CN109855281A - Air-conditioning heat transfer device and air conditioner - Google Patents
Air-conditioning heat transfer device and air conditioner Download PDFInfo
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- CN109855281A CN109855281A CN201811516705.3A CN201811516705A CN109855281A CN 109855281 A CN109855281 A CN 109855281A CN 201811516705 A CN201811516705 A CN 201811516705A CN 109855281 A CN109855281 A CN 109855281A
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Abstract
The present invention proposes a kind of air-conditioning heat transfer device and air conditioner, heat-exchanger rig includes the multiple heat exchangers being arranged in parallel, multiple heat exchangers are independently arranged the electric expansion valve that can be used to control cold medium flux, it further include processor and memory, computer program is stored in memory, it can be realized following steps when program is executed by processor: collecting the parameter inside air-conditioning with environment, and adjusted coefficient K is obtained according to parameter；Heat exchanger associated temperature and compressor related pressure are detected, and compared with preset value, the knots modification of electronic expansion valve opening is calculated；The knots modification, Current electronic expansion valve opening EVO (n) and correction factor of electronic expansion valve opening are calculated, calculated value EVO (n+1) is obtained, electronic expansion valve opening is regulated and controled according to calculated value EVO (n+1)；It repeats the above steps, persistently regulates and controls electric expansion valve.Air conditioner of the invention uses above-mentioned air-conditioning heat transfer device.The present invention can be realized the balanced, efficient of air conditioner heat exchange.
Description
Technical field
The invention belongs to field of air conditioning more particularly to a kind of air-conditioning heat transfer devices and air conditioner.
Background technique
With the development of air-conditioning, compact development is presented in multi-connected machine, and unit area refrigerating capacity/heating capacity is constantly promoted,
The heat exchange area of middle heat exchanger is one of the key factor for restricting unit performance.Heat exchanger is divided into two parts, can increase and change
Hot device heat exchange area, while the pressure loss of the refrigerant in heat exchanger is reduced, promote heat exchanger heat exchange efficiency.
Chinese invention patent CN107631515A, heat pump air conditioner unit, including compressor, four-way valve, outdoor heat exchanger and
Indoor heat exchanger, the first port of the high-pressure exhaust connection four-way valve of compressor, the third port and outdoor heat exchange of four-way valve
Device, indoor heat exchanger, four-way valve the 4th port be sequentially connected, the low pressure air suction of the second port connect compressor of four-way valve
Mouthful, it is characterised in that: outdoor heat exchanger includes in the First Heat Exchanger and the second heat exchanger, First Heat Exchanger and room being arranged in parallel
It is equipped with the first electric expansion valve between interior heat exchanger, the second electric expansion valve is equipped between the second heat exchanger and indoor heat exchanger.
In above-mentioned patent, only illustrate air-conditioner set under different operating conditions heat exchanger by different electronic expansion valve openings into
Row is adjusted, and undisclosed specific control method can not achieve equilibrium, the high efficient heat exchanging of two heat exchangers.
Summary of the invention
The present invention for above-mentioned air-conditioner set heat exchanger cannot it is balanced, efficiently utilize the technical issues of, propose it is a kind of
Weighing apparatus, the air-conditioning heat transfer device and air conditioner for efficiently controlling multiple heat exchangers.
In order to achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of air-conditioning heat transfer device, including the multiple heat exchangers being arranged in parallel, the multiple heat exchanger has been independently arranged
The electric expansion valve that can be used to control cold medium flux further includes processor and memory, calculating is stored in the memory
Machine program, described program can be realized following steps when being executed by the processor:
The relevant parameter inside air-conditioning with environment is collected, and adjusted coefficient K is calculated according to parameter；
Heat exchanger associated temperature and compressor related pressure are detected respectively, and compared with preset value, it is swollen that electronics is calculated
The knots modification of swollen valve opening；
The knots modification, Current electronic expansion valve opening EVO (n) and correction factor of electronic expansion valve opening are counted
It calculates, obtains calculated value EVO (n+1), electronic expansion valve opening is regulated and controled according to calculated value EVO (n+1)；
Into next control loop, it is above-mentioned that calculated value EVO (n+1) replaces Current electronic expansion valve opening EVO (n) repetition
Step persistently regulates and controls electric expansion valve.
Preferably, the processor executes the knots modification that electronic expansion valve opening is calculated in program, also when refrigeration
The following steps are included:
Heat exchanger associated temperature includes heat exchanger liquid pipe temperature Te, detect heat exchanger liquid pipe temperature Te, and with preset saturation
Temperature Tsc is compared to obtain Te-Tsc, and the first knots modification Δ of electronic expansion valve opening is calculated according to the value of Te-Tsc
EVO1；
Compressor related pressure includes pressure at expulsion Pd, detect Compressor Discharge Pressure Pd, and with target exhaust pressure Pdc
It is compared to obtain Pd-Pdc, the second knots modification Δ EVO2 of electronic expansion valve opening is calculated according to the value of Pd-Pdc.
Electronic expansion valve opening is adjusted according to calculated value EVO (n+1) in program preferably, the processor executes
Control, comprising the following steps:
Electronic expansion valve opening calculated value is obtained according to formula EVO (n+1)=(EVO (n)+Δ EVO1+ Δ EVO2) × K
EVO (n+1), calculated value EVO (n+1) are compared with electronic expansion valve opening minimum value EVOmin and maximum value EVOmax；
When EVO (n+1) is not more than EVOmin, electronic expansion valve opening is set as EVOmin；
When EVO (n+1) is not less than EVOmax, electronic expansion valve opening is set as EVOmax；
When EVO (n+1) is other values, electronic expansion valve opening is set as EVO (n+1).
Preferably, the processor executes the knots modification that electronic expansion valve opening is calculated in program, also when heating
The following steps are included:
Heat exchanger associated temperature includes heat exchanger tracheae temperature Tg, detect heat exchanger tracheae temperature Tg, and with preset evaporation
Temperature Tso is compared to obtain Tg-Tso, and the third knots modification Δ of electronic expansion valve opening is calculated according to the value of Te-Tsc
EVO3；
Compressor related pressure includes pressure of inspiration(Pi) Ps, detection compressor arrange inspiratory force Ps, and with target pressure of inspiration(Pi) Psc
It is compared to obtain Ps-Psc, the 4th knots modification Δ EVO4 of electronic expansion valve opening is calculated according to the value of Ps-Psc；
Heat exchanger associated temperature includes heat exchanger liquid pipe temperature Te, detect heat exchanger liquid pipe temperature Te, and with heat exchanger gas
Tube temperature degree Tg is compared to obtain Tg-Te, and the 5th variable Δ of electronic expansion valve opening is calculated according to the value of Tg-Te
EVO5。
Electronic expansion valve opening is adjusted according to calculated value EVO (n+1) in program preferably, the processor executes
Control, comprising the following steps:
Electronic expansion valve opening is obtained according to formula EVO (n+1)=(EVO (n)+Δ EVO3+ Δ EVO4+ Δ EVO5) × K
Calculated value EVO (n+1), calculated value EVO (n+1) and electronic expansion valve opening minimum value EVOmin and maximum value EVOmax are compared
Compared with；
When EVO (n+1) is not more than EVOmin, electronic expansion valve opening is set as EVOmin；
When EVO (n+1) is not less than EVOmax, electronic expansion valve opening is set as EVOmax；
When EVO (n+1) is other values, electronic expansion valve opening is set as EVO (n+1).
Preferably, it is environment temperature adjusted coefficient K ta, frequency that the processor, which executes the adjusted coefficient K for including in program,
Rate adjusted coefficient K hz and delivery temperature adjusted coefficient K td one of them or multinomial product.
A kind of air conditioner, using any of the above-described air-conditioning heat transfer device.
Compared with prior art, the advantages and positive effects of the present invention are:
Air-conditioning heat transfer device is provided with two heat exchangers of independent control, related according to heat exchanger associated temperature and compressor
Pressure data realizes the regulation of heat exchanging device, guarantees the equilibrium of heat-exchanger rig efficiently.Use environment temperature correction coefficient, frequency are repaired
The correction factors such as positive coefficient are modified electronic expansion valve opening, guarantee the accuracy controlling of heat exchanger.Air-conditioning heat transfer device is adopted
It is designed with double heat exchanger in parallel, under same heat exchange power, the present invention has higher heat exchange efficiency, and the pipe range that exchanges heat
Spend shorter, reduction process costs.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is air-conditioning heat transfer device schematic illustration；
Heat-exchanger rig executes the flow chart of program when Fig. 2 is refrigeration；
The flow chart of heat-exchanger rig control method when Fig. 3 is heating；
Fig. 4 is Air Conditioning Cycle schematic illustration.
In above each figure, 1 is heat exchanger；11 be heat exchanger liquid pipe；12 be heat exchanger tracheae；2 be electric expansion valve；3 are
Compressor；4 be oil eliminator；5 be four-way valve；6 be gas-liquid separator.
Specific embodiment
In the following, the present invention is specifically described by illustrative embodiment.It should be appreciated, however, that not into one
In the case where step narration, element, structure and features in an embodiment can also be advantageously incorporated into other embodiments
In.
Term " first ", " second " be used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or
Implicitly indicate the quantity of indicated technical characteristic." first " is defined as a result, the feature of " second " can be expressed or imply
Ground includes one or more of the features.
The multiple heat exchangers 1 being arranged in parallel in air-conditioning heat transfer device, the wind field and connecting line of heat exchanger 1 will not be complete
Symmetrically, cause to exchange heat in 1 operational process of heat exchanger and be unevenly unable to give full play the exchange capability of heat of each heat exchanger 1.The present invention
The heat exchanger 1 that a kind of air-conditioning heat transfer device is provided with multiple parallel connections is designed, each heat exchanger 1 is provided with electric expansion valve 2, wraps
Processor and memory are included, is stored with computer program in the memory, is independently controlled by processor execution；This
The air-conditioning heat transfer device of design is invented, it is right according to each heat exchanger 1 of the parameters accuracy controlling such as air-conditioning local environment and air-conditioning state
Electric expansion valve 2 (EVO) aperture answered adjusts cold medium flux and air-conditioning state perfect matching, is attained by each heat exchanger 1
Best heat transfer effect.In specific embodiment as depicted in figs. 1 and 2, there are two heat exchangers in parallel for air-conditioning heat transfer device setting
1, processor is the processor of outdoor unit.
When refrigeration, outdoor unit heat exchanger 1 is condenser, and when carrying out refrigeration work, refrigerant is pressed in compressor 3
Contracting after the refrigerant gas of low-temp low-pressure is compressed into the superheated steam of high temperature and pressure, is discharged by 3 exhaust outlet of compressor.It flows through
Oil eliminator 4 enters in condenser from the import of four-way valve 5.The superheated vapor of high temperature and pressure is cooled down within the condenser, is led to
The cooling heat spreading function of outdoor fan is crossed, the refrigerant of overheat is changed into liquid by gaseous state.Refrigerant liquid is through electric expansion valve 2
The refrigerant liquid of low-temp low-pressure is flowed into indoor unit by reducing pressure by regulating flow.Refrigerant liquid absorbs heat vaporization after indoor unit, surrounding
The temperature of temperature declines, and cold wind is blown into interior by indoor fan.Refrigerant after gasification sends outdoor unit back to again, passes through four-way valve
5 communicate with 3 air intake duct of compressor, so that refrigerant gas be enable to be sucked back in compressor 3 by 3 air entry of compressor, again by
It is compressed into the superheated steam of high temperature and pressure, maintains refrigeration cycle.When heating, outdoor unit heat exchanger 1 is evaporator.It is being heated
When work, the high-temperature high-pressure overheat steam compressed through compressor 3 is discharged by the exhaust outlet of compressor 3, flows through oil eliminator 4, then
It is sent directly into indoor unit by four-way valve 5, indoor unit plays the role of condensation at this time, and the steam of overheat passes through the heat dissipation of indoor unit
Afterwards, the heat to shed is blown out by indoor fan.The liquid of cryogenic high pressure is formed after superheated steam is cooling, refrigerant liquid is through electronics
2 reducing pressure by regulating flow of expansion valve flows into the refrigerant liquid of low-temp low-pressure in outdoor unit heat exchanger 1.The refrigerant of low-temp low-pressure exists
Here the process of vaporization is completed, refrigerant liquid outwardly absorbs a large amount of heat, becomes dry saturation vapor again, and by outdoor wind
Fan is blown out cold air by outdoor unit.Dry saturation vapor finally returns to 3 air entry of compressor by 3 air intake duct of connect compressor, continues
Second of heating circulation.Wherein, the refrigerant of 6 pairs of disengaging compressors of gas-liquid separator carries out gas-liquid separation.
Air-conditioning heat transfer device of the invention, and each heat exchanger 1 is used as an independent control unit, acquisition, processing are respective
The relevant parameter of heat exchanger 1 independently executes respective control program by the differentiation of parameter label, controls electronic expansion
The aperture of valve 2 makes respective heat exchanger 1 be in the state of high efficient heat exchanging, to reach the heat exchange property optimum control of system, locates
It manages device and executes program different in storage medium when freezing and heating two kinds.When refrigeration, the execution of outdoor unit processor is deposited
Program in storage media, as shown in Fig. 2, performing the steps of
The range of air conditioner electronic expansion valve opening is set, maximum value EVOmax and electronics including electronic expansion valve opening are swollen
The minimum value EVOmin of swollen valve opening.When air-conditioning is started to work, electronic expansion valve opening initialization, Current electronic expansion valve opening
For EVO (n).
Outdoor unit processor receives inside the collected air-conditioning of each sensor and the relevant parameter of environment, including current
Parameters, the outdoor unit processors such as 3 delivery temperature of environment temperature, 3 frequency of compressor and compressor handle above-mentioned parameter
Obtain environment temperature adjusted coefficient K ta, frequency adjusted coefficient K hz and delivery temperature adjusted coefficient K td.
Outdoor unit processor obtains the testing result Te of 11 temperature of heat exchanger liquid pipe, and outdoor unit processor is by heat exchanger liquid pipe
11 temperature Te are compared to obtain Te-Tsc with preset saturation temperature Tsc.Outdoor unit processor to difference Te-Tsc at
Reason, obtains the first knots modification Δ EVO1 of electronic expansion valve opening.When difference Te-Tsc > 0, show the heat exchange of outdoor heat exchanger 1
The high-temperature gas refrigerant for flowing through this heat exchanger 1 be condensed into liquid by scarce capacity, corresponding electronic expansion valve opening at this time
Variable Δ EVO1 < 0 is changed, electronic expansion valve opening reduces, and the coolant quantity for flowing through this heat exchanger 1 is reduced with this.Difference Te-Tsc <
When 0, show that the high-temperature gas refrigerant for flowing through this heat exchanger 1 can be condensed into liquid completely by the exchange capability of heat of outdoor heat exchanger 1,
The exchange capability of heat of heat exchanger 1 fails to play completely, at this time corresponding electronic expansion valve opening the first knots modification Δ EVO1 > 0, electronics
Expansion valve opening increases, and increases the coolant quantity for flowing through this heat exchanger 1 with this, gives full play to the exchange capability of heat of heat exchanger 1.Difference
When Te-Tsc=0, show that 1 exchange capability of heat of heat exchanger is just adapted to cold medium flux, at this time corresponding electronic expansion valve opening
Variable Δ EVO1=0 is changed, electronic expansion valve opening remains unchanged, and keeps current cold medium flux.
By above-mentioned control, outdoor each heat exchanger 1 can be made to have an optimal cold medium flux to reach most efficiently
Heat exchange, but system condensing pressure can also have deviation at this time, cause the condensation temperature in heat exchanger 1 that cannot match heat exchange, lead
Cause system control parameters fluctuation, since condensing pressure and 3 pressure at expulsion of compressor are consistent substantially, introduce compressor 3
The pressure of exhaust outlet --- pressure at expulsion Pd participates in the coordinated control of electric expansion valve 2.
Outdoor unit processor obtains the testing result Pd of 3 pressure at expulsion of compressor, and outdoor unit processor is by pressure at expulsion Pd
It is compared to obtain Pd-Pdc with preset target exhaust pressure Pdc.Outdoor unit processor handles difference Pd-Pdc, obtains
To the second knots modification Δ EVO2 of electronic expansion valve opening.Pressure at expulsion difference is provided with multiple sections, including Δ Pd1, Δ Pd2
And other sections, corresponding different 3 state of compressor are adapted to the knots modification of different electronic expansion valve openings to it, including
A, B and 0, wherein A > B > 0.When difference Pd-Pdc falls in pressure range Δ Pd1, show exhaust pressure ratio goal pressure be higher by compared with
It is more, correspond to corresponding the second knots modification of electronic expansion valve opening Δ EVO2=A at this time, electronic expansion valve opening increase amplitude compared with
Greatly, pressure at expulsion is reduced rapidly.When difference Pd-Pdc falls in pressure range Δ Pd2, show that exhaust pressure ratio goal pressure is higher by
Less, corresponding the second knots modification of electronic expansion valve opening Δ EVO2=B at this time, it is smaller that electronic expansion valve opening increases amplitude,
Reduce pressure at expulsion.When difference Pd-Pdc is other values, pressure at expulsion is indicated compared to goal pressure, pressure at expulsion is also in suitable
In the range of matching, corresponding the second knots modification of electronic expansion valve opening Δ EVO2=0 is corresponded at this time, and electronic expansion valve opening is kept
It is constant.
Cooperate the adjusting of indoor throttling set by outdoor unit electric expansion valve 2, jointly to 3 exhaust pressure of compressor and system
Cold medium flux does comprehensive adjustment.Reach the efficient matchings of system condensing pressure and 1 heat exchange efficiency of outdoor heat exchanger.
In above-mentioned control result, it is sufficiently introduced into its for the influence outdoor heat exchange that above-mentioned outdoor unit processor is handled
His factor: outdoor environment temperature Ta, influencing the 3 frequency Hz of compressor of flow and be related to the delivery temperature Td of 3 safety of compressor,
Related correction factor is fitted, further closed-loop automatic control amendment is carried out to the whole aperture of electric expansion valve 2.
Outdoor unit is according to current electronic expansion valve opening EVO (n), the first knots modification Δ of electronic expansion valve opening
EVO1, the second knots modification Δ EVO2 of electronic expansion valve opening, environment temperature adjusted coefficient K ta, frequency adjusted coefficient K hz and
Delivery temperature adjusted coefficient K td is calculated；Bring above-mentioned parameter into formula:
EVO (n+1)=(EVO (n)+Δ EVO1+ Δ EVO2) × Kta × Kh × Ktd
The calculated value EVO (n+1) of electronic expansion valve opening is obtained, calculated value EVO (n+1) is electronic expansion under current state
The theoretic optimum value of valve opening.Since electronic expansion valve opening presence can only be set in the section of EVOmin to EVOmax,
Calculated value EVO (n+1) is compared with electronic expansion valve opening minimum value EVOmin and maximum value EVOmax.EVO (n+1) is no
When greater than EVOmin, electronic expansion valve opening EVO (n) is set as EVOmin；When EVO (n+1) is not less than EVOmax, electronic expansion
Valve opening EVO (n) is set as EVOmax；When EVO (n+1) is other values, electronic expansion valve opening EVO (n) is set as EVO (n+
1)。
Electric expansion valve 2 is regulated and controled according to updated electronic expansion valve opening EVO (n), is adapted to cold medium flux
Current air-conditioning state.Updated electronic expansion valve opening EVO (n) substitutes into above-mentioned steps, realizes to electric expansion valve 2
Lasting regulation, makes heat-exchanger rig be in the state of efficient operation always.
When heating, outdoor unit processor executes program in storage medium, as shown in figure 3, performing the steps of
The range of air conditioner electronic expansion valve opening is set, maximum value EVOmax and electronics including electronic expansion valve opening are swollen
The minimum value EVOmin of swollen valve opening.When air-conditioning is started to work, electronic expansion valve opening initialization, Current electronic expansion valve opening
For EVO (n).
Outdoor unit processor receives inside the collected air-conditioning of each sensor and the relevant parameter of environment, including current
The parameters such as 3 delivery temperature of environment temperature, 3 frequency of compressor and compressor, outdoor unit processing handle to above-mentioned parameter
To environment temperature adjusted coefficient K ta, frequency adjusted coefficient K hz and delivery temperature adjusted coefficient K td.
In heating operations, outdoor heat exchanger 1 is evaporator, therefore the gaseous coolant Tg that can be exported by heat exchanger 1
The evaporation situation of value changed to infer refrigerant in outdoor evaporator, determines whether cold medium flux is suitable, steams in outdoor heat exchanger 1
When distributing complete, Tg can directly whether evaporating temperature be suitable outside for reaction chamber.And the reliability in order to guarantee compressor 3, prevent
Only 3 hydraulic compression of compressor increases this temperature the safe definite value of a degree of superheat Tsh
Outdoor unit processor obtains the testing result Tg of 12 temperature of heat exchanger tracheae, the i.e. gaseous coolant of the outlet of heat exchanger 1
Tg is compared to obtain Tg-Tso by Tg, outdoor unit processor with evaporating temperature Tso.Wherein, Tso is the practical steaming of system operation
Temperature is sent out, the 3 pressure of inspiration(Pi) Ps of compressor that can be run by physical properties table with unit is derived by.Outdoor unit processor
Difference Tg-Tso is handled, the third knots modification Δ EVO3 of electronic expansion valve opening is obtained.
The process specifically handled is that difference Tg-Tso is compared with degree of superheat Tsh, and wherein degree of superheat Tsh is one fixed
When value.When Tg-Tso < Tsh, show that the refrigerant state in 1 exit of heat exchanger is the gas-liquid mixed state containing certain liq, evaporation
Not exclusively, 1 exchange capability of heat of outdoor heat exchanger is not able to satisfy, at this time corresponding electronic expansion valve opening third knots modification Δ EVO3 <
0, electronic expansion valve opening reduces, and the coolant quantity for flowing through this heat exchanger 1 is reduced with this.When Tg-Tso > Tsh, show that heat exchanger 1 goes out
The refrigerant state at mouthful place is the pure gaseous state overheated, flows through the refrigerant of heat exchanger 1 evaporating completely, and outdoor heat exchanger 1 is also
Certain heat exchange surplus, corresponding electronic expansion valve opening third knots modification Δ EVO3 < 0, electronic expansion valve opening increase at this time,
Increase the coolant quantity for flowing through this heat exchanger 1 with this.When difference Tg-Tso=Tsh, illustrate changing for cold medium flux and outdoor heat exchanger 1
Thermal energy power is just adapted to, at this time corresponding electronic expansion valve opening third knots modification Δ EVO3=0, and electronic expansion valve opening is not
Become, the coolant quantity for currently flowing through this heat exchanger 1 is kept with this.
It is controlled by above-mentioned EVO, when outdoor heat exchanger 1 is as evaporator, there has also been optimal heat exchange state and efficiency,
But the evaporating temperature whether evaporating temperature of whole system is optimal, also can efficiency to whole system and heat exchanger 1
There are certain influences for heat exchange state, therefore the 3 pressure of inspiration(Pi) Ps of compressor for introducing characterization evaporating temperature carries out coupling control.
Outdoor unit processor obtains the testing result Ps of 3 pressure of inspiration(Pi) of compressor, and outdoor unit processor is by pressure of inspiration(Pi) Ps
It is compared to obtain Ps-Psc with preset target pressure of inspiration(Pi) Psc.Outdoor unit processor handles difference Ps-Psc, obtains
To the 4th knots modification Δ EVO4 of electronic expansion valve opening.Pressure of inspiration(Pi) difference is provided with multiple sections, including Δ Ps1, Δ Ps2
And other sections, corresponding different 3 state of compressor are adapted to the knots modification of different electronic expansion valve openings to it, including
C, S and 0, wherein C > S > 0.When difference Ps-Psc falls in pressure range Δ Ps1, pressure of inspiration(Pi) is lower than goal pressure more out,
Corresponding the 4th knots modification Δ EVO4=C of electronic expansion valve opening is corresponded at this time, and electronic expansion valve opening increase amplitude is larger, fast
Speed improves pressure of inspiration(Pi).When difference Ps-Psc falls in pressure range Δ Ps2, show that pressure of inspiration(Pi) is lower than goal pressure less out,
Corresponding the 4th knots modification Δ EVO2=D of electronic expansion valve opening at this time, electronic expansion valve opening increase amplitude is smaller, improves and inhales
Atmospheric pressure.When difference Ps-Psc is other values, indicate pressure of inspiration(Pi) compared to goal pressure, model of the pressure of inspiration(Pi) also in adaptation
In enclosing, corresponding the 4th knots modification Δ EVO4=0 of electronic expansion valve opening is corresponded at this time, electronic expansion valve opening remains unchanged.
Since the changeable and pressure change temperature detection of operating condition is there are deviation, spy introduces the gas-liquid pipe temperature difference and comes to entire cold
Matchmaker's flow properly carries out supplement judgement and further protects compressor 3 not by liquid hammer.Because evaporator inlet is gas-liquid mixed
Refrigerant, temperature is equal to the evaporating temperature of refrigerant at this pressure, therefore tube temperature degree Te and enters orotracheal tube temperature by working off one's feeling vent one's spleen
The difference of degree Tg is determined.
12 temperature Tg of heat exchanger tracheae is compared to obtain Tg- by outdoor unit processor with 11 temperature Te of heat exchanger liquid pipe
Te.Outdoor unit processor handles difference Tg-Te, obtains the 5th knots modification Δ EVO5 of electronic expansion valve opening.Difference
When Tg-Te < 0, shows that refrigerant stream is seriously excessive, at this time corresponding the 5th knots modification Δ EVO5 < 0 of electronic expansion valve opening, reduce
Electronic expansion valve opening reduces cold medium flux.When difference Tg-Te >=0, show that cold medium flux also in controlled range, does not need
Aperture amendment being carried out, at this time corresponding the 5th knots modification Δ EVO5=0 of electronic expansion valve opening, electronic expansion valve opening is constant,
Keep current cold medium flux.
Outdoor unit is according to current electronic expansion valve opening EVO (n), the third knots modification Δ of electronic expansion valve opening
The 4th knots modification Δ EVO4, the 5th knots modification Δ EVO5 of electronic expansion valve opening, environment temperature of EVO3, electronic expansion valve opening
Degree adjusted coefficient K ta, frequency adjusted coefficient K hz and delivery temperature adjusted coefficient K td are calculated；Bring above-mentioned parameter into public affairs
Formula:
EVO (n+1)=(EVO (n)+Δ EVO3+ Δ EVO4+ Δ EVO5) × Kta × Kh × Ktd
The calculated value EVO (n+1) of electronic expansion valve opening is obtained, calculated value EVO (n+1) is electronic expansion under current state
The theoretic optimum value of valve opening.Since electronic expansion valve opening presence can only be set in the section of EVOmin to EVOmax,
Calculated value EVO (n+1) is compared with electronic expansion valve opening minimum value EVOmin and maximum value EVOmax.EVO (n+1) is no
When greater than EVOmin, electronic expansion valve opening EVO (n) is set as EVOmin；When EVO (n+1) is not less than EVOmax, electronic expansion
Valve opening EVO (n) is set as EVOmax；When EVO (n+1) is other values, electronic expansion valve opening EVO (n) is set as EVO (n+
1)。
Electric expansion valve 2 is regulated and controled according to updated electronic expansion valve opening EVO (n), is adapted to cold medium flux
Current air-conditioning state.Updated electronic expansion valve opening EVO (n) substitutes into above-mentioned steps, realizes to electric expansion valve 2
Lasting regulation, makes heat-exchanger rig be in the state of efficient operation always.
Air-conditioning heat transfer device of the invention is using double heat exchanger design in parallel, under same heat exchange power, the present invention
With higher heat exchange efficiency, heat exchanger tube length is shorter.The factor for influencing the pressure loss is mainly flow velocity and pipe range, and flow velocity with
Flow is related, i.e. the factor of the influence pressure loss is mainly flow and pipe range.The pressure loss and flow it is square directly proportional, with pipe
Length is directly proportional.When being designed using two heat exchangers in parallel 1, it is assumed that the pipe range of single heat exchanger 1 is l, flow q；Then use two
The overall heat exchange device 1 that heat exchanger 1 welds together, due to for two independent heat exchangers 1 it is in parallel, therefore the pipe range of each heat exchanger 1
It is 1/2l, flow 1/2q, therefore the pressure loss of each heat exchanger 1 is 1/8th of single heat exchanger 1, crushing is significantly
Reduce, the heat exchange efficiency of heat exchanger 1 can get a promotion, while unit performance can also get a promotion.
It is controlled using aperture of the air-conditioning heat transfer device control method to the corresponding electric expansion valve 2 of each heat exchanger 1,
It being capable of opening according to the parameters accuracy controlling such as the air-conditioning local environment and air-conditioning state corresponding electric expansion valve 2 of each heat exchanger 1
Degree adjusts cold medium flux and air-conditioning state perfect matching, each heat exchanger 1 is made to be attained by best heat transfer effect.Of the invention
Air-conditioning heat transfer device can effectively avoid heat exchanger 1 wind field and connecting line non complete symmetry and caused by multiple heat exchangers
Exchange capability of heat is unbalanced between 1, is difficult to the problem of efficient operation.
The invention also includes a kind of air conditioner, using above-mentioned heat-exchanger rig, can effectively improve heat exchange efficiency and
Reduce cost.
More than, only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, and it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all cover
Within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (7)
1. a kind of air-conditioning heat transfer device, including the multiple heat exchangers being arranged in parallel, it is characterised in that: the multiple heat exchanger is only
The electric expansion valve for being equipped with and can be used to control cold medium flux is erected, further includes processor and memory, the memory memory
Computer program is contained, described program can be realized following steps when being executed by the processor:
The relevant parameter inside air-conditioning with environment is collected, and adjusted coefficient K is calculated according to parameter；
Heat exchanger associated temperature and compressor related pressure are detected respectively, and compared with preset value, electric expansion valve is calculated
The knots modification of aperture；
The knots modification, Current electronic expansion valve opening EVO (n) and correction factor of electronic expansion valve opening are calculated, obtained
To calculated value EVO (n+1), electronic expansion valve opening is regulated and controled according to calculated value EVO (n+1)；
Into next control loop, calculated value EVO (n+1) replaces Current electronic expansion valve opening EVO (n) and repeats above-mentioned step
Suddenly, persistently regulate and control electric expansion valve.
2. air-conditioning heat transfer device according to claim 1, which is characterized in that the processor executes to be calculated in program
The knots modification of electronic expansion valve opening, further comprising the steps of: when refrigeration, heat exchanger associated temperature includes heat exchanger liquid pipe temperature
Te detects heat exchanger liquid pipe temperature Te, and is compared to obtain Te-Tsc with preset saturation temperature Tsc, according to the value of Te-Tsc
The first knots modification Δ EVO1 of electronic expansion valve opening is calculated；
Compressor related pressure includes pressure at expulsion Pd, detects Compressor Discharge Pressure Pd, and carry out with target exhaust pressure Pdc
Compare to obtain Pd-Pdc, the second knots modification Δ EVO2 of electronic expansion valve opening is calculated according to the value of Pd-Pdc.
3. air-conditioning heat transfer device according to claim 2, which is characterized in that the processor executes in program according to calculating
Value EVO (n+1) regulates and controls electronic expansion valve opening, comprising the following steps:
Electronic expansion valve opening calculated value EVO (n+ is obtained according to formula EVO (n+1)=(EVO (n)+Δ EVO1+ Δ EVO2) × K
1), calculated value EVO (n+1) is compared with electronic expansion valve opening minimum value EVOmin and maximum value EVOmax；
When EVO (n+1) is not more than EVOmin, electronic expansion valve opening is set as EVOmin；
When EVO (n+1) is not less than EVOmax, electronic expansion valve opening is set as EVOmax；
When EVO (n+1) is other values, electronic expansion valve opening is set as EVO (n+1).
4. air-conditioning heat transfer device according to claim 1, which is characterized in that the processor executes to be calculated in program
The knots modification of electronic expansion valve opening, further comprising the steps of: when heating, heat exchanger associated temperature includes heat exchanger tracheae temperature
Tg detects heat exchanger tracheae temperature Tg, and is compared to obtain Tg-Tso with preset evaporating temperature Tso, according to the value of Te-Tsc
The third knots modification Δ EVO3 of electronic expansion valve opening is calculated；
Compressor related pressure includes pressure of inspiration(Pi) Ps, and detection compressor arranges inspiratory force Ps, and carries out with target pressure of inspiration(Pi) Psc
Compare to obtain Ps-Psc, the 4th knots modification Δ EVO4 of electronic expansion valve opening is calculated according to the value of Ps-Psc；
Heat exchanger associated temperature includes heat exchanger liquid pipe temperature Te, detect heat exchanger liquid pipe temperature Te, and with heat exchanger tracheae temperature
Degree Tg is compared to obtain Tg-Te, and the 5th variable Δ EVO5 of electronic expansion valve opening is calculated according to the value of Tg-Te.
5. air-conditioning heat transfer device according to claim 4, which is characterized in that the processor executes in program according to calculating
Value EVO (n+1) regulates and controls electronic expansion valve opening, comprising the following steps:
Electronic expansion valve opening is obtained according to formula EVO (n+1)=(EVO (n)+Δ EVO3+ Δ EVO4+ Δ EVO5) × K to calculate
Value EVO (n+1), calculated value EVO (n+1) are compared with electronic expansion valve opening minimum value EVOmin and maximum value EVOmax；
When EVO (n+1) is not more than EVOmin, electronic expansion valve opening is set as EVOmin；
When EVO (n+1) is not less than EVOmax, electronic expansion valve opening is set as EVOmax；
When EVO (n+1) is other values, electronic expansion valve opening is set as EVO (n+1).
6. air-conditioning heat transfer device according to claim 1, it is characterised in that: include in the processor execution program repairs
Positive coefficient K be environment temperature adjusted coefficient K ta, frequency adjusted coefficient K hz and delivery temperature adjusted coefficient K td one of them or
Multinomial product.
7. a kind of air conditioner, it is characterised in that: using the air-conditioning heat transfer device any in claim 1 to 6.
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