CN105004011B - Suitable for the vari- able flow control system of air-conditioning Primary pump system - Google Patents
Suitable for the vari- able flow control system of air-conditioning Primary pump system Download PDFInfo
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- CN105004011B CN105004011B CN201510464537.8A CN201510464537A CN105004011B CN 105004011 B CN105004011 B CN 105004011B CN 201510464537 A CN201510464537 A CN 201510464537A CN 105004011 B CN105004011 B CN 105004011B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention provides the vari- able flow control system suitable for air-conditioning Primary pump system, is related to refrigeration control field, to improve air-conditioning system cold power and accuracy during hydraulic balancing regulation, energy-saving and invent.Including cold device, for/water return pipeline, air-conditioning system and balance pipeline, air-conditioning system includes one or more air conditioning terminals in parallel, and air conditioning terminal is the polytype including fan coil, is additionally provided with the two grades of water pumps supplied water to air conditioning terminal；Water return pipeline is provided with one-level water pump；Also include one-level variable frequency control device of water pump and two grades of variable frequency control device of water pump, one-level variable frequency control device of water pump is used for the reflux ratio of calculated equilibrium pipeline, and according to reflux ratio, VFC is carried out to one-level water pump；Two grades of variable frequency control device of water pump are used for the equivalent valve seat opening value for calculating fan coil cold valves, and according to air-conditioning system cold valves valve seat opening value, VFC is carried out to two grades of water pumps.The present invention is available in the converter technique of air-conditioning system.
Description
Technical field
The present invention relates to handpiece Water Chilling Units control field, more particularly to a kind of variable-flow control suitable for air-conditioning Primary pump system
System processed.
Background technology
At present, one-level variable frequency pump, two grades of frequency conversions are used most of handpiece Water Chilling Units, particularly Large Central Air Conditioning System system more
The converter technique of water pump.
This is because, as shown in figure 1, traditional one-level water pump system is as follows：Including water chilling unit system, (i.e. cold is filled
Put), one-level water pump group, supply channel and water return pipeline, wherein, supply channel includes water main 5 and is arranged in parallel supplying water
Multiple water supply pipes 2 on house steward 5, water return pipeline includes return main 6 and is arranged in parallel multiple backwater on return main 6
It is in charge of 3, water chilling unit system includes the multiple handpiece Water Chilling Units 1 being arranged in parallel, water main 5 includes multiple water supply pipes 2, backwater
House steward 6 is in charge of 3 including multiple backwater, and one-level water pump group includes the multiple water pumps 4 being arranged in parallel, the outlet pipe of water chilling unit system
It is connected with the water inlet pipe of one-level water pump group, the outlet pipe of one-level water pump group, which collects, to be obtained water main 5 and be connected with water supply pipe 2,
And water chilling unit system is back to by the return main 6 for being in charge of 3 using backwater after user and being collected by return pipe recycled.
Although system system has, flow is simple, number of devices is less, cost is relatively low and the less advantage of floor space, can not be right
All users accomplish to supply on demand, especially in Large Central Air Conditioning System project, except the user farthest apart from cold device,
Remaining most of user relies primarily on the artificial decompression measure such as valve and obtains suitable operting differential pressure, there is larger energy consumption and wastes
Phenomenon.
On the other hand, using two grades of water pump systems of converter technique due to the resistance difference suitable for each confession/water return pipeline
Larger environment, and two grades of pump heads of each confession/water return pipeline can carry out according to the resistance of corresponding confession/water return pipeline
Selection, so that alleviating whole pump heads in traditional type water system all needs to show by energy waste caused by index circuit selection
As, wherein, the loop refers to be in charge of constituted water circulation path by each water supply pipe and backwater.As shown in Fig. 2 being existing
A kind of Water flow-path figure for the two grades of pump variable frequency systems having.Two grades of pump variable frequency systems include handpiece Water Chilling Units 1, with handpiece Water Chilling Units
1 corresponds and is arranged on one-level water pump 9 on its outlet pipeline, the outlet pipe of one-level water pump 9 collect after with the phase of water main 5
Even, supply channel 2 is provided with two grades of water pump groups, and two grades of water pump groups include at least two two grades of water pumps 10 being arranged in parallel, and supply
Balance pipe 11 is provided between supply mains 5 and return main 6.Wherein, one-level water pump 9 is used to overcome the water resistance in cold device,
Two grades of water pumps 10 are used to overcome cold device exterior line and the water resistance of each local loop, due to accomplishing to a certain extent
Supply on demand to user, thus significantly improve energy consumption wasting phenomenon.
In the control system for two grades of water pump systems of air-conditioning, in order to really overcome energy consumption to waste, at least need from cold
Acc power is adjusted and cold water conveys two aspects and started with, and realizes that the cold equilibrium of supply and demand and hydraulic equilibrium are most basic requirement, mesh
Before have the technologies of two aspects, one is the cold power regulation technology based on air conditioner load, and it is calculated according to the load of air-conditioning
Handpiece Water Chilling Units set value of the power, realizes that cold supply is effectively matched with air conditioner load；Two be hydraulic equilibrium two stage pump frequency conversion control
It is to be determined to supply backwater differential pressure setpoint according to air-conditioning system heating power least favorable loop to have one kind in technology processed, existing correlation technique,
This setting value is maintained to realize by adjusting branch's two stage pump frequency conversion rotating speed, its concrete principle is so that heating power is most in air-conditioning system
The cold water valve seat opening in unfavorable loop is maintained at larger opening, by reducing cold water pipe resistance, reaches reduction two stage pump conveying
The purpose of energy, and meet the burden requirement of each air conditioning terminal.
But, the air conditioning design load calculation value that above-mentioned cold power regulation technology is based on, generally according to water supply flow and confession
Backwater temperature difference calculates what is come, and its reliability is used for a long time in flow instrument and the degree of accuracy is difficult to guarantor and levied, while for air conditioner load
The supply water temperature of calculating and return water temperature are because for water return pipeline length is different, flow velocity difference is clearly present the time difference, and this time difference is
Change, factors above often destroys the accuracy of air conditioning design load calculation, so as to cause load adjustment to have deviation, supply and demand
Balance is difficult to real foundation；And above-mentioned hydraulic equilibrium two stage pump frequency conversion control technique depends on the maximum valve seat opening of air conditioning terminal,
Thus it is suitable only for the cold valves air-conditioning system application scenario using stroke continuously adjustable, it is impossible to be applicable for being powered using two
The fan coil cooling unit of magnet valve, exist regulation accuracy it is not good so that be difficult to regulation the problem of.
In summary, in the cold power and hydraulic balancing regulation technology of above-mentioned existing air-conditioning system, above-mentioned technology is equal
The problem of there is cold power and not good hydraulic balancing regulation accuracy.
The content of the invention
In view of this, it is an object of the invention to provide a kind of vari- able flow control system suitable for air-conditioning Primary pump system
System, for ensuring accuracy when cold power and hydraulic balancing regulation, so that it is energy-saving, complicated answer can be applied to
Use occasion.
To achieve the above object, there is provided a kind of variable-flow suitable for air-conditioning Primary pump system for the first aspect of the present invention
Control system, including cold device, be connected to the cold device delivery port supply channel, be connected to the cold device
The water return pipeline of water inlet, the air-conditioning system that is arranged between the supply channel and the water return pipeline and with it is described
The balance pipeline that air-conditioning system is arranged in parallel；
Wherein, the air-conditioning system includes one or more air conditioning terminals in parallel, and the air conditioning terminal is to include blower fan
Polytype including coil pipe, and provided with the two grades of water pumps supplied water to the air conditioning terminal；The water return pipeline is provided with use
In the one-level water pump air-conditioning system to cold device backwater；
The control system also includes one-level variable frequency control device of water pump, for the reflux ratio of calculated equilibrium pipeline, and
According to the reflux ratio, VFC is carried out to the one-level water pump；
The control system also includes two grades of variable frequency control device of water pump, all air-conditionings end in the air-conditioning system
Valve seat opening maximum in cold water regulating valve is held, VFC is carried out to two grades of water pumps.
In the first possible implementation of the first aspect of the present invention, the one-level variable frequency control device of water pump bag
Include：
Cold water temperature measurement table, is arranged on the supply channel, and the cold water temperature measurement table is located at described supply water
The upstream of pipeline and the balance line connection, measures and is located at the supply channel and the balance pipe in the supply channel
The upstream water flow temperature of road junction；
Two grades of water pump cold water temperature measurement tables are gone, are arranged on the supply channel, and described remove two grades of water pump cold water temperatures
The downstream that measurement table is located at the supply channel and the balance line connection is spent, is measured described in being located in the supply channel
The downstream water flow temperature of supply channel and the balance line connection；
User's return water temperature measurement table, is arranged on the water return pipeline, and user's return water temperature measurement table is located at
The upstream of the water return pipeline and the balance line connection, measures and is located at the water return pipeline and institute in the water return pipeline
State the upstream water flow temperature of balance line connection；
Return water temperature measurement table, is arranged on the water return pipeline, and the return water temperature measurement table is located at the backwater
The downstream of pipeline and the balance line connection, measures and is located at the water return pipeline and the balance pipe in the water return pipeline
The downstream water flow temperature of road junction；
Balance pipe coolant-temperature gage measurement table, is arranged on the balance pipeline, measures the water flow temperature of the balance pipeline；
Balance pipe reflux ratio calculator, according to the cold water temperature measurement table, go two grades of water pump cold water temperature measurement tables,
The temperature that user's return water temperature measurement table, return water temperature measurement table and balance pipe coolant-temperature gage measurement table are measured respectively, is calculated
Balance pipe reflux ratio；
Reflux ratio controller, the reflux ratio calculated according to the balance pipe reflux ratio calculator, to the one-level
Water pump carries out VFC.
In second of possible implementation of the first aspect of the present invention, two grades of variable frequency control device of water pump bags
Include：
The equivalent valve seat opening computing unit of fan coil, for calculating equivalent valve seat opening value；
Maximum value signal selector, receives the equivalent valve position that the equivalent valve seat opening computing unit of fan coil is calculated
The cold valves aperture value of other air conditioning terminals in opening value, and same air-conditioning system in addition to fan coil, selection is described
Equivalent valve seat opening value and the maximum in the cold valves aperture value, are used as the output of maximum value signal selector；
Cold valves valve positioner, the maximum exported according to the maximum value signal selector, to described two grades
Water pump carries out VFC.
Vari- able flow control system provided in an embodiment of the present invention suitable for air-conditioning Primary pump system, due to supplying water and returning
Multiple temperature measurement equipments such as cold water temperature measurement table, return water temperature measurement table, and these temperature are respectively arranged with water lines
The water flow temperature that degree measuring apparatus is measured, is transferred to balance pipe reflux ratio calculator, for calculated equilibrium pipe reflux ratio,
So as to take full advantage of the parameter that cold water temperature, return water temperature etc. reflect air conditioner load comprehensively, this reflux ratio can be very timely
Ground reflects the balanced degree of cold power and air conditioner load, and thus ratio changes primary pump frequency conversion rotating speed to realize to cold power
Adjustment, cold power can be made more to be matched with load, thus with obvious energy-saving effect, on this basis, pass through and set
The equivalent valve seat opening computing unit of fan coil on fan coil calculates its equivalent valve seat opening value, so as to further solve
Two grades of water pumps are carried out variable frequency adjustments, Neng Goushi by the measurement problem of the valve seat opening under complicated applications occasion based on this
The service requirement of complicated applications occasion is answered, Optimum Hydraulic balance has been reached, the purpose of water-delivery pump energy consumption is reduced, improves user's body
Test.
Brief description of the drawings
The schematic diagram for the air-conditioning one-level water pump system that Fig. 1 provides for prior art；
The schematic diagram for two grades of water pump systems of air-conditioning that Fig. 2 provides for prior art；
Fig. 3 is the schematic diagram of two grades of water pump systems of air-conditioning of the embodiment of the present invention；
Fig. 4 is the schematic diagram of the control system of two grades of water pump systems of air-conditioning of the embodiment of the present invention；
Fig. 5 is the schematic diagram of the one-level variable frequency control device of water pump of control system shown in Fig. 4 in systems；
Fig. 6 is the schematic diagram of two grades of variable frequency control device of water pump of the control system shown in Fig. 5 in systems；
Fig. 7 is the schematic diagram of the two stage pump frequency-converting control device of the control system shown in Fig. 6 in systems；
Fig. 8 is the principle explanatory diagram of the one-level variable frequency control device of water pump of the control system of the embodiment of the present invention；
Fig. 9 is the principle explanatory diagram of two grades of variable frequency control device of water pump of the control system of the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
First, the embodiment of the present invention provides a kind of control system of two grades of water pump systems of air-conditioning.Below by way of specific reality
Example is applied the control system of two grades of water pump systems of air-conditioning provided in an embodiment of the present invention is described in detail.
For the ease of understanding the present invention, the operation principle to two grades of water pump systems of air-conditioning of the present invention gives letter below
Illustrate.As shown in figure 3, two grades of water pump systems of air-conditioning are made up of a water pump system and secondary water pump system.Water pump system
System mainly includes refrigeration machine 10a, 10b, one-level chilled water pump 101a, 101b；Secondary water pump system mainly includes two grades of chilled waters
Pump 201a~201d, air conditioning terminal 20a, 20b；Water collector 30 and water knockout drum 40 belong to a water pump system and secondary water pump altogether
System.Secondary water pump system is typically made up of two or more loop, is supplied water per loop by one group of chilled water pump, wherein, the ring
Road refers to the path being made up of each supply channel and water return pipeline.As shown in figure 3, in the figure, two grades of chilled water pump 201a
Belong to different loops from 201d.In two grades of water pump systems of air-conditioning shown in Fig. 3, two grades of chilled water pumps in each loop
Lift can be selected according to respective loops resistance, such as two grades of chilled water pump 201a in Fig. 3 and 201d can be respectively to respective ring
Road selects different lifts, therefore, and this system is more suitable for the system that each loop resistance differs larger, so as to solve
Whole pump heads all need to waste energy problem by caused by index circuit selection in traditional type water system.In addition, for
Conventional art identical content, is repeated no more below.
Such as background technology proposed as in the one-level variable frequency pump of prior art, two grades of variable frequency pumps, based on sky
The cold power adjustment technology of load is adjusted, because air conditioner load is difficult to obtain accurate calculated value, the cold equilibrium of supply and demand is difficult to realize；
So if being controlled by the cold power adjustment technology of the air conditioner load in background technology, then quality is controlled to be difficult to protect
Card；And for existing hydraulic equilibrium two stage pump frequency conversion control technique, because it is necessarily dependent upon the cold of stroke continuously adjustable
The application scenario of water valve air-conditioning system, it is impossible to be applicable for the fan coil cooling unit using two-way electromagnetic valve, and there is water
Dynamic balance adjusts reasonability and is difficult to ensure that, the problem of Hydraulic transportation energy consumption is too high.
The cardinal principle of the embodiment of the present invention is, in the control of two grades of water pump systems of air-conditioning provided in an embodiment of the present invention
In system, according to designed balance pipe reflux ratio calculator, cold water flow is adjusted according to reflux ratio and then is implemented cold
Acc power is adjusted, and according further to the equivalent aperture of designed fan coil cold valves, in face of with fan unit piping
During the hybrid a/c system of system, each two grades of pump variable frequency rotating speeds are adjusted according to the valve opening in heating power least favorable loop；Optimize water
Dynamic balance, reduces cold water pipe resistance and then reduces cold water conveying energy, reach the purpose for realizing energy-conservation, enable to adapt to complicated
The service requirement of application scenario.
Specifically, for the problems of above-mentioned background technology, the embodiment of the present invention provides a kind of two grades of water of air-conditioning
The control system of pumping system, as shown in figure 4, the supply channel including cold device 10, the delivery port for being connected to cold device 10
L1, the water return pipeline L2 for being connected to the water inlet of cold device 10, the sky being arranged between supply channel L1 and water return pipeline L2
The adjusting system L4 and balance pipeline L3 being arranged in parallel with air-conditioning system L4；
Wherein, air-conditioning system L4 includes one or more air conditioning terminals 20 in parallel, and air conditioning terminal is to include fan coil
Polytype inside；Air-conditioning system L4 supply channel is provided with the two grades of water pump Ps 20 supplied water to air conditioning terminal 20；Return pipe
Being provided with the L2 of road is used for the one-level water pump P 10 to the backwater of cold device 10.Control system also includes one-level pump variable frequency and controls dress
C10 is put, for calculated equilibrium pipeline L3 reflux ratio, and according to reflux ratio, VFC is carried out to one-level water pump P 10；
Control system also includes two grades of variable frequency control device of water pump C20, for calculating the equivalent valve seat opening value of fan coil,
And according to the cold of other air conditioning terminals in the equivalent valve seat opening value of fan coil and same air-conditioning system in addition to fan coil
Two grades of water pump Ps 20 are carried out VFC by water valve opening value.
The course of work to the above embodiment of the present invention is briefly explained below.Cold device 10 is in one-level water pump P 10
VFC under, current are supplied to supply channel L1, current flow through supply channel L1 and supplied to two grades of water pump Ps 20, with
And each air conditioning terminal 20 in air-conditioning system L4, and finally flow back to cold device 10 via water return pipeline L2.Here, current by
Supply channel is supplied and by during water return pipeline is returned, when unbalanced supply-demand, and current can flow through balance pipeline L3, this hair
Bright embodiment is that the reflux ratio for balancing pipeline L3 is calculated by one-level variable frequency control device of water pump C10, and according to meter
Result is calculated, VFC is carried out to one-level water pump P 10.In addition, two grades of variable frequency control device of water pump C20 of the embodiment of the present invention,
The simulation that valve seat opening can be carried out to each fan coil in air-conditioning system L4 is calculated, and is obtained equivalent to other types air-conditioning
The equivalent valve seat opening value of cold valves aperture, so that according to the cold water valve seat opening of corresponding air conditioning terminal 20 in air-conditioning system L4
Two grades of water pump Ps 20 are carried out VFC by value.
In this regard, the example of a concrete application scene as the embodiment of the present invention, as shown in figure 5, in this embodiment,
One-level variable frequency control device of water pump C10 includes：
Cold water temperature measurement table T1, is arranged on supply channel on L1, and cold water temperature measurement table T1 is located at supply channel
It is located at the upper of water lines L1 and balance pipeline L3 junctions in L1 and the upstream of balance pipeline L3 junctions, measurement supply channel L1
Swim water flow temperature.As shown in Figure 5, cold water temperature measurement table T1 is arranged on supply channel L1, while positioned at the feed pipe
The left side of supply channel L1 and balance pipeline L3 junctions in the L1 of road.
Two grades of water pump cold water temperature measurement table T3 are removed, are arranged on supply channel L1, and go two grades of water pump cold water temperature surveys
Scale T3 be located in the downstream of supply channel L1 and balance pipeline L3 junctions, measurement supply channel L1 be located at supply channel L1 and
Balance the downstream water flow temperature of pipeline L3 junctions.As shown in Figure 5, two grades of water pump cold water temperature measurement table T3 are gone to be arranged on
On supply channel L1, while supply channel L1 and the right side for balancing pipeline L3 junctions in supply channel L1.
User return water temperature measurement table T4, is arranged on water return pipeline L2, and user's return water temperature measurement table T4 is located at back
It is located at water return pipeline L2 in water lines L2 and the upstream of balance pipeline L3 junctions, measurement water return pipeline L2 and balance pipeline L3 connects
Connect the upstream water flow temperature at place.As shown in Figure 5, user's return water temperature measurement table T4 is arranged on water return pipeline L2, simultaneously
The right side of water return pipeline L2 and balance pipeline L3 junctions in water return pipeline L2.
Return water temperature measurement table T2, is arranged on water return pipeline L2, and return water temperature measurement table T2 is located at water return pipeline L2
With the downstream of balance pipeline L3 junctions, measure and be located in water return pipeline L2 under water return pipeline L2 and balance pipeline L3 junctions
Swim water flow temperature.As shown in Figure 5, return water temperature measurement table T2 is arranged on water return pipeline L2, while positioned at the return pipe
The left side of water return pipeline L2 and balance pipeline L3 junctions in the L2 of road.
Balance pipe coolant-temperature gage measurement table T5, is arranged on balance pipeline L3, measurement balance pipeline L3 water flow temperature；
Balance pipe reflux ratio calculator C1, according to cold water temperature measurement table T1, goes two grades of water pump cold water temperature measurement tables
What T3, user's return water temperature measurement table T4, return water temperature measurement table T2 and balance pipe coolant-temperature gage measurement table T5 were measured respectively
Temperature, calculated equilibrium pipe reflux ratio；
Reflux ratio controller A1, the reflux ratio calculated according to balance pipe reflux ratio calculator C1, to one-level water pump
P10 carries out VFC.
For example, in one particular embodiment of the present invention, as shown in figure 8, T1a, T2a, T3a, T4a, T5a distinguish
It is cold water temperature measurement table T1, return water temperature measurement table T2, goes two grades of water pump cold water temperature measurement table T3, user's return water temperature to survey
Scale T4 and the temperature signal of balance pipe coolant-temperature gage T5 measurement tables output, it is collectively as balance pipe reflux ratio calculator C1's
Input；
For Fig. 4, in two grades of water pump systems of air-conditioning of the present invention, according to equation of heat balance, when T5a is equal to T4a
When, by balancing the backwater return flow in pipeline L3 with going the cold water flow ratio CCR of two grades of water pumps as follows：
CCR=(T3a-T1a)/(T4a-T1a)
Similarly, when T5a does not wait T4a, by balancing the cold-water reflux flow in pipeline L3 and removing cold circling water flow rate ratio
Rate CRR is as follows：
CRR=(T4a-T2a)/(T4a-T1a)
When T5a is equal to T4a, reflux ratio RR=CCR；
When T5a does not wait T4a, reflux ratio RR=-CRR；
Balance pipe reflux ratio calculator C1 output RR is connected to reflux ratio controller as reflux ratio measured value
A1 input, reflux ratio controller A1 setting value is set to 0, reflux ratio controller A1 output signal T1sp conducts
One-level variable frequency pump P10 control signal.Reflux ratio controller A1 can use pid control algorithm, the embodiment of the present invention to this only
For example, it is not particularly limited.
In addition, fan coil is the preferable end prod of central air-conditioning, by heat exchanger, water pipe, filter, fan connects
Water pond, air bleeding valve, the composition such as support, its operation principle is the continuous air in room where recycling in unit, leads to air
It is subcooled after water coil and is cooled, keeps the constant of room temperature.Specifically, fan coil air-conditioner end is according to room temperature
And the deviation of design temperature, according to fixed logic, is opened and closed cold water two-way electromagnetic valve and adjusts fan high speed, middling speed, low speed
Gear, it is clear that in all run mode automatic identifications, fan open in high speed mode cold water magnetic valve heat exchange amount be it is maximum,
Because fan coil typically uses the design of two-way electromagnetic valve, thus it is difficult to obtain two-way electromagnetic valve using in the prior art
Valve seat opening.
Because two-port valve only has conducting and cut-off two states, opening for adjustable gate is obtained like that different from regulating valve
Degree, therefore, in order to weigh " aperture " of two-port valve, introduces the concept of equivalent valve seat opening value in the present invention.The present invention be for
Find and ask in air-conditioning system or branch road cold valves position maximum in all air conditioning terminals, thus to fan coil equivalent valve position
The calculating of opening value can be reduced to the make-and-break status information Wi according to two-way electromagnetic valve to calculate.
In this regard, in one particular embodiment of the present invention there is provided a kind of processing mode to two-way electromagnetic valve, such as scheming
Shown in 6, in one particular embodiment of the present invention, two grades of variable frequency control device of water pump include：Open the equivalent valve position of fan coil
Computing unit C2 is spent, for calculating equivalent valve seat opening value；Two stage pump frequency-variable controller A2, for according to equivalent valve seat opening
Value carries out VFC to two grades of water pumps.
Further, in one of the invention more specifically embodiment, as shown in fig. 7, two stage pump frequency-variable controller A2 is also
Including：Open the equivalent valve position that maximum value signal selector S1, the reception equivalent valve seat opening computing unit C2 of fan coil are calculated
The cold valves aperture signal of other air conditioning terminals in angle value, and air-conditioning system in addition to fan coil, selects the equivalent valve
The maximum of position opening value and valve seat opening in cold valves aperture value, and according to described in maximum value signal selector output
Maximum, specifically, cold valves valve positioner S2 measured value is used as using this maximum；Cold valves valve positioner S2,
According to the maximum of the maximum value signal selector S1 valve seat openings exported, VFC is carried out to two grades of water pump Ps 20.
For example, as shown in figure 9, Wi (i=1~m) is each fan coil system two-way electromagnetic valve in air-conditioning system
On off operating mode signal, the status signal be ON/OFF types, it is used as the equivalent valve seat opening computing unit C2's of fan coil
Input variable.Vi (i=1~m) is the equivalent valve seat opening computing unit C2 of fan coil output variable, and Vi calculated values are as follows
Value, i.e.,：In a controlling cycle, the ratio between fan coil two-way electromagnetic valve ON time and total run time multiply in 100%.Ui
(i=1~n) is to be subordinate to other air conditioners such as combined air conditioning box, PAU in same air-conditioning system with fan coil
The cold valves aperture of group, Ui and Vi are in the lump as maximum value signal selector S1 input, and maximum value signal selector S1 is used for
The maximum in all signals, but not limited to this are selected, the mode of selection signal can be entered according to the burden requirement of different units
Row adjustment.UV is maximum value signal selector S1 output, and specifically UV is all inputs in maximum value signal selector S1
Maximum, so as to be selected and be exported to cold valves valve positioner S2 input by maximum value signal selector S1, as
Cold valves valve positioner S2 measured value, cold valves valve positioner S2 setting value typically chooses high level, and such as scope exists
90%~95%, cold valves valve positioner S2 output valve are connected to two grades of water pumps of two grades of water pump Ps 20 or branch, for controlling
Two stage pump frequency conversion rotating speed.Here, cold valves valve positioner S2 can use pid algorithm, but not limited to this, for example, can also select
With other algorithms such as PI algorithms.
In summary, the central air conditioner system of frequency conversion, the embodiment of the present invention are used for handpiece Water Chilling Units primary pump, two stage pump
Cold water flow can be adjusted according to the capacity of returns of balance pipe and then implements the adjustment of cold power, cold and air-conditioning can be effectively set up
Between supply and demand energy balance, reach the purpose of energy-conservation, the reflux ratio calculator that the present invention is designed is measured independent of situ flow
Instrument is measured, and can be according to the reflux ratio and backflow direction calculated.
The present invention is in face of the hybrid air-conditioning system containing combined air conditioning box unit, PAU and fan coil system
System, for fan coil system, by the two-way electromagnetic valve ON time and the ratio of total run time of calculating, to characterize blower fan
The equivalent aperture of coil pipe cold valves, solves what is run into according to the valve position in heating power least favorable loop to carry out hydraulic balancing regulation
Fan coil cold valves aperture can not direct measurement or expression problem, adjust each according to the valve opening in heating power least favorable loop
Branch's two stage pump frequency conversion rotating speed, and then reached the purpose for reducing two stage pump energy consumption.
Finally, it is necessary to which what is illustrated is, although illustrate each controller and temperature in described above by taking integrated device as an example
Measurement table is illustrated, still, they can be integrated in an integrated controller, or respectively to should integrated controller
Each functional module, the embodiment of the present invention is not limited this.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (3)
1. a kind of vari- able flow control system suitable for air-conditioning Primary pump system, including cold device, it is connected to the cold dress
The supply channel for the delivery port put, be connected to the cold device water inlet water return pipeline, be arranged on the supply channel
Air-conditioning system between the water return pipeline and the balance pipeline being arranged in parallel with the air-conditioning system；Characterized in that,
The air-conditioning system includes multiple air conditioning terminals in parallel, and the multiple air conditioning terminal in parallel includes combined air conditioning box
Unit, PAU and fan coil, and provided with the two grades of water pumps supplied water to the multiple air conditioning terminal in parallel；Institute
Stating water return pipeline and being provided with is used for the one-level water pump to the cold device backwater；
The control system also includes one-level variable frequency control device of water pump, for the reflux ratio of calculated equilibrium pipeline, and according to
The reflux ratio, VFC is carried out to the one-level water pump；
The control system also includes two grades of variable frequency control device of water pump, and all air conditioning terminals in the air-conditioning system are cold
Valve seat opening maximum in water regulating valve, VFC is carried out to two grades of water pumps.
2. control system according to claim 1, it is characterised in that the one-level variable frequency control device of water pump includes：
Cold water temperature measurement table, is arranged on the supply channel, and the cold water temperature measurement table is located at the supply channel
With the upstream of the balance line connection, measure and be located at the supply channel and balance pipeline company in the supply channel
Connect the upstream water flow temperature at place；
Two grades of water pump cold water temperature measurement tables are gone, are arranged on the supply channel, and described go the survey of two grades of water pump cold water temperatures
Scale is located at the downstream of the supply channel and the balance line connection, measures and is located at described supply water in the supply channel
The downstream water flow temperature of pipeline and the balance line connection；
User's return water temperature measurement table, is arranged on the water return pipeline, and user's return water temperature measurement table is positioned at described
The upstream of water return pipeline and the balance line connection, measures and is located at the water return pipeline in the water return pipeline and described flat
The upstream water flow temperature of weighing apparatus line connection；
Return water temperature measurement table, is arranged on the water return pipeline, and the return water temperature measurement table is located at the water return pipeline
With the downstream of the balance line connection, measure and be located at the water return pipeline and balance pipeline company in the water return pipeline
Connect the downstream water flow temperature at place；
Balance pipe coolant-temperature gage measurement table, is arranged on the balance pipeline, measures the water flow temperature of the balance pipeline；
Balance pipe reflux ratio calculator, according to the cold water temperature measurement table, goes two grades of water pump cold water temperature measurement tables, users
The temperature that return water temperature measurement table, return water temperature measurement table and balance pipe coolant-temperature gage measurement table are measured respectively, calculated equilibrium
Pipe reflux ratio；
Reflux ratio controller, the reflux ratio calculated according to the balance pipe reflux ratio calculator, to the one-level water pump
Carry out VFC.
3. control system according to claim 2, it is characterised in that two grades of variable frequency control device of water pump include：
The equivalent valve seat opening computing unit of fan coil, for calculating equivalent valve seat opening value；
Maximum value signal selector, receives the equivalent valve seat opening that the equivalent valve seat opening computing unit of fan coil is calculated
Value, and other air conditioning terminals in same air-conditioning system in addition to fan coil cold valves aperture value, select it is described equivalent
Valve seat opening value and the maximum in the cold valves aperture value, are used as the output of maximum value signal selector；
Cold valves valve positioner, the maximum exported according to the maximum value signal selector, to two grades of water pumps
Carry out VFC.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510464537.8A CN105004011B (en) | 2015-07-31 | 2015-07-31 | Suitable for the vari- able flow control system of air-conditioning Primary pump system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510464537.8A CN105004011B (en) | 2015-07-31 | 2015-07-31 | Suitable for the vari- able flow control system of air-conditioning Primary pump system |
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| CN105004011B true CN105004011B (en) | 2017-11-03 |
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|---|---|
| CN105004011A (en) | 2015-10-28 |
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