CN109405324A - A kind of double evaporators air-conditioner set and its control method - Google Patents
A kind of double evaporators air-conditioner set and its control method Download PDFInfo
- Publication number
- CN109405324A CN109405324A CN201811314566.6A CN201811314566A CN109405324A CN 109405324 A CN109405324 A CN 109405324A CN 201811314566 A CN201811314566 A CN 201811314566A CN 109405324 A CN109405324 A CN 109405324A
- Authority
- CN
- China
- Prior art keywords
- evaporator
- valve
- defrosting
- pressure
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 63
- 238000001704 evaporation Methods 0.000 claims abstract description 87
- 238000010257 thawing Methods 0.000 claims abstract description 85
- 238000005057 refrigeration Methods 0.000 claims abstract description 38
- 230000008569 process Effects 0.000 claims abstract description 18
- 230000008676 import Effects 0.000 claims abstract description 12
- 230000006835 compression Effects 0.000 claims description 17
- 238000007906 compression Methods 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 11
- 230000008020 evaporation Effects 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims 1
- 239000003507 refrigerant Substances 0.000 description 9
- 238000004378 air conditioning Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Abstract
The present invention provides a kind of double evaporators air-conditioner sets, including A wind path air hose, B wind path air hose, refrigeration system, differential pressure pickup, blower, import blast main, outlet blast main, the first air-valve, the second air-valve, import blast main and outlet blast main are connected to air-supply desired region；Refrigeration system includes the first evaporator, the second evaporator, the first solenoid valve, second solenoid valve；First evaporator is arranged in A wind path air hose, and the second evaporator is arranged in B wind path air hose.The control method of the unit, comprising steps of control parameter is arranged in A.；B. refrigeration work is carried out according to the road A refrigerating state；When C. meeting switching condition, the road B refrigerating state is switched to by the road A refrigerating state；When D. meeting switching condition, the road A refrigerating state is switched to by the road B refrigerating state；E. spare evaporator defrosting is carried out in unit running process and operation evaporator evaporating pressure is adjusted.Cost is relatively low and leaving air temp is stablized for the unit and its control method.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to a kind of double evaporators air-conditioner set and its control method.
Background technique
In food fresh keeping, the places such as grain storage extend fresh keeping time to guarantee the freshness of food or grain, need
The cold air distribution technology of 0-5 degree range is realized using low-temperature refrigeration air conditioner, and the cold air distribution in this kind of place controls at present
In realization, cryogenic refrigerating system (evaporating temperature of cryogenic refrigerating system is usually less than 0 degree) the using and the reserved mode is generallyd use
It realizes, i.e., realizes the using and the reserved operation with two sets of duplicate cryogenic refrigerating systems, reach wherein a set of cryogenic refrigerating system
When long-time cold air distribution, which causes, causes the refrigeration system evaporator frosting ice to block up due to evaporating temperature is too low, it is switched to another standby
Refrigeration system operation, realizes the consecutive low temperature air blowing function of this kind of air-conditioning equipment.
Though and this method may be implemented to a certain extent this kind of air-conditioning equipment consecutive low temperature air-supply, there are still with
Lower problem:
1) the four big components i.e. evaporator, condenser for the refrigeration system that two sets of duplicate refrigeration systems are related to are (containing condensation
Blower), compressor and expansion valve, refrigeration pipeline etc. be two sets, it is at high cost, the cost base of two low-temperature air conditioners is bought with client
This is quite；
2) since the component that will originally belong to two low-temperature air conditioners is loaded in a low-temperature air conditioner, the air-conditioning is caused to occupy volume
Greatly, installation and transport difficulty increase；
3) this mode is usually to realize that evaporator melts using the heat exchange of itself and nature after the ice system of blocking up becomes back-up system
Frost, this defrosting mode is influenced by environmental temperature, and in the lower weather of environment temperature, defrosting process is slow, and puts into fortune
At low ambient temperatures, frosting progress faster often under low temperature environment capable cryogenic refrigerating system occurs, and backup cryogenic refrigeration system steams
Hair device frost has not melted, and operation cryogenic refrigerating system evaporator frosting is serious, eventually leads to two sets of equal nothings of cryogenic refrigerating system
The case where method is run occurs.
Summary of the invention
The purpose of the present invention is to provide a kind of double evaporators air-conditioner set and its control methods, it is intended to solve above-mentioned existing
At least one technical problem in technology.
In order to achieve the above object, this invention takes following technical schemes:
A kind of double evaporators air-conditioner set, including A wind path air hose, B wind path air hose, refrigeration system, 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, import blast main and
Outlet blast main is connected to air-supply desired region；Refrigeration system includes the first evaporator and the second evaporator, and is respectively used to
Control the first solenoid valve and second solenoid valve of the first evaporator and the opening and closing of the second evaporator；First evaporator is arranged in A wind path
In air hose, the second evaporator is arranged in B wind path air hose, and blower setting is in outlet blast main, and differential pressure pickup is for detecting
Differential pressure of atmospheric pressure between import blast main and outlet blast main；The first air-valve is respectively arranged in A wind path air hose and B wind path air hose
With the second air-valve.
In the double evaporators air-conditioner set, the refrigeration system further include sequentially connected evaporating pressure sensor,
Compressor, condenser, and the condensation fan at condenser is set；The outlet of first evaporator and the second evaporator is connected to
The inlet of evaporating pressure sensor, the entrance of the first evaporator are simultaneously connected to the first solenoid valve and the first by-passing valve, the second evaporation
The entrance of device is simultaneously connected to second solenoid valve and the second by-passing valve, and the entrance of the first solenoid valve and second solenoid valve is connected to condenser
Exit, the entrance of the first by-passing valve and the second by-passing valve is connected to the inlet of condenser；First evaporator and second steams
Temperature sensor is provided on hair device.
In the double evaporators air-conditioner set, the refrigeration system further includes being arranged at evaporating pressure sensor inlet
Gas-liquid separator, the low-voltage protective switch between evaporating pressure sensor and compressor is set, compressor is successively set on
High voltage protective switch and oil-liquid separator between condenser, and the liquid storage device at condensator outlet is set.
In the double evaporators air-conditioner set, temperature sensor is provided in the outlet blast main.
A kind of control method of double evaporators air-conditioner set, 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. double evaporators air-conditioner set carries out refrigeration work according to the road A refrigerating state；
C. judged using unit both ends pressure difference, unit evaporating pressure, when they meet switching condition, by A road system
Cold state switches to the road B refrigerating state；
D. judged using unit both ends pressure difference, unit evaporating pressure, when they meet switching condition, by B road system
Cold state switches to the road A refrigerating state；
E. it in unit running process, by controlling the opening and closing of by-passing valve, carries out spare evaporator defrosting and operation evaporator steams
Pressure is sent out to adjust.
In the control method, the control parameter includes pressure difference switching value, evaporating pressure reference value, A-B switching mark
Will, B-A switching mark, current operation evaporator mark, vacuumize maximum time, evacuated pressure value, defrosting terminate temperature, melt
White pressure value, defrosting compression force reference value.
In the step C and D of the control method, meeting one of following two condition is to meet switching condition:
1. unit both ends pressure difference of condition > pressure difference switching value；
2. unit evaporating pressure of condition < evaporating pressure reference value.
Control method according to claim 7, which is characterized in that in step C, the road A refrigerating state switches to B road system
The process of cold state includes:
C1. the first air-valve is closed, the second air-valve is opened；
C2. it keeps compressor not shut down, and closes the first solenoid valve；
If the C3. duration that unit evaporating pressure<evacuated pressure value or the first solenoid valve and second solenoid valve are turned off>it takes out
Vacuum maximum time opens second solenoid valve；
In step D, the process that the road B refrigerating state switches to the road A refrigerating state includes:
D1. the second air-valve is closed, the first air-valve is opened；
D2. it keeps compressor not shut down, and closes second solenoid valve；
If the D3. duration that unit evaporating pressure<evacuated pressure value or the first solenoid valve and second solenoid valve are turned off>it takes out
Vacuum maximum time opens the first solenoid valve.
In the step E of the control method, in addition to following situations, the first by-passing valve and the second by-passing valve is kept to close:
Situation 1. is then pressed when the first evaporator is operating status, the second evaporator is stand-by state and is not at handoff procedure
According to the opening and closing of following steps control by-passing valve:
If E1. evaporating temperature < defrosting of the second evaporator terminates temperature, the second by-passing valve is opened, until the second evaporator
Evaporating temperature > defrosting terminates+1 DEG C of temperature, closes the second by-passing valve；
If E2. unit evaporating pressure < defrosting pressure value, then open the first by-passing valve；If defrosting pressure value≤unit evaporating pressure
≤ defrosting pressure value+defrosting compression force reference value, then periodically open and close the first by-passing valve according to pre-set programs；If unit vapor pres- sure
Power > defrosting pressure value+defrosting compression force reference value, then close the first by-passing valve；
Situation 2. is then pressed when the second evaporator is operating status, the first evaporator is stand-by state and is not at handoff procedure
According to the opening and closing of following steps control by-passing valve:
If E3. evaporating temperature < defrosting of the first evaporator terminates temperature, the first by-passing valve is opened, until the first evaporator
Evaporating temperature > defrosting terminates+1 DEG C of temperature, closes the first by-passing valve；
If E4. unit evaporating pressure < defrosting pressure value, then open the second by-passing valve；If defrosting pressure value≤unit evaporating pressure
≤ defrosting pressure value+defrosting compression force reference value, then periodically open and close the second by-passing valve according to pre-set programs；If unit vapor pres- sure
Power > defrosting pressure value+defrosting compression force reference value, then close the second by-passing valve.
In the step E of the control method, the pre-set programs are as follows: the first by-passing valve or the second by-passing valve are with a period
The frequency of square wave is opened and closed, and when high level opens corresponding by-passing valve, and when low level closes corresponding by-passing valve, should
The period of square wave is fixed, and the duration of high and low level is adjustable.
The utility model has the advantages that
The present invention provides a kind of double evaporators air-conditioner set and its control method, tool is there are two evaporator in refrigeration system, and two
A evaporator is separately positioned in two air hoses, two air hoses can open and close respectively, it can be achieved that the rotation work of two evaporators and
Defrosting, and other equipment of refrigeration system only need a set of, cost is relatively low, occupies small volume, and installation and transport difficulty are lower.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of double evaporators air-conditioner set provided by the invention.
Fig. 2 is the structural schematic diagram of refrigeration system in double evaporators air-conditioner set 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.
Fig. 6 is the control stream of the first by-passing valve and the second by-passing valve in control method provided by the invention, when A-B switches
Cheng Tu.
Fig. 7 is the control stream of the first by-passing valve and the second by-passing valve in control method provided by the invention, when B-A switches
Cheng Tu.
Specific embodiment
The present invention provides a kind of double evaporators air-conditioner set and its control method, to make the purpose of the present invention, technical solution
And effect is clearer, clear, the present invention is described in more detail as follows in conjunction with drawings and embodiments.It should be appreciated that this
Place is described, and specific examples are only used to explain the present invention, is not intended to limit the present invention.
A kind of double evaporators air-conditioner set provided by the invention referring to FIG. 1-2, including A wind path air hose 1, B wind path air hose
2, refrigeration system 3, differential pressure pickup 4 and blower 5；A wind path air hose and B wind path air hose are connected in parallel in an import blast main
Between 6 and an outlet blast main 7, import blast main and outlet blast main are connected to air-supply desired region 90；Refrigeration system 3 is wrapped
The first evaporator 3.1 and the second evaporator 3.2 are included, and is respectively used to the of the first evaporator of control and the opening and closing of the second evaporator
One solenoid valve 3.3 and second solenoid valve 3.4；First evaporator is arranged in A wind path air hose, and the second evaporator is arranged in B wind path
In air hose, blower setting is in outlet blast main, and differential pressure pickup is for detecting between import blast main and outlet blast main
Differential pressure of atmospheric pressure；The first air-valve 8 and the second air-valve 9 are respectively arranged in A wind path air hose and B wind path air hose.
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, and each electrical equipment in unit is equal
It is electrically connected with the control system and they is controlled by control system and worked.
There are two evaporators, two evaporators to be separately positioned in two air hoses for tool in the refrigeration system of the air-conditioner set,
Two air hoses can open and close rotation work and defrosting, it can be achieved that two evaporators respectively, and other equipment of refrigeration system only need
Want a set of, cost is relatively low, occupies small volume, and installation and transport difficulty are lower.
Specifically, the refrigeration system 3 further includes sequentially connected evaporating pressure sensor 3.5, compressor 3.6, condensation
Device 3.7, and the condensation fan 3.8 at condenser is set；The outlet of first evaporator 3.1 and the second evaporator 3.2 simultaneously connects
In the inlet of evaporating pressure sensor, the entrance of the first evaporator is simultaneously connected to the first solenoid valve 3.3 and the first by-passing valve 3.9,
The entrance of second evaporator is simultaneously connected to second solenoid valve 3.4 and the second by-passing valve 3.10, the first solenoid valve and second solenoid valve
Entrance is connected to the exit of condenser, and the entrance of the first by-passing valve and the second by-passing valve is connected to the inlet of condenser；The
Temperature sensor 3.11 is provided on one evaporator and the second evaporator.Two temperature sensors 3.11 are respectively used to measurement
The evaporating temperature of one evaporator and the second evaporator.Evaporating pressure sensor 3.5 is for measuring unit evaporating pressure.
It may be implemented by the first solenoid valve of control and second solenoid valve opening and closing using the first evaporator refrigeration and utilize the
The switching of two evaporator refrigerations.First by-passing valve and the second by-passing valve are also solenoid valve, are named as by-passing valve herein and are intended merely to
Facilitate explanation, and when evaporator needs to carry out defrosting, openable corresponding by-passing valve, the high-temperature exhaust air of compressor output into
Enter evaporator progress defrosting, the drawbacks such as defrosting is high-efficient, and solution natural heat-exchange defrosting is influenced by ambient temperature improve switching
Reliability and success rate.In addition, when the evaporating pressure of refrigeration system is lower, openable corresponding by-passing valve, compressor
The high-temperature exhaust air of output enters the evaporator being currently running, and improving evaporating pressure ensures the safe and stable operation of compressor, also can
The frosting velocity of the evaporator is reduced, switching frequency is reduced, improves the stationarity of supply air temperature, the continuous-stable of system is maintained to transport
Row.
Further, the refrigeration system 3 further includes the gas-liquid separator that 3.5 inlet of evaporating pressure sensor is arranged in
3.12, the low-voltage protective switch 3.13 between evaporating pressure sensor and compressor 3.6 is set, be successively set on compressor and
High voltage protective switch 3.14 and oil-liquid separator 3.15 between condenser 3.7, and the liquid storage at condensator outlet is set
Device 3.16.These equipment are set, compressor can be protected, keep compressor operating more steady, guarantee refrigeration effect.
Preferably, temperature sensor 10 is provided in the outlet blast main 7.It can real-time monitoring by the temperature sensor
The actual temperature of air-supply can also adjust the control parameter of control unit work according to practical supply air temperature situation of change, realize
Optimum control.
See Fig. 3-7, for the double evaporators air-conditioner set, the present invention also provides a kind of double evaporators air-conditioner sets
Control method, 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.
Specifically, the control parameter include pressure difference switching value P0, evaporating pressure reference value PE1, A-B switching mark M0,
B-A switching mark M1, current operation evaporator mark M2, vacuumize maximum time Tmax, evacuated pressure value P1, defrosting terminate
Temperature T0, defrosting pressure value P 2, defrosting compression force reference value PD.
Pressure difference switching value P0: pressure difference P > P0 that differential pressure pickup detects, it indicates that the stifled degree of access ice is serious, needs to cut
It changes.
Evaporating pressure reference value PE1: unit evaporating pressure PE < PE1, it indicates that evaporating pressure is too low, shows access ice indirectly
Stifled degree is serious, needs to switch.
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 (abbreviation A-B handoff procedure) of state, M0 is set as 1 automatically by control program, at the end of the handoff procedure, controls program
Automatically M0 is set as 0；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 (abbreviation B-A handoff procedure) of state, M1 is set as 1 automatically by control program, at the end of the handoff procedure, controls program
Automatically M1 is set as 0；That is M1=1 indicates in B-A switching that M0=0 indicates B-A finishing switching.
Current operation evaporator mark M2:M2 only has M2=0 and the two states of M2=1, and operation evaporator is the first evaporator
M2 is set as 0 automatically by time control processing procedure sequence, and operation evaporator is that M2 is set as 1 automatically by the second evaporator time control processing procedure sequence.
Vacuumize maximum time Tmax: compressor extraction needs the maximum of the process of the coolant in the evaporator of defrosting to hold
The continuous time.
Evacuated pressure value P1: as unit evaporating pressure PE < P1, expression has needed the coolant in the evaporator of defrosting
It is completely drawn out.
Defrosting terminates temperature T0: measure evaporator whether the sufficient temperature value of defrosting.
Defrosting pressure value P 2 and defrosting compression force reference value PD: being that the high-temperature exhaust air of compressor is introduced operation evaporator
The control parameter of process.
B. double evaporators air-conditioner set carries 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, and the first solenoid valve is opened, and second solenoid valve is closed.Control program
A-B switching mark M0, B-A switching mark M1, current operation evaporator mark M2 setting are as follows: M0=0, M1=0, M2=0.
C. judged using unit both ends pressure difference P, unit evaporating pressure PE, when they meet 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 switching condition:
1. unit both ends pressure difference P of condition > pressure difference switching value P0；
2. unit evaporating pressure PE of condition < evaporating pressure reference value PE1.
See Fig. 4, after meeting switching condition, the road A refrigerating state switches to the process of the road B refrigerating state, and (abbreviation A-B switched
Journey) include:
C1. the first air-valve is closed, the second air-valve is opened；
Meanwhile controlling program and M0, M1, M2 are arranged are as follows: M0=1, M1=0, M2=1；When detecting M0=1, when M1=0, M2=1, into
Row step C2；
C2. it keeps compressor not shut down, and closes the first solenoid valve；
The purpose of this step is to extract out the refrigerant having in the first evaporator, and is stored in liquid storage device, avoids from cutting
After changing evaporator, the lack of refrigerant in the second evaporator causes compressor low pressure alarming and shuts down, and leads to handover failure；
If C3. unit evaporating pressure PE < evacuated pressure value P1 or the first solenoid valve and second solenoid valve be turned off it is lasting when
Between T > vacuumize maximum time Tmax, open second solenoid valve；
Meanwhile controlling program and M0, M1, M2 are arranged are as follows: M0=0, M1=0, M2=1, mark A-B handoff procedure terminate and enter the road B
Refrigerating state；
The purpose of this step is to judge whether refrigerant has been completely drawn out, the purpose of maximum evacuation time Tmax setting be as
Fruit evaporating pressure sensor failure then forces switching evaporator by time conditions, improves the reliability of switching.
D. judged using unit both ends pressure difference P, unit evaporating pressure PE, when they meet switching condition,
The road A refrigerating state is switched to by the road B refrigerating state.
Specifically, meeting one of following two condition is to meet switching condition:
1. unit both ends pressure difference P of condition > pressure difference switching value P0；
2. unit evaporating pressure PE of condition < evaporating pressure reference value PE1.
See Fig. 5, after meeting switching condition, the road B refrigerating state switches to process (the abbreviation B-A switching of the road A refrigerating state
Process) include:
D1. the second air-valve is closed, the first air-valve is opened；
Meanwhile controlling program and M0, M1, M2 are arranged are as follows: M0=0, M1=1, M2=0；When detecting M0=0, when M1=1, M2=0, into
Row step D2；
D2. it keeps compressor not shut down, and closes second solenoid valve；
The purpose of this step is to extract out the refrigerant having in the second evaporator, and is stored in liquid storage device, avoids from cutting
After changing evaporator, the lack of refrigerant in the first evaporator causes compressor low pressure alarming and shuts down, and leads to handover failure；
If D3. unit evaporating pressure PE < evacuated pressure value P1 or the first solenoid valve and second solenoid valve be turned off it is lasting when
Between T > vacuumize maximum time Tmax, open second solenoid valve；
Meanwhile controlling program and M0, M1, M2 are arranged are as follows: M0=0, M1=0, M2=0, mark B-A handoff procedure terminate and enter the road A
Refrigerating state；
The purpose of this step is to judge whether refrigerant has been completely drawn out, the purpose of maximum evacuation time Tmax setting be as
Fruit evaporating pressure sensor failure then forces switching evaporator by time conditions, improves the reliability of switching.
E. in unit running process, by controlling the opening and closing of by-passing valve, spare evaporator defrosting and operation evaporation are carried out
Device evaporating pressure is adjusted.
Specifically, keeping the first by-passing valve and the second by-passing valve to close in addition to following situations:
Situation 1. is when the first evaporator is operating status, the second evaporator is stand-by state and is not at handoff procedure (i.e. M0
=0, when M1=0, M2=0), then the opening and closing of by-passing valve is controlled according to the following steps:
If E1. evaporating temperature Tb < defrosting of the second evaporator terminates temperature T0, the second by-passing valve is opened, until the second evaporation
Evaporating temperature Tb > defrosting of device terminates T0+1 DEG C of temperature, closes the second by-passing valve；
The purpose of this step is to carry out defrosting to the second evaporator using the high-temperature exhaust air of compressor, until ensuring that defrosting is complete
Finish, enters operation next time for the second evaporator and carry out sufficient preparation；
If E2. unit evaporating pressure PE < defrosting pressure value P 2, then open the first by-passing valve；If defrosting pressure value≤unit evaporation
Pressure PE≤defrosting pressure value P 2+ defrosting compression force reference value PD, then periodically open and close the first by-passing valve according to pre-set programs；If
Unit evaporating pressure PE > defrosting pressure value P 2+ defrosting compression force reference value PD, then close the first by-passing valve；
The purpose of this step is when system evaporating pressure is higher, the first evaporator without using compressor high-temperature exhaust air into
Row defrosting is evaporated boost in pressure to the first evaporator using the high-temperature exhaust air of compressor when system evaporating pressure is lower,
Ensure the safe and stable operation of compressor.Meanwhile frosting velocity is reduced, switching frequency is reduced as much as possible, to avoid as far as possible
To the influence of fluctuations of low temperature leaving air temp when switching, system continuous and steady operation is maintained.
Situation 2. is that operating status, the first evaporator are stand-by state and are not at handoff procedure when the second evaporator
When M0=0, M1=0, M2=1 (i.e.) then controls the opening and closing of by-passing valve according to the following steps:
If E3. evaporating temperature Ta < defrosting of the first evaporator terminates temperature T0, the first by-passing valve is opened, until the first evaporation
Evaporating temperature Ta > defrosting of device terminates T0+1 DEG C of temperature, closes the first by-passing valve；
The purpose of this step is to carry out defrosting to the first evaporator using the high-temperature exhaust air of compressor, until ensuring that defrosting is complete
Finish, enters operation next time for the first evaporator and carry out sufficient preparation；
If E4. unit evaporating pressure PE < defrosting pressure value P 2, then open the second by-passing valve；If defrosting 2≤unit of pressure value P steams
Pressure PE≤defrosting pressure value P 2+ defrosting compression force reference value PD is sent out, then periodically opens and closes the second by-passing valve according to pre-set programs；
If unit evaporating pressure PE > defrosting pressure value P 2+ defrosting compression force reference value PD, closes the second by-passing valve；
The purpose of this step is when system evaporating pressure is higher, the second evaporator without using compressor high-temperature exhaust air into
Row defrosting is evaporated boost in pressure to the second evaporator using the high-temperature exhaust air of compressor when system evaporating pressure is lower,
Ensure the safe and stable operation of compressor.Meanwhile frosting velocity is reduced, switching frequency is reduced as much as possible, to avoid as far as possible
To the influence of fluctuations of low temperature leaving air temp when switching, system continuous and steady operation is maintained.
Specifically, in step E, the pre-set programs are as follows: the first by-passing valve or the second by-passing valve are with the frequency of a cycle square wave
Rate is opened and closed, and when high level opens corresponding by-passing valve, and when low level closes corresponding by-passing valve, the week of the square wave
Phase is fixed, and the duration of high and low level is adjustable.
The control method of above-mentioned steps E is, it can be achieved that spare evaporator defrosting and the promotion of operation evaporator evaporating pressure are protected
Relatively independent control is protected, is not interfere with each other, while realizing control purpose, improves the stability of control.
In conclusion the air-conditioner set has the advantage that
1) evaporator and corresponding solenoid valve are only increased on the basis of common air-conditioning unit, and two evaporations can be realized
The rotation work of device and defrosting, and other equipment of refrigeration system only need a set of, are with the complete refrigeration of two sets of the prior art
The scheme of system is compared, and cost is relatively low, occupies small volume, and installation and transport difficulty are lower；
2) high-temperature exhaust air of compressor is introduced by by-passing valve by spare evaporator and carries out defrosting, the abundant defrosting of evaporator can be made,
The drawbacks such as natural heat-exchange defrosting is influenced by ambient temperature are solved, the reliability and success rate of switching are improved；
3) by the way that the high-temperature exhaust air of compressor is introduced operation evaporator by by-passing valve, evaporating pressure is adjusted, it is ensured that compressor
Safe and stable operation, meanwhile, reduce frosting velocity, as much as possible reduction switching frequency, thus avoid as far as possible switching when to low
The influence of fluctuations of warm leaving air temp maintains system continuous and steady operation, and realizes that leaving air temp is stablized；
4) when being evaporated device switching, first refrigerant is extracted out from the evaporator before switching, it is ensured that refrigerant, which does not remain on, to be cut
Evaporator before changing, the evaporator refrigerant after avoiding switching is insufficient and hair the case where cause refrigeration system low pressure alarming to be shut down
It is raw.
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 evaporators air-conditioner set, which is characterized in that passed including A wind path air hose, B wind path air hose, refrigeration system, pressure difference
Sensor and blower；A wind path air hose and B wind path air hose be connected in parallel in an import blast main and outlet blast main it
Between, import blast main and outlet blast main are connected to air-supply desired region；Refrigeration system includes the first evaporator and the second evaporation
Device, and it is respectively used to the first solenoid valve and second solenoid valve of the first evaporator of control and the opening and closing of the second evaporator；First steams
It sends out device to be arranged in A wind path air hose, the second evaporator is arranged in B wind path air hose, and blower setting is in outlet blast main, pressure difference
Sensor is used to detect import blast main and exports the differential pressure of atmospheric pressure between blast main；In A wind path air hose and B wind path air hose respectively
It is provided with the first air-valve and the second air-valve.
2. double evaporators air-conditioner set according to claim 1, which is characterized in that the refrigeration system further includes successively connecting
Evaporating pressure sensor, compressor, the condenser connect, and the condensation fan at condenser is set；First evaporator and
The outlet of two evaporators is connected to the inlet of evaporating pressure sensor, the entrance of the first evaporator and be connected to the first solenoid valve and
First by-passing valve, the entrance of the second evaporator are simultaneously connected to second solenoid valve and the second by-passing valve, the first solenoid valve and the second electromagnetism
The entrance of valve is connected to the exit of condenser, and the entrance of the first by-passing valve and the second by-passing valve is connected to the entrance of condenser
Place；Temperature sensor is provided on first evaporator and the second evaporator.
3. double evaporators air-conditioner set according to claim 2, which is characterized in that the refrigeration system further includes that setting exists
Gas-liquid separator at evaporating pressure sensor inlet, the low-voltage variation being arranged between evaporating pressure sensor 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 evaporators air-conditioner set according to claim 1, which is characterized in that be provided with temperature in the outlet blast main
Spend sensor.
5. a kind of control method of double evaporators air-conditioner set, which comprises 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. double evaporators air-conditioner set carries out refrigeration work according to the road A refrigerating state；
C. judged using unit both ends pressure difference, unit evaporating pressure, when they meet switching condition, by A road system
Cold state switches to the road B refrigerating state；
D. judged using unit both ends pressure difference, unit evaporating pressure, when they meet switching condition, by B road system
Cold state switches to the road A refrigerating state；
E. it in unit running process, by controlling the opening and closing of by-passing valve, carries out spare evaporator defrosting and operation evaporator steams
Pressure is sent out to adjust.
6. control method according to claim 5, which is characterized in that the control parameter includes pressure difference switching value, evaporation
Compression force reference value, B-A switching mark, current operation evaporator mark, vacuumizes maximum time, vacuumizes pressure A-B switching mark
Force value, defrosting terminate temperature, defrosting pressure value, defrosting compression force reference value.
7. control method according to claim 6, which is characterized in that in step C and D, meet one of following two condition
As meet switching condition:
1. unit both ends pressure difference of condition > pressure difference switching value；
2. unit evaporating pressure of condition < evaporating pressure reference value.
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:
C1. the first air-valve is closed, the second air-valve is opened；
C2. it keeps compressor not shut down, and closes the first solenoid valve；
If the C3. duration that unit evaporating pressure<evacuated pressure value or the first solenoid valve and second solenoid valve are turned off>it takes out
Vacuum maximum time opens second solenoid valve；
In step D, the process that the road B refrigerating state switches to the road A refrigerating state includes:
D1. the second air-valve is closed, the first air-valve is opened；
D2. it keeps compressor not shut down, and closes second solenoid valve；
If the D3. duration that unit evaporating pressure<evacuated pressure value or the first solenoid valve and second solenoid valve are turned off>it takes out
Vacuum maximum time opens the first solenoid valve.
9. control method according to claim 5, which is characterized in that in step E, in addition to following situations, keep by the of first
Port valve and the second by-passing valve are closed:
Situation 1. is then pressed when the first evaporator is operating status, the second evaporator is stand-by state and is not at handoff procedure
According to the opening and closing of following steps control by-passing valve:
If E1. evaporating temperature < defrosting of the second evaporator terminates temperature, the second by-passing valve is opened, until the second evaporator
Evaporating temperature > defrosting terminates+1 DEG C of temperature, closes the second by-passing valve；
If E2. unit evaporating pressure < defrosting pressure value, then open the first by-passing valve；If defrosting pressure value≤unit evaporating pressure
≤ defrosting pressure value+defrosting compression force reference value, then periodically open and close the first by-passing valve according to pre-set programs；If unit vapor pres- sure
Power > defrosting pressure value+defrosting compression force reference value, then close the first by-passing valve；
Situation 2. is then pressed when the second evaporator is operating status, the first evaporator is stand-by state and is not at handoff procedure
According to the opening and closing of following steps control by-passing valve:
If E3. evaporating temperature < defrosting of the first evaporator terminates temperature, the first by-passing valve is opened, until the first evaporator
Evaporating temperature > defrosting terminates+1 DEG C of temperature, closes the first by-passing valve；
If E4. unit evaporating pressure < defrosting pressure value, then open the second by-passing valve；If defrosting pressure value≤unit evaporating pressure
≤ defrosting pressure value+defrosting compression force reference value, then periodically open and close the second by-passing valve according to pre-set programs；If unit vapor pres- sure
Power > defrosting pressure value+defrosting compression force reference value, then close the second by-passing valve.
10. control method according to claim 9, which is characterized in that in step E, the pre-set programs are as follows: the first bypass
Valve or the second by-passing valve are opened and closed with the frequency of a cycle square wave, and when high level opens corresponding by-passing valve, low electricity
Corresponding by-passing valve is usually closed, the period of the square wave is fixed, and the duration of high and low level is adjustable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811314566.6A CN109405324B (en) | 2018-11-06 | 2018-11-06 | Double-evaporator air conditioning unit and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811314566.6A CN109405324B (en) | 2018-11-06 | 2018-11-06 | Double-evaporator air conditioning unit and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109405324A true CN109405324A (en) | 2019-03-01 |
| CN109405324B CN109405324B (en) | 2023-08-15 |
Family
ID=65471938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811314566.6A Active CN109405324B (en) | 2018-11-06 | 2018-11-06 | Double-evaporator air conditioning unit and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109405324B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110789301A (en) * | 2019-11-21 | 2020-02-14 | 奇瑞汽车股份有限公司 | Double-evaporator air conditioning system and matching method thereof |
| CN111055863A (en) * | 2019-10-18 | 2020-04-24 | 石家庄国祥运输设备有限公司 | Low-voltage protection method for air conditioning unit of railway vehicle |
| CN111219852A (en) * | 2020-01-10 | 2020-06-02 | 宁波奥克斯电气股份有限公司 | Defrosting method and device, air conditioner and storage medium |
| CN114646127A (en) * | 2022-04-19 | 2022-06-21 | 青岛海信日立空调系统有限公司 | Air conditioning system and refrigerant circulation abnormity detection method |
| WO2022134530A1 (en) * | 2020-12-25 | 2022-06-30 | 青岛海尔空调器有限总公司 | Control method and device for dual-evaporator air conditioner and dual-evaporator air conditioner |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204202231U (en) * | 2014-09-12 | 2015-03-11 | 江苏辛普森新能源有限公司 | A kind of double evaporators air source heat pump |
| CN204880911U (en) * | 2015-08-28 | 2015-12-16 | 合肥美菱股份有限公司 | White system of automation of forced air cooling refrigerator |
| CN106705298A (en) * | 2016-12-23 | 2017-05-24 | 南通华信中央空调有限公司 | Multi-connection type fresh air conditioner unit with exhaust air heat pump heat recovery function and heat exchange method |
| CN106907877A (en) * | 2017-03-10 | 2017-06-30 | 南京理工大学 | A kind of double evaporators replace defrosting net for air-source heat pump units and its Defrost method |
| CN207600009U (en) * | 2017-11-29 | 2018-07-10 | 天津商业大学 | A kind of folding type cooling system of freezer with hot gas defrosting |
| CN209116573U (en) * | 2018-11-06 | 2019-07-16 | 广东建设职业技术学院 | A kind of double evaporators air-conditioner set |
-
2018
- 2018-11-06 CN CN201811314566.6A patent/CN109405324B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204202231U (en) * | 2014-09-12 | 2015-03-11 | 江苏辛普森新能源有限公司 | A kind of double evaporators air source heat pump |
| CN204880911U (en) * | 2015-08-28 | 2015-12-16 | 合肥美菱股份有限公司 | White system of automation of forced air cooling refrigerator |
| CN106705298A (en) * | 2016-12-23 | 2017-05-24 | 南通华信中央空调有限公司 | Multi-connection type fresh air conditioner unit with exhaust air heat pump heat recovery function and heat exchange method |
| CN106907877A (en) * | 2017-03-10 | 2017-06-30 | 南京理工大学 | A kind of double evaporators replace defrosting net for air-source heat pump units and its Defrost method |
| CN207600009U (en) * | 2017-11-29 | 2018-07-10 | 天津商业大学 | A kind of folding type cooling system of freezer with hot gas defrosting |
| CN209116573U (en) * | 2018-11-06 | 2019-07-16 | 广东建设职业技术学院 | A kind of double evaporators air-conditioner set |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111055863A (en) * | 2019-10-18 | 2020-04-24 | 石家庄国祥运输设备有限公司 | Low-voltage protection method for air conditioning unit of railway vehicle |
| CN111055863B (en) * | 2019-10-18 | 2021-02-23 | 石家庄国祥运输设备有限公司 | Low-voltage protection method for air conditioning unit of railway vehicle |
| CN110789301A (en) * | 2019-11-21 | 2020-02-14 | 奇瑞汽车股份有限公司 | Double-evaporator air conditioning system and matching method thereof |
| CN110789301B (en) * | 2019-11-21 | 2021-02-02 | 奇瑞汽车股份有限公司 | Double-evaporator air conditioning system and matching method thereof |
| CN111219852A (en) * | 2020-01-10 | 2020-06-02 | 宁波奥克斯电气股份有限公司 | Defrosting method and device, air conditioner and storage medium |
| WO2022134530A1 (en) * | 2020-12-25 | 2022-06-30 | 青岛海尔空调器有限总公司 | Control method and device for dual-evaporator air conditioner and dual-evaporator air conditioner |
| CN114646127A (en) * | 2022-04-19 | 2022-06-21 | 青岛海信日立空调系统有限公司 | Air conditioning system and refrigerant circulation abnormity detection method |
| CN114646127B (en) * | 2022-04-19 | 2023-09-19 | 青岛海信日立空调系统有限公司 | Air conditioning system and refrigerant circulation abnormality detection method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109405324B (en) | 2023-08-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109405324A (en) | A kind of double evaporators air-conditioner set and its control method | |
| CN106958926B (en) | Air conditioner and defrosting control method thereof | |
| KR100821728B1 (en) | Air conditioning system | |
| JPH0799297B2 (en) | Air conditioner | |
| CN112283993B (en) | Refrigeration control method and device and refrigeration equipment | |
| CN112797593A (en) | Self-cleaning control method and single-cooling type air conditioner | |
| CN107044756A (en) | The anti-freeze control method of air door and refrigerator | |
| CN107228522A (en) | The control method of wind cooling refrigerator | |
| CN108759257A (en) | A kind of indoor self-circulating defrosting rule of wind cooling refrigerator | |
| CN109405101B (en) | Double-air-path central air conditioning unit and control method thereof | |
| CN109059395A (en) | The control method of refrigerator and refrigerator | |
| CN104864679A (en) | Natural defrosting method for air-cooled refrigerator | |
| CN206973766U (en) | A kind of frostless low temperature dehumidification machine of hot-gas bypass | |
| JPH0933146A (en) | Defroster for air conditioner and control method thereof | |
| JP4622901B2 (en) | Air conditioner | |
| CN209116573U (en) | A kind of double evaporators air-conditioner set | |
| CN113587510B (en) | Evaporator defrost control method for cooling system, computer readable storage medium | |
| JP2001004254A (en) | Refrigeration system | |
| CN110486996A (en) | Utilize the defrosting structure and Defrost method of compression case body heat content | |
| CN110411055A (en) | A kind of air-conditioning system and its control method with defrosting device | |
| JPH0730979B2 (en) | Air conditioner | |
| JP2523534B2 (en) | Air conditioner | |
| CN114440400B (en) | Air conditioner control method and device and air conditioner | |
| CN218120283U (en) | Refrigerating unit | |
| JPH0141105Y2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20230717 Address after: No. 638, Guanghua 2nd Road, Baiyun District, Guangzhou City, Guangdong Province, 510440 Applicant after: GUANGDONG CONSTRUCTION VOCATIONAL TECHNOLOGY INSTITUTE Applicant after: Shenzhen Kangsida Automation Technology Co.,Ltd. Address before: No. 638, Guanghua 2nd Road, Baiyun District, Guangzhou City, Guangdong Province, 510440 Applicant before: GUANGDONG CONSTRUCTION VOCATIONAL TECHNOLOGY INSTITUTE |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20231019 Address after: 401, 411, AVIC building, No.7, Langshan Road, North District, Science Park, Nanshan District, Shenzhen, Guangdong 518000 Patentee after: Shenzhen Kangsida Automation Technology Co.,Ltd. Address before: No. 638, Guanghua 2nd Road, Baiyun District, Guangzhou City, Guangdong Province, 510440 Patentee before: GUANGDONG CONSTRUCTION VOCATIONAL TECHNOLOGY INSTITUTE Patentee before: Shenzhen Kangsida Automation Technology Co.,Ltd. |