CN107606830A - A kind of electric expansion valve adjusting method - Google Patents
A kind of electric expansion valve adjusting method Download PDFInfo
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- CN107606830A CN107606830A CN201710790800.1A CN201710790800A CN107606830A CN 107606830 A CN107606830 A CN 107606830A CN 201710790800 A CN201710790800 A CN 201710790800A CN 107606830 A CN107606830 A CN 107606830A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
Electric expansion valve adjusting method provided by the invention, comprises the following steps：(a) refrigeration system degree of superheat regulation threshold value F is obtained；(b) degree of superheat SV is measurednValue, n is natural number；(c) according to the degree of superheat SV measured in step (b)nValue determine the operational mode of the electric expansion valve：As F f≤SVnDuring ＜ F+f, the electric expansion valve keeps current aperture constant；Work as SVnDuring ＜ F f, the electronic expansion valve opening reduces；Work as SVnDuring >=F+f, the electronic expansion valve opening increase；Wherein f is deviation.This control method detecting system data in system operation, with real-time change aperture system can be made more stable, when load and external condition change, system operation is set to maintain all the time in safe, rational condition range, improve performance driving economy of the system under the conditions of various power condition changings simultaneously, it is not perfect enough in extraneous environmental change period control method to overcome electric expansion valve in the prior art, it is impossible to the defects of making system time be in optimum state.
Description
Technical field
The present invention relates to refrigeration system control field, and in particular to a kind of electric expansion valve adjusting method.
Background technology
In refrigeration systems, evaporator, condenser, compressor and choke valve are essential four big in refrigeration system
Part.Refrigerant is inhaled into compressor adiabatic compression, turns into high temperature and high pressure gas, by condenser and choke valve, makes temperature and pressure
Power reduces, and enters back into the heat that evaporator takes away object to be cooled, compressor is flowed back to after being changed into low temperature low pressure gas.
Electric expansion valve is a kind of choke valve commonly used in the prior art, and electric expansion valve is controlled by controller, but
How by the way that when load and external condition change, the performance for ensureing refrigeration system technological requirement by appropriate control action refers to
Mark, and system operation is maintained all the time in safe, rational condition range, while system is improved in various power condition changing conditions
Under performance driving economy the problem of always all without more perfect solution.
The content of the invention
Therefore, the technical problem to be solved in the present invention be to overcome in the prior art electric expansion valve in extraneous environmental change
Period control method is not perfect enough, it is impossible to the defects of making system time be in optimum state, so as to provide one kind in load and outside
When condition changes, system operation is set to maintain all the time in safe, rational condition range, while improve system and become in various operating modes
The electric expansion valve adjusting method of performance driving economy under the conditions of dynamic.
The design of the present invention is as follows：
A kind of electric expansion valve adjusting method, comprises the following steps：(a) refrigeration system degree of superheat regulation threshold value F is obtained；
(b) degree of superheat SV is measurednValue, n is natural number；(c) according to the degree of superheat SV measured in step (b)nValue determine the electronics
The operational mode of expansion valve：As F-f≤SVnDuring ＜ F+f, the electric expansion valve keeps current aperture constant；Work as SVn＜ F-f
When, the electronic expansion valve opening reduces；Work as SVnDuring >=F+f, the electronic expansion valve opening increase；Wherein f is deviation.
Degree of superheat SV described in the step (b)nMeasuring method be：Measure the suction temperature T of compressorAir-breathingAnd evaporation
The coil temperature T of deviceCoil pipe, and calculate the degree of superheat SVn=TAir-breathing-TCoil pipe。
The regulation threshold value of the degree of superheat described in the step (a) F obtaining step is as follows：The system is run under nominal condition
Cooling system, several values are taken between -10 to 10 as interim degree of superheat regulation threshold value Fm, m is natural number, and presses step (c)
Runtime, and measure corresponding true degree of superheat SVmValue, selection with default degree of superheat SV0Face described in one of difference minimum
When degree of superheat regulation threshold value FmAs degree of superheat regulation threshold value F.
Preferably, any values of the deviation f between 1-5.
Preferably, interval the first setting time t1 regulations that the electric expansion valve performs step (c) once, are adjusted every time
For a cycle.
Preferably, the first setting time t1 is 60 seconds.
Preferably, the electric expansion valve is adjusted using stepper motor, and the amplitude peak of regulation walks for 8*f in each cycle.
Preferably, initial opening Q is also included before the step (a)0Setting：Q0=A+B*TEnvironment–γ*(C-TTarget)；When
TTargetDuring ＜ C, γ=γ1；Work as TTargetDuring >=C, γ=γ2；γ1＜ γ2；The initial opening is in minimum aperture and maximum opening
Between；Wherein, TEnvironmentEnvironment temperature is represented, γ is expressed as aperture coefficient, TTargetTarget temperature in expression system as reference object
Degree, A are constant value, and B is environment temperature coefficient, and C is the reference value of the target temperature.
Preferably, the constant value A is 230, and the environment temperature coefficient B is 3.5, and the reference object is the water heated
Case, the reference value C of the target temperature is 45 DEG C, γ1For 2, γ2For 20.
Preferably, when the refrigeration system enters defrosting mode, by the electronic expansion valve opening to maximum；When described
When refrigeration system exits defrosting mode, after making the electric expansion valve keep maximum opening to run the second setting time t2, then will
Before the aperture of the electric expansion valve is adjusted to defrosting and the 3rd setting time t3 is kept, is normally transported further according to step (c) afterwards
OK.
Preferably, the second setting time t2 is 60 seconds, and the 3rd setting time t3 is 120 seconds.
Preferably, when the compressor of the refrigeration system needs to close, current aperture is recorded as aperture Q before shutdownoff,
Electric expansion valve is opened to maximum opening Q afterwardsmax；When the compressor start, the setting time of maximum opening the 4th is kept
T4, aperture Q before then aperture is adjusted to the shutdownoffOr initial opening Q0In larger one, keep the 5th setting time
t5。
Preferably, the 4th setting time t4 is 30 seconds, and the 5th setting time t5 is 120 seconds.
Preferably, as environment temperature TEnvironmentWhen meeting following condition, the value that threshold value F is adjusted to the degree of superheat is modified
Obtain FAmendment=F+FEnvironmental correction, and the degree of superheat regulation threshold value F, wherein F in step of replacing (c)Environmental correctionFor Environment Correction Value：
Work as TEnvironment＞ TRing ginseng 1When, FEnvironmental correction=0；Work as TRing ginseng 2＜ TEnvironment≤TRing ginseng 1When, FEnvironmental correction=1；Work as TEnvironment≤TRing ginseng 2When, FEnvironmental correction=2；Its
Middle TRing ginseng 1For first environment reference temperature, TRing ginseng 2For second environment reference temperature.
Preferably, the first environment reference temperature TRing ginseng 1For 10 DEG C, the second environment reference temperature TRing ginseng 2For -5 DEG C.
Preferably, as the delivery temperature T of the compressorExhaustWhen meeting following condition, threshold value F is adjusted to the degree of superheat
Value be modified obtain FAmendment=F+FExhaust amendment, and the degree of superheat regulation threshold value F, wherein F in step of replacing (c)Exhaust amendmentFor
Delivery temperature correction value：Work as TExhaust＜ TRow's ginseng 1When, FExhaust amendment=0；Work as TRow's ginseng 1≤TExhaust＜ TRow's ginseng 2When, FExhaust amendment=-1；Work as TExhaust≥
TRow's ginseng 2When, FExhaust amendment=-2；Wherein TRow's ginseng 1For first exhaust reference temperature, TRow's ginseng 2For second exhaust reference temperature.
Preferably, the first exhaust reference temperature TRow's ginseng 1For 75 DEG C, the second exhaust reference temperature TRow's ginseng 2For 95 DEG C.
Preferably, methods described also includes delivery temperature rate-determining steps：As the delivery temperature TExhaustRise to first exhaust
Critical-temperature TRow faces 1When, the aperture locking of the electric expansion valve can only be opened and can not turned down greatly；As the delivery temperature TExhaustDecline
To second exhaust critical-temperature TRow faces 2When, electric expansion valve normal operation.
Preferably, the first exhaust critical-temperature TRow faces 1For 105 DEG C, the second exhaust critical-temperature TRow faces 2Than described
First exhaust critical-temperature TRow faces 1Low 5 DEG C.
Preferably, the delivery temperature control is further comprising the steps of：As the delivery temperature TExhaustFace more than the 3rd exhaust
Boundary temperature TRow faces 3When, the setting time t6 of electric expansion valve the 6th is forced to open greatly, and amplification is insurance opening value KInsurance；When described
Delivery temperature TExhaustDrop to the first exhaust critical-temperature TRow faces 1When low, the electric expansion valve normal operation.
Preferably, the 6th setting time t6 is 30 seconds, the insurance opening value KInsurance=δ * (TExhaust-TRow faces 1), wherein
Insure aperture coefficient δ and meet 1≤δ≤6.
Technical solution of the present invention, have the following advantages that：
1st, electric expansion valve adjusting method provided by the invention, comprises the following steps：(a) the refrigeration system degree of superheat is obtained to adjust
Save threshold value F；(b) degree of superheat SV is measurednValue, n is natural number；(c) according to the degree of superheat SV measured in step (b)nValue determine
The operational mode of the electric expansion valve：As F-f≤SVnDuring ＜ F+f, the electric expansion valve keeps current aperture constant；When
SVnDuring ＜ F-f, the electronic expansion valve opening reduces；Work as SVnDuring >=F+f, the electronic expansion valve opening increase；Wherein f is
Deviation.This control method detecting system data in system operation, with real-time change aperture system can be made more stable, in load
And during external condition change, system operation is set to maintain all the time in safe, rational condition range, while improve system various
Performance driving economy under the conditions of power condition changing, overcome in the prior art electric expansion valve in extraneous environmental change period control method
It is not perfect enough, it is impossible to the defects of making system time be in optimum state.Have one between regulation and feedback due to refrigeration system
Determine hysteresis quality, therefore can avoid adjusting excessively frequent or accommodative excess by setting deviation f.
2nd, electric expansion valve adjusting method provided by the invention, the regulation threshold value F's of the degree of superheat described in the step (a) obtains
Take step as follows：The refrigeration system is run under nominal condition, several values are taken between -10 to 10 as interim overheat
Degree regulation threshold value Fm, m is natural number, and presses step (c) runtime, and measures the corresponding degree of superheat SVnValue, selection
With corresponding SVnA minimum interim degree of superheat regulation threshold value Fm of difference is as degree of superheat regulation threshold value F.Pass through
When the method can be made using this degree of superheat regulation threshold value, the true degree of superheat of the system under nominal condition more levels off to reality
Demand.
3rd, electric expansion valve adjusting method provided by the invention, the electric expansion valve perform the interval first of step (c)
Setting time time t1 is adjusted once, is adjusted to a cycle every time, system disorders are caused so as to avoid system from frequently adjusting.
4th, electric expansion valve adjusting method provided by the invention, the step (a) also include initial opening Q before0Setting：
Q0=A+B*TEnvironment–γ*(C-TTarget)；Work as TTargetDuring ＜ C, γ=γ1；Work as TTargetDuring >=C, γ=γ2；γ1＜ γ2；It is described initial
Aperture is between minimum aperture and maximum opening；Wherein, TEnvironmentEnvironment temperature is represented, γ is expressed as aperture coefficient, TTargetRepresent system
Target temperature in system as reference object, A are constant value, and B is environment temperature coefficient, and C is the reference value of the target temperature.From
And the initial opening of electric expansion valve can be determined by environment temperature and target temperature, initial opening value is with environment temperature liter
It is high and increase, meanwhile, when reference value of the target temperature less than target temperature, using less aperture coefficient, work as target temperature
Higher than target temperature reference value when, just can be more stable into one when making system boot using larger aperture coefficient
State.
5th, electric expansion valve adjusting method provided by the invention, when the refrigeration system enters defrosting mode, by described in
Electronic expansion valve opening makes system that quickly frost be gone out in defrosting enlargement discharge to maximum；When the refrigeration system exits defrosting
During pattern, after making the electric expansion valve keep maximum opening to run the second setting time t2, then by the electric expansion valve
Before aperture is adjusted to defrosting and the 3rd setting time t3 is kept, afterwards further according to step (c) normal operation, due to the complete frost of rigidifying,
System is in low-voltage high-temperature state, so electric expansion valve, which is opened to maximum, first makes system balancing.
6th, electric expansion valve adjusting method provided by the invention, when the compressor of the refrigeration system needs to close, note
Current aperture is recorded as aperture Q before shutdownoff, electric expansion valve is opened to maximum opening Q afterwardsmax；When the compressor start
When, keep the setting time t4 of maximum opening the 4th, aperture Q before then aperture is adjusted to the shutdownoffOr initial opening Q0In compared with
Big one, the 5th setting time t5 is kept, so as to protect the start and stop under a safer aperture of each device of system.
7th, electric expansion valve adjusting method provided by the invention, as environment temperature TEnvironmentWhen meeting following condition, to the mistake
Temperature regulation threshold value F value, which is modified, obtains FAmendment=F+FEnvironmental correction, and the degree of superheat regulation threshold value in step of replacing (c)
F, wherein FEnvironmental correctionFor Environment Correction Value：Work as TEnvironment＞ TRing ginseng 1When, FEnvironmental correction=0；Work as TRing ginseng 2＜ TEnvironment≤TRing ginseng 1When, FEnvironmental correction=1；
Work as TEnvironment≤TRing ginseng 2When, FEnvironmental correction=2；Wherein TRing ginseng 1For first environment reference temperature, TRing ginseng 2For second environment reference temperature.System
Operationally the demand of the environment temperature difference degree of superheat is also different, makes system multipotency under high/low temperature steady by environment temperature amendment
Fixed operation.
8th, electric expansion valve adjusting method provided by the invention, as the delivery temperature T of the compressorExhaustMeet following bar
During part, the value that threshold value F is adjusted to the degree of superheat is modified acquisition FAmendment=F+FExhaust amendment, and it is described in step of replacing (c)
The degree of superheat adjusts threshold value F, wherein FExhaust amendmentFor delivery temperature correction value：Work as TExhaust＜ TRow's ginseng 1When, FExhaust amendment=0；Work as TRow's ginseng 1≤TExhaust＜
TRow's ginseng 2When, FExhaust amendment=-1；Work as TExhaust≥TRow's ginseng 2When, FExhaust amendment=-2；Wherein TRow's ginseng 1For first exhaust reference temperature, TRow's ginseng 2For second
It is vented reference temperature.Operationally compressor exhaust temperature has an impact system to the press life-span, by delivery temperature it is high when correct
The degree of superheat can be such that press exhaust is run in safe range.
9th, electric expansion valve adjusting method provided by the invention, in addition to delivery temperature rate-determining steps：When the exhaust temperature
Spend TExhaustRise to first exhaust critical-temperature TRow faces 1When, the aperture locking of the electric expansion valve can only be opened and can not turned down greatly；When
The delivery temperature TExhaustDrop to second exhaust critical-temperature TRow faces 2When, electric expansion valve normal operation, so as to prevent pressing
In the state of contracting machine excessive discharge temperature, electric expansion valve reduces aperture, causes compressor exhaust temperature to continue elevated possibility.
10th, electric expansion valve adjusting method provided by the invention, it is further comprising the steps of：As the delivery temperature TExhaustGreatly
In the 3rd exhaust critical-temperature TRow faces 3When, the setting time t6 of electric expansion valve the 6th is forced to open greatly, and amplification is insurance aperture
Value KInsurance；As the delivery temperature TExhaustDrop to the first exhaust critical-temperature TRow faces 1When low, the electric expansion valve is normal
Operation.So as in the state of compressor temperature is too high, electric expansion valve at interval of just increasing certain aperture for a period of time, so as to
Delivery temperature is recovered normal, protect system.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, in describing below
Accompanying drawing is some embodiments of the present invention, for those of ordinary skill in the art, before creative work is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the electric expansion valve adjusting method basic procedure schematic diagram of the present invention；
Fig. 2 is the optional schematic flow sheet of electric expansion valve adjusting method of the present invention.
Embodiment
Technical scheme is clearly and completely described below in conjunction with accompanying drawing.
Fig. 1 shows the basic flow sheet for the electric expansion valve adjusting method that a kind of specific embodiment of the present invention provides, Fig. 2
For the flow chart of preferred adjusting method.A kind of electric expansion valve adjusting method as shown in Figure 2, the refrigeration system applied is heat pump
System, comprise the following steps：(a) heat pump degree of superheat regulation threshold value F is obtained；(b) degree of superheat SV is measurednValue, n is nature
Number；(c) according to the degree of superheat SV measured in step (b)nValue determine the operational mode of the electric expansion valve：As F-f≤SVn
During ＜ F+f, the electric expansion valve keeps current aperture constant；Work as SVnDuring ＜ F-f, the electronic expansion valve opening reduces；When
SVnDuring >=F+f, the electronic expansion valve opening increase；Wherein deviation f is 3.This control method detects in system operation
System data, with real-time change aperture system can be made more stable, when load and external condition change, system operation is tieed up all the time
Hold in safety, rational condition range, while improve performance driving economy of the system under the conditions of various power condition changings, overcome
Electric expansion valve is not perfect enough in extraneous environmental change period control method in the prior art, it is impossible to system time is in optimal shape
The defects of state.Certain hysteresis quality between regulation and feedback due to heat pump be present, therefore can be kept away by setting deviation f
Exempt to adjust excessively frequent or accommodative excess.
Degree of superheat SV described in the step (b)nMeasuring method be：Measure the suction temperature T of compressorAir-breathingAnd evaporation
The coil temperature T of deviceCoil pipe, and calculate the degree of superheat SVn=TAir-breathing-TCoil pipe.The regulation threshold value of the degree of superheat described in the step (a) F
Obtaining step it is as follows：The heat pump is run under nominal condition, several values are taken between -10 to 10 as interim mistake
Temperature regulation threshold value Fm, m is natural number, and presses step (c) runtime, measures and is obtained using psychrometric chart corresponding true
Degree of superheat SVmValue, selection with default degree of superheat SV0A minimum interim degree of superheat regulation threshold value F of differencemAs institute
State degree of superheat regulation threshold value F.When can make to adjust threshold value using this degree of superheat by the method, system is true under nominal condition
The real degree of superheat more levels off to actual demand.
The electric expansion valve performs interval the first setting time t1 regulations of step (c) once, is adjusted to one every time
Cycle.The first setting time t1 is 60 seconds, and system disorders are caused so as to avoid system from frequently adjusting.The electric expansion valve
Adjusted using stepper motor, the amplitude peak of regulation walks for 8*f in each cycle.
Also include initial opening Q before the step (a)0Setting：Q0=A+B*TEnvironment–γ*(C-TTarget)；Work as TTargetDuring ＜ C,
γ=γ1；Work as TTargetDuring >=C, γ=γ2；γ1＜ γ2；The initial opening is between minimum aperture and maximum opening；Wherein,
TEnvironmentEnvironment temperature is represented, γ is expressed as aperture coefficient, TTargetTarget temperature in expression system as reference object, A is constant value,
B is environment temperature coefficient, and C is the reference value of the target temperature.Wherein described constant value A is 230, the environment temperature coefficient B
For 3.5, the reference object is the water tank heated, and the reference value C of the target temperature is 45 DEG C, γ1For 2, γ2For 20.
So as to determine the initial opening of electric expansion valve by environment temperature and target temperature, initial opening value is with environment temperature
Raise and increase, meanwhile, when target temperature is less than the reference value of target temperature, using less aperture coefficient, when target temperature
When degree is higher than the reference value of target temperature, using larger aperture coefficient, make more stable with regard to one can be entered during system boot
State.
When the heat pump enters defrosting mode, by the electronic expansion valve opening to maximum；When the heat pump system
System is when exiting defrosting mode, after making the electric expansion valve keep maximum opening to run the second setting time t2, then by the electricity
Before the aperture of sub- expansion valve is adjusted to defrosting and the 3rd setting time t3 is kept, afterwards further according to step (c) normal operation.It is described
Second setting time t2 is 60 seconds, and the 3rd setting time t3 is 120 seconds.Due to the complete frost of rigidifying, system is in low-voltage high-temperature
State, so electric expansion valve, which is opened to maximum, first makes system balancing.
When the compressor of the heat pump needs to close, current aperture is recorded as aperture Q before shutdownoff, afterwards will
Electric expansion valve is opened to maximum opening Qmax；When the compressor start, the setting time t4 of maximum opening the 4th is kept, then
Aperture Q before aperture is adjusted to the shutdownoffOr initial opening Q0In larger one, keep the 5th setting time t5.Described
Four setting time t4 are 30 seconds, and the 5th setting time t5 is 120 seconds, so as to protect each device of system safer at one
Start and stop under aperture.
As environment temperature TEnvironmentWhen meeting following condition, the value that threshold value F is adjusted to the degree of superheat is modified acquisition FAmendment
=F+FEnvironmental correction, and the degree of superheat regulation threshold value F, wherein F in step of replacing (c)Environmental correctionFor Environment Correction Value：Work as TEnvironment＞
TRing ginseng 1When, FEnvironmental correction=0；Work as TRing ginseng 2＜ TEnvironment≤TRing ginseng 1When, FEnvironmental correction=1；Work as TEnvironment≤TRing ginseng 2When, FEnvironmental correction=2；Wherein TRing ginseng 1For
First environment reference temperature, TRing ginseng 2For second environment reference temperature.The first environment reference temperature TRing ginseng 1For 10 DEG C, described
Two atmospheric reference temperature TRing ginseng 2For -5 DEG C.The demand of the system operationally environment temperature difference degree of superheat is also different, passes through environment
Temperature adjustmemt makes system multipotency stable operation under high/low temperature.
As the delivery temperature T of the compressorExhaustWhen meeting following condition, the value that threshold value F is adjusted to the degree of superheat is carried out
Amendment obtains FAmendment=F+FExhaust amendment, and the degree of superheat regulation threshold value F, wherein F in step of replacing (c)Exhaust amendmentFor delivery temperature
Correction value：Work as TExhaust＜ TRow's ginseng 1When, FExhaust amendment=0；Work as TRow's ginseng 1≤TExhaust＜ TRow's ginseng 2When, FExhaust amendment=-1；Work as TExhaust≥TRow's ginseng 2When,
FExhaust amendment=-2；Wherein TRow's ginseng 1For first exhaust reference temperature, TRow's ginseng 2For second exhaust reference temperature.The first exhaust is with reference to temperature
Spend TRow's ginseng 1For 75 DEG C, the second exhaust reference temperature TRow's ginseng 2For 95 DEG C.System operationally compressor exhaust temperature to the press longevity
Life has an impact, by delivery temperature it is high when the amendment degree of superheat press exhaust can be made to run in safe range.
Methods described also includes delivery temperature rate-determining steps：As the delivery temperature TExhaustRise to first exhaust stagnation temperature
Spend TRow faces 1When, the aperture locking of the electric expansion valve can only be opened and can not turned down greatly；As the delivery temperature TExhaustDrop to second
It is vented critical-temperature TRow faces 2When, electric expansion valve normal operation.The first exhaust critical-temperature TRow faces 1For 105 DEG C, described second
It is vented critical-temperature TRow faces 2Than the first exhaust critical-temperature TRow faces 1It is low 5 DEG C, too high in compressor exhaust temperature so as to prevent
Under state, electric expansion valve reduces aperture, causes compressor exhaust temperature to continue elevated possibility.As the delivery temperature TExhaust
More than the 3rd exhaust critical-temperature TRow faces 3When, the setting time t6 of electric expansion valve the 6th forces to open greatly, and amplification is opened for insurance
Angle value KInsurance；As the delivery temperature TExhaustDrop to the first exhaust critical-temperature TRow faces 1When low, the electric expansion valve is just
Often operation.The 6th setting time t6 is 30 seconds, the insurance opening value KInsurance=δ * (TExhaust-TRow faces 1), wherein insuring aperture
Coefficient δ meets 1≤δ≤6, and so as in the state of compressor temperature is too high, electric expansion valve at interval of just increasing for a period of time
Certain aperture, so as to progressively make delivery temperature recover normal, protect system.
It is pointed out that the control method of electric expansion valve provided by the present invention is not limited to the application in above-described embodiment
Used system is heat pump, can also be applied to other refrigeration systems, such as common refrigerated air-conditioning system.
It is pointed out that the concrete numerical value gone out given in above-described embodiment is only used as illustrating the preferred of control method
Embodiment, can be adjusted according to different condition and demand in actual motion, and use this control method, still can in load and
When external condition changes, system operation is set to maintain all the time in safe, rational condition range, while improve system in various works
Performance driving economy under the conditions of condition variation.
Obviously, above-described embodiment is only intended to clearly illustrate example, and is not the restriction to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change thus extended out or
Among changing still in the protection domain of the invention.
Claims (21)
1. a kind of electric expansion valve adjusting method, it is characterised in that comprise the following steps：
(a) refrigeration system degree of superheat regulation threshold value F is obtained；
(b) degree of superheat SV is measurednValue, n is natural number；
(c) according to the degree of superheat SV measured in step (b)nValue determine the operational mode of the electric expansion valve：
As F-f≤SVnDuring ＜ F+f, the electric expansion valve keeps current aperture constant；
Work as SVnDuring ＜ F-f, the electronic expansion valve opening reduces；
Work as SVnDuring >=F+f, the electronic expansion valve opening increase；
Wherein f is deviation.
2. according to the electric expansion valve adjusting method described in claim 1, it is characterised in that mistake described in the step (b)
Temperature SVnMeasuring method be：Measure the suction temperature T of compressorAir-breathingWith the coil temperature T of evaporatorCoil pipe, and calculate the mistake
Temperature SVn=TAir-breathing-TCoil pipe。
3. according to the electric expansion valve adjusting method described in claim 1 or 2, it is characterised in that described in the step (a)
Degree of superheat regulation threshold value F obtaining step is as follows：The refrigeration system is run under nominal condition, if being taken between -10 to 10
Dry value is as interim degree of superheat regulation threshold value Fm, m is natural number, and presses step (c) runtime, and is measured corresponding true
Degree of superheat SVmValue, selection with default degree of superheat SV0A minimum interim degree of superheat regulation threshold value F of differencemAs institute
State degree of superheat regulation threshold value F.
4. according to the electric expansion valve adjusting method described in claim any one of 1-3, it is characterised in that the deviation f
Arbitrary value between 1-5.
5. according to the electric expansion valve adjusting method described in claim any one of 1-4, it is characterised in that the electronic expansion
Valve performs interval the first setting time t1 regulations of step (c) once, is adjusted to a cycle every time.
6. according to the electric expansion valve adjusting method described in claim 5, it is characterised in that the first setting time t1 is
60 seconds.
7. according to the electric expansion valve adjusting method described in claim 5 or 6, it is characterised in that the electric expansion valve is adopted
Adjusted with stepper motor, the amplitude peak of regulation walks for 8*f in each cycle.
8. according to the electric expansion valve adjusting method described in claim any one of 1-7, it is characterised in that the step (a)
Also include initial opening Q before0Setting：
Q0=A+B*TEnvironment–γ*(C-TTarget)；
Work as TTargetDuring ＜ C, γ=γ1；
Work as TTargetDuring >=C, γ=γ2；
γ1＜ γ2；
The initial opening is between minimum aperture and maximum opening；
Wherein, TEnvironmentEnvironment temperature is represented, γ is expressed as aperture coefficient, TTargetTarget temperature in expression system as reference object
Degree, A are constant value, and B is environment temperature coefficient, and C is the reference value of the target temperature.
9. according to the electric expansion valve adjusting method described in claim 8, it is characterised in that the constant value A is 230, described
Environment temperature coefficient B is 3.5, and the reference object is the water tank heated, and the reference value C of the target temperature is 45 DEG C, γ1
For 2, γ2For 20.
10. according to the electric expansion valve adjusting method described in claim any one of 1-9, it is characterised in that：
When the refrigeration system enters defrosting mode, the electronic expansion valve opening is adjusted to maximum；
When the refrigeration system exits defrosting mode, the electric expansion valve is set to keep maximum opening to run the second setting time
After t2, then the aperture of the electric expansion valve is adjusted preceding to defrosting and keeps the 3rd setting time t3, afterwards further according to step
(c) normal operation.
11. according to the electric expansion valve adjusting method described in claim 10, it is characterised in that the second setting time t2
For 60 seconds, the 3rd setting time t3 was 120 seconds.
12. according to the electric expansion valve adjusting method described in claim any one of 1-11, it is characterised in that：
When the compressor of the refrigeration system needs to close, current aperture is recorded as aperture Q before shutdownoff, it is afterwards that electronics is swollen
Swollen valve is opened to maximum opening Qmax；
When the compressor start, the setting time t4 of maximum opening the 4th is kept, then aperture is opened before adjusting to the shutdown
Spend QoffOr initial opening Q0In larger one, keep the 5th setting time t5.
13. according to the electric expansion valve adjusting method described in claim 12, it is characterised in that the 4th setting time t4
For 30 seconds, the 5th setting time t5 was 120 seconds.
14. according to the electric expansion valve adjusting method described in claim any one of 1-13, it is characterised in that work as environment temperature
TEnvironmentWhen meeting following condition, the value that threshold value F is adjusted to the degree of superheat is modified acquisition FAmendment=F+FEnvironmental correction, and substitute step
Suddenly the degree of superheat regulation threshold value F, wherein F in (c)Environmental correctionFor Environment Correction Value：
Work as TEnvironment＞ TRing ginseng 1When, FEnvironmental correction=0；
Work as TRing ginseng 2＜ TEnvironment≤TRing ginseng 1When, FEnvironmental correction=1；
Work as TEnvironment≤TRing ginseng 2When, FEnvironmental correction=2；
Wherein TRing ginseng 1For first environment reference temperature, TRing ginseng 2For second environment reference temperature.
15. according to the electric expansion valve adjusting method described in claim 14, it is characterised in that the first environment is with reference to temperature
Spend TRing ginseng 1For 10 DEG C, the second environment reference temperature TRing ginseng 2For -5 DEG C.
16. according to the electric expansion valve adjusting method described in claim any one of 1-15, it is characterised in that when the compression
The delivery temperature T of machineExhaustWhen meeting following condition, the value that threshold value F is adjusted to the degree of superheat is modified acquisition FAmendment=F+
FExhaust amendment, and the degree of superheat regulation threshold value F, wherein F in step of replacing (c)Exhaust amendmentFor delivery temperature correction value：
Work as TExhaust＜ TRow's ginseng 1When, FExhaust amendment=0；
Work as TRow's ginseng 1≤TExhaust＜ TRow's ginseng 2When, FExhaust amendment=-1；
Work as TExhaust≥TRow's ginseng 2When, FExhaust amendment=-2；
Wherein TRow's ginseng 1For first exhaust reference temperature, TRow's ginseng 2For second exhaust reference temperature.
17. according to the electric expansion valve adjusting method described in claim 16, it is characterised in that the first exhaust is with reference to temperature
Spend TRow's ginseng 1For 75 DEG C, the second exhaust reference temperature TRow's ginseng 2For 95 DEG C.
18. according to the electric expansion valve adjusting method described in claim 17, it is characterised in that methods described also includes exhaust
Temperature controlling step：
As the delivery temperature TExhaustRise to first exhaust critical-temperature TRow faces 1When, the aperture locking of the electric expansion valve can only
Opening can not turn down greatly；
As the delivery temperature TExhaustDrop to second exhaust critical-temperature TRow faces 2When, electric expansion valve normal operation.
19. according to the electric expansion valve adjusting method described in claim 18, it is characterised in that the first exhaust stagnation temperature
Spend TRow faces 1For 105 DEG C, the second exhaust critical-temperature TRow faces 2Than the first exhaust critical-temperature TRow faces 1Low 5 DEG C.
20. according to the electric expansion valve adjusting method described in claim 18 or 19, it is characterised in that the delivery temperature control
Make further comprising the steps of：
As the delivery temperature TExhaustMore than the 3rd exhaust critical-temperature TRow faces 3When, the setting time t6 of electric expansion valve the 6th is strong
System is opened greatly, and amplification is insurance opening value KInsurance；
As the delivery temperature TExhaustDrop to the first exhaust critical-temperature TRow faces 1When low, the electric expansion valve is normally transported
OK.
21. according to the electric expansion valve adjusting method described in claim 20, it is characterised in that the 6th setting time t6
For 30 seconds, the insurance opening value KInsurance=δ * (TExhaust-TRow faces 1), wherein insurance aperture coefficient δ meets 1≤δ≤6.
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