CN105157292A - Control method and device for electronic expansion valves of air cooling screw unit - Google Patents
Control method and device for electronic expansion valves of air cooling screw unit Download PDFInfo
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- CN105157292A CN105157292A CN201510390167.8A CN201510390167A CN105157292A CN 105157292 A CN105157292 A CN 105157292A CN 201510390167 A CN201510390167 A CN 201510390167A CN 105157292 A CN105157292 A CN 105157292A
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Abstract
The invention discloses a control method and device for electronic expansion valves of an air cooling screw unit. The air cooling screw unit comprises a compressor, the multiple electronic expansion valves, a plurality of four-way valves and a plurality of fin heat exchangers, and each fin heat exchanger is equipped with one electronic expansion valve and one four-way valve. The control method comprises the steps that a current air suction superheat degree of the air cooling screw unit is obtained every other preset time, and a deviation between the current air suction superheat degree and a preset air suction superheat degree is obtained; a change rate of air suction superheat degrees within a preset time is obtained; and the opening degree of the multiple electronic expansion valves is controlled according to the deviation of the air suction superheat degree, the change rate of air suction superheat degrees and a first preset control table. The flow rate and flow direction of coolants can be accurately controlled through the method, and the operation efficiency of the unit is improved. In addition, each fin heat exchanger can defrost independently through composite control of the corresponding electronic expansion valve and the corresponding four-way valve, and continuous heating of the unit is achieved, so that the user experience is improved.
Description
Technical field
The present invention relates to air-conditioner technical field, particularly relate to a kind of control method for electronic expansion valve and control device of air-cooled screw unit.
Background technology
At present, cold medium flux in major part air-cooled screw unit mainly relies on orifice plate or electric expansion valve to control, and be all that unified throttling is then uncontrolled flows in all condensation streams, may cause like this cold medium flux and traffic organising inaccurate, reduce unit efficiency.In addition, air-cooled screw unit, when defrosting, must control cross valve commutation, but the Air-Cooled Heat Pump Unit in air-conditioner now can be caused can not to continue heat supply to user side, cause poor user experience.
Summary of the invention
Object of the present invention is intended to solve one of above-mentioned technical problem at least to a certain extent.
For this reason, first object of the present invention is the control method for electronic expansion valve proposing a kind of air-cooled screw unit.The method is by gathering the suction superheat rate of change calculated in suction superheat deviation and certain hour, two dimension matching, calculate electronic expansion valve controls step number, can accurately control cold medium flux and the flow direction, improve the operational efficiency of unit, and controlled by each electric expansion valve and cross valve combination, reaching each finned heat exchanger can defrost separately, achieve the continuously heating of unit, thus improve Consumer's Experience.
Second object of the present invention is the control device for electronic expansion valve proposing a kind of air-cooled screw unit.
To achieve these goals, the control method for electronic expansion valve of the air-cooled screw unit of first aspect present invention embodiment, described air-cooled screw unit comprises compressor, multiple electric expansion valve, multiple cross valve, multiple finned heat exchanger, and each finned heat exchanger configures an electric expansion valve and cross valve, described method comprises: S1, obtain the current suction superheat of described air-cooled screw unit every Preset Time, and obtain the deviation of suction superheat according to described current suction superheat and default suction superheat; S2, obtains the suction superheat rate of change in described Preset Time; And S3, the aperture of described multiple electric expansion valve is controlled according to the deviation of described suction superheat, described suction superheat rate of change and the first default control table.
According to the control method for electronic expansion valve of the air-cooled screw unit of the embodiment of the present invention, the current suction superheat of air-cooled screw unit is obtained every Preset Time, and the deviation of suction superheat is obtained according to current suction superheat and default suction superheat, and the suction superheat rate of change obtained in Preset Time, and according to the deviation of suction superheat, suction superheat rate of change and the first default control table control the aperture of multiple electric expansion valve, namely by gathering the suction superheat rate of change calculated in suction superheat deviation and certain hour, two dimension matching, calculate electronic expansion valve controls step number, can accurately control cold medium flux and the flow direction, improve the operational efficiency of unit, and controlled by each electric expansion valve and cross valve combination, reach each finned heat exchanger can defrost separately, achieve the continuously heating of unit, thus improve Consumer's Experience.
According to one embodiment of present invention, described first default control table comprises the control step number of the deviation of multiple sample suction superheat, multiple sample suction superheat rate of change and described multiple electric expansion valve, wherein, the deviation of described control step number and often pair of sample suction superheat and sample suction superheat rate of change have corresponding relation.
According to one embodiment of present invention, the aperture of described multiple electric expansion valve is controlled according to the deviation of described suction superheat, described suction superheat rate of change and the first default control table, specifically comprise: search described first default control table according to the deviation of described suction superheat, described suction superheat rate of change, obtain the control step number of corresponding multiple electric expansion valves; The aperture of described multiple electric expansion valve is regulated according to described control step number.
According to one embodiment of present invention, described control method also comprises: when detecting at least one finned heat exchanger in described multiple finned heat exchanger and entering defrost state, closes electric expansion valve corresponding at least one finned heat exchanger described and cross valve; When detecting at least one finned heat exchanger described and exiting described defrost state, control electric expansion valve corresponding at least one finned heat exchanger described and preset opening value every described Preset Time unlatching; Judge whether the master control time of the electric expansion valve that at least one finned heat exchanger described is corresponding is more than or equal to very first time threshold value, or, judge the current suction superheat of described air-cooled screw unit whether be more than or equal to described default suction superheat and preset value and; If the master control time of the electric expansion valve that at least one finned heat exchanger described is corresponding is more than or equal to described very first time threshold value, or, the current suction superheat of described air-cooled screw unit be more than or equal to described default suction superheat and preset value and, then repeat described step S1-S3.
According to one embodiment of present invention, described control method also comprises: the current pressure values obtaining described air-cooled screw unit, and judges whether described current pressure values is greater than the first pressure threshold; If described current pressure values is greater than described first pressure threshold, then judge whether further to meet the hypertonia protective condition preset; If the hypertonia protective condition run into described in meeting, then judge whether described current pressure values is less than the second pressure threshold further, wherein, described second pressure threshold is greater than described first pressure threshold; If described current pressure values is less than described second pressure threshold, then according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when described control step number is less than 0, the aperture of described electric expansion valve is regulated according to described control step number, and when described control step number is more than or equal to 0, maintain the aperture of described electric expansion valve; If described current pressure values is more than or equal to described second pressure threshold, then according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when described control step number is less than the first default step Numerical, the aperture of described electric expansion valve is regulated according to described control step number, and when described control step number is more than or equal to the described first default step Numerical, preset according to described first the aperture that step Numerical regulates described electric expansion valve.
According to one embodiment of present invention, described control method also comprises: when the suction superheat detecting described air-cooled screw unit is less than 0, maintain the aperture of described multiple electric expansion valve; When the suction superheat detecting described air-cooled screw unit is less than or equal to 0, then according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when described control step number is less than the second default step Numerical, the aperture of described electric expansion valve is regulated according to described control step number, and when described control step number is more than or equal to the described second default step Numerical, preset according to described second the aperture that step Numerical regulates described electric expansion valve.
According to one embodiment of present invention, described control method also comprises: the current exhaust degree of superheat obtaining described air-cooled screw unit every Preset Time, and obtains the deviation of discharge superheat according to the described current exhaust degree of superheat and default discharge superheat; Obtain the discharge superheat rate of change in described Preset Time; And the aperture of described multiple electric expansion valve is controlled according to the deviation of described discharge superheat, described discharge superheat rate of change and the second default control table.
To achieve these goals, the control device for electronic expansion valve of the air-cooled screw unit of second aspect present invention embodiment, described air-cooled screw unit comprises compressor, multiple electric expansion valve, multiple cross valve, multiple finned heat exchanger, and each finned heat exchanger configures an electric expansion valve and cross valve, described device comprises: the first acquisition module, for obtaining the current suction superheat of described air-cooled screw unit every Preset Time, and obtain the deviation of suction superheat according to described current suction superheat and default suction superheat; Second acquisition module, for obtaining the suction superheat rate of change in described Preset Time; And control module, the aperture of described multiple electric expansion valve is controlled for the deviation according to described suction superheat, described suction superheat rate of change and the first default control table.
According to the control device for electronic expansion valve of the air-cooled screw unit of the embodiment of the present invention, obtain the current suction superheat of air-cooled screw unit every Preset Time by the first acquisition module, and the deviation of suction superheat is obtained according to current suction superheat and default suction superheat, second acquisition module obtains the suction superheat rate of change in Preset Time, control module is according to the deviation of suction superheat, suction superheat rate of change and the first default control table control the aperture of multiple electric expansion valve, namely by gathering the suction superheat rate of change calculated in suction superheat deviation and certain hour, two dimension matching, calculate electronic expansion valve controls step number, can accurately control cold medium flux and the flow direction, improve the operational efficiency of unit, and controlled by each electric expansion valve and cross valve combination, reach each finned heat exchanger can defrost separately, achieve the continuously heating of unit, thus improve Consumer's Experience.
According to one embodiment of present invention, described first default control table comprises the control step number of the deviation of multiple sample suction superheat, multiple sample suction superheat rate of change and described multiple electric expansion valve, wherein, the deviation of described control step number and often pair of sample suction superheat and sample suction superheat rate of change have corresponding relation.
According to one embodiment of present invention, described control module specifically for: search described first default control table according to the deviation of described suction superheat, described suction superheat rate of change, obtain the control step number of corresponding multiple electric expansion valves; The aperture of described multiple electric expansion valve is regulated according to described control step number.
According to one embodiment of present invention, described control module also for: when detecting at least one finned heat exchanger in described multiple finned heat exchanger and entering defrost state, close electric expansion valve corresponding at least one finned heat exchanger described and cross valve; When detecting at least one finned heat exchanger described and exiting described defrost state, control electric expansion valve corresponding at least one finned heat exchanger described and open default opening value every described Preset Time, until the master control time of electric expansion valve corresponding at least one finned heat exchanger described is more than or equal to described very first time threshold value, or, the current suction superheat of described air-cooled screw unit be more than or equal to described default suction superheat and preset value and till.
According to one embodiment of present invention, described control device also comprises: the 3rd acquisition module, for obtaining the current pressure values of described air-cooled screw unit; First judge module, for judging whether described current pressure values is greater than the first pressure threshold; Second judge module, for when described first judge module judges that described current pressure values is greater than described first pressure threshold, judges whether to meet the hypertonia protective condition preset; 3rd judge module, for described second judge module judge meet described in run into hypertonia protective condition time, judge whether described current pressure values is less than the second pressure threshold, wherein, described second pressure threshold is greater than described first pressure threshold; Described control module is also for when described 3rd judge module judges that described current pressure values is less than described second pressure threshold, according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when described control step number is less than 0, the aperture of described electric expansion valve is regulated according to described control step number, and when described control step number is more than or equal to 0, maintain the aperture of described electric expansion valve; Described control module is also for when described 3rd judge module judges that described current pressure values is more than or equal to described second pressure threshold, according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when described control step number is less than the first default step Numerical, the aperture of described electric expansion valve is regulated according to described control step number, and when described control step number is more than or equal to the described first default step Numerical, preset according to described first the aperture that step Numerical regulates described electric expansion valve.
According to one embodiment of present invention, described control module also for: when detecting the suction superheat of described air-cooled screw unit and being less than 0, maintain the aperture of described multiple electric expansion valve; When the suction superheat detecting described air-cooled screw unit is less than or equal to 0, then according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when described control step number is less than the second default step Numerical, the aperture of described electric expansion valve is regulated according to described control step number, and when described control step number is more than or equal to the described second default step Numerical, preset according to described second the aperture that step Numerical regulates described electric expansion valve.
According to one embodiment of present invention, described first acquisition module also for obtaining the current exhaust degree of superheat of described air-cooled screw unit every Preset Time, and obtains the deviation of discharge superheat according to the described current exhaust degree of superheat and default discharge superheat; Described second acquisition module is also for obtaining the discharge superheat rate of change in described Preset Time; Described control module also controls the aperture of described multiple electric expansion valve for the deviation according to described discharge superheat, described discharge superheat rate of change and the second default control table.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein,
Fig. 1 is the flow chart of the control method for electronic expansion valve of air-cooled screw unit according to an embodiment of the invention;
Fig. 2 is the flow chart of MOP control procedure according to an embodiment of the invention;
Fig. 3 is the structured flowchart of the control device for electronic expansion valve of air-cooled screw unit according to an embodiment of the invention; And
Fig. 4 is the structured flowchart of the control device for electronic expansion valve of air-cooled screw unit according to another embodiment of the present invention.
Reference numeral:
First acquisition module 10, second acquisition module 20, control module 30, the 3rd acquisition module 40, first judge module 50, second judge module 60 and the 3rd judge module 70.
Detailed description of the invention
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
Below with reference to the accompanying drawings control method for electronic expansion valve and the control device of the air-cooled screw unit of the embodiment of the present invention are described.
Fig. 1 is the flow chart of the control method for electronic expansion valve of air-cooled screw unit according to an embodiment of the invention.It should be noted that, in an embodiment of the present invention, air-cooled screw unit can comprise compressor, multiple electric expansion valve, multiple cross valve, multiple finned heat exchanger, and each finned heat exchanger configures an electric expansion valve and cross valve.Wherein, in describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
As shown in Figure 1, the control method for electronic expansion valve of this air-cooled screw unit can comprise:
S101, obtains the current suction superheat of air-cooled screw unit every Preset Time, and obtains the deviation of suction superheat according to current suction superheat and default suction superheat.
Particularly, can the suction temperature of Real-time Collection air-cooled screw unit, pressure of inspiration(Pi) and described pressure of inspiration(Pi) time saturation temperature etc., and regularly can calculate according to the above-mentioned data collected every Preset Time, calculate the current suction superheat of air-cooled screw unit, and calculate the difference between it according to current suction superheat and default suction superheat, using the deviation ERssh of this difference as suction superheat.That is, can Preset Time be one-period, regularly can obtain the deviation of suction superheat.
S102, obtains the suction superheat rate of change in Preset Time.
Particularly, when obtaining the deviation of suction superheat, also can calculate the suction superheat rate of change DRssh in this Preset Time according to the suction superheat gathered in Preset Time and Preset Time.
S103, controls the aperture of multiple electric expansion valve according to the deviation of suction superheat, suction superheat rate of change and the first default control table.
Wherein, in an embodiment of the present invention, the first default control table can be and presets, first default control table can comprise the control step number of the deviation of multiple sample suction superheat, multiple sample suction superheat rate of change and multiple electric expansion valve, wherein, the deviation and the sample suction superheat rate of change that control step number and often pair of sample suction superheat have corresponding relation.Be appreciated that, in an embodiment of the present invention, the first default control table is set up: (as 1 minute) gathers the data such as suction temperature, pressure of inspiration(Pi) of air-cooled screw unit to calculate multiple suction superheat by regular intervals by following steps, and calculate suction superheat deviation per minute according to this suction superheat and default suction superheat, and using the deviation of these deviations as multiple sample suction superheat; And suction superheat rate of change per minute can be calculated according to the above-mentioned data such as suction temperature, pressure of inspiration(Pi) collected, and using these rates of change as multiple sample suction superheat rate of change; Then, two-dimensional matrix table is listed with the deviation of multiple sample suction superheat and multiple sample suction superheat rate of change, as tieed up as second of matrix table using the deviation of suction superheat as first of matrix table the dimension, sample suction superheat rate of change, the first dimension ties up with second the control step number that crossing point is set to electric expansion valve.Be appreciated that controlling step number is the empirical value obtained according to great many of experiments.
Specifically, in an embodiment of the present invention, the specific implementation process controlling the aperture of multiple electric expansion valve according to the deviation of suction superheat, suction superheat rate of change and the first default control table can be as follows: search the first default control table according to the deviation of suction superheat, suction superheat rate of change, obtain the control step number of corresponding multiple electric expansion valves; The aperture of multiple electric expansion valve is regulated according to control step number.More specifically, can by the deviation of suction superheat, the deviation of the sample suction superheat in suction superheat rate of change and the first default control table, sample suction superheat rate of change compares, find the deviation with suction superheat, the deviation of the sample suction superheat that suction superheat rate of change size is corresponding, sample suction superheat rate of change, afterwards can according to the deviation of sample suction superheat, sample suction superheat rate of change finds the control step number of the electric expansion valve of its correspondence, and control the stepper motor of electric expansion valve to regulate the aperture of electric expansion valve according to this control step number.Wherein, be appreciated that if controlling step number is just, then represent the aperture by increasing electric expansion valve; If it is negative for controlling step number, then represent the aperture by reducing electric expansion valve.
Thus, an electric expansion valve and cross valve is configured by giving each finned heat exchanger, and by each control cycle (namely above-mentioned Preset Time), the deviation of current suction superheat and suction superheat rate of change and the first default control table are compared, to obtain the control step number of current each electric expansion valve, the aperture of each electric expansion valve can be controlled afterwards according to this control step number, accurately can control cold medium flux and the flow direction in unit, improve the operational efficiency of unit.
It should be noted that, controlling in the process of the aperture of electric expansion valve every Preset Time according to the deviation of suction superheat, suction superheat rate of change, when there is the boundary conditions such as finned heat exchanger defrosts, too high, the current degree of superheat of current pressure values is too low, also need to carry out different adjustments according to different boundary conditions to electric expansion valve, description will be introduced one by one below.
1) defrost protecting control:
When needing defrosting for certain finned heat exchanger, the logic control of defrost phase can be entered, particularly, in one embodiment of the invention, the control method for electronic expansion valve of this air-cooled screw unit also can comprise: when detecting at least one finned heat exchanger in multiple finned heat exchanger and entering defrost state, close electric expansion valve corresponding at least one finned heat exchanger and cross valve; When detecting at least one finned heat exchanger and exiting defrost state, control electric expansion valve corresponding at least one finned heat exchanger and open default opening value every Preset Time; Judge whether the master control time of the electric expansion valve that at least one finned heat exchanger is corresponding is more than or equal to very first time threshold value, or, judge the current suction superheat of air-cooled screw unit whether be more than or equal to default suction superheat and preset value and; If the master control time of the electric expansion valve that at least one finned heat exchanger is corresponding is more than or equal to very first time threshold value, or, the current suction superheat of air-cooled screw unit be more than or equal to default suction superheat and preset value and, then repeated execution of steps S101-S103.
More specifically, when needing to defrost for some fins, when this finned heat exchanger enters defrost state, electric expansion valve corresponding to this finned heat exchanger and cross valve can be closed.When finned heat exchanger exits defrost state, at special time Tdefout (wherein, special time is more than or equal to Preset Time) in, control corresponding electric expansion valve every Preset Time and open certain step number Mdefout (namely above-mentioned default opening value), until after the special time Tdefout time or meet current suction superheat be more than or equal to default suction superheat and preset value (as 2 degree) and, can control according to normal logic, the aperture of electric expansion valve can be controlled according to the above-mentioned deviation according to suction superheat and suction superheat rate of change.
2) MOP controls (i.e. hypertonia protecting control):
It should be noted that, this MOP controls after compressor operating effectively, and just need to carry out MOP control when cross valve switches rear completely certain hour (as 2 minutes) and air-cooled screw unit is in non-defrost state.Particularly, in one embodiment of the invention, as shown in Figure 2, the control method for electronic expansion valve of this air-cooled screw unit also can comprise MOP control procedure, particularly, this MOP control procedure can comprise: the current pressure values obtaining air-cooled screw unit, and judges whether current pressure values is greater than the first pressure threshold (S201); If current pressure values is greater than the first pressure threshold, then judge whether further to meet the hypertonia protective condition (S202) preset; If meet the hypertonia protective condition run into, then judge whether current pressure values is less than the second pressure threshold (S203) further, wherein, the second pressure threshold is greater than the first pressure threshold; If current pressure values is less than the second pressure threshold, then according to the deviation of current suction superheat and the control step number (S204) of current suction superheat rate of change acquisition electric expansion valve, and when controlling step number and being less than 0, according to the aperture (S205) controlling step number adjustment electric expansion valve, and when controlling step number and being more than or equal to 0, maintain the aperture (S206) of electric expansion valve; If current pressure values is more than or equal to the second pressure threshold, then according to the deviation of current suction superheat and the control step number (S207) of current suction superheat rate of change acquisition electric expansion valve, and when controlling step number and being less than the first default step Numerical, according to the aperture (S208) controlling step number adjustment electric expansion valve, and when controlling step number and being more than or equal to the first default step Numerical, preset according to first the aperture (S209) that step Numerical regulates electric expansion valve.
Wherein, in an embodiment of the present invention, meet the hypertonia protective condition preset to comprise: compressor runs, cross valve has reached certain hour (as 2 minutes) after switching and unit is in non-defrost state etc.
More specifically, the current pressure values Pe of air-cooled screw unit can be obtained, and when Pe > MOP-Pcr (the first namely above-mentioned pressure threshold), judge currently whether meet the above-mentioned hypertonia protective condition preset, if not, then do not enter MOP to control, otherwise need to judge whether current pressure values Pe is less than MOP (the second namely above-mentioned pressure threshold) further, if MOP > Pe > is MOP-Pcr, from the first default control table, the control step number M of electric expansion valve is then obtained according to the deviation of current suction superheat and current suction superheat rate of change, and when controlling step number M and being less than 0, the aperture of electric expansion valve is regulated according to this control step number M, if control step number M to be more than or equal to 0, then maintain the aperture of electric expansion valve, namely the aperture by reducing electric expansion valve when current pressure values is too high reduces current pressure.As Pe >=MOP, the control step number M of electric expansion valve can be obtained from the first default control table according to the deviation of current suction superheat and current suction superheat rate of change, and be less than Mmop (the first namely above-mentioned default step Numerical at control step number M, as-15) time, the aperture of electric expansion valve is regulated according to this Mmop, if control step number M >=Mmop, then regulate the aperture of electric expansion valve according to Mmop.Thus, control to make the current pressure values of unit control in normal range (NR), to ensure the normal operation of compressor by MOP.
Be appreciated that if current pressure values Pe≤MOP-Pcr, then can control according to normal control logic, namely control the aperture of electric expansion valve according to the deviation of suction superheat, suction superheat rate of change and the first default control table.
3) low overheat protecting control:
In order to ensure the normal operation of air-cooled screw unit, when there is the too low situation of suction superheat, the aperture of electric expansion valve is controlled by different process, optionally, in one embodiment of the invention, the control method for electronic expansion valve of this air-cooled screw unit also can comprise: when the suction superheat detecting air-cooled screw unit is less than 0, maintain the aperture of multiple electric expansion valve; When the suction superheat detecting air-cooled screw unit is less than or equal to 0, then according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when controlling step number and being less than the second default step Numerical, according to the aperture controlling step number adjustment electric expansion valve, and when controlling step number and being more than or equal to the second default step Numerical, preset according to second the aperture that step Numerical regulates electric expansion valve.
Particularly, in the running of air-cooled screw unit, when suction superheat is less than 0, the aperture that can control electric expansion valve remains unchanged; When suction superheat is less than or equal to 0, the control step number of electric expansion valve can be obtained from the first default control table according to the deviation of current suction superheat and current suction superheat rate of change, and when this control step number is less than the second default step Numerical, the aperture of electric expansion valve can be regulated according to this control step number, if this control step number is more than or equal to second preset step Numerical, then regulate the aperture of electric expansion valve according to this second default step Numerical.
Optionally, in one embodiment of the invention, the control method for electronic expansion valve of this air-cooled screw unit also can comprise: the current exhaust degree of superheat obtaining air-cooled screw unit every Preset Time, and obtains the deviation of discharge superheat according to the current exhaust degree of superheat and default discharge superheat; Obtain the discharge superheat rate of change in Preset Time; And the aperture of multiple electric expansion valve is controlled according to the deviation of discharge superheat, discharge superheat rate of change and the second default control table.Be appreciated that, in the running of air-cooled screw unit, also can calculate deviation and the current exhaust degree of superheat rate of change of the current exhaust degree of superheat, and from the second default control table, the control step number of electric expansion valve is obtained according to the deviation of this current exhaust degree of superheat and current exhaust degree of superheat rate of change, the aperture of electric expansion valve can be regulated afterwards according to this control step number.It should be noted that, in the running of air-cooled screw unit, the process of suction superheat has precedence over the process of discharge superheat.
According to the control method for electronic expansion valve of the air-cooled screw unit of the embodiment of the present invention, the current suction superheat of air-cooled screw unit is obtained every Preset Time, and the deviation of suction superheat is obtained according to current suction superheat and default suction superheat, and the suction superheat rate of change obtained in Preset Time, and according to the deviation of suction superheat, suction superheat rate of change and the first default control table control the aperture of multiple electric expansion valve, namely by gathering the suction superheat rate of change calculated in suction superheat deviation and certain hour, two dimension matching, calculate electronic expansion valve controls step number, can accurately control cold medium flux and the flow direction, improve the operational efficiency of unit, and controlled by each electric expansion valve and cross valve combination, reach each finned heat exchanger can defrost separately, achieve the continuously heating of unit, thus improve Consumer's Experience.
In order to realize above-described embodiment, the invention allows for a kind of control device for electronic expansion valve of air-cooled screw unit.
Fig. 3 is the structured flowchart of the control device for electronic expansion valve of air-cooled screw unit according to an embodiment of the invention.It should be noted that, in an embodiment of the present invention, air-cooled screw unit can comprise compressor, multiple electric expansion valve, multiple cross valve, multiple finned heat exchanger, and each finned heat exchanger configures an electric expansion valve and cross valve.
As shown in Figure 3, the control device for electronic expansion valve of this air-cooled screw unit can comprise: the first acquisition module 10, second acquisition module 20 and control module 30.
Particularly, the first acquisition module 10 can be used for the current suction superheat obtaining air-cooled screw unit every Preset Time, and obtains the deviation of suction superheat according to current suction superheat and default suction superheat.More specifically, first acquisition module 10 can the suction temperature of Real-time Collection air-cooled screw unit, pressure of inspiration(Pi) and described pressure of inspiration(Pi) time saturation temperature etc., and regularly can calculate according to the above-mentioned data collected every Preset Time, calculate the current suction superheat of air-cooled screw unit, and calculate the difference between it according to current suction superheat and default suction superheat, using the deviation ERssh of this difference as suction superheat.That is, can Preset Time be one-period, regularly can obtain the deviation of suction superheat.
Second acquisition module 20 can be used for obtaining the suction superheat rate of change in Preset Time.More specifically, the second acquisition module 20, when the first acquisition module 10 obtains the deviation of suction superheat, can calculate the suction superheat rate of change DRssh in this Preset Time according to the suction superheat gathered in Preset Time and Preset Time.
Control module 30 deviation, suction superheat rate of change and the first default control table that can be used for according to suction superheat controls the aperture of multiple electric expansion valve.Wherein, in an embodiment of the present invention, the first default control table can be and presets, first default control table can comprise the control step number of the deviation of multiple sample suction superheat, multiple sample suction superheat rate of change and multiple electric expansion valve, wherein, the deviation and the sample suction superheat rate of change that control step number and often pair of sample suction superheat have corresponding relation.Be appreciated that, in an embodiment of the present invention, by setting up the first default control table with under type: by regular intervals, (as 1 minute) gathers the data such as suction temperature, pressure of inspiration(Pi) of air-cooled screw unit to calculate multiple suction superheat, and calculate suction superheat deviation per minute according to this suction superheat and default suction superheat, and using the deviation of these deviations as multiple sample suction superheat; And suction superheat rate of change per minute can be calculated according to the above-mentioned data such as suction temperature, pressure of inspiration(Pi) collected, and using these rates of change as multiple sample suction superheat rate of change; Then, two-dimensional matrix table is listed with the deviation of multiple sample suction superheat and multiple sample suction superheat rate of change, as tieed up as second of matrix table using the deviation of suction superheat as first of matrix table the dimension, sample suction superheat rate of change, the first dimension ties up with second the control step number that crossing point is set to electric expansion valve.Be appreciated that controlling step number is the empirical value obtained according to great many of experiments.
Specifically, in an embodiment of the present invention, control module 30 controls the specific implementation process of the aperture of multiple electric expansion valve according to the deviation of suction superheat, suction superheat rate of change and the first default control table can be as follows: search the first default control table according to the deviation of suction superheat, suction superheat rate of change, obtain the control step number of corresponding multiple electric expansion valves; The aperture of multiple electric expansion valve is regulated according to control step number.
More specifically, control module 30 can by the deviation of suction superheat, the deviation of the sample suction superheat in suction superheat rate of change and the first default control table, sample suction superheat rate of change compares, find the deviation with suction superheat, the deviation of the sample suction superheat that suction superheat rate of change size is corresponding, sample suction superheat rate of change, afterwards can according to the deviation of sample suction superheat, sample suction superheat rate of change finds the control step number of the electric expansion valve of its correspondence, and control the stepper motor of electric expansion valve to regulate the aperture of electric expansion valve according to this control step number.Wherein, be appreciated that if controlling step number is just, then represent the aperture by increasing electric expansion valve; If it is negative for controlling step number, then represent the aperture by reducing electric expansion valve.
Thus, an electric expansion valve and cross valve is configured by giving each finned heat exchanger, and by each control cycle (namely above-mentioned Preset Time), the deviation of current suction superheat and suction superheat rate of change and the first default control table are compared, to obtain the control step number of current each electric expansion valve, the aperture of each electric expansion valve can be controlled afterwards according to this control step number, accurately can control cold medium flux and the flow direction in unit, improve the operational efficiency of unit.
It should be noted that, controlling in the process of the aperture of electric expansion valve every Preset Time according to the deviation of suction superheat, suction superheat rate of change, when there is the boundary conditions such as finned heat exchanger defrosts, too high, the current degree of superheat of current pressure values is too low, also need to carry out different adjustments according to different boundary conditions to electric expansion valve, description will be introduced one by one below.
When needing defrosting for certain finned heat exchanger, the logic control of defrost phase can be entered, particularly, in one embodiment of the invention, control module 30 also can be used for: when detecting at least one finned heat exchanger in multiple finned heat exchanger and entering defrost state, close electric expansion valve corresponding at least one finned heat exchanger and cross valve; When detecting at least one finned heat exchanger and exiting defrost state, control electric expansion valve corresponding at least one finned heat exchanger and open default opening value every Preset Time, until the master control time of electric expansion valve corresponding at least one finned heat exchanger is more than or equal to very first time threshold value, or, the current suction superheat of air-cooled screw unit be more than or equal to default suction superheat and preset value and till.
More specifically, when needing to defrost for some fins, when this finned heat exchanger enters defrost state, control module 30 can close electric expansion valve corresponding to this finned heat exchanger and cross valve.When finned heat exchanger exits defrost state, at special time Tdefout (wherein, special time is more than or equal to Preset Time) in, control module 30 can control corresponding electric expansion valve every Preset Time and open certain step number Mdefout (namely above-mentioned default opening value), until after the special time Tdefout time or meet current suction superheat be more than or equal to default suction superheat and preset value (as 2 degree) and, can control according to normal logic, the aperture of electric expansion valve can be controlled according to the above-mentioned deviation according to suction superheat and suction superheat rate of change.
It should be noted that, in the running of unit, also can carry out MOP control, this MOP controls after compressor operating effectively, and just need to carry out MOP control when cross valve switches rear completely certain hour (as 2 minutes) and air-cooled screw unit is in non-defrost state.Particularly, in one embodiment of the invention, as shown in Figure 4, the control device for electronic expansion valve of this air-cooled screw unit also can comprise: the 3rd acquisition module 40, first judge module 50, second judge module 60 and the 3rd judge module 70.
Particularly, the 3rd acquisition module 40 can be used for the current pressure values obtaining air-cooled screw unit.First judge module 50 can be used for judging whether current pressure values is greater than the first pressure threshold.Second judge module 60 is used in the first judge module 50 when judging that current pressure values is greater than the first pressure threshold, judges whether to meet the hypertonia protective condition preset.3rd judge module 70 be used in second judge module 60 judge meet run into hypertonia protective condition time, judge whether current pressure values is less than the second pressure threshold, wherein, the second pressure threshold is greater than the first pressure threshold.Wherein, in an embodiment of the present invention, meet the hypertonia protective condition preset to comprise: compressor runs, cross valve has reached certain hour (as 2 minutes) after switching and unit is in non-defrost state etc.
In an embodiment of the present invention, control module 30 is also used in the 3rd judge module 70 when judging that current pressure values is less than the second pressure threshold, according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when controlling step number and being less than 0, according to the aperture controlling step number adjustment electric expansion valve, and when controlling step number and being more than or equal to 0, maintain the aperture of electric expansion valve.
In an embodiment of the present invention, control module 30 is also used in the 3rd judge module 70 when judging that current pressure values is more than or equal to the second pressure threshold, according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when controlling step number and being less than the first default step Numerical, according to the aperture controlling step number adjustment electric expansion valve, and when controlling step number and being more than or equal to the first default step Numerical, preset according to first the aperture that step Numerical regulates electric expansion valve.
More specifically, 3rd acquisition module 40 can obtain the current pressure values Pe of air-cooled screw unit, and when the first judge module 50 judges Pe > MOP-Pcr (the first namely above-mentioned pressure threshold), second judge module 60 judges currently whether meet the above-mentioned hypertonia protective condition preset, if not, then do not enter MOP to control, otherwise the 3rd judge module 70 judges whether current pressure values Pe is less than MOP (the second namely above-mentioned pressure threshold), if MOP > Pe > is MOP-Pcr, control module 30 deviations according to current suction superheat and current suction superheat rate of change obtain the control step number M of electric expansion valve from the first default control table, and when controlling step number M and being less than 0, the aperture of electric expansion valve is regulated according to this control step number M, if control step number M to be more than or equal to 0, then maintain the aperture of electric expansion valve, namely the aperture by reducing electric expansion valve when current pressure values is too high reduces current pressure.As Pe >=MOP, control module 30 can obtain the control step number M of electric expansion valve from the first default control table according to the deviation of current suction superheat and current suction superheat rate of change, and be less than Mmop (the first namely above-mentioned default step Numerical at control step number M, as-15) time, the aperture of electric expansion valve is regulated according to this Mmop, if control step number M >=Mmop, then regulate the aperture of electric expansion valve according to Mmop.Thus, control to make the current pressure values of unit control in normal range (NR), to ensure the normal operation of compressor by MOP.
Be appreciated that if current pressure values Pe≤MOP-Pcr, then can control according to normal control logic, namely control the aperture of electric expansion valve according to the deviation of suction superheat, suction superheat rate of change and the first default control table.
In order to ensure the normal operation of air-cooled screw unit, when there is the too low situation of suction superheat, the aperture of electric expansion valve is controlled by different process, optionally, in one embodiment of the invention, control module 30 also can be used for: when the suction superheat detecting air-cooled screw unit is less than 0, maintain the aperture of multiple electric expansion valve; When the suction superheat detecting air-cooled screw unit is less than or equal to 0, then according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when controlling step number and being less than the second default step Numerical, according to the aperture controlling step number adjustment electric expansion valve, and when controlling step number and being more than or equal to the second default step Numerical, preset according to second the aperture that step Numerical regulates electric expansion valve.
Particularly, in the running of air-cooled screw unit, when suction superheat is less than 0, the aperture that control module 30 can control electric expansion valve remains unchanged; When suction superheat is less than or equal to 0, control module 30 can obtain the control step number of electric expansion valve from the first default control table according to the deviation of current suction superheat and current suction superheat rate of change, and when this control step number is less than the second default step Numerical, the aperture of electric expansion valve can be regulated according to this control step number, if this control step number is more than or equal to second preset step Numerical, then regulate the aperture of electric expansion valve according to this second default step Numerical.
Further, in one embodiment of the invention, the first acquisition module 10 also can be used for the current exhaust degree of superheat obtaining air-cooled screw unit every Preset Time, and obtains the deviation of discharge superheat according to the current exhaust degree of superheat and default discharge superheat.Second acquisition module 20 also can be used for obtaining the discharge superheat rate of change in Preset Time.Control module 30 deviation, discharge superheat rate of change and the second default control table that also can be used for according to discharge superheat controls the aperture of multiple electric expansion valve.Be appreciated that, in the running of air-cooled screw unit, also can calculate deviation and the current exhaust degree of superheat rate of change of the current exhaust degree of superheat, and from the second default control table, the control step number of electric expansion valve is obtained according to the deviation of this current exhaust degree of superheat and current exhaust degree of superheat rate of change, the aperture of electric expansion valve can be regulated afterwards according to this control step number.It should be noted that, in the running of air-cooled screw unit, the process of suction superheat has precedence over the process of discharge superheat.
According to the control device for electronic expansion valve of the air-cooled screw unit of the embodiment of the present invention, obtain the current suction superheat of air-cooled screw unit every Preset Time by the first acquisition module, and the deviation of suction superheat is obtained according to current suction superheat and default suction superheat, second acquisition module obtains the suction superheat rate of change in Preset Time, control module is according to the deviation of suction superheat, suction superheat rate of change and the first default control table control the aperture of multiple electric expansion valve, namely by gathering the suction superheat rate of change calculated in suction superheat deviation and certain hour, two dimension matching, calculate electronic expansion valve controls step number, can accurately control cold medium flux and the flow direction, improve the operational efficiency of unit, and controlled by each electric expansion valve and cross valve combination, reach each finned heat exchanger can defrost separately, achieve the continuously heating of unit, thus improve Consumer's Experience.
In describing the invention, it is to be appreciated that term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or the implicit quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the description of this description, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this description or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Describe and can be understood in flow chart or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of processor or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this description, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random access memory (RAM), read-only storage (ROM), erasablely edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk read-only storage (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanner to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, be then stored in computer storage.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: the discrete logic with the logic gates for realizing logic function to data-signal, there is the special IC of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned can be read-only storage, disk or CD etc.Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (14)
1. the control method for electronic expansion valve of an air-cooled screw unit, it is characterized in that, described air-cooled screw unit comprises compressor, multiple electric expansion valve, multiple cross valve, multiple finned heat exchanger, and each finned heat exchanger configures an electric expansion valve and cross valve, and described method comprises:
S1, obtains the current suction superheat of described air-cooled screw unit every Preset Time, and obtains the deviation of suction superheat according to described current suction superheat and default suction superheat;
S2, obtains the suction superheat rate of change in described Preset Time; And
S3, controls the aperture of described multiple electric expansion valve according to the deviation of described suction superheat, described suction superheat rate of change and the first default control table.
2. the method for claim 1, it is characterized in that, described first default control table comprises the control step number of the deviation of multiple sample suction superheat, multiple sample suction superheat rate of change and described multiple electric expansion valve, wherein, the deviation of described control step number and often pair of sample suction superheat and sample suction superheat rate of change have corresponding relation.
3. method as claimed in claim 2, is characterized in that, controls the aperture of described multiple electric expansion valve, specifically comprise according to the deviation of described suction superheat, described suction superheat rate of change and the first default control table:
Search described first default control table according to the deviation of described suction superheat, described suction superheat rate of change, obtain the control step number of corresponding multiple electric expansion valves;
The aperture of described multiple electric expansion valve is regulated according to described control step number.
4. the method according to any one of claim 1-3, is characterized in that, also comprises:
When detecting at least one finned heat exchanger in described multiple finned heat exchanger and entering defrost state, close electric expansion valve corresponding at least one finned heat exchanger described and cross valve;
When detecting at least one finned heat exchanger described and exiting described defrost state, control electric expansion valve corresponding at least one finned heat exchanger described and preset opening value every described Preset Time unlatching;
Judge whether the master control time of the electric expansion valve that at least one finned heat exchanger described is corresponding is more than or equal to very first time threshold value, or, judge the current suction superheat of described air-cooled screw unit whether be more than or equal to described default suction superheat and preset value and;
If the master control time of the electric expansion valve that at least one finned heat exchanger described is corresponding is more than or equal to described very first time threshold value, or, the current suction superheat of described air-cooled screw unit be more than or equal to described default suction superheat and preset value and, then repeat described step S1-S3.
5. the method according to any one of claim 1-3, is characterized in that, also comprises:
Obtain the current pressure values of described air-cooled screw unit, and judge whether described current pressure values is greater than the first pressure threshold;
If described current pressure values is greater than described first pressure threshold, then judge whether further to meet the hypertonia protective condition preset;
If the hypertonia protective condition run into described in meeting, then judge whether described current pressure values is less than the second pressure threshold further, wherein, described second pressure threshold is greater than described first pressure threshold;
If described current pressure values is less than described second pressure threshold, then according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when described control step number is less than 0, the aperture of described electric expansion valve is regulated according to described control step number, and when described control step number is more than or equal to 0, maintain the aperture of described electric expansion valve;
If described current pressure values is more than or equal to described second pressure threshold, then according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when described control step number is less than the first default step Numerical, the aperture of described electric expansion valve is regulated according to described control step number, and when described control step number is more than or equal to the described first default step Numerical, preset according to described first the aperture that step Numerical regulates described electric expansion valve.
6. the method according to any one of claim 1-3, is characterized in that, also comprises:
When the suction superheat detecting described air-cooled screw unit is less than 0, maintain the aperture of described multiple electric expansion valve;
When the suction superheat detecting described air-cooled screw unit is less than or equal to 0, then according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when described control step number is less than the second default step Numerical, the aperture of described electric expansion valve is regulated according to described control step number, and when described control step number is more than or equal to the described second default step Numerical, preset according to described second the aperture that step Numerical regulates described electric expansion valve.
7. the method for claim 1, is characterized in that, also comprises:
Obtain the current exhaust degree of superheat of described air-cooled screw unit every Preset Time, and obtain the deviation of discharge superheat according to the described current exhaust degree of superheat and default discharge superheat;
Obtain the discharge superheat rate of change in described Preset Time; And
The aperture of described multiple electric expansion valve is controlled according to the deviation of described discharge superheat, described discharge superheat rate of change and the second default control table.
8. the control device for electronic expansion valve of an air-cooled screw unit, it is characterized in that, described air-cooled screw unit comprises compressor, multiple electric expansion valve, multiple cross valve, multiple finned heat exchanger, and each finned heat exchanger configures an electric expansion valve and cross valve, and described device comprises:
First acquisition module, for obtaining the current suction superheat of described air-cooled screw unit every Preset Time, and obtains the deviation of suction superheat according to described current suction superheat and default suction superheat;
Second acquisition module, for obtaining the suction superheat rate of change in described Preset Time; And
Control module, controls the aperture of described multiple electric expansion valve for the deviation according to described suction superheat, described suction superheat rate of change and the first default control table.
9. device as claimed in claim 8, it is characterized in that, described first default control table comprises the control step number of the deviation of multiple sample suction superheat, multiple sample suction superheat rate of change and described multiple electric expansion valve, wherein, the deviation of described control step number and often pair of sample suction superheat and sample suction superheat rate of change have corresponding relation.
10. device as claimed in claim 9, is characterized in that, described control module specifically for:
Search described first default control table according to the deviation of described suction superheat, described suction superheat rate of change, obtain the control step number of corresponding multiple electric expansion valves;
The aperture of described multiple electric expansion valve is regulated according to described control step number.
11. devices according to any one of claim 8-10, is characterized in that, described control module also for:
When detecting at least one finned heat exchanger in described multiple finned heat exchanger and entering defrost state, close electric expansion valve corresponding at least one finned heat exchanger described and cross valve;
When detecting at least one finned heat exchanger described and exiting described defrost state, control electric expansion valve corresponding at least one finned heat exchanger described and open default opening value every described Preset Time, until the master control time of electric expansion valve corresponding at least one finned heat exchanger described is more than or equal to described very first time threshold value, or, the current suction superheat of described air-cooled screw unit be more than or equal to described default suction superheat and preset value and till.
12. devices according to any one of claim 8-10, is characterized in that, also comprise:
3rd acquisition module, for obtaining the current pressure values of described air-cooled screw unit;
First judge module, for judging whether described current pressure values is greater than the first pressure threshold;
Second judge module, for when described first judge module judges that described current pressure values is greater than described first pressure threshold, judges whether to meet the hypertonia protective condition preset;
3rd judge module, for described second judge module judge meet described in run into hypertonia protective condition time, judge whether described current pressure values is less than the second pressure threshold, wherein, described second pressure threshold is greater than described first pressure threshold;
Described control module is also for when described 3rd judge module judges that described current pressure values is less than described second pressure threshold, according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when described control step number is less than 0, the aperture of described electric expansion valve is regulated according to described control step number, and when described control step number is more than or equal to 0, maintain the aperture of described electric expansion valve;
Described control module is also for when described 3rd judge module judges that described current pressure values is more than or equal to described second pressure threshold, according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when described control step number is less than the first default step Numerical, the aperture of described electric expansion valve is regulated according to described control step number, and when described control step number is more than or equal to the described first default step Numerical, preset according to described first the aperture that step Numerical regulates described electric expansion valve.
13. devices according to any one of claim 8-10, is characterized in that, described control module also for:
When the suction superheat detecting described air-cooled screw unit is less than 0, maintain the aperture of described multiple electric expansion valve;
When the suction superheat detecting described air-cooled screw unit is less than or equal to 0, then according to the deviation of current suction superheat and the control step number of current suction superheat rate of change acquisition electric expansion valve, and when described control step number is less than the second default step Numerical, the aperture of described electric expansion valve is regulated according to described control step number, and when described control step number is more than or equal to the described second default step Numerical, preset according to described second the aperture that step Numerical regulates described electric expansion valve.
14. devices as claimed in claim 8, is characterized in that,
Described first acquisition module also for obtaining the current exhaust degree of superheat of described air-cooled screw unit every Preset Time, and obtains the deviation of discharge superheat according to the described current exhaust degree of superheat and default discharge superheat;
Described second acquisition module is also for obtaining the discharge superheat rate of change in described Preset Time;
Described control module also controls the aperture of described multiple electric expansion valve for the deviation according to described discharge superheat, described discharge superheat rate of change and the second default control table.
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