CN110285246A - A kind of constant device of reed-type adaptive flow - Google Patents
A kind of constant device of reed-type adaptive flow Download PDFInfo
- Publication number
- CN110285246A CN110285246A CN201910675315.9A CN201910675315A CN110285246A CN 110285246 A CN110285246 A CN 110285246A CN 201910675315 A CN201910675315 A CN 201910675315A CN 110285246 A CN110285246 A CN 110285246A
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- China
- Prior art keywords
- flow
- reed
- combined type
- spring assembly
- inner cavity
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- 230000003044 adaptive effect Effects 0.000 title claims abstract description 16
- 239000012530 fluid Substances 0.000 claims abstract description 38
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 29
- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 25
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000009987 spinning Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000013535 sea water Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010612 desalination reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- WAIPAZQMEIHHTJ-UHFFFAOYSA-N [Cr].[Co] Chemical compound [Cr].[Co] WAIPAZQMEIHHTJ-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
Classifications
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/34—Excess-flow valves in which the flow-energy of the flowing medium actuates the closing mechanism
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The present invention is a kind of constant device of reed-type adaptive flow, it is characterized by: the constant device of the flow includes the shell equipped with inner cavity reducer, sequence is set to the circlip at the inner cavity reducer in shell middle section, adjust ring, combined type spring assembly and circular arc taper answer flow table, the combined type spring assembly is superimposed with one heart by two groups of reed groups and is riveted, the inner cavity reducer is to be set to the diameter of shell middle section and its big end and the bellmouth for answering flow table size to match of combined type spring assembly and circular arc taper, described answers flow table to match the gap passage for constituting fluid with combined type spring assembly, the side of the shell setting circlip is fluid upstream end, the shell is respectively equipped with thread segment in the two sides of inner cavity reducer, for the connection with fluid delivery pipeline.The configuration of the present invention is simple is not necessarily to manual intervention, the stability contorting of realization flow that can be adaptive.
Description
Technical field
The present invention relates to a kind of constant flow devices for fluid conveying, especially disclose a kind of reed-type adaptive flow
Constant device is applied in the place for having constant requirement to flow, is particularly suitable in seawater desalination system, is adaptively realized and is maintained
The stability of flow.
Background technique
It is constant to the flow of fluid to have extensive demand in industrial production and manufacturing, for example, the seawater such as board-like fresh water generator
The water yield of desalting plant just needs an opposite stationary value, and the overall co-ordination of all parts is needed in desalination process, stream
The unstable specified production capacity for meaning to be difficult to realize equipment is measured, or even is unable to reach the specified production capacity of equipment, this necessity of making use of momentum is asked
The rate of water make-up of raw material seawater is constant.
Widespread practice is that installation hand stop valve is adjusted at random at present, because of the sea that the product of this sizing is equipped with
Water pump different user is because of suction height, suction inlet duct length, outlet conduit length, elbow quantity, the resistance of ducting, in addition voltage
Stability, many factors such as draft amount of ship, so that the flow of sea water pump water outlet is multifarious, pressure changes often.In order to
Adjustment flow reaches stable or constant requirement, can only adjust flow by controlling opening of valve, and pressure is high suitably to be turned down
Valve, pressure is low suitably to open big valve.It is this that valve is manually operated by the indicated value of observation pressure gauge and flowmeter, it adjusts
On the one hand the method for flow is adjusted not in time, is on the other hand adjusted not in place.It is light then cause water yield unstable, it is heavy then because mending
Water is less, water temperature over-high, easily causes titanium plate incrustation, and irreversible water-yielding capacity is caused to decline.
For similar problems, in recent years, some equipment manufacturers both domestic and external carry out on flow is constant and valve improves
Research and development.But from industry market, product exhibition and relevant report, it is able to achieve the flow control valve one that certain precision is adjusted
As all structure is complicated, and not only degree of regulation is poor for the simple flow control valve of structure, and usually or needs manually to be adjusted
, there is not new breakthrough in the research of flow automatic constant in section control.Meanwhile it can automate and carry out flow constant control
System is typically necessary cooperation electronic component, and manufacturing cost and maintenance cost are all high, and bigger due to needing
Installation space and use condition, the application on the Related product for being related to fluid conveying are extremely restricted.
Summary of the invention
Present invention aim to address the defects of the prior art, design a kind of constant device of reed-type adaptive flow, are not necessarily to
Artificial interference can adaptively maintain stable flow in fluid delivery process, solve manual adjustment valve not in time,
The problem of flow inaccuracy, moreover it is possible to save the high cost that the prior art needs to be equipped with the generation of flow fits automatically control system.
The present invention is implemented as follows: a kind of constant device of reed-type adaptive flow, it is characterised in that: the flow is permanent
Determine device include equipped with inner cavity reducer shell, sequentially set on shell middle section inner cavity reducer at circlip, adjust ring,
Combined type spring assembly and circular arc taper answer flow table, and the taper of the bellmouth of the inner cavity reducer is 135 °.Described
Combined type spring assembly is superimposed with one heart by two groups of reed groups and is riveted, the inner cavity reducer be set to shell middle section and
The bellmouth for answering flow table size to match of the diameter of its big end and combined type spring assembly and circular arc taper, the circular arc
Taper answers the tapered direction of flow table consistent with the bellmouth direction of inner cavity reducer, and the combined type spring assembly is via tune
It saves ring to be excessively set to by circlip afterwards at the position of inner cavity reducer big end of shell, circumscribed circular diameter is less than in shell
The outside diameter of chamber reducer, described answers flow table to match the gap passage for constituting fluid with combined type spring assembly, described
The side that circlip is arranged in shell is fluid upstream end, and circlip is connected in the big end of inner cavity reducer, with shell close-fitting
It closes, the shell is respectively equipped with thread segment in the two sides of inner cavity reducer, for the connection with fluid delivery pipeline.Described
It is internal thread segment that shell, which is used for the thread segment that connect with fluid delivery pipeline in inner cavity reducer two sides, directly and transfer pipeline
It is threadedly coupled, or is set as external thread section, the constant device spinning of several flows forms combined type in the plane of same flanged plate
The constant device of flow.
The combined type spring assembly is superimposed with one heart by two groups of quadrangle star reed groups and is riveted, and adjacent two corners
Angular bisector is mutually at 45 °, faces in octagonal starriness, is riveted using tubular rivet, the combined type spring assembly after combination installation
Be centrally formed through-hole, four angle alignment of quadrangle star reed that the quadrangle star reed group is equal by several size thickness
It is formed by stacking, the quadrangle star reed quantity of superposition is 2~8, and four angles of the quadrangle star reed are uniformly distributed along the circumference, shape
At the quadrangle starriness of equal part, quadrangle star reed section is arc, the spherical shape of surface curvature.
The flow table central part of answering of the circular arc taper is through-hole, and periphery is the disk of arc groove shape waist, arc groove
Shape waist is to be recessed to combined type spring assembly side, the gap passage for answering flow table to match composition with combined type spring assembly
Variation of the size in the combined type spring assembly due to change in fluid pressure and when deformation occurs also.The flow is permanent
Determine device and is suitable for the flow pressure-difference variation that 0.2~1.3MPa range includes endpoints thereof.
Present invention employs the designs of quadrangle star elastic spring combined type superposition, and the circular arc for answering flow table to be designed as is bored
Shape plate-like, the two match the flow area Throttle Principle to be inversely proportional with pressure and carry out constant current, warp to the fluid for flowing through pipeline
Shell is fixed and is adjusted to the position for adjusting ring, and make octagonal star-shaped combined type spring assembly and circular arc taper answers flow table always
In suspended state, only under this suspended state, the gap passage of fluid could be automatically according to the variation of pressure or pressure difference
Be adjusted, promptly respond and adjust, always can offset pressure or pressure difference variation influence, make the stream in fluid circuit
Amount keeps constant value.Constant current gap passage of the present invention design rationally, is capable of the rapid fluctuations of compensator or trimmer pressure or pressure difference, to fluid stream
The influence of fast instantaneous value, so that each instantaneous flow and average flow rate are close.The present invention integrally uses high-performance strong-corrosion-resistant
Alloy material is made, and in fluid delivery process, the stability contorting of realization flow that can be adaptive is constant applied to having to flow
It is required that place, can solve manual adjustment valve not in time, the problem of flow inaccuracy.
There is the fluid of constant requirement defeated flow the beneficial effects of the present invention are: the present invention is mounted in fluid delivery system
It send on pipeline, is designed using the strain throttle structure formed as two groups of reed groups combined type spring assembly made of cross-superimposed,
The stability contorting to flow that can adaptively realize guarantees the constant of flow in fluid delivery process, without electrically driven
With automation control element, without human intervention.The present invention realizes the automatic adjustment of runner gap and perseverance by mechanical control method
The suspension for flowing component changes, and influence of the automotive resistance pressure difference to flow, flow no longer changes with pressure or pressure difference, overcomes stream
The technical problems such as degree of regulation are measured, parts processing technology and assembly precision requirement is reduced, reduces mechanical wear and operation
Resistance improves flow accuracy and service life, meets product seriation demand.The present invention is not necessarily to electrical control, mechanical structure
Simply, high reliablity, operating cost is low, and the investment and operation maintenance expense of flow automatic constant device is greatly saved.
Detailed description of the invention
Fig. 1 is the constant device positive structure diagram of inventive flow.
Fig. 2 is the constant device schematic cross-sectional view of inventive flow.
Fig. 3 is the sectional structure enlarged drawing in Fig. 2 at combined type spring assembly.
Fig. 4 is combined type spring assembly positive structure diagram of the invention.
Fig. 5 is the cross-sectional side structural schematic diagram of Fig. 4.
In figure: 1, shell；2, circlip；3, ring is adjusted；4, combined type spring assembly；5, Ying Liupan；6, quadrangle
Star reed group.
Specific embodiment
With reference to the accompanying drawings 1~5, the present invention is a kind of constant device of reed-type adaptive flow, including being equipped with inner cavity reducer
Shell 1, the circlip 2 sequentially at the inner cavity reducer in 1 middle section of shell adjust ring 3, combined type spring assembly 4 and circle
Arc taper answers flow table 5.The inner cavity reducer is the diameter and combined type spring for being set to 1 middle section of shell and its big end
The bellmouth for answering 5 size of flow table to match of piece component 4 and circular arc taper, the tapered direction for answering flow table 5 of the circular arc taper
It is consistent with the bellmouth direction of inner cavity reducer.The combined type spring assembly 4 is excessively rear by elasticity gear via ring 3 is adjusted
Circle 2 is set at the position of the inner cavity reducer big end of shell 1, and the big end that circumscribed circular diameter is less than 1 inner cavity reducer of shell is straight
Diameter combined type spring assembly 4 and answers flow table 5 respectively in suspended state in normal fluid transportation work.The shell 1 is arranged
The side of circlip 2 is fluid upstream end, and circlip 2 is connected in the big end of inner cavity reducer, with 1 tight fit of shell, institute
The taper for stating the bellmouth of inner cavity reducer is 135 °.
With reference to the accompanying drawings 2, the shell 1 is respectively equipped with thread segment in the two sides of inner cavity reducer, is used for and fluid conveying
The connection of pipeline, can be set to internal thread segment, be connected directly between on transfer pipeline, can be configured as external thread section, according to reality
Border is using needs, by the constant device spinning of several flows in the plane of a flanged plate, forms the combined type of big flow, more specifications
The constant device of flow is generally advisable using 2~8.
With reference to the accompanying drawings 1~5, the combined type spring assembly 4 by two groups of quadrangle star reed groups 6 with one heart superposition riveting and
At, and the angular bisector of adjacent two corners is mutually at 45 °, faces in octagonal starriness, is riveted using tubular rivet, after combination installation
The center of combined type spring assembly 4 has through-hole, and the through-hole diameter can be designed to different big according to the applicable requirements of flow
It is small, the impact force of compensator or trimmer pressure or pressure difference mutation, and the effect of secondary channels.Described quadrangle star reed 6 several sizes of group
Four angle alignment of quadrangle star reed being equal with thickness is formed by stacking, and the quadrangle star reed quantity of superposition is generally 2~8
Part is specifically determined by the flow value of required control.Reed uses Hastelloy C alloys 276 or titanium alloy TC 4, to the spy of elastic material
It is different to require to be that there is excellent corrosion resistance, it can be applicable in for a long time in the place of seawater or extensive chemical medium.The quadrangle star
Four angles of reed are uniformly distributed along the circumference, and form the quadrangle starriness of equal part, to increase the distribution area of runner, also can be improved pair
The reaction sensitivity of the fluid of process and the accuracy of flow control.Quadrangle star reed section is arc, and surface curvature is in ball
Planar, spherical radius is in 50~200mm, to slow down pressure and fluid impact, improves octagonal star-shaped combined type spring assembly 4
Suppleness, effectively slow down influence of the pressure jump to flow, reduce flowed fluctuation.
With reference to the accompanying drawings 2 and attached drawing 3,5 central part of flow table of answering of the circular arc taper is through-hole, and periphery is arc groove shape waist
Disk, arc groove shape waist is to be recessed to 4 side of combined type spring assembly, and Ying Liupan 5 matches with combined type spring assembly 4
Constitute the gap passage of fluid, i.e. constant current gap passage.When fluid flows through the constant device of inventive flow, combined type spring assembly
4 due to change in fluid pressure and deformation occurs, it is logical that the corresponding gap passage also follows the variation of pressure to automatically adjust gap
The size in road realizes the constant technical requirements of the flow of fluid in conveyance conduit.
The working principle of the invention: when fluid flows through the constant device of inventive flow, and pressure difference is within the scope of 0.2~1.3MPa
When (including endpoints thereof), with the raising of pressure difference, the deformation of combined type spring assembly 4 increases, and makes combined type spring assembly 4 and should flow
Gap passage between disk 5 reduces, conversely, the deformation of combined type spring assembly 4 reduces with the reduction of pressure difference, makes combined type spring
Piece component 4 and the gap passage between flow table 5 is answered to increase, influence of the pressure difference to flow is counteracted, by the fluid stream of constant device
Amount remains unchanged.
The present invention is installed on fluid delivery tube road, and the design of constant current gap passage rationally, is capable of compensator or trimmer pressure or pressure difference
Rapid fluctuations, the influence of fluid flow rate instantaneous value, so that each instantaneous flow and average flow rate are close, the adaptive reality of energy
The stability contorting of existing flow, applied to the place for having constant requirement to flow, can solve manual adjustment valve not in time, flow
The problem of inaccuracy.
Claims (6)
1. a kind of constant device of reed-type adaptive flow, it is characterised in that: the constant device of the flow includes being equipped with inner cavity variable diameter
The shell of section, adjusts ring, combined type spring assembly and circular arc at the circlip sequentially at the inner cavity reducer in shell middle section
Taper answers flow table, and the combined type spring assembly is superimposed with one heart by two groups of reed groups and is riveted, the inner cavity variable diameter
Section answers flow table size phase for be set to the diameter of shell middle section and its big end and combined type spring assembly and circular arc taper
The bellmouth of cooperation, the circular arc taper answers the tapered direction of flow table consistent with the bellmouth direction of inner cavity reducer, described
Combined type spring assembly via adjust ring excessively afterwards by circlip be set to shell inner cavity reducer big end position at,
Its circumscribed circular diameter is less than the outside diameter of housing cavity reducer, and described answers flow table to match structure with combined type spring assembly
At the gap passage of fluid, the side of the shell setting circlip is fluid upstream end, and circlip is connected in inner cavity change
The big end of diameter section, with shell tight fit, the shell is respectively equipped with thread segment in the two sides of inner cavity reducer, is used for and fluid
The connection of transfer pipeline.
2. a kind of constant device of reed-type adaptive flow according to claim 1, it is characterised in that: the combined type
Spring assembly is superimposed with one heart by two groups of quadrangle star reed groups and is riveted, and the angular bisector of adjacent two corners is mutually at 45 °, faces
It in octagonal starriness, is riveted using tubular rivet, combines the through-hole that is centrally formed of the combined type spring assembly after installing, it is described
Four angle alignment of quadrangle star reed that quadrangle star reed group is equal by several size thickness is formed by stacking, the quadrangle star of superposition
Shape reed quantity is 2~8, and four angles of the quadrangle star reed are uniformly distributed along the circumference, and forms the quadrangle starriness of equal part, four
Angle star reed section is arc, the spherical shape of surface curvature.
3. a kind of constant device of reed-type adaptive flow according to claim 1, it is characterised in that: the circular arc cone
The flow table central part of answering of shape is through-hole, and periphery is the disk of arc groove shape waist, and arc groove shape waist is to combined type reed group
Part side recess, the size of the gap passage for answering flow table to match composition with combined type spring assembly is in the combined type
Variation of the spring assembly due to change in fluid pressure and when deformation occurs also.
4. a kind of constant device of reed-type adaptive flow according to claim 1, it is characterised in that: the inner cavity becomes
The taper of the bellmouth of diameter section is 135 °.
5. a kind of constant device of reed-type adaptive flow, feature described according to claim 1~any one of 4 exist
In: the shell of the constant device of flow is interior spiral shell in the thread segment that inner cavity reducer two sides are used to connect with fluid delivery pipeline
Line section, is directly threadedly coupled with transfer pipeline, or is set as external thread section, and the constant device spinning of several flows is in same flanged plate
Plane in, formed the constant device of combined type flow.
6. a kind of constant device of reed-type adaptive flow, feature described according to claim 1~any one of 4 exist
In: the constant device of the flow adapts to the flow pressure-difference variation that 0.2~1.3MPa range includes endpoints thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910675315.9A CN110285246A (en) | 2019-07-25 | 2019-07-25 | A kind of constant device of reed-type adaptive flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910675315.9A CN110285246A (en) | 2019-07-25 | 2019-07-25 | A kind of constant device of reed-type adaptive flow |
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| Publication Number | Publication Date |
|---|---|
| CN110285246A true CN110285246A (en) | 2019-09-27 |
Family
ID=68022503
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910675315.9A Pending CN110285246A (en) | 2019-07-25 | 2019-07-25 | A kind of constant device of reed-type adaptive flow |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819284A (en) * | 2021-08-20 | 2021-12-21 | 中航光电科技股份有限公司 | Flow balance valve |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1175761A (en) * | 1966-03-18 | 1969-12-23 | Danfoss As | Volume Flow Regulator for Fluids |
| CN101861555A (en) * | 2007-11-15 | 2010-10-13 | 贝利莫控股公司 | Flow restrictor |
| CN201909076U (en) * | 2010-11-02 | 2011-07-27 | 尼亚加拉节能产品(厦门)有限公司 | Novel flow controller |
| CN106462169A (en) * | 2014-04-30 | 2017-02-22 | 纽珀有限公司 | Flow control valve |
| CN107621832A (en) * | 2017-09-11 | 2018-01-23 | 东南大学 | Syringe flow stabilization apparatus |
| CN210240697U (en) * | 2019-07-25 | 2020-04-03 | 汉盛（上海）海洋装备技术股份有限公司 | Reed type self-adaptive flow constant device |
-
2019
- 2019-07-25 CN CN201910675315.9A patent/CN110285246A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1175761A (en) * | 1966-03-18 | 1969-12-23 | Danfoss As | Volume Flow Regulator for Fluids |
| CN101861555A (en) * | 2007-11-15 | 2010-10-13 | 贝利莫控股公司 | Flow restrictor |
| CN201909076U (en) * | 2010-11-02 | 2011-07-27 | 尼亚加拉节能产品(厦门)有限公司 | Novel flow controller |
| CN106462169A (en) * | 2014-04-30 | 2017-02-22 | 纽珀有限公司 | Flow control valve |
| CN107621832A (en) * | 2017-09-11 | 2018-01-23 | 东南大学 | Syringe flow stabilization apparatus |
| CN210240697U (en) * | 2019-07-25 | 2020-04-03 | 汉盛（上海）海洋装备技术股份有限公司 | Reed type self-adaptive flow constant device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113819284A (en) * | 2021-08-20 | 2021-12-21 | 中航光电科技股份有限公司 | Flow balance valve |
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