CN112918651A - Buoyancy adjusting device and method for medium-shallow depth submersible - Google Patents
Buoyancy adjusting device and method for medium-shallow depth submersible Download PDFInfo
- Publication number
- CN112918651A CN112918651A CN202110267987.3A CN202110267987A CN112918651A CN 112918651 A CN112918651 A CN 112918651A CN 202110267987 A CN202110267987 A CN 202110267987A CN 112918651 A CN112918651 A CN 112918651A
- Authority
- CN
- China
- Prior art keywords
- water
- valve
- pressure
- pump
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
- B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
- B63G8/14—Control of attitude or depth
- B63G8/22—Adjustment of buoyancy by water ballasting; Emptying equipment for ballast tanks
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a buoyancy regulating device and a buoyancy regulating method for a shallow and medium depth submersible, which comprise a pressure-resistant water tank, wherein a pump source is installed at the bottom of the pressure-resistant water tank, a water drainage branch and a water injection branch which are communicated with the pump source are arranged outside the pressure-resistant water tank, the pump source comprises a motor and a seawater pump, the seawater pump is connected with a water inlet filter, an outlet of the seawater pump is connected with a safety valve, and one end of a pipeline extending out of the safety valve is opened; the drainage branch road includes the check valve that is linked together with the delivery port of sea water pump, and check valve intercommunication drainage ooff valve, drainage ooff valve are connected with logical sea filter, logical sea filter and external sea water intercommunication, the water injection branch road includes the water injection filter with withstand voltage cabin bottom intercommunication, the one end intercommunication of intaking of water injection filter has the orifice, and the one end intercommunication of intaking of orifice has the governing valve, and the one end intercommunication of intaking of governing valve has the water injection ooff valve, the one end of intaking and the logical sea filter intercommunication of water injection ooff valve, the water injection ooff valve communicates with the drainage ooff valve, has reduced the valve member quantity of system.
Description
Technical Field
The invention relates to the technical field of diving devices, in particular to a buoyancy adjusting device and method for a diving device with medium and shallow depth.
Background
The change of seawater density caused by the increase of weight after the submersible is sampled, or the reduction of weight after other equipment is released, or the change of water medium characteristics such as underwater pressure and temperature; as the submergence depth is increased, the pressure-resistant structure of the submersible is elastically deformed to cause the change of the water discharge volume, and the factors cause the balance of gravity and buoyancy to be broken. Therefore, buoyancy adjustment is required to ensure that the submersible has a relatively stable working attitude at a certain depth.
At present, the buoyancy regulating methods of the submersible comprise an oil pump type, a piston type, an anchor chain type, a gasoline type, a high-pressure air type and a seawater pump type, and the existing regulating methods have various limitations, for example, the oil pump type has large volume and is only applied to small unmanned submersible with the requirement of small buoyancy regulating capacity; the seawater pump type buoyancy adjusting method is characterized in that a plunger of a seawater pump bears a force matched with working pressure in two directions, and the current commercially available seawater pump plunger bears the following stress working conditions: the plunger piston bears the force matched with the working pressure during the compression stroke, and only bears smaller return force during the return stroke, so the return stroke of the plunger piston of the commercially available seawater pump generally adopts a spring return stroke, some plunger pistons adopt a forced return stroke and only design a return mechanism with weaker structural strength, and the wrapping design of a sliding shoe and the head part of the plunger piston is designed according to the working condition of smaller return force, so the development difficulty and the development cost of the seawater pump type buoyancy regulating method are high, and the reliability cannot be effectively ensured due to the grinding piece; under the working condition of medium and shallow depth, the existing buoyancy adjusting method is difficult to simultaneously meet the requirements of compact structure, lower cost and high reliability.
Disclosure of Invention
The applicant provides a buoyancy adjusting device and method for a submersible with a medium and shallow depth, which have a reasonable structure, aiming at the defects in the prior art, and the purposes of reducing the number of valves of the whole system, reducing the volume, reducing the cost and improving the reliability are achieved by arranging a water injection branch, a water drainage branch and a pump source and controlling water injection by a speed regulating valve instead of the pump source in a water path.
The technical scheme adopted by the invention is as follows:
a buoyancy adjusting device for a shallow and medium depth submersible comprises a pressure-resistant water tank, a pump source is arranged at the bottom of the pressure-resistant water tank, a drainage branch and a water injection branch which are communicated with the pump source are arranged outside the pressure-resistant water tank,
a liquid level meter is arranged on the inner wall of the pressure-resistant water tank,
the pump source comprises a motor and a seawater pump driven by the motor, a water inlet of the seawater pump is connected with a water inlet filter, an outlet of the seawater pump is connected with a safety valve, and one end of the pipeline extending out of the safety valve is provided with an opening; the pump source is immersed under the liquid level of the pressure-resistant water tank,
the water discharge branch comprises a one-way valve communicated with the water outlet of the seawater pump, the water outlet direction of the one-way valve is communicated with a water discharge switch valve, the water outlet direction of the water discharge switch valve is connected with a sea filter, the sea filter is communicated with the outside seawater,
the water injection branch road includes the water injection filter with withstand voltage sump bottom intercommunication, the one end intercommunication of intaking of water injection filter has the orifice, and the one end intercommunication of intaking of orifice has the governing valve, and the one end intercommunication of intaking of governing valve has the water injection ooff valve, and the one end and the logical sea filter intercommunication of intaking of water injection ooff valve, water injection ooff valve and drainage ooff valve intercommunication.
The drainage switch valve and the water injection switch valve are normally closed two-position two-way valves, and the valve core is of a ball valve structure or a cone valve structure.
The structure of the throttle hole is as follows: the inlet pressure is 1/3-1/2 of the inlet pressure of the speed regulating valve.
The throttle hole 302 needs to be specially designed to ensure the inlet pressure thereof, and the throttle hole 302 in this embodiment needs to be designed to have the inlet pressure of 1/3-1/2 of the inlet pressure of the speed regulating valve 303.
The motor is sealed and packaged, and the sea water pump adopts an axial plunger pump.
The air pressure above the liquid level in the pressure-resistant water cabin is atmospheric pressure.
An adjusting method of a buoyancy adjusting device for a medium and shallow depth submersible comprises the following steps:
and (3) a drainage process: the water discharge switch valve is connected, the motor drives the seawater pump, the seawater pump runs to pump seawater in the pressure-resistant water cabin, and the seawater in the pressure-resistant water cabin flows through the water inlet filter, the seawater pump, the one-way valve and the water discharge switch valve in sequence and is filtered by the sea filter to be released into the external seawater environment;
and (3) water injection process: and (4) switching on the water injection switch valve, and inputting the outside seawater into the pressure-resistant water tank after sequentially passing through the sea filter, the water injection switch valve, the speed regulating valve, the throttling hole and the water injection filter.
The invention has the following beneficial effects:
the invention has compact and reasonable structure and convenient operation, adopts the commercial seawater pump with mature technology, and reduces the economic cost of the whole system. The sea water pump is the loop with the lowest reliability in the whole system, the reliability of the whole system depends on the sea water pump, and the commercially available sea water pump is a technically mature product after long-term market inspection, so the reliability of the invention is guaranteed.
In the invention, the seawater pump and the motor are packaged in the pressure-resistant water tank, and the water injection branch and the water drainage branch have fewer branches and fewer connected valves, so that the valves forming the two branches can adopt a plug-in valve block form, and the system volume is further reduced.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Wherein: 1. a pressure-resistant water tank; 2. a water discharge branch; 3. a water injection branch; 4. a liquid level meter; 5. a motor; 6. a sea water pump; 7. a water inlet filter; 8. a safety valve; 9. a sea-dredging filter;
201. a one-way valve; 202. a drain switching valve;
301. a water injection filter; 302. an orifice; 303. a speed regulating valve; 304. a water injection switch valve.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, the buoyancy adjusting device for a shallow and medium depth submersible of the present embodiment includes a pressure-resistant water tank 1, a pump source is installed at the bottom of the pressure-resistant water tank 1, a water discharging branch 2 and a water injecting branch 3 communicated with the pump source are arranged outside the pressure-resistant water tank 1,
the inner wall of the pressure-resistant water tank 1 is provided with a liquid level meter 4,
the pump source comprises a motor 5 and a sea water pump 6 driven by the motor 5, a water inlet of the sea water pump 6 is connected with a water inlet filter 7, an outlet of the sea water pump 6 is connected with a safety valve 8, and one end of the pipeline extending out of the safety valve 8 is provided with an opening; the pump source is immersed under the liquid level of the pressure-resistant water tank 1,
the drainage branch 2 comprises a one-way valve 201 communicated with the water outlet of the seawater pump 6, the water outlet direction of the one-way valve 201 is communicated with a drainage switch valve 202, the water outlet direction of the drainage switch valve 202 is connected with a sea filter 9, the sea filter 9 is communicated with the outside seawater,
the water injection branch 3 comprises a water injection filter 301 communicated with the bottom of the pressure-resistant water tank 1, a water inlet end of the water injection filter 301 is communicated with an orifice 302, a water inlet end of the orifice 302 is communicated with a speed regulating valve 303, a water inlet end of the speed regulating valve 303 is communicated with a water injection switch valve 304, a water inlet end of the water injection switch valve 304 is communicated with the sea filter 9, and the water injection switch valve 304 is communicated with the drainage switch valve 202.
The drain switch valve 202 and the water filling switch valve 304 are normally closed two-position two-way valves, and the valve core is of a ball valve structure or a cone valve structure.
The structure of the throttle hole 302 is: the inlet pressure is 1/3-1/2 of the inlet pressure of the speed valve 303.
The motor 5 is sealed and packaged, and the sea water pump 6 adopts an axial plunger pump.
The air pressure above the liquid level in the pressure-resistant water tank 1 is atmospheric pressure.
The adjusting method of the buoyancy adjusting device for the medium and shallow depth submersible comprises the following steps:
and (3) a drainage process: the drainage switch valve 202 is connected, the motor 5 drives the seawater pump 6, the seawater pump 6 runs, seawater in the pressure-resistant water cabin 1 is extracted, and the seawater in the pressure-resistant water cabin 1 flows through the water inlet filter 7, the seawater pump 6, the one-way valve 201 and the drainage switch valve 202 in sequence, is filtered by the seawater filter 9 and is released into the external seawater environment;
and (3) water injection process: the water filling switch valve 304 is turned on, and the outside seawater passes through the sea strainer 9, the water filling switch valve 304, the speed control valve 303, the orifice 302, and the water filling strainer 301 in this order, and is then fed into the pressure-resistant water tank 1.
The concrete structure and the working process of the invention are as follows:
as shown in fig. 1, the present invention includes a pressure-resistant water tank 1, a water discharge branch 2 connected to the pressure-resistant water tank 1, and a water inlet branch. The present invention is suitable for the medium and shallow depth seawater environment, and therefore fig. 1 of the present invention is a state of being immersed in seawater, and the present embodiment is also described on the premise that the apparatus is in the seawater environment.
Seawater is filled in the pressure-resistant water tank 1, and a liquid level meter 4 is arranged on the inner wall of the pressure-resistant water tank 1 and used for monitoring the liquid level in the pressure-resistant water tank 1 in time. The bottom of the pressure-resistant water tank 1 is provided with a pump source, the power source of the pump source is a sea water pump 6 driven by a motor 5, the sea water pump 6 is connected with a water inlet filter 7, and the sea water in the pressure-resistant water tank 1 passes through the water inlet filter 7, is pumped by the sea water pump 6 and then is output out of the pressure-resistant water tank 1 through a pipeline. A safety valve 8 is arranged on a pipeline for outputting seawater by the seawater pump 6.
The pipeline outside the sea water pump 6 output pressure-resistant water tank 1 is communicated with a one-way valve 201, one output end of the one-way valve 201 is connected with a drainage switch valve 202, and one output end of the drainage switch valve 202 is connected with a sea filter 9.
A water injection pipeline is communicated with the bottom of the pressure-resistant water tank 1, and a water injection switch valve 304, a speed regulating valve 303, an orifice 302 and a water injection filter 301 are sequentially arranged on the water injection pipeline along the flow direction of seawater. The output end of the water injection filter 301 is communicated with the pressure-resistant water tank 1, and the seawater passes through the water injection filter 301 and then is input into the pressure-resistant water tank 1. The drain switching valve 202 and the fill switching valve 304 are in communication, and both the drain switching valve 202 and the fill switching valve 304 are pilot operated valves. After connection, the control is carried out through the same oil way.
When the pressure-resistant water tank is used, the process is divided into a drainage process and a water inlet process, the seawater in the pressure-resistant water tank 1 is drained in the drainage process, and the buoyancy is increased; seawater is input into the pressure-resistant water cabin 1 in the water injection process, and the buoyancy is reduced. The process of draining and filling water is illustrated in the orientation of fig. 1.
The drainage process specifically comprises the following steps:
the motor 5 drives the sea water pump 6, the drainage switch valve 202 is connected to the right, and the sea water in the pressure-resistant water tank 1 passes through the water inlet filter 7, the sea water pump 6, the one-way valve 201, the drainage switch valve 202 and the sea filter 9 in sequence and then is discharged to the external sea water environment. Under the drainage working condition, the atmospheric pressure at the inlet of the seawater pump 6, the working pressure at the outlet of the seawater pump are the system working pressure, and the environment outside the pump body is the atmospheric pressure. Commercially available sea water pumps 6 can meet the above requirements.
The water injection process specifically comprises the following steps:
the water injection switch valve 304 is connected to the right position, and seawater flows through the sea filter 9, the water injection switch valve 304, the speed regulating valve 303, the throttling hole 302 and the water injection filter 301 in sequence and then enters the pressure-resistant water tank 1; the speed regulating valve 303 can make the whole water injection process controllable, and the orifice 302 serves as a liquid resistance for partial pressure, so that the problems of influence on reliability caused by vibration, valve port erosion corrosion and the like due to overlarge pressure difference of an inlet and an outlet of the speed regulating valve 303 are avoided.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (6)
1. The utility model provides a shallow and medium depth is buoyancy adjusting device for dive, includes withstand voltage water tank (1), its characterized in that: a pump source is arranged at the bottom of the pressure-resistant water tank (1), a water drainage branch (2) and a water injection branch (3) which are communicated with the pump source are arranged outside the pressure-resistant water tank (1),
the inner wall of the pressure-resistant water tank (1) is provided with a liquid level meter (4),
the pump source comprises a motor (5) and a seawater pump (6) driven by the motor (5), a water inlet of the seawater pump (6) is connected with a water inlet filter (7), an outlet of the seawater pump (6) is connected with a safety valve (8), and one end of the pipeline extending out of the safety valve (8) is provided with an opening; the pump source is immersed under the liquid level of the pressure-resistant water tank (1),
the drainage branch (2) comprises a one-way valve (201) communicated with a water outlet of the seawater pump (6), the water outlet direction of the one-way valve (201) is communicated with a drainage switch valve (202), the water outlet direction of the drainage switch valve (202) is connected with a sea filter (9), the sea filter (9) is communicated with external seawater,
the water injection branch (3) comprises a water injection filter (301) communicated with the bottom of the pressure-resistant water tank (1), the water inlet end of the water injection filter (301) is communicated with a throttling hole (302), the water inlet end of the throttling hole (302) is communicated with a speed regulating valve (303), the water inlet end of the speed regulating valve (303) is communicated with a water injection switch valve (304), the water inlet end of the water injection switch valve (304) is communicated with the sea filter (9), and the water injection switch valve (304) is communicated with a water drainage switch valve (202).
2. The buoyancy adjusting device for the medium and shallow depth submersible as claimed in claim 1, wherein: the drainage switch valve (202) and the water injection switch valve (304) are normally closed two-position two-way valves, and the valve core is of a ball valve structure or a cone valve structure.
3. The buoyancy adjusting device for the medium and shallow depth submersible as claimed in claim 1, wherein: the structure of the throttle hole (302) is as follows: the inlet pressure is 1/3-1/2 of the inlet pressure of the speed regulating valve (303).
4. The buoyancy adjusting device for the medium and shallow depth submersible as claimed in claim 1, wherein: the motor (5) is sealed and packaged, and the sea water pump (6) adopts an axial plunger pump.
5. The buoyancy adjusting device for the medium and shallow depth submersible as claimed in claim 1, wherein: the air pressure above the liquid level in the pressure-resistant water tank (1) is atmospheric pressure.
6. An adjusting method using the buoyancy adjusting device for the medium and shallow depth diving device as claimed in claim 1, characterized by comprising the following steps:
and (3) a drainage process: the water drainage switch valve (202) is connected, the motor (5) drives the seawater pump (6), the seawater pump (6) runs to pump seawater in the pressure-resistant water tank (1), and the seawater in the pressure-resistant water tank (1) flows through the water inlet filter (7), the seawater pump (6), the one-way valve (201) and the water drainage switch valve (202) in sequence, is filtered by the sea filter (9) and is released into the external seawater environment;
and (3) water injection process: and (3) switching on the water injection switch valve (304), and inputting the outside seawater into the pressure-resistant water tank (1) after passing through the sea filter (9), the water injection switch valve (304), the speed regulating valve (303), the throttle hole (302) and the water injection filter (301) in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110267987.3A CN112918651B (en) | 2021-03-12 | 2021-03-12 | Buoyancy adjusting device and method for medium-shallow depth submersible |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110267987.3A CN112918651B (en) | 2021-03-12 | 2021-03-12 | Buoyancy adjusting device and method for medium-shallow depth submersible |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112918651A true CN112918651A (en) | 2021-06-08 |
| CN112918651B CN112918651B (en) | 2022-02-18 |
Family
ID=76172800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110267987.3A Active CN112918651B (en) | 2021-03-12 | 2021-03-12 | Buoyancy adjusting device and method for medium-shallow depth submersible |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112918651B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113492958A (en) * | 2021-07-16 | 2021-10-12 | 武汉钢铁有限公司 | Buoyancy-adjustable buoy and adjusting method |
| CN115027651A (en) * | 2022-06-27 | 2022-09-09 | 中国船舶科学研究中心 | High-precision integrated buoyancy regulating system and operation method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106143847A (en) * | 2016-07-29 | 2016-11-23 | 中国海洋大学 | A kind of fluid pressure buoyancy regulating device and method |
| CN107878716A (en) * | 2017-10-30 | 2018-04-06 | 北京精密机电控制设备研究所 | A kind of buoyancy regulating device based on sea water pump |
| US20180273146A1 (en) * | 2014-11-13 | 2018-09-27 | Mørenot Offshore As | Bridle Block for a Deflector |
| CN109987206A (en) * | 2019-04-02 | 2019-07-09 | 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 big depth Natural Circulation gerotor type exchange of seawater system |
| CN110884634A (en) * | 2019-12-23 | 2020-03-17 | 武汉华喜特种液压设备有限公司 | System and method for controlling buoyancy adjustment for variable volume by seawater pump |
| CN110979601A (en) * | 2019-11-30 | 2020-04-10 | 浙江横海科技有限公司 | Buoyancy and attitude adjustment integrated system of manned submersible |
-
2021
- 2021-03-12 CN CN202110267987.3A patent/CN112918651B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180273146A1 (en) * | 2014-11-13 | 2018-09-27 | Mørenot Offshore As | Bridle Block for a Deflector |
| CN106143847A (en) * | 2016-07-29 | 2016-11-23 | 中国海洋大学 | A kind of fluid pressure buoyancy regulating device and method |
| CN107878716A (en) * | 2017-10-30 | 2018-04-06 | 北京精密机电控制设备研究所 | A kind of buoyancy regulating device based on sea water pump |
| CN109987206A (en) * | 2019-04-02 | 2019-07-09 | 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 big depth Natural Circulation gerotor type exchange of seawater system |
| CN110979601A (en) * | 2019-11-30 | 2020-04-10 | 浙江横海科技有限公司 | Buoyancy and attitude adjustment integrated system of manned submersible |
| CN110884634A (en) * | 2019-12-23 | 2020-03-17 | 武汉华喜特种液压设备有限公司 | System and method for controlling buoyancy adjustment for variable volume by seawater pump |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113492958A (en) * | 2021-07-16 | 2021-10-12 | 武汉钢铁有限公司 | Buoyancy-adjustable buoy and adjusting method |
| CN115027651A (en) * | 2022-06-27 | 2022-09-09 | 中国船舶科学研究中心 | High-precision integrated buoyancy regulating system and operation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112918651B (en) | 2022-02-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112918651B (en) | Buoyancy adjusting device and method for medium-shallow depth submersible | |
| CN106516057B (en) | A kind of hydraulic system for adjusting complete extra large deep diving hydrophone buoyancy | |
| CN107600376B (en) | Multifunctional integrated energy-saving type adjustable ballast system of full-sea deep submersible vehicle | |
| RU2630490C1 (en) | Pumping plant for gas withdrawal from annular space in oil well | |
| CN103466047B (en) | The reciprocating buoyancy regulating device of a kind of self-sustaining profile buoy platform | |
| EP2422045A2 (en) | Processes and systems for treating oil and gas wells | |
| CN112249236A (en) | Double-acting booster cylinder type buoyancy adjusting device of deep sea submersible | |
| CN102866072B (en) | Pressure vessel pressure cyclic test device | |
| CN203511992U (en) | Self-holding type reciprocating buoyancy adjusting device for section buoy platform | |
| CN103557135A (en) | Double-working-condition self-adaption linear motor driven pump and method for achieving constant current output thereof | |
| CN110805577B (en) | Gas-liquid separation type constant-pressure oil tank and control method | |
| CN111619775A (en) | Multifunctional equalization system of underwater equipment | |
| US4565496A (en) | Oil well pump system and method | |
| CN103557193B (en) | For the hydraulic system of formation sampling instrument | |
| CN204173386U (en) | A kind of type of respiration automatic dehydration return oil system for hydrocone type oil tank | |
| CN114251327B (en) | Performance testing device of buoyancy adjusting system of underwater robot | |
| CN203127102U (en) | Subsurface buoy hydraulic buoyant force driving system | |
| CN204663903U (en) | A kind of jet pump device | |
| CN205859311U (en) | Shit gathering equipment water pressurizer | |
| CN108716455B (en) | Hydraulic booster pump | |
| CN214001976U (en) | Double-acting booster cylinder type buoyancy adjusting device of deep sea submersible | |
| CN110979608B (en) | Buoyancy adjusting system based on double pumps | |
| CN205000953U (en) | Hydraulic pressure oil production device that oil extraction was used | |
| CN217897835U (en) | Pneumatic hydraulic lever transmission defoaming agent injection device | |
| CN114919723B (en) | Front-mounted autonomous supercharged underwater buoyancy regulating system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |