CN206419609U - A kind of device for improving the anti-Cavitation of industrial valve - Google Patents
A kind of device for improving the anti-Cavitation of industrial valve Download PDFInfo
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- CN206419609U CN206419609U CN201621450113.2U CN201621450113U CN206419609U CN 206419609 U CN206419609 U CN 206419609U CN 201621450113 U CN201621450113 U CN 201621450113U CN 206419609 U CN206419609 U CN 206419609U
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Abstract
The utility model is related to a kind of device for improving the anti-Cavitation of general industry valve, it is adaptable to any type of industrial valve, directly can be transformed on the basis of original valve pipe system：The utility model proposes set up between valve and pipeline fluid diffusion boost section; the advantage for have concurrently and improve inner-walls of duct after valve cavitation number, protection valve, reducing cavitation corrosion scope, can effectively improve the anti-Cavitation of industrial valve, transformation is simple; investment is small, and repair and maintenance is convenient.
Description
Technical field
The utility model is related to a kind of device for improving the anti-Cavitation of valve, specifically a kind of to be applied to any type
The standardization industrial valve of formula, special transformation is carried out to improve its anti-Cavitation to pipeline.
Background technology
When liquid internal pressure is less than its saturated vapor pressure, bubble will be formed, liquid is partly dissolved in addition
In gas can also be precipitated and form bubble.Then, when bubble with fluid flow to higher-pressure region by low-pressure area, bubble is burst rapidly
Go out, great impulsive force and high temperature are instantaneously produced crumbling and fall, this phenomenon turns into cavitation corrosion.
It is general in engineering to weigh the power that cavitation corrosion occurs with relative cavitation number.Cavitation number calculation formula：
Wherein, P is the pressure at internal fluid control point, pa；PaFor atmospheric pressure, pa；PvFor the saturated vapor pressure of fluid,
pa；γ is specific gravity；V is the flow velocity at control point, m/s.
Current cavitation number σ and critical cavitation number σ are defined as with respect to cavitation numberiRatio；The critical shape whether cavitation corrosion occurs
It is critical cavitation number that state, which calculates obtained cavitation number,.Therefore when critical cavitation number is more than 1, show that cavitation corrosion does not occur；Critical Cavitation Coefficient
Number is equal to 1, shows the critical condition occurred in cavitation corrosion；If critical cavitation number is less than 1, show that the position has occurred and that cavitation corrosion.
Under high water head effect, flow velocity is big in pipeline, pressure is low, and industrial valve is the control unit of pipe flow speed, there is throttling
Effect, overflow section accumulates small, flow velocity highest, formation low pressure whirlpool area herein, therefore sky easily occurs for pipeline after valve and valve
Erosion.
The main body of harm of valve cavitation corrosion is at three aspects：
1) the high-frequency percussion power that bubble collapse is produced acts on inner surface of pipeline after valve and valve, causes material to peel off, directly
Connect threat valve safe operation；
2) valve is vertically and horizontally being produced violent vibration when cavitation phenomenon occurs, cause fastener to loosen,
Accelerate the mechanical wear of pipeline and valve；
3) cavitation phenomenon is a kind of because bubble eruption can be produced is similar to the noise that sandstone flows through valve, has a strong impact on affected
Environment；
4) cavitation corrosion effect forms obstruction stream, influences the conveyance capacity of valve with the generation of bubble.
If the use condition of valve is poor, flow velocity big, easily occur in cavitation corrosion, common engineering using the multistage that anti-cavitation corrosion ability is strong
Dropping valve replaces general industry valve, and its operation principle is：Make what the pressure drop of control valve is divided into, each less pressure drop is protected
Card does not make pressure at contracting stream less than the saturated vapour pressure of liquid, so as to eliminate the generation of bubble, cavitation corrosion is not occurred.But it is multistage
Dropping valve internal structure is complicated, and price is high, is the several times of common valve cost.
The content of the invention
Technical problem to be solved in the utility model is：The cavitation corrosion occurred under conditions of high flow rate for industrial valve shows
As propose a kind of economic and reliable can improve the technical scheme of the anti-Cavitation of valve itself.
The utility model solve above technical problem technical scheme be：
Overflow section product is minimum at the mechanism produced according to cavitation corrosion, valve, therefore flow velocity is maximum, pressure is minimum, is vacuole
Generating region, subsequent vacuole is carried to higher-pressure region moment by fluid crumbles and fall so that occur cavitation erosion, thus deducibility bubble collapse
Area is concentrated mainly on after valve in pipeline.
Based on above-mentioned analysis, the utility model avoids the difficulty transformed valve runner itself, looks for another way, and is managed after valve
Road build is started with, and particular design and focused protection are carried out to pipeline build after valve, proposes a kind of raising anti-cavitation corrosion of industrial valve
The device of performance, it is characterised in that described device be overflow section accumulate more than aqueduct sectional area mutation or gradual change it is hollow
Structure, it is arranged on after industrial valve, before aqueduct.
Preferably,
Described device can be mutation structure, and the overflow section product of its water inlet end to water side keeps constant.
It is another preferably,
Described device is grading structure, and the overflow section product of its water inlet end to water side first gradually expands, then is gradually reduced.
The utility model has the advantages that：
1) increase of area of efflux is conducive to fluid fully to spread after valve, the limitation without former pipeline to flow direction, certain
The pressure after valve is improved while flow velocity is reduced in degree, according to cavitation number calculation formula, under operating mode of the same race, flow velocity reduction
And pressure is improved, the value of cavitation number accordingly increases and critical cavitation number is constant, therefore the value of relative cavitation also becomes big, shows valve
The raising of anti-cavitation corrosion ability.
2) common pipe inwall is located at bubble collapse area, sees Fig. 2, and the sectional area of diffusion boost section is more than pipeline after former valve and cut
Area, inner wall surface thereof makes cavitation corrosion act on internal fluid away from bubble collapse area, plays a part of protecting inwall not to be destroyed.
In high flow rate pipe design, the Cavitation of industrial valve directly influences the safe operation of system, this practicality
New structure is simple, it is adaptable to any type of industrial valve, greatly reduces cost, improves engineering safety, with very
Good application prospect.
Brief description of the drawings
Fig. 1 is that the diffusion boost section layout pattern of embodiment one and conventional pipelines arrange contrast.
Fig. 2 is general industry butterfly valve bubble collapse area schematic diagram.
Fig. 3 is the arrangement schematic diagram of the utility model embodiment two.
Embodiment
Embodiment one
Fluid diffusion boost section layout pattern is shown in Fig. 1 with traditional water-supply-pipe build contrast after valve.
A kind of device for improving the anti-Cavitation of industrial valve, diffusion is set up after industrial valve 1, before aqueduct 2 and is increased
Press section 3；Flow velocity is reduced by this special construction and improves pressure, so as to improve the anti-Cavitation of industrial valve.
Diffusion increase section 3 uses grading structure, and its water inlet end and water side can be using by the way of welding and the pipeline of upstream and downstream
Docking.Water inlet end is first gradually extended to three times of pipeline section product or so to the overflow section product of water side, then is gradually reduced, and expands
It is about five times of calibers to dissipate supercharging segment length.
Embodiment two
Such as Fig. 3, the diffusion boost section 3 of the anti-Cavitation of raising industrial valve of the present embodiment uses mutation structure, and it enters
Water end (W.E.) keeps constant to the overflow section product of water side, about three times of aqueduct sectional area or so.Diffusion supercharging segment length
About five times calibers.After valve after the increase of overflow section product, main flow can spread along journey quickly, reduce main flow flow velocity, simultaneously
Increase pressure after cleaning door, it is favourable to the anti-Cavitation of raising industrial valve.
According to the difference of engineering practice, the utility model can also have other embodiments, as long as in industrial valve
Afterwards, inclined-plane (or curved surface) gradual change or right angle mutation are set up before aqueduct, overflow section product becomes big diffusion boost section to play
The arrangement form of anti-Cavitation of industrial valve is improved in the protection domain of the utility model requirement.
Claims (3)
1. a kind of device for improving the anti-Cavitation of industrial valve, it is characterised in that described device is that overflow section product is more than water delivery
Pipeline（2）The hollow structure of mutation or the gradual change of sectional area, it is arranged on industrial valve（1）Afterwards, aqueduct（2）Before.
2. the device of the anti-Cavitation of industrial valve is improved as claimed in claim 1, it is characterised in that：Described device is abrupt junction
Structure, the overflow section product of its water inlet end to water side keeps constant.
3. the device of the anti-Cavitation of industrial valve is improved as claimed in claim 1, it is characterised in that：Described device is graded junction
Structure, the overflow section product of its water inlet end to water side first gradually expands, then is gradually reduced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621450113.2U CN206419609U (en) | 2016-12-27 | 2016-12-27 | A kind of device for improving the anti-Cavitation of industrial valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621450113.2U CN206419609U (en) | 2016-12-27 | 2016-12-27 | A kind of device for improving the anti-Cavitation of industrial valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206419609U true CN206419609U (en) | 2017-08-18 |
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ID=59576806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621450113.2U Active CN206419609U (en) | 2016-12-27 | 2016-12-27 | A kind of device for improving the anti-Cavitation of industrial valve |
Country Status (1)
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| CN (1) | CN206419609U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106764224A (en) * | 2016-12-27 | 2017-05-31 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of universal method and device for improving the anti-Cavitation of industrial valve |
| CN109357023A (en) * | 2018-10-30 | 2019-02-19 | 武汉科技大学 | A kind of butterfly valve |
-
2016
- 2016-12-27 CN CN201621450113.2U patent/CN206419609U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106764224A (en) * | 2016-12-27 | 2017-05-31 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of universal method and device for improving the anti-Cavitation of industrial valve |
| CN109357023A (en) * | 2018-10-30 | 2019-02-19 | 武汉科技大学 | A kind of butterfly valve |
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