CN107024367A - A kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow and the method for sampling - Google Patents
A kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow and the method for sampling Download PDFInfo
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- CN107024367A CN107024367A CN201710400158.1A CN201710400158A CN107024367A CN 107024367 A CN107024367 A CN 107024367A CN 201710400158 A CN201710400158 A CN 201710400158A CN 107024367 A CN107024367 A CN 107024367A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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Abstract
The invention discloses the portable anti-adjustable deep siphon sampling apparatus of turbulent flow of one kind and the method for sampling, belong to water quality monitoring technical field.The present invention includes floating body, suction hose, bend pipe and water suction component, described suction hose runs through floating body, suction hose one end connection water suction component, other end bridge piece, described bend pipe water inlet is higher than the bending section of the bend pipe, vertical range of the bend pipe water inlet away from bend pipe bottom is 18mm~20mm, and waterline is provided with floating body sidewall, and vertical range of the waterline away from bend pipe water inlet is 50mm.The present invention can effectively prevent water quality turbulent flow generation, realize automatic continuous water intaking process, simple to operate, efficiency of producing drinking water is high by siphon principle and the ingenious combination of water quality sampling process.
Description
Technical field
The present invention relates to water quality monitoring technical field, more specifically to the portable anti-adjustable deep siphon of turbulent flow of one kind
Sampling apparatus and the method for sampling.
Background technology
With developing rapidly for social economy, China's problem of environmental pollution is increasingly highlighted, and particularly water environment pollution is presented
Extension, intensification trend.In order to strengthen water environment treatment monitoring, the distribution situation of pollutant in water body is grasped, detected in time,
Need to carry out the work such as substantial amounts of sampling of water quality, thus to ensure water sampling water quality ageing and accuracy.
For live water body sampling work, according to《Quality standard for surface water》(GB3838-2002) regulation is " it is required that water sample
Natural subsidence 30min after collection, takes the non-settlement section in upper strata to be analyzed by prescriptive procedure ".《Surface water and sewage monitoring technology
Specification》(HJ/T 91-2002) regulation " if containing settleable solids in water sample, cartridge type glass is poured into after should institute's water sampling be shaken up
Glass container, stands 30min, and the water sample without settleable solids but containing suspended solid is moved into sample container and guarantor is added
Deposit agent ".《National surface water environment quality monitoring net monitors Mission Operations guiding book》Middle regulation is " if monitoring section water sample is clear
Clear, scene can directly carry out water sample packing without natural subsidence 30min ".And in actual samples, perform above-mentioned specification compared with
It is difficult.Required according to above-mentioned standard, water sample needs to stand 30min in sampler, then needs to be inserted to water sample top layer 50mm with suction pipe
Following position is carried out once or repeatedly drawing water sample, and operation is more bothered, if containing a large amount of suspended materials in water sample, by inhaling
Pipe once or repeatedly draws water sample, easily forms water quality turbulent flow, causes to contain a large amount of solid suspension matter, shadow in institute's water sampling
The detection of Xiangshui County's matter.
In addition, with the renewal and development of technology, current water quality acquisition technique with water quality monitoring technology in order to be able to be combined,
Automation water-supply method is gradually developed into, wherein the water fetching device automated is varied, it is both simple including intake pipe, water bottle etc.
Water fetching device, includes the large-scale water fetching device being connected with water pump again.The fields such as environmental quality monitoring of developing into of technology are provided
Very big facility, improves the ageing of detection.However, water quality is still the puzzlement in industry the problem of turbulent.
The adverse effect that water quality turbulent flow is brought mainly includes two aspects.First, suspended in institute's water sampling containing a large amount of solids
Material, water quality detection is affected.Secondly, bulky grain solid material buildup also results in the blockage problem of intake.
In order to overcome the turbulent adverse effect of water quality, through retrieval, more skill also has been disclosed in the prior art
Art scheme, such as China Patent No. 200910024538.5, this application case disclose a kind of side of protection water inlet of water sampler
Method, it is intercepted to a large amount of suspended materials and silt etc. by primary protection screen pack and secondary filtration head, adopted so as to protect
Storage water inlet.The device plays a role preventing the blocking of collector water inlet.But this application case overall structure compared with
For complexity, cost is higher, in order to ensure that the part of screen pack and filtering head can effectively be run, and undesirably increases cleaning dress
Put, further increase cost and structural complexity.China Patent No. 201210472785.3, this application case discloses a kind of water
The water quality monitoring system of matter sampler and the application device, it, will by gas by being passed through gas to closed sampling device
Water sample is extruded, and realizes sampling of water quality, Gas Input part with water without directly contact, it is not easy to resulted in blockage, damaged
Phenomenon, and due to without extra draw power, phenomenon is stirred in the absence of when drawing；But, although the gas components of this application case
It is not easily blocked, but the water inlet pipe mouth of acquisition water sample is opened down from sample cell, and the process that water sample is automatically flowed into still has introducing
The possibility of deposition solid and suspended particulate, long-term use also results in water inlet blocking.And the introducing of gas components adds volume
Outer cost, is unfavorable for promoting.
It was found from above-mentioned analysis, prior art mostly be from protection water inlet angle come overcome water quality turbulent flow brought lack
Fall into, usual way is increase filter screen or filter to increase defence line, the source not occurred from water quality turbulent flow but considers, therefore
Also simply cure the symptoms, not the disease, do not tackle the problem at its root.
China Patent No. 201420600029.9 discloses a kind of new water quality collector, and this application case will be adopted by the body of rod
Collection bottle is positioned in water, is treated that water body is stable and is acquired, bottle stopper is combined setting by the device with rope and elastomeric element, passes through rope
The collection and closing of water sample are realized in sub- folding and unfolding, and this device is not susceptible to agitation in gatherer process, can be avoided during sampling a large amount of solid
The suction of body particle, overcoming traditional collector easily makes water quality produce muddiness, the defect that a large amount of impurity are introduced.This application case can
With say had contemplated that never produce water quality turbulent flow angle come prevent water intaking when solid particle introducing, but its still exist with
Lower defect：1) serialization of sampling can not be realized；2) such as rubber band or spring part are set, and long-term shrink is easily damaged.
In order that collection water sample serialization, there is also the water fetching device that some utilize simple principle in the prior art.As in
State's patent No. 00122194.9 discloses a kind of method and apparatus of liquid-lifting siphonage, this application case using atmospheric pressure and
The rule of siphonage, reaches that liquid draws the effect put forward, makes its process continuous and automatic of fetching water, without the use of electrical equipment.In
State's patent No. 201010501514.7 discloses a kind of vavuum pump auxiliary siphon off water device and method.The device is also based on section
About the direction of the energy considers, using siphon principle, is started siphon using vavuum pump, siphon off water pipe is kept continuously
Stable operation.Although above two device make use of siphon principle, attempt that using simple mechanism automatic continuous take can be completed
Water process.However, application is narrower, it is impossible to solve the defect of water quality turbulent flow occurred during water intaking.
Therefore need a kind of simple and practical water fetching device of research and development badly, the defect of water quality turbulent flow can be overcome, and can realize certainly
The continuous water intaking process of dynamicization.
The content of the invention
1. the invention technical problem to be solved
Prior art troublesome poeration when carrying out sampling of water quality is directed to, and produces the phenomenon of water quality turbulent flow, causes water intaking
Efficiency is low, water turbidity, a series of problems, such as intake is blocked, and there is provided one kind is portable by protracted experience summary by the present invention
The anti-turbulent flow of formula is adjustable deep siphon sampling apparatus；The present invention is by siphon principle and the ingenious combination of sampling of water quality process, intake and bottom
Portion keeps distance and opening upwards enough, makes institute's water sampling limpid, the generation of water quality turbulent flow is effectively prevented, while can realize
Automatically continuously water intaking, simple and practical, and efficiency of producing drinking water is high.
2. technical scheme
To reach above-mentioned purpose, the technical scheme that the present invention is provided is：
A kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the present invention, including floating body, suction hose, bend pipe and water suction
Component, described suction hose runs through floating body, one end connection water suction component of the suction hose, the other end bridge piece of suction hose,
The water inlet of described bend pipe is higher than the bending section of the bend pipe.
As further improvement of the present invention, described vertical range of the bend pipe water inlet away from bend pipe bottom for 18mm~
20mm。
As further improvement of the present invention, waterline is provided with described floating body sidewall, the waterline is away from bend pipe
The vertical range of water inlet is 50mm.
As further improvement of the present invention, described water suction component includes the first sebific duct, water suction ball and the second sebific duct,
Water suction ball both sides connect the first sebific duct and the second sebific duct respectively, and the other end of the first sebific duct is connected with suction hose.
As further improvement of the present invention, flow regulator is provided with the second described sebific duct, second sebific duct
Delivery port vertical height be less than institute's water sampling liquid level.
As further improvement of the present invention, described bend pipe is provided with 2-6, and 2-6 bend pipe connects with suction hose
Lead to, and 2-6 bend pipe is uniformly distributed in the horizontal direction.
As further improvement of the present invention, described floating body is to be provided with opening above hollow ball, the floating body,
The opening is sealed by sealing-plug.
As further improvement of the present invention, described suction hose is straight tube, and the suction hose is passed through along the axis of floating body
Wear floating body.
As further improvement of the present invention, described floating body and suction hose are glass material；Described water suction ball is
Silica gel water suction ball；Described sealing-plug is rubber stopper.
A kind of portable anti-adjustable deep siphon method of sampling of turbulent flow of the present invention, is placed in the water surface to be sampled by floating body, passes through
Addition weightening thing, makes waterline on floating body concordant with liquid level inside to floating body, then extruding water suction ball, controls sample water from bend pipe
Water inlet is flowed into, and is flowed out successively through suction hose, the first sebific duct, water suction ball and the second sebific duct, while being adjusted by flow regulator
Water sample flow.
3. beneficial effect
The technical scheme provided using the present invention, compared with existing known technology, with following effective：
(1) a kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the invention, the source produced from water quality turbulent flow goes out
Hair, according to the characteristics of water sample upper strata is limpid after standing, on the one hand sets bend pipe water inlet to be higher than bending section, makes water inlet limpid
Water sample keeps enough distances with bottom deposit particle；The opening upwards of water intaking bend pipe, also make water intaking suction be derived from water inlet
Top, so as to effectively prevent that bottom deposit particle from being risen by suction and is introduced into, it is ensured that the limpid water sample in upper strata is interference-free；Separately
On the one hand siphon principle is utilized, water suction ball is given after first suction, and limpid water sample is to automatically flow into water intaking bend pipe, prevents from drawing
When water sample stir, it is ensured that institute's water sampling is limpid, effectively prevent water quality turbulent flow generation.
(2) a kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the invention, is coordinated using a small amount of part and realized
It is high with simple to operate, efficiency of producing drinking water with manual water-supply method compared with using the function of siphon principle continuous automatically taking water
Advantage；Compared with existing automatically taking water mode again with save energy resource consumption, it is cost-effective, take the benefit such as portable.
(3) a kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the invention, its floating body makes to adopt for the design of spheroid
There is water installations waterline on good stability, floating body to be designed as 50mm with water inlet vertical range, can keep suitable and perseverance
Fixed water intaking depth, makes whole water sampling process stabilization reliable.
(4) a kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the invention, its floating body is hollow ball, in floating body
Top be provided with opening, the opening is sealed by sealing-plug, by opening sealing-plug when using, to floating body inside addition weightening thing
Floating body can be made to sink down into suitable sampling water level, only pass through above-mentioned simple operations, you can realize the function of control water acquisition depth,
It is simple and convenient.
(5) a kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the invention, it introduces stream in water suction component
Adjuster is measured, the water sample rate of outflow can be controlled as needed during water acquisition, it is further to be provided for water quality monitoring work
It is convenient.
(6) a kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the invention, its bend pipe, suction hose and floating body material
It is glass material, has the advantages that durability is strong；It is good that its sealing-plug can ensure that whole device has for the setting of rubber stopper
Sealing.
(7) a kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the invention, simple in construction, manufacturing cost is low, no
Continuous automatically taking water process is only realized, and water intaking depth and water intaking speed can adjust, it is often more important that, fundamentally solve
Determine the turbulent problem of water quality of long-standing problem row professional, be easy in industry promote.
Brief description of the drawings
Fig. 1 is a kind of structural representation of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the present invention.
Label declaration in schematic diagram：
1st, floating body；2nd, suction hose；3rd, bend pipe；4th, the first sebific duct；5th, absorb water ball；6th, the second sebific duct；7th, flow regulator；8、
Sealing-plug.
Embodiment
To further appreciate that present disclosure, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
Embodiment 1
With reference to Fig. 1, a kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the present embodiment, including floating body 1, suction hose
2nd, bend pipe 3 and water suction component.Floating body 1 is glass hollow spheroid, and certain stability, suction hose 2 can be kept by being placed in the sampling water surface
It is glass material with bend pipe 3, has the advantages that durability is strong.Floating body 1, its one end are run through in axis of the suction hose 2 along floating body 1
Connection water suction component, other end bridge piece 3.
Vertical range of the water inlet of bend pipe 3 away from the bottom of bend pipe 3 is 20mm in the present embodiment, and the design is stood using water sample
The characteristics of deposition of solid particle is distributed in sampling apparatus bottom, upper strata water clear afterwards, makes the water inlet of bend pipe 3 and sampling apparatus
Bottom keeps enough distances, and then makes institute's water sampling be the limpid water sample in upper strata.In addition, the water inlet of bend pipe 3 is higher than the bend pipe
Bending section, it is ensured that the opening direction of bend pipe 3 upwards, automatically taking water suction is derived from water inlet top, will not be to sampling cartridge
Bottom set portion produce agitation, be introduced into so as to effectively prevent bottom deposit particle because rising, it is ensured that the limpid water sample in upper strata not by
Interference, so as to thoroughly prevent the turbulent problem of water quality.And prior art is, from protection water inlet angle, to be filtered by setting mostly
The filter plants such as net make water quality reach clarifying effect, it is impossible to prevent the generation of the turbulent problem of water quality, and set filter screen etc. to keep away
That exempts from adds its structural complexity and cleaning cost.Such as the technology for the Patent No. 201210472785.3 that background technology is mentioned
Scheme, although by water sample automatically flow into container make its be not required to extra draw power can complete water intaking, also can be to a certain degree
On avoid water quality turbulent flow generation, but Open Side Down for its water inlet, and water sample, which automatically flows into process, may still introduce deposition solid and outstanding
Floating particles, hidden danger is still had in terms of the turbulent problem of water quality is solved, and the introducing of gas components adds extra cost, no
Beneficial to popularization.
Described bend pipe 3 can set multiple, specific to bend pipe in the present embodiment 3 number be 4,4 bend pipes 3 with
Suction hose 2 is connected, and in order that floating body 1 keeps balance on the sampling water surface, 4 bend pipes 3 are uniformly distributed in the horizontal direction.
Described water suction component includes the first sebific duct 4, the water suction sebific duct 6 of ball 5 and second, and water suction ball 5 both sides connect the respectively
One sebific duct 4 and the second sebific duct 6, the other end of the first sebific duct 4 are connected with suction hose 2, the vertical height of the delivery port of the second sebific duct 6
Degree is less than institute's water sampling liquid level, and the water suction ball 5 is silica gel water suction ball.
Be provided with waterline on the side wall of floating body 1, top is provided with opening, and the opening is sealed by sealing-plug 8, the waterline away from
The vertical range of the water inlet of bend pipe 3 is 50mm.Using the sampling apparatus of the present embodiment, during actual water acquisition, floating body 1 is put
In the water surface to be sampled, sealing-plug 8 is opened, by making the water of the side wall of floating body 1 to the mode such as the internal water flooding of floating body 1 or addition glass marble
Bit line is concordant with sampling liquid level, then stoppers sealing-plug 8, and extruding water suction ball 5, control sample water is flowed into from the water inlet of bend pipe 3,
Flowed out successively through suction hose 2, the first sebific duct 4, the water suction sebific duct 6 of ball 5 and second.The delivery port of second sebific duct 6 in the present embodiment
Vertical height is less than institute's water sampling liquid level, and siphon is started using the suction produced by extruding water suction ball 5, make water sample constant from
Water inlet is flowed into, and is finally flowed out from the second sebific duct 6, participated in and extra draw power without artificial, it is to avoid traditional use suction pipe
Repeatedly water intaking, agitation is produced to water sample, and the problems such as causing water turbidity prevents the generation of water quality turbulent flow from another point of view.
During water acquisition, the waterline of floating body 1 situation not concordant with liquid level is met, sealing-plug 8 can be opened at any time and passes through note
The mode such as water or addition glass marble adjusts the weight of floating body 1, makes the side wall waterline of floating body 1 concordant with sampling liquid level, it is ensured that device
Constant draft is maintained, makes water sampling process stabilization reliable；And utilization opens the water filling of sealing-plug 8 or adds glass marble
Mode adjusts the weight of floating body 1, simple and convenient.In addition, to ensure that whole device has good sealing, sealing-plug 8
It is set to rubber stopper.
Embodiment 2
A kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the present embodiment, basic be the same as Example 1, its difference
It is：Vertical range of the water inlet of bend pipe 3 away from the bottom of bend pipe 3 is 18mm in the present embodiment.
Embodiment 3
A kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the present embodiment, basic be the same as Example 1, its difference
It is：Flow regulator 7 is provided with the second sebific duct 6 in the present embodiment, aqueous sample stream can be controlled as needed during water acquisition
Go out speed, be that water quality monitoring provides more convenience.
Embodiment 4
A kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the present embodiment, basic be the same as Example 1, its difference
It is：Main scale mark 1 and 2 is set in its side wall waterline upper-lower position of floating body 1, main scale mark 1 is vertical away from the water inlet of bend pipe 3
Distance is 20mm, and vertical range of the main scale mark 2 away from the water inlet of bend pipe 3 is 80mm, in main scale mark 1 and waterline, master calibration
Each 10 equidistant secondary graduation marks of setting are distinguished between line 2 and waterline.The setting except ensure draft be maintained 50mm it
Outside, draft that can also as needed in the range of flexible modulation 20mm-80mm, and for draft degree of regulation more
It is high.
Embodiment 5
A kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the present embodiment, basic be the same as Example 1, its difference
It is：Bend pipe 3 is provided with 2 in the present embodiment, and 2 bend pipes 3 are axisymmetricly set in the horizontal direction, and the water inlet of bend pipe 3 is away from curved
The vertical range of the bottom of pipe 3 is 19mm.
Embodiment 6
A kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow of the present embodiment, basic be the same as Example 1, its difference
It is：Bend pipe 3 is provided with 6 in the present embodiment, and 6 bend pipes 3 are uniformly distributed in the horizontal direction.
A kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow and the method for sampling described in embodiment 1-6, it is simple in construction,
Manufacturing cost is low, not only realizes continuous automatically taking water process, and water intaking depth and water intaking speed can adjust, prior
It is the turbulent problem of water quality for fundamentally solving long-standing problem row professional, is easy in industry promote.
Schematical above that the present invention and embodiments thereof are described, the description does not have restricted, institute in accompanying drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited thereto.So, if the common skill of this area
Art personnel are enlightened by it, without departing from the spirit of the invention, are designed and the technical scheme without creative
Similar frame mode and embodiment, all should belong to protection scope of the present invention.
Claims (10)
1. a kind of portable anti-adjustable deep siphon sampling apparatus of turbulent flow, it is characterised in that：Including floating body (1), suction hose (2), curved
(3) and water suction component are managed, described suction hose (2) runs through floating body (1), one end connection water suction component of the suction hose (2), water suction
The other end bridge piece (3) of (2) is managed, the water inlet of described bend pipe (3) is higher than the bending section of the bend pipe (3).
2. the portable anti-adjustable deep siphon sampling apparatus of turbulent flow of one kind according to claim 1, it is characterised in that：Described
Vertical range of bend pipe (3) water inlet away from bend pipe (3) bottom is 18mm~20mm.
3. the portable anti-adjustable deep siphon sampling apparatus of turbulent flow of one kind according to claim 1 or 2, it is characterised in that：Institute
Waterline is provided with floating body (1) side wall stated, vertical range of the waterline away from bend pipe (3) water inlet is 50mm.
4. the portable anti-adjustable deep siphon sampling apparatus of turbulent flow of one kind according to claim 3, it is characterised in that：Described
The component that absorbs water includes the first sebific duct (4), water suction ball (5) and the second sebific duct (6), and water suction ball (5) both sides connect the first sebific duct respectively
(4) and the second sebific duct (6), the other end of the first sebific duct (4) is connected with suction hose (2).
5. the portable anti-adjustable deep siphon sampling apparatus of turbulent flow of one kind according to claim 4, it is characterised in that：Described
Flow regulator (7) is provided with second sebific duct (6), the vertical height of the delivery port of second sebific duct (6) is less than institute's water sampling
Liquid level.
6. the portable anti-adjustable deep siphon sampling apparatus of turbulent flow of one kind according to claim 5, it is characterised in that：Described
Bend pipe (3) is provided with 2-6, and 2-6 bend pipe (3) connects with suction hose (2), and 2-6 bend pipe (3) is uniform in the horizontal direction
Distribution.
7. the portable anti-adjustable deep siphon sampling apparatus of turbulent flow of one kind according to claim 3, it is characterised in that：Described
Floating body (1) is to be provided with opening above hollow ball, the floating body (1), and the opening is sealed by sealing-plug (8).
8. the portable anti-adjustable deep siphon sampling apparatus of turbulent flow of one kind according to claim 7, it is characterised in that：Described
Suction hose (2) is straight tube, and floating body (1) is run through in the axis of the suction hose (2) along floating body (1).
9. the portable anti-adjustable deep siphon sampling apparatus of turbulent flow of one kind according to claim 8, it is characterised in that：Described
Floating body (1) and suction hose (2) are glass material；Described water suction ball (5) is silica gel water suction ball；Described sealing-plug (8) is rubber
Plug.
10. a kind of portable anti-adjustable deep siphon method of sampling of turbulent flow, it is characterised in that：Floating body (1) is placed in the water surface to be sampled,
By to addition weightening thing inside floating body (1), making waterline on floating body (1) concordant with liquid level, then extruding water suction ball (5), control
Sample water processed is flowed into from bend pipe (3) water inlet, successively through suction hose (2), the first sebific duct (4), water suction ball (5) and the second sebific duct
(6) flow out, while adjusting water sample flow by flow regulator (7).
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| CN109115554A (en) * | 2018-09-21 | 2019-01-01 | 金鑫来 | River sewage sampler |
| CN109115554B (en) * | 2018-09-21 | 2020-11-20 | 义乌市佳倩科技有限公司 | River sewage sampler |
| CN109708921A (en) * | 2019-02-28 | 2019-05-03 | 栾东存 | A kind of portable boiler water quality sampler |
| CN117136917A (en) * | 2023-08-29 | 2023-12-01 | 青岛海洋地质研究所 | Multitube siphon biological sampling device based on underwater vehicle |
| CN117136917B (en) * | 2023-08-29 | 2024-04-05 | 青岛海洋地质研究所 | Multitube siphon biological sampling device based on underwater vehicle |
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