CN1818237A - High-efficient frequency-variable and speed-adjusting water supplying method with total flow and supplying apparatus thereof - Google Patents
High-efficient frequency-variable and speed-adjusting water supplying method with total flow and supplying apparatus thereof Download PDFInfo
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- CN1818237A CN1818237A CN 200610057595 CN200610057595A CN1818237A CN 1818237 A CN1818237 A CN 1818237A CN 200610057595 CN200610057595 CN 200610057595 CN 200610057595 A CN200610057595 A CN 200610057595A CN 1818237 A CN1818237 A CN 1818237A
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Abstract
This is a water supply method at entire flow rate and high efficient speed adjustment by frequency conversion. Divide the area into different districts in vertical first and figure out lift difference among the districts. Then decide the numbers and total flow rate of pumps in large capacity and small capacity. Set the pump's speed adjustment scopes and start-stop configures and restrict the low limits of pump's high frequency and pressure of pipe networks. The air pressing water supply tank, small capacity pump and large capacity pump are started in order, water flow rate changes from high to low, frequency conversion pumps are closed in order as the manner of large capacity pumps starting, running at decreasing frequency, small capacity pumps starting near to large ones low limitation, both large and small ones stop at reaching their low limitation. This method keeps the pumps working at high efficiency period during all water supply time and avoids repeating start and stop.
Description
(1) technical field
The present invention relates to a kind of frequency control supply method and equipment of fluid circulating system, particularly a kind of frequency control supply method and equipment that can be applicable to building water supply.
(2) background technology
Existing frequency conversion water supply facilities has the product of two kinds of class: first kind is early production, is characterized in being made up of 2 ~ 3 water pumps, and wherein 1 is adopted Frequency Converter Control, and other is general pump (not being subjected to Frequency Converter Control).When low discharge, frequency converter is devoted oneself to work, and power frequency descends, the water pump low-speed running, and when no lower-frequency limit value, frequency were low to moderate a certain value, water pump dallied, can not be to system water supply.When the system water amount strengthened gradually, power frequency gradually from low to high.Until 50Hz (also having) to Hz's more than 50, water pump also by low speed at a high speed until efficient operating point, along with the further increasing of water supply volume, can not satisfy the water requirement by the water pump output of Frequency Converter Control, then other water pump is devoted oneself to work, and these water pumps are generally in rated speed work.The shortcoming of this kind equipment is, all water pumps are 20% of not enough whole day of the period of efficient section work, and interior water pump of all the other times is not all in efficient section work, even idle running, therefore cause the waste of the energy, the frequency control water supply facilities that begins to be used for engineering the beginning of the nineties in last century belongs to this type mostly.At present, still have this type of production marketing on the market, cause the engineering water supply that adopts this kind equipment to have bigger energy waste, particularly some real estate projects, its management for infrastructure fee is high, and adopting this kind equipment is one of its major reason.According to investigations, some residential quarters only additional one of water rate can reach each household more than 50 yuan/month, the engineering of this kind equipment shows even has caused some professional person to think that frequency modulation water supply is not energy-conservation, less than water tank water pump associating way of supplying water, causes the effect of energy-saving and frequency-variable to be lost totally.
Second kind is the modified of frequency modulation water supply equipment, and some supply equipment manufacturers notice the disadvantage of traditional frequency conversion supply equipment, and the frequency conversion water supply facilities is improved.Main mode is as follows: supporting technology has had raising to a certain degree, as adopts the form of big or small pump combination to supply water, and equipment is established the small pneumatic jar, and several big pumps are standby each other, switch alternate run.This series products is compared with initial production, pump working has had raising to a certain degree in the period of efficient section, more energy-conservation than initial production, but mostly be the automatic control professional and technical personnel owing to be engaged in the technician of building service design research, state to water supply system work is not very understood, thereby, object function is not clear, corrective measure does not have specific aim, the efficient section of water pump there is not definition, frequency to the efficient operation current of electric does not define, so can't fundamentally solve the power saving of frequency control water supply facilities.
(3) summary of the invention
The purpose of this invention is to provide efficient frequency control water feeding method of a kind of full flow and equipment, solve the building water system and realize optimization problem by automatic control and converter technique, make the building water system in the All Time section (365 days, 24 hours) of water, the operating point of water pump is in its efficient section; And solve water pump start-stop, the problem that prolongs equipment life repeatedly avoid water system; Simultaneously, solve the problem that makes building water system " accurately water supply ", energy conservation.
Technical scheme one of the present invention:
The efficient frequency control water feeding method of this full flow comprises and sets water pump platform number, pump type, speed adjustable range, start and stop running parameter, operation and the adjusting water supply system of giving aqua region, it is characterized in that following steps are arranged:
Step (1), will intend feedwater building vertical division block, every district is equipped with a cover water supply facilities; Determine respectively to distinguish the minimum lift ∑ h of water supply facilities respectively
sWith H-Max ∑ h
LLift poor;
Step (2), poor according to the lift in the step (1) is selected the total total flow of joining pump platform number and large and small each pump type of each Qu;
(certain distinguishes big pump platform and counts N the design second flow amount Q=in certain district
L-1) * certain distinguishes big pump total flow Q
L
Certain distinguishes big pump total flow Q
L=A * certain is distinguished little pump platform and counts N
s* certain distinguishes little pump total flow Q
s
In the formula, A adjusts coefficient;
Make the H-Max ∑ h that respectively distinguishes water supply facilities
L＞respectively distinguish the minimum lift ∑ h of water supply facilities
s
Step (3), according to the flow that the pump platform is counted large and small each the pump type in He Ge district of joining in step (2) Zhong Ge district, determine the water pump platform number and the model in every district;
Step (4), the speed adjustable range of setting each water pump and start and stop running parameter, the efficient frequency lower limit (Hz) and the ductwork pressure that limit each water pump respectively set value;
Step (5), operation and adjusting water supply system;
1., when the water supply system flow equals zero and during nearly zero delivery, all water pumps do not move, air pressure tank supplies water;
2., when flow increases, when ductwork pressure was lower than setting value, little variable frequency pump started, system pressure is got back to setting value;
3., further increase when flow, when ductwork pressure was lower than setting value, big variable frequency pump started, and little variable frequency pump is closed, and system pressure is got back to setting value;
4., flow further increases, when ductwork pressure was lower than setting value, a general pump put into operation;
5., along with flow continue to increase, each general pump puts into operation gradually,
6., make the system pressure all-the-time stable the setting value, water system is in big flow water supply state;
7., water system by big flow water supply state to the low discharge state-transition that supplies water;
8., flow reduces gradually, ductwork pressure is greater than setting value, each general pump is closed gradually;
9., up to having only big variable frequency pump with power frequency operation;
10., along with the continuation of flow reduces, variable frequency pump increases with system pressure and reduces frequency and move, and makes system pressure remain on setting value;
, along with the continuation of flow reduces, when the pump frequency of big variable frequency pump during near " efficient frequency lower limit ", little variable frequency pump starts, the pump frequency of big variable frequency pump continues to reduce;
is along with the continuation of flow reduces, and big variable frequency pump is closed, and system supplies water with little variable frequency pump;
is along with the continuation of flow reduces, and little variable frequency pump reaches " efficient frequency lower limit ", and little variable frequency pump is closed, and system supplies water with air pressure tank, promptly is back to 1..
The efficient frequency control water supply facilities of this full flow, in building, vertically be divided at least one drainage area, be equipped with at least one big variable frequency pump, at least one little variable frequency pump and at least one general pump in every district, the interconnected one-tenth pipe network in each drainage area, it is characterized in that: be in series with air pressure tank in the pipe network, each big variable frequency pump, little variable frequency pump and general pump are connected in parallel in the pipe network respectively, above-mentioned each pump connects motor respectively, motor is electrically connected with variable-frequency governor through contactor respectively, and variable-frequency governor is electrically connected with three phase mains and industrial procedure controller again.
Technical scheme two of the present invention:
The efficient frequency control water feeding method of this full flow of scheme two comprises and sets water pump platform number, pump type, speed adjustable range, start and stop running parameter, operation and the adjusting water supply system of giving aqua region, it is characterized in that following steps are arranged:
Step (1), will intend feedwater building vertical division block, every district is equipped with a cover water supply facilities; Determine respectively to distinguish the minimum lift ∑ h of water supply facilities respectively
sWith H-Max ∑ h
LLift poor;
Step (2), poor according to the lift in the step (1) is selected the total total flow of joining pump platform number and large, medium and small each pump type of each Qu;
(certain distinguishes big pump platform and counts N the design second flow amount Q=in certain district
L-1) * certain distinguishes big pump total flow Q
L
Certain distinguishes big pump total flow Q
L(certain distinguishes little pump platform and counts N=A
M* certain distinguishes little pump total flow Q
M+ certain is distinguished little pump platform and counts N
s* certain distinguishes little pump total flow Q
s);
Certain distinguishes big pump total flow Q
M=A * certain is distinguished little pump platform and counts N
s* certain distinguishes little pump total flow Q
s
In the formula, A adjusts coefficient;
Make the H-Max ∑ h that respectively distinguishes water supply facilities
L＞respectively distinguish the minimum lift ∑ h of water supply facilities
M＞respectively distinguish the minimum lift ∑ h of water supply facilities
s
Step (3), according to the flow that the pump platform is counted large, medium and small each the pump type in He Ge district of joining in step (2) Zhong Ge district, determine the water pump platform number and the model in every district;
Step (4), the speed adjustable range of setting each water pump and start and stop running parameter, the efficient frequency lower limit (Hz) and the ductwork pressure that limit each water pump respectively set value;
Step (5), operation and adjusting water supply system;
1., when the water supply system flow equals zero and during nearly zero delivery, all water pumps do not move, air pressure tank supplies water;
2., when flow increases, when ductwork pressure was lower than setting value, little variable frequency pump started, system pressure is got back to setting value;
3., further increase when flow, when ductwork pressure was lower than setting value, big variable frequency pump started, and little variable frequency pump is closed, and system pressure is got back to setting value;
4., flow further increases, when ductwork pressure was lower than setting value, a general pump put into operation;
5., along with flow continue to increase, each general pump puts into operation gradually,
6., make the system pressure all-the-time stable the setting value, water system is in big flow water supply state;
7., water system by big flow water supply state to the low discharge state-transition that supplies water;
8., flow reduces gradually, ductwork pressure is greater than setting value, each general pump is closed gradually;
9., up to having only big variable frequency pump with power frequency operation;
10., along with the continuation of flow reduces, variable frequency pump increases with system pressure and reduces frequency and move, and makes system pressure remain on setting value;
, along with the continuation of flow reduces, when the pump frequency of big variable frequency pump during near " efficient frequency lower limit ", little variable frequency pump starts, the pump frequency of big variable frequency pump continues to reduce;
is along with the continuation of flow reduces, and big variable frequency pump is closed, and system supplies water with little variable frequency pump;
is along with the continuation of flow reduces, and little variable frequency pump reaches " efficient frequency lower limit ", and little variable frequency pump is closed, and system supplies water with air pressure tank, promptly is back to 1..
The efficient frequency control water supply facilities of this full flow of scheme two, in building, vertically be divided at least one drainage area, be equipped with at least one big variable frequency pump in every district, variable frequency pump at least one, at least one little variable frequency pump and at least one general pump, the interconnected one-tenth pipe network in each drainage area, it is characterized in that: be in series with air pressure tank in the pipe network, each big variable frequency pump, middle variable frequency pump; little variable frequency pump and general pump are connected in parallel in the pipe network respectively; above-mentioned each pump connects motor respectively; motor is electrically connected with variable-frequency governor through contactor respectively, and variable-frequency governor is electrically connected with three phase mains and industrial procedure controller again.
Principle of the present invention: the motor of frequency conversion speed adjusting pump is being lower than under certain rotating speed, and water pumping efficiency greatly reduces, and the rotation of motor at this moment just wastes electric energy, and this rotating speed is referred to as: " efficient frequency lower limit ".Therefore, pump motor must operate on the efficient frequency lower limit, effectively pump water.The efficient frequency lower limit is that disable motor is to save the key parameter of the energy.This parameter is relevant with flow, lift and actual used water situation in water system, must determine according to the actual conditions of engineering.The present invention at first will be optimized analysis to the flow of water system and lift and actual used water situation, determines the gross head loss value of water system, with water supply system reasonable in design be fit to the variable frequency pump of this water supply system, finally determines the efficient frequency lower limit.
Beneficial effect: the present invention is in the All Time section (365 days, 24 hours) of building water, and the operating point of water pump all is in its efficient section, has solved the problem of system optimization and energy conservation.The present invention can avoid the start-stop repeatedly of water pump, prolongs the application life of equipment.The present invention has broken through traditional water theory of giving, and can realize " accurately supplying water ", prevents the wasting of resources.The present invention proposes the power frequency lower limit of the efficient section work of water pump, and with this parameter as the control of pump start and stop.The present invention utilizes automatic control and converter technique, actual used water amount according to the building waterline network, the frequency modulation water supply method of preparation supply equipment and the water system of this method of realization, become traditional complying with " water configuration water pump during least favorable " and be " joining pump " according to actual used water, and realized each regional water supply flow overlap joint and lift overlap joint, guarantee that full flow, interior water pump of full time period are in efficient section work.Energy-saving effect is 25-40%.
The efficient frequency control water supply facilities of full flow of the present invention is the combination of air pressure tank, little variable frequency pump, big variable frequency pump, many general pumps.The increase of flow reduces hydraulic pressure, and air pressure tank, little variable frequency pump, big variable frequency pump, general pump are opened gradually, stablizes hydraulic pressure.Key of the present invention is that the flow minimizing increases hydraulic pressure, the process that general pump, big variable frequency pump, little variable frequency pump are closed gradually.Large and small variable frequency pump closes the selected use " efficient frequency lower limit " of close point.In case variable frequency pump reaches the efficient frequency lower limit and promptly carries out and close, use the next stage water supply installation, to save the energy.This high-rise building method of supplying water and the water supply facilities thereof that utilizes large and small variable frequency pump to combine with gas tank of the present invention both can be applicable to water supply system, also can be applicable to the building air-conditioner reclaimed water system.
(4) description of drawings
Fig. 1 is the operation block diagram of the efficient frequency control water feeding method of full flow of the present invention;
Fig. 2 is the system schematic of the efficient frequency control water supply facilities of full flow of the present invention embodiment.
Fig. 3 is a control principle block diagram of the present invention;
Fig. 4 is for embodiment of the invention operation and regulate the block diagram of water supply system.
Among the figure: variable frequency pump among 1-air pressure tank, the little variable frequency pump of 2-, the 3-, the big variable frequency pump of 4-, 5-general pump, 6-motor, 7-contactor, 8-variable-frequency governor, 9-industrial procedure controller, 10-three phase mains, 11-pipe network.
(5) specific embodiment
The concrete steps of the efficient frequency control water feeding method of full flow of the present invention are as follows:
Step (1), will intend feedwater building vertical division block, every district is equipped with a cover water supply facilities; Determine respectively to distinguish the minimum lift ∑ h of water supply facilities respectively
sWith H-Max ∑ h
LLift poor; According to the flow of water supply system and the possibility of lift and the optimization of actual used water status analysis.
The pipeline of generally speaking, frequency control water supply system is determined caliber by design second flow amount (maximum instantaneous flow) and by economic velocity.In fact, the period less than 20% that occurs design second flow amount in 24 hours every days, and the lift of system's pressurized equipment must satisfy water is the required lift of maximum instantaneous flow, all the other time periods more than 80%, the required lift of system all is lower than the most high-lift, and the system water amount is more little, and system pipeline is long more, then this lift difference is big more, and the lift formula of water pump is:
H＝h
0+Z+∑h
In the formula: H is a pump head;
h
0For free head with water spot, to domestic water system, consider the unlatching hydraulic pressure that some gas water heater is required, generally press 0.1MPa and calculate;
Z is the lowest water level of water storage tank of pump sump and the least favorable geometry discrepancy in elevation with water spot;
∑ h is the gross head loss of system, comprises the frictional head loss h of pipeline
fWith the h of local head loss
mSum.Be ∑ h=∑ h
f+ ∑ h
m
Wherein
In last two formulas: l is a pipe range
D is a caliber
V is a mean velocity in section
G is an acceleration of gravity
λ is the on-way resistance coefficient, is generally determined by experiment
ξ is the local resistance system, is generally determined by experiment
By last two formulas as can be seen, for promptly fixed pipe-line system, l big more (distance is long more), linear loss is big more, and flow Q is big more, and flow velocity v is also big more, and it is also big more along journey and local head loss.
Embodiment: certain residential quarters building area 400,000 m
2, Building totally 21 18～32 storey building vertically are divided into 3 districts, are supplied water by 3 cover frequency control water supply facilitiess respectively, and the design second flow amount in this three district is respectively 65.96l/s, 71.38l/s, 51.67l/s.This sub-district pump house is apart from about the least favorable water supply point pipeline length 800m.The H-Max that calculates the minimum lift of respectively distinguishing minimum discharge (zero delivery) and maximum stream flow (design second flow amount) is listed as follows:
Certain sub-district water supply system design parameters list of table 1
| Vertical division block | How much discrepancy in elevation Z | Design second flow amount | Minimum lift ∑ h s | H-Max ∑ h l | Lift difference ∑ h l-∑h s |
| One district, two～10 floor | 37m | 67.95l/s | 0.47MPa | 0.77MPa | 0.30MPa |
| Two districts, 11～20 floor | 67m | 71.38l/s | 0.77MPa | 1.0MPa | 0.23MPa |
| Three districts, 21～32 floor | 105m | 51.67l/s | 1.15MPa | 1.40MPa | 0.25MPa |
The head loss difference of maximum stream flow and minimum discharge is the optimization point in the last table.
Step (2), poor according to the lift in the step (1) is selected the total total flow of joining pump platform number and large and small each pump type of each Qu, selects to join the pump formula according to the ∑ h value of system.Join the pump formula and have two kinds:
First kind:
∑h
L＞∑h
S (5)
Second kind:
∑h
L＞∑h
M＞∑h
S (9)
Q design second flow amount in the formula
Q
L, Q
M, Q
SLarge, medium and small pump discharge
N
L, N
M, N
SThe platform number of large, medium and small pump
The coefficient that A is determined by the efficient frequency lower limit, ∑ h
L, ∑ h
M, ∑ h
SGross head loss during large, medium and small flow
First kind is joined the pump formula is large and small pump combination, and second kind is joined the pump formula is large, medium and small pump combination.The connotation of formula is that system reaches when designing the second flow amount, and middle or small pump is out of service, and big water supplying pump considers that simultaneously 1 big pump is standby.Little pump discharge stack (second kind of formula) equals 1 big pump discharge.Carry out the flow segmentation from zero delivery to designing the second flow amount, each flow section is calculated ∑ h, make and join the water pump combination that pump is realized the different flow section, and according to the selected pump head of the actual lift needs of each flow section, promptly low discharge low lift, big flow are high-lift.The water pump combination is used for the flow segmentation, and frequency control then is used for the flow fine setting of each flow section, makes 24 hours water supply pumps all in efficient section work like this.
For the little system of each day total water amount difference, recommend first kind of formula, feedwater can be adopted first kind of formula as dwelling house.
For each day system of differing greatly of total water amount, recommend second kind of formula, as the water of stadiums.
Step (3), according to the flow that the pump platform is counted large and small each the pump type in He Ge district of joining in step (2) Zhong Ge district, determine the water pump platform number and the model in every district; Join the pump formula and the segmentation flow is joined pump according to selected.
Selected join the pump formula after, join pump.The principle of joining pump is to realize the overlap joint of segmentation flow, can not join too many pump again.If when joining pump, do not carry out the flow overlap joint on request, just can't reach energy-conservation effect, too much if water pump is provided with the platform number, then control system is too complicated.Here the engineer who needs design experiences totally holds engineering.Fig. 2 is water pump configuration in the above-mentioned example, is to adopt first kind of formula to join pump:
The efficient frequency conversion water supply facilities configuration of certain sub-district full flow of table 2 list
| Vertical division block | Model of pump | Water pump platform number | The water pump parameter | The air pressure tank parameter | ||
| Q(l/s) | H(MPa) | N(kW) | ||||
| One district | 65DL×3 80DL×4 | 1 6 | 8.33 15 | 0.48 0.77 | 7.5 22 | φ1000 P＝1.0MPa |
| Two districts | 65DL×5 80DL×5 | 1 7 | 8.33 14 | 0.80 1.00 | 15 30 | φ1000 P＝1.0MPa |
| Three districts | 65DL×7 80DL×7 | 1 5 | 8.33 14 | 1.12 1.40 | 18.5 37 | φ1000 P＝1.6MPa |
Illustrate and analysis:
With 1 district is example, and this moment, little pump was joined 1, N
S=1, big 6 N of pump
L=6, in zero delivery during to 10l/s, by little water supplying pump, dwelling house water supply system for 4000 people use, situation when occurring zero delivery to 10l/s in one day is less, so needn't supply water by air pressure tank during zero delivery, arrive certain valve system pressure and descend; little pump startup; when flow system flow surpassed little pump discharge certain value, system pressure descended, 1 big pump startup converting operation; little pump cuts out; because the required lift of system is lower than big pump lift in order all to overlap again 1 little pump of polygamy, big pump in efficient frequency with interior than the low side operation, this moment, lift was lower; flow is also less, and (effect of frequency conversion; along with the increase of water supply volume, each water pump puts into operation gradually, until design second flow amount.Then along with the minimizing of water supply volume, the above-mentioned steps antikinesis.Frequency conversion coefficient A has played flow and the energy-conservation effect regulated at this moment.
Step (4), the speed adjustable range of setting each water pump and start and stop running parameter, the efficient frequency lower limit (Hz) and the ductwork pressure that limit each water pump respectively set value; According to the efficient district of supporting water pump, calculate the efficient frequency lower limit of each pump according to affinity law of pump, with the foundation of this lower limit as water pump control.
The present invention can guarantee that any period water pump all is operated in its efficient section.
Efficient section of water pump generally is meant within the scope of decrease in efficiency 5-7%, can find out on the performance diagram of water pump, and this efficient section is exactly the section of given maximum rated flow of water pump data and jot constant flow.In order to make water pump can be operated in efficient section, utilize the law of similitude (golden rule) to calculate the lower limit of water pump efficient frequency, as the foundation of water pump control.The golden rule formula is as follows:
Q---flow, H---lift, N---power, n---rotating speed, F---frequency
Calculate the efficient frequency lower limit of DL type and LG type water pump respectively according to above-mentioned formula.
Table 3 DL type water pump is at the speed adjustable range of efficient district's work and related parameter is arranged
Table 4 LG type water pump is at the speed adjustable range of efficient district's work and related parameter is arranged
Step (5), operation and regulate water supply system referring to Fig. 4:
1., when the water supply system flow equals zero and during nearly zero delivery, all water pumps do not move, air pressure tank supplies water;
2., when flow increases, when ductwork pressure was lower than setting value, little variable frequency pump started, system pressure is got back to setting value;
3., further increase when flow, when ductwork pressure was lower than setting value, big variable frequency pump started, and little variable frequency pump is closed, and system pressure is got back to setting value;
4., flow further increases, when ductwork pressure was lower than setting value, a general pump put into operation;
5., along with flow continue to increase, each general pump puts into operation gradually,
6., make the system pressure all-the-time stable the setting value, water system is in big flow water supply state;
7., water system by big flow water supply state to the low discharge state-transition that supplies water;
8., flow reduces gradually, ductwork pressure is greater than setting value, each general pump is closed gradually;
9., up to having only big variable frequency pump with power frequency operation;
10., along with the continuation of flow reduces, variable frequency pump increases with system pressure and reduces frequency and move, and makes system pressure remain on setting value;
, along with the continuation of flow reduces, when the pump frequency of big variable frequency pump during near " efficient frequency lower limit ", little variable frequency pump starts, the pump frequency of big variable frequency pump continues to reduce;
is along with the continuation of flow reduces, and big variable frequency pump is closed, and system supplies water with little variable frequency pump;
is along with the continuation of flow reduces, and little variable frequency pump reaches " efficient frequency lower limit ", and little variable frequency pump is closed, and system supplies water with air pressure tank, promptly is back to 1..
With 1 district's water supply system of listing in the table 2 is example:
This equipment water supply coverage is 0～67.95l/s, H=0.47～0.77MPa
The equipment configuration is as follows: 65DL * 1 on 3 water pumps (Q=8.33l/s H=48m N=7.5kW)
According to table 3, the efficient section of this pump operating frequency lower limit is 44.14Hz.
80DL * 6 on 4 water pumps (Q=15l/s H=77m N=22kW)
According to table 3, the efficient section of this pump operating frequency lower limit is 44.31Hz.
1 of φ 1000 air pressure tank (P=1.0MPa).
System running state is referring to Fig. 4:
When zero delivery and nearly zero delivery, all water pumps do not move, and gas tank supplies water, and when flow increases, when the terminal teletransmission pressure gauge reading of pipe network is lower than 0.05MPa, enter next program (little pump startup);
The 65DL pump frequency conversion starts, and along with the increase of flow, when the terminal teletransmission pressure gauge reading of pipe network is lower than 0.05MPa, enters next program;
The 80DL pump frequency conversion starts (behind 5～10s, the 65DL pump cuts out), and along with flow increases, when the terminal teletransmission pressure gauge reading of pipe network was lower than 0.05MPa, the 2nd 80DL water pump put into operation.Then, flow increases, the 3rd, the 4th, the 5th water pump put into operation gradually (illustrate that this example is joined 6 80DL pumps, wherein 5 are satisfied design second flow amounts, and 1 standby, and these 6 pump follow procedures circulate and devote oneself to work, make its working time roughly the same);
Along with flow reduces, the teletransmission pressure gauge reading is greater than 0.15MPa, and the 80DL water pump cuts out gradually, up to having only 1 80DL pump operation;
Along with flow reduces, the operation of 80DL pump frequency conversion when this pump frequency is lower than 44.31Hz (also can be made as 45Hz), enters next program;
The 65DL water pump cuts out, and air pressure tank supplies water; Repeat said process.
Claims (4)
1. the efficient frequency control water feeding method of full flow comprises and sets water pump platform number, pump type, speed adjustable range, start and stop running parameter, operation and the adjusting water supply system of giving aqua region, it is characterized in that following steps are arranged:
Step (1), will intend feedwater building vertical division block, every district is equipped with a cover water supply facilities; Determine respectively to distinguish the minimum lift ∑ h of water supply facilities respectively
sWith H-Max ∑ h
LLift poor;
Step (2), poor according to the lift in the step (1) is selected the total total flow of joining pump platform number and large and small each pump type of each Qu;
(certain distinguishes big pump platform and counts N the design second flow amount Q=in certain district
L-1) * certain distinguishes big pump total flow Q
L
Certain distinguishes big pump total flow Q
L=A * certain is distinguished little pump platform and counts N
s* certain distinguishes little pump total flow Q
s
In the formula, A adjusts coefficient;
Make the H-Max ∑ h that respectively distinguishes water supply facilities
L＞respectively distinguish the minimum lift ∑ h of water supply facilities
s
Step (3), according to the flow that the pump platform is counted large and small each the pump type in He Ge district of joining in step (2) Zhong Ge district, determine the water pump platform number and the model in every district;
Step (4), the speed adjustable range of setting each water pump and start and stop running parameter, the efficient frequency lower limit (Hz) and the ductwork pressure that limit each water pump respectively set value;
Step (5), operation and adjusting water supply system;
1., when the water supply system flow equals zero and during nearly zero delivery, all water pumps do not move, air pressure tank supplies water;
2., when flow increases, when ductwork pressure was lower than setting value, little variable frequency pump started, system pressure is got back to setting value;
3., further increase when flow, when ductwork pressure was lower than setting value, big variable frequency pump started, and little variable frequency pump is closed, and system pressure is got back to setting value;
4., flow further increases, when ductwork pressure was lower than setting value, a general pump put into operation;
5., along with flow continue to increase, each general pump puts into operation gradually,
6., make the system pressure all-the-time stable the setting value, water system is in big flow water supply state;
7., water system by big flow water supply state to the low discharge state-transition that supplies water;
8., flow reduces gradually, ductwork pressure is greater than setting value, each general pump is closed gradually;
9., up to having only big variable frequency pump with power frequency operation;
10., along with the continuation of flow reduces, variable frequency pump increases with system pressure and reduces frequency and move, and makes system pressure remain on setting value;
, along with the continuation of flow reduces, when the pump frequency of big variable frequency pump during near " efficient frequency lower limit ", little variable frequency pump starts, the pump frequency of big variable frequency pump continues to reduce;
is along with the continuation of flow reduces, and big variable frequency pump is closed, and system supplies water with little variable frequency pump;
is along with the continuation of flow reduces, and little variable frequency pump reaches " efficient frequency lower limit ", and little variable frequency pump is closed, and system supplies water with air pressure tank, promptly is back to 1..
2, the efficient frequency control water supply facilities of a kind of full flow, in building, vertically be divided at least one drainage area, be equipped with at least one big variable frequency pump, at least one little variable frequency pump and at least one general pump in every district, the interconnected one-tenth pipe network in each drainage area, it is characterized in that: be in series with air pressure tank in the pipe network, each big variable frequency pump, little variable frequency pump and general pump are connected in parallel in the pipe network respectively, above-mentioned each pump connects motor respectively, motor is electrically connected with variable-frequency governor through contactor respectively, and variable-frequency governor is electrically connected with three phase mains and industrial procedure controller again.
3. the efficient frequency control water feeding method of full flow comprises and sets water pump platform number, pump type, speed adjustable range, start and stop running parameter, operation and the adjusting water supply system of giving aqua region, it is characterized in that following steps are arranged:
Step (1), will intend feedwater building vertical division block, every district is equipped with a cover water supply facilities; Determine respectively to distinguish the minimum lift ∑ h of water supply facilities respectively
sWith H-Max ∑ h
LLift poor;
Step (2), poor according to the lift in the step (1) is selected the total total flow of joining pump platform number and large, medium and small each pump type of each Qu;
(certain distinguishes big pump platform and counts N the design second flow amount Q=in certain district
L-1) * certain distinguishes big pump total flow Q
L
Certain distinguishes big pump total flow Q
L(certain distinguishes little pump platform and counts N=A
M* certain distinguishes little pump total flow Q
M+ certain is distinguished little pump platform and counts N
s* certain distinguishes little pump total flow Q
s);
Certain distinguishes big pump total flow Q
M=A * certain is distinguished little pump platform and counts N
s* certain distinguishes little pump total flow Q
s
In the formula, A adjusts coefficient;
Make the H-Max ∑ h that respectively distinguishes water supply facilities
L＞respectively distinguish the minimum lift ∑ h of water supply facilities
M＞respectively distinguish the minimum lift ∑ h of water supply facilities
s
Step (3), according to the flow that the pump platform is counted large, medium and small each the pump type in He Ge district of joining in step (2) Zhong Ge district, determine the water pump platform number and the model in every district;
Step (4), the speed adjustable range of setting each water pump and start and stop running parameter, the efficient frequency lower limit (Hz) and the ductwork pressure that limit each water pump respectively set value;
Step (5), operation and adjusting water supply system;
1., when the water supply system flow equals zero and during nearly zero delivery, all water pumps do not move, air pressure tank supplies water;
2., when flow increases, when ductwork pressure was lower than setting value, little variable frequency pump started, system pressure is got back to setting value;
3., further increase when flow, when ductwork pressure was lower than setting value, big variable frequency pump started, and little variable frequency pump is closed, and system pressure is got back to setting value;
4., flow further increases, when ductwork pressure was lower than setting value, a general pump put into operation;
5., along with flow continue to increase, each general pump puts into operation gradually,
6., make the system pressure all-the-time stable the setting value, water system is in big flow water supply state;
7., water system by big flow water supply state to the low discharge state-transition that supplies water;
8., flow reduces gradually, ductwork pressure is greater than setting value, each general pump is closed gradually;
9., up to having only big variable frequency pump with power frequency operation;
10., along with the continuation of flow reduces, variable frequency pump increases with system pressure and reduces frequency and move, and makes system pressure remain on setting value;
, along with the continuation of flow reduces, when the pump frequency of big variable frequency pump during near " efficient frequency lower limit ", little variable frequency pump starts, the pump frequency of big variable frequency pump continues to reduce;
is along with the continuation of flow reduces, and big variable frequency pump is closed, and system supplies water with little variable frequency pump;
is along with the continuation of flow reduces, and little variable frequency pump reaches " efficient frequency lower limit ", and little variable frequency pump is closed, and system supplies water with air pressure tank, promptly is back to 1..
4, the efficient frequency control water supply facilities of a kind of full flow, in building, vertically be divided at least one drainage area, be equipped with at least one big variable frequency pump in every district, variable frequency pump at least one, at least one little variable frequency pump and at least one general pump, the interconnected one-tenth pipe network in each drainage area, it is characterized in that: be in series with air pressure tank in the pipe network, each big variable frequency pump, middle variable frequency pump; little variable frequency pump and general pump are connected in parallel in the pipe network respectively; above-mentioned each pump connects motor respectively; motor is electrically connected with variable-frequency governor through contactor respectively, and variable-frequency governor is electrically connected with three phase mains and industrial procedure controller again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB200610057595XA CN100419172C (en) | 2006-03-16 | 2006-03-16 | High-efficient frequency-variable and speed-adjusting water supplying method with total flow and supplying apparatus thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610057595XA CN100419172C (en) | 2006-03-16 | 2006-03-16 | High-efficient frequency-variable and speed-adjusting water supplying method with total flow and supplying apparatus thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN1818237A true CN1818237A (en) | 2006-08-16 |
| CN100419172C CN100419172C (en) | 2008-09-17 |
Family
ID=36918412
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|---|---|---|---|
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| CN2097855U (en) * | 1991-04-05 | 1992-03-04 | 唐海县自来水公司 | Multiplication type constant pressure variable automatic water supply device |
| US5522707A (en) * | 1994-11-16 | 1996-06-04 | Metropolitan Industries, Inc. | Variable frequency drive system for fluid delivery system |
| CN1216793A (en) * | 1997-10-30 | 1999-05-19 | 赵虎哲 | Variable-frequency, speed-regulation and constant pressure water supply equipment and method for high buildings |
| JP4393310B2 (en) * | 2004-08-25 | 2010-01-06 | 株式会社日立製作所 | Pump control device, pump control method, and pump control program |
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