CN101737559B - Labyrinth minimum flow control valve - Google Patents
Labyrinth minimum flow control valve Download PDFInfo
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- CN101737559B CN101737559B CN2008102029155A CN200810202915A CN101737559B CN 101737559 B CN101737559 B CN 101737559B CN 2008102029155 A CN2008102029155 A CN 2008102029155A CN 200810202915 A CN200810202915 A CN 200810202915A CN 101737559 B CN101737559 B CN 101737559B
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- valve
- labyrinth
- flow control
- minimum flow
- control valve
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- 230000007704 transition Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 239000007788 liquid Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention relates to a labyrinth minimum flow control valve. The valve comprises a valve body and a valve spool and a valve base which are arranged in the valve body, wherein the valve body is provided with a water inlet and outlet opening. The valve is characterized in that one end of the water inlet and outlet opening is provided with a throttle device, and a labyrinth disc is arranged in the valve body. By adopting the design of diameter-variable unequal flow channels, the labyrinth minimum flow control valve enables the high-pressure liquid to flow along the center of a flow channel, prevents the turbulence caused by the flow along the channel wall, and has the excellent characteristics of cavitation resistance, low noise, high differential pressure endurance and long service life.
Description
Technical field
Patent of the present invention relates to the thermofluid system technical field, concrete relates to the minimum flow control valve that a kind of station boiler feed water pump is used.This valve is mainly used in the pressure adjusting and reduces cavitation, can make noise greatly reduce, increase the service life.
Background technique
When peak-load regulation operation and overload state, required flow is during less than specified value, and liquid stream temperature and pressure sharply rises, and will cause vaporizing liquid in the feed water pump, even can cause feed water pump to work.The minimum flow control valve automatic function is exactly when feed water pump output flow during less than certain value, opens automatically immediately, and unnecessary flow is branched to oxygen-eliminating device; thereby feed water pump is moved under reliable condition; effectively the safe operation of protection feed water pump is also made recycling residual heat, energy saving.
Minimum flow control valve is one of valve the most abominable in the operating conditions of power station.Because of its mounting point is between boiler feed pump outlet and the oxygen-eliminating device, bear huge pressure reduction between the two.No matter open or closed condition under, the minimum discharge modulating valve is in all the time under the High Pressure Difference and works in the recirculating system.When the minimum discharge modulating valve is in opening state, high pressure water is branched to oxygen-eliminating device after reducing pressure step by step, and in decompression process, cavitation can not take place; And when it is in closed condition, can bear up to 35Mpa, even higher differential static pressure, and accomplish to close tight, nothing leakage.
The used minimum flow control valve of present domestic thermoelectricity plant is to belong to the control valve that multistage orifice plate has general labyrinth disc concurrently, conventional valves adopts multistage throttle, its resistance coefficient of step-down is about 10 step by step, can solve the cavitation problem of pressure reduction valve when not high, noise is also less than the noise of miscellaneous equipment operation on every side.But on the above supercritical unit of 300MW, because flow velocity and pressure reduction are high, make that problems such as valve erosion, vibration, noise are more serious, and flow is along with the variation increase of stroke, reduce widely because of continuous firing under high pressure, the high flow rate working life of valve, thereby occur leaking, waste energy.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the shortcoming of existing minimum flow control valve, and a kind of labyrinth minimum flow control valve is provided.
In order to address the above problem technological scheme of the present invention is such:
Labyrinth minimum flow control valve, comprise valve body, be arranged on spool, valve seat in the valve body, have intake-outlet on the valve body and in valve body, be provided with the inlet and outlet channel of linking up intake-outlet, it is characterized in that, the one or both ends of appointing at described intake-outlet are provided with throttling arrangement, and the transition position between the inlet and outlet channel of valve inner is provided with labyrinth disc.
Described intake-outlet connects inlet and outlet channel in valve body, the inlet and outlet channel mutual dislocation is arranged.
Described throttling arrangement longitudinal cross-section is multistage horn mouth mutual superposition shape.
The relative valve body of described labyrinth disc is fixed, and relative valve core movement.
Described labyrinth disc is an annular, and labyrinth disc is arranged on valve seat top, the axis coinciding of labyrinth disc center and spool.
The upper and lower surface of labyrinth disc respectively has a plurality of restrictor rings, and restrictor ring is made of a plurality of different little restrictor rings.
Each restrictor ring has seven little restrictor rings to constitute, and wherein the first little restrictor ring has outside entrance channel, second to the 6th trifle stream loop resistance power runner, and the 7th little restrictor ring has the elbow outlet and connects other restrictor rings.
Described valve seat top also is provided with the current-sharing cover, and the current-sharing cover contacts with labyrinth disc top.
Described spool is that front end is a sleeve shape, and the spool rear end connects valve rod.
Described valve body upper end is provided with valve gap, and the valve gap upper end is provided with support, and the support upper end is provided with electric actuator, and described valve rod passes valve gap and links to each other with electric actuator.
Described valve body is connected by bolt seal with valve gap.
Described valve gap is connected by bolt seal with support.
Described electric actuator has a flexible rod, and flexible rod stretches in the support, and the flexible rod front end has a contiguous block, and described flexible rod is connected with valve rod by contiguous block.
When labyrinth minimum flow valve of the present invention was worked, electric actuator drove valve rod and moves up and down, and then drove valve core movement, thereby the rate-of flow through valve body is changed.
Beneficial effect, labyrinth minimum flow control valve of the present invention adopts reducing not wait the runner design, make highly pressurised liquid longshore current road intermediate flow, prevent along the wall turbulization that flows, have anti-cavitation, low noise, bear High Pressure Difference two characteristics, long service life arranged.
Description of drawings
Describe the present invention in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is the structural representation of labyrinth minimum flow control valve of the present invention;
Fig. 2 is a labyrinth disc partial structurtes schematic representation of the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Referring to Fig. 1, labyrinth minimum flow control valve mainly contains valve body 2, valve gap 11, support 13 and electric actuator 15 and constitutes.
The two ends of valve body 2 are provided with intake-outlet 3, and intake-outlet 3 connects inlet and outlet channel in valve body, and the inlet and outlet channel mutual dislocation is arranged.End at intake-outlet 3 is provided with throttling arrangement 1, throttling arrangement 1 is used to reduce velocity of medium, plays the effect of damping, and throttling arrangement 1 sectional shape is a plurality of horn mouth mutual superposition shapes, because the big the other end of horn mouth one end is little, so can play the effect that reduces flow velocity.
Be provided with parts such as valve seat 5, labyrinth disc 6, current-sharing cover 7 and spool 8 in valve body 2 inside, be provided with valve washer 4 between valve seat 5 and the valve body 2, valve seat 5 tops are provided with labyrinth disc 6, labyrinth disc 6 is a ring, labyrinth disc 6 upper ends are provided with current-sharing cover 7, and current-sharing cover 7 also is a ring, at valve body 2 middle parts spool 8 is set, spool 8 can move in current-sharing cover 7 and labyrinth disc 6, and spool 8 front ends are telescoping structure.The rear end of spool 8 connects valve rod 9.
When labyrinth minimum flow valve of the present invention was worked, electric actuator drove valve rod and moves up and down, and then drove valve core movement, thereby the rate-of flow through valve body is changed.
Referring to Fig. 2, labyrinth disc 6 of the present invention, upper and lower surface is provided with restrictor ring, and the restrictor ring of upper and lower surface is corresponding, shown in the figure is one of them restrictor ring schematic representation, a restrictor ring has seven little restrictor rings to constitute among the figure, and wherein first little restrictor ring 61 is made up of entrance channel, an elbow, a variable cross section elbow.Second to the 6th little restrictor ring 62,63,64,65,66 mainly is made up of an orifice plate resistance piece, two elbows.The 7th little restrictor ring 67 has only an elbow.The outlet operating mode of previous restrictor ring calculates the drag hump of each link respectively as the inlet of next restrictor ring, and then draws overall presure drop.
Labyrinth disc also has following feature: (1) little inlet-entrance section is minimum in whole runner, and effective cross section increases gradually subsequently, and the purpose in little inlet and cross section is to prevent that external foreign material from entering close of the interior damage of valve.(2) runner of flaring-increase gradually with channel cross-section, hydrodynamic pressure just constantly reduces, and circle ring disk outlet port flow velocity will drop to very low level like this.By such runner,, just do not exist traditional minimum flow control valve that the local compression recovery point of cavitation takes place like that along with the generation speed of pressure drop is under control.(3) a large amount of turning round-because having a lot of turns round, when obtaining pressure and falling, flow velocity is significantly less than the design of having only 3-4 to turn round.(4) runner around isostasy circle-circle ring disk internal diameter can equilibrium be because the caused pressure surge of uneven velocity distribution.This isostasy structure can be guaranteed the spool stress balance, and the unlikely mechanical vibration noise that causes.(5) fluid in the weir formula overflow outlet-circle ring disk must flow out through overflow weir, and having guaranteed only has the lower axial pencil of a mean velocity to flow into the valve pocket inner chamber in this outlet, thereby has avoided local velocity too high and cause the possibility of damage.
Compared with prior art, labyrinth minimum flow control valve of the present invention adopts reducing not wait the runner design, make highly pressurised liquid longshore current road intermediate flow, prevent along the wall turbulization that flows, have anti-cavitation, low noise, bear High Pressure Difference two characteristics, long service life arranged.
More than show and described basic principle of the present invention, major character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (10)
1. labyrinth minimum flow control valve, comprise valve body, be arranged on the spool in the valve body, valve seat, have intake-outlet on the valve body and in valve body, be provided with the inlet and outlet channel of linking up intake-outlet, it is characterized in that, the one or both ends of appointing at described intake-outlet are provided with throttling arrangement, transition position between the inlet and outlet channel of valve inner is provided with labyrinth disc, described labyrinth disc is an annular, labyrinth disc is arranged on valve seat top, the axis coinciding of labyrinth disc center and spool is on the labyrinth disc, lower surface respectively has a plurality of restrictor rings, and restrictor ring is made of a plurality of different little restrictor rings, each restrictor ring has seven little restrictor rings to constitute, wherein the first little restrictor ring has outside entrance channel, second to the 6th trifle stream loop resistance power runner, and the 7th little restrictor ring has the elbow outlet and connects other restrictor rings.
2. labyrinth minimum flow control valve according to claim 1 is characterized in that, the inlet and outlet channel mutual dislocation is arranged.
3. labyrinth minimum flow control valve according to claim 1 is characterized in that, the relative valve body of described labyrinth disc is fixed, and relative valve core movement.
4. labyrinth minimum flow control valve according to claim 1 is characterized in that, described throttling arrangement longitudinal cross-section is multistage horn mouth mutual superposition shape.
5. labyrinth minimum flow control valve according to claim 1 is characterized in that, described valve seat top also is provided with the current-sharing cover, and the current-sharing cover contacts with labyrinth disc top.
6. labyrinth minimum flow control valve according to claim 1 is characterized in that, described spool is that front end is a sleeve shape, and the spool rear end connects valve rod.
7. labyrinth minimum flow control valve according to claim 1 is characterized in that, described valve body upper end is provided with valve gap, and the valve gap upper end is provided with support, and the support upper end is provided with electric actuator, and described valve rod passes valve gap and links to each other with electric actuator.
8. labyrinth minimum flow control valve according to claim 7 is characterized in that described valve body is connected by bolt seal with valve gap.
9. labyrinth minimum flow control valve according to claim 7 is characterized in that described valve gap is connected by bolt seal with support.
10. labyrinth minimum flow control valve according to claim 7 is characterized in that described electric actuator has a flexible rod, and flexible rod stretches in the support, and the flexible rod front end has a contiguous block, and described flexible rod is connected with valve rod by contiguous block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102029155A CN101737559B (en) | 2008-11-18 | 2008-11-18 | Labyrinth minimum flow control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102029155A CN101737559B (en) | 2008-11-18 | 2008-11-18 | Labyrinth minimum flow control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101737559A CN101737559A (en) | 2010-06-16 |
| CN101737559B true CN101737559B (en) | 2011-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102029155A Expired - Fee Related CN101737559B (en) | 2008-11-18 | 2008-11-18 | Labyrinth minimum flow control valve |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956869A (en) * | 2010-10-11 | 2011-01-26 | 无锡智能自控工程有限公司 | Communicated labyrinth valve |
| WO2014016937A1 (en) * | 2012-07-26 | 2014-01-30 | 三菱電機株式会社 | Relief valve for engine with turbocharger |
| CN102829243A (en) * | 2012-09-10 | 2012-12-19 | 天津百利展发集团有限公司 | Secondary-throttling cutoff balanced throttling valve |
| CN102853138A (en) * | 2012-09-17 | 2013-01-02 | 李理 | Manual valve with support device |
| CN103321607A (en) * | 2013-07-01 | 2013-09-25 | 西南石油大学 | Double-layer-cage double-plunger cage throttling valve |
| CN103527799B (en) * | 2013-08-05 | 2015-11-25 | 南通市电站阀门有限公司 | A kind of septum valve |
| CN107299902B (en) | 2016-04-15 | 2021-06-25 | 德昌电机(深圳)有限公司 | Drain pump and household appliance with same |
| CN105952962B (en) * | 2016-06-30 | 2024-03-08 | 航天海鹰(哈尔滨)钛业有限公司 | Labyrinth regulating valve core with temperature control function |
| CN106838370A (en) * | 2017-03-13 | 2017-06-13 | 钟浪雅 | A kind of triple valve for surveying water velocity and energy import filtering |
| CN110159772B (en) * | 2019-06-04 | 2020-09-04 | 四川长仪油气集输设备股份有限公司 | Three-stage throttling type throttle valve |
| CN110939746A (en) * | 2019-12-25 | 2020-03-31 | 艾坦姆流体控制技术（北京）有限公司 | Single-seat angle valve with special structure |
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2008
- 2008-11-18 CN CN2008102029155A patent/CN101737559B/en not_active Expired - Fee Related
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| CN101737559A (en) | 2010-06-16 |
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Granted publication date: 20111221 |