CN113107801A - Integrated device of steam-electricity mixed-driving condensation water-feeding pump set for ship and control method thereof - Google Patents
Integrated device of steam-electricity mixed-driving condensation water-feeding pump set for ship and control method thereof Download PDFInfo
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- CN113107801A CN113107801A CN202110457501.2A CN202110457501A CN113107801A CN 113107801 A CN113107801 A CN 113107801A CN 202110457501 A CN202110457501 A CN 202110457501A CN 113107801 A CN113107801 A CN 113107801A
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- pump
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- water
- integrated device
- water feed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/12—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/22—Arrangements for enabling ready assembly or disassembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a marine steam-electricity hybrid-drive condensing water feed pump set integrated device and a control method thereof. The integrated device of the steam-electric hybrid-drive condensing water pump set for the ship solves the technical problems of large configuration quantity, large volume structure, poor adaptability, complex operation and running, insufficient safety redundancy and the like in a narrow and severe marine environment.
Description
Technical Field
The invention relates to the technical field of marine steam power systems, in particular to a marine steam-electricity hybrid-drive condensing water pump set integrated device and a control method thereof.
Background
A condensate water supply system in a ship steam power system is a key system in steam-water circulation, the system coupling is strong, the operation conditions are multiple, the configuration equipment is complex, the operation performance of the condensate water supply system influences the stability and the safety of the whole steam power system, and the configuration equipment is an important factor which restricts the overall arrangement of an electromechanical cabin. The water feeding pump pressurizes and conveys the water with the oxygen content up to the standard in the deaerator to the main boiler or the steam generator to form the circulating power of the condensed water system.
The condensing and feeding pump is core equipment for ensuring condensing and feeding water circulation of the steam power device, and in order to ensure cavitation allowance of condensing and feeding water at the inlet of the pump, a certain height difference needs to exist between the condensing pump and a main condenser when the whole cloth is distributed, and the feeding pump and a deaerator form a certain height difference, so that the condensing and feeding pump is mostly arranged in the bottom area of an electric cabin. Meanwhile, the larger flow of steam-water circulation of a power system is considered, so that the power and the structural volume of a condensate pump and a feed pump are larger, the limited and narrow space of an engine-electric cabin area and the limited arrangement space of the condensate pump are obtained, and the use experience of a preorder ship shows that the faults of cavitation erosion of the feed pump, shaft breakage of the condensate pump and the like occur once, two turbine feed pumps and two turbine condensate pumps are generally configured by considering the operation safety of the steam power system, each type of pump adopts an operation use mode of one use and one standby, and a large number of configured turbines and electric condensate pumps bring larger problems to cabin arrangement.
Therefore, in order to solve the problems of large configuration quantity, large volume structure, poor adaptability, complex operation and running, insufficient safety redundancy and the like of the condensate water pump, the integrated device of the marine steam-electricity hybrid-drive condensate water pump set needs to be provided urgently, the integration of the functions of the condensate water pump and the water pump is realized, the comprehensive integration of multiple different driving sources of a steam turbine and a generator is realized, the operation safety of the pump set and the cabin space utilization rate of the ship loading arrangement are guaranteed, and the overall design storage technology of the related ship steam power system is provided.
Disclosure of Invention
The invention mainly aims to provide a marine steam-electricity hybrid-driven condensation water-feeding pump set integrated device and a control method thereof, aiming at realizing the functional fusion of a condensation water pump and a water-feeding pump and the comprehensive integration of multiple different driving sources of a steam turbine and a generator and forming the condensation water-feeding pump set integrated device driven by the steam turbine and a motor in a combined and alternate mode.
In order to achieve the aim, the invention provides a steam-electric hybrid-drive condensing and water-feeding pump set integrated device for a ship, which comprises a steam turbine, an electric motor, a synchronous automatic clutch, a reduction gear box, a water-feeding pump and a condensing pump, wherein,
the output shafts of the steam turbine and the motor are respectively connected with a first input shaft and a second input shaft of the reduction gear box through respective synchronous automatic clutches, a driving output shaft of the reduction gear box is fixedly connected with an input shaft of the water feeding pump, a driven output shaft of the reduction gear box is fixedly connected with an input shaft of the condensate pump, and the steam turbine or the motor is controlled to drive the reduction gear box to directly drive the water feeding pump and the condensate pump to normally operate through automatic engagement or disengagement of the synchronous automatic clutches.
Preferably, the integrated device of the marine steam-electric hybrid-driven condensate water feed pump unit further comprises a condensate booster pump which is positioned below the condensate pump and coaxially arranged with the condensate pump, and an outlet of the condensate booster pump is communicated with an inlet of the condensate pump through a condensate communicating pipe.
Preferably, the integrated device of the marine steam-electric hybrid-driven condensate water-feeding pump set further comprises a water-feeding booster pump which is positioned below the condensate water booster pump and coaxially arranged with the condensate water booster pump, and an outlet of the water-feeding booster pump is communicated with an inlet of the water-feeding pump through a water-feeding communicating pipe.
Preferably, the water feeding pump and the condensate pump are both three-stage vertical centrifugal pumps, and the condensate booster pump and the water feeding booster pump are both single-stage vertical centrifugal pumps.
Preferably, the steam turbine adopts an impulse type double-row compound speed stage structure, and the motor is a variable frequency motor.
Preferably, a plurality of vibration isolators are mounted below the housing of the reduction gear box.
Preferably, the upper ends of the feed pump and the condensate pump are both angular contact deep groove ball bearings installed in pairs, and the lower ends of the feed pump and the condensate pump are both water lubrication bearings.
Preferably, the reduction gearbox adopts a two-stage reduction double-branch output structure.
The invention further provides a control method of the integrated device of the marine steam-electric hybrid-drive condensing water pump set based on the marine steam-electric hybrid-drive condensing water pump set, which comprises the following steps:
under the normal operation condition, the motor is controlled to be in a standby state, the power of the steam turbine is increased to enable the synchronous automatic clutch connected with the steam turbine to be automatically engaged, so that the power is transmitted to the water feeding pump and the condensate pump through the reduction gear box, and the water feeding pump and the condensate pump are directly driven to operate;
when the steam turbine is in a fault working condition, the steam turbine is automatically disconnected from the reduction gear box through the synchronous automatic clutch, the motor is controlled to be started, power is improved, the synchronous automatic clutch connected with the motor is automatically meshed, and the power is transmitted to the water feeding pump and the condensate pump through the reduction gear box, so that the water feeding pump and the condensate pump are directly driven to operate.
The integrated device of the marine steam-electric hybrid driving condensing water feed pump set can solve the technical problems of large configuration quantity, large volume structure, poor assembling capability, complex operation and running, insufficient safety redundancy and the like in a narrow and severe marine environment, realizes the integrated integration of the condensing water feed pump set driven by the combined parallel operation of a steam turbine and a motor, not only improves the operation safety of the condensing water feed pump set, but also realizes the integrated installation and construction of the condensing water feed pump set, and is more favorable for the overall arrangement of a cabin of a whole ship.
Drawings
FIG. 1 is a schematic structural diagram of an integrated device of a marine steam-electric hybrid-drive condensing water-feed pump set according to the invention.
In the figure, 1, a steam turbine; 2. an electric motor; 3. a synchronous automatic clutch; 4. a reduction gear box; 5. a feed pump; 6. a condensate pump; 7. a condensed water booster pump; 8. a feed water booster pump; 9. a vibration isolator; 10. a feed water communicating pipe; 11. a condensed water communicating pipe.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention provides an integrated device of a steam-electric mixed-driving condensation water-feeding pump set for a ship.
Referring to fig. 1, in the preferred embodiment, the integrated device of the marine steam-electric hybrid-driven condensate-feed water pump set comprises a steam turbine 1, an electric motor 2, a synchronous automatic clutch 3, a reduction gear box 4, a feed water pump 5 and a condensate pump 6, wherein,
the output shafts of the steam turbine 1 and the motor 2 are respectively connected with a first input shaft and a second input shaft of the reduction gear box 4 through respective synchronous automatic clutches 3 (the steam turbine 1 and the motor 2 are respectively and directly connected with double input ends of the shared reduction gear box 4 in a double-motor parallel mode through the synchronous automatic clutches 3), the driving output shaft of the reduction gear box 4 is fixedly connected with the input shaft of the water feed pump 5, the driven output shaft of the reduction gear box 4 is fixedly connected with the input shaft of the condensate pump 6, and the steam turbine 1 or the motor 2 is controlled to drive the reduction gear box 4 to directly drive the water feed pump 5 and the condensate pump 6 to normally operate through automatic meshing or releasing of the synchronous automatic clutches 3.
Further, the integrated device of the marine steam-electric hybrid-driven condensate water feed pump unit further comprises a condensate booster pump 7 which is positioned below the condensate pump 6 and coaxially arranged with the condensate pump 6, and an outlet of the condensate booster pump 7 is communicated with an inlet of the condensate pump 6 through a condensate communicating pipe 11.
Furthermore, the integrated device of the steam-electricity mixed-driving condensation water-feeding pump set for the ship further comprises a water-feeding booster pump 8 which is positioned below the condensation water booster pump 7 and is coaxially arranged with the condensation water booster pump, and the outlet of the water-feeding booster pump 8 is communicated with the inlet of the water-feeding pump 5 through a water-feeding communicating pipe 10. The anti-cavitation capability of the large-flow water feed pump 5 is improved by arranging the water feed booster pump 8 as a preposed pump of the water feed pump 5 and directly connecting the outlet of the water feed booster pump 8 with the inlet of the water feed pump 5 through the water feed communicating pipe 10.
Because the general flow and the lift of marine condensate-feed pump are great, single-stage pump can not satisfy flow and lift demand, consequently, feed pump 5 and condensate pump 6 are three-stage vertical centrifugal pump in this embodiment, and condensate booster pump 7 and feed booster pump 8 are single-stage vertical centrifugal pump structural style. The reduction gear box 4 adopts a two-branch output structure with two-stage reduction.
The steam turbine 1 adopts an impulse type double-row compound speed stage structure, and the structure can reduce the volume of the steam turbine 1 under the same power, thereby being beneficial to the arrangement of equipment on a real ship. The motor 2 is a variable frequency motor. In addition, a plurality of vibration isolators 9 are installed below the casing of the reduction gear box 4, thereby reducing and eliminating vibration forces transmitted from the reduction gear box 4 to the foundation and vibrations transmitted from the foundation to the reduction gear box 4.
Specifically, in the present embodiment, the upper ends of the feed water pump 5 and the condensate pump 6 are both angular contact deep groove ball bearings installed in pairs, and the lower ends are both water lubricated bearings.
The working principle of the integrated device of the steam-electric mixed-driving condensing water pump set for the ship is as follows.
Under the normal operation condition, the motor 2 is in a standby state, the power of the steam turbine 1 is increased to enable the synchronous automatic clutch 3 connected with the steam turbine to be automatically meshed, so that the power is transmitted to the condensate water supply pump set through the reduction gear box 4, and the condensate water supply pump set (comprising the water supply pump 5 and the condensate water pump 6) is directly driven to operate.
Under the working condition that the steam turbine 1 has a fault, the steam turbine 1 is automatically disconnected from the reduction gear box 4 through the synchronous automatic clutch 3, and simultaneously, the PLC controls the motor 2 to automatically start and improve the power to enable the synchronous automatic clutch 3 connected with the motor to automatically mesh, so that the power is transmitted to the condensing and water feeding pump set through the reduction gear box 4, and the condensing and water feeding pump set is directly driven to operate.
Through the automatic engagement or disengagement of the synchronous automatic clutch 3, the steam turbine 1 and the motor 2 can be freely connected to the reduction gear box 4 to directly drive the condensing water pump set to normally operate, and the safe switching and operation of the condensing water pump set under normal and accident working conditions are realized.
The integrated device of the marine steam-electric hybrid-driven condensing and water-feeding pump set provided by the embodiment can solve the technical problems of large configuration quantity, large volume structure, poor adaptability, complex operation and running, insufficient safety redundancy and the like in a narrow and severe marine environment, realizes the integrated integration of the condensing and water-feeding pump set driven by the combined parallel operation of the steam turbine 1 and the motor 2, not only improves the operation safety of the condensing and water-feeding pump set, but also realizes the integrated installation and construction of the condensing and water-feeding pump set, and is more favorable for the overall arrangement of a cabin of a whole ship.
The invention provides a control method of an integrated device of a marine steam-electric mixed-drive condensing water feed pump set.
In the preferred embodiment, a control method based on the integrated device of the marine steam-electric hybrid-drive condensing water pump set includes the following steps:
under the normal operation condition, the motor 2 is controlled to be in a standby state, the power of the steam turbine 1 is increased to enable the synchronous automatic clutch 3 connected with the steam turbine to be automatically meshed, so that the power is transmitted to the water feed pump 5 and the condensate pump 6 through the reduction gear box 4, and the water feed pump 5 and the condensate pump 6 are directly driven to operate;
when the steam turbine 1 is in a fault working condition, the steam turbine 1 is automatically disconnected from the reduction gear box 4 through the synchronous automatic clutch 3, meanwhile, the motor 2 is controlled to be started and power is improved to enable the synchronous automatic clutch 3 connected with the motor to be automatically meshed, and the power is transmitted to the water feeding pump 5 and the condensate pump 6 through the reduction gear box 4, so that the water feeding pump 5 and the condensate pump 6 are directly driven to operate.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are intended to be covered by the scope of the present invention.
Claims (9)
1. An integrated device of a marine steam-electric hybrid-driven condensate water feed pump set is characterized by comprising a steam turbine, a motor, a synchronous automatic clutch, a reduction gear box, a water feed pump and a condensate pump, wherein,
the output shafts of the steam turbine and the motor are respectively connected with a first input shaft and a second input shaft of the reduction gear box through respective synchronous automatic clutches, a driving output shaft of the reduction gear box is fixedly connected with an input shaft of the water feeding pump, a driven output shaft of the reduction gear box is fixedly connected with an input shaft of the condensate pump, and the steam turbine or the motor is controlled to drive the reduction gear box to directly drive the water feeding pump and the condensate pump to normally operate through automatic engagement or disengagement of the synchronous automatic clutches.
2. The integrated device of a marine steam-electric hybrid-driven condensate water feed pump set according to claim 1, further comprising a condensate booster pump disposed below the condensate pump and coaxial therewith, wherein an outlet of the condensate booster pump is communicated with an inlet of the condensate pump through a condensate communicating pipe.
3. The integrated device of a marine gasoline-electric hybrid driving condensate water feed pump set according to claim 2, further comprising a water feed booster pump positioned below the condensate water booster pump and coaxially arranged therewith, wherein an outlet of the water feed booster pump is communicated with an inlet of the water feed pump through a water feed communicating pipe.
4. The integrated device of the marine gasoline-electric hybrid driving condensate water feed pump set according to claim 3, wherein the water feed pump and the condensate pump are both three-stage vertical centrifugal pumps, and the condensate booster pump and the water feed booster pump are both single-stage vertical centrifugal pumps.
5. The integrated device of a marine steam-electric hybrid-driving condensate water feed pump set according to claim 1, wherein the steam turbine adopts an impulse type double-row compound speed stage structure, and the motor is a variable frequency motor.
6. The integrated device of the marine gasoline-electric hybrid driving and condensing water feed pump set according to claim 1, wherein a plurality of vibration isolators are installed below the casing of the reduction gear box.
7. The integrated device of the marine gasoline-electric hybrid-driving condensation water feed pump set according to claim 2, wherein the upper ends of the water feed pump and the water condensation pump are both angular contact deep groove ball bearings installed in pairs, and the lower ends are both water lubrication bearings.
8. The integrated device of the marine steam-electric hybrid driving condensation water feed pump set according to claim 1, wherein the reduction gear box adopts a two-branch output structure with two-stage reduction.
9. The control method for the integrated device of the marine steam-electric hybrid-drive condensation water-pump set is characterized by comprising the following steps of:
under the normal operation condition, the motor is controlled to be in a standby state, the power of the steam turbine is increased to enable the synchronous automatic clutch connected with the steam turbine to be automatically engaged, so that the power is transmitted to the water feeding pump and the condensate pump through the reduction gear box, and the water feeding pump and the condensate pump are directly driven to operate;
when the steam turbine is in a fault working condition, the steam turbine is automatically disconnected from the reduction gear box through the synchronous automatic clutch, the motor is controlled to be started, power is improved, the synchronous automatic clutch connected with the motor is automatically meshed, and the power is transmitted to the water feeding pump and the condensate pump through the reduction gear box, so that the water feeding pump and the condensate pump are directly driven to operate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110457501.2A CN113107801A (en) | 2021-04-27 | 2021-04-27 | Integrated device of steam-electricity mixed-driving condensation water-feeding pump set for ship and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110457501.2A CN113107801A (en) | 2021-04-27 | 2021-04-27 | Integrated device of steam-electricity mixed-driving condensation water-feeding pump set for ship and control method thereof |
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| Publication Number | Publication Date |
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| CN113107801A true CN113107801A (en) | 2021-07-13 |
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| CN202110457501.2A Pending CN113107801A (en) | 2021-04-27 | 2021-04-27 | Integrated device of steam-electricity mixed-driving condensation water-feeding pump set for ship and control method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB208125A (en) * | 1922-12-06 | 1924-10-16 | Heinrich Boltshauser | Improvements in or relating to steam-locomotives |
| CN202971333U (en) * | 2012-12-28 | 2013-06-05 | 亿志机械设备(无锡)有限公司 | Novel vertical type multistage pump |
| CN104314786A (en) * | 2014-10-25 | 2015-01-28 | 大同煤矿集团有限责任公司 | Energy-saving boiler feed pump drive system for thermal power plant |
| CN204610172U (en) * | 2015-04-20 | 2015-09-02 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of vapour, electric hybrid drive boiler feed pump |
| CN205744007U (en) * | 2016-06-15 | 2016-11-30 | 西安交通大学 | Vapour electricity mixed power device and there is its thermal power generation system |
| CN106678269A (en) * | 2017-01-19 | 2017-05-17 | 中国船舶重工集团公司第七研究所 | Vibration and noise reduction device of thrust power module of marine diesel engine |
| CN210889246U (en) * | 2019-08-15 | 2020-06-30 | 中国船舶重工集团公司第七一九研究所 | Condensate pump group |
-
2021
- 2021-04-27 CN CN202110457501.2A patent/CN113107801A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB208125A (en) * | 1922-12-06 | 1924-10-16 | Heinrich Boltshauser | Improvements in or relating to steam-locomotives |
| CN202971333U (en) * | 2012-12-28 | 2013-06-05 | 亿志机械设备(无锡)有限公司 | Novel vertical type multistage pump |
| CN104314786A (en) * | 2014-10-25 | 2015-01-28 | 大同煤矿集团有限责任公司 | Energy-saving boiler feed pump drive system for thermal power plant |
| CN204610172U (en) * | 2015-04-20 | 2015-09-02 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of vapour, electric hybrid drive boiler feed pump |
| CN205744007U (en) * | 2016-06-15 | 2016-11-30 | 西安交通大学 | Vapour electricity mixed power device and there is its thermal power generation system |
| CN106678269A (en) * | 2017-01-19 | 2017-05-17 | 中国船舶重工集团公司第七研究所 | Vibration and noise reduction device of thrust power module of marine diesel engine |
| CN210889246U (en) * | 2019-08-15 | 2020-06-30 | 中国船舶重工集团公司第七一九研究所 | Condensate pump group |
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Application publication date: 20210713 |