A seawater pressure stabilizing device, a control method thereof and application
Patent Information
- Application Number
- CN202611365093.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-04
- Publication Date
- 2026-11-03
AI Technical Summary
Traditional seawater pressure stabilization devices fail to effectively consider the influence of gas inside the ballast tank during buoyancy adjustment, resulting in unstable pressure. Furthermore, existing devices are complex in structure and expensive, making them unsuitable for adapting to the actual environmental changes of deep-sea submersibles, and there is a risk of leakage and contamination of the hydraulic oil medium.
It adopts an air-based pressure stabilization system and a water-based pressure regulation system. Through seawater pumps and compressors, along with components such as solenoid valves and overflow valves, it achieves dynamic regulation of the pressure inside the ballast tank. It uses air as the medium for pressure stabilization, which is independent of water medium control and adapts to changes in the deep-sea environment.
It achieves stable control of pressure within the ballast tank, reduces the risk of pollution to the marine environment, decreases maintenance costs, and improves the accuracy and stability of buoyancy adjustment, making it suitable for deep-sea mobile equipment.
Smart Images
Figure CN123025920A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of deep-sea hydraulic equipment technology, specifically relating to a seawater pressure stabilizing device, its control method, and its application. Background Technology
[0002] Seawater pressure stabilization devices are crucial systems for buoyancy and pitch adjustments in deep-sea submersibles, and their performance directly impacts the submersible's operational stability and safety. The adjustable seawater ballast system uses high-pressure seawater pumps to inject or dewater water into ballast tanks filled with atmospheric pressure air, thereby adjusting the buoyancy of the deep-sea moving equipment.
[0003] Traditional pressurization devices often neglect the pressure changes in ballast tanks caused by gases within the tanks during buoyancy adjustment. During water injection, the pressure inside the ballast tanks increases continuously with the increase in water volume, ignoring phenomena such as air dissolution and escape, and approximating the water injection process as an isothermal compression process. However, during dewatering, the pressure inside the ballast tanks decreases continuously with the reduction of water volume, leading to instability in the internal pressure of the ballast tanks. Furthermore, when high-pressure deep-sea water is injected into the lower-pressure ballast tanks via a seawater pump, gases dissolved in the seawater escape, increasing the pressure inside the ballast tanks and exacerbating pressure fluctuations.
[0004] Currently, deep-sea environment pressure stabilization devices for seawater pumps are typically built on test benches and parameter settings for predetermined operating conditions (constant water pressure and flow rate), and cannot be perfectly applied to the constantly changing working environment of deep-sea submersibles in real-world conditions. Furthermore, they all use hydraulic oil as the transmission medium, requiring consideration of potential leaks and medium recovery issues, resulting in significant pollution and high costs. In addition, some devices are too complex or bulky to be effectively used in deep-sea mobile equipment. Summary of the Invention
[0005] The purpose of this invention is to provide a seawater pressure stabilizing device, its control method, and its application, which ensures pressure stability during the water injection and drainage processes inside the ballast tank through a gas-line pressure stabilizing system.
[0006] To achieve the above objectives, the present invention provides a seawater pressure stabilizing device, comprising: a ballast tank, a water pressure regulating system, and a gas pressure stabilizing system; the water pressure regulating system includes a seawater pump and a first control valve connected to the bottom of the ballast tank via an inlet pipe, for pumping water into the ballast tank at a target flow rate, and the bottom of the ballast tank is also provided with a drain pipe; The gas pressure stabilization system includes a gas cylinder, a compressor, and a second control valve connected to the top of the ballast tank via a gas pipeline, used to inject air into the remaining space at the top of the ballast tank to achieve automatic pressure stabilization of the ballast tank.
[0007] Furthermore, the second control valve includes a first overflow valve disposed between the gas cylinder and the compressor, and a first solenoid valve disposed between the compressor and the ballast chamber.
[0008] Furthermore, the second control valve also includes a first check valve disposed between the compressor and the first solenoid valve, a second overflow valve disposed on the gas supply pipeline between the first solenoid valve and the first check valve, a third overflow valve disposed on the gas supply pipeline between the first solenoid valve and the ballast tank, and a second solenoid valve connected to the outside being disposed on the gas supply pipeline between the first solenoid valve and the third overflow valve.
[0009] Furthermore, a first pressure sensor is provided between the gas cylinder and the first overflow valve; a second pressure sensor is provided between the first check valve and the first solenoid valve; and a third pressure sensor is provided between the second solenoid valve and the third overflow valve.
[0010] Furthermore, the first control valve includes a third solenoid valve, a fourth overflow valve, and a second check valve sequentially disposed between the seawater pump and the ballast tank, as well as a fourth solenoid valve disposed on the drainage pipeline.
[0011] Furthermore, a fourth pressure sensor is installed on the water inlet pipe between the second check valve and the ballast tank.
[0012] Furthermore, the sidewall of the ballast tank is provided with a cylinder slot and a compressor mounting slot for installing the gas cylinder and compressor.
[0013] The present invention also provides a control method for the seawater pressure stabilizing device described in any one of the above claims, comprising: starting a seawater pump to input a preset flow rate of water into the ballast tank; then turning off the seawater pump and starting a compressor to inject air into the ballast tank; when the pressure inside the ballast tank is greater than the current sea depth pressure, starting to drain water through the drainage pipe; then, according to the target sea depth, starting the seawater pump again, adjusting the water inlet and drainage rates to ensure that the water volume in the ballast tank meets the diving depth, and simultaneously adjusting the air pressure stabilizing system to ensure that the pressure inside the ballast tank is greater than the pressure at the target sea depth.
[0014] Furthermore, the control method includes a constant sea depth control mode and a variable sea depth control mode; the constant sea depth control mode includes: determining the current required water volume and target sea depth pressure in the ballast tank based on the target sea depth; then injecting the target required water volume into the ballast tank to submerge the ballast tank to the target depth, and then closing the inlet and outlet pipes; simultaneously, adjusting the air pressure stabilization system to ensure that the pressure in the ballast tank is greater than the target sea depth pressure; The variable sea depth control mode includes: calculating the rate of change of the target pressure value over time based on the rate of change of sea depth over time; calculating the target water inflow rate and the target water outflow rate based on the rate of change of the target pressure value over time; adjusting the water inflow rate and the water outflow rate in the ballast tank according to the target water inflow rate and the target water outflow rate; and simultaneously adjusting the air inflow rate so that the pressure in the ballast tank changes stably with the current sea depth pressure.
[0015] Furthermore, in the fixed sea depth control mode, the pressure in the ballast tank is adjusted by the second overflow valve and the third overflow valve. If the pressure in the ballast tank still increases, the pressure is released by the second solenoid valve. In the variable sea depth control mode, the seawater pump, compressor, second and third overflow valves, second and fourth solenoid valves are adjusted according to the rate of change of the target pressure value over time.
[0016] The present invention also provides an application of the seawater pressure stabilizing device described in any one of the above claims in the pressure stabilization of diving equipment.
[0017] In summary, compared with the prior art, the above-described technical solutions conceived by this invention mainly possess the following technical advantages: 1. This invention achieves controllable internal pressure of the ballast tank through an air pressure stabilization system, reduces large fluctuations in internal pressure during the entire injection and drainage process, reduces the impact of abnormal internal pressure on the seawater pump load, and enables the internal pressure of the ballast tank to dynamically match the external seawater environment pressure, making the buoyancy adjustment process more stable.
[0018] 2. Unlike traditional seawater pump pressure stabilization devices that pre-set water pressure and flow parameters and only adapt to predetermined test conditions, the air pressure stabilization method of this invention can dynamically adjust the gas pressure inside the ballast tank according to the real-time deep-sea environment depth and external seawater static pressure of the submersible. This allows for real-time matching of changes in external seawater pressure, reducing depth overshoot during the submersible's buoyancy and depth variation processes, and improving the control accuracy and operational stability of the deep-sea submersible's buoyancy control and constant-depth hovering.
[0019] 3. This invention uses air directly as the pressure-stabilizing working medium, eliminating the need for hydraulic oil. This eliminates the potential for hydraulic oil leakage and pollution of the marine environment. It also eliminates the need for hydraulic oil recovery components, reducing the need for medium replenishment, recovery, and maintenance. This significantly reduces the material and maintenance costs of the entire seawater pressure stabilizing device.
[0020] 4. The thermodynamic states of the air and water media can be independently controlled, and water and air are separated. With the cooperation of the pressure auxiliary device and valve components at all levels, the pressure and flow rate of deep seawater can be stably controlled, which greatly reduces labor and time costs.
[0021] 5. The startup process first completes pumping and pressurization, then enters a dynamic equilibrium state where the inflow and outflow rates are equal. After pressure is established and gas is removed, the diving and surfacing actions are carried out. This avoids unknown gas disturbances that may occur during direct buoyancy adjustment and improves the initial stability of depth control.
[0022] 6. This device is well integrated, has a simple structure, and is small in size. At the same time, the key equipment is easy and quick to assemble and disassemble, which is conducive to its deployment and long-term operation in deep-sea mobile equipment and confined spaces. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the principle of a seawater pressure stabilizing device based on a micro air compressor proposed in an embodiment of the present invention; Figure 2 This is a schematic diagram of a seawater pressure stabilizing device based on a micro air compressor, as proposed in an embodiment of the present invention. Figure 3 This is a schematic diagram of the top structure of a seawater pressure stabilizing device based on a micro air compressor, as proposed in an embodiment of the present invention. Figure 4 This is a side view of a seawater pressure stabilizing device based on a micro air compressor, as proposed in an embodiment of the present invention. Figure 5 This is a schematic diagram of the bottom structure of a seawater pressure stabilizing device based on a micro air compressor, as proposed in an embodiment of the present invention. Figure 6 This is a three-dimensional structural diagram of the ballast tank according to an embodiment of the present invention; Figure 7 This is a cross-sectional structural diagram of the ballast tank according to an embodiment of the present invention.
[0024] In all the accompanying drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1-High-pressure gas cylinder; 2.1-First pressure sensor; 2.2-Second pressure sensor; 2.3-Third pressure sensor; 2.4-Fourth pressure sensor; 3.1-First overflow valve; 3.2-Second overflow valve; 3.3-Third overflow valve; 3.4-Fourth overflow valve; 4-Compressor; 5.1-First solenoid valve; 5.2-Second solenoid valve; 5.3-Third solenoid valve; 5.4-Fourth solenoid valve; 6-Ballast tank; 6.1-Gas cylinder tank; 6.2-Compressor mounting slot; 6.3-Hatch cover; 6.4-Gas port; 6.5-Water port; 7-Seawater pump; 8.1-First check valve; 8.2-Second check valve. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.
[0026] Please see Figure 1-7 The present invention provides a seawater pressure stabilizing device based on a micro air compressor, which mainly includes a ballast tank 6, a water pressure regulating system and an air pressure stabilizing system; the water pressure regulating system includes a high-pressure seawater pump 7 connected to the bottom of the ballast tank through a water inlet pipe and a first control valve, for pumping water into the ballast tank 6 at a target flow rate, and the bottom of the ballast tank 6 is also provided with a drain pipe; The gas pressure stabilization system includes a high-pressure gas cylinder 1, a compressor 4, and a second control valve connected to the top of the ballast tank 6 via a gas pipeline. It is used to inject air into the remaining space at the top of the ballast tank 6 to achieve automatic pressure stabilization of the ballast tank.
[0027] A miniature air compressor draws in air at a predetermined pressure from a storage cylinder containing clean gas. After pressurization, the air is introduced into the ballast tank. Through compressor filtration and valve regulation, the seawater in the ballast tank can be pressurized at a predetermined rate or stabilized at a target value, achieving dynamic pressure changes. Furthermore, solenoid valves in the air pressure stabilization system allow for independent depressurization of the air medium within the ballast tank. A high-pressure seawater pump directly draws in water from the external environment and introduces it into the ballast tank. In addition to being connected to the air pressure stabilization system and the water pressure regulation system, the ballast tank is also connected to the external environment via solenoid valves, enabling independent depressurization of the internal water medium. The independent operation of the air and water media ensures that the water medium in the ballast tank maintains a stable pressure level or changes at a predetermined flow rate and pressurization rate, meeting the needs of various deep-sea working environments.
[0028] Specifically, the gas pressure stabilization system includes a high-pressure gas cylinder 1, a first pressure sensor 2.1, a first overflow valve 3.1, a micro compressor 4, a first check valve 8.1, a second pressure sensor 2.2, a second overflow valve 3.2, a first solenoid valve 5.1, a second solenoid valve 5.2, a third pressure sensor 2.3, a third overflow valve 3.3, and is finally connected to the ballast tank 6.
[0029] A first overflow valve 3.1 is located between the high-pressure gas cylinder 1 and the compressor 4, and a first solenoid valve 5.1 is located between the compressor 4 and the ballast chamber 6. A first check valve 8.1 is located between the compressor 4 and the first solenoid valve 5.1. A second overflow valve 3.2 is provided on the gas supply line between the first solenoid valve 5.1 and the first check valve 8.1. A third overflow valve 3.3 is provided on the gas supply line between the first solenoid valve 5.1 and the third overflow valve 3.3. A second solenoid valve 5.2, which communicates with the outside, is provided on the gas supply line between the first solenoid valve 5.1 and the third overflow valve 3.3. The overflow valves are installed on the gas lines to provide safety protection for the miniature air compressor and the ballast chamber, and to handle overpressure overflow.
[0030] A first pressure sensor 2.1 is also provided between the high-pressure gas cylinder 1 and the first overflow valve 3.1; a second pressure sensor 2.2 is provided between the first check valve 8.1 and the first solenoid valve 5.1, and a third pressure sensor 2.3 is provided between the second solenoid valve 5.2 and the third overflow valve 3.3.
[0031] Overflow valves 3.1 to 3.3 are used to protect the gas path and stabilize the inlet pressure of the compressor 4 and the ballast tank 6. By adjusting the first to third overflow valves 3.1 to 3.3 and the operating parameters of the compressor 4, the intake pressure of the ballast tank 6 can be regulated, thereby achieving pressure control of the water medium in the ballast tank 6 and meeting the variable operating condition requirements of the equipment in marine equipment. The above gas pressure regulation process can be completed independently of the water pressure regulation system; simply opening the second solenoid valve 5.2 is sufficient to achieve an independent gas pressure relief process.
[0032] This invention employs a miniature compressor to obtain clean gas from the high-pressure gas storage cylinder via a pressure reducing valve. The first solenoid valve 5.1 controls whether the gas is introduced into the ballast chamber 6 according to the required pressure, thereby setting the air pressure environment of the ballast chamber 6 and achieving pressure stabilization.
[0033] The miniature compressor, driven by an electric motor, draws in low-pressure air, increases its pressure, and then discharges gas at the required pressure. Its power is adjustable; by adjusting the corresponding air valve and power regulator, the discharge pressure of the miniature compressor can be adjusted, controlling the pressurization rate or stabilization value of the gas pressure within the ballast tank, thereby achieving pressure regulation of the water medium in the ballast tank.
[0034] Specifically, the water pressure regulating system includes a high-pressure seawater pump 7, a third solenoid valve 5.3, a fourth overflow valve 3.4, a second check valve 8.2, a fourth pressure sensor 2.4, and a fourth solenoid valve 5.4. It is ultimately connected to the ballast tank 6. The high-pressure seawater pump 7 receives its water directly from the external marine environment, and the fourth solenoid valve 5.4 is used for seawater depressurization, directly discharging the water medium in the ballast tank 6 into the outside environment. This depressurization process can be completed independently of the gas pressure stabilization system; simply opening the solenoid valve 5.4 is sufficient. Furthermore, By controlling the fourth overflow valve 3.4 and the seawater pump 7, the flow rate of seawater in the ballast tank 6 can be regulated, thereby controlling the flow rate variation of the water medium in the ballast tank. Integrating the pressure regulation process of the gas path stabilization system, this invention can achieve variable flow rate, variable pressure, and variable sea depth operation, not just meeting static requirements.
[0035] When in water injection mode, the water level in the ballast tank 6 rises, the air is pressurized, and the overpressure gas is discharged by opening and closing the second solenoid valve 5.2; when in drainage mode, the water level in the ballast tank 6 drops, the air volume increases, the pressure drops, and the overpressure gas is injected by opening and closing the first solenoid valve 5.1.
[0036] This invention discloses a seawater pressure stabilizing device based on a micro air compressor, which has a ballast tank, and its structure is shown in the attached figure. Figure 6 , 7 As shown. The ballast tank has the following structure: a gas cylinder tank 6.1; a compressor mounting slot 6.2; and a hatch cover 6.3. The hatch cover 6.3 has air holes 6.4 and water holes 6.5. The gas cylinders are placed in the gas cylinder tank 6.1 of the ballast tank for easy replacement, enabling the invention to operate stably and sustainably in various deep-sea environments.
[0037] Furthermore, due to its small size and high integration, this invention can be integrated into a deep-sea mobile device, making it suitable for a wider range of testing scenarios compared to other similar inventions. The seawater pump, compressor, and gas cylinders can all be quickly replaced, ensuring the long-term operation of this invention.
[0038] The working mode of this invention is as follows: When starting the device, the steps are as follows: 1. Open the third solenoid valve 5.3 and seawater pump 7 to supply water to ballast tank 6. Here, the inlet of seawater pump 7 is the same as the environment in which the deep-sea submersible is located, and seawater is directly pumped into ballast tank 6. 2. After a period of time, shut off seawater pump 7 and solenoid valve 5.3. Start compressor 4, open solenoid valve 5.1, and introduce high-pressure gas into ballast tank 6. Observe the reading of the fourth pressure sensor 2.4; 3. When the reading of the fourth pressure sensor 2.4 is higher than the current ocean depth pressure, the fourth solenoid valve 5.4 is opened, allowing seawater in the ballast tank 6 to be discharged from the submersible into the deep-sea environment, and the current ocean depth pressure can be reduced. p = ρgh get; 4. Start seawater pump 7 to maintain a dynamic balance in the seawater level within ballast tank 6, meaning the injection rate equals the drainage rate. This operation, achieved by simultaneously opening independent inlet and drainage circuits, creates a dynamic balance. Combined with the compressor supplying air to the pressure tank's air chamber, this ensures the internal pressure of the pressure tank remains higher than the external deep-sea pressure. Even if a slight leak occurs in the drain valve, only the internal medium leaks outwards, effectively preventing high-pressure seawater from backflowing into the upper air chamber of the pressure tank through valve gaps. This reduces the risk of seawater contamination and damage to gas components, and enhances the sealing tolerance in deep-sea environments.
[0039] 5. Observe the readings of each sensor. If the seawater pressure and liquid level in the ballast tank 6 remain stable, it can be considered that the device described in this invention has completed the start-up setup.
[0040] (1) Dinghai Deep Working Mode: 1. In constant sea depth operating mode, the pressure of the seawater medium in ballast tank 6 should remain constant; 2. After completing the startup steps, you can set the Dinghai depth working mode; 3. Based on the startup procedure settings, keep compressor 4 running continuously, solenoid valve 5.1 normally open, and observe whether the readings of pressure sensors 2.2 and 2.3 are stable; 4. The relationship between sea depth and water pressure can be derived from: p = ρgh Calculations are performed for a given ocean depth. h set First, adjust the seawater pump 7 and solenoid valve 5.3 to ensure that the water volume in the ballast tank 6 meets the predetermined sea depth. h set Then, during the descent, adjust the set pressures of the second relief valve 3.2 and the third relief valve 3.3: p set = ρgh set Alternatively, adjust the opening and closing of the second solenoid valve 5.2 to make the air pressure and water pressure in the pressure cylinder exceed the predetermined value. p set At this time, constant pressure control of the seawater medium can be achieved by releasing air; when diving to a predetermined depth... h set When suspended, the water inlet and outlet can be shut off to maintain a constant water volume in ballast tank 6; 5. If the pressure in the ballast tank increases in a short period of time, it can be relieved by gas pressure through the third overflow valve 3.3; 6. If a pressure increase occurs over a prolonged period, the main reason is that the pressure relief rate of the third relief valve 3.3 is lower than the pressure boosting rate of the compressor 4. Specifically, the set pressures of the second and third relief valves 3.2 and 3.3 can be reduced first, and the second solenoid valve 5.2 can be opened. If simple gas venting cannot achieve pressure balance, the seawater pump 7 can be further shut down. 7. After prolonged operation, the pressure of water and air media in the pressure cylinder may decrease due to leakage and other issues. In this case, the pressure compensation can be completed by increasing the set pressure of the second and third overflow valves 3.2 and 3.3.
[0041] In this operation, the high-pressure deep-sea water pumped in by the seawater pump enters the pressure chamber. Changes in pressure conditions cause dissolved gases in the seawater to precipitate and form bubbles. This solution, under dynamic equilibrium conditions with constant water level and buoyancy, achieves continuous seawater displacement within the chamber. The precipitated bubbles can be directly discharged outside the chamber via the drainage circuit, preventing continuous gas accumulation in the pressure chamber's gas cavity. This solves the problems of uncontrollable total gas volume and pressure-water level drift in traditional sealed adjustable ballast tanks, reducing the impact of gas disturbances on buoyancy adjustment accuracy.
[0042] (2) Variable ocean depth working mode: 1. In the variable ocean depth working mode, the deep-sea pressure where the submersible is located should change over time. After completing the above start-up steps, the variable ocean depth working mode can be set. 2. Based on the startup procedure settings, keep compressor 4 running continuously and observe whether the readings of pressure sensors 2.2 and 2.3 are stable; 3. After the readings stabilize, complete the initial working state settings according to the fixed sea depth working mode; 4. To simulate the depth changes of a submersible, the time-varying characteristics of sea depth and water pressure can be derived from: Calculate, where the change in sea depth over time is a known parameter, ρ is the density of seawater, and g is the acceleration due to gravity; 5. The water volume in ballast tank 6 should be adjusted according to the submersible's surfacing and diving requirements. Specifically, the submersible's acceleration during buoyancy and snorkeling can be calculated using the following formula: Obtained. Among them. Q For inflow and outflow rates, M For the mass of the submersible. Generally, Q out Due to the influence of solenoid valve 5.4, it is not used for direct acceleration control. a Instead, it is adjusted by controlling the speed of the drive motor of the seawater pump 7. Q in This enables the submersible to accelerate its buoyancy and ultimately achieves ocean depth control; 6. In ballast tank 6, the pressure regulation of the seawater medium is achieved by adjusting the gas pressure. Specifically, the pressurization rate of the water medium in ballast tank 6 satisfies the formula:
[0043] in, The boost rate of compressor 4, The pressurization rate of seawater pump 7, The pressure reduction rate of the second relief valve 3.2 The pressure reduction rate of the third relief valve 3.3 The pressure reduction rate of the second solenoid valve 5.2 This refers to the pressure reduction rate of the fourth solenoid valve 5.4. Generally, the set pressures of 3.2 and 3.3 are adjusted first. When gas release cannot be controlled, solenoid valve 5.2 is opened or seawater pump 7 is shut down. The adjustment method is the same as that described in the constant sea depth working mode.
[0044] Parts replacement: 1. After prolonged operation, the gas in high-pressure cylinder 1 will be depleted, requiring replacement to ensure the long-term use of this invention. When replacing the cylinder, close solenoid valve 5.1, turn off compressor 4, and wait for the readings of pressure sensors 2.1 and 2.2 to stabilize. Then, remove cylinder 1, install a new cylinder, start compressor 4, and open solenoid valve 5.1 after the readings of pressure sensors 2.1 and 2.2 have stabilized.
[0045] 2. After prolonged operation, compressor 4 needs to be removed for maintenance. Before removing compressor 4, close solenoid valve 5.1 to shut down compressor 4. After the readings of pressure sensors 2.1 and 2.2 stabilize, remove gas cylinder 1 and compressor 4 in sequence. After maintenance, reinstall compressor 4 and gas cylinder 1 in sequence, start compressor 4, and after the readings of pressure sensors 2.1 and 2.2 stabilize, open solenoid valve 5.1.
[0046] After prolonged operation, seawater pump 7 needs to be removed for maintenance. Before removing seawater pump 7, turn it off. After the pressure sensor readings 2.2~2.4 stabilize, close solenoid valves 5.3 and 5.4, remove seawater pump 7, and after maintenance, reinstall seawater pump 7, open solenoid valves 5.3 and 5.4, and start seawater pump 7.
[0047] In summary, during the ballast tank water injection operation, as seawater is continuously injected into the tank, the air inside is compressed. This invention uses an air pressure stabilizing mechanism to compensate / release the gas inside the tank in real time, offsetting the isothermal compression effect of the air caused by seawater injection and preventing a continuous abnormal increase in the internal pressure of the ballast tank. During the drainage operation, as seawater is discharged from the tank, the internal volume increases. The air pressure stabilizing mechanism replenishes the ballast tank with gas in a timely manner, preventing the internal pressure from continuously decreasing as the water volume decreases and preventing the formation of negative pressure inside the tank.
[0048] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A seawater pressure stabilizing device, characterized in that, include: Ballast tank, water pressure regulating system and air pressure stabilizing system; the water pressure regulating system includes a seawater pump and a first control valve connected to the bottom of the ballast tank via an inlet pipe, for pumping water into the ballast tank at a target flow rate, and the bottom of the ballast tank is also provided with a drain pipe; The gas pressure stabilization system includes a gas cylinder, a compressor, and a second control valve connected to the top of the ballast tank via a gas pipeline, used to inject air into the remaining space at the top of the ballast tank to achieve automatic pressure stabilization of the ballast tank.
2. The seawater pressure stabilizing device according to claim 1, characterized in that, The second control valve includes a first overflow valve disposed between the gas cylinder and the compressor, and a first solenoid valve disposed between the compressor and the ballast chamber.
3. The seawater pressure stabilizing device according to claim 2, characterized in that, The second control valve further includes a first check valve disposed between the compressor and the first solenoid valve, a second overflow valve disposed on the gas supply pipeline between the first solenoid valve and the first check valve, a third overflow valve disposed on the gas supply pipeline between the first solenoid valve and the ballast tank, and a second solenoid valve connected to the outside being disposed on the gas supply pipeline between the first solenoid valve and the third overflow valve.
4. The seawater pressure stabilizing device according to claim 3, characterized in that, A first pressure sensor is also provided between the gas cylinder and the first overflow valve; a second pressure sensor is provided between the first check valve and the first solenoid valve, and a third pressure sensor is provided between the second solenoid valve and the third overflow valve.
5. The seawater pressure stabilizing device according to any one of claims 1-4, characterized in that, The first control valve includes a third solenoid valve, a fourth overflow valve, and a second check valve arranged sequentially between the seawater pump and the ballast tank, as well as a fourth solenoid valve arranged on the drainage pipeline.
6. The seawater pressure stabilizing device according to claim 5, characterized in that, A fourth pressure sensor is installed on the water inlet pipe between the second check valve and the ballast tank; The side wall of the ballast tank is provided with a cylinder slot and a compressor mounting slot for installing the gas cylinders and compressor.
7. A control method for the seawater pressure stabilizing device according to any one of claims 1-6, characterized in that, include: Start the seawater pump to input a preset flow rate of water into the ballast tank; Then, the seawater pump is turned off and the compressor is started to inject air into the ballast tank. When the pressure in the ballast tank is greater than the current sea depth pressure, drainage begins through the drainage pipe. Then, according to the target sea depth, the seawater pump is started again, and the water in the ballast tank is adjusted to meet the diving depth by adjusting the water inlet and drainage rates. At the same time, the air pressure stabilization system is adjusted to ensure that the pressure in the ballast tank is greater than the pressure at the target sea depth.
8. The control method for the seawater pressure stabilizing device according to claim 7, characterized in that, The control method includes a constant sea depth control mode and a variable sea depth control mode. The constant sea depth control mode includes: determining the current required water volume and the target sea depth pressure in the ballast tank based on the target sea depth; then injecting the target required water volume into the ballast tank to submerge it to the target depth; and then closing the inlet and outlet pipes. Simultaneously, the pressure in the ballast tank is maintained above the target sea depth pressure by adjusting the air pressure stabilization system. The variable sea depth control mode includes: calculating the rate of change of the target pressure value over time based on the rate of change of sea depth over time; calculating the target water inflow rate and the target water outflow rate based on the rate of change of the target pressure value over time; adjusting the water inflow rate and the water outflow rate in the ballast tank according to the target water inflow rate and the target water outflow rate; and simultaneously adjusting the air inflow rate so that the pressure in the ballast tank changes stably with the current sea depth pressure.
9. The control method for the seawater pressure stabilizing device according to claim 8, characterized in that, In the fixed sea depth control mode, the pressure in the ballast tank is adjusted by the second overflow valve and the third overflow valve. If the pressure in the ballast tank still increases, the pressure is released by the second solenoid valve. In the variable sea depth control mode, the seawater pump, compressor, second and third overflow valves, second and fourth solenoid valves are adjusted according to the rate of change of the target pressure value over time.
10. The application of the seawater pressure stabilizing device according to any one of claims 1-6 in the pressure stabilization of diving equipment.