CN111257130B - Double-layer cylinder type deep sea low-temperature environment simulation device - Google Patents
Double-layer cylinder type deep sea low-temperature environment simulation device Download PDFInfo
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- CN111257130B CN111257130B CN202010092014.6A CN202010092014A CN111257130B CN 111257130 B CN111257130 B CN 111257130B CN 202010092014 A CN202010092014 A CN 202010092014A CN 111257130 B CN111257130 B CN 111257130B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/0048—Hydraulic means
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a double-layer cylinder type deep sea low-temperature environment simulation device, which comprises a cylinder body, wherein the cylinder body comprises an outer sleeve, an inner sleeve, an upper flange and a lower flange, a plurality of spiral ascending threads are arranged on the outer surface of the inner sleeve, the thread crest surface of the inner sleeve is attached to the outer sleeve surface to form a sealed cooling channel, a cooling water inlet is arranged on the upper flange, a cooling water outlet is arranged on the lower flange, the cooling water inlet and the cooling water outlet are respectively connected with two ends of the cooling channel, and the cooling water inlet, the cooling water outlet, the cooling channel and an external cooling system form a cooling circulation loop.
Description
Technical Field
The invention relates to a deep sea low-temperature environment simulation device, in particular to a double-layer cylinder type deep sea low-temperature environment simulation device.
Background
The deep sea below 6000 meters is called sea chest deep-water (Hadal trench), and is an extremely conditioned deep sea area with ultra-high pressure (about 110MPa at the deepest), low temperature (2-4 ℃) and no light and unique marine ecology. The deep sea detecting and carrying equipment is required to bear the test of ultra-high sea static pressure and low temperature during deep sea/deep-water operation. Therefore, before the marine equipment enters deep sea operation, a special deep sea pressure simulation device is required to perform a series of reliability pressure tests such as structural compressive strength, fatigue strength and the like. At present, the traditional deep sea pressure simulation device in China can meet the requirement of simulating the deep-sea pressure of 110MPa or even higher, but due to the limitation of the traditional structural technology, the low-temperature control in the field of the large-volume large-pressure deep-sea simulation device (the pressure is more than or equal to 100MPa, and the inner diameter is more than or equal to 1000 mm) in China is not realized, so that the application range of the deep-sea pressure simulation device and the development of the deep-sea scientific research work are greatly limited. Particularly, in the process of carrying out partial deep sea special materials or instrument related experiments, such as solid buoyancy material pressure-resistant experiments used on a ten-thousand-meter manned submersible in China, the whole experimental process needs to be strictly controlled under the low-temperature condition, otherwise, adverse effects can be caused on the performance of the sample. Therefore, the realization of low-temperature control is an urgent requirement for the actual test application condition at present.
For microminiature or deep sea high-pressure analog devices with relatively thin cylinder walls with lower working pressure, the prior art generally arranges a cooling jacket on the outer wall of the cylinder, and then injects cooling medium into the cooling jacket, and the cooling medium takes away the heat of the environment in the cylinder through heat conduction of the cylinder walls to achieve the cooling effect. The large-volume deep sea ultrahigh pressure simulation device is used as a main development trend in the future in the field, and the low-temperature control in the cylinder cannot be basically and effectively realized by adopting the external jacket type cooling mode. The main reason is that the current cylinder bodies of the large-volume and large-pressure deep sea simulation device are all in a single-layer integrated structure, and the cylinder bodies of the structure bear ultrahigh radial force, so that the thickness of the cylinder walls is thicker, and if the traditional technical route is adopted, the low-temperature quick and effective control in the cylinder cannot be realized.
Disclosure of Invention
In view of the foregoing, it is necessary to provide a double-layer cartridge type deep-sea low-temperature environment simulation device capable of rapidly realizing low-temperature control of a deep-sea high-pressure simulation device, aiming at the defects existing in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the double-layer cylinder type deep sea low-temperature environment simulation device comprises a cylinder body, wherein the cylinder body comprises an outer sleeve, an inner sleeve, an upper flange and a lower flange, the outer sleeve is sleeved on the inner sleeve, the outer sleeve and the inner sleeve are cylinders with openings at the same two ends, the two ends of the outer sleeve and the inner sleeve are respectively fixedly connected with the upper flange and the lower flange, a plurality of spiral ascending threads are arranged on the outer surface of the inner sleeve, and the thread crest surface of the inner sleeve is attached to the surface of the outer sleeve to form a sealed cooling channel;
the upper flange is provided with a cooling water inlet, the lower flange is provided with a cooling water outlet, and the cooling water inlet and the cooling water outlet are respectively connected with two ends of the cooling channel;
the cooling water inlet and the cooling water outlet are also connected with an external cooling system, and the cooling water inlet, the cooling water outlet, the cooling channel and the external cooling system form a cooling circulation loop.
In some preferred embodiments, the upper flange and the lower flange are both provided with a flange plate, the flange plate is provided with a plurality of threaded holes, and the outer sleeve, the inner sleeve, the upper flange and the lower flange are fixedly connected with the flange plate through the threaded holes.
In some preferred embodiments, the openings at the upper end and the lower end of the cylinder are respectively provided with an upper end cover and a lower end cover, and the two ends of the cylinder are in sealing connection with the upper end cover and the lower end cover, so that a sealing cavity formed in the cylinder is used as a working area.
In some preferred embodiments, the lower end cap is further provided with a pressure transfer medium inlet into the barrel.
In some preferred embodiments, a temperature sensor is further provided in the cylinder, and the temperature sensor is used for detecting the temperature in the cylinder.
In some preferred embodiments, the barrel further comprises a layer of pre-stressed steel wire disposed on the outer sleeve outer surface.
In some preferred embodiments, the outer surface of the pre-stressed steel wire layer is provided with a skin, and the inner surface of the outer sleeve and the space between the pre-stressed steel wire layer and the skin are provided with a thermal insulation layer.
In some preferred embodiments, the device further comprises a frame, wherein an upper semicircular beam and a lower semicircular beam of the frame are respectively attached to the upper end cover and the lower end cover of the cylinder.
In some preferred embodiments, the frame further comprises a base, the frame is fixed on the base, the base is provided with a guide rail, and the frame can move along the guide rail.
The invention adopts the technical proposal has the advantages that:
the invention provides a double-layer barrel type deep sea low-temperature environment simulation device, which comprises a barrel body, wherein the barrel body comprises an outer sleeve, an inner sleeve, an upper flange and a lower flange, a plurality of spiral ascending threads are arranged on the outer surface of the inner sleeve, the thread crest surface of the inner sleeve is attached to the outer sleeve surface to form a sealed cooling channel, a cooling water inlet is arranged on the upper flange, a cooling water outlet is arranged on the lower flange, the cooling water inlet and the cooling water outlet are respectively connected with two ends of the cooling channel, an external cooling system is further connected with the cooling water inlet and the cooling water outlet, and the cooling water inlet, the cooling water outlet, the cooling channel and the external cooling system form a cooling circulation loop.
In addition, the double-layer cylinder type deep sea low-temperature environment simulation device provided by the invention adopts a double-layer cylinder design, and the inner sleeve wall is thinner, so that the device cannot directly bear larger pressure under the condition of large volume and large pressure, and two opposite forces are mutually offset under the compressive prestress exerted by the prestress steel wire layer additionally arranged outside the double-layer cylinder, so that the pressure-bearing performance of the inner sleeve is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic perspective view of a deep sea low temperature environment simulation device according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a barrel structure of a double-layer deep sea low temperature environment simulation device according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view of a barrel structure of a double-layer deep sea low temperature environment simulation device according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a barrel installation of a double-layer deep sea low temperature environment simulation device according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of an external cooling system of a double-layer deep sea low temperature environment simulation device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 4, the present invention provides a double-layer cartridge type deep sea low temperature environment simulation device, which comprises a cartridge 1, wherein the cartridge comprises an outer sleeve 102, an inner sleeve 101, an upper flange 106 and a lower flange 107.
The outer sleeve 102 is sleeved on the inner sleeve 101, the outer sleeve 102 and the inner sleeve 101 are cylinders with openings at the same two ends, and the two ends of the outer sleeve 102 and the inner sleeve 101 are fixedly connected with the upper flange 106 and the lower flange 107 respectively.
The outer surface of the inner sleeve 101 is provided with a plurality of spiral ascending threads 105, and the crest surface of the threads 105 of the inner sleeve 101 is jointed with the surface of the outer sleeve 102 to form a sealed cooling channel.
In some preferred embodiments, the inner diameter of the cylinder 1 is 1000mm, and the depth is 2500mm; the thickness of the wall of the inner sleeve 101 is 60mm, and the thickness of the wall of the outer sleeve 102 is 60mm; the width of the thread 105 of the inner sleeve 101 is 30mm, and the depth is 15mm; the highest working pressure of the double-layer cylinder type deep sea low-temperature environment simulation device provided by the embodiment can reach 200Mpa.
The upper flange 106 is provided with a cooling water inlet 401, the lower flange 107 is provided with a cooling water outlet 402, and the cooling water inlet 401 and the cooling water outlet 402 are respectively connected with two ends of the cooling channel.
The cooling water inlet 401 and the cooling water outlet 402 are also connected with an external cooling system, and the cooling water inlet 401, the cooling water outlet 402, the cooling channel and the external cooling system form a cooling circulation loop as shown in fig. 5.
It will be appreciated that the external cooling system injects a set temperature heat sink from the upper flange inlet 401 into the cooling channel of the inner sleeve 101, the heat sink with the heat sink takes the heat in the cylinder away through the cooling channel of the inner sleeve 101, and then the heat sink is discharged from the lower flange outlet 402 to the external cooling system for refrigeration treatment, waiting for the cooling cycle of the lower wheel.
It will be appreciated that the external cooling system may control the cooling rate of the environment of the inner sleeve 101 by adjusting the cold source temperature and the flow opening through the cooling passages.
Referring to fig. 5, a specific cooling control strategy for the double-layer cartridge type deep sea low temperature environment simulation device is as follows:
the cooling water maintains the liquid level of the water tank 506 through the water supplementing device 507, water with stable pressure in the water tank 506 enters a high-pressure pipeline after being pressurized through the cold water pump 501, and then a feedback signal is fed back through the thermometer in the cylinder, and the PLC 503 judges whether the pressurized water enters the cold water unit 502 for cooling. Solenoid valves MV-3 and MV-4 at the inlet of the chiller 502 control the flow of water into the chiller 502. The water with cold energy after being cooled by the water chiller 502 enters the spiral cooling channel 105 of the cylinder body, takes away the heat generated in the cylinder during operation, and then enters the water tank 506 to start the next cooling cycle. Wherein, the PLC 503 controls the opening of the electromagnetic valve through the collected temperature signal to realize the basic temperature control.
When the temperature of cooling water in the external cooling pipeline is higher than the set temperature, the cooling system performs circulating water cooling control in the cooling pipeline in advance: opening an electromagnetic valve MV-1MV-2MV-3MV-4MV-6, closing MV-5, starting a water pump 501 and a water chilling unit 502, performing circulating water cooling on a cooling pipeline, and directly entering a water tank 506 for circulating cooling without passing through a cooling channel 105 in the cylinder; when the temperature of the circulating water is reduced to the set temperature, the cooling control in the cylinder is started: the solenoid valve MV-5 is opened, MV-6 is closed, and the circulating water starts to cool the inside of the cylinder through the cylinder cooling passage 105.
In some preferred embodiments, the upper flange 106 and the lower flange 107 are provided with a flange 108, the flange 108 is provided with a plurality of threaded holes, and the outer sleeve 102, the inner sleeve 101, the upper flange 106 and the lower flange 107 are fixedly connected with the flange 108 through threaded holes and matched screws.
In some preferred embodiments, positioning rings 112 for positioning the cylinder 1 are further provided on the upper flange 106 and the lower flange 107.
In some preferred embodiments, the openings at the upper and lower ends of the cylinder 1 are respectively provided with an upper end cover 109 and a lower end cover 110, and the two ends of the cylinder 1 are connected with the upper end cover 109 and the lower end cover 110 in a sealing manner, so that a sealing cavity formed in the cylinder 1 is used as a working area.
Specifically, seal ring structures are provided on the inner peripheral surfaces of the openings at the upper and lower ends of the cylinder 1 and the outer peripheral surfaces of the upper end cover 109 and the lower end cover 110, and the upper end cover 109 and the lower end cover 110 form a seal cavity with the cylinder.
It will be appreciated that the upper end cover 109 and the lower end cover 110 are respectively provided with independent opening and closing devices, so that the automatic opening and closing functions of the upper end cover 109 and the lower end cover 110 can be realized. When in a working state, the upper end cover 109 and the lower end cover 110 are in a closed state, when the experiment is completed, an experiment sample can be taken out only by opening the upper end cover 109, and the lower end cover 110 is also provided with a pressure transmission medium inlet 403 which enters the cylinder.
In some preferred embodiments, a temperature sensor is further provided in the cylinder 1, and the temperature sensor is used for detecting the temperature in the cylinder 1.
In some preferred embodiments, the cylinder 1 further comprises a pre-stressed steel wire layer 103, and the pre-stressed steel wire layer 103 is disposed on the outer surface of the outer sleeve 102.
It can be appreciated that under the action of the prestress wire layer 103, the outer sleeve 102 and the inner sleeve 101 can be better pre-clung to form a whole; on the other hand, because the inner sleeve wall 101 is thinner, larger pressure cannot be directly born under the condition of large volume and large pressure, and because the two opposite forces are mutually counteracted under the pressure prestress exerted by the prestress wire layer 103 attached to the outer side of the double-layer cylinder, the pressure bearing performance of the inner sleeve 101 is improved, so that the inner sleeve 101 keeps the pressure bearing state even when bearing the maximum working radial pressure in the cylinder, the pressure bearing capacity of the inner sleeve 101 can be greatly improved, and the double-layer cylinder structure can meet the working requirement of ultrahigh pressure.
In some preferred embodiments, the outer surface of the pre-stressed steel wire layer 103 is provided with a skin 104, and the inner surface of the outer sleeve 102 and the space between the pre-stressed steel wire layer 103 and the skin 104 are provided with a thermal insulation layer, so as to prevent external heat from entering the low-temperature environment in the cylinder.
In some preferred embodiments, the double-layer cartridge type deep sea low temperature environment simulation device provided by the invention further comprises a frame 2 for fixing the cartridge 1, wherein the cartridge 1 is fixedly installed in the frame 2.
In some preferred embodiments, the double-layer cartridge type deep sea low temperature environment simulation device further comprises a base 3, the frame 2 is fixed on the base 3, the base 3 is provided with a guide rail, and the frame can move along the guide rail.
It can be understood that the frame 2 is used as a bearing structure of axial force when the deep sea high-voltage simulator is in a working state, the frame 2 can move on a track, the frame 2 moves to a preset position during working, an upper semicircular beam and a lower semicircular beam of the frame 2 are respectively attached to the upper end cover and the lower end cover of the cylinder body 1, and the frame 2 bears the axial ultrahigh pressure transmitted from the cylinder.
The double-layer cylinder type deep sea low-temperature environment simulation device provided by the embodiment of the invention has the following working modes:
(1) The external pressurizer enables working pressure medium water (seawater or fresh water) to enter the inner sleeve 101 from the pressure medium inlet 403 arranged on the lower end cover 110, and the inner sleeve 101 reaches a preset pressure to start to enter a pressure-proof experiment stage;
(2) When the temperature of the inner sleeve 101 is higher than the preset temperature, the temperature sensor arranged on the inner sleeve 101 feeds back a signal to the controller 503 of the external cooling system, and starts the cooling work;
(3) The external cooling system injects a cold source (low-temperature cooling water) with set temperature into the cooling channel 105 of the inner sleeve from the upper flange inlet 401, the cooling water with cold quantity takes away the heat in the cylinder through the cooling channel of the inner sleeve 101, and then the heat is discharged to the external cooling system from the lower flange outlet 402 for refrigeration treatment, and waiting for the cooling circulation of the lower wheel;
(4) When the temperature in the cylinder is cooled to a preset temperature, the external cooling system automatically stops working. The external cooling system can control the cooling rate of the inner sleeve 101 environment by adjusting the cooling water temperature and the flow of the cooling channels.
It is understood that in order to prevent the cooling water from freezing below 0 ℃ and possibly causing the problems of blockage of a cooling circulation pipeline and the like, glycol can be added into the cooling water of the working pressure medium.
The double-layer cylinder type deep sea low-temperature environment simulation device provided by the invention has the advantages that the traditional single-layer integrated cylinder structure is split into two layers, namely the inner sleeve and the outer sleeve, and the threads on the outer surface of the inner sleeve are used as cooling channels, so that the interval between a cold source and the inside of the cylinder is reduced, the cooling rate and the cooling effect are improved, and the low-temperature environment can be effectively maintained in the cylinder.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
Of course, the anode material of the double-layer cylinder type deep sea low temperature environment simulation device can also have various changes and modifications, and is not limited to the specific structure of the above embodiment. In general, the scope of the present invention should include those variations or alternatives and modifications apparent to those skilled in the art.
Claims (6)
1. The double-layer cylinder type deep sea low-temperature environment simulation device is characterized by comprising a cylinder body, wherein the cylinder body comprises an outer sleeve, an inner sleeve, an upper flange and a lower flange, the outer sleeve is sleeved on the inner sleeve, the outer sleeve and the inner sleeve are cylinders with openings at the same two ends, the two ends of the outer sleeve and the inner sleeve are fixedly connected with the upper flange and the lower flange respectively, a plurality of spiral ascending threads are arranged on the outer surface of the inner sleeve, and the thread crest surface of the inner sleeve is attached to the surface of the outer sleeve to form a sealed cooling channel;
the upper flange is provided with a cooling water inlet, the lower flange is provided with a cooling water outlet, and the cooling water inlet and the cooling water outlet are respectively connected with two ends of the cooling channel;
the cooling water inlet and the cooling water outlet are also connected with an external cooling system, and the cooling water inlet, the cooling water outlet, the cooling channel and the external cooling system form a cooling circulation loop;
the upper end cover and the lower end cover are respectively arranged at the openings of the upper end and the lower end of the cylinder, and the two ends of the cylinder are in sealing connection with the upper end cover and the lower end cover, so that a sealing cavity formed in the cylinder is used as a working area;
the cylinder body further comprises a prestress steel wire layer, and the prestress steel wire layer is arranged on the outer surface of the outer sleeve;
the upper flange and the lower flange are respectively provided with a flange plate, the flange plates are provided with a plurality of threaded holes, and the outer sleeve, the inner sleeve, the upper flange and the lower flange are fixedly connected with the flange plates through the threaded holes.
2. The double-layer cylinder type deep sea low-temperature environment simulation device according to claim 1, wherein the lower end cover is further provided with a pressure transmission medium inlet into the cylinder.
3. The double-layer cylinder type deep sea low-temperature environment simulation device according to claim 1, wherein a temperature sensor is further arranged in the cylinder body and used for detecting the temperature in the cylinder body.
4. The double-layer cylinder type deep sea low-temperature environment simulation device according to claim 3, wherein a skin is arranged on the outer surface of the prestressed steel wire layer, and a thermal insulation layer is arranged on the inner surface of the outer sleeve and between the prestressed steel wire layer and the skin.
5. The double-layer cylinder type deep sea low-temperature environment simulation device according to claim 1, further comprising a frame, wherein an upper semicircular beam and a lower semicircular beam of the frame are respectively attached to the upper end cover and the lower end cover of the cylinder.
6. The double-deck cylinder type deep sea low temperature environment simulation device according to claim 5, further comprising a base, wherein the frame is fixed on the base, the base is provided with a guide rail, and the frame can move along the guide rail.
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| CN202010092014.6A CN111257130B (en) | 2020-02-14 | 2020-02-14 | Double-layer cylinder type deep sea low-temperature environment simulation device |
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| CN202010092014.6A CN111257130B (en) | 2020-02-14 | 2020-02-14 | Double-layer cylinder type deep sea low-temperature environment simulation device |
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| CN115389244A (en) * | 2022-09-14 | 2022-11-25 | 四川航空工业川西机器有限责任公司 | Deep sea low-temperature ultrahigh-pressure environment simulation system and simulation method thereof |
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| CN102389906B (en) * | 2011-11-03 | 2013-12-25 | 清华大学 | Prestressed wire winding recipient |
| CN103216616A (en) * | 2013-04-26 | 2013-07-24 | 中国船舶重工集团公司第七○二研究所 | Assembling, disassembling and locking mechanism for shear-resistance blocks of ultrahigh pressure large diameter deep sea environment simulating device |
| CN106111218B (en) * | 2016-06-12 | 2018-01-26 | 中国船舶重工集团公司第七○二研究所 | Deep-sea high temperature and high pressure environment analogue means |
| CN107741363B (en) * | 2017-09-15 | 2020-06-23 | 中国科学院深海科学与工程研究所 | Frame type ultrahigh pressure environment simulation device and test method |
| CN108181954B (en) * | 2017-11-29 | 2018-12-18 | 浙江大学 | A kind of guarantor's Cryo Equipment for deep-sea sampling |
| CN110006816B (en) * | 2019-05-21 | 2023-12-05 | 烟台宏远氧业股份有限公司 | Deep sea environment simulation device |
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