CN103867729A - Labyrinth type minimum flow valve - Google Patents
Labyrinth type minimum flow valve Download PDFInfo
- Publication number
- CN103867729A CN103867729A CN201410127246.5A CN201410127246A CN103867729A CN 103867729 A CN103867729 A CN 103867729A CN 201410127246 A CN201410127246 A CN 201410127246A CN 103867729 A CN103867729 A CN 103867729A
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- China
- Prior art keywords
- valve
- runner
- flow
- labyrinth
- water inlet
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Classifications
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/52—Means for additional adjustment of the rate of flow
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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
- F16K47/04—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member
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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 labyrinth type minimum flow valve which comprises a valve body, a valve cover and a valve rod. The valve cover is installed above the valve body. A water inlet passageway is arranged on one side of the position below the valve body. A water outlet passageway is arranged on the other side of the position below the valve body. The passageway intersection of the water inlet passageway and the water outlet passageway is provided with a valve base. A plurality of labyrinth discs are evenly welded to the periphery of the valve base and arranged at the downstream portion of the water inlet passageway. One end of the valve rod is fixed into the valve cover. The other end of the valve rod is provided with a valve element which is movably arranged into the inner wall of the valve base. Through the method, the labyrinth type minimum flow valve can be effectively sealed and can effectively prevent cavitation.
Description
Technical field
The present invention relates to a kind of labyrinth minimum flow valve, particularly relate to a kind of for the supporting critical valves of Boiler Feedwater System in Power Plant, for the protection to feed water pump.
Background technique
In prior art, Minimum Flowrate of Feed Pump valve claims again feed water pump recycle valve, giving water recycle minimum flow valve is the boiler for high power station feed water pump bypass for subcritical thermoelectric generator assembly cover, requirement more effectively throttling reduction of speed, reduce or eliminate the impact of cavitating on valve and pipeline, make valve keep reliably zero leakage state, can maintain longer service life closing Shi Nenggeng.But because valve pressure reduction is higher, in addition the thrust of regulating-valve actuator is less, therefore be generally not easy to reach zero leakage state when valve closing, very easily occur flash distillation and cavitation phenomenons at valve throttle portion back segment, the most high-pressure differential valve that falls all inevitably has flash distillation and cavitation erosion when for this operating mode simultaneously.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of labyrinth minimum flow valve, can effectively seal and reduce even to prevent cavitation erosion.
For solving the problems of the technologies described above, the technological scheme that the present invention adopts is: a kind of labyrinth minimum flow valve is provided, comprise: valve body, valve gap and valve rod, described valve gap is arranged on valve body top, one side of described valve body below arranges water inlet flow channel, the opposite side of valve body below sets out water flow passage, passage intersection at water inlet flow channel and outlet passage is provided with valve seat, peripheral uniform welding at valve seat has many labyrinth discs, described labyrinth disc is arranged at the downstream of water inlet flow channel, one end of described valve rod is fixed on valve gap inside, the other end of described valve rod is provided with spool, the inwall at valve seat is inserted in described spool activity.
In a preferred embodiment of the present invention, described labyrinth disc is provided with first flow, the second runner and the 3rd runner, described first flow is connected the second runner and the 3rd runner simultaneously, first flow, the second runner and the flow passage structure of the 3rd runner are respectively the warp architecture that multiple " bow " type head and the tail are connected, and the runner of described the second runner and the 3rd runner is symmetrical arranged.
In a preferred embodiment of the present invention, the Flow area of the end of described the second runner and the 3rd runner is greater than the Flow area in self last throttling road.
In a preferred embodiment of the present invention, the outlet end of described the second runner and the 3rd runner outlet end between angle be 90 °.
In a preferred embodiment of the present invention, the top of described valve seat is provided with leading truck.
In a preferred embodiment of the present invention, described water inlet flow channel go out the entrance height of open height higher than outlet passage.
The invention has the beneficial effects as follows: the present invention realizes the circulation style of " from top to bottom, from inside to outside ", MEDIA FLOW is to respect to spool, by flow direction design from top to down, make can obtain larger sealing force after valve closing, " from inside to outside " can make valve obtain best usability, and can within the scope of total travel, regulate.
In addition, labyrinth disc from the inlet to the outlet Flow area increases step by step, be little entrance, the design of large outlet, along with channel cross-section increases gradually, the pressure of medium just constantly reduces, the flow velocity in labyrinth disc outlet port just drops to very low level like this, by such runner, along with the continuous decline of pressure, flow velocity is under control, and does not just exist traditional minimum flow valve that the pressure recovery point of cavitation erosion occurs like that; Simultaneously, outlet flow is designed to symmetrical position, can make on the one hand the medium flowing out liquidate, the energy of cancelling out each other, flow velocity is further controlled, and on the other hand, the medium still with certain flow rate can ingeniously be avoided valve body and other vital part, reduce the erosion attack to part, extend the working life of valve.
Brief description of the drawings
Fig. 1 is the internal structure schematic diagram of labyrinth minimum flow valve one preferred embodiment of the present invention;
Fig. 2 is the local enlarged diagram of labyrinth disc in labyrinth minimum flow valve of the present invention.
In accompanying drawing, the mark of each parts is as follows: 1, outlet passage; 2, water inlet flow channel; 3, valve seat; 4, leading truck; 5, valve body; 6, spool; 7, valve rod; 8, valve gap; 9, labyrinth disc; 10, the second runner; 11, the 3rd runner; 12, last throttling road; 13, first flow.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that, protection scope of the present invention is made to more explicit defining.
Refer to Fig. 1 and Fig. 2, the embodiment of the present invention comprises: a kind of labyrinth minimum flow valve, comprise: valve body 5, valve gap 8, valve rod 7, described valve gap 8 is arranged on valve body 5 tops, one side of described valve body 5 belows arranges water inlet flow channel 2, the opposite side of valve body 5 belows sets out water flow passage 1, be provided with valve seat 3 at water inlet flow channel 2 with the passage intersection of outlet passage 1, peripheral uniform welding at valve seat 3 has many labyrinth discs 9, labyrinth disc 9 is arranged at the downstream of water inlet flow channel 2, one end of described valve rod 7 is fixed on valve gap 8 inside, the other end of described valve rod 7 is provided with spool 6, the inwall at valve seat 3 is inserted in described spool 6 activities, the top of described valve seat 3 is provided with leading truck 4.
Furtherly, described labyrinth disc 9 is provided with first flow 13, the second runner 10 and the 3rd runner 11, described first flow 13 is connected the second runner 10 and the 3rd runner 11 simultaneously, first flow 13, the second runner 10 and the flow passage structure of the 3rd runner 11 are respectively the warp architecture that multiple " bow " type head and the tail are connected, and the runner of described the second runner 10 and the 3rd runner 11 is symmetrical arranged; The Flow area of the end of the second runner 10 and the 3rd runner 11 is all greater than the Flow area in self last throttling road 12, the outlet end of the second runner 10 and the 3rd runner 11 outlet end between angle be 90 °, water inlet flow channel 2 go out the entrance height of open height higher than outlet passage 1.
The working principle of labyrinth minimum flow valve of the present invention: when valve rod 7 moves up, band movable valve plug 6, now the sealing surface of spool 6 separates with the sealing surface of valve seat 3, valve opening, the circulating water of boiler feed pump flows into valve body 5 from water intake 2, flow through restriction and the labyrinth disc 9 of leading truck 4, spool 6, finally flow out from water outlet 1.
Because circulating water flows to outlet passage 1 from water inlet flow channel 2, spool 6 is produced to auxiliary sealing force, be beneficial to the sealing of valve, can reach the standard of zero leakage.
Refer to Fig. 2, in the time flowing through labyrinth disc 9, flow into from first flow 13, then flow out from the second runner 10 and the 3rd runner 11 simultaneously, because the second runner 10 and the 3rd runner 11 liquidate mutually, thereby water outlet energy is reduced greatly, produce effective hypotensive effect, be greater than the Flow area in self last throttling road 12 because of the Flow area of the throttling latter end of the second runner 10 and the 3rd runner 11 simultaneously, flow velocity is further reduced, make the degree of flash distillation and cavitation erosion reduce even elimination, simultaneously if there is cavitation erosion also can allow position that cavitation occurs away from or avoid the critical surfaces of valve.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (6)
1. a labyrinth minimum flow valve, it is characterized in that, comprise: valve body, valve gap and valve rod, described valve gap is arranged on valve body top, one side of described valve body below arranges water inlet flow channel, the opposite side of valve body below sets out water flow passage, passage intersection at water inlet flow channel and outlet passage is provided with valve seat, peripheral uniform welding at valve seat has many labyrinth discs, described labyrinth disc is arranged at the downstream of water inlet flow channel, one end of described valve rod is fixed on valve gap inside, and the other end of described valve rod is provided with spool, and the inwall at valve seat is inserted in described spool activity.
2. labyrinth minimum flow valve according to claim 1, it is characterized in that: described labyrinth disc is provided with first flow, the second runner and the 3rd runner, described first flow is connected the second runner and the 3rd runner simultaneously, first flow, the second runner and the flow passage structure of the 3rd runner are respectively the warp architecture that multiple " bow " type head and the tail are connected, and the runner of described the second runner and the 3rd runner is symmetrical arranged.
3. labyrinth minimum flow valve according to claim 2, is characterized in that: the Flow area of the end of described the second runner and the 3rd runner is greater than the Flow area in self last throttling road.
4. labyrinth minimum flow valve according to claim 2, is characterized in that: the outlet end of described the second runner and the 3rd runner outlet end between angle be 90 °.
5. labyrinth minimum flow valve according to claim 1, is characterized in that: the top of described valve seat is provided with leading truck.
6. labyrinth minimum flow valve according to claim 1, is characterized in that: described water inlet flow channel go out the entrance height of open height higher than outlet passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410127246.5A CN103867729A (en) | 2014-04-01 | 2014-04-01 | Labyrinth type minimum flow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410127246.5A CN103867729A (en) | 2014-04-01 | 2014-04-01 | Labyrinth type minimum flow valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103867729A true CN103867729A (en) | 2014-06-18 |
Family
ID=50906574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410127246.5A Pending CN103867729A (en) | 2014-04-01 | 2014-04-01 | Labyrinth type minimum flow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103867729A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107299902A (en) * | 2016-04-15 | 2017-10-27 | 德昌电机(深圳)有限公司 | Draining pump and the household electrical appliance with the draining pump |
| CN107717203A (en) * | 2017-11-21 | 2018-02-23 | 山东沃克控制阀有限公司 | A kind of labyrinth decompression valve valve block, valve block processing mold and valve block preparation method |
| CN113124230A (en) * | 2021-04-26 | 2021-07-16 | 华能国际电力股份有限公司上海石洞口第一电厂 | Adjustable labyrinth minimum flow control valve |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2310514A1 (en) * | 1975-05-07 | 1976-12-03 | Masoneilan Int Inc | Noise reducing device for expansion valve - is formed with cone shaped labyrinth of intersecting wires at outlet |
| JPH09100945A (en) * | 1995-10-02 | 1997-04-15 | Nkk Corp | Cage type low noise adjusting valve |
| CN201166191Y (en) * | 2008-03-28 | 2008-12-17 | 大连亨利测控仪表工程有限公司 | Labyrinth type multilevel decompression control valve |
| CN101413602A (en) * | 2008-11-20 | 2009-04-22 | 无锡智能自控工程有限公司 | High pressure labyrinth type anti-cavitation sleeve valve |
| US20090183790A1 (en) * | 2008-01-22 | 2009-07-23 | Moore Jason M | Direct metal laser sintered flow control element |
| CN101504079A (en) * | 2009-03-07 | 2009-08-12 | 无锡智能自控工程有限公司 | Screw-in forged high pressure air defense small-flow corner valve |
| CN201531676U (en) * | 2009-11-03 | 2010-07-21 | 徐州阿卡控制阀门有限公司 | Labyrinth noise reduction regulating valve |
| CN201547279U (en) * | 2009-11-27 | 2010-08-11 | 上海电力修造总厂有限公司 | Labyrinth throttle decompression core package for adjusting valve |
| CN101956869A (en) * | 2010-10-11 | 2011-01-26 | 无锡智能自控工程有限公司 | Communicated labyrinth valve |
| CN202768909U (en) * | 2012-09-12 | 2013-03-06 | 陈伯琴 | Maze control valve |
| CN203202256U (en) * | 2013-01-25 | 2013-09-18 | 江苏宇达电站辅机阀门制造有限公司 | Small flow control valve |
| CN203757008U (en) * | 2014-04-01 | 2014-08-06 | 苏州道森阀门有限公司 | Labyrinth type minimum flow valve |
-
2014
- 2014-04-01 CN CN201410127246.5A patent/CN103867729A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2310514A1 (en) * | 1975-05-07 | 1976-12-03 | Masoneilan Int Inc | Noise reducing device for expansion valve - is formed with cone shaped labyrinth of intersecting wires at outlet |
| JPH09100945A (en) * | 1995-10-02 | 1997-04-15 | Nkk Corp | Cage type low noise adjusting valve |
| US20090183790A1 (en) * | 2008-01-22 | 2009-07-23 | Moore Jason M | Direct metal laser sintered flow control element |
| CN201166191Y (en) * | 2008-03-28 | 2008-12-17 | 大连亨利测控仪表工程有限公司 | Labyrinth type multilevel decompression control valve |
| CN101413602A (en) * | 2008-11-20 | 2009-04-22 | 无锡智能自控工程有限公司 | High pressure labyrinth type anti-cavitation sleeve valve |
| CN101504079A (en) * | 2009-03-07 | 2009-08-12 | 无锡智能自控工程有限公司 | Screw-in forged high pressure air defense small-flow corner valve |
| CN201531676U (en) * | 2009-11-03 | 2010-07-21 | 徐州阿卡控制阀门有限公司 | Labyrinth noise reduction regulating valve |
| CN201547279U (en) * | 2009-11-27 | 2010-08-11 | 上海电力修造总厂有限公司 | Labyrinth throttle decompression core package for adjusting valve |
| CN101956869A (en) * | 2010-10-11 | 2011-01-26 | 无锡智能自控工程有限公司 | Communicated labyrinth valve |
| CN202768909U (en) * | 2012-09-12 | 2013-03-06 | 陈伯琴 | Maze control valve |
| CN203202256U (en) * | 2013-01-25 | 2013-09-18 | 江苏宇达电站辅机阀门制造有限公司 | Small flow control valve |
| CN203757008U (en) * | 2014-04-01 | 2014-08-06 | 苏州道森阀门有限公司 | Labyrinth type minimum flow valve |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107299902A (en) * | 2016-04-15 | 2017-10-27 | 德昌电机(深圳)有限公司 | Draining pump and the household electrical appliance with the draining pump |
| CN107717203A (en) * | 2017-11-21 | 2018-02-23 | 山东沃克控制阀有限公司 | A kind of labyrinth decompression valve valve block, valve block processing mold and valve block preparation method |
| CN113124230A (en) * | 2021-04-26 | 2021-07-16 | 华能国际电力股份有限公司上海石洞口第一电厂 | Adjustable labyrinth minimum flow control valve |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140618 |
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| RJ01 | Rejection of invention patent application after publication |