CN110529977A - A kind of multi-connected unit control system, control method and air conditioner - Google Patents
A kind of multi-connected unit control system, control method and air conditioner Download PDFInfo
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- CN110529977A CN110529977A CN201910862667.5A CN201910862667A CN110529977A CN 110529977 A CN110529977 A CN 110529977A CN 201910862667 A CN201910862667 A CN 201910862667A CN 110529977 A CN110529977 A CN 110529977A
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- expansion valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The present invention provides a kind of multi-connected unit control system, control method and air conditioner, it is related to field of air conditioning, the multi-connected unit control system includes more indoor units and an outdoor unit, the outdoor unit includes an auxiliary branch, one end of the auxiliary branch is connect with the liquid pipe of the multiple indoor unit, the other end of the auxiliary branch is connect with the tracheae of the multiple indoor unit in room, auxiliary electron expansion valve is provided on the auxiliary branch, side U pipe close to the auxiliary electron expansion valve is provided with the first temperature sensing package, auxiliary electron expansion valve side U pipe is provided with the second temperature sensing package.Multi-connected unit control system of the present invention in safe range by air-conditioning system operation control, can improve the comfort level of user under different operational modes.
Description
Technical field
The present invention relates to air-conditioning technical fields, in particular to a kind of multi-connected unit control system, control method and air-conditioning
Device.
Background technique
The prior art, multi-connected machine by an outdoor unit and multiple indoor units at.In use, user usually singly opens
One indoor unit uses, and when mono- indoor unit of Dan Kai, the outdoor unit of multi-connected machine there are compressor outputs excessive, internal-external heat exchanger device is not
The case where matching, causes to be operating abnormally, and compressor is caused to be constantly in unstable state, and use for a long time can shorten compressor
Service life.
Summary of the invention
In view of this, the present invention is directed to propose a kind of multi-connected unit control system, to solve at least to a certain extent
In terms of stating at least one of problem.
To solve the above problems, the present invention provides a kind of multi-connected unit control system, including more indoor units and a room
Outer machine, the outdoor unit include an auxiliary branch, and one end of the auxiliary branch is connect with the liquid pipe of the multiple indoor unit, institute
The other end for stating auxiliary branch is connect with the tracheae of the multiple indoor unit in room, and it is swollen to be provided with auxiliary electron on the auxiliary branch
Swollen valve, the side U pipe close to the auxiliary electron expansion valve are provided with the first temperature sensing package, far from the auxiliary electron expansion valve one
Side U pipe is provided with the second temperature sensing package.
As a result, by the auxiliary branch drawn, and the control of cold medium flux is carried out to its auxiliary branch, thus not to it
Compressor stability control is carried out with the air-conditioning system under mode, improves the comfort level of user.
Compared with the existing technology, multi-connected unit control system of the present invention has the advantage that
Multi-connected unit control system of the present invention can be under different operational modes, by air-conditioning system
In the safe range of operation, improve user is comfort level.
The present invention also provides a kind of multi-connected machine control methods, described more including multi-connected unit control system described above
On-line control method includes:
Current outdoor environment temperature T and booting indoor unit number of units are obtained, judges that the outdoor environment temperature T and booting are indoor
Whether board number meets preset condition；
If satisfied, then obtaining the pressure at expulsion and/or pressure of inspiration(Pi) of unit current compressor；
By judging pressure at expulsion and/or pressure of inspiration(Pi), opening or closing for the auxiliary electron expansion valve is controlled.
As a result, when meeting above-mentioned condition, auxiliary electron expansion valve is opened, and assists branch by electronic expansion valve controls
The flow on road, refrigerant pressure is excessively high when preventing high temperature from heating, when cryogenic refrigeration, the frequent anti-freeze problem of indoor unit.
Under heating mode, current outdoor environment temperature T is obtained, when the default environment temperature of outdoor environment temperature T >=the first
Spend T1And only open the pressure at expulsion P of 1 indoor unit and the compressor1>=the first preset pressure P3When, then control the auxiliary electricity
Sub- expansion valve is opened.
As a result, under heating mode, compressor overload operation in order to prevent, and then auxiliary electron expansion valve is opened.
The auxiliary electron expansion valve opens rate-determining steps further include:
Obtain current high pressure saturation temperature；
As high pressure saturation temperature the-the first temperature sensing package temperature T3The first preset temperature of >, then the auxiliary electron expansion valve is opened
Degree+M step；
As the second preset temperature≤high pressure saturation temperature the-the first temperature sensing package temperature T3It is described auxiliary when the≤the first preset temperature
Electronic expansion valve opening is helped to remain unchanged；
As high pressure saturation temperature the-the first temperature sensing package temperature T3When the second preset temperature of <, the auxiliary electron expansion valve is opened
Degree-N step.
When machine in 1P is singly opened in high temperature heating as a result, condensing pressure is reduced, runs compressor in safe range.
The first preset pressure P3Range are as follows: 30-40bar.
The preset pressure P as a result,3Range so that compressor is in hypersaturated state, prevent compressor from continuing to drop
Frequently, it can not be operated so as to cause compressor.
First preset temperature range are as follows: 6-8 DEG C.
The first preset temperature range setting purpose is as a result, when cold medium flux deficiency under the conditions of this preset temperature, control
The aperture of auxiliary electron expansion valve processed controls.
Second preset temperature range are as follows: 4-5 DEG C.
The second preset temperature range setting purpose is that the cold medium flux under the conditions of this preset temperature is excessive, in turn as a result,
Control the aperture control of auxiliary electron expansion valve.
Under refrigeration mode, current outdoor environment temperature T is obtained, when the default environment temperature of outdoor environment temperature≤the first
T1And when only opening 1 indoor unit, continue the pressure of inspiration(Pi) P for obtaining presently described compressor2≤ the second preset pressure P4When, then it controls
The auxiliary electron expansion valve is made to open.
When super low temperature refrigeration is run as a result, the anti-frequent anti-freeze protection of locking system causes system unstable.
The auxiliary electron expansion valve opens rate-determining steps further include:
As the second temperature sensing package temperature T4When low pressure saturation temperature > third preset temperature, the auxiliary electron expansion valve is opened
Degree+Q step；
As the 4th preset temperature≤second temperature sensing package temperature T4It is described auxiliary when low pressure saturation temperature≤third preset temperature
Electronic expansion valve opening is helped to remain unchanged；
As the second temperature sensing package temperature T4When low pressure saturation temperature four preset temperature of <, the auxiliary electron expansion valve is opened
Degree-P step.
When cryogenic refrigeration list opens machine in 1P as a result, evaporating pressure is promoted, system stable operation is made；
The multi-connected machine control method further includes,
In a heating mode, primary every the detection of the first preset time；
When the default environment temperature of outdoor environment temperature≤the second and defrost temperature sensing package temperature≤- A DEG C of outdoor environment temperature,
The auxiliary electron expansion valve is opened into R step, closes after maintaining the second preset time.
It heats outdoor heat exchanger bottom in advance as a result, accelerates defrost.
Control method of the present invention, can be under different operational modes, through the control for controlling auxiliary electron expansion valve
The system of its air conditioner is carried out stable operation, improves the comfort level of user by system.
The present invention also provides a kind of air conditioners, computer readable storage medium and place including being stored with computer program
Device is managed, when the computer program is read and run by the processor, realizes method described above.
Possessed advantage is identical compared with the existing technology with the control method for the air conditioner, and details are not described herein.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of multi-line system described in the embodiment of the present invention；
Fig. 2 is control method flow chart one described in the embodiment of the present invention；
Fig. 3 is the flowchart 2 under control method heating mode described in the embodiment of the present invention；
Fig. 4 is the flow chart 3 under control method refrigeration mode described in the embodiment of the present invention；
Fig. 5 is the flow chart four under control method heating mode described in the embodiment of the present invention.
Description of symbols:
1- outdoor heat exchanger, the first electric expansion valve of 2-, 3- auxiliary branch, 4- indoor heat exchanger, 5- four-way valve, 6- oil
Point, 7- compressor, 8- gas-liquid separator, 11- auxiliary U pipe, the first pipeline of 31-, 32- auxiliary electron expansion valve, the first temperature-sensitive of 33-
Packet, the second temperature sensing package of 34-, 41- minor valve, the big valve of 42-.
Specific embodiment
The prior art, multi-connected machine by an outdoor unit and multiple indoor units at.In use, user usually singly opens
One indoor unit uses, and when mono- indoor unit of Dan Kai, the outdoor unit of multi-connected machine there are compressor outputs excessive, internal-external heat exchanger device is not
The case where matching, causes to be operating abnormally, and compressor is caused to be constantly in unstable state, and use for a long time can shorten compressor
Service life.
For example, when the low windscreen operation of 1P indoor unit is singly opened in maximum heating, even if compressor minimizes frequency, but due to
Indoor unit is too small, and careat is excessive, causes condenser pressure is excessively high, is more than compressor to run allowed band；Super low temperature refrigeration
When singly opening the low windscreen operation of machine in 1P, even if compressor minimizes frequency, but since indoor machine evaporation is relatively too small, lead
Induced evaporation is bad, inner coil pipe temperature is low, causes frequent anti-freeze protection, system unstable, user also feels uncomfortable.In addition,
During defrost, it is clean that the frost of exchanger base needs long periodization, and interior machine stops heat supply at this time.The defrost time gets over
Short, indoor temperature fluctuation is with regard to smaller.So quick defrost, shortening defrost time, to being promoted, user's comfort is most important.
" first ", " second ", " third ", " the 4th " are only used for description mesh in the description of the present invention, it is to be understood that
, it is not understood to indicate or imply relative importance or implicitly indicates the quantity of indicated technical characteristic.
To make the above purposes, features and advantages of the invention more obvious and understandable, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.
As shown in Figure 1, a kind of multi-connected unit control system, including more indoor units and an outdoor unit, outdoor unit include
One auxiliary branch 3, by an auxiliary branch 3 of extraction, one end of auxiliary branch 3 is connect with the liquid pipe of multiple indoor units, another
End is connect with the tracheae of indoor unit；By carrying out the control of cold medium flux to auxiliary branch 3, thus to the sky under its different mode
Adjusting system carries out compressor stability control；Auxiliary branch 3 includes the auxiliary U pipe 11 that 1 bottom of outdoor heat exchanger is arranged in, due to
1 defrost of outdoor heat exchanger, icing, frosting most easily appear in bottom, therefore will assist U pipe 11 that the bottom of outdoor heat exchanger is arranged in；
One end of U pipe 11 is assisted to pass through the piping connection between the first pipeline 31 and outdoor heat exchanger 1 and the first electric expansion valve 2, the
One electric expansion valve 2 is provided with minor valve 41 by connecting between pipeline and indoor heat exchanger 4 on pipeline between the two；
Assist the piping connection between the other end and indoor heat exchanger 4 and four-way valve 5 of U pipe 11, indoor heat exchanger 4 and auxiliary U pipe 11
The other end between be provided with big valve 42, the four-way valve 5 also passes through pipeline and gas-liquid separator 8, outdoor heat exchanger 1 respectively
And oil 6 connects, oil 6 is connect with gas-liquid separator 8 and compressor 7 respectively by pipeline.It is provided on first pipeline 31
Auxiliary electron expansion valve 32, for controlling the flow on the first pipeline 31；Assist U pipe 11 close to the one of auxiliary electron expansion valve 32
Side U pipe is provided with the first temperature sensing package 33, for detecting temperature (i.e. the first temperature sensing package close to 32 roads of auxiliary electron expansion valve
Temperature T3)；Assist U pipe 11 that the side U pipe of auxiliary electron expansion valve 32 is provided with the second temperature sensing package 34, it is separate for detecting
Temperature (i.e. the second temperature sensing package temperature T of the side U pipe branch road of auxiliary electron expansion valve 324)。
Assisting U pipe 11 is one or more.When it is multiple for assisting U pipe 11, the first temperature sensing package 33 is positioned close to assist
The side of electric expansion valve 32, and the second temperature sensing package 34 is positioned close to the side of four-way valve 5.Auxiliary U pipe quantity can be with as a result,
For one or more, in superhigh temperature heating mode, condensing pressure is excessively high, the size of the flow by controlling auxiliary branch, to delay
The overload operation of decompression machine；In super low temperature refrigeration, by controlling the size of auxiliary branch flow, air-conditioning system can be prevented
It unites frequent anti-freeze program；Under normal heating mode, by the flow control for controlling auxiliary branch, moreover it is possible to be conducive to outdoor and change
The hot quick defrost of device.Multi-connected unit control system of the present invention can be under different operational modes, by air-conditioning system operation
In safe range, improve user is comfort level.
As shown in Fig. 2, the present invention also provides a kind of multi-connected machine control method, it is real by above-mentioned multi-connected unit control system
Existing, multi-connected machine control method includes:
S1, current outdoor environment temperature T and booting indoor unit number of units are obtained,
S2, judge whether the outdoor environment temperature T and booting indoor unit number of units meet preset condition.
S3, if satisfied, then obtaining the pressure at expulsion and/or pressure of inspiration(Pi) of unit current compressor；
S4, by judging pressure at expulsion and/or pressure of inspiration(Pi), control opening or closing for the auxiliary electron expansion valve.
The auxiliary electron expansion valve is controlled to open or close.Due under refrigeration or heating mode, due to only having 1 indoor unit, a meeting
Indoor heat exchange area is caused to reduce, compressor saturation degree is excessive, thus in different modes, the corresponding pressure at expulsion of heating mode
Also in abnormal ranges, the corresponding pressure of inspiration(Pi) of refrigeration mode is also in abnormal ranges.Therefore, by judge superhigh temperature heating and it is ultralow
Temperature refrigeration, above three Rule of judgment are indispensable., in cooling or heating mode, and when meeting above-mentioned part, auxiliary electricity
Sub- expansion valve is opened, by the flow of electronic expansion valve controls auxiliary branch, refrigerant pressure mistake when preventing superhigh temperature from heating
Height, when super low temperature refrigeration, the problem of indoor unit frequent anti-freeze.
As shown in figure 3, multi-connected machine control method of the invention, specifically comprises the following steps:
Under S11, heating mode, current outdoor environment temperature T is obtained；
S12, as the default environment temperature T of outdoor environment temperature T >=the first1And only open 1 indoor unit and the compression
The pressure at expulsion P of machine1>=the first preset pressure P3When；First default environment temperature T1Range are as follows: 18-22 DEG C, due to outdoor ring
Border temperature is in comfortable state for normal human, but since indoor environment temperature is low, user can open heating
Mode is heated, and in this case, due to only opening 1, leads to the continuous frequency reducing of compressor, saturation pressure is excessive, holds for a long time
It is continuous, it will lead to compressor and be in sub-health state, cause the service life for shortening compressor.More than this first default environment temperature
Range can further bring excessive damage to compressor；Less than this first default ambient temperature range, compressor is in normal
Operating condition.Preferably, the first default environment temperature T1It is 20 DEG C.The most easy air conditioner of outdoor environment under this state is in superelevation
The heating mode of temperature.First preset pressure P3Range are as follows: the pressure at expulsion of 30-40bar, the compressor under this range are in phase
To saturation state, overrun value, and damage will be brought for compressor；Less than this ranges value, compressor is in normal fortune
Turn state.First preset pressure P as a result,3Range so that compressor is in hypersaturated state, prevent compressor from continuing to drop
Frequently, it can not be operated so as to cause compressor.Preferred first preset pressure P3Are as follows: 35bar, compressor are in a saturated state.
S13, the control auxiliary electron expansion valve are opened.As a result, under heating mode, compressor excess load is transported in order to prevent
Turn, and then auxiliary electron expansion valve is opened.
S14, current high pressure saturation temperature is obtained, according to current high pressure saturation temperature and the first temperature sensing package temperature T3The temperature difference
It is worth the size of range, controls the aperture of auxiliary electron expansion valve.Due under superhigh temperature heating mode, the instability of flow of refrigerant,
Therefore pass through the corresponding temperature of exhaust port pressure (high pressure saturation temperature), the first temperature sensing package temperature T3Judged, auxiliary electron is swollen
The aperture of swollen valve.To make compressor be in normal operation, compressor service life is improved.
S141, as high pressure saturation temperature the-the first temperature sensing package temperature T3The first preset temperature of >, then the auxiliary electron expansion
Valve opening+M step；Since cold medium flux is very little, therefore electron assistant valve is controlled, increases the opening value of its electronic expansion valve opening.
S142, as the second preset temperature≤high pressure saturation temperature the-the first temperature sensing package temperature T3When the≤the first preset temperature, institute
Auxiliary electron expansion valve opening is stated to remain unchanged；Coolant quantity under current state is in normal, therefore auxiliary electron expansion valve is opened
Degree remains unchanged.
S143, as high pressure saturation temperature the-the first temperature sensing package temperature T3When the second preset temperature of <, the auxiliary electron expansion
Valve opening-N step.Since cold medium flux is too many, therefore electron assistant valve is controlled, reduces the opening value of its electronic expansion valve opening.
First preset temperature and the second preset temperature range set purpose and are, the cold medium flux under the conditions of this preset temperature
It is insufficient or excessive, and then control the aperture control of auxiliary electron expansion valve.First preset temperature range are as follows: 6-8 DEG C；This value range
The first preset temperature, be that determining cold medium flux within the scope of this is very few, numerical value is herein below the first preset temperature, it is possible to cold
Matchmaker's flow is normal or too many.Preferably, 7 DEG C of the first preset temperature accurately determines the cold medium flux under this first preset temperature.
Second preset temperature range are as follows: 4-5 DEG C；Second preset temperature of this value range is determining refrigerant within the scope of this
Flow is excessive, and numerical value is herein more than second preset temperature, it is possible to which cold medium flux is normal or very few.Preferably, the second default temperature
5 DEG C of degree.Accurately determine the cold medium flux under this second preset temperature.The range of M are as follows: 3-4 step, the auxiliary electron within the scope of this
Expansion valve+3-4 step, makes its cold medium flux tend to be normal.Preferably, 3 M, auxiliary electron expansion valve increase by 3 steps, can be more preferable
So that compressor is in normal operation.The range of N are as follows: 5-6 step, the auxiliary electron expansion valve -5-6 step within the scope of this make
Its cold medium flux tends to be normal.Preferably, 5 N, auxiliary electron expansion valve reduce by 3 steps, and compressor can preferably be made to be in just
Normal operating condition.
Therefore, when machine in 1P is singly opened in high temperature heating, condensing pressure is reduced, runs compressor in safe range.
As shown in figure 4, obtaining current outdoor environment temperature T under S21, refrigeration mode；
S22, as the default environment temperature T of outdoor environment temperature≤the first1And when only opening 1 indoor unit, continue to obtain
The pressure of inspiration(Pi) P of presently described compressor2≤ the second preset pressure P4When；Due to outdoor environment temperature relative to normal human and
Speech is in comfortable state, but since indoor environment temperature is excessively high, user can open refrigeration mode and freeze, such case
Under, due to only opening 1 indoor unit, when low windscreen is run, even if compressor minimizes frequency, frequent anti-freeze is caused to be protected,
Cause system unstable.The first default environment temperature T1Range are as follows: 18-22 DEG C, the first default environment temperature model herein
It encloses, excessive damage can be further brought to compressor；Preferably, the first default environment temperature T1It is 20 DEG C.Under this state
The most easy air conditioner of outdoor environment is in the refrigeration mode of ultralow temperature.
Second preset pressure P4Range are as follows: the pressure of inspiration(Pi) of 6-8bar, the compressor under this range are in relative saturation
State, overrun value, causes to frequently occur anti-freeze protection.Preferably, the second preset pressure P4Are as follows: 7bar, at compressor
In saturation state.
S23, the auxiliary electron expansion valve unlatching is then controlled.When super low temperature refrigeration is run, the anti-frequent anti-freeze of locking system
Protection, causes system unstable, therefore opens auxiliary electron expansion valve and be adjusted system, stablizes system, improves relaxing for user
Appropriateness.
S24, current low pressure saturation temperature is obtained, according to current low pressure saturation temperature and the second temperature sensing package temperature T4The temperature difference
It is worth the size of range, controls the aperture of auxiliary electron expansion valve.According to current low pressure saturation temperature and when the second temperature sensing package temperature
T4Temperature difference range size, control auxiliary electron expansion valve aperture.Due under super low temperature refrigeration mode, the flow of refrigerant
It is unstable, therefore pass through the corresponding temperature of air entry pressure (low pressure saturation temperature), the second temperature sensing package temperature T4Judged, is assisted
The aperture of electric expansion valve.To make system be in normal operation, the comfort level of user is improved.
S241, as the second temperature sensing package temperature T4When low pressure saturation temperature > third preset temperature, the auxiliary electron expansion
Valve opening+Q step.Since cold medium flux is very little, therefore electron assistant valve is controlled, increases the opening value of its electronic expansion valve opening.
S242, as the 4th preset temperature≤second temperature sensing package temperature T4When low pressure saturation temperature≤third preset temperature, institute
Auxiliary electron expansion valve opening is stated to remain unchanged.Coolant quantity under current state is in normal, therefore auxiliary electron expansion valve is opened
Degree remains unchanged.
S243, as the second temperature sensing package temperature T4When low pressure saturation temperature four preset temperature of <, the auxiliary electron expansion
Valve opening-P step.Since cold medium flux is too many, therefore electron assistant valve is controlled, reduces the opening value of its electronic expansion valve opening.
Third preset temperature and the 4th preset temperature range set purpose and are, the cold medium flux under the conditions of this preset temperature
It is insufficient or excessive, and then control the aperture control of auxiliary electron expansion valve.First preset temperature range are as follows: 4-5 DEG C；This value range
Third preset temperature, be that determining cold medium flux within the scope of this is very few, numerical value is below this third preset temperature, it is possible to cold
Matchmaker's flow is normal or too many.Preferably, 5 DEG C of the first preset temperature accurately determines the cold medium flux under this third preset temperature.
4th preset temperature range are as follows: 2-3 DEG C；4th preset temperature of this value range is determining refrigerant within the scope of this
Flow is excessive, and numerical value is herein more than 4th preset temperature, it is possible to which cold medium flux is normal or very few.Preferably, the 4th default temperature
3 DEG C of degree.Accurately determine the cold medium flux under this 4th preset temperature.The range of M are as follows: 3-4 step, the auxiliary electron within the scope of this
Expansion valve+3-4 step, makes its cold medium flux tend to be normal.Preferably, 3 M, auxiliary electron expansion valve increase by 3 steps, can be more preferable
So that compressor is in normal operation.The range of N are as follows: 5-6 step, the auxiliary electron expansion valve -5-6 step within the scope of this make
Its cold medium flux tends to be normal.Preferably, 5 N, auxiliary electron expansion valve reduce by 3 steps, and compressor can preferably be made to be in just
Normal operating condition.
When cryogenic refrigeration list opens machine in 1P as a result, evaporating pressure is promoted, makes system stable operation, improves the comfortable of user
Degree, and then improve the satisfaction of user.
As shown in figure 5, S31, in a heating mode, primary every the detection of the first preset time；First preset time are as follows:
25-40min can make in this first preset time range the bottom of outdoor heat exchanger generate defrost；Preferably, first it is default when
Between are as follows: 30min, corresponding first preset time more can accurately judge, under this condition be enough to reach in exchanger base
The condition of frosting, icing.
S32, as the default environment temperature of outdoor environment temperature≤the second and defrost temperature sensing package temperature≤outdoor environment temperature-A
DEG C when；The range of the A are as follows: 3-5, the second default environment temperature are as follows: 1-3 DEG C；Purpose is generating knot under this condition
Frost before freezing, introduces high temperature refrigerant in advance and heats outdoor heat exchanger in advance, prevent the frosting of outdoor heat exchanger bottom, freeze.It is preferred that
, A are as follows: 5；Second default environment temperature are as follows: 3 DEG C.U the pipe easily icing, frosting of outdoor heat exchanger under this condition as a result,.
S33, auxiliary electron expansion valve are opened into R step；
S34, it is closed after maintaining the second preset time.
The range of R are as follows: 90-110；Second preset time are as follows: 50-70s.It heats outdoor heat exchanger bottom in advance as a result, adds
Fast defrost；Control auxiliary electron expansion valve step number and duration under this condition is enough the bottom defrost of heat exchanger is complete
At.It is preferred: R are as follows: 100；Second preset time are as follows: 60s.The unlatching step number of present invention auxiliary electron expansion valve described above
And the duration is optimal selection, the present invention is directed to the unlatching step number of auxiliary electron expansion valve and the duration does not do
It limits, exchanger base defrost can be completed, avoid frosting, icing.Control method of the present invention, can be not
With under operational mode, by controlling the control of auxiliary electron expansion valve, the system of its air conditioner is subjected to stable operation, improves and uses
The comfort level at family.
The present invention also provides a kind of air conditioners including above-mentioned multi-connected unit control system further includes,
Detection unit, the detection unit is for detecting current outdoor environment temperature and the corresponding pressure at expulsion of compressor
And pressure of inspiration(Pi)；It is also used to detect the high pressure saturation pressure under heating mode, the low pressure saturation pressure under refrigeration mode.
Computing unit, the computing unit is for calculating whether the current outdoor environment temperature reaches default outdoor environment
Temperature；
The computing unit is also used to calculate the corresponding pressure at expulsion of the compressor or whether pressure of inspiration(Pi) reaches default
Pressure specifically includes:
Under heating mode, current outdoor environment temperature T is obtained, when the default environment temperature of outdoor environment temperature T >=the first
Spend T1And only open the pressure at expulsion P of 1 indoor unit and the compressor1>=the first preset pressure P3When.
Under refrigeration mode, current outdoor environment temperature T is obtained, when the default environment temperature of outdoor environment temperature≤the first
T1And when only opening 1 indoor unit, continue the pressure of inspiration(Pi) P for obtaining presently described compressor2≤ the second preset pressure P4。
Control unit, described control unit are used to control the aperture of the auxiliary electron expansion valve, specifically include: heating mould
Under formula, as high pressure saturation temperature the-the first temperature sensing package temperature T3The first preset temperature of >, then the auxiliary electron expansion valve opening+M
Step；As the second preset temperature≤high pressure saturation temperature the-the first temperature sensing package temperature T3When the≤the first preset temperature, the auxiliary electron
Expansion valve opening remains unchanged；As high pressure saturation temperature the-the first temperature sensing package temperature T3When the second preset temperature of <, the auxiliary electricity
Sub- expansion valve opening-N step.
Under refrigeration mode, as the second temperature sensing package temperature T4When low pressure saturation temperature > third preset temperature, the auxiliary electricity
Sub- expansion valve opening+Q step；As the 4th preset temperature≤second temperature sensing package temperature T4Low pressure saturation temperature≤third preset temperature
When, the auxiliary electron expansion valve opening remains unchanged；As the second temperature sensing package temperature T4The default temperature of low pressure saturation temperature < the 4th
When spending, the auxiliary electron expansion valve opening-P step.
When the default environment temperature of outdoor environment temperature≤the second and defrost temperature sensing package temperature≤- A DEG C of outdoor environment temperature,
The auxiliary electron expansion valve is opened into R step, closes after maintaining the second preset time.
Defrost temperature sensing package is equipped with defrost temperature sensing package, the defrost temperature sensing package of all existing air conditioners at present in air conditioner
It can be realized effect of the invention.
The beneficial effect of air conditioner described in the present embodiment is identical as the above-mentioned beneficial effect of multi-connected machine control method, In
This is no longer elaborated.
A kind of air conditioner, computer readable storage medium and processor including being stored with computer program, the calculating
When machine program is read and run by the processor, multi-connected machine control method described above is realized.The air conditioner of the present embodiment
Beneficial effect it is identical as the above-mentioned beneficial effect of multi-connected machine control method, no longer elaborate herein.
Although present disclosure is as above, present invention is not limited to this.Anyone skilled in the art are not departing from this
It in the spirit and scope of invention, can make various changes or modifications, therefore protection scope of the present invention should be with claim institute
Subject to the range of restriction.
Claims (11)
1. a kind of multi-connected unit control system, including more indoor units and an outdoor unit, which is characterized in that the outdoor unit packet
It includes an auxiliary branch (3), one end of the auxiliary branch (3) is connect with the liquid pipe of the multiple indoor unit, the auxiliary branch
(3) the other end is connect with the tracheae of the multiple indoor unit, is provided with auxiliary electron expansion valve on the auxiliary branch (3)
(32), the side U pipe of the auxiliary electron expansion valve (32) is provided with the first temperature sensing package (33), far from the auxiliary electron
The side U pipe of expansion valve (32) is provided with the second temperature sensing package (34).
2. a kind of multi-connected machine control method, which is characterized in that it is realized by the multi-connected unit control system of claim 1, it is described more
On-line control method includes:
Current outdoor environment temperature T and booting indoor unit number of units are obtained, judges that the outdoor environment temperature T and the booting are indoor
Whether board number meets preset condition；
If satisfied, then obtaining the pressure at expulsion and/or pressure of inspiration(Pi) of unit current compressor；
By judging the pressure at expulsion and/or pressure of inspiration(Pi), opening or closing for the auxiliary electron expansion valve is controlled.
3. multi-connected machine control method as claimed in claim 2, which is characterized in that
Under heating mode, the current outdoor environment temperature T is obtained, when the default ring of current outdoor environment temperature T >=the first
Border temperature T1, only open the pressure at expulsion P of 1 indoor unit and the compressor1>=the first preset pressure P3When, control the auxiliary
Electric expansion valve is opened.
4. multi-connected machine control method as claimed in claim 3, which is characterized in that the control auxiliary electron expansion valve is opened
It starts and includes: suddenly
Obtain current high pressure saturation temperature；
As high pressure saturation temperature the-the first temperature sensing package temperature T3The first preset temperature of >, then the auxiliary electron expansion valve opening+M
Step；
As the second preset temperature≤high pressure saturation temperature the-the first temperature sensing package temperature T3When the≤the first preset temperature, the auxiliary electron
Expansion valve opening remains unchanged；
As high pressure saturation temperature the-the first temperature sensing package temperature T3When the second preset temperature of <, the auxiliary electron expansion valve opening-N
Step.
5. multi-connected machine control method as claimed in claim 3, which is characterized in that the first preset pressure P3Range be 30-
40bar。
6. multi-connected machine control method as claimed in claim 4, which is characterized in that first preset temperature range is 6-8 DEG C.
7. multi-connected machine control method as claimed in claim 4, which is characterized in that second preset temperature range is 4-5 DEG C.
8. multi-connected machine control method as claimed in claim 2, which is characterized in that
Under refrigeration mode, the current outdoor environment temperature T is obtained, when the default environment of current outdoor environment temperature≤the first
Temperature T1, only open the pressure of inspiration(Pi) P of 1 indoor unit and the compressor2≤ the second preset pressure P4When, then control the auxiliary
Electric expansion valve is opened.
9. multi-connected machine control method as claimed in claim 8, which is characterized in that the control auxiliary electron expansion valve is opened
It starts and includes: suddenly
As the second temperature sensing package temperature T4When low pressure saturation temperature > third preset temperature, the auxiliary electron expansion valve opening+Q
Step；
As the 4th preset temperature≤second temperature sensing package temperature T4When low pressure saturation temperature≤third preset temperature, the auxiliary electron
Expansion valve opening remains unchanged；
As the second temperature sensing package temperature T4When low pressure saturation temperature four preset temperature of <, the auxiliary electron expansion valve opening-P
Step.
10. multi-connected machine control method as claimed in claim 2, which is characterized in that the multi-connected machine control method further include:
In a heating mode, primary every the detection of the first preset time；
It is described when the default environment temperature of outdoor environment temperature≤the second and defrost temperature sensing package temperature≤- A DEG C of outdoor environment temperature
Auxiliary electron expansion valve is opened into R step, closes after maintaining the second preset time.
11. a kind of air conditioner, which is characterized in that computer readable storage medium and processing including being stored with computer program
Device when the computer program is read and run by the processor, realizes such as the described in any item methods of claim 2-10.
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Application publication date: 20191203 |