CN110043744A - A method of determining high lift water-carriage system termination of pumping accident pump late gate Closing Law - Google Patents
A method of determining high lift water-carriage system termination of pumping accident pump late gate Closing Law Download PDFInfo
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- CN110043744A CN110043744A CN201910331645.6A CN201910331645A CN110043744A CN 110043744 A CN110043744 A CN 110043744A CN 201910331645 A CN201910331645 A CN 201910331645A CN 110043744 A CN110043744 A CN 110043744A
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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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- Computer Hardware Design (AREA)
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- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a kind of methods for determining high lift water-carriage system termination of pumping accident pump late gate Closing Law, for meeting the high lift water-carriage system of condition, it can be by the pump-stopping water hammer numerical simulation result in the case of valve tripping, draft out the initial effects moment of valve closing, and then the condition that should be met according to the initial effects moment, it may be determined that go out the Closing Law of valve.The present invention omits cumbersome numerical simulation tentative calculation, quickly determines the pass valve rule for considering protecting water hammer requirement, and the setting for accident valve event after pump provides foundation, has very big application prospect.
Description
Technical field
The invention belongs to behind hydraulic and hydroelectric engineering field more particularly to a kind of high lift water-carriage system termination of pumping accident pump of determination
The method of valve Closing Law.
Background technique
Valve is various, cheap, easy to operate, safe and reliable due to having many advantages, such as pattern, and is widely used in
In the flow adjusting and waterpower control of water-carriage system.Reasonable valve operation can effectively reduce transient process harm, so valve
Door movement rule optimization becomes an important content of transient process calculation research.
For water delivery by gravity flow system, valve event is the main reason for generating water hammer, as long as theoretically valve operation obtains
When, that is, it can guarantee system safety, so the determination of valve event rule is relatively easy, as long as enabling valve event slow enough, i.e.,
It is able to satisfy the requirement of Con trolling index.
For Pressurized Water Delivery System, the water pump loss of power accident of drawing water is the main reason for leading to water flow impulsion, at this time for
Meet system cutout and water pump reverses the requirement of revolving speed control, usually check-valves or butterfly valve need to close after pump, at this time water hammer
By valve event and the joint effect of water pump, this makes the determination for pumping late gate movement rule become more difficult.
Currently, primarily determining valve event rule based on previous studies experience, then tried by zooming valve rule is closed
Adjustment and optimization are calculated, is the main method for determining pump late gate optimal valve Rule adjusting.But this method is due to lacking theory analysis
And guidance, there is certain blindness, cause required computationally intensive, time-consuming and laborious.
Summary of the invention
Goal of the invention: in view of the above problems, the present invention proposes valve after a kind of high lift water-carriage system termination of pumping accident pump of determination
The method of door Closing Law is based on high lift water-carriage system pump-stopping water hammer characteristic, simple and quick to determine to consider that protecting water hammer is wanted
The termination of pumping accident pump late gate Closing Law asked.
Technical solution: to achieve the purpose of the present invention, the technical scheme adopted by the invention is that: a kind of high lift of determination is defeated
The method that water system termination of pumping accident pumps late gate Closing Law, comprising steps of
(1) for meeting the high lift water-carriage system of condition, the numerical simulation calculation in the case of valve tripping is carried out, is obtained
Cross valve flow changing curve；
(2) valve flow Q was chosentInitial effects moment t at the time of=0, as valve closing；
(3) the valve waterhead fall excessively of initial effects moment t
Wherein,It is τ for t moment valve openingtUnder cross valve waterhead fall；Q0For under incipient stability operating condition
Cross valve flow；ξ0Valve waterhead fall is crossed when for incipient stability operating condition lower valve being full-gear；QtFor valve pass
The initial effects moment t closed is corresponding to cross valve flow；
(4) the overcurrent characteristic curve for searching valve crosses valve waterhead fall according to t momentObtain t moment valve
Door aperture τt；
(5) basis:
It can obtain, pump the Closing Law of late gate are as follows:
Wherein, tIt closesIt is closed for one section of straight line total shut-in time of valve, t is initial effects moment, τtFor t moment valve opening.
In the step 1, condition that Gao Yangcheng water-carriage system need to meet are as follows:
Wherein, HBTo be discharged pool water level, HUFor pool water level of intaking, a is water hammer wave velocity, and g is acceleration of gravity, and A cuts for main pipe
Area, QT0For the main pipe total flow under incipient stability operating condition.
In the step 2, water-carriage system pump late gate should be avoided the initial effects moment and cross valve flow and be positive, if valve is closed
Relatively slow, the initial effects moment that valve is closed is later, crosses valve flow and is negative, then valve closing will cause refluence flow to reduce, from
And downstream pressure is caused to rise, therefore selecting the initial effects moment to cross the refluence flow of valve should be smaller.
In the step 3, the valve head loss of crossing that valve closes the initial effects moment is equal under incipient stability operating condition
Cross valve head loss.
The utility model has the advantages that the present invention can provide foundation for the setting of accident valve event after pump, compared in the past by passing through
It tests and primarily determines valve event rule, then by zooming to the method for closing valve rule progress tentative calculation adjustment and optimization, due to omitting
Cumbersome numerical simulation calculation, and more efficient quick have very big scientific research and practical application value.
Detailed description of the invention
Fig. 1 is system arrangement schematic diagram；
Fig. 2 is pump late gate overcurrent performance diagram；
Valve changes in flow rate figure is crossed when Fig. 3 is valve tripping obtained by numerical simulation calculation；
Fig. 4 is pressure change comparison diagram when valve is closed in valve tripping and 0.865s before and after valve；
Fig. 5 is the variation comparison diagram that valve flow is crossed when valve is closed in valve tripping and 0.865s.
In the figure, it is marked as intake pool 1, water pump 2 pump late gate 3, discharge bay 4, height datum 5.
Specific embodiment
Further description of the technical solution of the present invention with reference to the accompanying drawings and examples.
The method of the high lift water-carriage system termination of pumping accident pump late gate Closing Law of determination of the present invention, including step
It is rapid:
(1) for meeting the high lift water-carriage system of condition, the numerical simulation calculation in the case of valve tripping is carried out, is obtained
Cross valve flow changing curve.
The condition that high lift water-carriage system need to meet are as follows:
Wherein, HBTo be discharged pool water level, HUFor pool water level of intaking, a is water hammer wave velocity, and g is acceleration of gravity, and A cuts for main pipe
Area, QT0For the main pipe total flow under incipient stability operating condition；
(2) by valve flow changing curve excessively it is found that if valve is closed comparatively fast, the initial effects moment that valve is closed is more early,
It crosses valve flow at this time to be positive, then valve closing will cause positive stream flow to reduce, to will lead to downstream pressure decline, be unfavorable for pipe
The Negative pressure prevention in road.In view of water pump rotates forward at this time, it can satisfy water pump and reverse the control requirement of revolving speed, therefore should be avoided initial
The influence moment crosses valve flow and is positive.
If valve closing is slower, the initial effects moment that valve is closed is later, crosses valve flow at this time and is negative, then valve is closed
It will cause to flow backwards flow reduction, and to will lead to downstream pressure rising, need to prevent pipeline from booster, therefore initial effects moment occurs
The refluence flow for crossing valve should be smaller.
Therefore chose valve flow QtInitial effects moment t at the time of=0, as valve closing；
(3) the valve head loss excessively that valve closes the initial effects moment, which should be equal under incipient stability operating condition, crosses valve water
Head loss, the initial effects moment t closed according to valve and corresponding valve flow Q excessivelyt=0, can acquire t moment crosses valve water
Head loss coefficient
Wherein,It is τ for t moment valve openingtUnder cross valve waterhead fall；Q0For under incipient stability operating condition
Cross valve flow；ξ0Valve waterhead fall is crossed when for incipient stability operating condition lower valve being full-gear；QtFor valve pass
The initial effects moment t closed is corresponding to cross valve flow；
(4) the overcurrent characteristic curve for searching valve crosses valve waterhead fall according to t momentObtain t moment valve
Door aperture τt；
(5) basis:
It can obtain, pump the Closing Law of late gate are as follows:
Wherein, tIt closesIt is closed for one section of straight line total shut-in time of valve, t is initial effects moment, τtFor t moment valve opening.
The method of the present invention is illustrated below by way of a specific embodiment.
Table 1
Certain high lift water-carriage system such as Fig. 1, parametric statistics is as shown in table 1, and pump late gate crosses properties of flow such as Fig. 2.Due to logical
It crosses and is calculated to meet the high lift water-carriage system of condition:
Therefore it is applicable in the Closing Law present invention determine that termination of pumping accident pump late gate.
By numerical simulation calculation, valve changes in flow rate such as Fig. 3 excessively in the case of valve tripping can be obtained.As seen from the figure, at that time
Between be 0.865s when, cross valve flow Qt=0, therefore taking the moment is the initial effects moment that valve is closed.
According to the condition that the initial effects moment need to meet, valve waterhead fall is crossed at this time are as follows:
By checking that the valve of Fig. 2 crosses properties of flow, this is crossed valve waterhead fall and corresponds to valve opening 0, therefore valve after pump
The shut-in time of door are as follows:
Pump numerical simulation calculation result such as Fig. 4 and Fig. 5 that mono- section of straight line of late gate 0.865s is closed.It can by Fig. 4 and Fig. 5
Know, valve is closed with the rate, although the closing of valve is small when causing stress minimum compared with valve tripping, pressure maximum is refused compared with valve
It is big when dynamic, but within the scope of pipeline pressure-bearing, therefore identified pass valve rule is feasible.
To sum up, determination proposed by the invention, which soars the method that journey water-carriage system termination of pumping accident pumps late gate Closing Law, is
Feasible, required calculation amount is smaller, has very high convenience.
Claims (4)
1. a kind of method for determining high lift water-carriage system termination of pumping accident pump late gate Closing Law, which is characterized in that including step
It is rapid:
(1) for meeting the high lift water-carriage system of condition, the numerical simulation calculation in the case of valve tripping is carried out, valve is obtained
Flow changing curve；
(2) valve flow Q was chosentInitial effects moment t at the time of=0, as valve closing；
(3) the valve waterhead fall excessively of initial effects moment t
Wherein,It is τ for t moment valve openingtUnder cross valve waterhead fall；Q0For the mistake under incipient stability operating condition
Valve flow；ξ0Valve waterhead fall is crossed when for incipient stability operating condition lower valve being full-gear；QtIt is closed for valve
Initial effects moment t is corresponding to cross valve flow；
(4) the overcurrent characteristic curve for searching valve crosses valve waterhead fall according to t momentObtain t moment valve opening
τt；
(5) basis:
It can obtain, pump the Closing Law of late gate are as follows:
Wherein, tIt closesIt is closed for one section of straight line total shut-in time of valve, t is initial effects moment, τtFor t moment valve opening.
2. the method for the high lift water-carriage system termination of pumping accident pump late gate Closing Law of determination according to claim 1,
It is characterized in that, in the step 1, condition that Gao Yangcheng water-carriage system need to meet are as follows:
Wherein, HBTo be discharged pool water level, HUFor pool water level of intaking, a is water hammer wave velocity, and g is acceleration of gravity, and A is main pipe section
Product, QT0For the main pipe total flow under incipient stability operating condition.
3. the method for the high lift water-carriage system termination of pumping accident pump late gate Closing Law of determination according to claim 1,
It is characterized in that, in the step 2, water-carriage system pump late gate should be avoided the initial effects moment and cross valve flow and be positive, if valve closes
It closes relatively slowly, the initial effects moment that valve is closed is later, crosses valve flow and is negative, then valve closing will cause to flow backwards flow reduction,
So as to cause downstream pressure rising, therefore selecting the initial effects moment to cross the refluence flow of valve should be smaller.
4. the method for the high lift water-carriage system termination of pumping accident pump late gate Closing Law of determination according to claim 1,
It is characterized in that, in the step 3, the valve head loss of crossing that valve closes the initial effects moment is equal under incipient stability operating condition
Cross valve head loss.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910331645.6A CN110043744B (en) | 2019-04-24 | 2019-04-24 | Method for determining valve closing rule after pump failure of high-lift water delivery system |
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| CN201910331645.6A CN110043744B (en) | 2019-04-24 | 2019-04-24 | Method for determining valve closing rule after pump failure of high-lift water delivery system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112594554A (en) * | 2020-12-09 | 2021-04-02 | 河海大学 | Valve operation method for solving problem of overlarge positive pressure of high-lift water delivery system |
| CN113705120A (en) * | 2021-08-25 | 2021-11-26 | 山东省调水工程运行维护中心 | Method for formulating optimal regulation and control scheme of rear valve of water transfer engineering pump |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH123992A (en) * | 1926-11-27 | 1928-01-02 | Jean Lavanchy | Device for damping the shocks and vibrations occurring in pressure lines. |
| DE617502C (en) * | 1931-10-13 | 1935-08-21 | Joseph Heindorf | Water hammer |
| US3264485A (en) * | 1962-10-02 | 1966-08-02 | Hitachi Ltd | Methods and apparatus for preventing water hammer in tailrace or suction lines |
| CN202484515U (en) * | 2012-03-23 | 2012-10-10 | 中国市政工程西北设计研究院有限公司 | Protective device for forward water hammer |
| US20130103370A1 (en) * | 2011-10-20 | 2013-04-25 | Energy Solutions International, Inc. | Pipeline flow modeling method |
| CN105735421A (en) * | 2016-02-29 | 2016-07-06 | 河海大学 | Water hammer protection structure and method for reducing total volume of air tanks |
| CN106013319A (en) * | 2016-06-08 | 2016-10-12 | 河海大学 | Method for calculating limit runaway water hammer pressure of water supply system |
| WO2016204362A1 (en) * | 2015-06-19 | 2016-12-22 | (주)에스엠테크 | Water hammer prevention system using operation state analysis algorithm |
| CN106337989A (en) * | 2016-09-12 | 2017-01-18 | 西安航天动力试验技术研究所 | Manufacturing method of pipeline depressurization device |
| CN106842928A (en) * | 2017-02-13 | 2017-06-13 | 中国水利水电科学研究院 | The valve closing optimal control method of long range big flow water-carriage system transient process |
| CN107218470A (en) * | 2017-05-27 | 2017-09-29 | 河海大学 | For the novel airbag type protecting water hammer device in water supply line |
| CN208281693U (en) * | 2018-06-12 | 2018-12-25 | 彭亚卫 | A kind of water hammer elimination tank |
-
2019
- 2019-04-24 CN CN201910331645.6A patent/CN110043744B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH123992A (en) * | 1926-11-27 | 1928-01-02 | Jean Lavanchy | Device for damping the shocks and vibrations occurring in pressure lines. |
| DE617502C (en) * | 1931-10-13 | 1935-08-21 | Joseph Heindorf | Water hammer |
| US3264485A (en) * | 1962-10-02 | 1966-08-02 | Hitachi Ltd | Methods and apparatus for preventing water hammer in tailrace or suction lines |
| US20130103370A1 (en) * | 2011-10-20 | 2013-04-25 | Energy Solutions International, Inc. | Pipeline flow modeling method |
| CN202484515U (en) * | 2012-03-23 | 2012-10-10 | 中国市政工程西北设计研究院有限公司 | Protective device for forward water hammer |
| WO2016204362A1 (en) * | 2015-06-19 | 2016-12-22 | (주)에스엠테크 | Water hammer prevention system using operation state analysis algorithm |
| CN105735421A (en) * | 2016-02-29 | 2016-07-06 | 河海大学 | Water hammer protection structure and method for reducing total volume of air tanks |
| CN106013319A (en) * | 2016-06-08 | 2016-10-12 | 河海大学 | Method for calculating limit runaway water hammer pressure of water supply system |
| CN106337989A (en) * | 2016-09-12 | 2017-01-18 | 西安航天动力试验技术研究所 | Manufacturing method of pipeline depressurization device |
| CN106842928A (en) * | 2017-02-13 | 2017-06-13 | 中国水利水电科学研究院 | The valve closing optimal control method of long range big flow water-carriage system transient process |
| CN107218470A (en) * | 2017-05-27 | 2017-09-29 | 河海大学 | For the novel airbag type protecting water hammer device in water supply line |
| CN208281693U (en) * | 2018-06-12 | 2018-12-25 | 彭亚卫 | A kind of water hammer elimination tank |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112594554A (en) * | 2020-12-09 | 2021-04-02 | 河海大学 | Valve operation method for solving problem of overlarge positive pressure of high-lift water delivery system |
| CN112594554B (en) * | 2020-12-09 | 2021-11-12 | 河海大学 | Valve operation method for solving problem of overlarge positive pressure of high-lift water delivery system |
| CN113705120A (en) * | 2021-08-25 | 2021-11-26 | 山东省调水工程运行维护中心 | Method for formulating optimal regulation and control scheme of rear valve of water transfer engineering pump |
| CN113705120B (en) * | 2021-08-25 | 2023-09-22 | 山东省调水工程运行维护中心 | Method for formulating optimal regulation and control scheme of back valve of water diversion engineering pump |
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| CN110043744B (en) | 2020-06-16 |
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