CN112797570A - Defrosting control method, defrosting device and multi-connected air conditioning system - Google Patents
Defrosting control method, defrosting device and multi-connected air conditioning system Download PDFInfo
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- CN112797570A CN112797570A CN202011626432.5A CN202011626432A CN112797570A CN 112797570 A CN112797570 A CN 112797570A CN 202011626432 A CN202011626432 A CN 202011626432A CN 112797570 A CN112797570 A CN 112797570A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- 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
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- 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
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- 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
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- Air Conditioning Control Device (AREA)
- Defrosting Systems (AREA)
Abstract
The invention relates to the technical field of air conditioners, in particular to a defrosting control method, a defrosting device and a multi-connected air conditioning system. The defrosting control method comprises the following steps: acquiring the current running state and the accumulated running time of the inner fan; judging the state of the room where the inner fan is located according to the current operation state and the accumulated operation time of the inner fan; the room state of the inner fan comprises a normal use room, a common room and an uncommon room; and controlling the opening degree of the electronic expansion valve and/or the operation parameters of the inner fan according to the state of the room where the inner fan is located. The technical problem that the defrosting period consumes long time is solved.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a defrosting control method, a defrosting device and a multi-connected air conditioning system.
Background
When the air conditioner operates and heats in winter, because of low evaporation temperature, when the temperature is lower than dew point temperature and lower than 0 ℃, the outdoor heat exchanger can frost after long-time operation, the efficiency of the heat exchanger is influenced, and therefore defrosting is needed in time when frosting is detected.
When the existing air conditioner is in defrosting operation, the four-way valve is reversed, and a high-temperature and high-pressure refrigerant of the outdoor unit enters the outdoor unit to release heat and defrost, and then is throttled to evaporate and absorb heat in the indoor unit; the minimum temperature of the indoor fan during defrosting can reach-30 ℃, and in order to avoid cold air blowing, comfort is guaranteed, and the indoor fan is in a closed state during defrosting. Therefore, the indoor evaporation heat exchange is natural convection heat exchange, the absorbed heat is less, and the defrosting period is long in time consumption.
Disclosure of Invention
The invention solves the technical problem that the defrosting cycle consumes long time in the existing air conditioning system.
In order to solve the above problems, a first object of the present invention is to provide a defrosting control method applied to a multiple on-line system, including the steps of:
acquiring the current running state and the accumulated running time of the inner fan;
judging the state of the room where the inner fan is located according to the current operation state and the accumulated operation time of the inner fan; the room state of the inner fan comprises a normal use room, a common room and an uncommon room;
and determining the opening degree of the electronic expansion valve and/or the operation parameters of the internal fan according to the state of the room where the internal fan is located.
When the air conditioning system detects that the defrosting condition is met, the system enters defrosting operation, the current operation state and the accumulated operation time length of the inner fan are obtained, the room state of the inner fan is judged according to the current operation state and the accumulated operation time length, the room state is respectively a normal use room, a common room and an uncommon room, and the opening degree of the electronic expansion valve and/or the operation parameters of the inner fan are/is determined according to the corresponding room state. The invention finely divides the room state of the inner fan, and respectively controls the inner fans according to the specific state of the room of each inner fan, thereby effectively utilizing the heat of the common room and the uncommon room to defrost without influencing the use comfort of the air conditioner corresponding to the normal use room.
Further, the state of the room where the inner fan is located is judged according to the current starting state and the accumulated running time of the inner fan; the room state of the inner fan comprises the steps of a normal use room, a common room and an uncommon room:
when the current running state of the inner fan is a starting state, judging that the room state of the inner fan is a normal use room;
when the current running state of the inner fan is a shutdown state and the accumulated startup time is a predetermined time, determining that the room state of the inner fan is a common room;
and when the current running state of the inner fan is a shutdown state, the accumulated startup time is less than the preset time, and the actual startup frequency is less than the preset startup frequency, judging that the room state where the inner fan is located is an uncommon room.
The room state of the inner fan is divided according to the current running state of the inner fan and the accumulated starting time, and the room state of the inner fan can be divided reasonably and finely, so that fine defrosting control is realized.
Further, when the current operating state of the internal fan is a shutdown state and the accumulated startup duration is a predetermined duration, determining that the room state where the internal fan is located is a common room, includes:
acquiring the temperature difference between the return air inlet temperature of the inner fan and the indoor environment temperature;
judging the waste heat state of the common room according to the temperature difference between the return air inlet temperature of the inner fan and the indoor environment temperature; the waste heat state of the common room comprises a poor waste heat state and a rich waste heat state.
According to the temperature difference between the return air inlet temperature of the inner fan and the indoor environment temperature, the common room is divided into refined room states, and refined defrosting control can be achieved.
Further, the determining the waste heat state of the common room according to the temperature difference between the temperature of the return air inlet of the inner fan and the indoor environment temperature comprises:
when the difference value between the temperature of the air return inlet of the inner fan and the indoor environment temperature is not larger than a first preset temperature difference, judging that the common room is a poor residual heat room;
and when the difference value between the temperature of the return air inlet of the inner fan and the indoor environment temperature is not less than a second preset temperature difference, judging that the common room is a room with surplus heat.
And refining the room state division of the common room again according to the difference value of the return air inlet temperature of the inner fan and the indoor environment temperature, wherein the division basis is reasonable.
Further, the determining the opening degree of the electronic expansion valve and/or the operation parameters of the internal fan according to the state of the room where the internal fan is located includes:
when the room where the inner fan is located is the common room and the room with surplus heat, during defrosting, determining the opening degree of the electronic expansion valve to be a first opening degree, and determining the gear of the inner fan to be a first gear;
and when the room where the inner fan is located is the common room and the poor residual heat room, determining the opening degree of the electronic expansion valve as a second opening degree and determining that the inner fan is in a closed state during defrosting.
For a common room, the heat in the room with surplus heat can be fully utilized by controlling the heat utilization device in the way, and the state of the room with poor surplus heat is not influenced, so that reasonable heat utilization is realized.
Further, the determining the opening degree of the electronic expansion valve and/or the operation parameters of the internal fan according to the state of the room where the internal fan is located includes:
when the room where the inner fan is located is in an uncommon room, during defrosting, determining the opening degree of the electronic expansion valve as a third opening degree, and determining the gear of the inner fan as a third gear;
and when the room where the inner fan is located is a normal use room, determining the opening degree of the electronic expansion valve as a fourth opening degree during defrosting, and determining that the inner fan is in a closed state.
The heat utilization control method has the advantages that the heat in the unusual rooms can be fully utilized, the use state of the normal use rooms is not influenced, and accordingly reasonable heat utilization is achieved.
Furthermore, the first gear and the third gear are both micro wind gears, so that the control is simple;
and/or the angle of the air guide sheet of the inner fan is at the minimum angle, so that the influence on the comfort caused by the direct blowing of cold air to a user can be avoided.
Further, the method also comprises the following steps:
acquiring an actual temperature difference value between the return air inlet temperature of the inner fan and the maximum value of the outdoor environment temperature;
and judging whether the actual temperature difference between the return air inlet temperature of the inner fan and the maximum value of the outdoor environment temperature is less than or equal to a preset temperature difference, if so, determining that the inner fan is in a closed state.
By the arrangement, heat in the corresponding room can be effectively utilized, and the use comfort of the corresponding room is prevented from being influenced.
Further, the method also comprises the following steps:
acquiring a suction temperature difference and a discharge temperature difference, wherein the suction temperature difference is a temperature difference between the suction temperature and the low-pressure saturation temperature of the compressor, and the discharge temperature difference is a temperature difference between the discharge temperature and the high-pressure saturation temperature of the compressor;
judging whether the temperature difference of breathing in is less than the preset temperature difference of breathing in, whether the temperature difference of exhausting is less than the preset temperature difference of exhausting, just whether the temperature difference of exhausting has the trend that diminishes, if, then judge that the compressor has the risk of returning liquid, the interior fan that control not common room and/or ordinary room correspond opens gentle breeze shelves and moves to defrosting and end.
So set up, can effectively improve the heat transfer volume of compressor evaporation side, ensure that low temperature low pressure liquid refrigerant evaporates completely, avoid liquid to flow back to the compressor to avoid the emergence of liquid attack risk.
A second object of the present invention is to provide a defrosting apparatus for a multi-connected air conditioner, which is applied to a multi-connected system, and includes:
the acquiring unit is used for acquiring the current running state and the accumulated running time of the inner fan;
the judging unit is used for judging the state of the room where the inner fan is located according to the current running state and the accumulated running time of the inner fan; the room state of the inner fan comprises a normal use room, a common room and an uncommon room;
and the control unit is used for determining the opening of the electronic expansion valve and/or the operation parameters of the inner fan according to the state of the room where the inner fan is located.
When the air conditioning system detects that the defrosting condition is met, the system enters defrosting operation, the current operation state and the accumulated operation time length of the inner fan are obtained, the room state of the inner fan is judged according to the current operation state and the accumulated operation time length, the room state is respectively a normal use room, a common room and an uncommon room, and the opening degree of the electronic expansion valve and/or the operation parameters of the inner fan are/is determined according to the corresponding room state. The invention finely divides the room state of the inner fan, and respectively controls the inner fans according to the specific state of the room of each inner fan, thereby effectively utilizing the heat of the common room and the uncommon room to defrost without influencing the use comfort of the air conditioner corresponding to the common room.
A third object of the present invention is to provide a multi-connected air conditioning system, which includes a computer readable storage medium storing a computer program and a processor, wherein the computer program is read by the processor and executed by the processor, so as to implement the above-mentioned defrosting control method. The multi-connected air conditioning system has all the advantages of the defrosting control method, and the detailed description is omitted.
A fourth object of the present invention is to provide a computer-readable storage medium storing a computer program which, when read and executed by a processor, implements the above-described defrost control method. The computer readable storage medium has all the advantages of the above-described defrost control method, which will not be described herein.
Drawings
FIG. 1 is a schematic flow chart of a defrost control method according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a procedure of determining a state of a room in which an internal air blower is located according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a procedure of determining that a room where an internal fan is located is a common room in the embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating steps for determining operating parameters of the electronic expansion valve and the internal fan according to the state of the room where the internal fan is located in the embodiment of the present invention;
FIG. 5 is a schematic diagram of a cutoff condition for residual heat defrosting according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating a compressor backflow determination and liquid impact avoidance risk control method according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The embodiment provides a defrosting control method applied to a multi-split system, as shown in fig. 1, including the steps of:
s102, acquiring the current running state and the accumulated running time of the inner fan;
s104, judging the state of the room where the inner fan is located according to the current operation state and the accumulated operation time of the inner fan; the room state of the inner fan comprises a normal use room, a common room and an uncommon room;
s106, according to the state of the room where the inner fan is located, the opening of the electronic expansion valve and the operation parameters of the inner fan are determined.
In the embodiment of the invention, the current operation state and the accumulated operation time length of the inner fan are obtained, the room state of the inner fan is judged according to the current operation state and the accumulated operation time length, the room state is respectively a normal use room, a common room and an uncommon room, and the opening of the electronic expansion valve and the operation parameters of the inner fan are determined according to the corresponding room state. According to the defrosting control method, the states of the rooms in which the inner fans are located are finely divided, so that the rooms in which the inner fans are located can be respectively controlled according to the specific states of the rooms in which the inner fans are located, the heat of a common room and an uncommon room can be effectively utilized to defrost, the using comfortableness of an air conditioner corresponding to a room in which the air conditioner is normally used is not affected, and compared with the prior art, the defrosting control method provided by the embodiment of the invention fully utilizes the idle heat, so that the defrosting can be rapidly performed, and the defrosting period is effectively shortened.
It should be noted that, in step S104, the electronic expansion valve or the internal fan operating parameter may be determined separately according to the state of the internal fan, so as to achieve the function of accelerating defrosting.
Specifically, in the present embodiment, in the step of determining the room state of the internal air blower according to the current on state and the accumulated operating time of the internal air blower, as shown in fig. 2, the following determination is performed:
s202, when the current running state of the inner fan is the starting state, judging that the room where the inner fan is located is a normal use room;
s204, when the current running state of the inner fan is a shutdown state and the accumulated startup time is a predetermined time, determining that the room state of the inner fan is a common room;
s206, when the current running state of the internal fan is a shutdown state, the accumulated startup time is less than the preset time, and the actual startup frequency is less than the preset startup frequency, the room state of the internal fan is judged to be an uncommon room.
The room state of the inner fan is divided according to the current running state of the inner fan and the accumulated starting time, and the room state of the inner fan can be divided reasonably and finely, so that fine defrosting control is realized. For example, the heat of the ordinary room or the unusual room can be used for defrosting independently, and the heat of the ordinary room and the unusual room can be used for defrosting simultaneously, so that the use comfort of a user in a normal use room is not influenced. Not only can defrost quickly, but also has the function of energy conservation.
In this embodiment, when the current operating state of the internal air blower is a shutdown state and the accumulated startup duration is a predetermined duration, it is determined that the room state where the internal air blower is located is a common room, as shown in fig. 3, the method includes:
s302, acquiring a temperature difference between the return air inlet temperature of the inner fan and the indoor environment temperature;
s304, judging the waste heat state of the common room according to the temperature difference between the return air inlet temperature of the inner fan and the indoor environment temperature; the waste heat state of the common room includes a poor waste heat state and a rich waste heat state.
S306, when the difference value between the return air inlet temperature of the inner fan and the indoor environment temperature is not larger than a first preset temperature difference, determining that the common room is a poor residual heat room;
s308, when the difference value between the return air inlet temperature of the inner fan and the indoor environment temperature is not smaller than the second preset temperature difference, the common room is judged to be a room with surplus heat.
According to the temperature difference between the return air inlet temperature of the inner fan and the indoor environment temperature, the common room is divided into refined room states, refined defrosting control can be achieved, and the division basis is reasonable. Compared with an uncommon room and a normal use room, the use condition of a common room is not very clear, or the randomness is relatively high, the common room can be a room with surplus heat or a room with poor surplus heat, and the room can be used at any time.
In this embodiment, the determining the opening of the electronic expansion valve and the operating parameters of the internal fan according to the state of the room where the internal fan is located as shown in fig. 4 includes:
s402, when the room where the inner fan is located is a common room and is a room with surplus heat, during defrosting, determining the opening degree of the electronic expansion valve to be a first opening degree, and determining the gear of the inner fan to be a first gear;
s404, when the room where the inner fan is located is a common room and is a poor residual heat room, during defrosting, determining the opening degree of the electronic expansion valve to be a second opening degree, and determining the inner fan to be in a closed state.
S406, when the room where the inner fan is located is in an uncommon room, during defrosting, determining the opening degree of the electronic expansion valve to be a third opening degree, and determining the gear of the inner fan to be a third gear;
s408, when the room where the inner fan is located is a normal use room, during defrosting, the opening degree of the electronic expansion valve is determined to be the fourth opening degree, and the inner fan is determined to be in a closed state.
It should be noted that, the above is to control the opening of the electronic expansion valve and the operation parameters of the internal fan at the same time, and in the actual operation process, the electronic expansion valve or the operation parameters of the internal fan may be controlled separately.
For a common room, the heat in the room with surplus heat can be fully utilized by controlling the heat utilization device in the way, and the state of the room with poor surplus heat is not influenced, so that reasonable heat utilization is realized. The heat utilization control method has the advantages that the heat in the unusual rooms can be fully utilized, the use state of the normal use rooms is not influenced, and accordingly reasonable heat utilization is achieved.
Specifically, the first opening degree, the second opening degree and the third opening degree may be the same or different, so that the control is simple; in general, the fourth opening degree of the electronic expansion valve corresponding to the normal use room is smaller than the opening degree of the electronic expansion valve corresponding to the normal use room and the unusual use room. First gear can be the same with the third gear, and is the gentle shelves of wind, so set up to have the advantage that control is simple.
In this embodiment, the guide vane angle of interior fan is located minimum angle, can avoid cold wind direct-blowing user, and influence the travelling comfort.
In this embodiment, as shown in fig. 5, the method further includes the steps of:
s502, acquiring an actual temperature difference value between the return air inlet temperature of the inner fan and the maximum value of the outdoor environment temperature;
s504, whether the actual temperature difference value between the return air inlet temperature of the inner fan and the maximum value of the outdoor environment temperature is smaller than or equal to the preset temperature difference or not is judged, and if yes, the inner fan is determined to be in a closed state.
By the arrangement, heat in the corresponding room can be effectively utilized, and the use comfort of the corresponding room is prevented from being influenced. In addition, in the defrosting process, the residual heat of the corresponding room is gradually reduced, and the residual heat is not suitable for continuously providing heat for defrosting after being reduced to a certain degree. The step solves the problem, and is used for cutting off defrosting and heat supply in time so as to ensure the use comfort of the corresponding room.
In this embodiment, as shown in fig. 6, the method further includes the steps of:
s602, acquiring a suction temperature difference and a discharge temperature difference, wherein the suction temperature difference is a temperature difference between the suction temperature and the low-pressure saturation temperature of the compressor, and the discharge temperature difference is a temperature difference between the discharge temperature and the high-pressure saturation temperature of the compressor;
s604, judging whether the air suction temperature difference is smaller than the air suction preset temperature difference, whether the air exhaust temperature difference is smaller than the air exhaust preset temperature difference, and whether the air exhaust temperature difference has a diminishing trend, if so, judging that the compressor has a liquid return risk, and determining that the inner fans corresponding to the uncommon room and the common room start a micro air gear to operate until defrosting is finished. In the step, the micro-wind gear can be started by respectively determining the internal fans corresponding to the uncommon rooms or the common rooms until defrosting is finished. Of course, if conditions allow, the unusual room and the ordinary room are determined at the same time, the remaining heat is more sufficient, and defrosting is more rapid.
When the air suction temperature difference is smaller than the air suction preset temperature difference, the superheat degree of the evaporation side of the compressor is insufficient, the low-temperature low-pressure liquid refrigerant is not completely evaporated, and part of liquid is stored back to the compressor, so that the liquid impact risk is easily caused. When the exhaust temperature difference is smaller than the preset exhaust temperature difference and the exhaust temperature difference has a tendency of becoming small, the fact that the oil temperature superheat degree of the compressor is insufficient and is in an accelerated reduction state is indicated, and the oil temperature superheat degree is insufficient, so that the activity of lubricating oil is influenced, and the abrasion risk of the compressor is easily caused. When these risk early warnings appear, through control unusual room, ordinary room for the defrosting provides the waste heat, so set up, can effectively improve the heat transfer volume of compressor evaporation side, ensure that low temperature low pressure liquid refrigerant evaporates completely, avoid liquid to flow back to the compressor to avoid the emergence of liquid attack risk.
The following is a more intuitive description of the present invention and embodiments thereof, with reference to specific parameters.
1) And judging the state of the room where the inner fan is located according to the current running state and the accumulated running time of the inner fan.
Firstly, when the running state of the current inner fan is a starting state, marking as a normal use room;
when a hours are continued, t1If the accumulated running time is less than or equal to a and the current running state of the inner fan is a shutdown state, marking the running state as a common room; according to the furred ceiling layer temperature in room and the difference of settlement temperature, divide once more, in this example, regard as furred ceiling layer temperature in room with fan return air inlet temperature, the line controller temperature is as the settlement temperature, specifically as follows:
i when the temperature of the air return inlet of the inner fan-the temperature of the linear controller is less than delta t1If so, marking as a poor residual heat room;
II when the temperature of the air return inlet of the inner fan-the temperature of the linear controller is less than delta t2Then, the room is marked as a hot room.
③ when a hours are continuous, the accumulated running time is less than t1And the current running state of the inner fan isAnd in the power-off state, the room is marked as an uncommon room.
Wherein, the value range of a is as follows: 2-8 h, preferably: 4 h; t is t1The value range is as follows: 0-2 h, preferably 1 h; Δ t1The value range is as follows: 0-5 h, preferably 2 h; Δ t2The value range is as follows: 3-8 h, preferably 5 h.
2) And determining the operation parameters of the electronic expansion valve and the fan according to the state of the room where the internal machine is located, as follows.
During defrosting, the opening degree of the electronic expansion valve is P for an uncommon room1The gear of the inner fan is switched to a breeze gear, and the air guide sheet is adjusted to the minimum angle. The infrequent use of the room is generally considered to be unattended, and at this point the room temperature drops without compromising comfort, so both the electronic expansion valve and the damper are open.
When the temperature of the return air inlet of the inner fan is equal to the outdoor environment temperaturemax≤d1I.e. inner fan return air inlet temperature- (outdoor ambient temperature-d)1)maxWhen the air flow is less than or equal to 0, the inner fan is turned off from a gentle air gear; this is because, namely, the inner fan return air inlet temperature- (outdoor ambient temperature-d)1)maxWhen the temperature is less than or equal to 0, the indoor temperature is lower than the outdoor environment temperature d1Degree, if blow this moment, have the sensation of blowing cold wind, influence the travelling comfort, so the fan is closed.
Secondly, in the defrosting period, aiming at the common room and the room with surplus heat, the opening degree of the electronic expansion valve is P1The gear of the inner fan is switched to a breeze gear, and the air guide sheet is adjusted to the minimum angle. For a common room, no person is in the room, the room temperature is high for the surplus heat, and heat waste can be generated if the surplus heat is not sufficiently beneficial, so that the heat of the surplus heat room can be properly utilized without affecting comfort by opening the electronic expansion valve and the wind shield during defrosting.
When the temperature of the return air inlet of the inner fan is equal to the outdoor environment temperaturemax≤d2I.e. inner fan return air temperature- (outdoor ambient temperature-d)2)maxWhen the air flow is less than or equal to 0, the inner fan is adjusted to be closed from a breeze gear; this is because, when the inner fan return air temperature is- (outdoor ambient temperature-d)2)maxWhen the temperature is less than or equal to 0, the indoor temperature of the room is lower than the outdoor environment temperature d2Degree, if blow this moment, have the sensation of blowing cold wind, influence the travelling comfort, so the fan is closed.
During defrosting, the opening degree of the electronic expansion valve is P for a common room and a room with poor residual heat1The inner fan is closed; it is possible that the room is not occupied (the requirement is not high), but the room temperature is low, and during defrosting, if the wind shield is opened, the room temperature is lower, and the risk of complaint exists.
During defrosting, the opening degree of the electronic expansion valve is P for a common room2And the inner fan is closed. For a normal use room, it is indicated that the room is in use, and the room temperature preferably does not drop, so the fan is turned off. However, the electronic expansion valve must be opened to a certain opening degree P2This is to prevent the air conditioning system from accumulating the refrigerant oil and the refrigerant.
Wherein, P1The value range is as follows: 150-300 pls, preferably: 200 pls; p2The value range is as follows: 60-150 pls, preferably: 100 pls; d1Is constant, and the value range is as follows: 5-10 ℃; d2Is constant, and the value range is as follows: 3-8 ℃; outdoor ambient temperaturemaxFor the maximum outdoor ambient temperature, one can use (outdoor ambient temperature-d)1) And (outdoor ambient temperature-d)2) Defined as the relative temperature of the outdoor environment, (outdoor ambient temperature-d)1)maxAnd (outdoor ambient temperature-d)2)maxIs the maximum relative temperature of the outdoor environment.
In the defrosting period, the opening P of the electronic expansion valve corresponding to the room with surplus heat and the room with poor surplus heat is set for the ordinary room1P corresponding to the room with surplus heat1P corresponding to poor residual heat room1Of course, the opening degrees of both may be the same. Furthermore, P1＞P2，P1The opening degree is large, so that refrigeration and heat absorption are ensured for defrosting; p2The small opening ensures that the refrigerant oil passes through and does not store the refrigerant.
For the division of a normally used room, a common room and an uncommon room, the aim of the method can be to ensure that the use comfort level of the normally used room is not influenced as much as possible during the defrosting period; for an uncommon room, the heat exchange amount during defrosting is improved and the defrosting time is shortened by controlling the wind shield during defrosting, so that the use comfort of the room in normal use is ensured; the use scene of the common room is not clear, so when the room temperature is detected to be high enough, the windshield is controlled, and the comfort of the normal use room or the common room is ensured.
3) Whether the air conditioning system has liquid return or not is detected, and the following control is carried out to avoid the occurrence of liquid impact risks.
During defrosting, when the following is detected for 30 seconds continuously: d (n) inspiratory temperature-low pressure saturation temperature < c1The superheat degree of the evaporation side is insufficient, the low-temperature and low-pressure liquid refrigerant is not completely evaporated, and part of liquid is stored back to the compressor to cause liquid impact risk; and D (n) is exhaust temperature-high pressure saturation temperature < c2And when D (n-1) -D (n) is more than E, the superheat degree of the oil temperature of the compressor is insufficient, the compressor is in an accelerated reduction process, and the superheat degree of the oil temperature is insufficient, so that the activity of lubricating oil is influenced, and the wear risk of the compressor is caused; when the colleagues meet the conditions, the high risk of liquid return is marked, at the moment, the internal fans of the unusual rooms and the common rooms are started to a gentle wind gear until defrosting is finished, and meanwhile, the air guide plates are adjusted to the minimum angle. By the arrangement, the heat exchange quantity of the evaporation side can be improved, the low-temperature and low-pressure liquid refrigerant is ensured to be completely evaporated, and the refrigerant is prevented from returning to the compressor; meanwhile, the air guide angle is adjusted to be minimum, so that cold air can be prevented from blowing people, and the comfort is prevented from being influenced.
Wherein d (n) is the difference in the suction temperature, c1A predetermined temperature difference for air suction, c1Is constant, and the value range is as follows: 0-3 ℃, preferably: 1 deg.C; d (n) is the temperature difference of exhaust gas, c2A predetermined temperature difference for exhaust gas, c2Is constant, and the value range is as follows: 5-20 ℃, preferably: 5-10 ℃, more preferably: 10 ℃; d (n-1) is the last exhaust temperature difference, and D (n) is the current exhaust temperature difference; e is a constant, and the value range is as follows: 0-10 ℃, preferably: 3 ℃ is adopted. The client use condition and the sensor installation position of the priority value range are determined, the numerical values of different scenes are different, so the range is selected, and the optimal value is setIn order to achieve an acceptable maximum load capacity without compromising comfort, reliability, etc.
In conclusion, the defrosting control method provided by the embodiment can effectively utilize the heat of an idle room to defrost during defrosting, so that the defrosting speed is increased, and meanwhile, the room fan and the electronic expansion valve are normally used for reasonable control, so that the use comfort of the air conditioner is ensured, and the liquid return reliability of the system is ensured.
A second object of the present invention is to provide a defrosting apparatus for a multi-connected air conditioner, which is applied to a multi-connected system, and includes:
the acquisition unit is used for acquiring the current running state and the accumulated running time of the inner fan;
the judging unit is used for judging the state of the room where the inner fan is located according to the current running state and the accumulated running time of the inner fan; the room state of the inner fan comprises a normal use room, a common room and an uncommon room;
and the control unit is used for determining the opening of the electronic expansion valve and/or the operation parameters of the inner fan according to the state of the room where the inner fan is located.
When the air conditioning system detects that the defrosting condition is met, the system enters defrosting operation, the current operation state and the accumulated operation time length of the inner fan are obtained, the room state of the inner fan is judged according to the current operation state and the accumulated operation time length, the room state is respectively a normal use room, a common room and an uncommon room, and the opening degree of the electronic expansion valve and/or the operation parameters of the inner fan are/is determined according to the corresponding room state. The invention finely divides the room state of the inner fan, and respectively controls the inner fans according to the specific state of the room of each inner fan, thereby effectively utilizing the heat of the common room and the uncommon room to defrost without influencing the use comfort of the air conditioner corresponding to the normal use room.
A third object of the present invention is to provide a multi-connected air conditioning system, which includes a computer readable storage medium storing a computer program and a processor, wherein the computer program is read by the processor and executed by the processor, and the defrosting control method is described above. The multi-connected air conditioning system has all the advantages of the defrosting control method, and the detailed description is omitted.
A fourth object of the present invention is to provide a computer-readable storage medium storing a computer program which, when read and executed by a processor, implements the above-described defrost control method. The computer readable storage medium has all the advantages of the above-described defrost control method, which will not be described herein.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. A defrosting control method is applied to a multi-split air conditioning system and comprises the following steps:
acquiring the current running state and the accumulated running time of the inner fan;
judging the state of the room where the inner fan is located according to the current operation state and the accumulated operation time of the inner fan; the room state of the inner fan comprises a normal use room, a common room and an uncommon room;
and determining the opening degree of the electronic expansion valve and/or the operation parameters of the internal fan according to the state of the room where the internal fan is located.
2. The defrost control method of claim 1,
judging the state of the room where the inner fan is located according to the current starting state and the accumulated running time of the inner fan; the room state of the inner fan comprises the steps of a normal use room, a common room and an uncommon room, and the method comprises the following steps:
when the current running state of the inner fan is a starting state, judging that the room state of the inner fan is a normal use room;
when the current running state of the inner fan is a shutdown state and the accumulated startup time is a predetermined time, determining that the room state of the inner fan is a common room;
and when the current running state of the inner fan is a shutdown state, the accumulated startup time is less than the preset time, and the actual startup frequency is less than the preset startup frequency, judging that the room state where the inner fan is located is an uncommon room.
3. The defrost control method of claim 2,
when the current running state of the inner fan is a shutdown state and the accumulated startup duration is a predetermined duration, the state of the room where the inner fan is located is determined to be a common room, and the method comprises the following steps:
acquiring the temperature difference between the return air inlet temperature of the inner fan and the indoor environment temperature;
judging the waste heat state of the common room according to the temperature difference between the return air inlet temperature of the inner fan and the indoor environment temperature; the waste heat state of the common room comprises a poor waste heat state and a rich waste heat state.
4. The defrost control method of claim 3,
according to the temperature difference between the temperature of the air return inlet of the inner fan and the indoor environment temperature, the waste heat state of the common room is judged, and the method comprises the following steps:
when the difference value between the temperature of the air return inlet of the inner fan and the indoor environment temperature is not larger than a first preset temperature difference, judging that the common room is a poor residual heat room;
and when the difference value between the temperature of the return air inlet of the inner fan and the indoor environment temperature is not less than a second preset temperature difference, judging that the common room is a room with surplus heat.
5. The defrost control method of claim 4,
the determining of the opening degree of the electronic expansion valve and/or the operation parameters of the internal fan according to the state of the room where the internal fan is located comprises the following steps:
when the room where the inner fan is located is the common room and the room with surplus heat, during defrosting, determining the opening degree of the electronic expansion valve to be a first opening degree, and determining the gear of the inner fan to be a first gear;
and when the room where the inner fan is located is the common room and the poor residual heat room, determining the opening degree of the electronic expansion valve as a second opening degree and determining that the inner fan is in a closed state during defrosting.
6. The defrost control method of claim 5,
the determining of the opening degree of the electronic expansion valve and/or the operation parameters of the internal fan according to the state of the room where the internal fan is located comprises the following steps:
when the room where the inner fan is located is in an uncommon room, during defrosting, determining the opening degree of the electronic expansion valve as a third opening degree, and determining the gear of the inner fan as a third gear;
and when the room where the inner fan is located is a normal use room, determining the opening degree of the electronic expansion valve as a fourth opening degree during defrosting, and determining that the inner fan is in a closed state.
7. The defrost control method of claim 6,
the first gear and the third gear are both breeze gears;
and/or the angle of the wind guide plate of the inner fan is positioned at the minimum angle.
8. The defrost control method of claim 6 or 7, further comprising the steps of:
acquiring an actual temperature difference value between the return air inlet temperature of the inner fan and the maximum value of the relative temperature of the outdoor environment;
and judging whether the actual temperature difference between the return air inlet temperature of the inner fan and the maximum value of the outdoor environment temperature is less than or equal to a preset temperature difference, if so, determining that the inner fan is in a closed state.
9. The defrost control method of claim 6 or 7, further comprising the steps of:
acquiring a suction temperature difference and a discharge temperature difference, wherein the suction temperature difference is a temperature difference between the suction temperature and the low-pressure saturation temperature of the compressor, and the discharge temperature difference is a temperature difference between the discharge temperature and the high-pressure saturation temperature of the compressor;
judging whether the air suction temperature difference is smaller than the air suction preset temperature difference or not, judging whether the air exhaust temperature difference is smaller than the air exhaust preset temperature difference or not, judging whether the air exhaust temperature difference has a diminishing trend or not, if so, judging that the compressor has a liquid return risk, and determining that an inner fan corresponding to an uncommon room and/or a common room starts a breeze shift to run to the end of defrosting.
10. The utility model provides a defroster which characterized in that, is applied to many online system, includes:
the acquiring unit is used for acquiring the current running state and the accumulated running time of the inner fan;
the judging unit is used for judging the state of the room where the inner fan is located according to the current running state and the accumulated running time of the inner fan; the room state of the inner fan comprises a normal use room, a common room and an uncommon room;
and the control unit is used for determining the opening of the electronic expansion valve and/or the operation parameters of the inner fan according to the state of the room where the inner fan is located.
11. A multi-connected air conditioning system comprising a computer-readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the defrost control method according to any one of claims 1-9.
12. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the defrost control method according to any of claims 1-9.
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Effective date of registration: 20221021 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee after: NINGBO AUX ELECTRIC Co.,Ltd. Patentee after: AUX AIR CONDITIONING LIMITED BY SHARE Ltd. Address before: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Patentee before: NINGBO AUX ELECTRIC Co.,Ltd. Patentee before: Ningbo Oxfam intelligent commercial air conditioning manufacturing Co.,Ltd. |