CN108679298A - A kind of labyrinth disc for labyrinth adjusting valve - Google Patents
A kind of labyrinth disc for labyrinth adjusting valve Download PDFInfo
- Publication number
- CN108679298A CN108679298A CN201810614645.2A CN201810614645A CN108679298A CN 108679298 A CN108679298 A CN 108679298A CN 201810614645 A CN201810614645 A CN 201810614645A CN 108679298 A CN108679298 A CN 108679298A
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- Prior art keywords
- labyrinth
- section
- runner
- disc
- entrance
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses a kind of labyrinth discs for labyrinth adjusting valve, labyrinth disc is equipped at least one labyrinth passage, labyrinth passage includes interconnected entrance, interlude and outlet section, and wherein entrance is located at the entrance of labyrinth passage, including a plurality of runner being arranged in parallel；Outlet section is located at the outlet of labyrinth passage, including a plurality of runner being arranged in parallel；Interlude is between entrance and outlet section, including multiple bending sections, forms multilevel decompression structure.
Description
Technical field
The present invention relates to machinery fields, more particularly to the labyrinth disc for labyrinth adjusting valve being steadily depressured.
Background technology
During modern industrial production, the regulating valve to work under the conditions of High Pressure Difference is due to its internal fluid occurred
The problems such as flow velocity is excessively high, vibration noise and cavitation erosion, causes regulating valve that can not need to realize due regulatory function according to system,
And then lead to entire pipeline control system working performance reduction, reduced service life, vibration and noise aggravation, it causes to pacify
Full hidden danger has adverse effect on the efficient stable operation of industrial processes, and basic reason is since regulating valve is run
Caused by operating mode pressure difference is excessively high.To conventional regulating valve, when throttling process pressure difference is very big, pressure when fluid enters throttle point
It can decline suddenly.For gas medium, pressure decline can cause flow velocity to steeply rise, and the erosion of high flow rate gas with it is strong
Pressure oscillation can generate destruction to components such as valve body and spools, while cause the harm such as vibration, noise.For liquid medium, pressure
When power is less than medium temperature corresponding hold-up vapour pressure Pv, partially liq will vaporize to form a large amount of small steam bubbles, when
Pressure, which is gone up again to bubble caused by before when Pv or more, just to crumble and fall, to be damaged to valve, i.e. cavitation.
Above-mentioned a series of problems, counter-measure caused by regulating valve under the conditions of running on High Pressure Difference is directed at present mainly to adopt
Use two methods.One is consider from valve material, i.e., by heat treatment, built-up welding, surfacing Si Tailai alloys, chemosmosis or
The treatment measures such as ceramic spraying carry out Surface hardened layer to throttling element, to make to form hardened surface at fluid scouring, keep high
Hardness and strength, but valve industry still fails to find a kind of material that can be suitable for high-differential-pressure regulating valve for a long time so far,
So can only be damaged caused by delaying cavitation and high flow rate by the method for improving material hardness to promote adjusting valve performance, from
And extend the service life of valve, it can not fundamentally solve the problems, such as this；The second is being examined from valve internal throttle structure
Consider, i.e., inner spool is improved on the basis of traditional regulation valve, when fluid being made to enter regulating valve internal orifice, fluid
Energy constantly consumes, and velocity of medium is limited, and pressure medium continuously decreases, to which multilevel decompression regulating valve product comes into being,
Effectively reduce the generation of the harm such as cavitation erosion and vibration noise.
The pressure x velocity of the labyrinth regulating valve throttling process of the prior art, as shown in Figure 1.For the regulating valve of labyrinth,
In high pressure drop, fluid stream causes cavitation erosion below pressure drop to saturated vapor pressure after throttling element to valve, and
Multilevel decompression structure makes fluid maintain stable pressure reduction inside regulating valve.The labyrinth regulating valve multistage drop of the prior art
Press throttling process pressure x velocity as shown in Fig. 2, the prior art High Pressure Difference labyrinth regulating valve, have maximum duty, nominal situation
With three kinds of operating modes of minimum operating mode, maximum duty and nominal situation have unsaturated condensed water single-phase flow, Cavitation flows stream and gas-liquid again
Three kinds of fluid mobility status of two phase flow, minimum operating mode have two kinds of fluid mobility status of unsaturated condensed water single-phase flow and Cavitation flows.
In unsaturated condensed water single-phase flow, velocity of medium is relatively low, and valve internal pressure be not less than hold-up vapour pressure when
There is no the generation of cavitation, it is very small to the extent of the destruction of valve；In the case of biphase gas and liquid flow, multilevel decompression structure is effective
The drastically mutation for inhibiting velocity of medium makes the increase of flow velocity control within the range of permission, so as to avoid throttling process
In the destruction that valve and place piping is brought due to high flow rate and strong pressure oscillation；And in Cavitation flows, due to
The bubble that cavitation generates makes the potential energy stored by its own be transformed into the kinetic energy of fluid in smaller size smaller when crumbling and fall, and makes in fluid
Fluid impact wave is formed, when this shock wave passes to the flow passage components in fluid, flow passage components surface can be made to generate stress arteries and veins
The local plastic deformation of punching and pulsed, or even processing hardening is generated, valve is caused largely to destroy, i.e. cavitation erosion is broken
It is bad.Therefore, the cavitation-preventive design of spool multilevel decompression structure is most important, directly influences the service life and place pipe of valve
The safe operation of system.
The labyrinth disc structure chart of the labyrinth regulating valve of the prior art, as shown in figure 3, flowing through single runner for Study of Fluid
When its internal decompression situation, the single runner model of labyrinth disc is established according to the figure, as shown in figure 4, using fluid dynamic
It learns analysis software CFX and one-way flow flow field analysis is carried out to maximum duty unsaturation condensed water.As shown in figure 5, single fluid flow on channel
It is 0.1335kg/s that simulation, which obtains rate of discharge, then the total flow of single labyrinth disc is 0.1335 × 8=1.068kg/s, is read
Take single runner per the pressure on level-one center line, the relationship for drawing out the decompression series and pressure change on single runner is bent
Line, as shown in Figure 6.As described in Figure 6, when medium is by every grade of disc of original structure, pressure can uniformly decline substantially, but last
Stage pressure reduction is larger, can not steadily decline, cavitation easily occur during valve working, and in the 8th section or so pressure
Restore more serious.To ensure that pressure is slowly decreased step by step, largely pressure recovery is avoided, increases life of valve, carries
The prioritization scheme reduced at a slow speed after having gone out to make valve internal pressure first quickly to reduce, optimization need to reach as shown in curve in Fig. 6
Ideal effect.
Invention content
In view of the above technical problems, the present invention provides a kind of labyrinth disc for labyrinth adjusting valve, the labyrinths
Disc is equipped at least one labyrinth passage, and the labyrinth passage includes multiple bending sections, forms multilevel decompression structure, more
Grade buck configuration makes fluid maintain stable pressure reduction inside regulating valve, it is therefore prevented that the generation of cavitation erosion, and it is effective anti-
Only velocity of medium generation is drastically mutated, and the increase of flow velocity is made to control within the range of permission, so as to avoid in throttling process
The harmful effects such as cavitation erosion, noise, the vibration brought to valve and place piping due to high flow rate and strong pressure oscillation, are helped
In ensuring working performance of regulating valve under the conditions of High Pressure Difference, extend the service life of regulating valve.
Further, labyrinth passage of the invention includes entrance, interlude and outlet section, and wherein entrance is located at fan
The entrance in palace formula channel, including a plurality of runner being arranged in parallel；Outlet section is located at the outlet of labyrinth passage, including a plurality of parallel connection
The runner of setting；Interlude between entrance and outlet section, be connected to entrance and outlet section.
Further, the entrance of labyrinth passage of the invention includes at least 3 runners being set up in parallel, and is preferably included
4 or 5 runners being set up in parallel.
Further, the runner of labyrinth passage interlude of the invention includes multiple bending sections, forms multilevel decompression knot
Structure makes the pressure reduction of fluid held stationary inside regulating valve.
Further, labyrinth passage interlude of the invention includes at least one flow channel section in parallel, the parallel connection runner
Section includes a plurality of runner being arranged in parallel, and preferred includes two runners being arranged in parallel.Preferably, labyrinth type of the invention is logical
Road interlude includes a flow channel section in parallel, and the parallel connection flow channel section includes two runners being arranged in parallel.It is further described
Runner before and after flow channel section in parallel includes at least one bending section.
Further, the outlet section of labyrinth passage of the invention includes a plurality of runner being arranged in parallel, and is preferably included simultaneously
Join two runners of setting, it is preferred that every runner includes at least one bending section, preferably includes 7 or 8 bending sections.
Runner of the present invention may include being interconnected and flow channel section at an angle to each other, adjacent flow channel section form bending
Portion, it is preferred that the bending angle of the bending section is 90 °.The cross-sectional area of each flow channel section is according to labyrinth disc in the present invention
Size and series determine
Preferably, labyrinth disc of the invention is equipped with 10 or 11 labyrinth passages.
In another aspect of the present invention, a kind of labyrinth adjusting valve of the labyrinth disc comprising the present invention is provided.
The labyrinth disc and regulating valve of the present invention solves in the prior art that the pressure reduction of valve afterbody is larger, cannot
It is enough steady to decline, cavitation and pressure recovery serious problem easily occur during valve working, flow can met
It is reduced at a slow speed after under the premise of it is required that valve internal pressure can first quickly reduced, ensures that pressure is slowly decreased step by step, keep away
Exempt from largely pressure recovery, increases life of valve.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
With obtain other attached drawings according to these attached drawings.
Fig. 1 is prior art throttling process pressure x velocity figure；
Fig. 2 is prior art labyrinth regulating valve multilevel decompression throttling process pressure x velocity figure；
Fig. 3 is prior art labyrinth disc entirety runner structural schematic diagram；
Fig. 4 is prior art labyrinth disc flow passage structure schematic diagram；
Fig. 5 is prior art labyrinth disc flowpath pressure cloud atlas；
Fig. 6 is the single runner decompression series of prior art palace disc and pressue-graph；
Fig. 7 is arbitrary concatenated 3 segment structure schematic diagram on the single runner of prior art labyrinth disc；
Fig. 8 is a kind of labyrinth disc flow passage structure schematic diagram of 4 liquid-in pipes of the embodiment of the present invention；
Fig. 9 is a kind of labyrinth disc flow passage structure schematic diagram of 5 liquid-in pipes of the embodiment of the present invention；
Figure 10 is that the labyrinth disc structure that a kind of labyrinth disc runner by 5 liquid-in pipes of the embodiment of the present invention forms is shown
It is intended to；
Figure 11 is the labyrinth disc pressure cloud atlas of the labyrinth disc runner composition of 5 liquid-in pipes of the embodiment of the present invention；
Figure 12 is the labyrinth disc decompression hop count and pressure of the labyrinth disc runner composition of 5 liquid-in pipes of the embodiment of the present invention
Force curve figure.
Specific implementation mode
The technique effect of the design of the present invention, concrete structure and generation is described further below with reference to attached drawing, with
It is fully understood from the purpose of the present invention, feature and effect.
Labyrinth type regulating valve runner form is varied, but it is relatively fewer to be specifically laid out theory deduction for its runner,
In order to design the anti-cavitation structure of spool, now with simplest labyrinth disc that there is turning, being horizontally arranged shown in Fig. 7
Derivation explanation is carried out when single series connection runner single-phase flow.
As shown in Figure 7, pi(i=1,2,3n) is the single upper pressure lowest point section pair of i-th section of series connection runner
The pressure medium answered；viFor with piMedium mean flow rate, α at corresponding sectioniFor with viCorresponding kinetic energy correction factor, value
Perseverance is more than 1, under the conditions of industrial pipeline runner, αi=1.01--1.10；AiFor with piCorresponding area of section；Li1Individually to go here and there
Join the upper corresponding leading portion flow channel length in minimum pressure section of i-th section of runner, Li2Individually to connect, the upper minimum pressure of i-th section of runner is cut
The corresponding back segment flow channel length in face；Di1For with Li1The equivalent diameter of corresponding leading portion runner, Di2For with Li2Corresponding back segment runner
Equivalent diameter；λi1For with Li1Corresponding leading portion runner loss factor, λi2For with Li2Corresponding back segment runner linear loss
Coefficient.
The continuity equation of single series connection each section of fluid of runner：
Each section of minimum pressure section of single series connection runner average basis weight viscous incompressible fluid is corresponding to entrance
Bernoulli equation：
···
It can be obtained by (1) and (2)：
It can be obtained by (1) and (3)：
It can be obtained by (1) and (4)：
···
Similarly, it can be obtained by (1) and (5)：
In formula：1 corresponding parameter of subscript represents the associated arguments of single series connection runner entrance, subscript 2,3
The corresponding parameters of i (n-1) represent the associated arguments at i-th section of minimum pressure section of single series connection runner, and subscript n corresponds to
Parameter represent the associated arguments at single series connection runner exit；hwi=hfi+hpiSingle stream is flowed through for average basis weight medium
The total energy loss of road i-stage, hfiFor with hwiCorresponding friction loss, hpiFor with hwiCorresponding local resistance loss；Ci
For the correction factor of total energy loss in process fluid flows at different levels；ρ is fluid density；G is acceleration of gravity；N is labyrinth disc
The hop count of piece；Q is the through-flow flow of single runner.
In the design of labyrinth disc, by the convenience that its size, medium are flowed to and processed, programmable labyrinth flow-path
Number be certain, the size of import sectional area A1 and discharge area An thus can be determined according to specific requirement；Exist simultaneously
In the design of labyrinth type valve, flow Q is to determine, then according to continuity equation, import average speedMost outlet is average
SpeedIt is to determine；In addition individually series connection runner inlet pressure P1 designs are given, pressure at remaining each section of minimum pressure section
piSize can determine that then the design principle of every section of area of section of single runner is as follows according to the design requirement of disc.
2nd section of area of section A2Only pass through the 1st grade of total energy loss h with fluidw1It is related：
In formula:ε1The local loss coefficient of the 1st grade of single runner is flowed through for average basis weight medium.
Known to the makeup of the imports,It relevant parameter can be inquired brings solution into and obtain, it is assumed that
Design has been carried out in 2nd segment structure, and inquiry relevant parameter is brought solution into and obtainedThen the 1st grade of energy loss hw1
It can be solved to obtain, then by hw1It brings (6) formula into, can solve to obtain the pressure P2 at the 2nd section of minimum pressure section, if pressure P2
Meet design requirement, then the 2nd segment structure reasonable design, design is otherwise re-started, then into calculating, until reaching required pressure
Then power size carries out the design of the 3rd section of cross section again under the premise of the 2nd grade of reasonable design.
3rd section of area of section A3Only with fluid by the 1st grade and the 2nd grade of total energy loss hw1+hw2It is related：
In formula:ε2The local loss coefficient of the 2nd grade of single runner is flowed through for average basis weight medium.
At the 1st grade namely in the case that single series connection runner paragraph 1 and the 2nd section of design are met the requirements, according to above-mentioned same
Method calculate the size of P3, required pressure size is reached, so that it is determined that individually the 3rd section of size of series connection runner.
4th section of area A4Only pass through first 3 grades total energy loss h with fluidw1+hw2+hw3It is related：
In formula:ε3The local loss coefficient of single runner 3rd level is flowed through for average basis weight medium.
In the case that at the 1st, 2 grade namely before single series connection runner, 3 sections of designs are met the requirements, according to above-mentioned same side
Method carries out the design of the 4th section of size.
···
Similarly, n-th section of area AnOnly with fluid by the total energy loss of (n-1) section before labyrinth flow-pathIt is related：
In formula:ε(n-1)The local loss coefficient of single runner (n-1) grade is flowed through for average basis weight medium.
Calculating is designed using above-mentioned same method, obtains the structure size of (n-1) section.Finally designed
Each segment structure links up, and can obtain the overall structure of single runner.
It is derived by above formula it is found that after the size and series of labyrinth disc determine, so that it may to labyrinth disc
Each section of flow channel cross-section product is designed.The present embodiment has turning, horizontal positioned labyrinth disc list with simplest
A series connection runner is derived.This method is equally applicable to the increasingly complex labyrinth disc of structure.Only in calculating process
" friction loss " and " local resistance loss " not at the same level is in different size in different schemes runner, but works as labyrinth disc
Size and after series determines, so that it may each section of flow channel cross-section of labyrinth disc product is designed.That is, labyrinth disc
Each section of flow channel cross-section product of piece is related to the size of labyrinth disc and series.
Embodiment 1
The labyrinth passage of one embodiment of the present of invention is shown in Fig. 8, and the labyrinth passage includes setting gradually
Entrance, interlude and outlet section, liquid medium enters by entrance, through interlude, is flowed out from outlet section.Wherein entrance
Positioned at the entrance of labyrinth passage, including four runners being arranged in parallel；Outlet section is located at the outlet of labyrinth passage, including two
The runner that item is arranged in parallel, every runner includes 7 bending sections, and the bending angle of bending section is about 90 °.
Interlude is between entrance and outlet section, including first flow section, second flow channel section and third flow channel section,
Middle first flow section is connect with entrance, including two bending sections；Second flow channel section is connected to first flow section and third flow channel section,
The runner being arranged in parallel including two；Third flow channel section is between second flow channel section and outlet section, including 3 bending sections.This
The sectional area of each runner is determined according to the size and series of labyrinth disc in the labyrinth passage cross of embodiment.
Embodiment 2
Fig. 9 and Figure 10 is shown the labyrinth passage of another embodiment of the present invention, the labyrinth passage include according to
Entrance, interlude and the outlet section of secondary setting, liquid medium are entered by entrance, through interlude, are flowed out from outlet section.Wherein
Entrance is located at the entrance of labyrinth passage, including five runners being arranged in parallel；Outlet section is located at the outlet of labyrinth passage,
The runner being arranged in parallel including two, every runner includes 7 bending sections, and the bending angle of bending section is about 90 °.
Interlude is between entrance and outlet section, including first flow section, second flow channel section and third flow channel section,
Middle first flow section is connect with entrance, including two bending sections；Second flow channel section is connected to first flow section and third flow channel section,
The runner being arranged in parallel including two；Third flow channel section is between second flow channel section and outlet section, including 3 bending sections.This
The cross-sectional area of each runner is determined according to the size and series of labyrinth disc in embodiment.In the specific implementation of the present invention
In mode, labyrinth disc includes the labyrinth passage of 10 the present embodiment.
The labyrinth disc pressure cloud atlas and drop of the labyrinth passage composition of 10 the present embodiment is shown in Figure 11 and Figure 12
Press hop count and pressue-graph.The labyrinth passage flow field simulation rate of discharge of the present embodiment is 0.1075kg/s, then single fan
The total flow of palace disc is 0.1075 × 10=1.075kg/s, reads the labyrinth passage described in the present embodiment per primary centre
Pressure on line, as a result as shown in figure 11, it is seen that from entrance to the pressure of outlet section on the labyrinth passage described in the present embodiment
Power is uniformly reduced.The graph of relation of decompression exponent number and pressure change on single labyrinth passage is as shown in figure 12, this implementation
Pressure from entrance to outlet section is uniformly reduced on the labyrinth disc runner of example, can under the premise of meeting traffic requirement energy
It is reduced at a slow speed after so that valve internal pressure is first quickly reduced, ensures that pressure is slowly decreased step by step, avoid largely pressing
Power is restored, and life of valve is increased.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be in the protection domain being defined in the patent claims.
Claims (9)
1. a kind of labyrinth disc for labyrinth adjusting valve, which is characterized in that the labyrinth disc is equipped at least one fan
Palace formula channel, the labyrinth passage include entrance, interlude and outlet section, and wherein entrance is located at entering for labyrinth passage
Mouthful, including a plurality of runner being arranged in parallel；Outlet section is located at the outlet of labyrinth passage, including a plurality of runner being arranged in parallel,
Interlude is connected to entrance and outlet section between entrance and outlet section.
2. labyrinth disc as described in claim 1, which is characterized in that the entrance of the labyrinth passage includes at least 3
The runner being set up in parallel.
3. labyrinth disc as claimed in claim 2, which is characterized in that the entrance of the labyrinth passage includes 4 or 5
The runner being set up in parallel.
4. labyrinth disc as described in claim 1, which is characterized in that the runner of the labyrinth passage interlude includes at least
One bending section.
5. labyrinth disc as described in claim 1, which is characterized in that the labyrinth passage interlude include it is at least one simultaneously
Join flow channel section, the parallel connection flow channel section includes two runners being arranged in parallel.
6. labyrinth disc as described in claim 1, which is characterized in that the outlet section of the labyrinth passage includes a plurality of parallel connection
The runner of setting, every runner include at least one bending section.
7. such as labyrinth disc described in claim 5 or 6, which is characterized in that the bending angle of the bending section is 90 °.
8. labyrinth disc as described in claim 1, which is characterized in that the labyrinth disc is equipped with 10 or 11 labyrinth types
Channel.
9. a kind of labyrinth adjusting valve, which is characterized in that include the labyrinth disc as described in claim 1-8 is any.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810614645.2A CN108679298A (en) | 2018-06-14 | 2018-06-14 | A kind of labyrinth disc for labyrinth adjusting valve |
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| CN201810614645.2A CN108679298A (en) | 2018-06-14 | 2018-06-14 | A kind of labyrinth disc for labyrinth adjusting valve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111188944A (en) * | 2020-02-19 | 2020-05-22 | 国核电力规划设计研究院有限公司 | Method for designing labyrinth groove type valve internal part |
| CN112081994A (en) * | 2020-09-25 | 2020-12-15 | 华中科技大学 | Axial rotation angle opposite-flushing throttling element and application thereof |
| CN112253491A (en) * | 2020-09-03 | 2021-01-22 | 上海发电设备成套设计研究院有限责任公司 | Multistage centrifugal supercritical carbon dioxide compressor |
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| CN201521710U (en) * | 2009-10-29 | 2010-07-07 | 黄育进 | Decompression plate for Labyrinth adjusting valve |
| CN201779350U (en) * | 2010-08-10 | 2011-03-30 | 上海阀特流体控制阀门有限公司 | Valve cage structure of pneumatic labyrinth regulating valve |
| CN201779351U (en) * | 2010-08-10 | 2011-03-30 | 上海阀特流体控制阀门有限公司 | Valve cage structure of pneumatic labyrinth type regulating valve |
| CN202901512U (en) * | 2012-09-12 | 2013-04-24 | 北京智创联合科技有限公司 | Labyrinth type regulating valve |
| CN106594382A (en) * | 2016-11-08 | 2017-04-26 | 上海发电设备成套设计研究院 | Adjusting valve labyrinth disc combined structure with guide sleeve |
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| US6161584A (en) * | 1998-06-30 | 2000-12-19 | Copes-Vulcan, Inc. | High energy loss fluid control device |
| CN201521710U (en) * | 2009-10-29 | 2010-07-07 | 黄育进 | Decompression plate for Labyrinth adjusting valve |
| CN201779350U (en) * | 2010-08-10 | 2011-03-30 | 上海阀特流体控制阀门有限公司 | Valve cage structure of pneumatic labyrinth regulating valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111188944A (en) * | 2020-02-19 | 2020-05-22 | 国核电力规划设计研究院有限公司 | Method for designing labyrinth groove type valve internal part |
| CN112253491A (en) * | 2020-09-03 | 2021-01-22 | 上海发电设备成套设计研究院有限责任公司 | Multistage centrifugal supercritical carbon dioxide compressor |
| CN112081994A (en) * | 2020-09-25 | 2020-12-15 | 华中科技大学 | Axial rotation angle opposite-flushing throttling element and application thereof |
| CN112081994B (en) * | 2020-09-25 | 2021-08-20 | 华中科技大学 | Multi-stage pressure reduction regulating valve based on axial rotation angle hedging type throttling element |
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