CN105157292B - The control method for electronic expansion valve and device of air-cooled screw unit - Google Patents
The control method for electronic expansion valve and device of air-cooled screw unit Download PDFInfo
- Publication number
- CN105157292B CN105157292B CN201510390167.8A CN201510390167A CN105157292B CN 105157292 B CN105157292 B CN 105157292B CN 201510390167 A CN201510390167 A CN 201510390167A CN 105157292 B CN105157292 B CN 105157292B
- Authority
- CN
- China
- Prior art keywords
- suction superheat
- electric expansion
- expansion valve
- control
- default
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of control method for electronic expansion valve and device of air-cooled screw unit, air-cooled screw unit includes compressor, multiple electric expansion valves, multiple four-way valves, multiple finned heat exchangers, and each finned heat exchanger configures an electric expansion valve and four-way valve, wherein this method includes：The current suction superheat of air-cooled screw unit is obtained every preset time, and according to current suction superheat and the deviation of default suction superheat acquisition suction superheat；Obtain the suction superheat rate of change in preset time；And deviation, suction superheat rate of change and the first default control table according to suction superheat control the aperture of multiple electric expansion valves.This method can accurately control cold medium flux and flow direction, the operational efficiency of unit is improved, and is controlled by each electric expansion valve and four-way valve combination, reaches that each finned heat exchanger can individually defrost, the continuously heating of unit is realized, so as to improve Consumer's Experience.
Description
Technical field
The present invention relates to air conditioner technical field, more particularly to a kind of control method for electronic expansion valve of air-cooled screw unit
And control device.
Background technology
At present, the cold medium flux in most of air-cooled screw unit relies primarily on orifice plate or electric expansion valve to control,
And all it is that unified throttling is then uncontrolled to flow in all condensation streams, so may result in cold medium flux and flow direction
Control is inaccurate, reduces unit efficiency.In addition, air-cooled screw unit is in defrosting, it is necessary to control four-way valve to commutate, but now
The Air-Cooled Heat Pump Unit in air conditioner can be caused to continue heat supply to user side, cause poor user experience.
The content of the invention
The purpose of the present invention is intended at least solve one of above-mentioned technical problem to a certain extent.
Therefore, first purpose of the present invention is to propose a kind of control method for electronic expansion valve of air-cooled screw unit.
This method calculates suction superheat deviation and the suction superheat rate of change in certain time by gathering, two dimension fitting, calculates
Electronic expansion valve controls step number is obtained, cold medium flux and flow direction can be accurately controlled, the operational efficiency of unit is improved, and
And controlled by each electric expansion valve and four-way valve combination, reach that each finned heat exchanger can individually defrost, realize
The continuously heating of unit, so as to improve Consumer's Experience.
Second object of the present invention is to propose a kind of control device for electronic expansion valve of air-cooled screw unit.
To achieve these goals, the electronic expansion valve controls side of the air-cooled screw unit of first aspect present invention embodiment
Method, the air-cooled screw unit includes compressor, multiple electric expansion valves, multiple four-way valves, multiple finned heat exchangers, and each
Finned heat exchanger configures an electric expansion valve and four-way valve, and methods described includes：S1, obtains described air-cooled every preset time
The current suction superheat of Screw chiller, and suction superheat is obtained according to the current suction superheat and default suction superheat
The deviation of degree；S2, obtains the suction superheat rate of change in the preset time；And S3, according to the suction superheat
Deviation, the suction superheat rate of change and the first default control table control the aperture of the multiple electric expansion valve.
The control method for electronic expansion valve of air-cooled screw unit according to embodiments of the present invention, wind is obtained every preset time
The current suction superheat of cold Screw chiller, and suction superheat is obtained according to current suction superheat and default suction superheat
Deviation, and obtain the suction superheat rate of change in preset time, and deviation, suction superheat according to suction superheat
Rate of change and the first default control table control the aperture of multiple electric expansion valves, i.e., by gather calculate suction superheat deviation and
Suction superheat rate of change in certain time, two dimension fitting, calculating obtains electronic expansion valve controls step number, can accurately controlled
Cold medium flux processed and flow direction, improve the operational efficiency of unit, and combine by each electric expansion valve and four-way valve
Control, reaches that each finned heat exchanger can individually defrost, realizes the continuously heating of unit, so as to improve user's body
Test.
According to one embodiment of present invention, the first default control table includes the inclined of multiple sample suction superheats
The control step number of poor, multiple sample suction superheat rates of change and the multiple electric expansion valve, wherein, the control step number
And the deviation and sample suction superheat rate of change of each pair sample suction superheat have corresponding relation.
According to one embodiment of present invention, according to the deviation of the suction superheat, the suction superheat rate of change
The aperture of the multiple electric expansion valve is controlled with the first default control table, is specifically included：According to the inclined of the suction superheat
Poor, described suction superheat rate of change searches the first default control table, obtains the control of corresponding multiple electric expansion valves
Step number；The aperture of the multiple electric expansion valve is adjusted according to the control step number.
According to one embodiment of present invention, the control method also includes：When in the multiple finned heat exchanger of detection
At least one finned heat exchanger when entering defrosting state, close the corresponding electric expansion valve of at least one finned heat exchanger
And four-way valve；When at least one described finned heat exchanger of detection exits the defrosting state, at least one described fin of control
The corresponding electric expansion valve of heat exchanger opens default opening value every the preset time；Judge at least one fin heat exchange
Whether the master control time of the corresponding electric expansion valve of device is more than or equal to very first time threshold value, or, judge the air-cooled spiral shell
The current suction superheat of bar unit whether be more than or equal to the default suction superheat and preset value and；If it is described extremely
The master control time of the corresponding electric expansion valve of a few finned heat exchanger is more than or equal to the very first time threshold value, or,
The current suction superheat of the air-cooled screw unit be more than or equal to the default suction superheat and preset value and, then weigh
The step S1-S3 is performed again.
According to one embodiment of present invention, the control method also includes：Obtain the current of the air-cooled screw unit
Pressure value, and judge whether the current pressure values are more than first pressure threshold value；If the current pressure values are more than described the
One pressure threshold, then further determine whether to meet default hypertonia protective condition；If the pressure run into described in meeting
Too high protective condition, then determine whether whether the current pressure values are less than second pressure threshold value, wherein, the second pressure
Threshold value is more than the first pressure threshold value；If the current pressure values are less than the second pressure threshold value, according to current
The deviation of suction superheat and current suction superheat rate of change obtain the control step number of electric expansion valve, and in the control
When step number is less than 0, adjust the aperture of the electric expansion valve according to the control step number, and be more than in the control step number or
During equal to 0, the aperture of the electric expansion valve is maintained；If the current pressure values are more than or equal to the second pressure threshold
Value, the then control for obtaining electric expansion valve according to the deviation of current suction superheat and current suction superheat rate of change is walked
Number, and when the control step number is less than the first default step Numerical, the electric expansion valve is adjusted according to the control step number
Aperture, and when the control step number is more than or equal to the described first default step Numerical, according to the described first default step Numerical
Adjust the aperture of the electric expansion valve.
According to one embodiment of present invention, the control method also includes：When the suction for detecting the air-cooled screw unit
When the gas degree of superheat is less than 0, the aperture of the multiple electric expansion valve is maintained；When the suction superheat for detecting the air-cooled screw unit
When degree is less than or equal to 0, then electronics is obtained according to the deviation of current suction superheat and current suction superheat rate of change
The control step number of expansion valve, and when the control step number is less than the second default step Numerical, according to the control step number regulation institute
The aperture of electric expansion valve is stated, and when the control step number is more than or equal to the described second default step Numerical, according to described
Second default step Numerical adjusts the aperture of the electric expansion valve.
According to one embodiment of present invention, the control method also includes：The air-cooled spiral shell is obtained every preset time
The current exhaust degree of superheat of bar unit, and discharge superheat is obtained according to the current exhaust degree of superheat and default discharge superheat
Deviation；Obtain the discharge superheat rate of change in the preset time；And it is deviation according to the discharge superheat, described
Discharge superheat rate of change and the second default control table control the aperture of the multiple electric expansion valve.
To achieve these goals, the electronic expansion valve controls dress of the air-cooled screw unit of second aspect of the present invention embodiment
Put, the air-cooled screw unit includes compressor, multiple electric expansion valves, multiple four-way valves, multiple finned heat exchangers, and each
Finned heat exchanger configures an electric expansion valve and four-way valve, and described device includes：First acquisition module, for when default
Between obtain the current suction superheat of the air-cooled screw unit, and according to the current suction superheat and default suction superheat
Degree obtains the deviation of suction superheat；Second acquisition module, for obtaining the suction superheat rate of change in the preset time；
And control module, for the deviation according to the suction superheat, the suction superheat rate of change and the first default control
Table controls the aperture of the multiple electric expansion valve.
The control device for electronic expansion valve of air-cooled screw unit according to embodiments of the present invention, can pass through the first acquisition module
The current suction superheat of air-cooled screw unit is obtained every preset time, and according to current suction superheat and default air-breathing mistake
Temperature obtains the deviation of suction superheat, and the second acquisition module obtains the suction superheat rate of change in preset time, controls mould
Root tuber controls opening for multiple electric expansion valves according to the deviation of suction superheat, suction superheat rate of change and the first default control table
Degree, i.e., calculate suction superheat deviation and the suction superheat rate of change in certain time by gathering, and two dimension fitting is calculated
To electronic expansion valve controls step number, cold medium flux and flow direction can be accurately controlled, the operational efficiency of unit is improved, and
By each electric expansion valve and four-way valve combination control, reach that each finned heat exchanger can individually defrost, realize
The continuously heating of unit, so as to improve Consumer's Experience.
According to one embodiment of present invention, the first default control table includes the inclined of multiple sample suction superheats
The control step number of poor, multiple sample suction superheat rates of change and the multiple electric expansion valve, wherein, the control step number
And the deviation and sample suction superheat rate of change of each pair sample suction superheat have corresponding relation.
According to one embodiment of present invention, the control module specifically for：According to the deviation of the suction superheat,
The suction superheat rate of change searches the first default control table, obtains the control step of corresponding multiple electric expansion valves
Number；The aperture of the multiple electric expansion valve is adjusted according to the control step number.
According to one embodiment of present invention, the control module is additionally operable to：In the multiple finned heat exchanger is detected
At least one finned heat exchanger when entering defrosting state, close the corresponding electric expansion valve of at least one finned heat exchanger
And four-way valve；When at least one described finned heat exchanger of detection exits the defrosting state, at least one described fin of control
The corresponding electric expansion valve of heat exchanger opens default opening value every the preset time, until at least one fin heat exchange
The master control time of the corresponding electric expansion valve of device is more than or equal to the very first time threshold value, or, the air-cooled screw machine
The current suction superheat of group be more than or equal to the default suction superheat and preset value and untill.
According to one embodiment of present invention, the control device also includes：3rd acquisition module, for obtaining the wind
The current pressure values of cold Screw chiller；First judge module, for judging whether the current pressure values are more than first pressure threshold
Value；Second judge module, for judging that the current pressure values are more than the first pressure threshold value in first judge module
When, judge whether to meet default hypertonia protective condition；3rd judge module, for judging in second judge module
During the hypertonia protective condition run into described in meeting, judge whether the current pressure values are less than second pressure threshold value, wherein,
The second pressure threshold value is more than the first pressure threshold value；The control module is additionally operable to judge in the 3rd judge module
When the current pressure values are less than the second pressure threshold value, according to the deviation of current suction superheat and current air-breathing mistake
Temperature rate of change obtains the control step number of electric expansion valve, and when the control step number is less than 0, is adjusted according to the control step number
The aperture of the electric expansion valve is saved, and when the control step number is more than or equal to 0, maintains opening for the electric expansion valve
Degree；The control module is additionally operable to judge that the current pressure values are more than or equal to the described second pressure in the 3rd judge module
During force threshold, the control of electric expansion valve is obtained according to the deviation of current suction superheat and current suction superheat rate of change
Step number processed, and when the control step number is less than the first default step Numerical, the electronic expansion is adjusted according to the control step number
The aperture of valve, and when the control step number is more than or equal to the described first default step Numerical, according to the described first default step
Numerical value adjusts the aperture of the electric expansion valve.
According to one embodiment of present invention, the control module is additionally operable to：Detecting the suction of the air-cooled screw unit
When the gas degree of superheat is less than 0, the aperture of the multiple electric expansion valve is maintained；Detecting the suction superheat of the air-cooled screw unit
When degree is less than or equal to 0, then electronics is obtained according to the deviation of current suction superheat and current suction superheat rate of change
The control step number of expansion valve, and when the control step number is less than the second default step Numerical, according to the control step number regulation institute
The aperture of electric expansion valve is stated, and when the control step number is more than or equal to the described second default step Numerical, according to described
Second default step Numerical adjusts the aperture of the electric expansion valve.
According to one embodiment of present invention, first acquisition module is additionally operable to obtain described air-cooled every preset time
The current exhaust degree of superheat of Screw chiller, and discharge superheat is obtained according to the current exhaust degree of superheat and default discharge superheat
The deviation of degree；Second acquisition module is additionally operable to obtain the discharge superheat rate of change in the preset time；The control
Module is additionally operable to deviation, the discharge superheat rate of change and the second default control table control institute according to the discharge superheat
State the aperture of multiple electric expansion valves.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and be readily appreciated that, 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 process according to an embodiment of the invention；
Fig. 3 is the structural frames of the control device for electronic expansion valve of air-cooled screw unit according to an embodiment of the invention
Figure；And
Fig. 4 is the structural frames of the control device for electronic expansion valve of the air-cooled screw unit according to another embodiment of the invention
Figure.
Reference：
First acquisition module 10, the second acquisition module 20, control module 30, the 3rd acquisition module 40, the first judge module
50th, the second judge module 60 and the 3rd judge module 70.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
Below with reference to the accompanying drawings control method for electronic expansion valve and the control of the air-cooled screw unit of the embodiment of the present invention described
Device.
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 may include compressor, multiple electric expansion valves, multiple
Four-way valve, multiple finned heat exchangers, and each finned heat exchanger configures an electric expansion valve and four-way valve.Wherein, in this hair
In bright description, " multiple " are meant that at least two, such as two, three etc., unless otherwise specifically defined.
As shown in figure 1, the control method for electronic expansion valve of the air-cooled screw unit can include：
S101, the current suction superheat of air-cooled screw unit is obtained every preset time, and according to current suction superheat
Degree and default suction superheat obtain the deviation of suction superheat.
When specifically, can gather suction temperature, pressure of inspiration(Pi) and the pressure of inspiration(Pi) of air-cooled screw unit in real time
Saturation temperature etc., and can periodically be calculated every preset time according to the above-mentioned data collected, calculate air-cooled screw machine
The current suction superheat of group, and the difference between it is calculated according to current suction superheat and default suction superheat, by this
Difference as suction superheat deviation ERssh.That is, air-breathing can periodically be obtained using preset time as a cycle
The deviation of the degree of superheat.
S102, obtains the suction superheat rate of change in preset time.
Specifically, when obtaining the deviation of suction superheat, can also according to the suction superheat gathered in preset time,
And preset time calculates the suction superheat rate of change DRssh in the preset time.
S103, multiple electricity are controlled according to the deviation of suction superheat, suction superheat rate of change and the first default control table
The aperture of sub- expansion valve.
Wherein, in an embodiment of the present invention, the first default control table can be set in advance, and the first default control table can
The control of deviation including multiple sample suction superheats, multiple sample suction superheat rates of change and multiple electric expansion valves
Step number, wherein, there is correspondence to close for the deviation and sample suction superheat rate of change of control step number and each pair sample suction superheat
System.It is appreciated that in an embodiment of the present invention, the first default control table can be set up by following steps：Can be by every one
(such as 1 minute) collection suction temperature of air-cooled screw unit, pressure of inspiration(Pi) data are fixed time to calculate multiple suction superheats
Degree, and calculated according to the suction superheat and default suction superheat and obtain suction superheat deviation per minute, and by these
Deviation as multiple sample suction superheats deviation；And can be according to the number such as the above-mentioned suction temperature collected, pressure of inspiration(Pi)
Suction superheat rate of change per minute is obtained according to calculating, and is changed these rates of change as multiple sample suction superheats
Rate；Then, two-dimensional matrix table is listed with the deviation of multiple sample suction superheats and multiple sample suction superheat rates of change, such as
Tieed up using the deviation of suction superheat as the first of matrix table the dimension, sample suction superheat rate of change as the second of matrix table,
The first dimension point intersected with the second dimension is set to the control step number of electric expansion valve.It is appreciated that control step number is according to big
Empirical value obtained from amount experiment.
Specifically, in an embodiment of the present invention, according to the deviation of suction superheat, suction superheat rate of change and
One default control table controls the process that implements of the aperture of multiple electric expansion valves can be as follows：According to the inclined of suction superheat
Difference, suction superheat rate of change search the first default control table, obtain the control step number of corresponding multiple electric expansion valves；According to
Step number is controlled to adjust the aperture of multiple electric expansion valves.More specifically, the deviation of suction superheat, suction superheat can be changed
The deviation of rate and the sample suction superheat in the first default control table, sample suction superheat rate of change are compared, and are searched
To and suction superheat the corresponding sample suction superheat of deviation, suction superheat rate of change size deviation, sample air-breathing
Degree of superheat rate of change, afterwards can according to the deviation of sample suction superheat, that sample suction superheat rate of change finds its is corresponding
The control step number of electric expansion valve, and control the stepper motor of electric expansion valve to adjust electric expansion valve according to the control step number
Aperture.Wherein it is possible to understand, if controlling step number for just, then it represents that the aperture of electric expansion valve will be increased；If control step
Number is negative, then it represents that will reduce the aperture of electric expansion valve.
Thus, by configuring an electric expansion valve and four-way valve to each finned heat exchanger, and each control week is passed through
Phase (i.e. above-mentioned preset time) is by the deviation of current suction superheat and suction superheat rate of change and the first default control
Table is compared, to obtain the control step number of current each electric expansion valve, can be controlled afterwards according to the control step number each
The aperture of electric expansion valve, can accurately control cold medium flux and flow direction in unit, improve the operational efficiency of unit.
It should be noted that being controlled every preset time according to the deviation of suction superheat, suction superheat rate of change
During the aperture of electric expansion valve, when occurring, finned heat exchanger defrosts, current pressure values are too high, the current degree of superheat is excessively low
During boundary condition, also need to carry out electric expansion valve according to different boundary conditions different regulations, will be situated between one by one below
Continue description.
1) defrosting protection control：
When needing defrosting for some finned heat exchanger, the logic control in defrosting stage can be entered, specifically, in this hair
In bright one embodiment, the control method for electronic expansion valve of the air-cooled screw unit may also include：When the multiple fins of detection are changed
When at least one finned heat exchanger in hot device enters defrosting state, the corresponding electronic expansion of at least one finned heat exchanger is closed
Valve and four-way valve；When detecting that at least one finned heat exchanger exits defrosting state, at least one finned heat exchanger correspondence is controlled
Electric expansion valve open default opening value every preset time；Judge the corresponding electric expansion valve of at least one finned heat exchanger
The master control time whether be 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 corresponding electronic expansion of at least one finned heat exchanger
The master control time of valve be 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 repeat step S101-S103.
More specifically, when needing defrosting for some fin, when the finned heat exchanger enters defrosting state, can close
The corresponding electric expansion valve of the finned heat exchanger and four-way valve.When finned heat exchanger exits defrosting state, in special time
In Tdefout (wherein, special time is more than or equal to preset time), corresponding electric expansion valve is controlled to open every preset time
Certain step number Mdefout (i.e. above-mentioned default opening value) is opened, it is current until either being met after the special time Tdefout times
Suction superheat be more than or equal to default suction superheat and preset value (such as 2 degree) and, can be according to normal logic control, you can
The aperture of electric expansion valve is controlled according to the above-mentioned deviation according to suction superheat and suction superheat rate of change.
2) MOP controls (i.e. hypertonia protection control)：
It should be noted that MOP controls need to be effective after compressor operating, and a full timing after four-way Vavle switching
Between (such as 2 minutes) and air-cooled screw unit could carry out MOP controls when being in non-defrosting state.Specifically, the one of the present invention
In individual embodiment, as shown in Fig. 2 the control method for electronic expansion valve of the air-cooled screw unit may also include MOP control process, tool
Body, the MOP control process may include：The current pressure values of air-cooled screw unit are obtained, and judge whether current pressure values are big
In first pressure threshold value (S201)；If current pressure values are more than first pressure threshold value, further determine whether to meet default
Hypertonia protective condition (S202)；If meeting the hypertonia protective condition run into, current pressure is determined whether
Whether value is less than second pressure threshold value (S203), wherein, second pressure threshold value is more than first pressure threshold value；If current pressure values
Less than second pressure threshold value, then electronics is obtained according to the deviation of current suction superheat and current suction superheat rate of change
The control step number (S204) of expansion valve, and when controlling step number to be less than 0, the aperture of electric expansion valve is adjusted according to control step number
(S205), and when controlling step number to be more than or equal to 0, the aperture (S206) of electric expansion valve is maintained；If current pressure values
More than or equal to second pressure threshold value, then obtained according to the deviation of current suction superheat and current suction superheat rate of change
The control step number (S207) of electric expansion valve is taken, and when controlling step number to be less than the first default step Numerical, is adjusted according to control step number
The aperture (S208) of electric expansion valve is saved, and when controlling step number to be more than or equal to the first default step Numerical, it is pre- according to first
If step Numerical adjusts the aperture (S209) of electric expansion valve.
Wherein, in an embodiment of the present invention, meeting default hypertonia protective condition includes：Compressor run,
Reach that certain time (such as 2 minutes) and unit are in non-defrosting state after four-way Vavle switching.
More specifically, the current pressure values Pe of air-cooled screw unit can be obtained, and in Pe ＞ MOP-Pcr (i.e. above-mentioned
One pressure threshold) when, whether judgement currently meets above-mentioned default hypertonia protective condition, if it is not, not entering MOP controls then
System, otherwise needs to determine whether whether current pressure values Pe is less than MOP (i.e. above-mentioned second pressure threshold value), if MOP ＞ Pe
＞ MOP-Pcr, then according to the deviation of current suction superheat and current suction superheat rate of change from the first default control
The control step number M of electric expansion valve is obtained in table, and when controlling step number M to be less than 0, adjusts electronics according to control step number M swollen
The aperture of swollen valve, it is logical when maintaining the aperture of electric expansion valve, i.e. current pressure values too high if control step number M is more than or equal to 0
Cross and reduce the aperture of electric expansion valve to reduce current pressure., can be according to the deviation of current suction superheat as Pe >=MOP
The control step number M of electric expansion valve is obtained from the first default control table with current suction superheat rate of change, and in control
When step number M is less than Mmop (the default step Numerical of i.e. above-mentioned first, such as -15), the aperture of electric expansion valve is adjusted according to the Mmop,
If controlling step number M >=Mmop, the aperture of electric expansion valve is adjusted according to Mmop.Thus, control to cause working as unit by MOP
Preceding pressure value control is in normal range (NR), to ensure the normal operation of compressor.
If, can be according to normal control logic control, i.e., according to suction it is appreciated that current pressure values Pe≤MOP-Pcr
Deviation, suction superheat rate of change and the first default control table of the gas degree of superheat control the aperture of electric expansion valve.
3) low overheat protection control：
In order to ensure the normal operation of air-cooled screw unit, when there is the too low situation of suction superheat, difference can be passed through
Processing control the aperture of electric expansion valve, optionally, in one embodiment of the invention, the electricity of the air-cooled screw unit
Sub- expansion valve control method may also include：When the suction superheat for detecting air-cooled screw unit is less than 0, maintain multiple electronics swollen
The aperture of swollen valve；When the suction superheat for detecting air-cooled screw unit is less than or equal to 0, then according to current suction superheat
Deviation and current suction superheat rate of change obtain the control step number of electric expansion valve, and it is pre- in control step number to be less than second
If during step Numerical, the aperture of electric expansion valve being adjusted according to control step number, and is more than or equal to second in control step number and is preset
During step Numerical, the aperture of electric expansion valve is adjusted according to the second default step Numerical.
Specifically, in the running of air-cooled screw unit, when suction superheat is less than 0, it can control electronic expansion
The aperture of valve keeps constant；, can be according to the deviation of current suction superheat and current when suction superheat is less than or equal to 0
Suction superheat rate of change the control step number of electric expansion valve is obtained from the first default control table, it is and small in the control step number
When the second default step Numerical, the aperture of electric expansion valve can be adjusted according to the control step number, if the control step number is more than or waited
In the second default step Numerical, then the aperture of electric expansion valve is adjusted according to the second default step Numerical.
Optionally, in one embodiment of the invention, the control method for electronic expansion valve of the air-cooled screw unit may be used also
Including：The current exhaust degree of superheat of air-cooled screw unit is obtained every preset time, and according to the current exhaust degree of superheat and is preset
Discharge superheat obtains the deviation of discharge superheat；Obtain the discharge superheat rate of change in preset time；And according to exhaust
Deviation, discharge superheat rate of change and the second default control table of the degree of superheat control the aperture of multiple electric expansion valves.It can manage
Solution, in the running of air-cooled screw unit, the deviation and the current exhaust degree of superheat that can also calculate the current exhaust degree of superheat become
Rate, and deviation and current exhaust degree of superheat rate of change according to the current exhaust degree of superheat obtain from the second default control table
The control step number of electric expansion valve, can adjust the aperture of electric expansion valve according to the control step number afterwards.It should be noted that
In the running of air-cooled screw unit, the processing of the processing of suction superheat prior to discharge superheat.
The control method for electronic expansion valve of air-cooled screw unit according to embodiments of the present invention, wind is obtained every preset time
The current suction superheat of cold Screw chiller, and suction superheat is obtained according to current suction superheat and default suction superheat
Deviation, and obtain the suction superheat rate of change in preset time, and deviation, suction superheat according to suction superheat
Rate of change and the first default control table control the aperture of multiple electric expansion valves, i.e., by gather calculate suction superheat deviation and
Suction superheat rate of change in certain time, two dimension fitting, calculating obtains electronic expansion valve controls step number, can accurately controlled
Cold medium flux processed and flow direction, improve the operational efficiency of unit, and combine by each electric expansion valve and four-way valve
Control, reaches that each finned heat exchanger can individually defrost, realizes the continuously heating of unit, so as to improve user's body
Test.
In order to realize above-described embodiment, the invention also provides a kind of electronic expansion valve controls of air-cooled screw unit dress
Put.
Fig. 3 is the structural frames of the control device for electronic expansion valve of air-cooled screw unit according to an embodiment of the invention
Figure.It should be noted that in an embodiment of the present invention, air-cooled screw unit may include compressor, multiple electric expansion valves, many
Individual four-way valve, multiple finned heat exchangers, and each finned heat exchanger configures an electric expansion valve and four-way valve.
As shown in figure 3, the control device for electronic expansion valve of the air-cooled screw unit can include：First acquisition module 10,
Second acquisition module 20 and control module 30.
Specifically, the first acquisition module 10 can be used for the current suction superheat that air-cooled screw unit is obtained every preset time
Degree, and according to current suction superheat and the deviation of default suction superheat acquisition suction superheat.More specifically, first obtains
Module 10 can gather saturation temperature when suction temperature, pressure of inspiration(Pi) and the pressure of inspiration(Pi) of air-cooled screw unit in real time
Deng, and can periodically be calculated every preset time according to the above-mentioned data collected, calculate the current of air-cooled screw unit
Suction superheat, and the difference between it is calculated according to current suction superheat and default suction superheat, using the difference as
The deviation ERssh of suction superheat.That is, suction superheat can periodically be obtained using preset time as a cycle
Deviation.
Second acquisition module 20 can be used for obtaining the suction superheat rate of change in preset time.More specifically, second obtains
Modulus block 20, can be according to the air-breathing mistake gathered in preset time when the first acquisition module 10 obtains the deviation of suction superheat
Temperature and preset time calculate the suction superheat rate of change DRssh in the preset time.
Control module 30 can be used for 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 valves.Wherein, in an embodiment of the present invention, the first default control table can be to preset
, the first default control table may include the deviations of multiple sample suction superheats, multiple sample suction superheat rates of change and
The control step number of multiple electric expansion valves, wherein, the deviation and sample air-breathing mistake of control step number and each pair sample suction superheat
Temperature rate of change has corresponding relation.It is appreciated that in an embodiment of the present invention, first being set up in the following manner and is preset
Control table：Can be gathered by (such as 1 minute) at regular intervals the suction temperature of air-cooled screw unit, pressure of inspiration(Pi) data with
Multiple suction superheats are calculated, and every point of suction superheat is obtained according to the suction superheat and the calculating of default suction superheat
The deviation of clock, and using these deviations as multiple sample suction superheats deviation；And can be according to the above-mentioned air-breathing collected
The data such as temperature, pressure of inspiration(Pi) calculate and obtain suction superheat rate of change per minute, and regard these rates of change as multiple samples
This suction superheat rate of change；Then, with the deviation of multiple sample suction superheats and multiple sample suction superheat rates of change
Two-dimensional matrix table is listed, is made such as using the deviation of suction superheat as the first of matrix table the dimension, sample suction superheat rate of change
For the second dimension of matrix table, the first dimension point intersected with the second dimension is set to the control step number of electric expansion valve.It is appreciated that
It is the empirical value according to obtained from many experiments to control step number.
Specifically, in an embodiment of the present invention, deviation, suction superheat of the control module 30 according to suction superheat
Rate of change and the first default control table control the process that implements of the aperture of multiple electric expansion valves can be as follows：According to air-breathing mistake
The deviation of temperature, suction superheat rate of change search the first default control table, obtain the control of corresponding multiple electric expansion valves
Step number；The aperture of multiple electric expansion valves is adjusted according to control step number.
More specifically, control module 30 can be by the default control of the deviation of suction superheat, suction superheat rate of change and first
The deviation of sample suction superheat in tabulation, sample suction superheat rate of change are compared, and are found and suction superheat
Deviation, the deviation of the corresponding sample suction superheat of suction superheat rate of change size, sample suction superheat rate of change, it
The control of its corresponding electric expansion valve can be found according to the deviation of sample suction superheat, sample suction superheat rate of change afterwards
Step number, and control the stepper motor of electric expansion valve to adjust the aperture of electric expansion valve according to the control step number.Wherein it is possible to
Understand, if controlling step number for just, then it represents that the aperture of electric expansion valve will be increased；If it is negative to control step number, then it represents that will
Reduce the aperture of electric expansion valve.
Thus, by configuring an electric expansion valve and four-way valve to each finned heat exchanger, and each control week is passed through
Phase (i.e. above-mentioned preset time) is by the deviation of current suction superheat and suction superheat rate of change and the first default control
Table is compared, to obtain the control step number of current each electric expansion valve, can be controlled afterwards according to the control step number each
The aperture of electric expansion valve, can accurately control cold medium flux and flow direction in unit, improve the operational efficiency of unit.
It should be noted that being controlled every preset time according to the deviation of suction superheat, suction superheat rate of change
During the aperture of electric expansion valve, when occurring, finned heat exchanger defrosts, current pressure values are too high, the current degree of superheat is excessively low
During boundary condition, also need to carry out electric expansion valve according to different boundary conditions different regulations, will be situated between one by one below
Continue description.
When needing defrosting for some finned heat exchanger, the logic control in defrosting stage can be entered, specifically, in this hair
In bright one embodiment, control module 30 can be additionally used in：At least one fin heat exchange in multiple finned heat exchangers are detected
When device enters defrosting state, the corresponding electric expansion valve of at least one finned heat exchanger and four-way valve are closed；In detection at least one
When individual finned heat exchanger exits defrosting state, the corresponding electric expansion valve of at least one finned heat exchanger is controlled every preset time
Default opening value is opened, until the master control time of the corresponding electric expansion valve of at least one finned heat exchanger is more than or equal to the
One time threshold, or, the current suction superheat of air-cooled screw unit is more than or equal to default suction superheat and preset value
And untill.
More specifically, when needing defrosting for some fin, when the finned heat exchanger enters defrosting state, controlling mould
Block 30 can close the corresponding electric expansion valve of the finned heat exchanger and four-way valve.When finned heat exchanger exits defrosting state,
In special time Tdefout (wherein, special time is more than or equal to preset time), control module 30 can be every preset time control
Make corresponding electric expansion valve and open certain step number Mdefout (i.e. above-mentioned default opening value), until special time Tdefout
Either met after time current suction superheat be more than or equal to default suction superheat and preset value (such as 2 degree) and, can
According to normal logic control, you can control electronics swollen with suction superheat rate of change according to the above-mentioned deviation according to suction superheat
The aperture of swollen valve.
It should be noted that in the running of unit, can also carry out MOP controls, MOP controls need to be transported in compressor
After row effectively, full certain time (such as 2 minutes) and when air-cooled screw unit is in non-defrosting state and after four-way Vavle switching
MOP controls could be carried out.Specifically, in one embodiment of the invention, as shown in figure 4, the electronics of the air-cooled screw unit
Expansion control valve device may also include：3rd acquisition module 40, the first judge module 50, the second judge module 60 and the 3rd judge
Module 70.
Specifically, the 3rd acquisition module 40 can be used for the current pressure values for obtaining air-cooled screw unit.First judge module
50 can be used for judging whether current pressure values are more than first pressure threshold value.Second judge module 60 can be used in the first judge module
50 judge current pressure values be more than first pressure threshold value when, judge whether to meet default hypertonia protective condition.3rd sentences
Disconnected module 70 can be used for, when the second judge module 60 judges to meet the hypertonia protective condition run into, judging current pressure values
Whether second pressure threshold value is less than, wherein, second pressure threshold value is more than first pressure threshold value.Wherein, in embodiments of the invention
In, meeting default hypertonia protective condition includes：Compressor has been run, reached certain time (such as 2 after four-way Vavle switching
Minute) and unit in non-defrosting state etc..
In an embodiment of the present invention, control module 30 can also be used to judge that current pressure values are small in the 3rd judge module 70
When second pressure threshold value, electronics is obtained according to the deviation of current suction superheat and current suction superheat rate of change swollen
The control step number of swollen valve, and when controlling step number to be less than 0, the aperture of electric expansion valve is adjusted according to control step number, and in control
When step number processed is more than or equal to 0, the aperture of electric expansion valve is maintained.
In an embodiment of the present invention, control module 30 can also be used to judge that current pressure values are big in the 3rd judge module 70
When second pressure threshold value, obtained according to the deviation of current suction superheat and current suction superheat rate of change
The control step number of electric expansion valve, and when controlling step number to be less than the first default step Numerical, it is swollen according to control step number regulation electronics
The aperture of swollen valve, and when controlling step number to be more than or equal to the first default step Numerical, according to the first default step Numerical regulation electricity
The aperture of sub- expansion valve.
More specifically, the 3rd acquisition module 40 can obtain the current pressure values Pe of air-cooled screw unit, and judge first
When module 50 judges Pe ＞ MOP-Pcr (i.e. above-mentioned first pressure threshold value), the second judge module 60 judges currently whether meet
Above-mentioned default hypertonia protective condition, if it is not, not entering MOP controls then, otherwise the 3rd judge module 70 judges currently
Whether pressure value P e is less than MOP (i.e. above-mentioned second pressure threshold value), if MOP ＞ Pe ＞ MOP-Pcr, the then root of control module 30
Electronics is obtained from the first default control table according to the deviation and current suction superheat rate of change of current suction superheat swollen
The control step number M of swollen valve, and when controlling step number M to be less than 0, the aperture of electric expansion valve is adjusted according to control step number M, if control
Step number M processed is more than or equal to 0, then maintains the aperture of electric expansion valve, i.e., by reducing electronic expansion when current pressure values are too high
The aperture of valve reduces current pressure.As Pe >=MOP, control module 30 according to the deviation of current suction superheat and can be worked as
Preceding suction superheat rate of change obtains the control step number M of electric expansion valve from the first default control table, and in control step number M
During less than Mmop (the default step Numerical of i.e. above-mentioned first, such as -15), the aperture of electric expansion valve is adjusted according to the Mmop, if control
Step number M >=Mmop processed, then adjust the aperture of electric expansion valve according to Mmop.Thus, control to cause the current pressure of unit by MOP
Force value is controlled in normal range (NR), to ensure the normal operation of compressor.
If, can be according to normal control logic control, i.e., according to suction it is appreciated that current pressure values Pe≤MOP-Pcr
Deviation, suction superheat rate of change and the first default control table of the gas degree of superheat control the aperture of electric expansion valve.
In order to ensure the normal operation of air-cooled screw unit, when there is the too low situation of suction superheat, difference can be passed through
Processing control the aperture of electric expansion valve, optionally, in one embodiment of the invention, control module 30 also can use
In：When the suction superheat for detecting air-cooled screw unit is less than 0, the aperture of multiple electric expansion valves is maintained；It is air-cooled detecting
When the suction superheat of Screw chiller is less than or equal to 0, then according to the deviation of current suction superheat and current air-breathing mistake
Temperature rate of change obtains the control step number of electric expansion valve, and when controlling step number to be less than the second default step Numerical, according to control
Step number adjusts the aperture of electric expansion valve, and when controlling step number to be more than or equal to the second default step Numerical, it is pre- according to second
If step Numerical adjusts the aperture of electric expansion valve.
Specifically, in the running of air-cooled screw unit, when suction superheat is less than 0, control module 30 is controllable
The aperture of electric expansion valve processed keeps constant；When suction superheat is less than or equal to 0, control module 30 can be according to current suction
The deviation of the gas degree of superheat and current suction superheat rate of change obtain the control of electric expansion valve from the first default control table
Step number, and when the control step number is less than the second default step Numerical, the aperture of electric expansion valve can be adjusted according to the control step number,
If the control step number is more than or equal to the second default step Numerical, electric expansion valve is adjusted according to the second default step Numerical
Aperture.
Further, in one embodiment of the invention, the first acquisition module 10 can also be used to obtain every preset time
The current exhaust degree of superheat of air-cooled screw unit is taken, and was vented according to the current exhaust degree of superheat and the acquisition of default discharge superheat
The deviation of temperature.Second acquisition module 20 can also be used to obtain the discharge superheat rate of change in preset time.Control module 30
It can be additionally used in deviation, discharge superheat rate of change and the second default control table according to discharge superheat and control multiple electronic expansions
The aperture of valve.It is appreciated that in the running of air-cooled screw unit, can also calculate the deviation of the current exhaust degree of superheat and work as
Front exhaust degree of superheat rate of change, and the deviation and current exhaust degree of superheat rate of change according to the current exhaust degree of superheat are pre- from second
If obtaining the control step number of electric expansion valve in control table, opening for electric expansion valve can be adjusted according to the control step number afterwards
Degree.It should be noted that in the running of air-cooled screw unit, the processing of suction superheat is prior to discharge superheat
Processing.
The control device for electronic expansion valve of air-cooled screw unit according to embodiments of the present invention, can pass through the first acquisition module
The current suction superheat of air-cooled screw unit is obtained every preset time, and according to current suction superheat and default air-breathing mistake
Temperature obtains the deviation of suction superheat, and the second acquisition module obtains the suction superheat rate of change in preset time, controls mould
Root tuber controls opening for multiple electric expansion valves according to the deviation of suction superheat, suction superheat rate of change and the first default control table
Degree, i.e., calculate suction superheat deviation and the suction superheat rate of change in certain time by gathering, and two dimension fitting is calculated
To electronic expansion valve controls step number, cold medium flux and flow direction can be accurately controlled, the operational efficiency of unit is improved, and
By each electric expansion valve and four-way valve combination control, reach that each finned heat exchanger can individually defrost, realize
The continuously heating of unit, so as to improve Consumer's Experience.
In the description of the invention, it is to be understood that term " first ", " second " are only used for describing purpose, and can not
It is interpreted as indicating or implies relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " the
One ", at least one this feature can be expressed or be implicitly included to the feature of " second ".In the description of the invention, " multiple "
It is meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described
Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office
Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area
Art personnel can be tied the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification
Close and combine.
Any process described otherwise above or method description are construed as in flow chart or herein, represent to include
Module, fragment or the portion of the code of one or more executable instructions for the step of realizing specific logical function or process
Point, and the scope of the preferred embodiment of the present invention includes other realization, wherein can not be by shown or discussion suitable
Sequence, including according to involved function by it is basic simultaneously in the way of or in the opposite order, carry out perform function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
Represent in flow charts or logic and/or step described otherwise above herein, for example, being considered use
In the order list for the executable instruction for realizing logic function, it may be embodied in any computer-readable medium, for
Instruction execution system, device or equipment (such as computer based system including the system of processor or other can be held from instruction
The system of row system, device or equipment instruction fetch and execute instruction) use, or combine these instruction execution systems, device or set
It is standby and use.For the purpose of this specification, " computer-readable medium " can any can be included, store, communicate, propagate or pass
Defeated program is for instruction execution system, device or equipment or the dress for combining these instruction execution systems, device or equipment and using
Put.The more specifically example (non-exhaustive list) of computer-readable medium includes following：Electricity with one or more wirings
Connecting portion (electronic installation), portable computer diskette box (magnetic device), random access memory (RAM), read-only storage
(ROM), erasable edit read-only storage (EPROM or flash memory), fiber device, and portable optic disk is read-only deposits
Reservoir (CDROM).In addition, can even is that can be in the paper of printing described program thereon or other are suitable for computer-readable medium
Medium, because can then enter edlin, interpretation or if necessary with it for example by carrying out optical scanner to paper or other media
His suitable method is handled electronically to obtain described program, is then stored in computer storage.
It should be appreciated that each several part of the present invention can be realized with hardware, software, firmware or combinations thereof.Above-mentioned
In embodiment, the software that multiple steps or method can in memory and by suitable instruction execution system be performed with storage
Or firmware is realized.If, and in another embodiment, can be with well known in the art for example, realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, the application specific integrated circuit with suitable combinational logic gate circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that to realize all or part of step that above-described embodiment method is carried
Rapid to can be by program to instruct the hardware of correlation to complete, described program can be stored in a kind of computer-readable storage medium
In matter, the program upon execution, including one or a combination set of the step of embodiment of the method.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing module, can also
That unit is individually physically present, can also two or more units be integrated in a module.Above-mentioned integrated mould
Block can both be realized in the form of hardware, it would however also be possible to employ the form of software function module is realized.The integrated module is such as
Fruit is realized using in the form of software function module and as independent production marketing or in use, can also be stored in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only storage, disk or CD etc..Although having been shown and retouching above
Embodiments of the invention are stated, it is to be understood that above-described embodiment is exemplary, it is impossible to be interpreted as the limit to the present invention
System, one of ordinary skill in the art can be changed to above-described embodiment, change, replace and become within the scope of the invention
Type.
Claims (12)
1. a kind of control method for electronic expansion valve of air-cooled screw unit, it is characterised in that the air-cooled screw unit includes pressure
Contracting machine, multiple electric expansion valves, multiple four-way valves, multiple finned heat exchangers, and one electronics of each finned heat exchanger configuration is swollen
Swollen valve and four-way valve, methods described include：
S1, the current suction superheat of the air-cooled screw unit is obtained every preset time, and according to the current air-breathing mistake
Temperature and default suction superheat obtain the deviation of suction superheat；
S2, obtains the suction superheat rate of change in the preset time；And
S3, according to the control of the deviation of the suction superheat, the suction superheat rate of change and the first default control table
The aperture of multiple electric expansion valves；
Wherein, when detecting that at least one finned heat exchanger in the multiple finned heat exchanger enters defrosting state, institute is closed
State the corresponding electric expansion valve of at least one finned heat exchanger and four-way valve；
When at least one described finned heat exchanger of detection exits the defrosting state, at least one described finned heat exchanger of control
Corresponding electric expansion valve opens default opening value every the preset time；
Judge whether the master control time of the corresponding electric expansion valve of at least one described finned heat exchanger is more than or equal to first
Time threshold, or, judge whether the current suction superheat of the air-cooled screw unit is more than or equal to the default air-breathing
The degree of superheat and preset value and；
If the master control time of the corresponding electric expansion valve of described at least one finned heat exchanger is more than or equal to described first
Time threshold, or, the current suction superheat of the air-cooled screw unit be more than or equal to the default suction superheat with
The sum of preset value, then repeat the step S1-S3.
2. the method as described in claim 1, it is characterised in that the first default control table includes multiple sample suction superheats
The control step number of the deviation of degree, multiple sample suction superheat rates of change and the multiple electric expansion valve, wherein, the control
The deviation and sample suction superheat rate of change of step number and each pair sample suction superheat processed have corresponding relation.
3. method as claimed in claim 2, it is characterised in that according to the deviation of the suction superheat, the suction superheat
Spend rate of change and the first default control table controls the aperture of the multiple electric expansion valve, specifically include：
The first default control table is searched according to the deviation of the suction superheat, the suction superheat rate of change, obtained
The control step number of corresponding multiple electric expansion valves；
The aperture of the multiple electric expansion valve is adjusted according to the control step number.
4. the method as any one of claim 1-3, it is characterised in that also include：
The current pressure values of the air-cooled screw unit are obtained, and judge whether the current pressure values are more than first pressure threshold
Value；
If the current pressure values are more than the first pressure threshold value, further determine whether to meet default hypertonia
Protective condition；
If meeting the default hypertonia protective condition, determine whether whether the current pressure values are less than second
Pressure threshold, wherein, the second pressure threshold value is more than the first pressure threshold value；
If the current pressure values are less than the second pressure threshold value, according to the deviation of current suction superheat and currently
Suction superheat rate of change obtain electric expansion valve control step number, and it is described control step number be less than 0 when, according to the control
Step number processed adjusts the aperture of the electric expansion valve, and when the control step number is more than or equal to 0, maintains the electronics swollen
The aperture of swollen valve；
If the current pressure values are more than or equal to the second pressure threshold value, according to the deviation of current suction superheat
The control step number of electric expansion valve is obtained with current suction superheat rate of change, and is less than first in the control step number and is preset
During step Numerical, the aperture of the electric expansion valve is adjusted according to the control step number, and be more than or wait in the control step number
When the described first default step Numerical, the aperture of the electric expansion valve is adjusted according to the described first default step Numerical.
5. the method as any one of claim 1-3, it is characterised in that also include：
When the suction superheat for detecting the air-cooled screw unit is less than 0, the aperture of the multiple electric expansion valve is maintained；
When the suction superheat for detecting the air-cooled screw unit is more than or equal to 0, then according to current suction superheat
Deviation and current suction superheat rate of change obtain the control step number of electric expansion valve, and are less than second in the control step number
During default step Numerical, the aperture of the electric expansion valve is adjusted according to the control step number, and be more than in the control step number
Or during equal to the described second default step Numerical, the aperture of the electric expansion valve is adjusted according to the described second default step Numerical.
6. the method as described in claim 1, it is characterised in that also include：
The current exhaust degree of superheat of the air-cooled screw unit is obtained every preset time, and according to the current exhaust degree of superheat
The deviation of discharge superheat is obtained with default discharge superheat；
Obtain the discharge superheat rate of change in the preset time；And
Controlled according to the deviation of the discharge superheat, the discharge superheat rate of change and the second default control table the multiple
The aperture of electric expansion valve.
7. a kind of control device for electronic expansion valve of air-cooled screw unit, it is characterised in that the air-cooled screw unit includes pressure
Contracting machine, multiple electric expansion valves, multiple four-way valves, multiple finned heat exchangers, and one electronics of each finned heat exchanger configuration is swollen
Swollen valve and four-way valve, described device include：
First acquisition module, the current suction superheat for obtaining the air-cooled screw unit every preset time, and according to
The current suction superheat and default suction superheat obtain the deviation of suction superheat；
Second acquisition module, for obtaining the suction superheat rate of change in the preset time；And
Control module, for the deviation according to the suction superheat, the suction superheat rate of change and the first default control
Table controls the aperture of the multiple electric expansion valve；
Wherein, the control module is additionally operable to：
When at least one finned heat exchanger in detecting the multiple finned heat exchanger enters defrosting state, described in closing at least
The corresponding electric expansion valve of one finned heat exchanger and four-way valve；
When at least one described finned heat exchanger of detection exits the defrosting state, at least one described finned heat exchanger of control
Corresponding electric expansion valve opens default opening value every the preset time, until at least one finned heat exchanger correspondence
Electric expansion valve the master control time be more than or equal to very first time threshold value, or, the current suction of the air-cooled screw unit
The gas degree of superheat be more than or equal to the default suction superheat and preset value and untill.
8. device as claimed in claim 7, it is characterised in that the first default control table includes multiple sample suction superheats
The control step number of the deviation of degree, multiple sample suction superheat rates of change and the multiple electric expansion valve, wherein, the control
The deviation and sample suction superheat rate of change of step number and each pair sample suction superheat processed have corresponding relation.
9. device as claimed in claim 8, it is characterised in that the control module specifically for：
The first default control table is searched according to the deviation of the suction superheat, the suction superheat rate of change, obtained
The control step number of corresponding multiple electric expansion valves；
The aperture of the multiple electric expansion valve is adjusted according to the control step number.
10. device as claimed in any one of claims 7-9, it is characterised in that also include：
3rd acquisition module, the current pressure values for obtaining the air-cooled screw unit；
First judge module, for judging whether the current pressure values are more than first pressure threshold value；
Second judge module, for judging that the current pressure values are more than the first pressure threshold value in first judge module
When, judge whether to meet default hypertonia protective condition；
3rd judge module, for second judge module judge meet the default hypertonia protective condition when,
Judge whether the current pressure values are less than second pressure threshold value, wherein, the second pressure threshold value is more than the first pressure
Threshold value；
The control module is additionally operable to judge that the current pressure values are less than the second pressure threshold in the 3rd judge module
During value, walked according to the control that the deviation of current suction superheat and current suction superheat rate of change obtain electric expansion valve
Number, and when the control step number is less than 0, the aperture of the electric expansion valve is adjusted according to the control step number, and in institute
When stating control step number more than or equal to 0, the aperture of the electric expansion valve is maintained；
The control module is additionally operable to judge that the current pressure values are more than or equal to described second in the 3rd judge module
During pressure threshold, electric expansion valve is obtained according to the deviation of current suction superheat and current suction superheat rate of change
Step number is controlled, and when the control step number is less than the first default step Numerical, the electronics is adjusted according to the control step number swollen
The aperture of swollen valve, and when the control step number is more than or equal to the described first default step Numerical, it is default according to described first
Step Numerical adjusts the aperture of the electric expansion valve.
11. device as claimed in any one of claims 7-9, it is characterised in that the control module is additionally operable to：
When the suction superheat for detecting the air-cooled screw unit is less than 0, the aperture of the multiple electric expansion valve is maintained；
When the suction superheat for detecting the air-cooled screw unit is more than or equal to 0, then according to current suction superheat
Deviation and current suction superheat rate of change obtain the control step number of electric expansion valve, and are less than second in the control step number
During default step Numerical, the aperture of the electric expansion valve is adjusted according to the control step number, and be more than in the control step number
Or during equal to the described second default step Numerical, the aperture of the electric expansion valve is adjusted according to the described second default step Numerical.
12. device as claimed in claim 7, it is characterised in that
First acquisition module is additionally operable to obtain the current exhaust degree of superheat of the air-cooled screw unit every preset time, and
The deviation of discharge superheat is obtained according to the current exhaust degree of superheat and default discharge superheat；
Second acquisition module is additionally operable to obtain the discharge superheat rate of change in the preset time；
It is default that the control module is additionally operable to deviation according to the discharge superheat, the discharge superheat rate of change and second
Control table controls the aperture of the multiple electric expansion valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510390167.8A CN105157292B (en) | 2015-07-06 | 2015-07-06 | The control method for electronic expansion valve and device of air-cooled screw unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510390167.8A CN105157292B (en) | 2015-07-06 | 2015-07-06 | The control method for electronic expansion valve and device of air-cooled screw unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105157292A CN105157292A (en) | 2015-12-16 |
| CN105157292B true CN105157292B (en) | 2017-08-29 |
Family
ID=54798244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510390167.8A Active CN105157292B (en) | 2015-07-06 | 2015-07-06 | The control method for electronic expansion valve and device of air-cooled screw unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105157292B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105972896B (en) * | 2016-05-24 | 2018-05-08 | 深圳市英维克科技股份有限公司 | A kind of control method of refrigeration system |
| CN106766335B (en) * | 2017-01-10 | 2019-03-12 | 珠海格力电器股份有限公司 | Control method for electronic expansion valve, device and heat pump unit |
| CN108955002A (en) * | 2017-05-26 | 2018-12-07 | 青岛海尔新能源电器有限公司 | A kind of control method for overheat and air source heat pump of iteration optimization |
| CN107933872B (en) * | 2017-11-07 | 2020-04-24 | 珠海格力电器股份有限公司 | Electronic expansion valve control method and device for ship water chilling unit |
| CN110857826A (en) * | 2018-08-22 | 2020-03-03 | 江苏美力格环境科技有限公司 | Dynamic superheat degree control method for air source cold and hot water unit |
| CN109708267B (en) * | 2019-01-06 | 2021-04-27 | 上海朗绿建筑科技股份有限公司 | Control method and system for electronic expansion valve of fresh air handling unit |
| CN111271814B (en) * | 2019-07-22 | 2021-08-31 | 宁波奥克斯电气股份有限公司 | Refrigerant flow control method and device and air conditioner |
| CN112443883B (en) * | 2019-08-28 | 2022-04-22 | 青岛海尔新能源电器有限公司 | Electronic expansion valve control method and device and heat pump unit |
| CN110779146B (en) * | 2019-11-12 | 2020-11-13 | 珠海格力电器股份有限公司 | Air conditioner and electronic expansion valve control method thereof, storage medium and computer equipment |
| CN111609533B (en) * | 2020-05-22 | 2022-07-12 | 海信空调有限公司 | Control method and device of electronic expansion valve |
| CN112594971A (en) * | 2020-12-16 | 2021-04-02 | 珠海格力电器股份有限公司 | Heat pump unit, heat pump unit control method and device |
| CN115371305A (en) * | 2022-07-26 | 2022-11-22 | 浙江中广电器集团股份有限公司 | Method for controlling opening degree of electronic expansion valve in defrosting process |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101469916A (en) * | 2007-12-26 | 2009-07-01 | Lg电子株式会社 | Air conditioning system |
| CN101498534A (en) * | 2008-12-08 | 2009-08-05 | 天津大学 | Multi-target intelligent control method for electronic expansion valve of refrigeration air conditioner heat pump system |
| CN101688699A (en) * | 2007-06-29 | 2010-03-31 | 大金工业株式会社 | Freezing apparatus |
| EP2372272A1 (en) * | 2008-12-19 | 2011-10-05 | Daikin Industries, Ltd. | Refrigeration equipment |
| CN102353117A (en) * | 2011-08-04 | 2012-02-15 | 宁波奥克斯电气有限公司 | System protection method for sudden indoor load change of variable refrigerant volume (VRV) air conditioner |
| JP2012127610A (en) * | 2010-12-17 | 2012-07-05 | Yanmar Co Ltd | Engine-driven air conditioner |
| CN102654337A (en) * | 2012-05-09 | 2012-09-05 | 海尔集团公司 | Control method of electronic expansion valve in air conditioner |
| CN103438547A (en) * | 2013-09-23 | 2013-12-11 | 深圳麦克维尔空调有限公司 | Control method of electronic expansion valve |
| CN103884140A (en) * | 2014-02-21 | 2014-06-25 | 海信（山东）空调有限公司 | Method and system for controlling discharge superheat degree of air conditioning compressor |
| CN104110799A (en) * | 2013-05-30 | 2014-10-22 | 广东美的制冷设备有限公司 | Integrated control method and circuit for electronic expansion valve of air conditioner |
| CN104713264A (en) * | 2013-12-11 | 2015-06-17 | 重庆美的通用制冷设备有限公司 | Air source heat pump set |
-
2015
- 2015-07-06 CN CN201510390167.8A patent/CN105157292B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688699A (en) * | 2007-06-29 | 2010-03-31 | 大金工业株式会社 | Freezing apparatus |
| CN101469916A (en) * | 2007-12-26 | 2009-07-01 | Lg电子株式会社 | Air conditioning system |
| CN101498534A (en) * | 2008-12-08 | 2009-08-05 | 天津大学 | Multi-target intelligent control method for electronic expansion valve of refrigeration air conditioner heat pump system |
| EP2372272A1 (en) * | 2008-12-19 | 2011-10-05 | Daikin Industries, Ltd. | Refrigeration equipment |
| JP2012127610A (en) * | 2010-12-17 | 2012-07-05 | Yanmar Co Ltd | Engine-driven air conditioner |
| CN102353117A (en) * | 2011-08-04 | 2012-02-15 | 宁波奥克斯电气有限公司 | System protection method for sudden indoor load change of variable refrigerant volume (VRV) air conditioner |
| CN102654337A (en) * | 2012-05-09 | 2012-09-05 | 海尔集团公司 | Control method of electronic expansion valve in air conditioner |
| CN104110799A (en) * | 2013-05-30 | 2014-10-22 | 广东美的制冷设备有限公司 | Integrated control method and circuit for electronic expansion valve of air conditioner |
| CN103438547A (en) * | 2013-09-23 | 2013-12-11 | 深圳麦克维尔空调有限公司 | Control method of electronic expansion valve |
| CN104713264A (en) * | 2013-12-11 | 2015-06-17 | 重庆美的通用制冷设备有限公司 | Air source heat pump set |
| CN103884140A (en) * | 2014-02-21 | 2014-06-25 | 海信（山东）空调有限公司 | Method and system for controlling discharge superheat degree of air conditioning compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105157292A (en) | 2015-12-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105157292B (en) | The control method for electronic expansion valve and device of air-cooled screw unit | |
| CN104848484B (en) | The control method and air conditioner of air conditioner | |
| CN107144054B (en) | The aperture control method and device of electric expansion valve | |
| CN110056981A (en) | A kind of heat-exchanging component, air-conditioner outdoor unit and its control method | |
| CN110470011A (en) | Control method and device, air-conditioning for air-conditioner defrosting | |
| CN110470006A (en) | Control method and device, air-conditioning for air-conditioner defrosting | |
| CN107143978A (en) | Air-conditioning system and its blower control method and device | |
| CN110057029A (en) | A kind of air-conditioner defrosting control method, device and air conditioner | |
| CN110470014A (en) | Control method and device, air-conditioning for air-conditioner defrosting | |
| WO2022217936A1 (en) | Control method and device for air conditioner, and air conditioner | |
| CN111928339A (en) | Outdoor unit heat exchanger, control method and control unit thereof and air conditioning system | |
| CN107664368A (en) | The control method and device of air-conditioning system and its electric expansion valve | |
| CN110469996A (en) | For the control method of air-conditioner defrosting, device and air-conditioning | |
| CN110470018A (en) | Control method and device, air-conditioning for air-conditioner defrosting | |
| CN110470019A (en) | Control method and device, air-conditioning for air-conditioner defrosting | |
| CN110470012B (en) | Control method and device for defrosting of air conditioner and air conditioner | |
| CN110470008A (en) | Control method and device, air-conditioning for air-conditioner defrosting | |
| CN110470023A (en) | Control method and device, air-conditioning for air-conditioner defrosting | |
| CN110470022A (en) | Control method and device, air-conditioning for air-conditioner defrosting | |
| CN110469977A (en) | For the control method of air-conditioner defrosting, device and air-conditioning | |
| CN110469992A (en) | For the control method of air-conditioner defrosting, device and air-conditioning | |
| CN110470000A (en) | For the control method of air-conditioner defrosting, device and air-conditioning | |
| CN105157338A (en) | Method and device for controlling variable temperature chamber of refrigerator | |
| CN212274093U (en) | Outer quick-witted heat exchanger and air conditioning system | |
| CN110470010A (en) | Control method and device, air-conditioning for air-conditioner defrosting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |