CN109405101A - A kind of double wind path Central air-conditioning units and its control method - Google Patents
A kind of double wind path Central air-conditioning units and its control method Download PDFInfo
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- CN109405101A CN109405101A CN201811314573.6A CN201811314573A CN109405101A CN 109405101 A CN109405101 A CN 109405101A CN 201811314573 A CN201811314573 A CN 201811314573A CN 109405101 A CN109405101 A CN 109405101A
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000004378 air conditioning Methods 0.000 title claims abstract description 26
- 238000005057 refrigeration Methods 0.000 claims abstract description 70
- 230000008676 import Effects 0.000 claims abstract description 16
- 238000001704 evaporation Methods 0.000 claims description 32
- 239000007788 liquid Substances 0.000 claims description 11
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000010009 beating Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 238000010257 thawing Methods 0.000 description 10
- 239000003507 refrigerant Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
-
- 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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
-
- 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
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
-
- 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
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The present invention provides a kind of double wind path Central air-conditioning units, including A wind path air hose, B wind path air hose, several refrigeration systems, differential pressure pickup, blower, import blast main, outlet blast main, the first air-valve and the second air-valve；Each refrigeration system is provided with first evaporator, second evaporator and the first solenoid valve, second solenoid valve.Also provide a kind of control method, comprising the following steps: control parameter is arranged in A.；B. it works according to the road A refrigerating state；When C. meeting the road A and turning the road B switching condition, the road B refrigerating state is switched to by the road A refrigerating state；When D. meeting the road B and turning the road A switching condition, the road A refrigerating state is switched to by the road B refrigerating state.The unit and its control method, which can either be realized, to be stablized and continuous ultralow temperature air-supply, and can be avoided the frequent switching between air duct, and reliability is higher.
Description
Technical field
The present invention relates to technical field of central air, in particular to a kind of double wind path Central air-conditioning units and its controlling party
Method.
Background technique
In some special applications, needs to use all-fresh air and ultralow temperature is blown to meet certain technique requirement,
Such application places are required regardless of outdoor fresh air environment temperature, are required to supply air temperature between some subzero range,
In require to be common, -5 DEG C~-10 DEG C degree air-supply requirements of part site requirements with -5 DEG C~0 DEG C air-supply, it is so low if you need to meet
The supply air temperature of temperature is unable to reach requirement using conventional level-one refrigeration system, need to use the concatenated mode of multistage refrigerating plant
It realizes that the cryogenic refrigeration to supply air temperature is handled, and in processed air is usually water content, Central air-conditioning unit low temperature
In refrigeration process, once refrigeration system evaporating temperature is lower than 0 DEG C, the moisture content in air will be tied when passing through the evaporator
Ice, the icing of formation can increase air by the resistance of the evaporator, and air quantity is even resulted in when ice blocks up serious can not be normally through
All evaporators and reach air outlet, no matter which kind of situation, will lead to air duct internal drag increased dramatically, such as locate not in time
Reason, will lead to pressure fan overload-alarm, compressor emergency shutdown is unable to run.
The prior art realizes that ultralow temperature is sent in the processing of such air-conditioning, by using the concatenated mode of multistage refrigerating plant
Wind, although using relatively independent double air path systems and relatively independent refrigeration system, realizes two in the processing of wind path
The using and the reserved of wind path and two refrigeration system accesses control, to maintain prolonged ultralow temperature air-supply to require, but at two
In wind path the using and the reserved control processing, the prior art generallys use the switching that single parameter such as pressure difference carries out two wind paths, is having
Control logic is too simple in body switching control, generally use when unit pressure difference be higher than some pressure difference be switched to from current wind path it is standby
With wind path, while carrying out according to this condition the switching of refrigeration access.This switch mode does not fully consider two wind path switchings
In the process, the higher influence (leaving air temp has of short duration raising) to leaving air temp of (1) new wind path evaporating temperature, (2) quilt
The stifled evaporator of ice switched in air duct is slow (this problem is more prominent when outdoor environment temperature is low) by natural heat-exchange defrosting process.
(3) the evaporator defrosting for often occurring being switched in air duct, which is not thorough, will be switched to operation air duct, cause between air duct
Switching is more and more frequent with the extension of unit runing time.Its drawback finally embodies are as follows: (1) leaving air temp can not be stablized.(2)
Frequent switching between air duct causes each electrically operated valve service life seriously to be lost, and unit reliability reduces.
And in super low temperature refrigeration supply air system, the evaporating temperature of partial vaporiser is normality lower than 0 degree.In order to both realize
Stablize and continuous ultralow temperature air-supply, and avoid the frequent switching between air duct, the reliability of air-conditioner set is improved, at this Shen
The Important Problems that please be solve.
Summary of the invention
Place in view of above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a kind of double wind path Central air-conditioning units
And its control method, it can either realize and stablize and continuous ultralow temperature air-supply, and can be avoided the frequent switching between air duct, it can
It is higher by property.
In order to achieve the above object, this invention takes following technical schemes:
A kind of double wind path Central air-conditioning units, including A wind path air hose, B wind path air hose, several refrigeration systems, differential pressure pickup
And blower；A wind path air hose and B wind path air hose are connected in parallel between an import blast main and an outlet blast main, into
Mouth blast main is connected to outdoor, and outlet blast main is connected to air-supply desired region；Each refrigeration system is provided with one first evaporation
Device and second evaporator, and it is provided with the first solenoid valve for being respectively used to the first evaporator of control and the opening and closing of the second evaporator
And second solenoid valve；All first evaporators are arranged in A wind path air hose and set along the length direction interval of A wind path air hose
It sets, all second evaporators are arranged in B wind path air hose and are arranged along the length direction interval of B wind path air hose；Blower setting
In outlet blast main, differential pressure pickup is used to detect import blast main and exports the differential pressure of atmospheric pressure between blast main；Near
The first air-valve and the second air-valve are respectively arranged on the first evaporator and the second evaporator of import blast main.
In double wind path Central air-conditioning units, the refrigeration system further include sequentially connected evaporating pressure switch,
Compressor, condenser, and the condensation fan at condenser is set；First evaporator and the second evaporator are connected in parallel
Between condensator outlet and evaporating pressure switch entrance, the first solenoid valve and second solenoid valve are separately positioned on the first evaporator
The inlet of inlet and the second evaporator.
In double wind path Central air-conditioning units, the refrigeration system further includes setting in evaporating pressure switch inlet
Gas-liquid separator, be arranged in evaporating pressure switch compressor between low-voltage protective switch, be successively set on compressor and
High voltage protective switch and oil-liquid separator between condenser, and the liquid storage device at condensator outlet is set.
In double wind path Central air-conditioning units, the import blast main, outlet blast main, each first evaporator
The wind outlet of wind outlet and each second evaporator is provided with temperature sensor.
A kind of control method of double wind path Central air-conditioning units, comprising the following steps:
A., control parameter for controlling the road A refrigerating state and the switching of the road B refrigerating state is set in a control program；
B. unit first powers on, and double wind path Central air-conditioning units carry out refrigeration work according to the road A refrigerating state；
C. the duration is transfinited using the road A refrigerating state accumulated running time, unit both ends pressure difference, pressure difference to be judged,
When they, which meet the road A, turns the road B switching condition, the road B refrigerating state is switched to by the road A refrigerating state；
D. the duration is transfinited using the road B refrigerating state accumulated running time, unit both ends pressure difference, pressure difference to be judged,
When they, which meet the road B, turns the road A switching condition, the road A refrigerating state is switched to by the road B refrigerating state.
In the control method, the control parameter includes access minimum runing time, access maximum runing time, pressure
Poor switching value, High Pressure Difference judge the time, A-B switching mark, B-A switching mark, air flue Status Flag, pressure difference reference value,
Air-valve switching delay time, double air-valves while opening time.
In the step C of the control method, meeting one of following two condition is to meet the road A to turn the road B switching condition:
1. access maximum runing time of the condition > road A refrigerating state accumulated running time > access minimum runing time and unit two
Side pressure difference >=pressure difference switching value and pressure difference transfinite the duration > and High Pressure Difference judges the time；
2. road A refrigerating state accumulated running time of condition >=access maximum runing time.
In the step C of the control method, the process that the road A refrigerating state switches to the road B refrigerating state includes carrying out A-B
Wind path switching and progress A-B refrigeration access switching, two switch operatings carry out simultaneously；
Wherein, A-B wind path switching comprising steps of
If C1. unit both ends pressure difference >=pressure difference switching value, the first air-valve is first kept to open, the second air-valve is cut by the air-valve
It changes delay time delay to open, then by double air-valves, the opening time keeps beating while the first air-valve and the second air-valve simultaneously
Hereafter open state closes the first air-valve when unit both ends pressure difference, which meets, closes valve condition, and the second air-valve is kept to open；
If C2. pressure difference switching value-pressure difference reference value <unit both ends pressure difference < pressure difference switching value, opens the second air-valve, then
By opening state while double air-valves while opening time the first air-valve of holding and the second air-valve, hereafter, when unit both ends
Pressure difference, which meets, closes the first air-valve when closing valve condition, and the second air-valve is kept to open；
If C3. unit both ends pressure difference≤pressure difference switching value-pressure difference reference value, the is closed while directly opening the second air-valve
One air-valve；
Wherein, A-B freeze access switching comprising steps of
If C4. refrigeration system is currently running and its evaporating pressure switch disconnects, its first solenoid valve and second solenoid valve are closed；
If C5. refrigeration system is currently running and its evaporating pressure closes the switch, its first solenoid valve is closed, opens its second electricity
Magnet valve.
In the step D of the control method, meeting one of following two condition is to meet the road B to turn the road A switching condition:
3. access maximum runing time of the condition > road B refrigerating state accumulated running time > access minimum runing time and unit two
Side pressure difference >=pressure difference switching value and pressure difference transfinite the duration > and High Pressure Difference judges the time；
4. road B refrigerating state accumulated running time of condition >=access maximum runing time.
In the step D of the control method, the process that the road B refrigerating state switches to the road A refrigerating state includes carrying out B-A
Wind path switching and progress B-A refrigeration access switching, two switch operatings carry out simultaneously；
Wherein, B-A wind path switching comprising steps of
If D1. unit both ends pressure difference >=pressure difference switching value, the second air-valve is first kept to open, the first air-valve is cut by the air-valve
It changes delay time delay to open, then by double air-valves, the opening time keeps beating while the first air-valve and the second air-valve simultaneously
Hereafter open state closes the second air-valve when unit both ends pressure difference, which meets, closes valve condition, and the first air-valve is kept to open；
If D2. pressure difference switching value-pressure difference reference value <unit both ends pressure difference < pressure difference switching value, opens the first air-valve, then
By opening state while double air-valves while opening time the first air-valve of holding and the second air-valve, hereafter, when unit both ends
Pressure difference, which meets, closes the second air-valve when closing valve condition, and the first air-valve is kept to open；
If D3. unit both ends pressure difference≤pressure difference switching value-pressure difference reference value, the is closed while directly opening the first air-valve
Two air-valves；
Wherein, B-A freeze access switching comprising steps of
If D4. refrigeration system is currently running and its evaporating pressure switch disconnects, its first solenoid valve and second solenoid valve are closed；
If D5. refrigeration system is currently running and its evaporating pressure closes the switch, its second solenoid valve is closed, opens its first electricity
Magnet valve.
The utility model has the advantages that
The present invention provides a kind of double wind path Central air-conditioning units and its control methods, using two wind paths and two refrigeration systems
The structure of access occurs carrying out wind path when ice blocks up phenomenon or the too long wind path working time in the wind path channel of work at present wind path
Steady switching, be switched access according to ice block up actual conditions carry out selectively defrosting, meanwhile, refrigeration system access is automatically quasi-
Really switch, can effectively avoid influence of the wind path switching to leaving air temp, it is ensured that leaving air temp is stablized, while can avoid interchannel
Frequent switching improves the reliability and stability of unit.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of double wind path Central air-conditioning units provided by the invention.
Fig. 2 is the structural schematic diagram of single refrigeration system in double wind path Central air-conditioning units provided by the invention.
Fig. 3 is the flow chart of control method provided by the invention.
Fig. 4 is in control method provided by the invention, and the road A refrigerating state switches to the process flow diagram flow chart of the road B refrigerating state.
Fig. 5 is in control method provided by the invention, and the road B refrigerating state switches to the process flow diagram flow chart of the road A refrigerating state.
Specific embodiment
The present invention provides a kind of double wind path Central air-conditioning units and its control method, to make the purpose of the present invention, technical side
Case and effect are clearer, clear, and the present invention is described in more detail as follows in conjunction with drawings and embodiments.It should be appreciated that
Described herein specific examples are only used to explain the present invention, is not intended to limit the present invention.
A kind of double wind path Central air-conditioning units provided by the invention referring to FIG. 1-2, including A wind path air hose 1, B wind path wind
Pipe 2, several refrigeration systems 3, differential pressure pickup 4 and blower 5；A wind path air hose and B wind path air hose be connected in parallel in one into
Between mouth blast main 6 and an outlet blast main 7, import blast main is connected to outdoor, and outlet blast main is connected to air-supply demand
Area；Each refrigeration system 3 is provided with first evaporator 3.1 and second evaporator 3.2, and is provided with and is respectively used to control
Make the first solenoid valve 3.3 and second solenoid valve 3.4 of the first evaporator and the opening and closing of the second evaporator；All first evaporators 3.1
It is arranged in A wind path air hose 1 and is arranged along the length direction interval of A wind path air hose, all second evaporators 3.2 are arranged at
It is arranged in B wind path air hose 2 and along the length direction interval of B wind path air hose；The setting of blower 5 is in outlet blast main 7, pressure difference sensing
Device 4 is used to detect import blast main and exports the differential pressure of atmospheric pressure between blast main；Near the first evaporator of import blast main
With the first air-valve 8 and the second air-valve 9 are respectively arranged on the second evaporator.
Wherein, pressure tappings are offered on import blast main 6 and outlet blast main 7, differential pressure pickup 4 is adopted by pressure tappings
Collect the barometric information at two.As common knowledge, which has control system, each in unit
Electrical equipment is electrically connected with the control system and controls them by control system and works.Since the unit is to apply needing
The environment blown using all-fresh air and ultralow temperature, so it is to be connected to send that import blast main 6, which is connected to outdoor, outlet blast main 7,
Wind desired region.Although depicting in Fig. 1 has the case where 3 refrigeration systems, refrigeration system is not limited to 3, can basis
One or more are arranged in actual needs.
Specifically, the refrigeration system 3 further includes sequentially connected evaporating pressure switch 3.5, compressor 3.6, condenser
3.7, and the condensation fan 3.8 at condenser is set；First evaporator 3.1 and the second evaporator 3.2 are connected in parallel
Between condensator outlet and evaporating pressure switch entrance, the first solenoid valve 3.3 and second solenoid valve 3.4 are separately positioned on first
At the evaporator inlet and inlet of the second evaporator.Benefit may be implemented by the first solenoid valve of control and second solenoid valve opening and closing
With the first evaporator refrigeration and utilize the switching of the second evaporator refrigeration.
Further, the refrigeration system 3 further includes the gas-liquid separator that 3.5 inlet of evaporating pressure switch is arranged in
3.9, the low-voltage protective switch 3.10 between evaporating pressure switch and compressor 3.6 is set, compressor and cold is successively set on
High voltage protective switch 3.11 and gas-liquid separator 3.12 between condenser 3.7, and the liquid storage device at condensator outlet is set
3.13.These equipment are set, compressor can be protected, keep compressor operating more steady, guarantee refrigeration effect.
Preferably, the import blast main 6, outlet blast main 7, the wind outlet of each first evaporator 3.1 and each
The wind outlet of second evaporator 3.2 is provided with temperature sensor 10.Pass through the practical temperature of these temperature sensors acquisition everywhere
Degree can adjust the control parameter of control unit work according to temperature variations everywhere, realize optimum control.
See Fig. 3-5, the present invention also provides the control methods of double wind path Central air-conditioning units described in one kind, including following step
It is rapid:
A., control parameter for controlling the road A refrigerating state and the switching of the road B refrigerating state is set in a control program.
Specifically, the control parameter includes access minimum running time T min, access maximum running time T max, pressure difference
Switching value P0, High Pressure Difference judge time Tg, A-B switching mark M0, B-A switching mark M1, air flue Status Flag M2, pressure difference
Reference value P1, air-valve switching delay time T0, double air-valves while opening time T1.
Access minimum running time T min: only access, which currently accumulates, just will do it access when runing time is more than Tmin and cuts
It changes.
Access maximum running time T max: access, which currently accumulates when runing time reaches Tmax, must carry out access switching.
Pressure difference switching value P0:(differential pressure pickup detects) pressure difference P >=P0, it is serious to indicate that access ice blocks up degree.
High Pressure Difference judges time Tg: for being more than the reference value compared the duration of P0, the duration with pressure difference P
Show that the serious ice of access is stifled more than Tg.
When pressure difference reference value P1:P0 > pressure difference P > P0-P1, it is general for indicating that access ice blocks up degree;Pressure difference P≤P0-
When P1, it is small to indicate that access ice blocks up degree.
A-B switching mark M0:M0 only has M0=0 and the two states of M0=1, freezes when switching to the road B into the road A refrigerating state
The process of state, M0 is set as 1 automatically by control program, and at the end of the handoff procedure, M0 is set as 0 automatically by control program；
That is M0=1 indicates in A-B switching that M0=0 indicates A-B finishing switching.
B-A switching mark M1:M1 only has M1=0 and the two states of M1=1, freezes when switching to the road A into the road B refrigerating state
The process of state, M1 is set as 1 automatically by control program, and at the end of the handoff procedure, M1 is set as 0 automatically by control program；
That is M1=1 indicates in B-A switching that M0=0 indicates B-A finishing switching.
Air flue Status Flag M2:M2 only has M2=0 and the two states of M2=1, and access is freezed by the first evaporator 3.1
M2 is set as 0 automatically by time control processing procedure sequence, and M2 is set as 1 automatically by the second evaporator 3.2 refrigeration time control processing procedure sequence by access.
Air-valve switching delay time T0: rising into handoff procedure, the air-valve of current pass continue to individually to open when
Between.
Double air-valves while opening time T1: in handoff procedure, two air-valves are in the duration for the state that opens simultaneously.
B. when unit first powers on, double wind path Central air-conditioning units carry out refrigeration work according to the road A refrigerating state.
At this point, the first air-valve is opened, the second air-valve is closed, the first solenoid valve opening, second solenoid valve in each refrigeration system
It closes.And air flue Status Flag M2 is set as 0 automatically by control program.
C. using the road A refrigerating state accumulated running time Ta, unit both ends pressure difference P, pressure difference transfinite duration T c come
Judged, when they, which meet the road A, turns the road B switching condition, the road B refrigerating state is switched to by the road A refrigerating state.
Specifically, meeting one of following two condition is to meet the road A to turn the road B switching condition:
1. road access maximum running time T max > A refrigerating state accumulated running time Ta of condition > access minimum runing time
Tmin and unit both ends pressure difference P >=pressure difference switching value P0 and pressure difference the duration T c > High Pressure Difference that transfinites judge time Tg；
Condition 2. road A refrigerating state accumulated running time Ta >=access maximum running time T max.
It when the condition that meets 1 or condition 2, controls program and A-B switching mark M0 is set as 1 automatically, indicate entry into the road A refrigeration
State switches to the handoff procedure (abbreviation A-B handoff procedure) of the road B refrigerating state.
The process that the road A refrigerating state switches to the road B refrigerating state includes that progress A-B wind path switching and progress A-B refrigeration are logical
Road switching, two switch operatings carry out simultaneously.
Wherein, see Fig. 4, the switching of A-B wind path comprising steps of
If C1. it is serious to indicate that access ice blocks up degree by unit both ends pressure difference P >=pressure difference switching value P0(), first keep the first air-valve
It opens, the second air-valve is opened by air-valve switching delay time T0 delay and (i.e. since M0=1, opens second again after T0
Air-valve), it is then (i.e. same by opening state while double air-valves while opening time T1 the first air-valve of holding and the second air-valve
When opening state hold time as T1), hereafter, close the first air-valve when unit both ends pressure difference, which meets, closes valve condition, and
The second air-valve is kept to open.
The purpose of step C1, which is to make full use of, blocks up the waste cold of access by ice to freeze, while utilizing normal temperature air (system
Cold access switches over simultaneously, and the first evaporator no longer works at this time) defrosting is carried out to each evaporator for being blocked up access by ice, reach
Rapid frost melting and maintenance leaving air temp fluctuate little effect.
The pass valve condition specifically: unit both ends pressure difference P < pressure difference switching value P0- pressure difference reference value P1 is hereinafter mentioned
The pass valve condition arrived is identical as pass valve condition herein.
If C2. pressure difference switching value P0- pressure difference reference value P1 <unit both ends pressure difference P < pressure difference switching value P0(indicates access
It is general that ice blocks up degree), then the second air-valve is opened, then opening time T1 keeps the first air-valve and second simultaneously by double air-valves
Hereafter opening state while air-valve closes the first air-valve when unit both ends pressure difference, which meets, closes valve condition, and keep second
Air-valve is opened.
The purpose of this step C2 is that continuing to block up ice access using normal temperature air carries out defrosting, and the access that freezes at this time is completed
Switching, may be implemented the refrigeration to air, it is ensured that leaving air temp is stablized.
If C3. it is small to indicate that access ice blocks up degree by unit both ends pressure difference P≤pressure difference switching value P0- pressure difference reference value P1(),
The first air-valve is closed while then directly opening the second air-valve.
The purpose of this step C3 be to ensure that by ice block up access defrosting be basically completed and ensure switch after gallery pressure it is normal
It just determines and completes switching.Avoid the problem that frequently toggling between channel.
While closing the first air-valve, A-B switching mark M0 is set as 0 automatically by control program, indicates that A-B has switched
At.
Wherein, A-B freeze access switching comprising steps of
If C4. refrigeration system is currently running and its evaporating pressure switch disconnects, its first solenoid valve and second solenoid valve are closed.
Step C4 is to guarantee that switching is steamed in order to which the refrigerant in evaporator is all extracted and deposits in liquid storage device
The amount of the refrigerant flowed after hair device will not be very few, it is ensured that the evaporating pressure of refrigeration system is normal.
If C5. refrigeration system is currently running and its evaporating pressure closes the switch, close its first solenoid valve, open its
Two solenoid valves.At this point, air flue Status Flag M2 is set as 1 automatically by control program.
When evaporating pressure closes the switch, illustrate that refrigerant has been completely drawn out, evaporator can be switched.
A-B switching complete before the course of work in, refrigeration system may disorderly closedown or orderly closedown, control program
In be stored with current refrigeration access storage variable M3, the opening state of the value of the M3 and the first solenoid valve and second solenoid valve
Corresponding, therefore, there are corresponding relationships then to directly initiate when turning back in M2 and M3 correspondence by M2 and M3 under normal circumstances
It is run after refrigeration system according to current state, otherwise needs to switch over after starting refrigeration system according to step C4 and C5.
D. the duration is transfinited using the road B refrigerating state accumulated running time, unit both ends pressure difference, pressure difference to carry out
Judgement, when they, which meet the road B, turns the road A switching condition, switches to the road A refrigerating state by the road B refrigerating state.
Specifically, meeting one of following two condition is to meet the road B to turn the road A switching condition:
3. road access maximum running time T max > B refrigerating state accumulated running time Tb of condition > access minimum runing time
Tmin and unit both ends pressure difference P >=pressure difference switching value P and pressure difference the duration T c > High Pressure Difference that transfinites judge time Tg；
Condition 4. road B refrigerating state accumulated running time Tb >=access maximum running time T max.
It when the condition that meets 3 or condition 4, controls program and B-A switching mark M1 is set as 1 automatically, indicate entry into the road B refrigeration
State switches to the handoff procedure (abbreviation B-A handoff procedure) of the road A refrigerating state.
The process that the road B refrigerating state switches to the road A refrigerating state includes that progress B-A wind path switching and progress B-A refrigeration are logical
Road switching, two switch operatings carry out simultaneously.
Wherein, see Fig. 5, the switching of B-A wind path comprising steps of
If D1. it is serious to indicate that access ice blocks up degree by unit both ends pressure difference P >=pressure difference switching value P0(), first keep the second air-valve
It opens, the first air-valve is opened by air-valve switching delay time T0 delay and (i.e. since M1=1, opens first again after T0
Air-valve), it is then (i.e. same by opening state while double air-valves while opening time T1 the first air-valve of holding and the second air-valve
When opening state hold time as T1), hereafter, close the second air-valve when unit both ends pressure difference, which meets, closes valve condition, and
The first air-valve is kept to open.
The purpose of step D1, which is to make full use of, blocks up the waste cold of access by ice to freeze, while utilizing normal temperature air (system
Cold access switches over simultaneously, and the second evaporator no longer works at this time) defrosting is carried out to each evaporator for being blocked up access by ice, reach
Rapid frost melting and maintenance leaving air temp fluctuate little effect.
If D2. pressure difference switching value P0- pressure difference reference value P0 <unit both ends pressure difference P < pressure difference switching value P0(indicates access
It is general that ice blocks up degree), then the first air-valve is opened, then opening time T1 keeps the first air-valve and second simultaneously by double air-valves
Hereafter opening state while air-valve closes the second air-valve when unit both ends pressure difference, which meets, closes valve condition, and keep first
Air-valve is opened.
The purpose of this step D2 is that continuing to block up ice access using normal temperature air carries out defrosting, and the access that freezes at this time is completed
Switching, may be implemented the refrigeration to air, it is ensured that leaving air temp is stablized.
If D3. it is small to indicate that access ice blocks up degree by unit both ends pressure difference P≤pressure difference switching value P0- pressure difference reference value P1(),
The second air-valve is closed while then directly opening the first air-valve.
The purpose of this step D3 be to ensure that by ice block up access defrosting be basically completed and ensure switch after gallery pressure it is normal
It just determines and completes switching.Avoid the problem that frequently toggling between channel.
While closing the second air-valve, B-A switching mark M1 is set as 0 automatically by control program, indicates that B-A has switched
At.
Wherein, B-A freeze access switching comprising steps of
If D4. refrigeration system is currently running and its evaporating pressure switch disconnects, its first solenoid valve and second solenoid valve are closed.
Step D4 is to guarantee that switching is steamed in order to which the refrigerant in evaporator is all extracted and deposits in liquid storage device
The amount of the refrigerant flowed after hair device will not be very few, it is ensured that the evaporating pressure of refrigeration system is normal.
If D5. refrigeration system is currently running and its evaporating pressure closes the switch, close its second solenoid valve, open its
One solenoid valve.At this point, air flue Status Flag M2 is set as 0 automatically by control program.
When evaporating pressure closes the switch, illustrate that refrigerant has been completely drawn out, evaporator can be switched.
B-A switching complete before the course of work in, refrigeration system may disorderly closedown or orderly closedown, control program
In be stored with current refrigeration access storage variable M3, the opening state of the value of the M3 and the first solenoid valve and second solenoid valve
Corresponding, therefore, there are corresponding relationships then to directly initiate when turning back in M2 and M3 correspondence by M2 and M3 under normal circumstances
It is run after refrigeration system according to current state, otherwise needs to switch over after starting refrigeration system according to step D4 and D5.
In conclusion using the structure of two wind paths and two refrigeration system accesses, it is logical in the wind path of work at present wind path
Road occurs carrying out the steady switching of wind path when ice blocks up phenomenon or the too long wind path working time, and it is stifled practical according to ice to be switched access
Situation carries out selectively defrosting, meanwhile, refrigeration system access automatically and accurately switches, and can effectively avoid wind path switching to outlet air
The influence of temperature, it is ensured that leaving air temp is stablized, while can avoid interchannel frequent switching, improves the reliability and stabilization of unit
Property.
It, can according to the technique and scheme of the present invention and its hair it is understood that for those of ordinary skills
Bright design is subject to equivalent substitution or change, and all these changes or replacement all should belong to protection scope of the present invention.
Claims (10)
1. a kind of double wind path Central air-conditioning units, which is characterized in that including A wind path air hose, B wind path air hose, several refrigeration systems
System, differential pressure pickup and blower；A wind path air hose and B wind path air hose are connected in parallel in an import blast main and an outlet
Between blast main, import blast main is connected to outdoor, and outlet blast main is connected to air-supply desired region；Each refrigeration system is provided with
One the first evaporator and second evaporator, and be provided with and be respectively used to the first evaporator of control and the opening and closing of the second evaporator
The first solenoid valve and second solenoid valve；All first evaporators are arranged in A wind path air hose and along the length of A wind path air hose
The setting of direction interval, all second evaporators are arranged in B wind path air hose and set along the length direction interval of B wind path air hose
It sets；In outlet blast main, differential pressure pickup is used to detect import blast main and exports the air pressure between blast main for blower setting
Pressure difference；The first air-valve and the second air-valve are respectively arranged on the first evaporator and the second evaporator of import blast main.
2. double wind path Central air-conditioning units according to claim 1, which is characterized in that the refrigeration system further includes successively
Evaporating pressure switch, the compressor, condenser of connection, and the condensation fan at condenser is set；First evaporator
And second evaporator be connected in parallel condensator outlet and evaporating pressure switch entrance between, the first solenoid valve and second solenoid valve
It is separately positioned at the first evaporator inlet and the inlet of the second evaporator.
3. double wind path Central air-conditioning units according to claim 2, which is characterized in that the refrigeration system further includes setting
Gas-liquid separator in evaporating pressure switch inlet, the low-voltage variation being arranged between evaporating pressure switch and compressor are opened
It closes, high voltage protective switch and the oil-liquid separator being successively set between compressor and condenser, and setting go out in condenser
Liquid storage device at mouthful.
4. double wind path Central air-conditioning units according to claim 1, which is characterized in that the import blast main, outlet are total
The wind outlet of air hose, the wind outlet of each first evaporator and each second evaporator is provided with temperature sensor.
5. a kind of control method of double wind path Central air-conditioning units according to any one of claims 1-4, which is characterized in that packet
Include following steps:
A., control parameter for controlling the road A refrigerating state and the switching of the road B refrigerating state is set in a control program；
B. unit first powers on, and double wind path Central air-conditioning units carry out refrigeration work according to the road A refrigerating state；
C. the duration is transfinited using the road A refrigerating state accumulated running time, unit both ends pressure difference, pressure difference to be judged,
When they, which meet the road A, turns the road B switching condition, the road B refrigerating state is switched to by the road A refrigerating state；
D. the duration is transfinited using the road B refrigerating state accumulated running time, unit both ends pressure difference, pressure difference to be judged,
When they, which meet the road B, turns the road A switching condition, the road A refrigerating state is switched to by the road B refrigerating state.
6. control method according to claim 5, which is characterized in that when the control parameter includes the operation of access minimum
Between, access maximum runing time, pressure difference switching value, High Pressure Difference judge that time, A-B switching mark, B-A switching mark, air are logical
Line state mark, pressure difference reference value, air-valve switching delay time, double air-valves while opening time.
7. control method according to claim 6, which is characterized in that in step C, meeting one of following two condition is
Meet the road A and turn the road B switching condition:
1. access maximum runing time of the condition > road A refrigerating state accumulated running time > access minimum runing time and unit two
Side pressure difference >=pressure difference switching value and pressure difference transfinite the duration > and High Pressure Difference judges the time；
2. road A refrigerating state accumulated running time of condition >=access maximum runing time.
8. control method according to claim 7, which is characterized in that in step C, the road A refrigerating state switches to the road B refrigeration
The process of state includes carrying out the switching of A-B wind path and carrying out A-B refrigeration access switching, which carries out simultaneously；
Wherein, A-B wind path switching comprising steps of
If C1. unit both ends pressure difference >=pressure difference switching value, the first air-valve is first kept to open, the second air-valve is cut by the air-valve
It changes delay time delay to open, then by double air-valves, the opening time keeps beating while the first air-valve and the second air-valve simultaneously
Hereafter open state closes the first air-valve when unit both ends pressure difference, which meets, closes valve condition, and the second air-valve is kept to open；
If C2. pressure difference switching value-pressure difference reference value <unit both ends pressure difference < pressure difference switching value, opens the second air-valve, then
By opening state while double air-valves while opening time the first air-valve of holding and the second air-valve, hereafter, when unit both ends
Pressure difference, which meets, closes the first air-valve when closing valve condition, and the second air-valve is kept to open；
If C3. unit both ends pressure difference≤pressure difference switching value-pressure difference reference value, the is closed while directly opening the second air-valve
One air-valve；
Wherein, A-B freeze access switching comprising steps of
If C4. refrigeration system is currently running and its evaporating pressure switch disconnects, its first solenoid valve and second solenoid valve are closed；
If C5. refrigeration system is currently running and its evaporating pressure closes the switch, its first solenoid valve is closed, opens its second electricity
Magnet valve.
9. control method according to claim 6, which is characterized in that in step D, meeting one of following two condition is
Meet the road B and turn the road A switching condition:
3. access maximum runing time of the condition > road B refrigerating state accumulated running time > access minimum runing time and unit two
Side pressure difference >=pressure difference switching value and pressure difference transfinite the duration > and High Pressure Difference judges the time；
4. road B refrigerating state accumulated running time of condition >=access maximum runing time.
10. control method according to claim 9, which is characterized in that in step D, the road B refrigerating state switches to A road system
The process of cold state includes carrying out the switching of B-A wind path and carrying out B-A refrigeration access switching, which carries out simultaneously；
Wherein, B-A wind path switching comprising steps of
If D1. unit both ends pressure difference >=pressure difference switching value, the second air-valve is first kept to open, the first air-valve is cut by the air-valve
It changes delay time delay to open, then by double air-valves, the opening time keeps beating while the first air-valve and the second air-valve simultaneously
Hereafter open state closes the second air-valve when unit both ends pressure difference, which meets, closes valve condition, and the first air-valve is kept to open；
If D2. pressure difference switching value-pressure difference reference value <unit both ends pressure difference < pressure difference switching value, opens the first air-valve, then
By opening state while double air-valves while opening time the first air-valve of holding and the second air-valve, hereafter, when unit both ends
Pressure difference, which meets, closes the second air-valve when closing valve condition, and the first air-valve is kept to open；
If D3. unit both ends pressure difference≤pressure difference switching value-pressure difference reference value, the is closed while directly opening the first air-valve
Two air-valves；
Wherein, B-A freeze access switching comprising steps of
If D4. refrigeration system is currently running and its evaporating pressure switch disconnects, its first solenoid valve and second solenoid valve are closed；
If D5. refrigeration system is currently running and its evaporating pressure closes the switch, its second solenoid valve is closed, opens its first electricity
Magnet valve.
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