CN103603409B - Method for stopping pumps in well cluster water supply system by means of cooperated action of pumps and flow regulating valve - Google Patents
Method for stopping pumps in well cluster water supply system by means of cooperated action of pumps and flow regulating valve Download PDFInfo
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- CN103603409B CN103603409B CN201310643296.4A CN201310643296A CN103603409B CN 103603409 B CN103603409 B CN 103603409B CN 201310643296 A CN201310643296 A CN 201310643296A CN 103603409 B CN103603409 B CN 103603409B
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Abstract
The invention relates to a method for stopping pumps in a well cluster water supply system by means of the cooperated action of the pumps and a flow regulating valve. The method for stopping the pumps in the well cluster water supply system by means of the cooperated action of the pumps and the flow regulating valve comprises the steps that the well cluster water supply system which comprises the N water source water pumps, N multifunctional water pump control valves, a main water delivering pipe, the flow regulating valve, a water pool and a computer monitoring system is established; the pump stopping time interval t0 of the water source water pumps is determined according to the closing times t of the multifunctional water pump control valves, the action-in-advance time T0 of the flow regulating valve is determined according to the closing times t of the multifunctional water pump control valves and the number N of the water source water pumps, and the closing time T of the flow regulating valve and the total pump stopping time T1 of the N water source water pumps are determined according to the pump stopping time interval t0 and the action-in-advance time T0 of the flow regulating valve; all the water source water pumps are stopped one by one from the Nth water source water pump to the first water source water pump in the closing process of the flow regulating valve according to the pump stopping time interval t0, the closing time T of the flow regulating valve and the action-in-advance time T0 of the flow regulating valve, wherein the pump stopping time interval t0, the closing time T of the flow regulating valve and the action-in-advance time T0 of the flow regulating valve are obtained through calculation. The method can be widely applied to well cluster water supply systems.
Description
Technical field
The present invention relates to a kind of termination of pumping method in gang of wells water system, particularly about a kind of termination of pumping method of water pump and flow regulating valve interoperation in gang of wells water system.
Background technology
Work and the multiple stage water pump long distance gang of wells water system that coordinates main end flow regulating valve to control the water yield for having multiple stage water pump, existing termination of pumping method has two kinds: (1) first closes the termination of pumping again of end flow regulating valve simultaneously; (2) end flow regulating valve is closed in first termination of pumping again.For method (1), although be full of water in pipeline after termination of pumping can be ensured, when avoiding supply water next time, water pump blank pipe starts, but this method can cause part water pump assembly long-play at dead point, pass, thus makes the temperature sharply raised caused by the high-speed friction between impeller and current finally destroy the shaft seal of water pump assembly; Also likely there is pipe explosion accident because of water hammer simultaneously.And for method (2), although water pump long-play can be avoided at dead point, pass, but easily cause the pipeline separation of flow of local high spot position, the water column caused under condition of negative pressure is broken, water undergoes phase transition and is steam state, thus likely generation pipeline cavitation and cutout water column make the problem of water hammer again up; The blank pipe phenomenon that the separation of flow simultaneously causes can strengthen the workload of pipeline air exhaust water when supplying water next time.Therefore, existing termination of pumping method often causes the generation of pump-stopping water hammer accident in gang of wells water system.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of termination of pumping method of water pump and flow regulating valve interoperation in simple, reliable gang of wells water system.
For achieving the above object, the present invention takes following technical scheme: a kind of termination of pumping method of water pump and flow regulating valve interoperation in gang of wells water system, and it comprises the following steps: 1) arrange the gang of wells water system that comprises N platform water head site water pump, N number of water pump multifunctional control valve, a water delivery main pipeline, a flow regulating valve, a pond and a computer supervisory control system; 2) the termination of pumping time interval t of each water head site water pump is calculated according to the shut-in time t of water pump multifunctional control valve
0for: t
0=kt, in formula, k is time coefficient, and its span is: 0≤k≤1; Flow regulating valve advancement time T is calculated according to the shut-in time t of water pump multifunctional control valve and the number of units N of water head site water pump
0for:
In formula, x is constant coefficient, and its span is: 1400≤x≤1600; According to termination of pumping time interval t
0with flow regulating valve advancement time T
0calculate the termination of pumping total time T of flow regulating valve shut-in time T and N platform water head site water pump
1be respectively:
T＝T
0+(N-1)(t+t
0)，
T
1＝T
0+Nt+(N-1)t
0；
3) in flow regulating valve closing process, according to step 2) the termination of pumping time interval t that calculates
0, flow regulating valve shut-in time T and N platform water head site water pump termination of pumping total time T
1, stop each water head site water pump from N platform water head site water pump one by one to First water head site water pump, it specifically comprises the following steps: (1) computer supervisory control system adopts driven by power mode at initial time t
sstart linearly to close flow regulating valve, after flow regulating valve shut-in time T, at t
s+ T the moment closes flow regulating valve completely; (2) in flow regulating valve shut-in time T, according to the distance of each water head site water pump to flow regulating valve, stop each water head site water pump from N platform water head site water pump one by one to First water head site water pump, it specifically comprises the following steps: 1. at t
s+ T
0moment First water head site water pump power down, first water pump multifunctional control valve that First water head site water pump connects relies on himself inlet and outlet pressure difference to start to close, at t
s+ T
0+ t first water pump multifunctional control valve is fully closed, and namely First water head site water pump quits work; 2. at t
s+ T
0+ t+t
0moment second water head site water pump power down, second water pump multifunctional control valve of second water head site water pump connection relies on himself inlet and outlet pressure difference to start to close, at t
s+ T
0+ 2t+t
0moment, second water pump multifunctional control valve was fully closed, and namely second water head site water pump quits work; 3. repeat step 1. ~ 2. in switch off the pump multifunctional control valve and stop the process of water head site water pump, until t
s+ T
0+ (N-1) t+ (N-1) t
0in the moment, N number of water pump multifunctional control valve that N platform water head site water pump connects relies on himself inlet and outlet pressure difference to start to close, at t
s+ T
0+ Nt+ (N-1) t
0moment, N number of water pump multifunctional control valve was fully closed, and namely N platform water head site water pump quits work; (3) according to step (1) and step (2), when N number of water pump multifunctional control valve starts to close, computer supervisory control system adopts driven by power mode to control flow regulating valve and has just cut out.
In described step 1), N platform water head site water pump is connected on water delivery main pipeline in serial or parallel connection mode respectively by N number of water pump multifunctional control valve.
The present invention is owing to taking above technical scheme, and it has the following advantages: 1, the present invention is due to according to the shut-in time t of water pump multifunctional control valve and the number of units N of water head site water pump, calculates termination of pumping time interval t
0, flow regulating valve advancement time T
0, flow regulating valve shut-in time T and N platform water head site water pump termination of pumping total time T
1equal time parameter, in flow regulating valve closing process, according to the time parameter calculated, each water head site water pump is stopped one by one to First water head site water pump from N platform water head site water pump, therefore in termination of pumping process the present invention can avoid each water head site water pump long-play pass dead point, and can reduce because of cutout cause water steam state phase transformation and close valve cause high pressure water hammer harm.2, the present invention controls flow regulating valve owing to adopting computer supervisory control system, when making N number of water pump multifunctional control valve start to close, flow regulating valve has been closed just, and therefore the present invention can ensure after termination of pumping, be full of water in water delivery main pipeline, thus reduce the process that next time opens pump priming.Based on above advantage, the present invention can be widely used in gang of wells water system.
Accompanying drawing explanation
Fig. 1 is gang of wells water system structural representation of the present invention
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in detail.
The present invention realizes based on gang of wells water system, and as shown in Figure 1, gang of wells water system comprises N platform water head site water pump 1, N number of water pump multifunctional control valve 2, water delivery main pipeline 3, flow regulating valve 4, pond 5 and a computer supervisory control system 6.N platform water head site water pump 1 is separately positioned in water head site gang of wells, and be connected on water delivery main pipeline 3 respectively by N number of water pump multifunctional control valve 2 in serial or parallel connection mode, the end of water delivery main pipeline 3 connects the pond 5 being positioned at gang of wells water system downstream by flow regulating valve 4, computer supervisory control system 6 controls the valve event of flow regulating valve 4.According to each water head site water pump 1 to the distance of flow regulating valve 4, the numbering from 1# to N# is carried out to each water head site water pump 1.
In gang of wells water system of the present invention, the termination of pumping method of water pump and flow regulating valve interoperation comprises the following steps:
1) the gang of wells water system that comprises N platform water head site water pump 1, N number of water pump multifunctional control valve 2, water delivery main pipeline 3, flow regulating valve, 4, pond 5 and a computer supervisory control system 6 is set.Wherein, N platform water head site water pump 1 is connected on water delivery main pipeline 3 in serial or parallel connection mode respectively by N number of water pump multifunctional control valve 2.
2) the termination of pumping time interval t of each water head site water pump 1 is determined according to the shut-in time t of water pump multifunctional control valve 2
0, determine flow regulating valve 4 advancement time T according to the shut-in time t of water pump the multifunctional control valve 2 and number of units N of water head site water pump 1
0, according to termination of pumping time interval t
0with flow regulating valve 4 advancement time T
0determine the termination of pumping total time T of flow regulating valve 4 shut-in time T and N platform water head site water pump 1
1, it specifically comprises the following steps:
1. the termination of pumping time interval t of the water head site water pump 1 stopping each water pump multifunctional control valve 2 to connect is calculated according to the shut-in time t of selected water pump multifunctional control valve 2
0for:
t
0＝kt （1）
In formula (1), k is time coefficient, and its span is: 0≤k≤1.As k=0, termination of pumping time interval t
0=0, be nonseptate termination of pumping mode, i.e. minimum termination of pumping mode consuming time.For growing distance and the gang of wells water-carriage system rising and falling large, for reducing pump-stopping water hammer ripple to the impact of pumping station operation stability, suggestion k value is 1.
2. flow regulating valve 4 advancement time T is calculated according to the shut-in time t of selected water pump the multifunctional control valve 2 and number of units N of water head site water pump 1
0for:
In formula (2), x is constant coefficient, calculates determine that the span of x is: 1400≤x≤1600 according to conventional pumping plant Calculations of Hydraulic Transient.
3. according to termination of pumping time interval t
0with flow regulating valve 4 advancement time T
0calculate the termination of pumping total time T of flow regulating valve 4 shut-in time T and N platform water head site water pump 1
1be respectively:
T＝T
0+(N-1)(t+t
0) （3）
T
1＝T
0+Nt+(N-1)t
0 （4）
3) in flow regulating valve closing process, according to step 2) the termination of pumping time interval t that calculates
0, flow regulating valve 4 shut-in time T and N platform water head site water pump 1 termination of pumping total time T
1, stop each water head site water pump 1 from N platform water head site water pump 1 one by one to First water head site water pump 1, it specifically comprises the following steps:
(1) computer supervisory control system 6 adopts driven by power mode at initial time t
sstart linear closedown flow regulating valve 4, after flow regulating valve 4 shut-in time T, at t
s+ T the moment closes flow regulating valve 4 completely.
(2) in flow regulating valve 4 shut-in time T, according to the distance of each water head site water pump 1 to flow regulating valve 4, adopt the order (namely from N platform water head site water pump 1 to First water head site water pump 1) of " from bottom to top " to stop each water head site water pump 1 one by one, it specifically comprises the following steps:
1. at t
s+ T
0moment First water head site water pump 1 power down, first water pump multifunctional control valve 2 that First water head site water pump 1 connects relies on himself inlet and outlet pressure difference to start to close, through the shut-in time t of a water pump multifunctional control valve 2, namely at t
s+ T
0+ t first water pump multifunctional control valve 2 is fully closed, that is First water head site water pump 1 quits work.
2. through a termination of pumping time interval t
0, namely at t
s+ T
0+ t+t
0moment second water head site water pump 1 power down, second water pump multifunctional control valve 2 of second water head site water pump 1 connection relies on himself inlet and outlet pressure difference to start to close, through the shut-in time t of a water pump multifunctional control valve 2, namely at t
s+ T
0+ 2t+t
0moment, second water pump multifunctional control valve 2 was fully closed, that is second water head site water pump 1 quits work.
3. repeat step 1. ~ 2. in switch off the pump multifunctional control valve 2 and stop the process of water head site water pump 1, until t
s+ T
0+ (N-1) t+ (N-1) t
0in the moment, N number of water pump multifunctional control valve 2 that N platform water head site water pump 1 connects relies on himself inlet and outlet pressure difference to start to close, through the shut-in time t of a water pump multifunctional control valve 2, namely at t
s+ T
0+ Nt+ (N-1) t
0moment, N number of water pump multifunctional control valve 2 was fully closed, that is N platform water head site water pump 1 quits work, thus N platform water head site water pump 1 is all quit work.
(3) according to step (1) and step (2), when N number of water pump multifunctional control valve 2 starts to close, computer supervisory control system 6 adopts driven by power mode to control flow regulating valve 4 and has just cut out.
Embodiment: the long distance gang of wells water system that comprises 12 water head site water pumps, 1,12 water pump multifunctional control valves, 2, water delivery main pipeline, 3, flow regulating valve 4 and a pond 5 is set.Wherein, 12 water head site water pumps 1 work simultaneously, and total water delivery flow of this gang of wells water system is 40000m
3/ d, the numbering of carrying out to the distance of flow regulating valve 4 from 1# to 12# to each water head site water pump 1 according to each water head site water pump 1.During normal work, in 12 water head site water pumps 1, pump discharge rated pressure is minimum is 79.5 × 10
3mmH
2o.Each water pump multifunctional control valve 2 all adopts shut-in time t to be the two benches Closing Law of 60s, and wherein, quick closing valve 25s to 30% aperture, closes 35s to 0 aperture slowly.Adopt the termination of pumping method of water pump and flow regulating valve interoperation in gang of wells water system of the present invention, it comprises the following steps:
1) termination of pumping time interval t is calculated
0, flow regulating valve 4 advancement time T
0, a flow regulating valve 4 shut-in time T and 12 water head site water pump 1 termination of pumping total time T
1.
1. according to the shut-in time t=60s of water pump multifunctional control valve 2, take into account the time cost of termination of pumping and the operation stability of pumping plant, time coefficient k is set as k=0.5, then the termination of pumping time interval t of each water head site water pump 1
0for:
t
0＝kt＝0.5×60s＝30s。
2. selected constant coefficient x=1500, according to the shut-in time t=60s of water pump multifunctional control valve 2, the number of units N=12 of water head site water pump 1 and constant coefficient x, determines flow regulating valve 4 advancement time T
0for:
3. according to termination of pumping time interval t
0with flow regulating valve 4 advancement time T
0, through type (3) and formula (4) calculate the termination of pumping total time T of a flow regulating valve 4 shut-in time T and 12 water head site water pump 1
1be respectively:
T＝T
0+(N-1)(t+t
0)＝300s+(12-1)×(60+30)s＝1290s，
T
1＝T
0+Nt+(N-1)t
0＝300s+12×60s+(12-1)×30s＝1350s。
2) each parameter obtained according to step 1) stops 12 water head site water pumps 1 respectively.
1. by initial time t
sbe set as 0, computer supervisory control system 6 adopts driven by power mode to start linearly to cut out flow regulating valve 4 in 0 moment, at the linear 300s closing flow regulating valve 4, the power down of First water head site water pump 1, the 1# water pump multifunctional control valve 2 that 1# water head site water pump 1 connects relies on himself inlet and outlet pressure difference to start to close, when 360s, 1# water pump multifunctional control valve 2 is fully closed, and namely 1# water head site water pump 1 quits work.
2. second water head site water pump 1 power down when 390s, the 2# water pump multifunctional control valve 2 that 2# water head site water pump 1 connects relies on himself inlet and outlet pressure difference to start to close, when 450s, 2# water pump multifunctional control valve 2 is fully closed, and namely 2# water head site water pump 1 quits work.
3. repeat step 1. ~ 2. in switch off the pump multifunctional control valve 2 and stop the process of water head site water pump 1, until during 1290s, the 12# water pump multifunctional control valve 2 that 12# water head site water pump 1 connects relies on himself inlet and outlet pressure difference to start to close, be fully closed at 1350s moment 12# water pump multifunctional control valve 2, namely 12# water head site water pump 1 quits work, thus 12 water head site water pumps 1 are all quit work, simultaneously when 12# water pump multifunctional control valve 2 starts to close during 1290s, the flow regulating valve 4 that computer supervisory control system 6 adopts driven by power mode to control has been closed just in closedown total time T.
Adopt termination of pumping method of the present invention, calculated by conventional pumping plant Calculations of Hydraulic Transient, the maximum pressure obtaining this gang of wells water system water-main is 70.9 × 10
3mmH
2o, minimum pressure is 0.9 × 10
3mmH
2o.Wherein, maximum pressure does not exceed 1.5 times of pump discharge rated pressure minimum value in selected 12 water head site water pumps 1, and minimum pressure is more than atmospheric pressure.Compared with existing termination of pumping method, the maximum pressure of this gang of wells water system water-main adopting termination of pumping method of the present invention to obtain have dropped 11%, and minimum pressure also brings up to more than atmospheric pressure by negative pressure.
Above-described embodiment is only for illustration of the present invention; the water head site water pump number wherein run, the Closing Law of water pump multifunctional control valve, the termination of pumping time interval and method step etc. all can change to some extent; every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.
Claims (1)
1. the termination of pumping method of water pump and flow regulating valve interoperation in gang of wells water system, it comprises the following steps:
1) the gang of wells water system that comprises N platform water head site water pump, N number of water pump multifunctional control valve, a water delivery main pipeline, a flow regulating valve, a pond and a computer supervisory control system is set; Described N platform water head site water pump is connected on described water delivery main pipeline respectively by described N number of water pump multifunctional control valve in serial or parallel connection mode, the end of described water delivery main pipeline connects described pond by described flow regulating valve, and described computer supervisory control system controls the valve event of described flow regulating valve;
2) the termination of pumping time interval t of each water head site water pump is calculated according to the shut-in time t of water pump multifunctional control valve
0for:
t
0＝kt，
In formula, k is time coefficient, and its span is: 0≤k≤1;
Flow regulating valve advancement time T is calculated according to the shut-in time t of water pump multifunctional control valve and the number of units N of water head site water pump
0for:
In formula, x is constant coefficient, and its span is: 1400≤x≤1600;
According to termination of pumping time interval t
0with flow regulating valve advancement time T
0calculate the termination of pumping total time T of flow regulating valve shut-in time T and N platform water head site water pump
1be respectively:
T＝T
0+(N-1)(t+t
0)，
T
1＝T
0+Nt+(N-1)t
0；
3) in flow regulating valve closing process, according to step 2) the termination of pumping time interval t that calculates
0, flow regulating valve shut-in time T and N platform water head site water pump termination of pumping total time T
1, stop each water head site water pump from N platform water head site water pump one by one to First water head site water pump, it specifically comprises the following steps:
(1) computer supervisory control system adopts driven by power mode at initial time t
sstart linearly to close flow regulating valve, after flow regulating valve shut-in time T, at t
s+ T the moment closes flow regulating valve completely;
(2) in flow regulating valve shut-in time T, according to the distance of each water head site water pump to flow regulating valve, stop each water head site water pump from N platform water head site water pump one by one to First water head site water pump, it specifically comprises the following steps:
1. at t
s+ T
0moment First water head site water pump power down, first water pump multifunctional control valve that First water head site water pump connects relies on himself inlet and outlet pressure difference to start to close, at t
s+ T
0+ t first water pump multifunctional control valve is fully closed, and namely First water head site water pump quits work;
2. at t
s+ T
0+ t+t
0moment second water head site water pump power down, second water pump multifunctional control valve of second water head site water pump connection relies on himself inlet and outlet pressure difference to start to close, at t
s+ T
0+ 2t+t
0moment, second water pump multifunctional control valve was fully closed, and namely second water head site water pump quits work;
3. repeat step 1. ~ 2. in switch off the pump multifunctional control valve and stop the process of water head site water pump, until t
s+ T
0+ (N-1) t+ (N-1) t
0in the moment, N number of water pump multifunctional control valve that N platform water head site water pump connects relies on himself inlet and outlet pressure difference to start to close, at t
s+ T
0+ Nt+ (N-1) t
0moment, N number of water pump multifunctional control valve was fully closed, and namely N platform water head site water pump quits work;
(3) according to step (1) and step (2), when N number of water pump multifunctional control valve starts to close, computer supervisory control system adopts driven by power mode to control flow regulating valve and has just cut out.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310643296.4A CN103603409B (en) | 2013-12-03 | 2013-12-03 | Method for stopping pumps in well cluster water supply system by means of cooperated action of pumps and flow regulating valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310643296.4A CN103603409B (en) | 2013-12-03 | 2013-12-03 | Method for stopping pumps in well cluster water supply system by means of cooperated action of pumps and flow regulating valve |
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| Publication Number | Publication Date |
|---|---|
| CN103603409A CN103603409A (en) | 2014-02-26 |
| CN103603409B true CN103603409B (en) | 2015-01-07 |
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|---|---|---|---|
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| JP2002188185A (en) * | 2000-12-19 | 2002-07-05 | Fujitsu Hitachi Plasma Display Ltd | Factory water supply system |
| CN102383466B (en) * | 2011-11-10 | 2014-03-12 | 渤海大学 | High-efficiency cluster type water pump system with constant pressure and variable flow and operation control method |
| CN102943502B (en) * | 2012-09-21 | 2014-02-12 | 刘定国 | Public ground source water and reclaimed water supply pipe network system of local ground-source heat pump system |
| CN203080594U (en) * | 2013-02-01 | 2013-07-24 | 天津大学 | Water supply system for flow device |
| CN203296108U (en) * | 2013-06-09 | 2013-11-20 | 黑龙江龙唐电力投资有限公司 | Water supply system using tap water pressure |
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