CN102889664A - System and method for controlling water discharge - Google Patents
System and method for controlling water discharge Download PDFInfo
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- CN102889664A CN102889664A CN2011102021935A CN201110202193A CN102889664A CN 102889664 A CN102889664 A CN 102889664A CN 2011102021935 A CN2011102021935 A CN 2011102021935A CN 201110202193 A CN201110202193 A CN 201110202193A CN 102889664 A CN102889664 A CN 102889664A
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Abstract
The invention discloses a system and a method for controlling water discharge. The method for controlling water discharge comprises the following steps of: starting a water discharge control system; collecting a water discharge value inside a by-pass pipe in a secondary pump chilled water system of a central air conditioner, and a near-end pressure differential value and a far-end pressure differential value of a use side in the secondary pump chilled water system of the central air conditioner; determining the maximal near-end pressure differential set value of the user side; determining the near-end pressure differential set value of the user side; comparing the collected near-end pressure differential value with the determined near-end pressure differential set value, and adjusting operating parameters of the secondary pump on the basis of a comparison result, and finishing the adjusting process of the secondary pump. The operating parameters of the secondary pump can be adjusted by virtue of the system and the method for controlling water discharge, so that the water discharge in a water supply pipe of the user side in the chilled water system of the central air conditioner is adjusted; and the condition that the water discharge inside a water return pipe of the user side is not greater than that in the water supply pipe of a host side is ensured, and reverse backflow in the by-pass pipe is prevented finally.
Description
Technical field
The present invention relates to control system and method, relate in particular to a kind of water flow control system and method that is used in the conventional central air-conditioning secondary pump chilled water system.
Background technology
At present, the normal secondary pump variable flow system that adopts in the heavy construction freezing water system of central air conditioner.Fig. 1 has described freezing water system of central air conditioner of the prior art, referring to Fig. 1, cold water main unit one side (referred to as host computer side) 110 adopts the configuration of the corresponding constant speed pump of each main frame (being called again pump No. a time), guarantee the operation of handpiece Water Chilling Units constant flow, and air treatment system (referred to as user's side) 120 adopts velocity fluctuation pump (being called secondary pump) endways, according to the variation realization variable-flow operation of user's side load.Normally used secondary pump control method is pressure reduction control, and namely or far-end pressure reduction poor user's side water supply side pressure is as control variables, controls the rotating speed of secondary pump 160 by actual measured value relatively and setting value.According to desired design, the water yield of host computer side 110 in the feed pipe 130 of user's side 120 should be greater than the water yield of user's side 120 in the return pipe 140 of host computer side 110, and the backwater of user's side 120 should all flow back to main frame.But in actual motion, under existing secondary pump control method, the water yield in user's side return pipe 140 usually appears greater than the phenomenon of the water yield in the host computer side feed pipe 130, cause the part backwater in user's side return pipe 140 to mix with water in the host computer side feed pipe 130 via bypass pipe 150 (pipeline of UNICOM between feed pipe 130 and return pipe 140), this phenomenon is referred to as " reverse backflow ".The reverse backflow phenomenon makes the part backwater of user's side 120 mix with water in the host computer side feed pipe 130, improved the supply water temperature that flows to user's side 120, its consequence is under same user's side loading condiction, user's side airhandling equipment needs more output, and this has just increased the energy consumption of the secondary water pump 160 of user's side 120.If this phenomenon is not controlled, can cause user's side 120 water systems vicious circle to occur: supply water temperature raises, and user's side 120 needs the more water yield, and more user's side backwater is sneaked into user's side and supplied water, supply water temperature further raises, until secondary water pump 160 reaches maximum output.In the actual motion, when reverse backflow occured, the operator can increase by the operation number of units that increases cold water main unit the water yield of host computer side 110, thereby reduced and the elimination reverse backflow.Although the tradition solution can be eliminated reverse backflow, has additionally increased the energy consumption of cold water main unit and secondary water pump, has affected the energy efficiency of the integral body of central air conditioner system.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of water flow control system and method for the defective that is easy to occur reverse backflow in the central air-conditioning secondary pump chilled water system in the prior art in bypass pipe.
The technical solution adopted for the present invention to solve the technical problems is: a kind of water flow control system is provided, be used for the discharge in the control central air-conditioning secondary pump chilled water system bypass pipe, wherein, described water flow control system comprises flux and flow direction detector, flow restriction controller, pressure differential resetting value controller, secondary pump controller, far-end differential manometer and near-end differential manometer; Wherein,
Described flux and flow direction detector is arranged on the bypass pipe in the described central air-conditioning secondary pump chilled water system, and is electrically connected with described flow restriction controller;
Described far-end differential manometer be arranged on the waterpower index circuit of user's side in the described central air-conditioning secondary pump chilled water system end-equipment between the water return pipeline, and described near-end differential manometer be arranged on user's side between water end (W.E.) vibration means for main pipe for supplying water and the backwater supervisor; Wherein said far-end differential manometer is electrically connected with described pressure differential resetting value controller, and described near-end differential manometer is electrically connected with described secondary pump controller;
Described pressure differential resetting value controller is electrically connected with described flow restriction controller and described secondary pump controller respectively;
Described secondary pump controller is electrically connected with secondary pump in the described central air-conditioning secondary pump chilled water system.
The present invention also provides a kind of discharge control method, is used for the discharge in the control central air-conditioning secondary pump chilled water system bypass pipe, wherein, adopts water flow control system claimed in claim 1, carries out following steps:
S101, start described water flow control system;
Near-end pressure difference and the far-end pressure difference of user's side in current value in S102, the described freezing water system of central air conditioner of measurement in the bypass pipe and the flow direction and the described central air-conditioning secondary pump chilled water system;
The maximum near-end pressure differential resetting value of S103, the described user's side of setting;
The near-end pressure differential resetting value of S104, the described user's side of setting;
S105, the described near-end pressure difference that compares and measures and the described near-end pressure differential resetting value of determining, and the result adjusts the operational factor of secondary pump based on the comparison;
The adjustment process of S105, a secondary pump finishes, and returns described step S102.
The beneficial effect that the present invention produces is: according to actual near-end pressure reduction and the far-end pressure reduction of user's side in discharge actual in the bypass pipe in the discharge system acquisition secondary chilled water system of the present invention, the secondary chilled water system, and in conjunction with parameter preset, determine near-end pressure differential resetting value DP1
Set, and by the near-end pressure reduction DP1 that relatively gathers and the near-end pressure differential resetting value DP1 that determines
SetAdjust the operational factor of secondary pump.Thus by controlling the operational factor of the secondary pump in the central air-conditioning secondary chilled water system, thereby regulate the discharge in user's side feed pipe in the central air-conditioning secondary pump chilled water system, guarantee that discharge in user's side return pipe is not more than the discharge in the host computer side feed pipe, prevents the generation of reverse backflow in the bypass pipe.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation in the freezing water system of central air conditioner in the prior art;
Fig. 2 is the logic diagram of describing according to the water flow control system of the embodiment of the invention;
Fig. 3 is the flow chart of describing according to the execution in step of the execution discharge control method of the embodiment of the invention;
Fig. 4 describes time rate of change (dX/dt) according to the parameter X of the embodiment of the invention with discharge M
BpThe change curve of value;
Fig. 5 is the near-end pressure differential resetting value DP1 that describes according to the embodiment of the invention
SetWith DP1
Set, min, DP1
Set, maxAnd C
fChange curve between three parameters.
The specific embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Fig. 2 is the logic diagram of describing according to the water flow control system of the embodiment of the invention, referring to Fig. 2, this water flow control system 200 comprises flux and flow direction detector 210, flow restriction controller 220, pressure differential resetting value controller 230, secondary pump controller 240, far-end differential manometer 250 and near-end differential manometer 260.Wherein, flux and flow direction detector 210 is arranged on the bypass pipe 150, be used for to measure the flow direction and the flow of the current that bypass pipe 150 flows through, in the present invention, the current of definition in the bypass pipe 150 are forward (water the bypass pipe 150 by " S " flows direction " R " Shi Weizheng among Fig. 2, otherwise for bearing) when host computer side feed pipe 130 flows to user's side return pipe 140.Flux and flow direction detector 210 is electrically connected with flow restriction controller 220, thereby the flow direction and the flow information of the current in the bypass pipe 150 that detects is sent to flow restriction controller 220.Far-end differential manometer 250 be arranged on the waterpower index circuit of user's side in the central air-conditioning secondary pump chilled water system end-equipment between the water return pipeline, and near-end differential manometer 260 is arranged on supplying between water end (W.E.) vibration means for main pipe for supplying water and the backwater supervisor of user's side, in order to far-end pressure reduction and the near-end pressure reduction of measuring respectively user's side 120 grey water systems.Far-end differential manometer 250 is electrically connected with pressure differential resetting value controller 230, thereby the far-end pressure difference signal of measuring is sent to pressure differential resetting value controller 230.Near-end differential manometer 260 is electrically connected with secondary pump controller 240, thereby the near-end pressure difference signal of measuring is sent to secondary pump controller 240.In addition, pressure differential resetting value controller 230 is electrically connected with flow restriction controller 220 and secondary pump controller 240 respectively.Secondary pump controller 240 is electrically connected with secondary pump 160, thereby can control the operation of secondary pump 160, such as the operating frequency of controlling secondary pump 160 and rotating speed etc.
Fig. 3 describes to adopt the water flow control system shown in Fig. 2 the secondary chilled water user side discharge of central air conditioner system to be limited the flow chart of the method for control.In the step of execution according to the discharge control method of the embodiment of the invention, from step S101.Among the step S101, in the operation of central air-conditioning secondary chilled water system, the open water flow control system.
Among the step S102, flux and flow direction detector 210 detects flow and the flow direction of current in the bypass pipe 150 in the water flow control system, and with flow value M
BpFeed back to flow restriction controller 220.Determine M according to flowing to
BpThe sign of value, as shown in Figure 2, when current during from " S " flow direction " R " of bypass pipe 150, M
BpValue is for just; When current during from " R " flow direction " S " of bypass pipe 150, M
BpValue is for negative, and reverse backflow occurs.
In addition, far-end differential manometer 250 and near-end differential manometer 260 are measured respectively far-end pressure reduction DP2 and the near-end pressure reduction DP1 of user's side 120 in the freezing water system of central air conditioner, and, far-end differential manometer 250 feeds back to pressure differential resetting value controller 230 with the far-end pressure difference DP2 that gathers, and near-end differential manometer 260 feeds back to secondary pump controller 240 with the near-end pressure difference DP1 that gathers.
Among the step S103, flow restriction controller 220 comprises suitable logic, interface and/or circuit, at first, based on the flow threshold μ in the bypass pipe 150 of user preset, be the bypass pipe 150 interior minimum forward flows of allowing set of user (when water in bypass pipe 150 by " S " flow direction " R " Shi Weizheng, otherwise for negative), the M of 220 pairs of receptions of flow restriction controller
BpValue is processed.When being zero, flow threshold μ represents that maximum transportation flux in user's side return pipe 140 equals the flow in the host computer side feed pipe 130; When flow threshold μ represents that maximum transportation flux is less than the flow in the host computer side feed pipe 130 in user's side return pipe 140 greater than zero the time; When flow threshold μ represents that maximum transportation flux is greater than the flow in the host computer side feed pipe 130 in user's side return pipe 140 less than zero the time, reverse backflow occurs.Therefore, in actual moving process, flow threshold μ should be slightly larger than zero or equal zero.
In addition, flow restriction controller 220 is in order to calculate the maximum near-end pressure differential resetting value DP1 of user's side 120 according to formula 1
Set, max:
DP1
set，max＝DP1
LL+(DP1
UL-DP1
LL)X，X∈[0，1] (1)
Wherein, DP1
LLAnd DP1
ULBe respectively DP1
Set, maxDefault lower limit and higher limit, these two parameters are set according to real system by the user; X is default coefficient, and it is worth more than or equal to 0 less than or equal to 1.X is a variable, Fig. 4 shows the rate of change to the time (dX/dt) according to embodiment of the invention X with the changing value curve of flow in the bypass pipe 150, by can obtain the value of X to the integration of time, slope of a curve will be determined according to real system among Fig. 4.As shown in Figure 4, the discharge M in bypass pipe 150
BpBetween 0 and μ between the time, dX/dt is zero (being that X is constant); Discharge M in bypass pipe 150
BpLess than zero the time, dX/dt is negative value (X reduces), and and M
BpLinear, work as M
BpWhen negative sense increased, dX/dt is correspondingly negative sense increase also, and namely the absolute value of dX/dt is with M
BpAbsolute value increase and increase.Discharge M in bypass pipe 150
BpDuring greater than μ, dX/dt be on the occasion of, the value of dX/dt is with M
BpValue increases and linear the increase.Can find out the discharge M in bypass pipe 150 in conjunction with formula 1 with Fig. 4
BpDuring greater than predefined flow threshold μ, DP1
Set, maxCan constantly increase, the maximum limit that can reach is DP1
ULDischarge M in bypass pipe
BpMore than or equal to 0 during less than or equal to μ, DP1
Set, maxRemain unchanged; Discharge M in bypass pipe
BpLess than 0 o'clock, DP1
Set, maxCan constantly reduce, until the discharge M in the bypass pipe
BpBe zero, its minimum limit value that can reach is DP1
LL
At last, flow restriction controller 220 is with the maximum near-end pressure differential resetting value DP1 in the bypass pipe 150 that obtains
Set, maxFeed back to pressure differential resetting value controller 230.
Among the step S104, pressure differential resetting value controller 230 is used for resetting the near-end pressure differential resetting value DP1 for control secondary pump 160 operational factors
SetIn the foundation embodiments of the invention, DP1
SetBy DP1
Set, min, DP1
Set, maxAnd C
fThree parameters determine that jointly Fig. 5 shows the near-end pressure differential resetting value DP1 according to the embodiment of the invention
SetWith DP1
Set, min, DP1
Set, maxAnd C
fChange curve between three parameters.Wherein, DP1
Set, minBe DP1
SetMinimum of a value, DP1 in this embodiment
Set, minBe constant, set according to real system by the user; DP1
Set, maxBe DP1
SetMaximum, be a variable, receive from flow restriction controller 220; C
fBe terminal traffic demand coefficient, be one more than or equal to 0 less than or equal to 1 variable, reflected that end-equipment is the supply that the realizes refrigeration duty demand to cold water flow, near-end pressure differential resetting value DP1 among Fig. 5
SetWith C
fIncrease and linear the increase.In foundation one embodiment of the present of invention, pressure differential resetting value controller 230 passes through relatively from the far-end pressure reduction DP2 of far-end differential manometer 260 collections and the setting value DP2 of far-end pressure reduction DP2
SetBetween difference, and adopt FEEDBACK CONTROL to determine C
f, described FEEDBACK CONTROL is for example by continuous setup C
fValue regulate DP2 and DP2
SetBetween difference, as DP2 and DP2
SetBetween difference determine C when eliminating
fDP2 wherein
SetCan be predefined constant, also can be a real-time optimization variable, and this variable can provide under the prerequisite of enough cold water flows to user's side end-equipment guaranteeing, reduces as far as possible the drag overall of end-equipment.In another embodiment of the present invention, pressure differential resetting value controller 230 detects the unlatching situation of each end-equipment water system valve of user's side, by continuing to adjust C
fValue, make the situation of valve opening reach its setting value in advance, this valve opening situation setting value is determined according to real system voluntarily by the user.
At last, pressure differential resetting value controller 230 is with the near-end pressure differential resetting value DP1 that obtains
SetFeed back to secondary pump controller 240.
Among the step S105, secondary pump controller 240 comprises suitable logic, interface and/or circuit, in order to the near-end pressure differential resetting value DP1 that will receive from pressure differential resetting value controller 230
SetCompare with the near-end pressure difference DP1 that gathers from near-end differential manometer 260, and the result constantly adjusts the operational factor (comprising the rotating speed of secondary pump 160 or operating frequency etc.) of secondary pump 160 based on the comparison, thereby eliminate near-end pressure difference DP1 and the near-end pressure differential resetting value DP1 that measures
SetBetween difference.
Among the step S106, the secondary pump adjustment process finishes, and returns step S102, to begin next time secondary pump adjustment process.
As can be seen from the above, in traditional central air-conditioning secondary pump chilled water system, be combined with the water flow control system according to the embodiment of the invention, can based on the actual discharge and the flow direction that record from bypass pipe, obtain maximum near-end pressure differential resetting value DP1
Set, maxIn conjunction with maximum near-end pressure differential resetting value DP1
Set, max, default DP1
Set, minAnd user's side end-equipment is the supply that the realizes refrigeration duty service demand factor C to cold water flow
f, can determine near-end pressure differential resetting value DP1
SetAt last based on determined near-end pressure differential resetting value DP1
SetAdjust the operation of the secondary pump in the central air-conditioning secondary pump chilled water system, such as the rotating speed of secondary pump or operating frequency etc., thereby adjust the discharge in user's side feed pipe, guarantee that discharge in user's side return pipe is not more than the discharge in the host computer side feed pipe.Thus, can control the discharge in the bypass pipe, effectively eliminated the reverse backflow phenomenon in the bypass pipe, prevent from directly sneaking in the feed pipe so that user's side is supplied water from the backwater of user's side, finally can keep the supply water temperature of user's side to equal the leaving water temperature of handpiece Water Chilling Units, realize the energy-saving run of air-conditioning system.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (2)
1. water flow control system, be used for the discharge in the control central air-conditioning secondary pump chilled water system bypass pipe, it is characterized in that described water flow control system comprises flux and flow direction detector, flow restriction controller, pressure differential resetting value controller, secondary pump controller, far-end differential manometer and near-end differential manometer; Wherein,
Described flux and flow direction detector is arranged on the bypass pipe in the described central air-conditioning secondary pump chilled water system, sends to described flow restriction controller in order to the flow of measuring current in the described bypass pipe and the flow direction and with the information of described flow and the flow direction;
Described far-end differential manometer sends to described pressure differential resetting value controller with the far-end pressure difference signal of measuring, and described near-end differential manometer sends to described secondary pump controller with the near-end pressure difference signal of measuring;
Described pressure differential resetting value controller receives the maximum near-end pressure differential resetting value of described user's side of setting from described flow restriction controller, and the pressure differential resetting value of setting is sent to described secondary pump controller;
Described secondary pump controller is controlled the work of the secondary pump in the described central air-conditioning secondary pump chilled water system.
2. a discharge control method is used for the discharge in the control central air-conditioning secondary pump chilled water system bypass pipe, it is characterized in that, adopts water flow control system claimed in claim 1, carries out following steps:
S101, start described water flow control system;
Near-end pressure difference and the far-end pressure difference of user's side in current value in S102, the described freezing water system of central air conditioner of measurement in the bypass pipe and the described central air-conditioning secondary pump chilled water system;
The maximum near-end pressure differential resetting value of S103, the described user's side of setting;
The near-end pressure differential resetting value of S104, the described user's side of setting;
S105, the described near-end pressure difference that compares and measures and the described near-end pressure differential resetting value of determining, and the result adjusts the operational factor of secondary pump based on the comparison;
The adjustment process of S106, secondary pump finishes, and returns described step S102.
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| CN201110202193.5A CN102889664B (en) | 2011-07-19 | 2011-07-19 | System and method for controlling water discharge |
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|---|---|---|---|
| CN201110202193.5A CN102889664B (en) | 2011-07-19 | 2011-07-19 | System and method for controlling water discharge |
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| CN103290884A (en) * | 2013-06-27 | 2013-09-11 | 长沙山水节能研究院有限公司 | Method for synchronously adjusting flow of multiple tail end branch pipes of water supplying system |
| CN104566804A (en) * | 2014-12-24 | 2015-04-29 | 青岛海尔空调电子有限公司 | Control device and method of air conditioner circulation water flow rate |
| CN104990606A (en) * | 2015-07-13 | 2015-10-21 | 成都国光电子仪表有限责任公司 | Flow metering apparatus |
| CN106016623A (en) * | 2016-06-18 | 2016-10-12 | 杭州滨创能源科技有限公司 | Building air conditioner water wireless network distribution self-discipline intelligent energy-saving controller and control method |
| CN106225152A (en) * | 2016-07-26 | 2016-12-14 | 新奥泛能网络科技股份有限公司 | The control method of a kind of air-conditioner water system and control device |
| CN108981071A (en) * | 2018-07-17 | 2018-12-11 | 珠海格力电器股份有限公司 | A kind of frequency adjusting method of refrigerating water pump, device and air-conditioning equipment |
| CN109654680A (en) * | 2018-11-16 | 2019-04-19 | 中山大学 | A kind of air conditioning water heat exchanger primary side water pump control method of robustness enhancing |
| CN106225152B (en) * | 2016-07-26 | 2019-07-16 | 新奥泛能网络科技股份有限公司 | A kind of control method and control device of air-conditioner water system |
| CN114440419A (en) * | 2021-12-31 | 2022-05-06 | 博锐尚格科技股份有限公司 | Control method, device and equipment for secondary pump system of cold station and storage medium |
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| CN103290884B (en) * | 2013-06-27 | 2014-11-05 | 长沙山水节能研究院有限公司 | Method for synchronously adjusting flow of multiple tail end branch pipes of water supplying system |
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| CN104566804B (en) * | 2014-12-24 | 2019-05-24 | 青岛海尔空调电子有限公司 | The control device and method of Air-conditioning Cycle water flow |
| CN104566804A (en) * | 2014-12-24 | 2015-04-29 | 青岛海尔空调电子有限公司 | Control device and method of air conditioner circulation water flow rate |
| CN104990606A (en) * | 2015-07-13 | 2015-10-21 | 成都国光电子仪表有限责任公司 | Flow metering apparatus |
| CN106016623A (en) * | 2016-06-18 | 2016-10-12 | 杭州滨创能源科技有限公司 | Building air conditioner water wireless network distribution self-discipline intelligent energy-saving controller and control method |
| CN106225152B (en) * | 2016-07-26 | 2019-07-16 | 新奥泛能网络科技股份有限公司 | A kind of control method and control device of air-conditioner water system |
| CN106225152A (en) * | 2016-07-26 | 2016-12-14 | 新奥泛能网络科技股份有限公司 | The control method of a kind of air-conditioner water system and control device |
| CN108981071A (en) * | 2018-07-17 | 2018-12-11 | 珠海格力电器股份有限公司 | A kind of frequency adjusting method of refrigerating water pump, device and air-conditioning equipment |
| CN109654680A (en) * | 2018-11-16 | 2019-04-19 | 中山大学 | A kind of air conditioning water heat exchanger primary side water pump control method of robustness enhancing |
| CN109654680B (en) * | 2018-11-16 | 2020-02-21 | 中山大学 | Robustness-enhanced air conditioner chilled water heat exchanger primary side water pump control method |
| CN114440419A (en) * | 2021-12-31 | 2022-05-06 | 博锐尚格科技股份有限公司 | Control method, device and equipment for secondary pump system of cold station and storage medium |
| CN114440419B (en) * | 2021-12-31 | 2023-10-27 | 博锐尚格科技股份有限公司 | Control method, device, equipment and storage medium of cold station secondary pump system |
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