ballast water tank 3 is isolated from the air outside the tank and an atmospheric pressure difference is formed, and the seawater stays in the ballast water tank 3 to be kept ballast. Need not pass through emergent drain pipe 6 observes the interior water level of ballast water tank 3, also need not artifical manual close vent flap valve 5, and the vent flap valve 5 is closed in unison to be convenient for, simplifies operation personnel operation flow.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (10)
1. The utility model provides an utilize sea water from ballast buoy, includes the buoy body and locates the anchor system of buoy body bottom, its characterized in that sets up a plurality of ballast devices in the buoy body, and it includes:
a ballast tank for holding seawater;
the water through hole is formed in the bottom of the ballast water tank; and a breather connected to the ballast water tank for controlling the ballast water tank to switch between a first state and a second state,
the first state is that seawater enters the ballast water tank through the limber hole, and the air pressure in the ballast water tank is reduced to form and maintain ballast;
and in the second state, the air pressure in the ballast water tank is increased, and the seawater is discharged from the ballast water tank through the limber holes so as to eliminate ballast.
2. The seawater self-ballasting buoy of claim 1, wherein the aeration device comprises:
a vent pipe, one end of which is communicated with the ballast water tank;
the ventilation valve is arranged at the other end of the ventilation pipe;
the quick connector is arranged above the vent valve; and the air compressor is connected with the quick connector and is used for introducing high-pressure air into the ballast water tank.
3. The seawater self-ballasting buoy of claim 1, wherein the ballast apparatus further comprises an emergency drain having one end disposed in the ballast tank compartment near the bottom of the ballast tank and the other end extending out from the side of the buoy body through the top of the ballast tank for observing the amount of seawater to be filled and for discharging the seawater when the ballast tank is full.
4. The seawater self-ballasting buoy of claim 1, wherein the ballast tank has a height that is less than or equal to a vertical distance from a waterline of the buoy body to a bottom of the buoy body.
5. The seawater self-ballasting buoy of claim 1, wherein the number of the ballast tanks is 4 to 6.
6. The seawater self-ballasting buoy of claim 5, wherein the volume of the ballast tank is defined as V, the number of the ballast tanks is n, the buoy body is designed to have a draft displacement of m1, the weight of the buoy body is m2, the weight of the mooring is m3, the designed reserve buoyancy is m4, and the density of seawater is ρ, and then
7. The seawater self-ballasting buoy of claim 2, wherein the ballast apparatus further comprises a level sensor disposed in the ballast tank for detecting a level of seawater filled in the ballast tank, and/or the vent valve is an electrically controlled vent valve electrically connected to the level sensor, and the level sensor controls the electrically controlled vent valve to close when the ballast tank is filled with seawater.
8. The seawater self-ballasting buoy of any one of claims 1 to 7, wherein a maintenance gate is provided at the bottom of the ballast tank for maintenance of the ballast tank.
9. A method of controlling a self-ballasted buoy using seawater as defined in any one of claims 2 to 8, comprising:
the method for controlling the self-ballast buoy to form ballast comprises the following steps:
opening the vent valve to enable the interior of the ballast water tank to be communicated with air outside the ballast water tank, arranging the self-ballast buoy on the water surface, enabling seawater to enter the ballast water tank through the limber hole to form ballast, enabling the self-ballast buoy to slowly sink, closing the vent valve to isolate the interior of the ballast water tank from the air outside the ballast water tank when the ballast water tank is filled with seawater, and enabling the seawater to stay in the ballast water tank to keep the ballast water; and
the method for controlling the self-ballast buoy to eliminate ballast comprises the following steps:
the air compressor is connected with the quick connector, the vent valve is opened, high-pressure air is injected into the ballast water tank, seawater in the ballast water tank is discharged from the ballast water tank through the limber hole and the emergency drain pipe to eliminate ballast, and when the emergency drain pipe does not discharge seawater from one end extending out of the side surface of the buoy body, the ballast is completely eliminated.
10. The method of claim 9, wherein the self-ballasting buoy is controlled to be ballasted by closing a vent valve to isolate the interior of the ballast tank from the air outside the tank when the tank is filled with seawater, so that the seawater stays in the tank and remains ballasted.
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| CN204567976U (en) * | 2015-04-28 | 2015-08-19 | 中国船舶工业集团公司第七〇八研究所 | A kind of ballast chamber overvoltage protection structure |
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| CN105539751A (en) * | 2015-12-24 | 2016-05-04 | 三一海洋重工有限公司 | Semi-submersible type drilling platform and compressed air ballast adjusting system and method |
| CN211167300U (en) * | 2019-11-29 | 2020-08-04 | 中国电子科技集团公司第二十七研究所 | Intelligent water surface comprehensive monitoring buoy device |
| CN111619731A (en) * | 2020-05-29 | 2020-09-04 | 广船国际有限公司 | Ship ballast tank exhaust overflow system and ship |
| CN111959689A (en) * | 2020-09-11 | 2020-11-20 | 长沙紫宸科技开发有限公司 | Multifunctional marine water area environment monitoring device |
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