CN204943785U - Be applicable to the vari-able flow control system of air-conditioning Variable flow system - Google Patents
Be applicable to the vari-able flow control system of air-conditioning Variable flow system Download PDFInfo
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- CN204943785U CN204943785U CN201520570434.5U CN201520570434U CN204943785U CN 204943785 U CN204943785 U CN 204943785U CN 201520570434 U CN201520570434 U CN 201520570434U CN 204943785 U CN204943785 U CN 204943785U
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Abstract
The utility model provides the vari-able flow control system being applicable to air-conditioning Variable flow system, relates to refrigeration control field, for accuracy when improving cold power and cold water conveying adjustment, reduces energy consumption and safe and stable operation and invents.This vari-able flow control system comprises cold output control device, primary pump frequency-converting control device and cold water Minimum Flow Control device, and cold output control device, according to cold water, return water temperature and cold water flow, carries out power control to cold device; Primary pump frequency-converting control device, for the cold water flow of the cold water temperature according to supply channel, cold device and the confession backwater differential pressure of air-conditioning system, VFC is carried out to primary pump, cold water Minimum Flow Control device, control balance pipe return valve according to cold water flow, the cold power that the utility model can be used in air-conditioning Variable flow system controls and frequency conversion control technique.
Description
Technical field
The utility model relates to handpiece Water Chilling Units control field, particularly relates to a kind of vari-able flow control system being applicable to air-conditioning Variable flow system.
Background technology
At present, what a part of handpiece Water Chilling Units, particularly Large Central Air Conditioning System system adopted is one-level variable frequency pump.
This be due to, as shown in Figure 1, traditional Variable flow system is as follows: comprise water chilling unit system (i.e. cold device), primary pump group, supply channel and water return pipeline, wherein, supply channel comprises water main 5 and the multiple water supply be arranged in parallel on water main 5 are in charge of 2, water return pipeline comprises return main 6 and the multiple backwater be arranged in parallel on return main 6 are in charge of 3, water chilling unit system comprises the multiple handpiece Water Chilling Units 1 be arranged in parallel, water main 5 comprises multiple water supply and is in charge of 2, return main 6 comprises multiple backwater and is in charge of 3, primary pump group comprises the multiple pumps 4 be arranged in parallel, the outlet pipe of water chilling unit system is connected with the water inlet pipe of primary pump group, the outlet pipe of primary pump group is aggregated into water main 5 and is in charge of 2 with water supply and is connected, and by utilizing backwater to be in charge of 3 and be in charge of 3 return mains gathered 6 by backwater and be back to water chilling unit system and recycle after user.
Different from general pump, the one-level variable frequency pump adopted within air-conditioning systems can regulate water flow, realizes the adjustment to air conditioner load.
At present, for being applicable in the vari-able flow control system of air-conditioning Variable flow system, in order to really overcome energy consumption waste, at least need to carry two aspects to start with from the adjustment of cold power and cold water, realize the cold equilibrium of supply and demand and hydraulic equilibrium is the most basic requirement, have the technology of two aspects at present, one is adopt single loop feedback control technology to regulate the rotating speed of one-level variable frequency pump based on for backwater pressure reduction, implement cold water pipage control, realize cold supply and mate with the effective of air conditioner load; Two is constant water outlet temperature setting values, adopts single loop feedback control technology automatically to adjust cold power.
In existing cold power adjustment with cold water pipage control technology, cold water temperature, confession backwater differential pressure adopt single loop FEEDBACK CONTROL, often have ignored the unit when underload and there is the restriction of cold minimum discharge and protection problem, and Cold water-out temperature likely there will be to transfinite and is in runaway condition and cannot meets the requirement of air conditioning terminal to the matter of cold water when high load capacity, simultaneously, adopt single loop FEEDBACK CONTROL, only have controller after waiting until controlled Parameters variation just can intervene, there is hysteresis quality in adjustment, this control method can affect the stability of technological parameter undoubtedly, and in cold and central air conditioner system, there is various interference, as cold water flow, the change of return water temperature can have considerable influence to the change of cold leaving water temperature, the fluctuation of system pressure also can have influence on the change of cold water flow and then affect for backwater differential pressure, the simple problem that effectively cannot solve technological parameter stability by single loop FEEDBACK CONTROL, also hidden danger can be brought to the security of system cloud gray model.
In sum, in above-mentioned existing cold power adjustment with cold water pipage control technology, above-mentioned technology all there is cold power and cold water conveying adjustment accuracy is not good, the problem of security and stability difference.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of vari-able flow control system being applicable to air-conditioning Variable flow system, accuracy during for guaranteeing cold power and cold water conveying adjustment and security of operation stability, so energy-saving and cost-reducing, complicated applications occasion can be applicable to.
For achieving the above object, first aspect of the present utility model, to put forward a kind of vari-able flow control system being applicable to air-conditioning Variable flow system, comprise cold device, be connected to the supply channel of the delivery port of described cold device, the water return pipeline being connected to the water inlet of described cold device, the equalizing line that is arranged on the air-conditioning system between described supply channel and described water return pipeline and is arranged in parallel with described air-conditioning system;
Wherein, described air-conditioning system comprises the air conditioning terminal of one or more parallel connection, and air conditioning terminal is fan coil; Described water return pipeline is provided with for the primary pump to cold device backwater;
Described control system also comprises:
Cold output control device, for the return water temperature of the cold water temperature according to described supply channel, described water return pipeline and the cold water flow of described cold device, carries out power control to described cold device;
Primary pump frequency-converting control device, for the cold water flow of the cold water temperature according to described supply channel, described cold device and the confession backwater differential pressure of described air-conditioning system, carries out VFC to described primary pump;
Cold water Minimum Flow Control device, for according to cold water flow, controls the return valve on equalizing line.
In the first possible implementation of first aspect of the present utility model, described cold output control device comprises:
Cold water temperature meter, is arranged on described supply channel, measures the cold water temperature of described supply channel;
Return water temperature meter, is arranged on described water return pipeline, measures the return water temperature of described water return pipeline;
Cold water flow meter, is arranged on described cold device place, measures the cold water flow of described cold device;
Return water temperature feedforward controller, the return water temperature of the described water return pipeline measured by described return water temperature meter, calculates and exports the first power control signal;
Cold water flow feedforward controller, the cold water flow of the described cold device measured by described cold water flow meter, calculates and exports the second power control signal;
Cold water temperature controller, the cold water temperature of the described supply channel measured by described cold water temperature meter, calculates and exports the 3rd power control signal;
Adder, sues for peace to described first, second and the 3rd power control signal, the value after summation is exported as power control signal.
In conjunction with first aspect of the present utility model or first aspect of the present utility model the first may, in the implementation that the second of first aspect of the present utility model is possible, described primary pump frequency-converting control device comprises:
Cold water temperature meter, is arranged on described supply channel, measures the cold water temperature of described supply channel;
Water flow temperature transfinites controller, for the cold water temperature measured according to described cold water temperature meter, calculates and exports the first frequency change control signal;
Confession backwater differential pressure measurement unit, for measuring the confession backwater differential pressure of described air-conditioning system;
Confession backwater differential pressure controller, according to described for the confession backwater differential pressure value measured by backwater differential pressure computing unit, calculate and exports for backwater differential pressure control signal;
Cold water flow meter, is arranged on described cold device place, measures the cold water flow of described cold device;
Cold water flow controller, according to described for backwater differential pressure controller export for backwater differential pressure control signal as the cold water flow measured by cold water flow duty setting signal and described cold water flow meter, calculate and output flow control signal;
Frequency conversion Staged cotrol device, according to the flow control signal that described cold water flow controller exports, calculates output second frequency change control signal;
The low selector of signal, the low signal of signal value in select described water flow temperature to transfinite the first frequency change control signal that controller exports and the second frequency change control signal that described frequency conversion Staged cotrol device exports, exports as primary pump control signal;
Primary pump controller, according to the primary pump control signal that the low selector of described signal exports, carries out VFC to described primary pump.
The second in conjunction with first aspect of the present utility model may, in the third possible implementation of first aspect of the present utility model, cold water Minimum Flow Control device comprises, backflow Staged cotrol device, according to the flow control signal that described cold water flow controller exports, calculate the control signal exporting return valve on balance pipe.
The vari-able flow control system of what the utility model embodiment provided be applicable to air-conditioning Variable flow system, because cold water temperature is realized by adjustment cold power, only have when cold power and air conditioning terminal customer charge match, cold water temperature just can be stablized, and cold water flow, the change of return water temperature is the Direct Variable of reflection air conditioning terminal load variations, with cold water flow, return water temperature is as the feed forward variable of load adjustment, substantially increase the promptness of power adjustment, cold water temperature adopts Multivariable Feedforward feedback control strategy effectively can stablize cold water temperature, meet the requirement of air-conditioning system to the matter of cold water, compensate for the lagging influence that traditional cold water temperature single loop feedback control strategy brings.
Adopt serials control for backwater differential pressure and cold water flow, can eliminate as system pressure changes the impact of exerting oneself on water supply pump, and then reach the object improved for backwater differential pressure stability.
Control strategy is selected because cold water flow and cold water temperature adopt, when cold water temperature overtemperature, volitional check water supply pump frequency conversion rotating speed can be promoted, usually under high loads, when preventing cold water flow excessive, cold water temperature is in runaway condition, cannot meet the requirement of air conditioning terminal to the matter of cold water.；
And when underload, cool water quantity needed for air-conditioning system reduces, cold safe operation problem is caused by the flow of cold is too small under preventing extreme case, water supply pump frequency conversion and balance pipe return valve adopt Staged cotrol technology, when water supply pump minimum speed cannot ensure discharge minimum of a value, by return valve on adjustment balance pipe to ensure the minimum discharge by cold.
Thus can realize according to the utility model can rapid adjustment handpiece Water Chilling Units power according to the change of air conditioner load, meets supply and demand energy balance; Simultaneously can according to the change of air conditioner load, by adjusting cold water variable frequency pump rotating speed in time, realize cold water conveying energy consumption minimum, can ensure when high load capacity simultaneously, meet air-conditioning system to the safety assurance flowing through handpiece Water Chilling Units cold water minimum discharge when the requirement of the matter of cold water temperature and underload.
Accompanying drawing explanation
The schematic diagram of the air-conditioning Variable flow system that Fig. 1 provides for prior art;
Fig. 2 is the general frame schematic diagram being applicable to air-conditioning Variable flow system of the utility model embodiment;
Fig. 3 is the schematic diagram being applicable to the vari-able flow control system of air-conditioning Variable flow system of the utility model embodiment;
The cold output control device C10a schematic diagram in systems in which that Fig. 4 is control system shown in Fig. 3;
The primary pump frequency-converting control device C10b that Fig. 5 is control system shown in Fig. 3 and cold water Minimum Flow Control device C10c schematic diagram in systems in which;
Fig. 6 is the principle key diagram of the cold output control device C10a of the control system of the utility model embodiment;
Fig. 7 is the primary pump frequency-converting control device C10b of the control system of the utility model embodiment and the principle key diagram of cold water Minimum Flow Control device C10c.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
First, the utility model embodiment provides a kind of vari-able flow control system being applicable to air-conditioning Variable flow system.Below by way of specific embodiment, the vari-able flow control system being applicable to air-conditioning Variable flow system that the utility model embodiment provides is described in detail.
As background technology propose as in the one-level variable frequency pump of prior art, based on the cold power adjustment technology of air conditioner load, owing to adopting single loop FEEDBACK CONTROL, there is hysteresis quality in the adjustment of cold power; If therefore controlled by cold power adjustment technology in background technology, then Mass Control is difficult to ensure.And existing water supply pump frequency conversion control technique, owing to not considering that air-conditioning system may bring the problem of operation at high and low load, the requirement to cold water temperature matter cannot be met when high load capacity, and the safe operation problem that the requirement that cannot meet cold minimum discharge when underload causes.
The cardinal principle of the utility model embodiment is, in the vari-able flow control system being applicable to air-conditioning Variable flow system that the utility model embodiment provides, multivariable Control strategy is adopted to implement the timely rapid adjustment of cold power according to cold water temperature, return water temperature and cold water flow, consider that air-conditioning system adopts the Advanced Control Strategies such as selection and point journey to reach and realizes safety, stable operation and energy-conservation object under different load, enable the service requirement adapting to complicated applications occasion.
Specifically, for the problem existing for above-mentioned background technology, the utility model embodiment provides a kind of vari-able flow control system being applicable to air-conditioning Variable flow system, as shown in Figures 2 and 3, the equalizing line L4 comprising cold device 10, be connected to the supply channel L1 of the delivery port of cold device 10, be connected to the water return pipeline L2 of the water inlet of cold device 10, be arranged on the air-conditioning system 20 between supply channel L1 and water return pipeline L2 and be arranged in parallel with described air-conditioning system.
Wherein, air-conditioning system 20 can comprise the air conditioning terminal of one or more parallel connection, and air conditioning terminal is fan coil; Water return pipeline L2 is provided with for the primary pump P10 to cold device 10 backwater.
Control system also comprises:
Cold output control device C10a, for the return water temperature of the cold water temperature according to supply channel L1, water return pipeline L2 and the cold water flow of cold device 10, carries out power control to cold device 10.
Primary pump frequency-converting control device C10b, for calculating cold water temperature, the cold water flow of cold device 10 and the confession backwater differential pressure of air-conditioning system 20 according to supply channel L1, carries out P10 VFC to primary pump.
Cold water Minimum Flow Control device C10c, for according to cold water flow, controls the return valve U on equalizing line L4.
Below the course of work of the utility model above-described embodiment is briefly explained.Current, under the VFC of primary pump P10, are supplied to supply channel L1 by cold device 10, and current flow through supply channel L1 and are supplied to the branch road L3 of air-conditioning system, and finally flow back to cold device 10 via water return pipeline L2.Here, primary pump frequency-converting control device C10b can based on supply water and be respectively arranged with in water return pipeline L1, L2 water flow temperature measured by cold water temperature meter T1, cold water flow process meter F, air-conditioning system for backwater differential pressure, to for carrying out variable frequency adjustment to the primary pump of cold device 10 backwater; Cold output control device C10a then according to the cold water flow of the cold water temperature of supply channel L1, the return water temperature of water return pipeline L2 and cold device 10, carries out power control to cold device 10; Further, cold water Minimum Flow Control device C10c, then according to for cold water flow, control the return valve on equalizing line L4.
Here, it should be noted that, equalizing line L4 is mainly used in overcoming Static Water force unbalance in system, also has the safeguard protection effect ensureing cold minimum discharge simultaneously.Return valve U is arranged on equalizing line L4, by guaranteeing cold water flow minimum of a value, can run play a protective role to cold.
To this, as the example of an embody rule scene of the utility model embodiment, as shown in Fig. 4 and Fig. 6, in this embodiment, described cold output control device C10a comprises:
Cold water temperature meter T1, is arranged on supply channel L1, measures the cold water temperature T1a of supply channel L1;
Return water temperature meter T2, is arranged on L2 water return pipeline, measures the return water temperature T2a of water return pipeline L2;
Cold water flow meter F, is arranged on cold device 10 place, measures the cold water flow Fa of cold device 10;
Return water temperature feedforward controller A1, the return water temperature T2a of the water return pipeline L2 measured by return water temperature meter T2, calculate and export the first power control signal TIC2;
Cold water flow feedforward controller A2, the cold water flow Fa of the cold device measured by cold water flow meter F, calculate and export the second power control signal FIC;
Cold water temperature controller A3, the cold water temperature T1a of the supply channel L1 measured by cold water temperature meter T1, calculate and export the 3rd power control signal TIC1;
Adder, sues for peace to described first, second and the 3rd power control signal TIC2, FIC, TIC1, the value after summation is exported as power control signal.
According to this power control signal, the power of cold device 10 is controlled.
More specifically, as shown in Figure 5 and 7, described primary pump frequency-converting control device C10b comprises:
Cold water temperature meter T1, is arranged on supply channel L1, measures the cold water temperature T1a of supply channel L1;
Water flow temperature transfinites controller A4, for the cold water temperature T1a measured according to cold water temperature meter T1, calculates and exports the first frequency change control signal TIC-1;
Confession backwater differential pressure measurement unit C2, for measuring the confession backwater differential pressure Pa of air-conditioning system 20;
Confession backwater differential pressure controller A5, according to for the confession backwater differential pressure value Pa measured by backwater differential pressure computing unit C2, calculates and exports for backwater differential pressure control signal FSP;
Cold water flow meter F, is arranged on cold device 10 place, measures the cold water flow Fa of cold device 10;
Cold water flow controller A6, supplies backwater differential pressure control signal FSP as the cold water flow Fa measured by cold water flow setting value and cold water flow meter F according to what export for backwater differential pressure controller C2, calculates and export cold water flow control signal FIC-1;
Frequency conversion Staged cotrol device A7, according to the flow control signal that described cold water flow controller exports, calculates output second frequency change control signal;
The low signal of signal value in the second frequency change control signal FIC-2 that the low selector S1 of signal, the first frequency change control signal TIC-1 that controller A4 exports and frequency conversion Staged cotrol device A7 that selects water flow temperature to transfinite export, exports as primary pump control signal;
Primary pump controller B2, according to the primary pump control signal that the low selector S1 of signal exports, carries out VFC to primary pump P10;
Described cold water Minimum Flow Control device C10c comprises:
Backflow Staged cotrol device A8, according to the flow control signal that described cold water flow controller exports, calculates the control signal of the return valve exported on balance pipe.
For example, in a specific embodiment of the present utility model, as shown in FIG. 6 and 7,
T2a is return water temperature, and the input of access return water temperature feedforward controller A1, as measured value.Fa is cold water flow, and the input of access cold water flow feedforward controller A2, as measured value.T1a is cold water temperature, and the input of access cold water temperature controller A3, as measured value.The output signal TIC1 sum of the output signal TIC2 of return water temperature feedforward controller A1, the output signal FIC of cold water flow feedforward controller A2, cold water temperature controller A3 is as the input signal of cold device 10.
Here, it should be noted that, cold water temperature controller A3 adopts pid control algorithm, feedforward controller algorithm adopts lead-lag algorithm, and form is K* (1+T1S)/(1+T2S), certainly, the utility model embodiment is only example to this, is not particularly limited.
In this embodiment of the present utility model, because cold water temperature is realized by adjustment cold power, only have when cold load and air conditioning terminal customer charge match, cold water temperature just can be stablized, and the change of cold water flow, return water temperature is the Direct Variable of reflection air conditioning terminal load variations, with cold water flow, return water temperature as the feed forward variable of load adjustment, substantially increase the promptness of load adjustment, cold water temperature adopts Multivariable Feedforward feedback control strategy effectively can stablize cold water temperature.
In addition, Pa be air-conditioning 20 for backwater differential pressure value Pa, obtain by calculating for backwater differential pressure computing unit C2, and export the input for backwater differential pressure controller A5 to, as measured value.Fa is cold water flow, and the input of access cold water flow controller A6, as measured value.Supply the output signal FSP of backwater differential pressure controller A5 as the input of the setting value access cold water flow controller A6 of cold water flow controller A6, for backwater differential pressure controller A5 as master selector, cold water flow controller A6 is as secondary controller, the two forms a cascade control system, adopts pid control algorithm for backwater differential pressure controller and cold water flow controller.
Have again, frequency conversion Staged cotrol device A7 receives the output flow control signal FIC-1 of flow controller as input signal, the output signal of frequency conversion Staged cotrol device A7 calculates in the following manner, that is: when flow control signal FIC-1 is in 60% ~ 100% change, the numerical value of the output signal FIC-2 of frequency conversion Staged cotrol device A7 equals FIC-1, when FIC-1 lower than 60% time, the output signal FIC-2 of frequency conversion Staged cotrol device A7 exports 60%;
In addition, T1a is cold water temperature, and access cold water temperature transfinites the input of controller A4, as measured value.The output signal FIC-2 of frequency conversion Staged cotrol device A7 and the cold water temperature controller A4 that transfinites outputs signal TIC-1 and inputs as two of the low selector S1 of signal, signal low selector S1 selects signal that input numerical value is low as the output signal of the low selector S1 of signal, and accesses the input of water supply pump frequency converter B 2.Thus the primary pump P10 of cold device carries out VFC by water supply pump frequency converter B 2;
Separately have; backflow Staged cotrol device A8; receive the output flow control signal FIC-1 of cold water flow controller as input signal; the output signal of backflow Staged cotrol device A8 calculates in the following manner; that is: when flow F IC-1 is in 0% ~ 60% change; the numerical value of the output signal U of backflow Staged cotrol device A8 changes 100% ~ 0%, that is: U=-5/3*FIC-1+100%, thus realizes cold cold water minimum discharge safety protection control by carrying out adjustment to balance pipe return valve.
In this embodiment of the present utility model, adopt Multivariable Feedforward feedback control technology to implement cold power according to cold water temperature, return water temperature and cold water flow and control, accuracy and the promptness of cold power adjustment can be promoted; Adopt serials control for backwater differential pressure and cold water flow, can eliminate as system pressure changes the impact of exerting oneself on water supply pump, and then reach the object improved for backwater differential pressure stability.Set minimum cold water flow controls, the safe operation hidden danger that when can avoid underload, cold water flow allows lower limit to bring lower than unit, and adopt for backwater differential pressure and cold water temperature and select control strategy, when cold water temperature overtemperature, volitional check can promote water supply pump frequency conversion rotating speed, usually under high loads, when preventing cold water flow excessive, cold water temperature is in runaway condition, can guarantee the requirement of air-conditioning system to cold water temperature matter.In sum, the utility model can ensure security of system stable operation from many aspects, and can realize energy-conservation object, and enables the service requirement adapting to complicated applications occasion.
Finally, it should be noted that, although illustrate that each controller and temperature survey table are illustrated for integrated device in above-mentioned explanation, but, their accessible site are in an ICU, or respectively to should each functional module of ICU, the utility model embodiment limit this.
The above; be only detailed description of the invention of the present utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; change can be expected easily or replace, all should be encompassed within protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of described claim.
Claims (4)
1. be applicable to a vari-able flow control system for air-conditioning Variable flow system, comprise cold device, be connected to the supply channel of the delivery port of described cold device, the water return pipeline being connected to the water inlet of described cold device, the equalizing line that is arranged on the air-conditioning system between described supply channel and described water return pipeline and is arranged in parallel with described air-conditioning system;
It is characterized in that, described air-conditioning system comprises the air conditioning terminal of one or more parallel connection, and described air conditioning terminal is fan coil; Described water return pipeline is provided with for the primary pump to cold device backwater;
Described control system also comprises:
Cold output control device, for the return water temperature of the cold water temperature according to described supply channel, described water return pipeline and the cold water flow of described cold device, carries out power control to described cold device;
Primary pump frequency-converting control device, for the cold water flow of the cold water temperature according to described supply channel, described cold device and the confession backwater differential pressure of described air-conditioning system, carries out VFC to described primary pump;
Cold water Minimum Flow Control device, for according to cold water flow, controls the return valve on equalizing line.
2. control system according to claim 1, is characterized in that,
Described cold output control device comprises:
Cold water temperature meter, is arranged on described supply channel, measures the cold water temperature of described supply channel;
Return water temperature meter, is arranged on described water return pipeline, measures the return water temperature of described water return pipeline;
Cold water flow meter, is arranged on described cold device place, measures the cold water flow of described cold device;
Return water temperature feedforward controller, the return water temperature of the described water return pipeline measured by described return water temperature meter, calculates and exports the first power control signal;
Cold water flow feedforward controller, the cold water flow of the described cold device measured by described cold water flow meter, calculates and exports the second power control signal;
Cold water temperature controller, the cold water temperature of the described supply channel measured by described cold water temperature meter, calculates and exports the 3rd power control signal;
Adder, sues for peace to described first, second and the 3rd power control signal, the value after summation is exported as power control signal.
3. control system according to claim 1 and 2, is characterized in that,
Described primary pump frequency-converting control device comprises:
Cold water temperature meter, is arranged on described supply channel, measures the cold water temperature of described supply channel;
Water flow temperature transfinites controller, for the cold water temperature measured according to described cold water temperature meter, calculates and exports the first frequency change control signal;
Confession backwater differential pressure measurement unit, for measuring the confession backwater differential pressure of described air-conditioning system;
Confession backwater differential pressure controller, according to described for the confession backwater differential pressure value measured by backwater differential pressure computing unit, calculate and exports for backwater differential pressure control signal;
Cold water flow meter, is arranged on described cold device place, measures the cold water flow of described cold device;
Cold water flow controller, according to described for backwater differential pressure controller export for backwater differential pressure control signal as the cold water flow measured by cold water flow duty setting signal and described cold water flow meter, calculate and output flow control signal;
Frequency conversion Staged cotrol device, according to the flow control signal that described cold water flow controller exports, calculates output second frequency change control signal;
The low selector of signal, the low signal of signal value in select described water flow temperature to transfinite the first frequency change control signal that controller exports and the second frequency change control signal that described frequency conversion Staged cotrol device exports, exports as primary pump control signal;
Primary pump controller, according to the primary pump control signal that the low selector of described signal exports, carries out VFC to described primary pump.
4. control system according to claim 3, is characterized in that,
Cold water Minimum Flow Control device comprises, and backflow Staged cotrol device, according to the flow control signal that described cold water flow controller exports, calculates the control signal exporting return valve on balance pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520570434.5U CN204943785U (en) | 2015-07-31 | 2015-07-31 | Be applicable to the vari-able flow control system of air-conditioning Variable flow system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520570434.5U CN204943785U (en) | 2015-07-31 | 2015-07-31 | Be applicable to the vari-able flow control system of air-conditioning Variable flow system |
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| CN204943785U true CN204943785U (en) | 2016-01-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105066342A (en) * | 2015-07-31 | 2015-11-18 | 新智能源系统控制有限责任公司 | Variable-flow control system applicable to primary pump system of air conditioner |
-
2015
- 2015-07-31 CN CN201520570434.5U patent/CN204943785U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105066342A (en) * | 2015-07-31 | 2015-11-18 | 新智能源系统控制有限责任公司 | Variable-flow control system applicable to primary pump system of air conditioner |
| CN105066342B (en) * | 2015-07-31 | 2017-10-20 | 新智能源系统控制有限责任公司 | Suitable for the vari- able flow control system of air-conditioning Variable flow system |
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