CN202598765U - Optimized control device of variable primary flow system - Google Patents
Optimized control device of variable primary flow system Download PDFInfo
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- CN202598765U CN202598765U CN 201220255576 CN201220255576U CN202598765U CN 202598765 U CN202598765 U CN 202598765U CN 201220255576 CN201220255576 CN 201220255576 CN 201220255576 U CN201220255576 U CN 201220255576U CN 202598765 U CN202598765 U CN 202598765U
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Abstract
The utility model discloses an optimized control device of a variable primary flow system. The optimized control device comprises a refrigerator, a water pump, air-conditioning cabinets, a water pump controller and a differential-pressure optimization setting device, wherein the refrigerator, the water pump and the air-conditioning cabinet are arranged on a water supply/return pipe; the differential-pressure optimization setting device is electrically connected with the water pump controller, a control regulating valve and a differential-pressure sensor respectively; and the water pump controller is electrically connected with a frequency converter, a flow sensor, a bypass and the control regulating valve respectively. The optimized control device disclosed by the utility model has the effects of guaranteeing the safety operation of a water system and meeting water flow requirements of the air-conditioning cabinets at all tail ends, and can be widely applied to building energy-saving and air-conditioning control field of airports, stations, wharfs and the like.
Description
Technical field
The utility model relates to a kind of system control device, particularly relates to a kind of optimal control device of primary pump variable flow system.
Background technology
The general present water system of present water system generally adopts constant flow water system and variable flow system.The power that transports out in the constant flow water system is provided by constant speed pump.The constant flow water system can not change the flow of regulating water pump according to the air conditioner load of building, and energy consumption is big.The power that transports in the flow-changing water system is generally provided by the water pump that is provided with frequency converter.Water pump is constantly adjusted rotating speed to satisfy the demand of system's end to the water yield according to water system to the demand of the water yield.Water system can be divided into pumping system and secondary pump system again, and the secondary pump system configuration is complicated, and control is also complicated.Thereby primary pump variable flow system has very big application space in actual engineering.
The control of primary pump variable flow system is normally kept the pressure reduction between water collector and the water knockout drum through the rotating speed of adjustment water pump or is kept the terminal pressure reduction of index circuit and realize.When keeping pressure reduction between water collector and the water knockout drum and control the rotating speed of water pump; The energy-saving effect of realizing is very limited; The power consumption of water pump basically with the proportional relation of flow, can not make full use of the power consumption of water pump and the cubic relationship of flow and realize farthest energy-conservation.When controlling pump rotary speed, can realize the energy-conservation of water pump to a great extent through the pressure reduction of keeping the index circuit end.But there is very big influence the installation site of the differential pressure pickup that index circuit is terminal with the control of measuring system.In the practical project system, index circuit is difficult to confirm.On the other hand, the control setting value of differential pressure controller is generally a steady state value.This control mode has certain defective.Because this pressure differential resetting value is constant, even the load of this index circuit is very little, the constant valve opening that causes of pressure reduction controlling value is very little, and the energy consumption consumption that makes water pump is on valve throttle.Because this pressure differential resetting value is constant, if the load of other loop (end) is very big, the constant valve wide open that causes of pressure reduction controlling value also can't obtain enough discharge and influences the thermal comfort of this stub area.
The utility model proposes under this background; In primary pump variable flow system, make full use of the valve position feedback signal of each terminal control water valve; Set the optimal pressure difference setting value with the adjustment pump rotary speed, guaranteeing provides enough discharge with less pump energy consumption for each end.
The utility model content
The purpose of the utility model is in order to overcome the deficiency of above-mentioned background technology, a kind of optimal control device of primary pump variable flow system to be provided, thereby primary pump variable flow system is optimized the safe operation of the control and the system of assurance.
The optimal control device of a kind of primary pump variable flow system that the utility model provides; Comprise refrigeration machine, water pump, air-conditioning cabinet, sensor and control valve, described control device also comprises pressure reduction optimization setting device, water pump controller, water main, backwater main and frequency converter; Described sensor comprises wind pushing temperature sensor, flow sensor and differential pressure pickup; Described control valve comprises control and regulation valve and bypass regulator valve; The input of described pressure reduction optimization setting device is electrically connected through lead with control and regulation valve and differential pressure pickup respectively, and the output of pressure reduction optimization setting device is electrically connected through lead with the water pump controller input; Described water pump controller also is electrically connected through lead with frequency converter, flow sensor, bypass regulator valve and differential pressure pickup respectively, on the water pipe between described water main and the backwater main, is respectively arranged with air-conditioning cabinet, control and regulation valve, bypass regulator valve and refrigeration machine.
In technique scheme, described water pump is arranged on the water main, and water pump is electrically connected with frequency converter, and water pump is connected through water pipe with flow sensor.
In technique scheme, described air-conditioning cabinet also is equiped with temperature controller and wind pushing temperature sensor; The air-conditioning cabinet is connected with described control and regulation valve water pipe respectively with temperature controller and is electrically connected.
In technique scheme, the quantity of described air-conditioning cabinet is one or more, is all one or more with the temperature controller of air-conditioning cabinet coupling and the quantity of supply air sensor.
Described refrigeration machine comprises evaporimeter and condenser.
The optimal control device and method of described primary pump variable flow system; Has following beneficial effect: supply the pressure reduction of backwater main just can be controlled at the floor level that satisfies each terminal air-conditioning cabinet discharge demand; The energy consumption of water pump also is controlled at the floor level that system needs, and reduces the energy consumption of water pump greatly.Even each terminal air-conditioning cabinet is load unbalanced, this control method can guarantee that also the water yield demand and the pump energy consumption of each air-conditioning cabinet is minimum.
The technical characterstic of the optimal control device of the described primary pump variable flow system of the utility model: 1, pressure reduction optimal control techniques make use the valve position feedback signal of each air-conditioning cabinet control and regulation valves; 2, change the pressure differential resetting value that supplies the backwater main at any time according to the load variations of each air-conditioning cabinet (being reflected in the variation of control and regulation valve valve position), this pressure differential resetting value constantly changes according to the variation of system loading.Through changing setting value, the control and regulation valve of the air-conditioning cabinet of maximal valve position feedback signal is reached or near maximum opening; 3, because the pressure differential resetting value is to need and changing according to system, the rotating speed of water pump is controlled at the minimum speed that system needs all the time; 4, through the control of monitoring discharge and bypass regulator valve, the discharge of the evaporator of refrigerator of flowing through is not less than the minimum discharge that evaporator of refrigerator allows, and guarantees the safe operation of system; 5, said control technology can satisfy the demand of each terminal air-conditioning cabinet to discharge, can reduce the energy consumption of water pump again to greatest extent and guarantee system safety operation.
In sum; The described optimal control device of the utility model both can have been loaded endways and guaranteed the enough discharge of each terminal air-conditioning cabinet when very big; Also can when each terminal air-conditioning cabinet is load unbalanced, guarantee the enough discharge of each terminal air-conditioning cabinet; The less time province's water pump energy consumption of can also loading endways guarantees the enough discharge of each terminal air-conditioning cabinet, guarantees system safety operation under low discharge simultaneously.If should technology can obtain extensive popularization and application; Can keep the safe operation of water system well; When satisfying each terminal air-conditioning cabinet discharge demand of primary pump variable flow system, can realize the energy-conservation of air-conditioning system widely, reduce carbon emission, the protection environment.The utility model can be widely used in building energy conservation and air-conditioning control fields such as airport, station, harbour, hotel, universities and colleges, office block.
Description of drawings
Fig. 1 is the structural representation of optimal control device of the primary pump variable flow system of the utility model.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is done further to describe in detail, but this embodiment should not be construed as the restriction to the utility model.
The optimal control device of the described primary pump variable flow system of the utility model comprises refrigeration machine 1, water pump 2, air-conditioning cabinet 3-n, control valve, frequency converter 7, sensor, pressure reduction optimization setting device 13 and water pump controller 14.The input of described pressure reduction optimization setting device 13 control and regulation valve 4-n and differential pressure pickup 9 corresponding with air-conditioning cabinet 3-n respectively or coupling are electrically connected through lead; Differential pressure pickup 9 is electrically connected through lead with water pump controller 14 simultaneously; The output of pressure reduction optimization setting device 13 is electrically connected through lead with the input of water pump controller 14; The input of water pump controller 14 is electrically connected through lead with differential pressure pickup 9 and flow sensor 8 respectively, and the output of water pump controller 14 is electrically connected through lead with the input of frequency converter 7 and bypass regulator valve 10 respectively; The other end of frequency converter 7 is electrically connected with water pump 2; Between water main 11 and backwater main 12, be provided with refrigeration machine 1, bypass regulator valve 10, air-conditioning cabinet 3-n and control and regulation valve 4-n; Flow sensor 8 all is arranged on the water main 11 with water pump 2.
Several terminal air-conditioning cabinet 3-n are arranged in the optimal control device of primary pump variable flow system usually; Present embodiment is provided with the first air-conditioning cabinet 3-1, the second air-conditioning cabinet 3-2 and the 3rd air-conditioning cabinet 3-3; What match is provided with the first temperature controller 6-1, the second temperature controller 6-2 and the 3rd temperature controller 6-3; The first wind pushing temperature sensor 5-1, the second wind pushing temperature sensor 5-2 and the 3rd wind pushing temperature sensor 5-3; Certainly, the first wind pushing temperature sensor 5-1, the second wind pushing temperature sensor 5-2 and the 3rd wind pushing temperature sensor 5-3 also can be used as return air temperature sensor; Be equiped with corresponding temperature controller 6-n and wind pushing temperature sensor or return air temperature sensor 5-n in each air-conditioning cabinet 3-n, the end of each air-conditioning cabinet 3-n connects through water pipe with the corresponding control and regulation valve 4-n that controller is housed; Each temperature controller 6-n is electrically connected with corresponding control and regulation valve 4-n and wind pushing temperature sensor or return air temperature sensor 5-n respectively; The other end of each air-conditioning cabinet 3-n is connected with the water pipe of backwater main 12.
The optimal control method of described primary pump variable flow system, its control program is following: the aperture that wind pushing temperature that temperature controller 6-n measures according to the temperature sensor 5-n of correspondence or return air temperature are regulated control and regulation valve 4-n with holding temperature in setting value; Pressure reduction optimization setting device 13 detects the valve position feedback signal with the control and regulation valve 4-n of corresponding air-conditioning cabinet 3-n; From the valve feedback signal of all control and regulation valve 4-n, pick out the maximum terminal air-conditioning cabinet 3-n of feedback signal, pressure reduction optimization setting device 13 changes pressure differential resetting value P
SetThis control and regulation valve 4-n is reached or near maximum opening; The pressure reduction P that water pump controller 14 is set according to pressure reduction optimization setting device 13
SetAnd the difference of the pressure reduction that records of differential pressure pickup 9 is controlled the pressure differential maintain that makes between water main 11 and the backwater main 12 at setting value P through the rotating speed of 7 pairs of water pumps 2 of frequency converter
SetThe discharge that water pump controller 14 is measured through flow sensor 8 compares with the permission minimum discharge of the evaporimeter of refrigeration machine 1 and determines whether to regulate bypass regulator valve 10, with the minimum discharge of the evaporimeter permission that guarantees refrigeration machine 1.
Valve position feedback signal V1～Vn that pressure reduction optimization setting device 13 obtains the control and regulation valve 4-n of each air-conditioning cabinet 3-n (is generally 0～10V; 0 expression complete shut-down position; 10 expression fully open positions), optimize the pressure differential resetting value P of water main 11 and backwater main 12 according to the valve position feedback signal of all control and regulation valve 4-n
SetPressure reduction optimization setting device 13 changes pressure differential resetting value P
SetMethod be: when the maximum corresponding control and regulation valve 4-n of air-conditioning cabinet 3-n of valve position feedback signal did not reach maximum opening, pressure reduction optimization setting device 13 progressively reduced pressure differential resetting value P
Set, reduce water main 11 and backwater main 12 pressure differential resetting value P
SetAfter, water pump controller 14 reduces pressure reduction through the rotating speed of frequency converter 7 control water pumps 2, and the control and regulation valve 4-n valve position that air-conditioning cabinet 3-n is corresponding increases gradually, to reach the discharge that needs; When the maximum corresponding control and regulation valve 4-n of air-conditioning cabinet 3-n of feedback signal reaches maximum opening, the pressure reduction optimization setting device 13 pressure differential resetting value P that progressively raises
Set, increase water main 11 and backwater main 12 pressure differential resetting value P
SetAfter, water pump controller 14 raises pressure reduction through the rotating speed of frequency converter 7 control water pumps 2, and the control and regulation valve 4-n valve position of air-conditioning cabinet 3-n reduces gradually, to reach the discharge that needs; When pressure reduction optimization setting device 13 detects control and regulation valve 4-n maximum feedback signal near maximum opening (representing 95% valve seat opening such as 9.5V); Pressure reduction optimization setting device 13 keeps this pressure differential resetting value, constantly detects simultaneously and respectively controls to adjust valve 4-n valve position feedback signal.
Like this, the pressure differential resetting value of primary pump variable flow system just is controlled at the floor level that system needs, and pump rotary speed is controlled at the floor level that system needs, and pump energy consumption is controlled at the floor level that needs, and guarantees the normal operation of system simultaneously.
Obviously, those skilled in the art can carry out various changes and modification to the utility model and not break away from the spirit and the scope of the utility model.Like this, belong within the scope of the utility model claim and equivalent technologies thereof if these of the utility model are revised with modification, then the utility model also is intended to comprise these changes and modification interior.
The content of not doing in this specification to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (4)
1. the optimal control device of a primary pump variable flow system; Comprise refrigeration machine (1), water pump (2), air-conditioning cabinet (3-n), sensor and control valve, it is characterized in that: described control device also comprises pressure reduction optimization setting device (13), water pump controller (14), water main (11), backwater main (12) and frequency converter (7); Described sensor comprises wind pushing temperature sensor (5), flow sensor (8) and differential pressure pickup (9); Described control valve comprises control and regulation valve (4-n) and bypass regulator valve (10); The input of described pressure reduction optimization setting device (13) is electrically connected through lead with control and regulation valve (4-n) and differential pressure pickup (9) respectively, and the output of pressure reduction optimization setting device (13) is electrically connected through lead with water pump controller (14) input; Described water pump controller (14) also is electrically connected through lead with frequency converter (7), flow sensor (8), bypass regulator valve (10) and differential pressure pickup (9) respectively, on the water pipe between described water main (11) and the backwater main (12), is respectively arranged with air-conditioning cabinet (3-n), control and regulation valve (4-n), bypass regulator valve (10) and refrigeration machine (1).
2. the optimal control device of primary pump variable flow system according to claim 1; It is characterized in that: described water pump (2) is arranged on the water main (11); Water pump (2) is electrically connected with frequency converter (7), and water pump (2) is connected through water pipe with flow sensor (18).
3. the optimal control device of primary pump variable flow system according to claim 1 and 2, it is characterized in that: described air-conditioning cabinet (3-n) also is equiped with temperature controller (6-n) and wind pushing temperature sensor (5-n); Air-conditioning cabinet (3-n) is connected with described control and regulation valve (4-n) water pipe respectively with temperature controller (6-n) and is electrically connected.
4. the optimal control device of primary pump variable flow system according to claim 3; It is characterized in that: the quantity of described air-conditioning cabinet (3-n) is one or more, is all one or more with the temperature controller (6-n) of air-conditioning cabinet (3-n) coupling and the quantity of supply air sensor (5-n).
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| CN 201220255576 CN202598765U (en) | 2012-06-01 | 2012-06-01 | Optimized control device of variable primary flow system |
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| CN 201220255576 CN202598765U (en) | 2012-06-01 | 2012-06-01 | Optimized control device of variable primary flow system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705956A (en) * | 2012-06-01 | 2012-10-03 | 武汉裕生智能节能设备有限公司 | Optimal control device and method for primary pump variable flow system |
| CN104676837A (en) * | 2015-02-11 | 2015-06-03 | 广州市科维机电设备安装有限公司 | Variable-frequency energy-saving method applied to whole-process temperature difference control of central air conditioner freeze water system |
| CN105240958A (en) * | 2015-11-04 | 2016-01-13 | 杭州绿程节能科技有限公司 | Dual-cold-source three-pipe-system air conditioner system |
| CN106369784A (en) * | 2016-10-19 | 2017-02-01 | 中铁第四勘察设计院集团有限公司 | Integrated air conditioning terminal device and control method thereof |
| CN113623783A (en) * | 2020-05-06 | 2021-11-09 | 江苏远视环境科技有限公司 | Primary pump bidirectional variable flow machine room |
| CN113983675A (en) * | 2021-11-10 | 2022-01-28 | 上海观燃智能科技有限公司 | Bypass differential pressure variable frequency regulation air conditioner chilled water system and hydraulic balance method thereof |
-
2012
- 2012-06-01 CN CN 201220255576 patent/CN202598765U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705956A (en) * | 2012-06-01 | 2012-10-03 | 武汉裕生智能节能设备有限公司 | Optimal control device and method for primary pump variable flow system |
| CN102705956B (en) * | 2012-06-01 | 2014-07-30 | 武汉裕生智能节能设备有限公司 | Optimal control device and method for primary pump variable flow system |
| CN104676837A (en) * | 2015-02-11 | 2015-06-03 | 广州市科维机电设备安装有限公司 | Variable-frequency energy-saving method applied to whole-process temperature difference control of central air conditioner freeze water system |
| CN104676837B (en) * | 2015-02-11 | 2017-08-25 | 广州市科维机电设备安装有限公司 | Energy-saving and frequency-variable method applied to the whole temperature difference control of freezing water system of central air conditioner |
| CN105240958A (en) * | 2015-11-04 | 2016-01-13 | 杭州绿程节能科技有限公司 | Dual-cold-source three-pipe-system air conditioner system |
| CN105240958B (en) * | 2015-11-04 | 2017-10-17 | 杭州绿程节能科技有限公司 | Double control air-conditioning systems of low-temperature receiver three |
| CN106369784A (en) * | 2016-10-19 | 2017-02-01 | 中铁第四勘察设计院集团有限公司 | Integrated air conditioning terminal device and control method thereof |
| CN113623783A (en) * | 2020-05-06 | 2021-11-09 | 江苏远视环境科技有限公司 | Primary pump bidirectional variable flow machine room |
| CN113983675A (en) * | 2021-11-10 | 2022-01-28 | 上海观燃智能科技有限公司 | Bypass differential pressure variable frequency regulation air conditioner chilled water system and hydraulic balance method thereof |
| CN113983675B (en) * | 2021-11-10 | 2023-10-10 | 上海观燃智能科技有限公司 | Bypass differential pressure variable frequency air conditioner chilled water adjusting system and hydraulic balance method thereof |
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